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ACPI / video: Add disable_native_backlight quirk for Dell XPS15 L521X
[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 },
7d0b9349
AL		 508
509 {
510 .callback = video_disable_native_backlight,
511 .ident = "SAMSUNG 870Z5E/880Z5E/680Z5E",
512 .matches = {
513 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
514 DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
515 },
516 },
517 {
518 .callback = video_disable_native_backlight,
519 .ident = "SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V",
520 .matches = {
521 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
522 DMI_MATCH(DMI_PRODUCT_NAME, "370R4E/370R4V/370R5E/3570RE/370R5V"),
523 },
524 },
6a3ef10b
HG		 525
526 {
527 /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
528 .callback = video_disable_native_backlight,
529 .ident = "Dell XPS15 L521X",
530 .matches = {
531 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
532 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
533 },
534 },
45cb50e6
ZR		 535 {}
536};
537
994fa63c
DB		 538static unsigned long long
539acpi_video_bqc_value_to_level(struct acpi_video_device *device,
540 unsigned long long bqc_value)
541{
542 unsigned long long level;
543
544 if (device->brightness->flags._BQC_use_index) {
545 /*
546 * _BQC returns an index that doesn't account for
547 * the first 2 items with special meaning, so we need
548 * to compensate for that by offsetting ourselves
549 */
550 if (device->brightness->flags._BCL_reversed)
551 bqc_value = device->brightness->count - 3 - bqc_value;
552
553 level = device->brightness->levels[bqc_value + 2];
554 } else {
555 level = bqc_value;
556 }
557
558 level += bqc_offset_aml_bug_workaround;
559
560 return level;
561}
562
1da177e4 563static int
4be44fcd 564acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
a89803df 565 unsigned long long *level, bool raw)
1da177e4 566{
c8890f90 567 acpi_status status = AE_OK;
4e231fa4 568 int i;
c8890f90 569
c60d638e
ZR		 570 if (device->cap._BQC || device->cap._BCQ) {
571 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
572
573 status = acpi_evaluate_integer(device->dev->handle, buf,
c8890f90
ZR		 574 NULL, level);
575 if (ACPI_SUCCESS(status)) {
a89803df
DB		 576 if (raw) {
577 /*
578 * Caller has indicated he wants the raw
579 * value returned by _BQC, so don't furtherly
580 * mess with the value.
581 */
582 return 0;
583 }
584
994fa63c 585 *level = acpi_video_bqc_value_to_level(device, *level);
1a7c618a 586
4e231fa4
VS		 587 for (i = 2; i < device->brightness->count; i++)
588 if (device->brightness->levels[i] == *level) {
589 device->brightness->curr = *level;
590 return 0;
915ea7e4 591 }
a89803df
DB		 592 /*
593 * BQC returned an invalid level.
594 * Stop using it.
595 */
596 ACPI_WARNING((AE_INFO,
597 "%s returned an invalid level",
598 buf));
599 device->cap._BQC = device->cap._BCQ = 0;
c8890f90 600 } else {
21fcb34e
FC		 601 /*
602 * Fixme:
c8890f90
ZR		 603 * should we return an error or ignore this failure?
604 * dev->brightness->curr is a cached value which stores
605 * the correct current backlight level in most cases.
606 * ACPI video backlight still works w/ buggy _BQC.
607 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
608 */
c60d638e
ZR		 609 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
610 device->cap._BQC = device->cap._BCQ = 0;
c8890f90
ZR		 611 }
612 }
613
4500ca8e 614 *level = device->brightness->curr;
c8890f90 615 return 0;
1da177e4
LT		 616}
617
618static int
4be44fcd
LB		 619acpi_video_device_EDID(struct acpi_video_device *device,
620 union acpi_object **edid, ssize_t length)
1da177e4 621{
4be44fcd
LB		 622 int status;
623 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
624 union acpi_object *obj;
625 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
626 struct acpi_object_list args = { 1, &arg0 };
1da177e4 627
1da177e4
LT		 628
629 *edid = NULL;
630
631 if (!device)
d550d98d 632 return -ENODEV;
1da177e4
LT		 633 if (length == 128)
634 arg0.integer.value = 1;
635 else if (length == 256)
636 arg0.integer.value = 2;
637 else
d550d98d 638 return -EINVAL;
1da177e4 639
90130268 640 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
1da177e4 641 if (ACPI_FAILURE(status))
d550d98d 642 return -ENODEV;
1da177e4 643
50dd0969 644 obj = buffer.pointer;
1da177e4
LT		 645
646 if (obj && obj->type == ACPI_TYPE_BUFFER)
647 *edid = obj;
648 else {
6468463a 649 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
1da177e4
LT		 650 status = -EFAULT;
651 kfree(obj);
652 }
653
d550d98d 654 return status;
1da177e4
LT		 655}
656
1da177e4
LT		 657/* bus */
658
1da177e4
LT		 659/*
660 * Arg:
21fcb34e
FC		 661 * video : video bus device pointer
662 * bios_flag :
1da177e4
LT		 663 * 0. The system BIOS should NOT automatically switch(toggle)
664 * the active display output.
665 * 1. The system BIOS should automatically switch (toggle) the
98fb8fe1 666 * active display output. No switch event.
1da177e4
LT		 667 * 2. The _DGS value should be locked.
668 * 3. The system BIOS should not automatically switch (toggle) the
669 * active display output, but instead generate the display switch
670 * event notify code.
671 * lcd_flag :
672 * 0. The system BIOS should automatically control the brightness level
98fb8fe1 673 * of the LCD when the power changes from AC to DC
21fcb34e 674 * 1. The system BIOS should NOT automatically control the brightness
98fb8fe1 675 * level of the LCD when the power changes from AC to DC.
21fcb34e 676 * Return Value:
ea9f8856 677 * -EINVAL wrong arg.
1da177e4
LT		 678 */
679
680static int
4be44fcd 681acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
1da177e4 682{
ea9f8856 683 acpi_status status;
1da177e4 684
b0373843
ZR		 685 if (!video->cap._DOS)
686 return 0;
1da177e4 687
ea9f8856
IM		 688 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
689 return -EINVAL;
0db98202
JL		 690 video->dos_setting = (lcd_flag << 2) | bios_flag;
691 status = acpi_execute_simple_method(video->device->handle, "_DOS",
692 (lcd_flag << 2) | bios_flag);
ea9f8856
IM		 693 if (ACPI_FAILURE(status))
694 return -EIO;
1da177e4 695
ea9f8856 696 return 0;
1da177e4
LT		 697}
698
935e5f29
ZR		 699/*
700 * Simple comparison function used to sort backlight levels.
701 */
702
703static int
704acpi_video_cmp_level(const void *a, const void *b)
705{
706 return *(int *)a - *(int *)b;
707}
708
a50188da
AL		 709/*
710 * Decides if _BQC/_BCQ for this system is usable
711 *
712 * We do this by changing the level first and then read out the current
713 * brightness level, if the value does not match, find out if it is using
714 * index. If not, clear the _BQC/_BCQ capability.
715 */
716static int acpi_video_bqc_quirk(struct acpi_video_device *device,
717 int max_level, int current_level)
718{
719 struct acpi_video_device_brightness *br = device->brightness;
720 int result;
721 unsigned long long level;
722 int test_level;
723
724 /* don't mess with existing known broken systems */
725 if (bqc_offset_aml_bug_workaround)
726 return 0;
727
728 /*
729 * Some systems always report current brightness level as maximum
730 * through _BQC, we need to test another value for them.
