projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Linux 3.19-rc1
[deliverable/linux.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 157 u8 attached_count;
b4df4636 158 u8 child_count;
4be44fcd 159 struct acpi_video_bus_cap cap;
1da177e4 160 struct acpi_video_bus_flags flags;
4be44fcd 161 struct list_head video_device_list;
bbac81f5 162 struct mutex device_list_lock; /* protects video_device_list */
67b662e1 163 struct list_head entry;
e9dab196
LY		 164 struct input_dev *input;
165 char phys[32]; /* for input device */
ac7729da 166 struct notifier_block pm_nb;
53a92ba7 167 struct notifier_block backlight_nb;
1da177e4
LT		 168};
169
170struct acpi_video_device_flags {
4be44fcd
LB		 171 u8 crt:1;
172 u8 lcd:1;
173 u8 tvout:1;
82cae999 174 u8 dvi:1;
4be44fcd
LB		 175 u8 bios:1;
176 u8 unknown:1;
91e13aa3
AL		 177 u8 notify:1;
178 u8 reserved:1;
1da177e4
LT		 179};
180
181struct acpi_video_device_cap {
21fcb34e
FC		 182 u8 _ADR:1; /* Return the unique ID */
183 u8 _BCL:1; /* Query list of brightness control levels supported */
184 u8 _BCM:1; /* Set the brightness level */
2f3d000a 185 u8 _BQC:1; /* Get current brightness level */
c60d638e 186 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
21fcb34e 187 u8 _DDC:1; /* Return the EDID for this device */
1da177e4
LT		 188};
189
d32f6947
ZR		 190struct acpi_video_brightness_flags {
191 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
21fcb34e 192 u8 _BCL_reversed:1; /* _BCL package is in a reversed order */
1a7c618a 193 u8 _BQC_use_index:1; /* _BQC returns an index value */
d32f6947
ZR		 194};
195
1da177e4 196struct acpi_video_device_brightness {
4be44fcd
LB		 197 int curr;
198 int count;
199 int *levels;
d32f6947 200 struct acpi_video_brightness_flags flags;
1da177e4
LT		 201};
202
203struct acpi_video_device {
4be44fcd
LB		 204 unsigned long device_id;
205 struct acpi_video_device_flags flags;
206 struct acpi_video_device_cap cap;
207 struct list_head entry;
8ab58e8e
LT		 208 struct delayed_work switch_brightness_work;
209 int switch_brightness_event;
4be44fcd
LB		 210 struct acpi_video_bus *video;
211 struct acpi_device *dev;
1da177e4 212 struct acpi_video_device_brightness *brightness;
2f3d000a 213 struct backlight_device *backlight;
4a703a8f 214 struct thermal_cooling_device *cooling_dev;
1da177e4
LT		 215};
216
b7171ae7 217static const char device_decode[][30] = {
1da177e4
LT		 218 "motherboard VGA device",
219 "PCI VGA device",
220 "AGP VGA device",
221 "UNKNOWN",
222};
223
4be44fcd
LB		 224static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
225static void acpi_video_device_rebind(struct acpi_video_bus *video);
226static void acpi_video_device_bind(struct acpi_video_bus *video,
227 struct acpi_video_device *device);
1da177e4 228static int acpi_video_device_enumerate(struct acpi_video_bus *video);
2f3d000a
YL		 229static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
230 int level);
231static int acpi_video_device_lcd_get_level_current(
232 struct acpi_video_device *device,
a89803df 233 unsigned long long *level, bool raw);
4be44fcd
LB		 234static int acpi_video_get_next_level(struct acpi_video_device *device,
235 u32 level_current, u32 event);
8ab58e8e 236static void acpi_video_switch_brightness(struct work_struct *work);
1da177e4 237
0e9f81d3
AL		 238static bool acpi_video_use_native_backlight(void)
239{
240 if (use_native_backlight_param != -1)
241 return use_native_backlight_param;
242 else
243 return use_native_backlight_dmi;
244}
245
0b9f7d93 246bool acpi_video_verify_backlight_support(void)
fbc9fe1b 247{
0e9f81d3 248 if (acpi_osi_is_win8() && acpi_video_use_native_backlight() &&
fbc9fe1b
AL		 249 backlight_device_registered(BACKLIGHT_RAW))
250 return false;
251 return acpi_video_backlight_support();
252}
0b9f7d93 253EXPORT_SYMBOL_GPL(acpi_video_verify_backlight_support);
fbc9fe1b 254
21fcb34e 255/* backlight device sysfs support */
2f3d000a
YL		 256static int acpi_video_get_brightness(struct backlight_device *bd)
257{
27663c58 258 unsigned long long cur_level;
38531e6f 259 int i;
7c364e79 260 struct acpi_video_device *vd = bl_get_data(bd);
c8890f90 261
a89803df 262 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
c8890f90 263 return -EINVAL;
38531e6f
MG		 264 for (i = 2; i < vd->brightness->count; i++) {
265 if (vd->brightness->levels[i] == cur_level)
21fcb34e
FC		 266 /*
267 * The first two entries are special - see page 575
268 * of the ACPI spec 3.0
269 */
915ea7e4 270 return i - 2;
38531e6f
MG		 271 }
272 return 0;
2f3d000a
YL		 273}
274
275static int acpi_video_set_brightness(struct backlight_device *bd)
276{
24450c7a 277 int request_level = bd->props.brightness + 2;
7c364e79 278 struct acpi_video_device *vd = bl_get_data(bd);
24450c7a 279
8ab58e8e 280 cancel_delayed_work(&vd->switch_brightness_work);
24450c7a
ZR		 281 return acpi_video_device_lcd_set_level(vd,
282 vd->brightness->levels[request_level]);
2f3d000a
YL		 283}
284
acc2472e 285static const struct backlight_ops acpi_backlight_ops = {
599a52d1
RP		 286 .get_brightness = acpi_video_get_brightness,
287 .update_status = acpi_video_set_brightness,
288};
289
702ed512 290/* thermal cooling device callbacks */
4a703a8f 291static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
6503e5df 292 long *state)
702ed512 293{
4a703a8f 294 struct acpi_device *device = cooling_dev->devdata;
702ed512
ZR		 295 struct acpi_video_device *video = acpi_driver_data(device);
296
6503e5df
MG		 297 *state = video->brightness->count - 3;
298 return 0;
702ed512
ZR		 299}
300
4a703a8f 301static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
6503e5df 302 long *state)
702ed512 303{
4a703a8f 304 struct acpi_device *device = cooling_dev->devdata;
702ed512 305 struct acpi_video_device *video = acpi_driver_data(device);
27663c58 306 unsigned long long level;
6503e5df 307 int offset;
702ed512 308
a89803df 309 if (acpi_video_device_lcd_get_level_current(video, &level, false))
c8890f90 310 return -EINVAL;
6503e5df
MG		 311 for (offset = 2; offset < video->brightness->count; offset++)
312 if (level == video->brightness->levels[offset]) {
313 *state = video->brightness->count - offset - 1;
314 return 0;
315 }
702ed512
ZR		 316
317 return -EINVAL;
318}
319
320static int
4a703a8f 321video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
702ed512 322{
4a703a8f 323 struct acpi_device *device = cooling_dev->devdata;
702ed512
ZR		 324 struct acpi_video_device *video = acpi_driver_data(device);
325 int level;
326
915ea7e4 327 if (state >= video->brightness->count - 2)
702ed512
ZR		 328 return -EINVAL;
329
330 state = video->brightness->count - state;
915ea7e4 331 level = video->brightness->levels[state - 1];
702ed512
ZR		 332 return acpi_video_device_lcd_set_level(video, level);
333}
334
9c8b04be 335static const struct thermal_cooling_device_ops video_cooling_ops = {
702ed512
ZR		 336 .get_max_state = video_get_max_state,
337 .get_cur_state = video_get_cur_state,
338 .set_cur_state = video_set_cur_state,
339};
340
21fcb34e
FC		 341/*
342 * --------------------------------------------------------------------------
343 * Video Management
344 * --------------------------------------------------------------------------
345 */
1da177e4 346
1da177e4 347static int
4be44fcd
LB		 348acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
349 union acpi_object **levels)
1da177e4 350{
4be44fcd
LB		 351 int status;
352 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
353 union acpi_object *obj;
1da177e4 354
1da177e4
LT		 355
356 *levels = NULL;
357
90130268 358 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
1da177e4 359 if (!ACPI_SUCCESS(status))
d550d98d 360 return status;
4be44fcd 361 obj = (union acpi_object *)buffer.pointer;
6665bda7 362 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
6468463a 363 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
1da177e4
LT		 364 status = -EFAULT;
365 goto err;
366 }
367
368 *levels = obj;
369
d550d98d 370 return 0;
1da177e4 371
915ea7e4 372err:
6044ec88 373 kfree(buffer.pointer);
1da177e4 374
d550d98d 375 return status;
1da177e4
LT		 376}
377
378static int
4be44fcd 379acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
1da177e4 380{
24450c7a 381 int status;
9e6dada9 382 int state;
1da177e4 383
0db98202
JL		 384 status = acpi_execute_simple_method(device->dev->handle,
385 "_BCM", level);
24450c7a
ZR		 386 if (ACPI_FAILURE(status)) {
