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Merge tag 'block-5.11-2021-01-10' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / acpi / acpi_video.c
bloba322a7bd286ba6a05b484a23358e5ee19622033b
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * video.c - ACPI Video Driver
4 *
5 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
6 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
7 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
8 */
9
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/types.h>
14 #include <linux/list.h>
15 #include <linux/mutex.h>
16 #include <linux/input.h>
17 #include <linux/backlight.h>
18 #include <linux/thermal.h>
19 #include <linux/sort.h>
20 #include <linux/pci.h>
21 #include <linux/pci_ids.h>
22 #include <linux/slab.h>
23 #include <linux/dmi.h>
24 #include <linux/suspend.h>
25 #include <linux/acpi.h>
26 #include <acpi/video.h>
27 #include <linux/uaccess.h>
28
29 #define PREFIX "ACPI: "
30
31 #define ACPI_VIDEO_BUS_NAME "Video Bus"
32 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
33
34 #define MAX_NAME_LEN 20
35
36 #define _COMPONENT ACPI_VIDEO_COMPONENT
37 ACPI_MODULE_NAME("video");
38
39 MODULE_AUTHOR("Bruno Ducrot");
40 MODULE_DESCRIPTION("ACPI Video Driver");
41 MODULE_LICENSE("GPL");
42
43 static bool brightness_switch_enabled = true;
44 module_param(brightness_switch_enabled, bool, 0644);
45
46 /*
47 * By default, we don't allow duplicate ACPI video bus devices
48 * under the same VGA controller
49 */
50 static bool allow_duplicates;
51 module_param(allow_duplicates, bool, 0644);
52
53 static int disable_backlight_sysfs_if = -1;
54 module_param(disable_backlight_sysfs_if, int, 0444);
55
56 #define REPORT_OUTPUT_KEY_EVENTS 0x01
57 #define REPORT_BRIGHTNESS_KEY_EVENTS 0x02
58 static int report_key_events = -1;
59 module_param(report_key_events, int, 0644);
60 MODULE_PARM_DESC(report_key_events,
61 "0: none, 1: output changes, 2: brightness changes, 3: all");
62
63 static int hw_changes_brightness = -1;
64 module_param(hw_changes_brightness, int, 0644);
65 MODULE_PARM_DESC(hw_changes_brightness,
66 "Set this to 1 on buggy hw which changes the brightness itself when "
67 "a hotkey is pressed: -1: auto, 0: normal 1: hw-changes-brightness");
68
69 /*
70 * Whether the struct acpi_video_device_attrib::device_id_scheme bit should be
71 * assumed even if not actually set.
72 */
73 static bool device_id_scheme = false;
74 module_param(device_id_scheme, bool, 0444);
75
76 static int only_lcd = -1;
77 module_param(only_lcd, int, 0444);
78
79 static int register_count;
80 static DEFINE_MUTEX(register_count_mutex);
81 static DEFINE_MUTEX(video_list_lock);
82 static LIST_HEAD(video_bus_head);
83 static int acpi_video_bus_add(struct acpi_device *device);
84 static int acpi_video_bus_remove(struct acpi_device *device);
85 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
86 void acpi_video_detect_exit(void);
87
88 /*
89 * Indices in the _BCL method response: the first two items are special,
90 * the rest are all supported levels.