731 */
b3b301c5 732 test_level = current_level == max_level ? br->levels[3] : max_level;
a50188da
AL		 733
734 result = acpi_video_device_lcd_set_level(device, test_level);
735 if (result)
736 return result;
737
738 result = acpi_video_device_lcd_get_level_current(device, &level, true);
739 if (result)
740 return result;
741
742 if (level != test_level) {
743 /* buggy _BQC found, need to find out if it uses index */
744 if (level < br->count) {
745 if (br->flags._BCL_reversed)
746 level = br->count - 3 - level;
747 if (br->levels[level + 2] == test_level)
748 br->flags._BQC_use_index = 1;
749 }
750
751 if (!br->flags._BQC_use_index)
752 device->cap._BQC = device->cap._BCQ = 0;
753 }
754
755 return 0;
756}
757
758
1da177e4 759/*
21fcb34e
FC		 760 * Arg:
761 * device : video output device (LCD, CRT, ..)
1da177e4
LT		 762 *
763 * Return Value:
469778c1
JJ		 764 * Maximum brightness level
765 *
766 * Allocate and initialize device->brightness.
767 */
768
769static int
770acpi_video_init_brightness(struct acpi_video_device *device)
771{
772 union acpi_object *obj = NULL;
d32f6947 773 int i, max_level = 0, count = 0, level_ac_battery = 0;
1a7c618a 774 unsigned long long level, level_old;
469778c1
JJ		 775 union acpi_object *o;
776 struct acpi_video_device_brightness *br = NULL;
1a7c618a 777 int result = -EINVAL;
bd8ba205 778 u32 value;
469778c1
JJ		 779
780 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
781 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
782 "LCD brightness level\n"));
783 goto out;
784 }
785
786 if (obj->package.count < 2)
787 goto out;
788
789 br = kzalloc(sizeof(*br), GFP_KERNEL);
790 if (!br) {
791 printk(KERN_ERR "can't allocate memory\n");
1a7c618a 792 result = -ENOMEM;
469778c1
JJ		 793 goto out;
794 }
795
d32f6947 796 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
469778c1 797 GFP_KERNEL);
1a7c618a
ZR		 798 if (!br->levels) {
799 result = -ENOMEM;
469778c1 800 goto out_free;
1a7c618a 801 }
469778c1
JJ		 802
803 for (i = 0; i < obj->package.count; i++) {
804 o = (union acpi_object *)&obj->package.elements[i];
805 if (o->type != ACPI_TYPE_INTEGER) {
806 printk(KERN_ERR PREFIX "Invalid data\n");
807 continue;
808 }
bd8ba205
HG		 809 value = (u32) o->integer.value;
810 /* Skip duplicate entries */
811 if (count > 2 && br->levels[count - 1] == value)
812 continue;
813
814 br->levels[count] = value;
469778c1
JJ		 815
816 if (br->levels[count] > max_level)
817 max_level = br->levels[count];
818 count++;
819 }
820
d32f6947
ZR		 821 /*
822 * some buggy BIOS don't export the levels
823 * when machine is on AC/Battery in _BCL package.
824 * In this case, the first two elements in _BCL packages
825 * are also supported brightness levels that OS should take care of.
826 */
90af2cf6
ZR		 827 for (i = 2; i < count; i++) {
828 if (br->levels[i] == br->levels[0])
d32f6947 829 level_ac_battery++;
90af2cf6
ZR		 830 if (br->levels[i] == br->levels[1])
831 level_ac_battery++;
832 }
d32f6947
ZR		 833
834 if (level_ac_battery < 2) {
835 level_ac_battery = 2 - level_ac_battery;
836 br->flags._BCL_no_ac_battery_levels = 1;
837 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
838 br->levels[i] = br->levels[i - level_ac_battery];
839 count += level_ac_battery;
840 } else if (level_ac_battery > 2)
bf6787eb 841 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
d32f6947 842
d80fb99f
ZR		 843 /* Check if the _BCL package is in a reversed order */
844 if (max_level == br->levels[2]) {
845 br->flags._BCL_reversed = 1;
846 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
847 acpi_video_cmp_level, NULL);
848 } else if (max_level != br->levels[count - 1])
849 ACPI_ERROR((AE_INFO,
bf6787eb 850 "Found unordered _BCL package"));
469778c1
JJ		 851
852 br->count = count;
853 device->brightness = br;
1a7c618a 854
1a7c618a 855 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
90c53ca4 856 br->curr = level = max_level;
e047cca6
ZR		 857
858 if (!device->cap._BQC)
859 goto set_level;
860
a89803df
DB		 861 result = acpi_video_device_lcd_get_level_current(device,
862 &level_old, true);
1a7c618a
ZR		 863 if (result)
864 goto out_free_levels;
865
a50188da 866 result = acpi_video_bqc_quirk(device, max_level, level_old);
1a7c618a
ZR		 867 if (result)
868 goto out_free_levels;
a50188da
AL		 869 /*
870 * cap._BQC may get cleared due to _BQC is found to be broken
871 * in acpi_video_bqc_quirk, so check again here.
872 */
873 if (!device->cap._BQC)
874 goto set_level;
e047cca6 875
545ef368
AL		 876 level = acpi_video_bqc_value_to_level(device, level_old);
877 /*
878 * On some buggy laptops, _BQC returns an uninitialized
879 * value when invoked for the first time, i.e.
880 * level_old is invalid (no matter whether it's a level
881 * or an index). Set the backlight to max_level in this case.
882 */
883 for (i = 2; i < br->count; i++)
884 if (level == br->levels[i])
885 break;
886 if (i == br->count || !level)
887 level = max_level;
e047cca6 888
e047cca6 889set_level:
90c53ca4 890 result = acpi_video_device_lcd_set_level(device, level);
e047cca6
ZR		 891 if (result)
892 goto out_free_levels;
1a7c618a 893
d32f6947
ZR		 894 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
895 "found %d brightness levels\n", count - 2));
469778c1 896 kfree(obj);
1a7c618a 897 return result;
469778c1
JJ		 898
899out_free_levels:
900 kfree(br->levels);
901out_free:
902 kfree(br);
903out:
904 device->brightness = NULL;
905 kfree(obj);
1a7c618a 906 return result;
469778c1
JJ		 907}
908
909/*
910 * Arg:
911 * device : video output device (LCD, CRT, ..)
912 *
913 * Return Value:
21fcb34e 914 * None
1da177e4 915 *
98fb8fe1 916 * Find out all required AML methods defined under the output
1da177e4
LT		 917 * device.
918 */
919
4be44fcd 920static void acpi_video_device_find_cap(struct acpi_video_device *device)
1da177e4 921{
952c63e9 922 if (acpi_has_method(device->dev->handle, "_ADR"))
1da177e4 923 device->cap._ADR = 1;
952c63e9 924 if (acpi_has_method(device->dev->handle, "_BCL"))
4be44fcd 925 device->cap._BCL = 1;
952c63e9 926 if (acpi_has_method(device->dev->handle, "_BCM"))
4be44fcd 927 device->cap._BCM = 1;
952c63e9 928 if (acpi_has_method(device->dev->handle, "_BQC")) {
2f3d000a 929 device->cap._BQC = 1;
952c63e9 930 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
c60d638e
ZR		 931 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
932 device->cap._BCQ = 1;
933 }
934
952c63e9 935 if (acpi_has_method(device->dev->handle, "_DDC"))
4be44fcd 936 device->cap._DDC = 1;
1da177e4
LT		 937}
938
939/*
21fcb34e
FC		 940 * Arg:
941 * device : video output device (VGA)
1da177e4
LT		 942 *
943 * Return Value:
21fcb34e 944 * None
1da177e4 945 *
98fb8fe1 946 * Find out all required AML methods defined under the video bus device.