387 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
388 return -EIO;
389 }
390
4500ca8e 391 device->brightness->curr = level;
9e6dada9 392 for (state = 2; state < device->brightness->count; state++)
24450c7a 393 if (level == device->brightness->levels[state]) {
1a7c618a
ZR		 394 if (device->backlight)
395 device->backlight->props.brightness = state - 2;
24450c7a
ZR		 396 return 0;
397 }
9e6dada9 398
24450c7a
ZR		 399 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
400 return -EINVAL;
1da177e4
LT		 401}
402
45cb50e6
ZR		 403/*
404 * For some buggy _BQC methods, we need to add a constant value to
405 * the _BQC return value to get the actual current brightness level
406 */
407
408static int bqc_offset_aml_bug_workaround;
409static int __init video_set_bqc_offset(const struct dmi_system_id *d)
410{
411 bqc_offset_aml_bug_workaround = 9;
412 return 0;
413}
414
5f24079b
HG		 415static int __init video_disable_native_backlight(const struct dmi_system_id *d)
416{
417 use_native_backlight_dmi = false;
418 return 0;
419}
420
45cb50e6
ZR		 421static struct dmi_system_id video_dmi_table[] __initdata = {
422 /*
423 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
424 */
425 {
426 .callback = video_set_bqc_offset,
427 .ident = "Acer Aspire 5720",
428 .matches = {
429 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
430 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
431 },
432 },
5afc4abe
LB		 433 {
434 .callback = video_set_bqc_offset,
435 .ident = "Acer Aspire 5710Z",
436 .matches = {
437 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
438 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
439 },
440 },
34ac272b
ZR		 441 {
442 .callback = video_set_bqc_offset,
443 .ident = "eMachines E510",
444 .matches = {
445 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
446 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
447 },
448 },
93bcece2
ZR		 449 {
450 .callback = video_set_bqc_offset,
451 .ident = "Acer Aspire 5315",
452 .matches = {
453 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
454 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
455 },
456 },
152a4e63
ZR		 457 {
458 .callback = video_set_bqc_offset,
459 .ident = "Acer Aspire 7720",
460 .matches = {
461 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
462 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
463 },
464 },
5f24079b
HG		 465
466 /*
467 * These models have a working acpi_video backlight control, and using
468 * native backlight causes a regression where backlight does not work
469 * when userspace is not handling brightness key events. Disable
470 * native_backlight on these to fix this:
471 * https://bugzilla.kernel.org/show_bug.cgi?id=81691
472 */
473 {
474 .callback = video_disable_native_backlight,
475 .ident = "ThinkPad T420",
476 .matches = {
477 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
478 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
479 },
480 },
481 {
482 .callback = video_disable_native_backlight,
483 .ident = "ThinkPad T520",
484 .matches = {
485 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
486 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
487 },
488 },
789eeea1
AL		 489 {
490 .callback = video_disable_native_backlight,
491 .ident = "ThinkPad X201s",
492 .matches = {
493 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
494 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
495 },
496 },
84c34858
HG		 497
498 /* The native backlight controls do not work on some older machines */
499 {
500 /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
501 .callback = video_disable_native_backlight,
502 .ident = "HP ENVY 15 Notebook",
503 .matches = {
504 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
505 DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
506 },
507 },
45cb50e6
ZR		 508 {}
509};
510
994fa63c
DB		 511static unsigned long long
512acpi_video_bqc_value_to_level(struct acpi_video_device *device,
513 unsigned long long bqc_value)
514{
515 unsigned long long level;
516
517 if (device->brightness->flags._BQC_use_index) {
518 /*
519 * _BQC returns an index that doesn't account for
520 * the first 2 items with special meaning, so we need
521 * to compensate for that by offsetting ourselves
522 */
523 if (device->brightness->flags._BCL_reversed)
524 bqc_value = device->brightness->count - 3 - bqc_value;
525
526 level = device->brightness->levels[bqc_value + 2];
527 } else {
528 level = bqc_value;
529 }
530
531 level += bqc_offset_aml_bug_workaround;
532
533 return level;
534}
535
1da177e4 536static int
4be44fcd 537acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
a89803df 538 unsigned long long *level, bool raw)
1da177e4 539{
c8890f90 540 acpi_status status = AE_OK;
4e231fa4 541 int i;
c8890f90 542
c60d638e
ZR		 543 if (device->cap._BQC || device->cap._BCQ) {
544 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
545
546 status = acpi_evaluate_integer(device->dev->handle, buf,
c8890f90
ZR		 547 NULL, level);
548 if (ACPI_SUCCESS(status)) {
a89803df
DB		 549 if (raw) {
550 /*
551 * Caller has indicated he wants the raw
552 * value returned by _BQC, so don't furtherly
553 * mess with the value.
554 */
555 return 0;
556 }
557
994fa63c 558 *level = acpi_video_bqc_value_to_level(device, *level);
1a7c618a 559
4e231fa4
VS		 560 for (i = 2; i < device->brightness->count; i++)
561 if (device->brightness->levels[i] == *level) {
562 device->brightness->curr = *level;
563 return 0;
915ea7e4 564 }
a89803df
DB		 565 /*
566 * BQC returned an invalid level.
567 * Stop using it.
568 */
569 ACPI_WARNING((AE_INFO,
570 "%s returned an invalid level",
571 buf));
572 device->cap._BQC = device->cap._BCQ = 0;
c8890f90 573 } else {
21fcb34e
FC		 574 /*
575 * Fixme:
c8890f90
ZR		 576 * should we return an error or ignore this failure?
577 * dev->brightness->curr is a cached value which stores
578 * the correct current backlight level in most cases.
579 * ACPI video backlight still works w/ buggy _BQC.
580 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
581 */
c60d638e
ZR		 582 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
583 device->cap._BQC = device->cap._BCQ = 0;
c8890f90
ZR		 584 }
585 }
586
4500ca8e 587 *level = device->brightness->curr;
c8890f90 588 return 0;
1da177e4
LT		 589}
590
591static int
4be44fcd
LB		 592acpi_video_device_EDID(struct acpi_video_device *device,
593 union acpi_object **edid, ssize_t length)
1da177e4 594{
4be44fcd
LB		 595 int status;
596 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
597 union acpi_object *obj;
598 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
599 struct acpi_object_list args = { 1, &arg0 };
1da177e4 600
1da177e4
LT		 601
602 *edid = NULL;
603
604 if (!device)
d550d98d 605 return -ENODEV;
1da177e4
LT		 606 if (length == 128)
607 arg0.integer.value = 1;
608 else if (length == 256)
609 arg0.integer.value = 2;
610 else
d550d98d 611 return -EINVAL;
1da177e4 612
90130268 613 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
1da177e4 614 if (ACPI_FAILURE(status))
d550d98d 615 return -ENODEV;
1da177e4 616
50dd0969 617 obj = buffer.pointer;
1da177e4
LT		 618
619 if (obj && obj->type == ACPI_TYPE_BUFFER)
620 *edid = obj;
621 else {
6468463a 622 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
1da177e4
LT		 623 status = -EFAULT;
624 kfree(obj);
625 }
626
d550d98d 627 return status;
1da177e4
LT		 628}
629
1da177e4
LT		 630/* bus */
631
1da177e4
LT		 632/*
633 * Arg:
21fcb34e
FC		 634 * video : video bus device pointer
635 * bios_flag :
1da177e4
LT		 636 * 0. The system BIOS should NOT automatically switch(toggle)
637 * the active display output.
638 * 1. The system BIOS should automatically switch (toggle) the
98fb8fe1 639 * active display output. No switch event.
1da177e4
LT		 640 * 2. The _DGS value should be locked.
641 * 3. The system BIOS should not automatically switch (toggle) the
642 * active display output, but instead generate the display switch
643 * event notify code.
644 * lcd_flag :
645 * 0. The system BIOS should automatically control the brightness level
98fb8fe1 646 * of the LCD when the power changes from AC to DC
21fcb34e 647 * 1. The system BIOS should NOT automatically control the brightness
98fb8fe1 648 * level of the LCD when the power changes from AC to DC.
21fcb34e 649 * Return Value:
ea9f8856 650 * -EINVAL wrong arg.