91 *
92 * See page 575 of the ACPI spec 3.0
93 */
94 enum acpi_video_level_idx {
95 ACPI_VIDEO_AC_LEVEL, /* level when machine has full power */
96 ACPI_VIDEO_BATTERY_LEVEL, /* level when machine is on batteries */
97 ACPI_VIDEO_FIRST_LEVEL, /* actual supported levels begin here */
98 };
99
100 static const struct acpi_device_id video_device_ids[] = {
101 {ACPI_VIDEO_HID, 0},
102 {"", 0},
103 };
104 MODULE_DEVICE_TABLE(acpi, video_device_ids);
105
106 static struct acpi_driver acpi_video_bus = {
107 .name = "video",
108 .class = ACPI_VIDEO_CLASS,
109 .ids = video_device_ids,
110 .ops = {
111 .add = acpi_video_bus_add,
112 .remove = acpi_video_bus_remove,
113 .notify = acpi_video_bus_notify,
114 },
115 };
116
117 struct acpi_video_bus_flags {
118 u8 multihead:1; /* can switch video heads */
119 u8 rom:1; /* can retrieve a video rom */
120 u8 post:1; /* can configure the head to */
121 u8 reserved:5;
122 };
123
124 struct acpi_video_bus_cap {
125 u8 _DOS:1; /* Enable/Disable output switching */
126 u8 _DOD:1; /* Enumerate all devices attached to display adapter */
127 u8 _ROM:1; /* Get ROM Data */
128 u8 _GPD:1; /* Get POST Device */
129 u8 _SPD:1; /* Set POST Device */
130 u8 _VPO:1; /* Video POST Options */
131 u8 reserved:2;
132 };
133
134 struct acpi_video_device_attrib {
135 u32 display_index:4; /* A zero-based instance of the Display */
136 u32 display_port_attachment:4; /* This field differentiates the display type */
137 u32 display_type:4; /* Describe the specific type in use */
138 u32 vendor_specific:4; /* Chipset Vendor Specific */
139 u32 bios_can_detect:1; /* BIOS can detect the device */
140 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
141 the VGA device. */
142 u32 pipe_id:3; /* For VGA multiple-head devices. */
143 u32 reserved:10; /* Must be 0 */
144
145 /*
146 * The device ID might not actually follow the scheme described by this
147 * struct acpi_video_device_attrib. If it does, then this bit
148 * device_id_scheme is set; otherwise, other fields should be ignored.
149 *
150 * (but also see the global flag device_id_scheme)
151 */
152 u32 device_id_scheme:1;
153 };
154
155 struct acpi_video_enumerated_device {
156 union {
157 u32 int_val;
158 struct acpi_video_device_attrib attrib;
159 } value;
160 struct acpi_video_device *bind_info;
161 };
162
163 struct acpi_video_bus {
164 struct acpi_device *device;
165 bool backlight_registered;
166 u8 dos_setting;
167 struct acpi_video_enumerated_device *attached_array;
168 u8 attached_count;
169 u8 child_count;
170 struct acpi_video_bus_cap cap;
171 struct acpi_video_bus_flags flags;
172 struct list_head video_device_list;
173 struct mutex device_list_lock; /* protects video_device_list */
174 struct list_head entry;
175 struct input_dev *input;
176 char phys[32]; /* for input device */
177 struct notifier_block pm_nb;
178 };
179
180 struct acpi_video_device_flags {
181 u8 crt:1;
182 u8 lcd:1;
183 u8 tvout:1;
184 u8 dvi:1;
185 u8 bios:1;
186 u8 unknown:1;
187 u8 notify:1;
188 u8 reserved:1;
189 };
190
191 struct acpi_video_device_cap {
192 u8 _ADR:1; /* Return the unique ID */
193 u8 _BCL:1; /* Query list of brightness control levels supported */
194 u8 _BCM:1; /* Set the brightness level */
195 u8 _BQC:1; /* Get current brightness level */
196 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
197 u8 _DDC:1; /* Return the EDID for this device */
198 };
199
200 struct acpi_video_device {
201 unsigned long device_id;
202 struct acpi_video_device_flags flags;
203 struct acpi_video_device_cap cap;
204 struct list_head entry;
205 struct delayed_work switch_brightness_work;
206 int switch_brightness_event;
207 struct acpi_video_bus *video;
208 struct acpi_device *dev;
209 struct acpi_video_device_brightness *brightness;
210 struct backlight_device *backlight;
211 struct thermal_cooling_device *cooling_dev;
212 };
213
214 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
215 static void acpi_video_device_rebind(struct acpi_video_bus *video);
216 static void acpi_video_device_bind(struct acpi_video_bus *video,
217 struct acpi_video_device *device);
218 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
219 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
220 int level);
221 static int acpi_video_device_lcd_get_level_current(
222 struct acpi_video_device *device,
223 unsigned long long *level, bool raw);