1da177e4
LT		 947 */
948
4be44fcd 949static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1da177e4 950{
952c63e9 951 if (acpi_has_method(video->device->handle, "_DOS"))
1da177e4 952 video->cap._DOS = 1;
952c63e9 953 if (acpi_has_method(video->device->handle, "_DOD"))
1da177e4 954 video->cap._DOD = 1;
952c63e9 955 if (acpi_has_method(video->device->handle, "_ROM"))
1da177e4 956 video->cap._ROM = 1;
952c63e9 957 if (acpi_has_method(video->device->handle, "_GPD"))
1da177e4 958 video->cap._GPD = 1;
952c63e9 959 if (acpi_has_method(video->device->handle, "_SPD"))
1da177e4 960 video->cap._SPD = 1;
952c63e9 961 if (acpi_has_method(video->device->handle, "_VPO"))
1da177e4 962 video->cap._VPO = 1;
1da177e4
LT		 963}
964
965/*
966 * Check whether the video bus device has required AML method to
967 * support the desired features
968 */
969
4be44fcd 970static int acpi_video_bus_check(struct acpi_video_bus *video)
1da177e4 971{
4be44fcd 972 acpi_status status = -ENOENT;
1e4cffe7 973 struct pci_dev *dev;
1da177e4
LT		 974
975 if (!video)
d550d98d 976 return -EINVAL;
1da177e4 977
1e4cffe7 978 dev = acpi_get_pci_dev(video->device->handle);
22c13f9d
TR		 979 if (!dev)
980 return -ENODEV;
1e4cffe7 981 pci_dev_put(dev);
22c13f9d 982
21fcb34e
FC		 983 /*
984 * Since there is no HID, CID and so on for VGA driver, we have
1da177e4
LT		 985 * to check well known required nodes.
986 */
987
98fb8fe1 988 /* Does this device support video switching? */
3a1151e3
SB		 989 if (video->cap._DOS || video->cap._DOD) {
990 if (!video->cap._DOS) {
991 printk(KERN_WARNING FW_BUG
992 "ACPI(%s) defines _DOD but not _DOS\n",
993 acpi_device_bid(video->device));
994 }
1da177e4
LT		 995 video->flags.multihead = 1;
996 status = 0;
997 }
998
98fb8fe1 999 /* Does this device support retrieving a video ROM? */
4be44fcd 1000 if (video->cap._ROM) {
1da177e4
LT		 1001 video->flags.rom = 1;
1002 status = 0;
1003 }
1004
98fb8fe1 1005 /* Does this device support configuring which video device to POST? */
4be44fcd 1006 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1da177e4
LT		 1007 video->flags.post = 1;
1008 status = 0;
1009 }
1010
d550d98d 1011 return status;
1da177e4
LT		 1012}
1013
21fcb34e
FC		 1014/*
1015 * --------------------------------------------------------------------------
1016 * Driver Interface
1017 * --------------------------------------------------------------------------
1018 */
1da177e4
LT		 1019
1020/* device interface */
915ea7e4 1021static struct acpi_video_device_attrib *
82cae999
RZ		 1022acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1023{
78eed028
DT		 1024 struct acpi_video_enumerated_device *ids;
1025 int i;
1026
1027 for (i = 0; i < video->attached_count; i++) {
1028 ids = &video->attached_array[i];
1029 if ((ids->value.int_val & 0xffff) == device_id)
1030 return &ids->value.attrib;
1031 }
82cae999 1032
82cae999
RZ		 1033 return NULL;
1034}
1da177e4 1035
e92a7162
MG		 1036static int
1037acpi_video_get_device_type(struct acpi_video_bus *video,
1038 unsigned long device_id)
1039{
1040 struct acpi_video_enumerated_device *ids;
1041 int i;
1042
1043 for (i = 0; i < video->attached_count; i++) {
1044 ids = &video->attached_array[i];
1045 if ((ids->value.int_val & 0xffff) == device_id)
1046 return ids->value.int_val;
1047 }
1048
1049 return 0;
1050}
1051
1da177e4 1052static int
4be44fcd
LB		 1053acpi_video_bus_get_one_device(struct acpi_device *device,
1054 struct acpi_video_bus *video)
1da177e4 1055{
27663c58 1056 unsigned long long device_id;
e92a7162 1057 int status, device_type;
4be44fcd 1058 struct acpi_video_device *data;
915ea7e4 1059 struct acpi_video_device_attrib *attribute;
1da177e4 1060
4be44fcd
LB		 1061 status =
1062 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
91e13aa3
AL		 1063 /* Some device omits _ADR, we skip them instead of fail */
1064 if (ACPI_FAILURE(status))
1065 return 0;
1da177e4 1066
91e13aa3
AL		 1067 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1068 if (!data)
1069 return -ENOMEM;
82cae999 1070
91e13aa3
AL		 1071 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1072 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1073 device->driver_data = data;
1074
1075 data->device_id = device_id;
1076 data->video = video;
1077 data->dev = device;
8ab58e8e
LT		 1078 INIT_DELAYED_WORK(&data->switch_brightness_work,
1079 acpi_video_switch_brightness);
91e13aa3
AL		 1080
1081 attribute = acpi_video_get_device_attr(video, device_id);
1082
915ea7e4 1083 if (attribute && attribute->device_id_scheme) {
91e13aa3
AL		 1084 switch (attribute->display_type) {
1085 case ACPI_VIDEO_DISPLAY_CRT:
1086 data->flags.crt = 1;
1087 break;
1088 case ACPI_VIDEO_DISPLAY_TV:
1089 data->flags.tvout = 1;
1090 break;
1091 case ACPI_VIDEO_DISPLAY_DVI:
1092 data->flags.dvi = 1;
1093 break;
1094 case ACPI_VIDEO_DISPLAY_LCD:
1095 data->flags.lcd = 1;
1096 break;
1097 default:
1098 data->flags.unknown = 1;
1099 break;
1100 }
915ea7e4 1101 if (attribute->bios_can_detect)
91e13aa3
AL		 1102 data->flags.bios = 1;
1103 } else {
1104 /* Check for legacy IDs */
1105 device_type = acpi_video_get_device_type(video, device_id);
1106 /* Ignore bits 16 and 18-20 */
1107 switch (device_type & 0xffe2ffff) {
915ea7e4
FC		 1108 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1109 data->flags.crt = 1;
1110 break;
1111 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1112 data->flags.lcd = 1;
1113 break;
1114 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1115 data->flags.tvout = 1;
1116 break;
1117 default:
1118 data->flags.unknown = 1;
e92a7162 1119 }
91e13aa3 1120 }
4be44fcd 1121
91e13aa3
AL		 1122 acpi_video_device_bind(video, data);
1123 acpi_video_device_find_cap(data);
1da177e4 1124
91e13aa3
AL		 1125 mutex_lock(&video->device_list_lock);
1126 list_add_tail(&data->entry, &video->video_device_list);
1127 mutex_unlock(&video->device_list_lock);
1da177e4 1128
91e13aa3 1129 return status;
1da177e4
LT		 1130}
1131
1132/*
1133 * Arg:
21fcb34e 1134 * video : video bus device
1da177e4
LT		 1135 *
1136 * Return:
21fcb34e
FC		 1137 * none
1138 *
1139 * Enumerate the video device list of the video bus,
1da177e4
LT		 1140 * bind the ids with the corresponding video devices
1141 * under the video bus.