1da177e4
LT		 651 */
652
653static int
4be44fcd 654acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
1da177e4 655{
ea9f8856 656 acpi_status status;
1da177e4 657
b0373843
ZR		 658 if (!video->cap._DOS)
659 return 0;
1da177e4 660
ea9f8856
IM		 661 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
662 return -EINVAL;
0db98202
JL		 663 video->dos_setting = (lcd_flag << 2) | bios_flag;
664 status = acpi_execute_simple_method(video->device->handle, "_DOS",
665 (lcd_flag << 2) | bios_flag);
ea9f8856
IM		 666 if (ACPI_FAILURE(status))
667 return -EIO;
1da177e4 668
ea9f8856 669 return 0;
1da177e4
LT		 670}
671
935e5f29
ZR		 672/*
673 * Simple comparison function used to sort backlight levels.
674 */
675
676static int
677acpi_video_cmp_level(const void *a, const void *b)
678{
679 return *(int *)a - *(int *)b;
680}
681
a50188da
AL		 682/*
683 * Decides if _BQC/_BCQ for this system is usable
684 *
685 * We do this by changing the level first and then read out the current
686 * brightness level, if the value does not match, find out if it is using
687 * index. If not, clear the _BQC/_BCQ capability.
688 */
689static int acpi_video_bqc_quirk(struct acpi_video_device *device,
690 int max_level, int current_level)
691{
692 struct acpi_video_device_brightness *br = device->brightness;
693 int result;
694 unsigned long long level;
695 int test_level;
696
697 /* don't mess with existing known broken systems */
698 if (bqc_offset_aml_bug_workaround)
699 return 0;
700
701 /*
702 * Some systems always report current brightness level as maximum
703 * through _BQC, we need to test another value for them.
704 */
b3b301c5 705 test_level = current_level == max_level ? br->levels[3] : max_level;
a50188da
AL		 706
707 result = acpi_video_device_lcd_set_level(device, test_level);
708 if (result)
709 return result;
710
711 result = acpi_video_device_lcd_get_level_current(device, &level, true);
712 if (result)
713 return result;
714
715 if (level != test_level) {
716 /* buggy _BQC found, need to find out if it uses index */
717 if (level < br->count) {
718 if (br->flags._BCL_reversed)
719 level = br->count - 3 - level;
720 if (br->levels[level + 2] == test_level)
721 br->flags._BQC_use_index = 1;
722 }
723
724 if (!br->flags._BQC_use_index)
725 device->cap._BQC = device->cap._BCQ = 0;
726 }
727
728 return 0;
729}
730
731
1da177e4 732/*
21fcb34e
FC		 733 * Arg:
734 * device : video output device (LCD, CRT, ..)
1da177e4
LT		 735 *
736 * Return Value:
469778c1
JJ		 737 * Maximum brightness level
738 *
739 * Allocate and initialize device->brightness.
740 */
741
742static int
743acpi_video_init_brightness(struct acpi_video_device *device)
744{
745 union acpi_object *obj = NULL;
d32f6947 746 int i, max_level = 0, count = 0, level_ac_battery = 0;
1a7c618a 747 unsigned long long level, level_old;
469778c1
JJ		 748 union acpi_object *o;
749 struct acpi_video_device_brightness *br = NULL;
1a7c618a 750 int result = -EINVAL;
bd8ba205 751 u32 value;
469778c1
JJ		 752
753 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
754 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
755 "LCD brightness level\n"));
756 goto out;
757 }
758
759 if (obj->package.count < 2)
760 goto out;
761
762 br = kzalloc(sizeof(*br), GFP_KERNEL);
763 if (!br) {
764 printk(KERN_ERR "can't allocate memory\n");
1a7c618a 765 result = -ENOMEM;
469778c1
JJ		 766 goto out;
767 }
768
d32f6947 769 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
469778c1 770 GFP_KERNEL);
1a7c618a
ZR		 771 if (!br->levels) {
772 result = -ENOMEM;
469778c1 773 goto out_free;
1a7c618a 774 }
469778c1
JJ		 775
776 for (i = 0; i < obj->package.count; i++) {
777 o = (union acpi_object *)&obj->package.elements[i];
778 if (o->type != ACPI_TYPE_INTEGER) {
779 printk(KERN_ERR PREFIX "Invalid data\n");
780 continue;
781 }
bd8ba205
HG		 782 value = (u32) o->integer.value;
783 /* Skip duplicate entries */
784 if (count > 2 && br->levels[count - 1] == value)
785 continue;
786
787 br->levels[count] = value;
469778c1
JJ		 788
789 if (br->levels[count] > max_level)
790 max_level = br->levels[count];
791 count++;
792 }
793
d32f6947
ZR		 794 /*
795 * some buggy BIOS don't export the levels
796 * when machine is on AC/Battery in _BCL package.
797 * In this case, the first two elements in _BCL packages
798 * are also supported brightness levels that OS should take care of.
799 */
90af2cf6
ZR		 800 for (i = 2; i < count; i++) {
801 if (br->levels[i] == br->levels[0])
d32f6947 802 level_ac_battery++;
90af2cf6
ZR		 803 if (br->levels[i] == br->levels[1])
804 level_ac_battery++;
805 }
d32f6947
ZR		 806
807 if (level_ac_battery < 2) {
808 level_ac_battery = 2 - level_ac_battery;
809 br->flags._BCL_no_ac_battery_levels = 1;
810 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
811 br->levels[i] = br->levels[i - level_ac_battery];
812 count += level_ac_battery;
813 } else if (level_ac_battery > 2)
bf6787eb 814 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
d32f6947 815
d80fb99f
ZR		 816 /* Check if the _BCL package is in a reversed order */
817 if (max_level == br->levels[2]) {
818 br->flags._BCL_reversed = 1;
819 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
820 acpi_video_cmp_level, NULL);
821 } else if (max_level != br->levels[count - 1])
822 ACPI_ERROR((AE_INFO,
bf6787eb 823 "Found unordered _BCL package"));
469778c1
JJ		 824
825 br->count = count;
826 device->brightness = br;
1a7c618a 827
1a7c618a 828 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
90c53ca4 829 br->curr = level = max_level;
e047cca6
ZR		 830
831 if (!device->cap._BQC)
832 goto set_level;
833
a89803df
DB		 834 result = acpi_video_device_lcd_get_level_current(device,
835 &level_old, true);
1a7c618a
ZR		 836 if (result)
837 goto out_free_levels;
838
a50188da 839 result = acpi_video_bqc_quirk(device, max_level, level_old);
1a7c618a
ZR		 840 if (result)
841 goto out_free_levels;
a50188da
AL		 842 /*
843 * cap._BQC may get cleared due to _BQC is found to be broken
844 * in acpi_video_bqc_quirk, so check again here.
845 */
846 if (!device->cap._BQC)
847 goto set_level;
e047cca6 848
545ef368
AL		 849 level = acpi_video_bqc_value_to_level(device, level_old);
850 /*
851 * On some buggy laptops, _BQC returns an uninitialized
852 * value when invoked for the first time, i.e.
853 * level_old is invalid (no matter whether it's a level
854 * or an index). Set the backlight to max_level in this case.
855 */
856 for (i = 2; i < br->count; i++)
857 if (level == br->levels[i])
858 break;
859 if (i == br->count || !level)
860 level = max_level;
e047cca6 861
e047cca6 862set_level:
90c53ca4 863 result = acpi_video_device_lcd_set_level(device, level);
e047cca6
ZR		 864 if (result)
865 goto out_free_levels;
1a7c618a 866
d32f6947
ZR		 867 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
868 "found %d brightness levels\n", count - 2));
469778c1 869 kfree(obj);
1a7c618a 870 return result;
469778c1
JJ		 871
872out_free_levels:
873 kfree(br->levels);
874out_free:
875 kfree(br);
876out:
877 device->brightness = NULL;
878 kfree(obj);
1a7c618a 879 return result;
469778c1
JJ		 880}
881
882/*
883 * Arg:
884 * device : video output device (LCD, CRT, ..)
885 *
886 * Return Value:
21fcb34e 887 * None
1da177e4 888 *
98fb8fe1 889 * Find out all required AML methods defined under the output
1da177e4
LT		 890 * device.
891 */
892
4be44fcd 893static void acpi_video_device_find_cap(struct acpi_video_device *device)
1da177e4 894{
952c63e9 895 if (acpi_has_method(device->dev->handle, "_ADR"))
1da177e4 896 device->cap._ADR = 1;
952c63e9 897 if (acpi_has_method(device->dev->handle, "_BCL"))
4be44fcd 898 device->cap._BCL = 1;
952c63e9 899 if (acpi_has_method(device->dev->handle, "_BCM"))
4be44fcd 900 device->cap._BCM = 1;
952c63e9 901 if (acpi_has_method(device->dev->handle, "_BQC")) {
2f3d000a 902 device->cap._BQC = 1;
952c63e9 903 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
c60d638e
ZR		 904 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
905 device->cap._BCQ = 1;
906 }
907
952c63e9 908 if (acpi_has_method(device->dev->handle, "_DDC"))
4be44fcd 909 device->cap._DDC = 1;
1da177e4
LT		 910}
911
912/*
21fcb34e
FC		 913 * Arg:
914 * device : video output device (VGA)
1da177e4
LT		 915 *
916 * Return Value:
21fcb34e 917 * None
1da177e4 918 *
98fb8fe1 919 * Find out all required AML methods defined under the video bus device.