224 static int acpi_video_get_next_level(struct acpi_video_device *device,
225 u32 level_current, u32 event);
226 static void acpi_video_switch_brightness(struct work_struct *work);
227
228 /* backlight device sysfs support */
229 static int acpi_video_get_brightness(struct backlight_device *bd)
230 {
231 unsigned long long cur_level;
232 int i;
233 struct acpi_video_device *vd = bl_get_data(bd);
234
235 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
236 return -EINVAL;
237 for (i = ACPI_VIDEO_FIRST_LEVEL; i < vd->brightness->count; i++) {
238 if (vd->brightness->levels[i] == cur_level)
239 return i - ACPI_VIDEO_FIRST_LEVEL;
240 }
241 return 0;
242 }
243
244 static int acpi_video_set_brightness(struct backlight_device *bd)
245 {
246 int request_level = bd->props.brightness + ACPI_VIDEO_FIRST_LEVEL;
247 struct acpi_video_device *vd = bl_get_data(bd);
248
249 cancel_delayed_work(&vd->switch_brightness_work);
250 return acpi_video_device_lcd_set_level(vd,
251 vd->brightness->levels[request_level]);
252 }
253
254 static const struct backlight_ops acpi_backlight_ops = {
255 .get_brightness = acpi_video_get_brightness,
256 .update_status = acpi_video_set_brightness,
257 };
258
259 /* thermal cooling device callbacks */
260 static int video_get_max_state(struct thermal_cooling_device *cooling_dev,
261 unsigned long *state)
262 {
263 struct acpi_device *device = cooling_dev->devdata;
264 struct acpi_video_device *video = acpi_driver_data(device);
265
266 *state = video->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1;
267 return 0;
268 }
269
270 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev,
271 unsigned long *state)
272 {
273 struct acpi_device *device = cooling_dev->devdata;
274 struct acpi_video_device *video = acpi_driver_data(device);
275 unsigned long long level;
276 int offset;
277
278 if (acpi_video_device_lcd_get_level_current(video, &level, false))
279 return -EINVAL;
280 for (offset = ACPI_VIDEO_FIRST_LEVEL; offset < video->brightness->count;
281 offset++)
282 if (level == video->brightness->levels[offset]) {
283 *state = video->brightness->count - offset - 1;
284 return 0;
285 }
286
287 return -EINVAL;
288 }
289
290 static int
291 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
292 {
293 struct acpi_device *device = cooling_dev->devdata;
294 struct acpi_video_device *video = acpi_driver_data(device);
295 int level;
296
297 if (state >= video->brightness->count - ACPI_VIDEO_FIRST_LEVEL)
298 return -EINVAL;
299
300 state = video->brightness->count - state;
301 level = video->brightness->levels[state - 1];
302 return acpi_video_device_lcd_set_level(video, level);
303 }
304
305 static const struct thermal_cooling_device_ops video_cooling_ops = {
306 .get_max_state = video_get_max_state,
307 .get_cur_state = video_get_cur_state,
308 .set_cur_state = video_set_cur_state,
309 };
310
311 /*
312 * --------------------------------------------------------------------------
313 * Video Management
314 * --------------------------------------------------------------------------
315 */
316
317 static int
318 acpi_video_device_lcd_query_levels(acpi_handle handle,
319 union acpi_object **levels)
320 {
321 int status;
322 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
323 union acpi_object *obj;
324
325
326 *levels = NULL;
327
328 status = acpi_evaluate_object(handle, "_BCL", NULL, &buffer);
329 if (!ACPI_SUCCESS(status))
330 return status;
331 obj = (union acpi_object *)buffer.pointer;
332 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
333 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
334 status = -EFAULT;
335 goto err;
336 }
337
338 *levels = obj;
339
340 return 0;
341
342 err:
343 kfree(buffer.pointer);
344
345 return status;
346 }
347
348 static int
349 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
350 {
351 int status;
352 int state;
353
354 status = acpi_execute_simple_method(device->dev->handle,
355 "_BCM", level);
356 if (ACPI_FAILURE(status)) {
357 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
358 return -EIO;
359 }
360
361 device->brightness->curr = level;
362 for (state = ACPI_VIDEO_FIRST_LEVEL; state < device->brightness->count;
363 state++)
364 if (level == device->brightness->levels[state]) {
365 if (device->backlight)
366 device->backlight->props.brightness =
367 state - ACPI_VIDEO_FIRST_LEVEL;
368 return 0;
369 }
370