4be44fcd 1142 */
1da177e4 1143
4be44fcd 1144static void acpi_video_device_rebind(struct acpi_video_bus *video)
1da177e4 1145{
ff102ea9
DT		 1146 struct acpi_video_device *dev;
1147
bbac81f5 1148 mutex_lock(&video->device_list_lock);
ff102ea9
DT		 1149
1150 list_for_each_entry(dev, &video->video_device_list, entry)
4be44fcd 1151 acpi_video_device_bind(video, dev);
ff102ea9 1152
bbac81f5 1153 mutex_unlock(&video->device_list_lock);
1da177e4
LT		 1154}
1155
1156/*
1157 * Arg:
21fcb34e
FC		 1158 * video : video bus device
1159 * device : video output device under the video
1160 * bus
1da177e4
LT		 1161 *
1162 * Return:
21fcb34e
FC		 1163 * none
1164 *
1da177e4
LT		 1165 * Bind the ids with the corresponding video devices
1166 * under the video bus.
4be44fcd 1167 */
1da177e4
LT		 1168
1169static void
4be44fcd
LB		 1170acpi_video_device_bind(struct acpi_video_bus *video,
1171 struct acpi_video_device *device)
1da177e4 1172{
78eed028 1173 struct acpi_video_enumerated_device *ids;
4be44fcd 1174 int i;
1da177e4 1175
78eed028
DT		 1176 for (i = 0; i < video->attached_count; i++) {
1177 ids = &video->attached_array[i];
1178 if (device->device_id == (ids->value.int_val & 0xffff)) {
1179 ids->bind_info = device;
1da177e4
LT		 1180 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1181 }
1182 }
1da177e4
LT		 1183}
1184
0b8db271
AL		 1185static bool acpi_video_device_in_dod(struct acpi_video_device *device)
1186{
1187 struct acpi_video_bus *video = device->video;
1188 int i;
1189
b4df4636
AL		 1190 /*
1191 * If we have a broken _DOD or we have more than 8 output devices
1192 * under the graphics controller node that we can't proper deal with
1193 * in the operation region code currently, no need to test.
1194 */
1195 if (!video->attached_count || video->child_count > 8)
0b8db271
AL		 1196 return true;
1197
1198 for (i = 0; i < video->attached_count; i++) {
35d0565b
AL		 1199 if ((video->attached_array[i].value.int_val & 0xfff) ==
1200 (device->device_id & 0xfff))
0b8db271
AL		 1201 return true;
1202 }
1203
1204 return false;
1205}
1206
1da177e4
LT		 1207/*
1208 * Arg:
21fcb34e 1209 * video : video bus device
1da177e4
LT		 1210 *
1211 * Return:
21fcb34e
FC		 1212 * < 0 : error
1213 *
1da177e4
LT		 1214 * Call _DOD to enumerate all devices attached to display adapter
1215 *
4be44fcd 1216 */
1da177e4
LT		 1217
1218static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1219{
4be44fcd
LB		 1220 int status;
1221 int count;
1222 int i;
78eed028 1223 struct acpi_video_enumerated_device *active_list;
4be44fcd
LB		 1224 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1225 union acpi_object *dod = NULL;
1226 union acpi_object *obj;
1da177e4 1227
90130268 1228 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1da177e4 1229 if (!ACPI_SUCCESS(status)) {
a6fc6720 1230 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
d550d98d 1231 return status;
1da177e4
LT		 1232 }
1233
50dd0969 1234 dod = buffer.pointer;
1da177e4 1235 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
a6fc6720 1236 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1da177e4
LT		 1237 status = -EFAULT;
1238 goto out;
1239 }
1240
1241 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
4be44fcd 1242 dod->package.count));
1da177e4 1243
78eed028
DT		 1244 active_list = kcalloc(1 + dod->package.count,
1245 sizeof(struct acpi_video_enumerated_device),
1246 GFP_KERNEL);
1247 if (!active_list) {
1da177e4
LT		 1248 status = -ENOMEM;
1249 goto out;
1250 }
1251
1252 count = 0;
1253 for (i = 0; i < dod->package.count; i++) {
50dd0969 1254 obj = &dod->package.elements[i];
1da177e4
LT		 1255
1256 if (obj->type != ACPI_TYPE_INTEGER) {
78eed028
DT		 1257 printk(KERN_ERR PREFIX
1258 "Invalid _DOD data in element %d\n", i);
1259 continue;
1da177e4 1260 }
78eed028
DT		 1261
1262 active_list[count].value.int_val = obj->integer.value;
1263 active_list[count].bind_info = NULL;
4be44fcd
LB		 1264 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1265 (int)obj->integer.value));
1da177e4
LT		 1266 count++;
1267 }
1da177e4 1268
6044ec88 1269 kfree(video->attached_array);
4be44fcd 1270
78eed028 1271 video->attached_array = active_list;
1da177e4 1272 video->attached_count = count;
78eed028 1273
915ea7e4 1274out:
02438d87 1275 kfree(buffer.pointer);
d550d98d 1276 return status;
1da177e4
LT		 1277}
1278
4be44fcd
LB		 1279static int
1280acpi_video_get_next_level(struct acpi_video_device *device,
1281 u32 level_current, u32 event)
1da177e4 1282{
63f0edfc 1283 int min, max, min_above, max_below, i, l, delta = 255;
f4715189
TT		 1284 max = max_below = 0;
1285 min = min_above = 255;
63f0edfc 1286 /* Find closest level to level_current */
0a3db1ce 1287 for (i = 2; i < device->brightness->count; i++) {
63f0edfc
AS		 1288 l = device->brightness->levels[i];
1289 if (abs(l - level_current) < abs(delta)) {
1290 delta = l - level_current;
1291 if (!delta)
1292 break;
1293 }
1294 }
1295 /* Ajust level_current to closest available level */
1296 level_current += delta;
0a3db1ce 1297 for (i = 2; i < device->brightness->count; i++) {
f4715189
TT		 1298 l = device->brightness->levels[i];
1299 if (l < min)
1300 min = l;
1301 if (l > max)
1302 max = l;
1303 if (l < min_above && l > level_current)
1304 min_above = l;
1305 if (l > max_below && l < level_current)
1306 max_below = l;
1307 }
1308
1309 switch (event) {
1310 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1311 return (level_current < max) ? min_above : min;
1312 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1313 return (level_current < max) ? min_above : max;
1314 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1315 return (level_current > min) ? max_below : min;
1316 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1317 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1318 return 0;
1319 default:
1320 return level_current;
1321 }
1da177e4
LT		 1322}
1323
8ab58e8e
LT		 1324static void