1da177e4
LT		 920 */
921
4be44fcd 922static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1da177e4 923{
952c63e9 924 if (acpi_has_method(video->device->handle, "_DOS"))
1da177e4 925 video->cap._DOS = 1;
952c63e9 926 if (acpi_has_method(video->device->handle, "_DOD"))
1da177e4 927 video->cap._DOD = 1;
952c63e9 928 if (acpi_has_method(video->device->handle, "_ROM"))
1da177e4 929 video->cap._ROM = 1;
952c63e9 930 if (acpi_has_method(video->device->handle, "_GPD"))
1da177e4 931 video->cap._GPD = 1;
952c63e9 932 if (acpi_has_method(video->device->handle, "_SPD"))
1da177e4 933 video->cap._SPD = 1;
952c63e9 934 if (acpi_has_method(video->device->handle, "_VPO"))
1da177e4 935 video->cap._VPO = 1;
1da177e4
LT		 936}
937
938/*
939 * Check whether the video bus device has required AML method to
940 * support the desired features
941 */
942
4be44fcd 943static int acpi_video_bus_check(struct acpi_video_bus *video)
1da177e4 944{
4be44fcd 945 acpi_status status = -ENOENT;
1e4cffe7 946 struct pci_dev *dev;
1da177e4
LT		 947
948 if (!video)
d550d98d 949 return -EINVAL;
1da177e4 950
1e4cffe7 951 dev = acpi_get_pci_dev(video->device->handle);
22c13f9d
TR		 952 if (!dev)
953 return -ENODEV;
1e4cffe7 954 pci_dev_put(dev);
22c13f9d 955
21fcb34e
FC		 956 /*
957 * Since there is no HID, CID and so on for VGA driver, we have
1da177e4
LT		 958 * to check well known required nodes.
959 */
960
98fb8fe1 961 /* Does this device support video switching? */
3a1151e3
SB		 962 if (video->cap._DOS || video->cap._DOD) {
963 if (!video->cap._DOS) {
964 printk(KERN_WARNING FW_BUG
965 "ACPI(%s) defines _DOD but not _DOS\n",
966 acpi_device_bid(video->device));
967 }
1da177e4
LT		 968 video->flags.multihead = 1;
969 status = 0;
970 }
971
98fb8fe1 972 /* Does this device support retrieving a video ROM? */
4be44fcd 973 if (video->cap._ROM) {
1da177e4
LT		 974 video->flags.rom = 1;
975 status = 0;
976 }
977
98fb8fe1 978 /* Does this device support configuring which video device to POST? */
4be44fcd 979 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1da177e4
LT		 980 video->flags.post = 1;
981 status = 0;
982 }
983
d550d98d 984 return status;
1da177e4
LT		 985}
986
21fcb34e
FC		 987/*
988 * --------------------------------------------------------------------------
989 * Driver Interface
990 * --------------------------------------------------------------------------
991 */
1da177e4
LT		 992
993/* device interface */
915ea7e4 994static struct acpi_video_device_attrib *
82cae999
RZ		 995acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
996{
78eed028
DT		 997 struct acpi_video_enumerated_device *ids;
998 int i;
999
1000 for (i = 0; i < video->attached_count; i++) {
1001 ids = &video->attached_array[i];
1002 if ((ids->value.int_val & 0xffff) == device_id)
1003 return &ids->value.attrib;
1004 }
82cae999 1005
82cae999
RZ		 1006 return NULL;
1007}
1da177e4 1008
e92a7162
MG		 1009static int
1010acpi_video_get_device_type(struct acpi_video_bus *video,
1011 unsigned long device_id)
1012{
1013 struct acpi_video_enumerated_device *ids;
1014 int i;
1015
1016 for (i = 0; i < video->attached_count; i++) {
1017 ids = &video->attached_array[i];
1018 if ((ids->value.int_val & 0xffff) == device_id)
1019 return ids->value.int_val;
1020 }
1021
1022 return 0;
1023}
1024
1da177e4 1025static int
4be44fcd
LB		 1026acpi_video_bus_get_one_device(struct acpi_device *device,
1027 struct acpi_video_bus *video)
1da177e4 1028{
27663c58 1029 unsigned long long device_id;
e92a7162 1030 int status, device_type;
4be44fcd 1031 struct acpi_video_device *data;
915ea7e4 1032 struct acpi_video_device_attrib *attribute;
1da177e4 1033
4be44fcd
LB		 1034 status =
1035 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
91e13aa3
AL		 1036 /* Some device omits _ADR, we skip them instead of fail */
1037 if (ACPI_FAILURE(status))
1038 return 0;
1da177e4 1039
91e13aa3
AL		 1040 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1041 if (!data)
1042 return -ENOMEM;
82cae999 1043
91e13aa3
AL		 1044 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1045 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1046 device->driver_data = data;
1047
1048 data->device_id = device_id;
1049 data->video = video;
1050 data->dev = device;
8ab58e8e
LT		 1051 INIT_DELAYED_WORK(&data->switch_brightness_work,
1052 acpi_video_switch_brightness);
91e13aa3
AL		 1053
1054 attribute = acpi_video_get_device_attr(video, device_id);
1055
915ea7e4 1056 if (attribute && attribute->device_id_scheme) {
91e13aa3
AL		 1057 switch (attribute->display_type) {
1058 case ACPI_VIDEO_DISPLAY_CRT:
1059 data->flags.crt = 1;
1060 break;
1061 case ACPI_VIDEO_DISPLAY_TV:
1062 data->flags.tvout = 1;
1063 break;
1064 case ACPI_VIDEO_DISPLAY_DVI:
1065 data->flags.dvi = 1;
1066 break;
1067 case ACPI_VIDEO_DISPLAY_LCD:
1068 data->flags.lcd = 1;
1069 break;
1070 default:
1071 data->flags.unknown = 1;
1072 break;
1073 }
915ea7e4 1074 if (attribute->bios_can_detect)
91e13aa3
AL		 1075 data->flags.bios = 1;
1076 } else {
1077 /* Check for legacy IDs */
1078 device_type = acpi_video_get_device_type(video, device_id);
1079 /* Ignore bits 16 and 18-20 */
1080 switch (device_type & 0xffe2ffff) {
915ea7e4
FC		 1081 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1082 data->flags.crt = 1;
1083 break;
1084 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1085 data->flags.lcd = 1;
1086 break;
1087 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1088 data->flags.tvout = 1;
1089 break;
1090 default:
1091 data->flags.unknown = 1;
e92a7162 1092 }
91e13aa3 1093 }
4be44fcd 1094
91e13aa3
AL		 1095 acpi_video_device_bind(video, data);
1096 acpi_video_device_find_cap(data);
1da177e4 1097
91e13aa3
AL		 1098 mutex_lock(&video->device_list_lock);
1099 list_add_tail(&data->entry, &video->video_device_list);
1100 mutex_unlock(&video->device_list_lock);
1da177e4 1101
91e13aa3 1102 return status;
1da177e4
LT		 1103}
1104
1105/*
1106 * Arg:
21fcb34e 1107 * video : video bus device
1da177e4
LT		 1108 *
1109 * Return:
21fcb34e
FC		 1110 * none
1111 *
1112 * Enumerate the video device list of the video bus,
1da177e4
LT		 1113 * bind the ids with the corresponding video devices
1114 * under the video bus.
4be44fcd 1115 */
1da177e4 1116
4be44fcd 1117static void acpi_video_device_rebind(struct acpi_video_bus *video)
1da177e4 1118{
ff102ea9
DT		 1119 struct acpi_video_device *dev;
1120
bbac81f5 1121 mutex_lock(&video->device_list_lock);
ff102ea9
DT		 1122
1123 list_for_each_entry(dev, &video->video_device_list, entry)
4be44fcd 1124 acpi_video_device_bind(video, dev);
ff102ea9 1125
bbac81f5 1126 mutex_unlock(&video->device_list_lock);
1da177e4
LT		 1127}
1128
1129/*
1130 * Arg:
21fcb34e
FC		 1131 * video : video bus device
1132 * device : video output device under the video
1133 * bus
1da177e4
LT		 1134 *
1135 * Return:
21fcb34e
FC		 1136 * none
1137 *
1da177e4
LT		 1138 * Bind the ids with the corresponding video devices
1139 * under the video bus.