371 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
372 return -EINVAL;
373 }
374
375 /*
376 * For some buggy _BQC methods, we need to add a constant value to
377 * the _BQC return value to get the actual current brightness level
378 */
379
380 static int bqc_offset_aml_bug_workaround;
381 static int video_set_bqc_offset(const struct dmi_system_id *d)
382 {
383 bqc_offset_aml_bug_workaround = 9;
384 return 0;
385 }
386
387 static int video_disable_backlight_sysfs_if(
388 const struct dmi_system_id *d)
389 {
390 if (disable_backlight_sysfs_if == -1)
391 disable_backlight_sysfs_if = 1;
392 return 0;
393 }
394
395 static int video_set_device_id_scheme(const struct dmi_system_id *d)
396 {
397 device_id_scheme = true;
398 return 0;
399 }
400
401 static int video_enable_only_lcd(const struct dmi_system_id *d)
402 {
403 only_lcd = true;
404 return 0;
405 }
406
407 static int video_set_report_key_events(const struct dmi_system_id *id)
408 {
409 if (report_key_events == -1)
410 report_key_events = (uintptr_t)id->driver_data;
411 return 0;
412 }
413
414 static int video_hw_changes_brightness(
415 const struct dmi_system_id *d)
416 {
417 if (hw_changes_brightness == -1)
418 hw_changes_brightness = 1;
419 return 0;
420 }
421
422 static const struct dmi_system_id video_dmi_table[] = {
423 /*
424 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
425 */
426 {
427 .callback = video_set_bqc_offset,
428 .ident = "Acer Aspire 5720",
429 .matches = {
430 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
431 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
432 },
433 },
434 {
435 .callback = video_set_bqc_offset,
436 .ident = "Acer Aspire 5710Z",
437 .matches = {
438 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
439 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
440 },
441 },
442 {
443 .callback = video_set_bqc_offset,
444 .ident = "eMachines E510",
445 .matches = {
446 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
447 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
448 },
449 },
450 {
451 .callback = video_set_bqc_offset,
452 .ident = "Acer Aspire 5315",
453 .matches = {
454 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
455 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
456 },
457 },
458 {
459 .callback = video_set_bqc_offset,
460 .ident = "Acer Aspire 7720",
461 .matches = {
462 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
463 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
464 },
465 },
466
467 /*
468 * Some machines have a broken acpi-video interface for brightness
469 * control, but still need an acpi_video_device_lcd_set_level() call
470 * on resume to turn the backlight power on. We Enable backlight
471 * control on these systems, but do not register a backlight sysfs
472 * as brightness control does not work.
473 */
474 {
475 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
476 .callback = video_disable_backlight_sysfs_if,
477 .ident = "Toshiba Portege R700",
478 .matches = {
479 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
480 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
481 },
482 },
483 {
484 /* https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
485 .callback = video_disable_backlight_sysfs_if,
486 .ident = "Toshiba Portege R830",
487 .matches = {
488 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
489 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R830"),
490 },
491 },
492 {
493 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
494 .callback = video_disable_backlight_sysfs_if,
495 .ident = "Toshiba Satellite R830",
496 .matches = {
497 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
498 DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE R830"),
499 },
500 },
501 /*
502 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set
503 * but the IDs actually follow the Device ID Scheme.
504 */
505 {
506 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
507 .callback = video_set_device_id_scheme,
508 .ident = "ESPRIMO Mobile M9410",
509 .matches = {
510 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
511 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
512 },
513 },
514 /*
515 * Some machines have multiple video output devices, but only the one
516 * that is the type of LCD can do the backlight control so we should not
517 * register backlight interface for other video output devices.