1325acpi_video_switch_brightness(struct work_struct *work)
1da177e4 1326{
8ab58e8e
LT		 1327 struct acpi_video_device *device = container_of(to_delayed_work(work),
1328 struct acpi_video_device, switch_brightness_work);
27663c58 1329 unsigned long long level_current, level_next;
8ab58e8e 1330 int event = device->switch_brightness_event;
c8890f90
ZR		 1331 int result = -EINVAL;
1332
fbc9fe1b
AL		 1333 /* no warning message if acpi_backlight=vendor or a quirk is used */
1334 if (!acpi_video_verify_backlight_support())
8ab58e8e 1335 return;
28c32e99 1336
469778c1 1337 if (!device->brightness)
c8890f90
ZR		 1338 goto out;
1339
1340 result = acpi_video_device_lcd_get_level_current(device,
a89803df
DB		 1341 &level_current,
1342 false);
c8890f90
ZR		 1343 if (result)
1344 goto out;
1345
1da177e4 1346 level_next = acpi_video_get_next_level(device, level_current, event);
c8890f90 1347
24450c7a 1348 result = acpi_video_device_lcd_set_level(device, level_next);
c8890f90 1349
36342742
MG		 1350 if (!result)
1351 backlight_force_update(device->backlight,
1352 BACKLIGHT_UPDATE_HOTKEY);
1353
c8890f90
ZR		 1354out:
1355 if (result)
1356 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1da177e4
LT		 1357}
1358
e92a7162
MG		 1359int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1360 void **edid)
1361{
1362 struct acpi_video_bus *video;
1363 struct acpi_video_device *video_device;
1364 union acpi_object *buffer = NULL;
1365 acpi_status status;
1366 int i, length;
1367
1368 if (!device || !acpi_driver_data(device))
1369 return -EINVAL;
1370
1371 video = acpi_driver_data(device);
1372
1373 for (i = 0; i < video->attached_count; i++) {
1374 video_device = video->attached_array[i].bind_info;
1375 length = 256;
1376
1377 if (!video_device)
1378 continue;
1379
82069552
ZR		 1380 if (!video_device->cap._DDC)
1381 continue;
1382
e92a7162
MG		 1383 if (type) {
1384 switch (type) {
1385 case ACPI_VIDEO_DISPLAY_CRT:
1386 if (!video_device->flags.crt)
1387 continue;
1388 break;
1389 case ACPI_VIDEO_DISPLAY_TV:
1390 if (!video_device->flags.tvout)
1391 continue;
1392 break;
1393 case ACPI_VIDEO_DISPLAY_DVI:
1394 if (!video_device->flags.dvi)
1395 continue;
1396 break;
1397 case ACPI_VIDEO_DISPLAY_LCD:
1398 if (!video_device->flags.lcd)
1399 continue;
1400 break;
1401 }
1402 } else if (video_device->device_id != device_id) {
1403 continue;
1404 }
1405
1406 status = acpi_video_device_EDID(video_device, &buffer, length);
1407
1408 if (ACPI_FAILURE(status) || !buffer ||
1409 buffer->type != ACPI_TYPE_BUFFER) {
1410 length = 128;
1411 status = acpi_video_device_EDID(video_device, &buffer,
1412 length);
1413 if (ACPI_FAILURE(status) || !buffer ||
1414 buffer->type != ACPI_TYPE_BUFFER) {
1415 continue;
1416 }
1417 }
1418
1419 *edid = buffer->buffer.pointer;
1420 return length;
1421 }
1422
1423 return -ENODEV;
1424}
1425EXPORT_SYMBOL(acpi_video_get_edid);
1426
1da177e4 1427static int
4be44fcd
LB		 1428acpi_video_bus_get_devices(struct acpi_video_bus *video,
1429 struct acpi_device *device)
1da177e4 1430{
fba4e087 1431 int status = 0;
ff102ea9 1432 struct acpi_device *dev;
1da177e4 1433
fba4e087
IM		 1434 /*
1435 * There are systems where video module known to work fine regardless
1436 * of broken _DOD and ignoring returned value here doesn't cause
1437 * any issues later.
1438 */
1439 acpi_video_device_enumerate(video);
1da177e4 1440
ff102ea9 1441 list_for_each_entry(dev, &device->children, node) {
1da177e4
LT		 1442
1443 status = acpi_video_bus_get_one_device(dev, video);
ea9f8856 1444 if (status) {
91e13aa3
AL		 1445 dev_err(&dev->dev, "Can't attach device\n");
1446 break;
1da177e4 1447 }
b4df4636 1448 video->child_count++;
1da177e4 1449 }
d550d98d 1450 return status;
1da177e4
LT		 1451}
1452
1da177e4
LT		 1453/* acpi_video interface */
1454
efaa14c7
AL		 1455/*
1456 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1457 * preform any automatic brightness change on receiving a notification.
1458 */
4be44fcd 1459static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1da177e4 1460{
efaa14c7 1461 return acpi_video_bus_DOS(video, 0,
fbc9fe1b 1462 acpi_osi_is_win8() ? 1 : 0);
1da177e4
LT		 1463}
1464
4be44fcd 1465static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1da177e4 1466{
efaa14c7 1467 return acpi_video_bus_DOS(video, 0,
fbc9fe1b 1468 acpi_osi_is_win8() ? 0 : 1);
1da177e4
LT		 1469}
1470
7015558f 1471static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1da177e4 1472{
7015558f 1473 struct acpi_video_bus *video = acpi_driver_data(device);
e9dab196 1474 struct input_dev *input;
17c452f9 1475 int keycode = 0;
e9dab196 1476
67b662e1 1477 if (!video || !video->input)
d550d98d 1478 return;
1da177e4 1479
e9dab196 1480 input = video->input;
1da177e4
LT		 1481
1482 switch (event) {
98fb8fe1 1483 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1da177e4 1484 * most likely via hotkey. */
8a37c65d 1485 keycode = KEY_SWITCHVIDEOMODE;
1da177e4
LT		 1486 break;
1487
98fb8fe1 1488 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1da177e4
LT		 1489 * connector. */
1490 acpi_video_device_enumerate(video);
1491 acpi_video_device_rebind(video);
e9dab196 1492 keycode = KEY_SWITCHVIDEOMODE;
1da177e4
LT		 1493 break;
1494
4be44fcd 1495 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
e9dab196
LY		 1496 keycode = KEY_SWITCHVIDEOMODE;
1497 break;
4be44fcd 1498 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
e9dab196
LY		 1499 keycode = KEY_VIDEO_NEXT;
1500 break;
4be44fcd 1501 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
e9dab196 1502 keycode = KEY_VIDEO_PREV;
1da177e4
LT		 1503 break;
1504
1505 default:
1506 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
4be44fcd 1507 "Unsupported event [0x%x]\n", event));
1da177e4
LT		 1508 break;
1509 }
1510
8a37c65d
LT		 1511 if (acpi_notifier_call_chain(device, event, 0))
1512 /* Something vetoed the keypress. */
1513 keycode = 0;