4be44fcd 1140 */
1da177e4
LT		 1141
1142static void
4be44fcd
LB		 1143acpi_video_device_bind(struct acpi_video_bus *video,
1144 struct acpi_video_device *device)
1da177e4 1145{
78eed028 1146 struct acpi_video_enumerated_device *ids;
4be44fcd 1147 int i;
1da177e4 1148
78eed028
DT		 1149 for (i = 0; i < video->attached_count; i++) {
1150 ids = &video->attached_array[i];
1151 if (device->device_id == (ids->value.int_val & 0xffff)) {
1152 ids->bind_info = device;
1da177e4
LT		 1153 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1154 }
1155 }
1da177e4
LT		 1156}
1157
0b8db271
AL		 1158static bool acpi_video_device_in_dod(struct acpi_video_device *device)
1159{
1160 struct acpi_video_bus *video = device->video;
1161 int i;
1162
b4df4636
AL		 1163 /*
1164 * If we have a broken _DOD or we have more than 8 output devices
1165 * under the graphics controller node that we can't proper deal with
1166 * in the operation region code currently, no need to test.
1167 */
1168 if (!video->attached_count || video->child_count > 8)
0b8db271
AL		 1169 return true;
1170
1171 for (i = 0; i < video->attached_count; i++) {
35d0565b
AL		 1172 if ((video->attached_array[i].value.int_val & 0xfff) ==
1173 (device->device_id & 0xfff))
0b8db271
AL		 1174 return true;
1175 }
1176
1177 return false;
1178}
1179
1da177e4
LT		 1180/*
1181 * Arg:
21fcb34e 1182 * video : video bus device
1da177e4
LT		 1183 *
1184 * Return:
21fcb34e
FC		 1185 * < 0 : error
1186 *
1da177e4
LT		 1187 * Call _DOD to enumerate all devices attached to display adapter
1188 *
4be44fcd 1189 */
1da177e4
LT		 1190
1191static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1192{
4be44fcd
LB		 1193 int status;
1194 int count;
1195 int i;
78eed028 1196 struct acpi_video_enumerated_device *active_list;
4be44fcd
LB		 1197 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1198 union acpi_object *dod = NULL;
1199 union acpi_object *obj;
1da177e4 1200
90130268 1201 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1da177e4 1202 if (!ACPI_SUCCESS(status)) {
a6fc6720 1203 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
d550d98d 1204 return status;
1da177e4
LT		 1205 }
1206
50dd0969 1207 dod = buffer.pointer;
1da177e4 1208 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
a6fc6720 1209 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1da177e4
LT		 1210 status = -EFAULT;
1211 goto out;
1212 }
1213
1214 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
4be44fcd 1215 dod->package.count));
1da177e4 1216
78eed028
DT		 1217 active_list = kcalloc(1 + dod->package.count,
1218 sizeof(struct acpi_video_enumerated_device),
1219 GFP_KERNEL);
1220 if (!active_list) {
1da177e4
LT		 1221 status = -ENOMEM;
1222 goto out;
1223 }
1224
1225 count = 0;
1226 for (i = 0; i < dod->package.count; i++) {
50dd0969 1227 obj = &dod->package.elements[i];
1da177e4
LT		 1228
1229 if (obj->type != ACPI_TYPE_INTEGER) {
78eed028
DT		 1230 printk(KERN_ERR PREFIX
1231 "Invalid _DOD data in element %d\n", i);
1232 continue;
1da177e4 1233 }
78eed028
DT		 1234
1235 active_list[count].value.int_val = obj->integer.value;
1236 active_list[count].bind_info = NULL;
4be44fcd
LB		 1237 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1238 (int)obj->integer.value));
1da177e4
LT		 1239 count++;
1240 }
1da177e4 1241
6044ec88 1242 kfree(video->attached_array);
4be44fcd 1243
78eed028 1244 video->attached_array = active_list;
1da177e4 1245 video->attached_count = count;
78eed028 1246
915ea7e4 1247out:
02438d87 1248 kfree(buffer.pointer);
d550d98d 1249 return status;
1da177e4
LT		 1250}
1251
4be44fcd
LB		 1252static int
1253acpi_video_get_next_level(struct acpi_video_device *device,
1254 u32 level_current, u32 event)
1da177e4 1255{
63f0edfc 1256 int min, max, min_above, max_below, i, l, delta = 255;
f4715189
TT		 1257 max = max_below = 0;
1258 min = min_above = 255;
63f0edfc 1259 /* Find closest level to level_current */
0a3db1ce 1260 for (i = 2; i < device->brightness->count; i++) {
63f0edfc
AS		 1261 l = device->brightness->levels[i];
1262 if (abs(l - level_current) < abs(delta)) {
1263 delta = l - level_current;
1264 if (!delta)
1265 break;
1266 }
1267 }
1268 /* Ajust level_current to closest available level */
1269 level_current += delta;
0a3db1ce 1270 for (i = 2; i < device->brightness->count; i++) {
f4715189
TT		 1271 l = device->brightness->levels[i];
1272 if (l < min)
1273 min = l;
1274 if (l > max)
1275 max = l;
1276 if (l < min_above && l > level_current)
1277 min_above = l;
1278 if (l > max_below && l < level_current)
1279 max_below = l;
1280 }
1281
1282 switch (event) {
1283 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1284 return (level_current < max) ? min_above : min;
1285 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1286 return (level_current < max) ? min_above : max;
1287 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1288 return (level_current > min) ? max_below : min;
1289 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1290 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1291 return 0;
1292 default:
1293 return level_current;
1294 }
1da177e4
LT		 1295}
1296
8ab58e8e
LT		 1297static void
1298acpi_video_switch_brightness(struct work_struct *work)
1da177e4 1299{
8ab58e8e
LT		 1300 struct acpi_video_device *device = container_of(to_delayed_work(work),
1301 struct acpi_video_device, switch_brightness_work);
27663c58 1302 unsigned long long level_current, level_next;
8ab58e8e 1303 int event = device->switch_brightness_event;
c8890f90
ZR		 1304 int result = -EINVAL;
1305
fbc9fe1b
AL		 1306 /* no warning message if acpi_backlight=vendor or a quirk is used */
1307 if (!acpi_video_verify_backlight_support())
8ab58e8e 1308 return;
28c32e99 1309
469778c1 1310 if (!device->brightness)
c8890f90
ZR		 1311 goto out;
1312
1313 result = acpi_video_device_lcd_get_level_current(device,
a89803df
DB		 1314 &level_current,
1315 false);
c8890f90
ZR		 1316 if (result)
1317 goto out;
1318
1da177e4 1319 level_next = acpi_video_get_next_level(device, level_current, event);
c8890f90 1320
24450c7a 1321 result = acpi_video_device_lcd_set_level(device, level_next);
c8890f90 1322
36342742
MG		 1323 if (!result)
1324 backlight_force_update(device->backlight,
1325 BACKLIGHT_UPDATE_HOTKEY);
1326
c8890f90
ZR		 1327out:
1328 if (result)
1329 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1da177e4
LT		 1330}
1331
e92a7162
MG		 1332int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1333 void **edid)
1334{
1335 struct acpi_video_bus *video;
1336 struct acpi_video_device *video_device;
1337 union acpi_object *buffer = NULL;
1338 acpi_status status;
1339 int i, length;
1340
1341 if (!device || !acpi_driver_data(device))
1342 return -EINVAL;
1343
1344 video = acpi_driver_data(device);
1345
1346 for (i = 0; i < video->attached_count; i++) {
1347 video_device = video->attached_array[i].bind_info;
1348 length = 256;
1349
1350 if (!video_device)
1351 continue;
1352
82069552
ZR		 1353 if (!video_device->cap._DDC)
1354 continue;
1355
e92a7162
MG		 1356 if (type) {
1357 switch (type) {
1358 case ACPI_VIDEO_DISPLAY_CRT:
1359 if (!video_device->flags.crt)
1360 continue;
1361 break;
1362 case ACPI_VIDEO_DISPLAY_TV:
1363 if (!video_device->flags.tvout)
1364 continue;
1365 break;
1366 case ACPI_VIDEO_DISPLAY_DVI:
1367 if (!video_device->flags.dvi)
1368 continue;
1369 break;
1370 case ACPI_VIDEO_DISPLAY_LCD:
1371 if (!video_device->flags.lcd)
1372 continue;
1373 break;
1374 }
1375 } else if (video_device->device_id != device_id) {
1376 continue;
1377 }
1378
1379 status = acpi_video_device_EDID(video_device, &buffer, length);
1380
1381 if (ACPI_FAILURE(status) || !buffer ||
1382 buffer->type != ACPI_TYPE_BUFFER) {
1383 length = 128;
1384 status = acpi_video_device_EDID(video_device, &buffer,
1385 length);
1386 if (ACPI_FAILURE(status) || !buffer ||
1387 buffer->type != ACPI_TYPE_BUFFER) {
1388 continue;
1389 }
1390 }
1391
1392 *edid = buffer->buffer.pointer;
1393 return length;
1394 }
1395
1396 return -ENODEV;
1397}
1398EXPORT_SYMBOL(acpi_video_get_edid);
1399
1da177e4 1400static int
4be44fcd
LB		 1401acpi_video_bus_get_devices(struct acpi_video_bus *video,
1402 struct acpi_device *device)
1da177e4 1403{
fba4e087 1404 int status = 0;
ff102ea9 1405 struct acpi_device *dev;
1da177e4 1406
fba4e087
IM		 1407 /*
1408 * There are systems where video module known to work fine regardless
1409 * of broken _DOD and ignoring returned value here doesn't cause
1410 * any issues later.