518 */
519 {
520 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
521 .callback = video_enable_only_lcd,
522 .ident = "ESPRIMO Mobile M9410",
523 .matches = {
524 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
525 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
526 },
527 },
528 /*
529 * Some machines report wrong key events on the acpi-bus, suppress
530 * key event reporting on these. Note this is only intended to work
531 * around events which are plain wrong. In some cases we get double
532 * events, in this case acpi-video is considered the canonical source
533 * and the events from the other source should be filtered. E.g.
534 * by calling acpi_video_handles_brightness_key_presses() from the
535 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb
536 */
537 {
538 .callback = video_set_report_key_events,
539 .driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS),
540 .ident = "Dell Vostro V131",
541 .matches = {
542 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
543 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
544 },
545 },
546 /*
547 * Some machines change the brightness themselves when a brightness
548 * hotkey gets pressed, despite us telling them not to. In this case
549 * acpi_video_device_notify() should only call backlight_force_update(
550 * BACKLIGHT_UPDATE_HOTKEY) and not do anything else.
551 */
552 {
553 /* https://bugzilla.kernel.org/show_bug.cgi?id=204077 */
554 .callback = video_hw_changes_brightness,
555 .ident = "Packard Bell EasyNote MZ35",
556 .matches = {
557 DMI_MATCH(DMI_SYS_VENDOR, "Packard Bell"),
558 DMI_MATCH(DMI_PRODUCT_NAME, "EasyNote MZ35"),
559 },
560 },
561 {}
562 };
563
564 static unsigned long long
565 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
566 unsigned long long bqc_value)
567 {
568 unsigned long long level;
569
570 if (device->brightness->flags._BQC_use_index) {
571 /*
572 * _BQC returns an index that doesn't account for the first 2
573 * items with special meaning (see enum acpi_video_level_idx),
574 * so we need to compensate for that by offsetting ourselves
575 */
576 if (device->brightness->flags._BCL_reversed)
577 bqc_value = device->brightness->count -
578 ACPI_VIDEO_FIRST_LEVEL - 1 - bqc_value;
579
580 level = device->brightness->levels[bqc_value +
581 ACPI_VIDEO_FIRST_LEVEL];
582 } else {
583 level = bqc_value;
584 }
585
586 level += bqc_offset_aml_bug_workaround;
587
588 return level;
589 }
590
591 static int
592 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
593 unsigned long long *level, bool raw)
594 {
595 acpi_status status = AE_OK;
596 int i;
597
598 if (device->cap._BQC || device->cap._BCQ) {
599 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
600
601 status = acpi_evaluate_integer(device->dev->handle, buf,
602 NULL, level);
603 if (ACPI_SUCCESS(status)) {
604 if (raw) {
605 /*
606 * Caller has indicated he wants the raw
607 * value returned by _BQC, so don't furtherly
608 * mess with the value.
609 */
610 return 0;
611 }
612
613 *level = acpi_video_bqc_value_to_level(device, *level);
614
615 for (i = ACPI_VIDEO_FIRST_LEVEL;
616 i < device->brightness->count; i++)
617 if (device->brightness->levels[i] == *level) {
618 device->brightness->curr = *level;
619 return 0;
620 }
621 /*
622 * BQC returned an invalid level.
623 * Stop using it.
624 */
625 ACPI_WARNING((AE_INFO,
626 "%s returned an invalid level",
627 buf));
628 device->cap._BQC = device->cap._BCQ = 0;
629 } else {
630 /*
631 * Fixme:
632 * should we return an error or ignore this failure?
633 * dev->brightness->curr is a cached value which stores
634 * the correct current backlight level in most cases.
635 * ACPI video backlight still works w/ buggy _BQC.