17c452f9
MG		 1514
1515 if (keycode) {
1516 input_report_key(input, keycode, 1);
1517 input_sync(input);
1518 input_report_key(input, keycode, 0);
1519 input_sync(input);
1520 }
e9dab196 1521
d550d98d 1522 return;
1da177e4
LT		 1523}
1524
8ab58e8e
LT		 1525static void brightness_switch_event(struct acpi_video_device *video_device,
1526 u32 event)
1527{
1528 if (!brightness_switch_enabled)
1529 return;
1530
1531 video_device->switch_brightness_event = event;
1532 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1533}
1534
4be44fcd 1535static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1da177e4 1536{
50dd0969 1537 struct acpi_video_device *video_device = data;
4be44fcd 1538 struct acpi_device *device = NULL;
e9dab196
LY		 1539 struct acpi_video_bus *bus;
1540 struct input_dev *input;
17c452f9 1541 int keycode = 0;
1da177e4 1542
1da177e4 1543 if (!video_device)
d550d98d 1544 return;
1da177e4 1545
e6afa0de 1546 device = video_device->dev;
e9dab196
LY		 1547 bus = video_device->video;
1548 input = bus->input;
1da177e4
LT		 1549
1550 switch (event) {
4be44fcd 1551 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
8ab58e8e 1552 brightness_switch_event(video_device, event);
e9dab196
LY		 1553 keycode = KEY_BRIGHTNESS_CYCLE;
1554 break;
4be44fcd 1555 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
8ab58e8e 1556 brightness_switch_event(video_device, event);
e9dab196
LY		 1557 keycode = KEY_BRIGHTNESSUP;
1558 break;
4be44fcd 1559 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
8ab58e8e 1560 brightness_switch_event(video_device, event);
e9dab196
LY		 1561 keycode = KEY_BRIGHTNESSDOWN;
1562 break;
70f23fd6 1563 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
8ab58e8e 1564 brightness_switch_event(video_device, event);
e9dab196
LY		 1565 keycode = KEY_BRIGHTNESS_ZERO;
1566 break;
4be44fcd 1567 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
8ab58e8e 1568 brightness_switch_event(video_device, event);
e9dab196 1569 keycode = KEY_DISPLAY_OFF;
1da177e4
LT		 1570 break;
1571 default:
1572 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
4be44fcd 1573 "Unsupported event [0x%x]\n", event));
1da177e4
LT		 1574 break;
1575 }
e9dab196 1576
7761f638 1577 acpi_notifier_call_chain(device, event, 0);
17c452f9
MG		 1578
1579 if (keycode) {
1580 input_report_key(input, keycode, 1);
1581 input_sync(input);
1582 input_report_key(input, keycode, 0);
1583 input_sync(input);
1584 }
e9dab196 1585
d550d98d 1586 return;
1da177e4
LT		 1587}
1588
ac7729da
RW		 1589static int acpi_video_resume(struct notifier_block *nb,
1590 unsigned long val, void *ign)
863c1490
MG		 1591{
1592 struct acpi_video_bus *video;
1593 struct acpi_video_device *video_device;
1594 int i;
1595
ac7729da
RW		 1596 switch (val) {
1597 case PM_HIBERNATION_PREPARE:
1598 case PM_SUSPEND_PREPARE:
1599 case PM_RESTORE_PREPARE:
1600 return NOTIFY_DONE;
1601 }
863c1490 1602
ac7729da
RW		 1603 video = container_of(nb, struct acpi_video_bus, pm_nb);
1604
1605 dev_info(&video->device->dev, "Restoring backlight state\n");
863c1490
MG		 1606
1607 for (i = 0; i < video->attached_count; i++) {
1608 video_device = video->attached_array[i].bind_info;
1609 if (video_device && video_device->backlight)
1610 acpi_video_set_brightness(video_device->backlight);
1611 }
ac7729da
RW		 1612
1613 return NOTIFY_OK;
863c1490
MG		 1614}
1615
c504f8cb
ZR		 1616static acpi_status
1617acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1618 void **return_value)
1619{
1620 struct acpi_device *device = context;
1621 struct acpi_device *sibling;
1622 int result;
1623
1624 if (handle == device->handle)
1625 return AE_CTRL_TERMINATE;
1626
1627 result = acpi_bus_get_device(handle, &sibling);
1628 if (result)
1629 return AE_OK;
1630
1631 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1632 return AE_ALREADY_EXISTS;
1633
1634 return AE_OK;
1635}
1636
67b662e1
AL		 1637static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1638{
99678ed7
HG		 1639 struct backlight_properties props;
1640 struct pci_dev *pdev;
1641 acpi_handle acpi_parent;
1642 struct device *parent = NULL;
1643 int result;
1644 static int count;
1645 char *name;
67b662e1 1646
0b8db271
AL		 1647 /*
1648 * Do not create backlight device for video output
1649 * device that is not in the enumerated list.
1650 */
1651 if (!acpi_video_device_in_dod(device)) {
1652 dev_dbg(&device->dev->dev, "not in _DOD list, ignore\n");
1653 return;
1654 }
1655
99678ed7
HG		 1656 result = acpi_video_init_brightness(device);
1657 if (result)
1658 return;
1659 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1660 if (!name)
1661 return;
1662 count++;
67b662e1 1663
99678ed7 1664 acpi_get_parent(device->dev->handle, &acpi_parent);
67b662e1 1665
99678ed7
HG		 1666 pdev = acpi_get_pci_dev(acpi_parent);
1667 if (pdev) {
1668 parent = &pdev->dev;
1669 pci_dev_put(pdev);
1670 }
67b662e1 1671
99678ed7
HG		 1672 memset(&props, 0, sizeof(struct backlight_properties));
1673 props.type = BACKLIGHT_FIRMWARE;
1674 props.max_brightness = device->brightness->count - 3;
1675 device->backlight = backlight_device_register(name,
1676 parent,
1677 device,
1678 &acpi_backlight_ops,
1679 &props);
1680 kfree(name);
1681 if (IS_ERR(device->backlight))
1682 return;
67b662e1 1683
99678ed7
HG		 1684 /*
1685 * Save current brightness level in case we have to restore it
1686 * before acpi_video_device_lcd_set_level() is called next time.
1687 */
1688 device->backlight->props.brightness =
1689 acpi_video_get_brightness(device->backlight);
67b662e1 1690
99678ed7
HG		 1691 device->cooling_dev = thermal_cooling_device_register("LCD",
1692 device->dev, &video_cooling_ops);
1693 if (IS_ERR(device->cooling_dev)) {
1694 /*
1695 * Set cooling_dev to NULL so we don't crash trying to free it.
1696 * Also, why the hell we are returning early and not attempt to
1697 * register video output if cooling device registration failed?