1411 */
1412 acpi_video_device_enumerate(video);
1da177e4 1413
ff102ea9 1414 list_for_each_entry(dev, &device->children, node) {
1da177e4
LT		 1415
1416 status = acpi_video_bus_get_one_device(dev, video);
ea9f8856 1417 if (status) {
91e13aa3
AL		 1418 dev_err(&dev->dev, "Can't attach device\n");
1419 break;
1da177e4 1420 }
b4df4636 1421 video->child_count++;
1da177e4 1422 }
d550d98d 1423 return status;
1da177e4
LT		 1424}
1425
1da177e4
LT		 1426/* acpi_video interface */
1427
efaa14c7
AL		 1428/*
1429 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1430 * preform any automatic brightness change on receiving a notification.
1431 */
4be44fcd 1432static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1da177e4 1433{
efaa14c7 1434 return acpi_video_bus_DOS(video, 0,
fbc9fe1b 1435 acpi_osi_is_win8() ? 1 : 0);
1da177e4
LT		 1436}
1437
4be44fcd 1438static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1da177e4 1439{
efaa14c7 1440 return acpi_video_bus_DOS(video, 0,
fbc9fe1b 1441 acpi_osi_is_win8() ? 0 : 1);
1da177e4
LT		 1442}
1443
7015558f 1444static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1da177e4 1445{
7015558f 1446 struct acpi_video_bus *video = acpi_driver_data(device);
e9dab196 1447 struct input_dev *input;
17c452f9 1448 int keycode = 0;
e9dab196 1449
67b662e1 1450 if (!video || !video->input)
d550d98d 1451 return;
1da177e4 1452
e9dab196 1453 input = video->input;
1da177e4
LT		 1454
1455 switch (event) {
98fb8fe1 1456 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1da177e4 1457 * most likely via hotkey. */
8a37c65d 1458 keycode = KEY_SWITCHVIDEOMODE;
1da177e4
LT		 1459 break;
1460
98fb8fe1 1461 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1da177e4
LT		 1462 * connector. */
1463 acpi_video_device_enumerate(video);
1464 acpi_video_device_rebind(video);
e9dab196 1465 keycode = KEY_SWITCHVIDEOMODE;
1da177e4
LT		 1466 break;
1467
4be44fcd 1468 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
e9dab196
LY		 1469 keycode = KEY_SWITCHVIDEOMODE;
1470 break;
4be44fcd 1471 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
e9dab196
LY		 1472 keycode = KEY_VIDEO_NEXT;
1473 break;
4be44fcd 1474 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
e9dab196 1475 keycode = KEY_VIDEO_PREV;
1da177e4
LT		 1476 break;
1477
1478 default:
1479 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
4be44fcd 1480 "Unsupported event [0x%x]\n", event));
1da177e4
LT		 1481 break;
1482 }
1483
8a37c65d
LT		 1484 if (acpi_notifier_call_chain(device, event, 0))
1485 /* Something vetoed the keypress. */
1486 keycode = 0;
17c452f9
MG		 1487
1488 if (keycode) {
1489 input_report_key(input, keycode, 1);
1490 input_sync(input);
1491 input_report_key(input, keycode, 0);
1492 input_sync(input);
1493 }
e9dab196 1494
d550d98d 1495 return;
1da177e4
LT		 1496}
1497
8ab58e8e
LT		 1498static void brightness_switch_event(struct acpi_video_device *video_device,
1499 u32 event)
1500{
1501 if (!brightness_switch_enabled)
1502 return;
1503
1504 video_device->switch_brightness_event = event;
1505 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1506}
1507
4be44fcd 1508static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1da177e4 1509{
50dd0969 1510 struct acpi_video_device *video_device = data;
4be44fcd 1511 struct acpi_device *device = NULL;
e9dab196
LY		 1512 struct acpi_video_bus *bus;
1513 struct input_dev *input;
17c452f9 1514 int keycode = 0;
1da177e4 1515
1da177e4 1516 if (!video_device)
d550d98d 1517 return;
1da177e4 1518
e6afa0de 1519 device = video_device->dev;
e9dab196
LY		 1520 bus = video_device->video;
1521 input = bus->input;
1da177e4
LT		 1522
1523 switch (event) {
4be44fcd 1524 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
8ab58e8e 1525 brightness_switch_event(video_device, event);
e9dab196
LY		 1526 keycode = KEY_BRIGHTNESS_CYCLE;
1527 break;
4be44fcd 1528 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
8ab58e8e 1529 brightness_switch_event(video_device, event);
e9dab196
LY		 1530 keycode = KEY_BRIGHTNESSUP;
1531 break;
4be44fcd 1532 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
8ab58e8e 1533 brightness_switch_event(video_device, event);
e9dab196
LY		 1534 keycode = KEY_BRIGHTNESSDOWN;
1535 break;
70f23fd6 1536 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
8ab58e8e 1537 brightness_switch_event(video_device, event);
e9dab196
LY		 1538 keycode = KEY_BRIGHTNESS_ZERO;
1539 break;
4be44fcd 1540 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
8ab58e8e 1541 brightness_switch_event(video_device, event);
e9dab196 1542 keycode = KEY_DISPLAY_OFF;
1da177e4
LT		 1543 break;
1544 default:
1545 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
4be44fcd 1546 "Unsupported event [0x%x]\n", event));
1da177e4
LT		 1547 break;
1548 }
e9dab196 1549
7761f638 1550 acpi_notifier_call_chain(device, event, 0);
17c452f9
MG		 1551
1552 if (keycode) {
1553 input_report_key(input, keycode, 1);
1554 input_sync(input);
1555 input_report_key(input, keycode, 0);
1556 input_sync(input);
1557 }
e9dab196 1558
d550d98d 1559 return;
1da177e4
LT		 1560}
1561
ac7729da
RW		 1562static int acpi_video_resume(struct notifier_block *nb,
1563 unsigned long val, void *ign)
863c1490
MG		 1564{
1565 struct acpi_video_bus *video;
1566 struct acpi_video_device *video_device;
1567 int i;
1568
ac7729da
RW		 1569 switch (val) {
1570 case PM_HIBERNATION_PREPARE:
1571 case PM_SUSPEND_PREPARE:
1572 case PM_RESTORE_PREPARE:
1573 return NOTIFY_DONE;
1574 }
863c1490 1575
ac7729da
RW		 1576 video = container_of(nb, struct acpi_video_bus, pm_nb);
1577
1578 dev_info(&video->device->dev, "Restoring backlight state\n");
863c1490
MG		 1579
1580 for (i = 0; i < video->attached_count; i++) {
1581 video_device = video->attached_array[i].bind_info;
1582 if (video_device && video_device->backlight)
1583 acpi_video_set_brightness(video_device->backlight);
1584 }
ac7729da
RW		 1585
1586 return NOTIFY_OK;
863c1490
MG		 1587}
1588
c504f8cb
ZR		 1589static acpi_status
1590acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1591 void **return_value)
1592{
1593 struct acpi_device *device = context;
1594 struct acpi_device *sibling;
1595 int result;
1596
1597 if (handle == device->handle)
1598 return AE_CTRL_TERMINATE;
1599
1600 result = acpi_bus_get_device(handle, &sibling);
1601 if (result)
1602 return AE_OK;
1603
1604 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1605 return AE_ALREADY_EXISTS;
1606
1607 return AE_OK;
1608}
1609
67b662e1
AL		 1610static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1611{
99678ed7
HG		 1612 struct backlight_properties props;
1613 struct pci_dev *pdev;
1614 acpi_handle acpi_parent;
1615 struct device *parent = NULL;
1616 int result;
1617 static int count;
1618 char *name;
67b662e1 1619
0b8db271
AL		 1620 /*
1621 * Do not create backlight device for video output
1622 * device that is not in the enumerated list.