636 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
637 */
638 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
639 device->cap._BQC = device->cap._BCQ = 0;
640 }
641 }
642
643 *level = device->brightness->curr;
644 return 0;
645 }
646
647 static int
648 acpi_video_device_EDID(struct acpi_video_device *device,
649 union acpi_object **edid, ssize_t length)
650 {
651 int status;
652 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
653 union acpi_object *obj;
654 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
655 struct acpi_object_list args = { 1, &arg0 };
656
657
658 *edid = NULL;
659
660 if (!device)
661 return -ENODEV;
662 if (length == 128)
663 arg0.integer.value = 1;
664 else if (length == 256)
665 arg0.integer.value = 2;
666 else
667 return -EINVAL;
668
669 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
670 if (ACPI_FAILURE(status))
671 return -ENODEV;
672
673 obj = buffer.pointer;
674
675 if (obj && obj->type == ACPI_TYPE_BUFFER)
676 *edid = obj;
677 else {
678 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
679 status = -EFAULT;
680 kfree(obj);
681 }
682
683 return status;
684 }
685
686 /* bus */
687
688 /*
689 * Arg:
690 * video : video bus device pointer
691 * bios_flag :
692 * 0. The system BIOS should NOT automatically switch(toggle)
693 * the active display output.
694 * 1. The system BIOS should automatically switch (toggle) the
695 * active display output. No switch event.
696 * 2. The _DGS value should be locked.
697 * 3. The system BIOS should not automatically switch (toggle) the
698 * active display output, but instead generate the display switch
699 * event notify code.
700 * lcd_flag :
701 * 0. The system BIOS should automatically control the brightness level
702 * of the LCD when:
703 * - the power changes from AC to DC (ACPI appendix B)
704 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs)
705 * 1. The system BIOS should NOT automatically control the brightness
706 * level of the LCD when:
707 * - the power changes from AC to DC (ACPI appendix B)
708 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs)
709 * Return Value:
710 * -EINVAL wrong arg.
711 */
712
713 static int
714 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
715 {
716 acpi_status status;
717
718 if (!video->cap._DOS)
719 return 0;
720
721 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
722 return -EINVAL;
723 video->dos_setting = (lcd_flag << 2) | bios_flag;
724 status = acpi_execute_simple_method(video->device->handle, "_DOS",
725 (lcd_flag << 2) | bios_flag);
726 if (ACPI_FAILURE(status))
727 return -EIO;
728
729 return 0;
730 }
731
732 /*
733 * Simple comparison function used to sort backlight levels.
734 */
735
736 static int
737 acpi_video_cmp_level(const void *a, const void *b)
738 {
739 return *(int *)a - *(int *)b;
740 }
741
742 /*
743 * Decides if _BQC/_BCQ for this system is usable
744 *
745 * We do this by changing the level first and then read out the current
746 * brightness level, if the value does not match, find out if it is using
747 * index. If not, clear the _BQC/_BCQ capability.
748 */
749 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
750 int max_level, int current_level)
751 {
752 struct acpi_video_device_brightness *br = device->brightness;
753 int result;
754 unsigned long long level;
755 int test_level;
756
757 /* don't mess with existing known broken systems */
758 if (bqc_offset_aml_bug_workaround)
759 return 0;
760
761 /*
762 * Some systems always report current brightness level as maximum
763 * through _BQC, we need to test another value for them. However,
764 * there is a subtlety:
765 *
766 * If the _BCL package ordering is descending, the first level
767 * (br->levels[2]) is likely to be 0, and if the number of levels
768 * matches the number of steps, we might confuse a returned level to
769 * mean the index.
770 *
771 * For example:
772 *
773 * current_level = max_level = 100
774 * test_level = 0
775 * returned level = 100
776 *
777 * In this case 100 means the level, not the index, and _BCM failed.
778 * Still, if the _BCL package ordering is descending, the index of
779 * level 0 is also 100, so we assume _BQC is indexed, when it's not.
780 *
781 * This causes all _BQC calls to return bogus values causing weird
782 * behavior from the user's perspective. For example:
783 *
784 * xbacklight -set 10; xbacklight -set 20;
785 *
786 * would flash to 90% and then slowly down to the desired level (20).
787 *
788 * The solution is simple; test anything other than the first level
789 * (e.g. 1).