1698 * -- dtor
1699 */
1700 device->cooling_dev = NULL;
1701 return;
67b662e1 1702 }
99678ed7
HG		 1703
1704 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1705 device->cooling_dev->id);
1706 result = sysfs_create_link(&device->dev->dev.kobj,
1707 &device->cooling_dev->device.kobj,
1708 "thermal_cooling");
1709 if (result)
1710 printk(KERN_ERR PREFIX "Create sysfs link\n");
1711 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1712 &device->dev->dev.kobj, "device");
1713 if (result)
1714 printk(KERN_ERR PREFIX "Create sysfs link\n");
67b662e1
AL		 1715}
1716
dce4ec2e
AL		 1717static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)
1718{
1719 struct acpi_video_device *dev;
1720 union acpi_object *levels;
1721
1722 mutex_lock(&video->device_list_lock);
1723 list_for_each_entry(dev, &video->video_device_list, entry) {
1724 if (!acpi_video_device_lcd_query_levels(dev, &levels))
1725 kfree(levels);
1726 }
1727 mutex_unlock(&video->device_list_lock);
1728}
1729
67b662e1
AL		 1730static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1731{
1732 struct acpi_video_device *dev;
1733
53a92ba7
HG		 1734 if (video->backlight_registered)
1735 return 0;
1736
dce4ec2e
AL		 1737 acpi_video_run_bcl_for_osi(video);
1738
99678ed7
HG		 1739 if (!acpi_video_verify_backlight_support())
1740 return 0;
1741
67b662e1
AL		 1742 mutex_lock(&video->device_list_lock);
1743 list_for_each_entry(dev, &video->video_device_list, entry)
1744 acpi_video_dev_register_backlight(dev);
1745 mutex_unlock(&video->device_list_lock);
1746
99678ed7
HG		 1747 video->backlight_registered = true;
1748
67b662e1
AL		 1749 video->pm_nb.notifier_call = acpi_video_resume;
1750 video->pm_nb.priority = 0;
1751 return register_pm_notifier(&video->pm_nb);
1752}
1753
1754static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1755{
1756 if (device->backlight) {
1757 backlight_device_unregister(device->backlight);
1758 device->backlight = NULL;
1759 }
1760 if (device->brightness) {
1761 kfree(device->brightness->levels);
1762 kfree(device->brightness);
1763 device->brightness = NULL;
1764 }
1765 if (device->cooling_dev) {
1766 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1767 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1768 thermal_cooling_device_unregister(device->cooling_dev);
1769 device->cooling_dev = NULL;
1770 }
1771}
1772
1773static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1774{
1775 struct acpi_video_device *dev;
99678ed7
HG		 1776 int error;
1777
1778 if (!video->backlight_registered)
1779 return 0;
1780
1781 error = unregister_pm_notifier(&video->pm_nb);
67b662e1
AL		 1782
1783 mutex_lock(&video->device_list_lock);
1784 list_for_each_entry(dev, &video->video_device_list, entry)
1785 acpi_video_dev_unregister_backlight(dev);
1786 mutex_unlock(&video->device_list_lock);
1787
99678ed7
HG		 1788 video->backlight_registered = false;
1789
67b662e1
AL		 1790 return error;
1791}
1792
1793static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1794{
1795 acpi_status status;
1796 struct acpi_device *adev = device->dev;
1797
1798 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1799 acpi_video_device_notify, device);
1800 if (ACPI_FAILURE(status))
1801 dev_err(&adev->dev, "Error installing notify handler\n");
1802 else
1803 device->flags.notify = 1;
1804}
1805
1806static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1807{
1808 struct input_dev *input;
1809 struct acpi_video_device *dev;
1810 int error;
1811
1812 video->input = input = input_allocate_device();
1813 if (!input) {
1814 error = -ENOMEM;
1815 goto out;
1816 }
1817
1818 error = acpi_video_bus_start_devices(video);
1819 if (error)
1820 goto err_free_input;
1821
1822 snprintf(video->phys, sizeof(video->phys),
1823 "%s/video/input0", acpi_device_hid(video->device));
1824
1825 input->name = acpi_device_name(video->device);
1826 input->phys = video->phys;
1827 input->id.bustype = BUS_HOST;
1828 input->id.product = 0x06;
1829 input->dev.parent = &video->device->dev;
1830 input->evbit[0] = BIT(EV_KEY);
1831 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1832 set_bit(KEY_VIDEO_NEXT, input->keybit);
1833 set_bit(KEY_VIDEO_PREV, input->keybit);
1834 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1835 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1836 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1837 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1838 set_bit(KEY_DISPLAY_OFF, input->keybit);
1839
1840 error = input_register_device(input);
1841 if (error)
1842 goto err_stop_dev;
1843
1844 mutex_lock(&video->device_list_lock);
1845 list_for_each_entry(dev, &video->video_device_list, entry)
1846 acpi_video_dev_add_notify_handler(dev);
1847 mutex_unlock(&video->device_list_lock);
1848
1849 return 0;
1850
1851err_stop_dev:
1852 acpi_video_bus_stop_devices(video);
1853err_free_input:
1854 input_free_device(input);
1855 video->input = NULL;
1856out:
1857 return error;
1858}
1859
1860static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1861{
1862 if (dev->flags.notify) {
1863 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1864 acpi_video_device_notify);
1865 dev->flags.notify = 0;
1866 }
1867}
1868
1869static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1870{
1871 struct acpi_video_device *dev;
1872
1873 mutex_lock(&video->device_list_lock);
1874 list_for_each_entry(dev, &video->video_device_list, entry)
1875 acpi_video_dev_remove_notify_handler(dev);
1876 mutex_unlock(&video->device_list_lock);
1877
1878 acpi_video_bus_stop_devices(video);
1879 input_unregister_device(video->input);
1880 video->input = NULL;
1881}
1882
53a92ba7
HG		 1883static int acpi_video_backlight_notify(struct notifier_block *nb,
1884 unsigned long val, void *bd)
1885{
1886 struct backlight_device *backlight = bd;
1887 struct acpi_video_bus *video;
1888
1889 /* acpi_video_verify_backlight_support only cares about raw devices */
1890 if (backlight->props.type != BACKLIGHT_RAW)
1891 return NOTIFY_DONE;
1892
1893 video = container_of(nb, struct acpi_video_bus, backlight_nb);
1894
1895 switch (val) {
1896 case BACKLIGHT_REGISTERED:
1897 if (!acpi_video_verify_backlight_support())
1898 acpi_video_bus_unregister_backlight(video);
1899 break;
1900 case BACKLIGHT_UNREGISTERED:
1901 acpi_video_bus_register_backlight(video);
1902 break;
1903 }
1904
1905 return NOTIFY_OK;
1906}
1907
1908static int acpi_video_bus_add_backlight_notify_handler(
1909 struct acpi_video_bus *video)
1910{
1911 int error;
1912
1913 video->backlight_nb.notifier_call = acpi_video_backlight_notify;
1914 video->backlight_nb.priority = 0;
1915 error = backlight_register_notifier(&video->backlight_nb);
1916 if (error == 0)
1917 video->backlight_notifier_registered = true;
1918
1919 return error;
1920}
1921
1922static int acpi_video_bus_remove_backlight_notify_handler(
1923 struct acpi_video_bus *video)
1924{
1925 if (!video->backlight_notifier_registered)
1926 return 0;
1927
1928 video->backlight_notifier_registered = false;
1929
1930 return backlight_unregister_notifier(&video->backlight_nb);
1931}
1932
67b662e1
AL		 1933static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1934{
1935 struct acpi_video_device *dev, *next;
1936
1937 mutex_lock(&video->device_list_lock);