1623 */
1624 if (!acpi_video_device_in_dod(device)) {
1625 dev_dbg(&device->dev->dev, "not in _DOD list, ignore\n");
1626 return;
1627 }
1628
99678ed7
HG		 1629 result = acpi_video_init_brightness(device);
1630 if (result)
1631 return;
1632 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1633 if (!name)
1634 return;
1635 count++;
67b662e1 1636
99678ed7 1637 acpi_get_parent(device->dev->handle, &acpi_parent);
67b662e1 1638
99678ed7
HG		 1639 pdev = acpi_get_pci_dev(acpi_parent);
1640 if (pdev) {
1641 parent = &pdev->dev;
1642 pci_dev_put(pdev);
1643 }
67b662e1 1644
99678ed7
HG		 1645 memset(&props, 0, sizeof(struct backlight_properties));
1646 props.type = BACKLIGHT_FIRMWARE;
1647 props.max_brightness = device->brightness->count - 3;
1648 device->backlight = backlight_device_register(name,
1649 parent,
1650 device,
1651 &acpi_backlight_ops,
1652 &props);
1653 kfree(name);
1654 if (IS_ERR(device->backlight))
1655 return;
67b662e1 1656
99678ed7
HG		 1657 /*
1658 * Save current brightness level in case we have to restore it
1659 * before acpi_video_device_lcd_set_level() is called next time.
1660 */
1661 device->backlight->props.brightness =
1662 acpi_video_get_brightness(device->backlight);
67b662e1 1663
99678ed7
HG		 1664 device->cooling_dev = thermal_cooling_device_register("LCD",
1665 device->dev, &video_cooling_ops);
1666 if (IS_ERR(device->cooling_dev)) {
1667 /*
1668 * Set cooling_dev to NULL so we don't crash trying to free it.
1669 * Also, why the hell we are returning early and not attempt to
1670 * register video output if cooling device registration failed?
1671 * -- dtor
1672 */
1673 device->cooling_dev = NULL;
1674 return;
67b662e1 1675 }
99678ed7
HG		 1676
1677 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1678 device->cooling_dev->id);
1679 result = sysfs_create_link(&device->dev->dev.kobj,
1680 &device->cooling_dev->device.kobj,
1681 "thermal_cooling");
1682 if (result)
1683 printk(KERN_ERR PREFIX "Create sysfs link\n");
1684 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1685 &device->dev->dev.kobj, "device");
1686 if (result)
1687 printk(KERN_ERR PREFIX "Create sysfs link\n");
67b662e1
AL		 1688}
1689
dce4ec2e
AL		 1690static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)
1691{
1692 struct acpi_video_device *dev;
1693 union acpi_object *levels;
1694
1695 mutex_lock(&video->device_list_lock);
1696 list_for_each_entry(dev, &video->video_device_list, entry) {
1697 if (!acpi_video_device_lcd_query_levels(dev, &levels))
1698 kfree(levels);
1699 }
1700 mutex_unlock(&video->device_list_lock);
1701}
1702
67b662e1
AL		 1703static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1704{
1705 struct acpi_video_device *dev;
1706
53a92ba7
HG		 1707 if (video->backlight_registered)
1708 return 0;
1709
dce4ec2e
AL		 1710 acpi_video_run_bcl_for_osi(video);
1711
99678ed7
HG		 1712 if (!acpi_video_verify_backlight_support())
1713 return 0;
1714
67b662e1
AL		 1715 mutex_lock(&video->device_list_lock);
1716 list_for_each_entry(dev, &video->video_device_list, entry)
1717 acpi_video_dev_register_backlight(dev);
1718 mutex_unlock(&video->device_list_lock);
1719
99678ed7
HG		 1720 video->backlight_registered = true;
1721
67b662e1
AL		 1722 video->pm_nb.notifier_call = acpi_video_resume;
1723 video->pm_nb.priority = 0;
1724 return register_pm_notifier(&video->pm_nb);
1725}
1726
1727static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1728{
1729 if (device->backlight) {
1730 backlight_device_unregister(device->backlight);
1731 device->backlight = NULL;
1732 }
1733 if (device->brightness) {
1734 kfree(device->brightness->levels);
1735 kfree(device->brightness);
1736 device->brightness = NULL;
1737 }
1738 if (device->cooling_dev) {
1739 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1740 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1741 thermal_cooling_device_unregister(device->cooling_dev);
1742 device->cooling_dev = NULL;
1743 }
1744}
1745
1746static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1747{
1748 struct acpi_video_device *dev;
99678ed7
HG		 1749 int error;
1750
1751 if (!video->backlight_registered)
1752 return 0;
1753
1754 error = unregister_pm_notifier(&video->pm_nb);
67b662e1
AL		 1755
1756 mutex_lock(&video->device_list_lock);
1757 list_for_each_entry(dev, &video->video_device_list, entry)
1758 acpi_video_dev_unregister_backlight(dev);
1759 mutex_unlock(&video->device_list_lock);
1760
99678ed7
HG		 1761 video->backlight_registered = false;
1762
67b662e1
AL		 1763 return error;
1764}
1765
1766static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1767{
1768 acpi_status status;
1769 struct acpi_device *adev = device->dev;
1770
1771 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1772 acpi_video_device_notify, device);
1773 if (ACPI_FAILURE(status))
1774 dev_err(&adev->dev, "Error installing notify handler\n");
1775 else
1776 device->flags.notify = 1;
1777}
1778
1779static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1780{
1781 struct input_dev *input;
1782 struct acpi_video_device *dev;
1783 int error;
1784
1785 video->input = input = input_allocate_device();
1786 if (!input) {
1787 error = -ENOMEM;
1788 goto out;
1789 }
1790
1791 error = acpi_video_bus_start_devices(video);
1792 if (error)
1793 goto err_free_input;
1794
1795 snprintf(video->phys, sizeof(video->phys),
1796 "%s/video/input0", acpi_device_hid(video->device));
1797
1798 input->name = acpi_device_name(video->device);
1799 input->phys = video->phys;
1800 input->id.bustype = BUS_HOST;
1801 input->id.product = 0x06;
1802 input->dev.parent = &video->device->dev;
1803 input->evbit[0] = BIT(EV_KEY);
1804 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1805 set_bit(KEY_VIDEO_NEXT, input->keybit);
1806 set_bit(KEY_VIDEO_PREV, input->keybit);
1807 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1808 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1809 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1810 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1811 set_bit(KEY_DISPLAY_OFF, input->keybit);
1812
1813 error = input_register_device(input);
1814 if (error)
1815 goto err_stop_dev;
1816
1817 mutex_lock(&video->device_list_lock);
1818 list_for_each_entry(dev, &video->video_device_list, entry)
1819 acpi_video_dev_add_notify_handler(dev);
1820 mutex_unlock(&video->device_list_lock);
1821
1822 return 0;
1823
1824err_stop_dev:
1825 acpi_video_bus_stop_devices(video);
1826err_free_input:
1827 input_free_device(input);
1828 video->input = NULL;
1829out:
1830 return error;
1831}
1832
1833static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1834{
1835 if (dev->flags.notify) {
1836 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1837 acpi_video_device_notify);
1838 dev->flags.notify = 0;
1839 }
1840}
1841
1842static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1843{
1844 struct acpi_video_device *dev;
1845
1846 mutex_lock(&video->device_list_lock);
1847 list_for_each_entry(dev, &video->video_device_list, entry)
1848 acpi_video_dev_remove_notify_handler(dev);
1849 mutex_unlock(&video->device_list_lock);
1850
1851 acpi_video_bus_stop_devices(video);
1852 input_unregister_device(video->input);
1853 video->input = NULL;
1854}
1855
53a92ba7
HG		 1856static int acpi_video_backlight_notify(struct notifier_block *nb,
1857 unsigned long val, void *bd)
1858{
1859 struct backlight_device *backlight = bd;
1860 struct acpi_video_bus *video;
1861
1862 /* acpi_video_verify_backlight_support only cares about raw devices */
1863 if (backlight->props.type != BACKLIGHT_RAW)
1864 return NOTIFY_DONE;
1865
1866 video = container_of(nb, struct acpi_video_bus, backlight_nb);
1867
1868 switch (val) {
1869 case BACKLIGHT_REGISTERED:
1870 if (!acpi_video_verify_backlight_support())
1871 acpi_video_bus_unregister_backlight(video);
1872 break;
1873 case BACKLIGHT_UNREGISTERED:
1874 acpi_video_bus_register_backlight(video);
1875 break;
1876 }
1877
1878 return NOTIFY_OK;
1879}
1880
1881static int acpi_video_bus_add_backlight_notify_handler(