790 */
791 test_level = current_level == max_level
792 ? br->levels[ACPI_VIDEO_FIRST_LEVEL + 1]
793 : max_level;
794
795 result = acpi_video_device_lcd_set_level(device, test_level);
796 if (result)
797 return result;
798
799 result = acpi_video_device_lcd_get_level_current(device, &level, true);
800 if (result)
801 return result;
802
803 if (level != test_level) {
804 /* buggy _BQC found, need to find out if it uses index */
805 if (level < br->count) {
806 if (br->flags._BCL_reversed)
807 level = br->count - ACPI_VIDEO_FIRST_LEVEL - 1 - level;
808 if (br->levels[level + ACPI_VIDEO_FIRST_LEVEL] == test_level)
809 br->flags._BQC_use_index = 1;
810 }
811
812 if (!br->flags._BQC_use_index)
813 device->cap._BQC = device->cap._BCQ = 0;
814 }
815
816 return 0;
817 }
818
819 int acpi_video_get_levels(struct acpi_device *device,
820 struct acpi_video_device_brightness **dev_br,
821 int *pmax_level)
822 {
823 union acpi_object *obj = NULL;
824 int i, max_level = 0, count = 0, level_ac_battery = 0;
825 union acpi_object *o;
826 struct acpi_video_device_brightness *br = NULL;
827 int result = 0;
828 u32 value;
829
830 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device->handle,
831 &obj))) {
832 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
833 "LCD brightness level\n"));
834 result = -ENODEV;
835 goto out;
836 }
837
838 if (obj->package.count < ACPI_VIDEO_FIRST_LEVEL) {
839 result = -EINVAL;
840 goto out;
841 }
842
843 br = kzalloc(sizeof(*br), GFP_KERNEL);
844 if (!br) {
845 printk(KERN_ERR "can't allocate memory\n");
846 result = -ENOMEM;
847 goto out;
848 }
849
850 /*
851 * Note that we have to reserve 2 extra items (ACPI_VIDEO_FIRST_LEVEL),
852 * in order to account for buggy BIOS which don't export the first two
853 * special levels (see below)
854 */
855 br->levels = kmalloc_array(obj->package.count + ACPI_VIDEO_FIRST_LEVEL,
856 sizeof(*br->levels),
857 GFP_KERNEL);
858 if (!br->levels) {
859 result = -ENOMEM;
860 goto out_free;
861 }
862
863 for (i = 0; i < obj->package.count; i++) {
864 o = (union acpi_object *)&obj->package.elements[i];
865 if (o->type != ACPI_TYPE_INTEGER) {
866 printk(KERN_ERR PREFIX "Invalid data\n");
867 continue;
868 }
869 value = (u32) o->integer.value;
870 /* Skip duplicate entries */
871 if (count > ACPI_VIDEO_FIRST_LEVEL
872 && br->levels[count - 1] == value)
873 continue;
874
875 br->levels[count] = value;
876
877 if (br->levels[count] > max_level)
878 max_level = br->levels[count];
879 count++;
880 }
881
882 /*
883 * some buggy BIOS don't export the levels
884 * when machine is on AC/Battery in _BCL package.
885 * In this case, the first two elements in _BCL packages
886 * are also supported brightness levels that OS should take care of.