1938 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1939 list_del(&dev->entry);
1940 kfree(dev);
1941 }
1942 mutex_unlock(&video->device_list_lock);
1943
1944 return 0;
1945}
1946
ac7729da
RW		 1947static int instance;
1948
4be44fcd 1949static int acpi_video_bus_add(struct acpi_device *device)
1da177e4 1950{
f51e8391 1951 struct acpi_video_bus *video;
f51e8391 1952 int error;
c504f8cb
ZR		 1953 acpi_status status;
1954
1955 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1956 device->parent->handle, 1,
1957 acpi_video_bus_match, NULL,
1958 device, NULL);
1959 if (status == AE_ALREADY_EXISTS) {
1960 printk(KERN_WARNING FW_BUG
1961 "Duplicate ACPI video bus devices for the"
1962 " same VGA controller, please try module "
1963 "parameter \"video.allow_duplicates=1\""
1964 "if the current driver doesn't work.\n");
1965 if (!allow_duplicates)
1966 return -ENODEV;
1967 }
1da177e4 1968
36bcbec7 1969 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1da177e4 1970 if (!video)
d550d98d 1971 return -ENOMEM;
1da177e4 1972
e6d9da1d
ZR		 1973 /* a hack to fix the duplicate name "VID" problem on T61 */
1974 if (!strcmp(device->pnp.bus_id, "VID")) {
1975 if (instance)
1976 device->pnp.bus_id[3] = '0' + instance;
915ea7e4 1977 instance++;
e6d9da1d 1978 }
f3b39f13
ZY		 1979 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1980 if (!strcmp(device->pnp.bus_id, "VGA")) {
1981 if (instance)
1982 device->pnp.bus_id[3] = '0' + instance;
1983 instance++;
1984 }
e6d9da1d 1985
e6afa0de 1986 video->device = device;
1da177e4
LT		 1987 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1988 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
db89b4f0 1989 device->driver_data = video;
1da177e4
LT		 1990
1991 acpi_video_bus_find_cap(video);
f51e8391
DT		 1992 error = acpi_video_bus_check(video);
1993 if (error)
1994 goto err_free_video;
1da177e4 1995
bbac81f5 1996 mutex_init(&video->device_list_lock);
1da177e4
LT		 1997 INIT_LIST_HEAD(&video->video_device_list);
1998
ea9f8856
IM		 1999 error = acpi_video_bus_get_devices(video, device);
2000 if (error)
91e13aa3 2001 goto err_put_video;
1da177e4 2002
1da177e4 2003 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
4be44fcd
LB		 2004 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2005 video->flags.multihead ? "yes" : "no",
2006 video->flags.rom ? "yes" : "no",
2007 video->flags.post ? "yes" : "no");
67b662e1
AL		 2008 mutex_lock(&video_list_lock);
2009 list_add_tail(&video->entry, &video_bus_head);
2010 mutex_unlock(&video_list_lock);
1da177e4 2011
67b662e1
AL		 2012 acpi_video_bus_register_backlight(video);
2013 acpi_video_bus_add_notify_handler(video);
53a92ba7 2014 acpi_video_bus_add_backlight_notify_handler(video);
ac7729da 2015
f51e8391
DT		 2016 return 0;
2017
67b662e1 2018err_put_video:
f51e8391
DT		 2019 acpi_video_bus_put_devices(video);
2020 kfree(video->attached_array);
67b662e1 2021err_free_video:
f51e8391 2022 kfree(video);
db89b4f0 2023 device->driver_data = NULL;
1da177e4 2024
f51e8391 2025 return error;
1da177e4
LT		 2026}
2027
51fac838 2028static int acpi_video_bus_remove(struct acpi_device *device)
1da177e4 2029{
4be44fcd 2030 struct acpi_video_bus *video = NULL;
1da177e4 2031
1da177e4
LT		 2032
2033 if (!device || !acpi_driver_data(device))
d550d98d 2034 return -EINVAL;
1da177e4 2035
50dd0969 2036 video = acpi_driver_data(device);
1da177e4 2037
53a92ba7 2038 acpi_video_bus_remove_backlight_notify_handler(video);
67b662e1
AL		 2039 acpi_video_bus_remove_notify_handler(video);
2040 acpi_video_bus_unregister_backlight(video);
1da177e4 2041 acpi_video_bus_put_devices(video);
1da177e4 2042
67b662e1
AL		 2043 mutex_lock(&video_list_lock);
2044 list_del(&video->entry);
2045 mutex_unlock(&video_list_lock);
2046
6044ec88 2047 kfree(video->attached_array);
1da177e4
LT		 2048 kfree(video);
2049
d550d98d 2050 return 0;
1da177e4
LT		 2051}
2052
c6996bdd
AC		 2053static int __init is_i740(struct pci_dev *dev)
2054{
2055 if (dev->device == 0x00D1)
2056 return 1;
2057 if (dev->device == 0x7000)
2058 return 1;
2059 return 0;
2060}
2061
74a365b3
MG		 2062static int __init intel_opregion_present(void)
2063{
c6996bdd 2064 int opregion = 0;
74a365b3
MG		 2065 struct pci_dev *dev = NULL;
2066 u32 address;
2067
2068 for_each_pci_dev(dev) {
2069 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2070 continue;
2071 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2072 continue;
c6996bdd
AC		 2073 /* We don't want to poke around undefined i740 registers */
2074 if (is_i740(dev))
2075 continue;
74a365b3
MG		 2076 pci_read_config_dword(dev, 0xfc, &address);
2077 if (!address)
2078 continue;
c6996bdd 2079 opregion = 1;
74a365b3 2080 }
c6996bdd 2081 return opregion;
74a365b3
MG		 2082}
2083
8e5c2b77 2084int acpi_video_register(void)
1da177e4 2085{
8e5c2b77 2086 int result = 0;
86e437f0
ZY		 2087 if (register_count) {
2088 /*
8e5c2b77
RW		 2089 * if the function of acpi_video_register is already called,
2090 * don't register the acpi_vide_bus again and return no error.
86e437f0
ZY		 2091 */
2092 return 0;
2093 }
1da177e4 2094
67b662e1
AL		 2095 mutex_init(&video_list_lock);
2096 INIT_LIST_HEAD(&video_bus_head);
2097
1da177e4 2098 result = acpi_bus_register_driver(&acpi_video_bus);
39fe394d 2099 if (result < 0)
d550d98d 2100 return -ENODEV;
1da177e4 2101
86e437f0
ZY		 2102 /*
2103 * When the acpi_video_bus is loaded successfully, increase
2104 * the counter reference.
2105 */
2106 register_count = 1;
2107
d550d98d 2108 return 0;
1da177e4 2109}
8e5c2b77 2110EXPORT_SYMBOL(acpi_video_register);
74a365b3 2111
86e437f0
ZY		 2112void acpi_video_unregister(void)
2113{
2114 if (!register_count) {
2115 /*
2116 * If the acpi video bus is already unloaded, don't
2117 * unload it again and return directly.
2118 */
2119 return;
2120 }
2121 acpi_bus_unregister_driver(&acpi_video_bus);
2122
86e437f0
ZY		 2123 register_count = 0;
2124
2125 return;
2126}
2127EXPORT_SYMBOL(acpi_video_unregister);
2128
1b7f37e1
HG		 2129void acpi_video_unregister_backlight(void)
2130{
2131 struct acpi_video_bus *video;
2132
2133 if (!register_count)
2134 return;
2135
2136 mutex_lock(&video_list_lock);
2137 list_for_each_entry(video, &video_bus_head, entry)
2138 acpi_video_bus_unregister_backlight(video);
2139 mutex_unlock(&video_list_lock);
2140}
2141EXPORT_SYMBOL(acpi_video_unregister_backlight);
2142
74a365b3
MG		 2143/*
2144 * This is kind of nasty. Hardware using Intel chipsets may require
2145 * the video opregion code to be run first in order to initialise
2146 * state before any ACPI video calls are made. To handle this we defer
2147 * registration of the video class until the opregion code has run.
2148 */
2149
2150static int __init acpi_video_init(void)
2151{
45cb50e6
ZR		 2152 dmi_check_system(video_dmi_table);
2153
74a365b3
MG		 2154 if (intel_opregion_present())
2155 return 0;
2156
2157 return acpi_video_register();
2158}
1da177e4 2159
86e437f0 2160static void __exit acpi_video_exit(void)
1da177e4 2161{
86e437f0 2162 acpi_video_unregister();
1da177e4 2163
d550d98d 2164 return;
1da177e4
LT		 2165}
2166
2167module_init(acpi_video_init);
2168module_exit(acpi_video_exit);
Linux kernel - Deliverables
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