1882 struct acpi_video_bus *video)
1883{
1884 int error;
1885
1886 video->backlight_nb.notifier_call = acpi_video_backlight_notify;
1887 video->backlight_nb.priority = 0;
1888 error = backlight_register_notifier(&video->backlight_nb);
1889 if (error == 0)
1890 video->backlight_notifier_registered = true;
1891
1892 return error;
1893}
1894
1895static int acpi_video_bus_remove_backlight_notify_handler(
1896 struct acpi_video_bus *video)
1897{
1898 if (!video->backlight_notifier_registered)
1899 return 0;
1900
1901 video->backlight_notifier_registered = false;
1902
1903 return backlight_unregister_notifier(&video->backlight_nb);
1904}
1905
67b662e1
AL		 1906static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1907{
1908 struct acpi_video_device *dev, *next;
1909
1910 mutex_lock(&video->device_list_lock);
1911 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1912 list_del(&dev->entry);
1913 kfree(dev);
1914 }
1915 mutex_unlock(&video->device_list_lock);
1916
1917 return 0;
1918}
1919
ac7729da
RW		 1920static int instance;
1921
4be44fcd 1922static int acpi_video_bus_add(struct acpi_device *device)
1da177e4 1923{
f51e8391 1924 struct acpi_video_bus *video;
f51e8391 1925 int error;
c504f8cb
ZR		 1926 acpi_status status;
1927
1928 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1929 device->parent->handle, 1,
1930 acpi_video_bus_match, NULL,
1931 device, NULL);
1932 if (status == AE_ALREADY_EXISTS) {
1933 printk(KERN_WARNING FW_BUG
1934 "Duplicate ACPI video bus devices for the"
1935 " same VGA controller, please try module "
1936 "parameter \"video.allow_duplicates=1\""
1937 "if the current driver doesn't work.\n");
1938 if (!allow_duplicates)
1939 return -ENODEV;
1940 }
1da177e4 1941
36bcbec7 1942 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1da177e4 1943 if (!video)
d550d98d 1944 return -ENOMEM;
1da177e4 1945
e6d9da1d
ZR		 1946 /* a hack to fix the duplicate name "VID" problem on T61 */
1947 if (!strcmp(device->pnp.bus_id, "VID")) {
1948 if (instance)
1949 device->pnp.bus_id[3] = '0' + instance;
915ea7e4 1950 instance++;
e6d9da1d 1951 }
f3b39f13
ZY		 1952 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1953 if (!strcmp(device->pnp.bus_id, "VGA")) {
1954 if (instance)
1955 device->pnp.bus_id[3] = '0' + instance;
1956 instance++;
1957 }
e6d9da1d 1958
e6afa0de 1959 video->device = device;
1da177e4
LT		 1960 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1961 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
db89b4f0 1962 device->driver_data = video;
1da177e4
LT		 1963
1964 acpi_video_bus_find_cap(video);
f51e8391
DT		 1965 error = acpi_video_bus_check(video);
1966 if (error)
1967 goto err_free_video;
1da177e4 1968
bbac81f5 1969 mutex_init(&video->device_list_lock);
1da177e4
LT		 1970 INIT_LIST_HEAD(&video->video_device_list);
1971
ea9f8856
IM		 1972 error = acpi_video_bus_get_devices(video, device);
1973 if (error)
91e13aa3 1974 goto err_put_video;
1da177e4 1975
1da177e4 1976 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
4be44fcd
LB		 1977 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1978 video->flags.multihead ? "yes" : "no",
1979 video->flags.rom ? "yes" : "no",
1980 video->flags.post ? "yes" : "no");
67b662e1
AL		 1981 mutex_lock(&video_list_lock);
1982 list_add_tail(&video->entry, &video_bus_head);
1983 mutex_unlock(&video_list_lock);
1da177e4 1984
67b662e1
AL		 1985 acpi_video_bus_register_backlight(video);
1986 acpi_video_bus_add_notify_handler(video);
53a92ba7 1987 acpi_video_bus_add_backlight_notify_handler(video);
ac7729da 1988
f51e8391
DT		 1989 return 0;
1990
67b662e1 1991err_put_video:
f51e8391
DT		 1992 acpi_video_bus_put_devices(video);
1993 kfree(video->attached_array);
67b662e1 1994err_free_video:
f51e8391 1995 kfree(video);
db89b4f0 1996 device->driver_data = NULL;
1da177e4 1997
f51e8391 1998 return error;
1da177e4
LT		 1999}
2000
51fac838 2001static int acpi_video_bus_remove(struct acpi_device *device)
1da177e4 2002{
4be44fcd 2003 struct acpi_video_bus *video = NULL;
1da177e4 2004
1da177e4
LT		 2005
2006 if (!device || !acpi_driver_data(device))
d550d98d 2007 return -EINVAL;
1da177e4 2008
50dd0969 2009 video = acpi_driver_data(device);
1da177e4 2010
53a92ba7 2011 acpi_video_bus_remove_backlight_notify_handler(video);
67b662e1
AL		 2012 acpi_video_bus_remove_notify_handler(video);
2013 acpi_video_bus_unregister_backlight(video);
1da177e4 2014 acpi_video_bus_put_devices(video);
1da177e4 2015
67b662e1
AL		 2016 mutex_lock(&video_list_lock);
2017 list_del(&video->entry);
2018 mutex_unlock(&video_list_lock);
2019
6044ec88 2020 kfree(video->attached_array);
1da177e4
LT		 2021 kfree(video);
2022
d550d98d 2023 return 0;
1da177e4
LT		 2024}
2025
c6996bdd
AC		 2026static int __init is_i740(struct pci_dev *dev)
2027{
2028 if (dev->device == 0x00D1)
2029 return 1;
2030 if (dev->device == 0x7000)
2031 return 1;
2032 return 0;
2033}
2034
74a365b3
MG		 2035static int __init intel_opregion_present(void)
2036{
c6996bdd 2037 int opregion = 0;
74a365b3
MG		 2038 struct pci_dev *dev = NULL;
2039 u32 address;
2040
2041 for_each_pci_dev(dev) {
2042 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2043 continue;
2044 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2045 continue;
c6996bdd
AC		 2046 /* We don't want to poke around undefined i740 registers */
2047 if (is_i740(dev))
2048 continue;
74a365b3
MG		 2049 pci_read_config_dword(dev, 0xfc, &address);
2050 if (!address)
2051 continue;
c6996bdd 2052 opregion = 1;
74a365b3 2053 }
c6996bdd 2054 return opregion;
74a365b3
MG		 2055}
2056
8e5c2b77 2057int acpi_video_register(void)
1da177e4 2058{
8e5c2b77 2059 int result = 0;
86e437f0
ZY		 2060 if (register_count) {
2061 /*
8e5c2b77
RW		 2062 * if the function of acpi_video_register is already called,
2063 * don't register the acpi_vide_bus again and return no error.
86e437f0
ZY		 2064 */
2065 return 0;
2066 }
1da177e4 2067
67b662e1
AL		 2068 mutex_init(&video_list_lock);
2069 INIT_LIST_HEAD(&video_bus_head);
2070
1da177e4 2071 result = acpi_bus_register_driver(&acpi_video_bus);
39fe394d 2072 if (result < 0)
d550d98d 2073 return -ENODEV;
1da177e4 2074
86e437f0
ZY		 2075 /*
2076 * When the acpi_video_bus is loaded successfully, increase
2077 * the counter reference.
2078 */
2079 register_count = 1;
2080
d550d98d 2081 return 0;
1da177e4 2082}
8e5c2b77 2083EXPORT_SYMBOL(acpi_video_register);
74a365b3 2084
86e437f0
ZY		 2085void acpi_video_unregister(void)
2086{
2087 if (!register_count) {
2088 /*
2089 * If the acpi video bus is already unloaded, don't
2090 * unload it again and return directly.
2091 */
2092 return;
2093 }
2094 acpi_bus_unregister_driver(&acpi_video_bus);
2095
86e437f0
ZY		 2096 register_count = 0;
2097
2098 return;
2099}
2100EXPORT_SYMBOL(acpi_video_unregister);
2101
1b7f37e1
HG		 2102void acpi_video_unregister_backlight(void)
2103{
2104 struct acpi_video_bus *video;
2105
2106 if (!register_count)
2107 return;
2108
2109 mutex_lock(&video_list_lock);
2110 list_for_each_entry(video, &video_bus_head, entry)
2111 acpi_video_bus_unregister_backlight(video);
2112 mutex_unlock(&video_list_lock);
2113}
2114EXPORT_SYMBOL(acpi_video_unregister_backlight);
2115
74a365b3
MG		 2116/*
2117 * This is kind of nasty. Hardware using Intel chipsets may require
2118 * the video opregion code to be run first in order to initialise
2119 * state before any ACPI video calls are made. To handle this we defer
2120 * registration of the video class until the opregion code has run.
2121 */
2122
2123static int __init acpi_video_init(void)
2124{
45cb50e6
ZR		 2125 dmi_check_system(video_dmi_table);
2126
74a365b3
MG		 2127 if (intel_opregion_present())
2128 return 0;
2129
2130 return acpi_video_register();
2131}
1da177e4 2132
86e437f0 2133static void __exit acpi_video_exit(void)
1da177e4 2134{
86e437f0 2135 acpi_video_unregister();
1da177e4 2136
d550d98d 2137 return;
1da177e4
LT		 2138}
2139
2140module_init(acpi_video_init);
2141module_exit(acpi_video_exit);
Linux kernel - Deliverables
This page took 1.046324 seconds and 5 git commands to generate.