887 */
888 for (i = ACPI_VIDEO_FIRST_LEVEL; i < count; i++) {
889 if (br->levels[i] == br->levels[ACPI_VIDEO_AC_LEVEL])
890 level_ac_battery++;
891 if (br->levels[i] == br->levels[ACPI_VIDEO_BATTERY_LEVEL])
892 level_ac_battery++;
893 }
894
895 if (level_ac_battery < ACPI_VIDEO_FIRST_LEVEL) {
896 level_ac_battery = ACPI_VIDEO_FIRST_LEVEL - level_ac_battery;
897 br->flags._BCL_no_ac_battery_levels = 1;
898 for (i = (count - 1 + level_ac_battery);
899 i >= ACPI_VIDEO_FIRST_LEVEL; i--)
900 br->levels[i] = br->levels[i - level_ac_battery];
901 count += level_ac_battery;
902 } else if (level_ac_battery > ACPI_VIDEO_FIRST_LEVEL)
903 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
904
905 /* Check if the _BCL package is in a reversed order */
906 if (max_level == br->levels[ACPI_VIDEO_FIRST_LEVEL]) {
907 br->flags._BCL_reversed = 1;
908 sort(&br->levels[ACPI_VIDEO_FIRST_LEVEL],
909 count - ACPI_VIDEO_FIRST_LEVEL,
910 sizeof(br->levels[ACPI_VIDEO_FIRST_LEVEL]),
911 acpi_video_cmp_level, NULL);
912 } else if (max_level != br->levels[count - 1])
913 ACPI_ERROR((AE_INFO,
914 "Found unordered _BCL package"));
915
916 br->count = count;
917 *dev_br = br;
918 if (pmax_level)
919 *pmax_level = max_level;
920
921 out:
922 kfree(obj);
923 return result;
924 out_free:
925 kfree(br);
926 goto out;
927 }
928 EXPORT_SYMBOL(acpi_video_get_levels);
929
930 /*
931 * Arg:
932 * device : video output device (LCD, CRT, ..)
933 *
934 * Return Value:
935 * Maximum brightness level
936 *
937 * Allocate and initialize device->brightness.
938 */
939
940 static int
941 acpi_video_init_brightness(struct acpi_video_device *device)
942 {
943 int i, max_level = 0;
944 unsigned long long level, level_old;
945 struct acpi_video_device_brightness *br = NULL;
946 int result;
947
948 result = acpi_video_get_levels(device->dev, &br, &max_level);
949 if (result)
950 return result;
951 device->brightness = br;
952
953 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
954 br->curr = level = max_level;
955
956 if (!device->cap._BQC)
957 goto set_level;
958
959 result = acpi_video_device_lcd_get_level_current(device,
960 &level_old, true);
961 if (result)
962 goto out_free_levels;
963
964 result = acpi_video_bqc_quirk(device, max_level, level_old);
965 if (result)
966 goto out_free_levels;
967 /*
968 * cap._BQC may get cleared due to _BQC is found to be broken
969 * in acpi_video_bqc_quirk, so check again here.
970 */
971 if (!device->cap._BQC)
972 goto set_level;
973
974 level = acpi_video_bqc_value_to_level(device, level_old);
975 /*
976 * On some buggy laptops, _BQC returns an uninitialized
977 * value when invoked for the first time, i.e.
978 * level_old is invalid (no matter whether it's a level
979 * or an index). Set the backlight to max_level in this case.
980 */
981 for (i = ACPI_VIDEO_FIRST_LEVEL; i < br->count; i++)
982 if (level == br->levels[i])
983 break;
984 if (i == br->count || !level)
985 level = max_level;
986
987 set_level:
988 result = acpi_video_device_lcd_set_level(device, level);
989 if (result)
990 goto out_free_levels;
991
992 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
993 "found %d brightness levels\n",
994 br->count - ACPI_VIDEO_FIRST_LEVEL));
995 return 0;
996
997 out_free_levels:
998 kfree(br->levels);
999 kfree(br);
1000 device->brightness = NULL;
1001 return result;
1002 }
1003
1004 /*
1005 * Arg:
1006 * device : video output device (LCD, CRT, ..)
1007 *
1008 * Return Value:
1009 * None
1010 *
1011 * Find out all required AML methods defined under the output
1012 * device.
1013 */
1014
1015 static void acpi_video_device_find_cap(struct acpi_video_device *device)
1016 {
1017 if (acpi_has_method(device->dev->handle, "_ADR"))
1018 device->cap._ADR = 1;
1019 if (acpi_has_method(device->dev->handle, "_BCL"))
1020 device->cap._BCL = 1;
1021 if (acpi_has_method(device->dev->handle, "_BCM"))
1022 device->cap._BCM = 1;
1023 if (acpi_has_method(device->dev->handle, "_BQC")) {
1024 device->cap._BQC = 1;
1025 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
1026 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
1027 device->cap._BCQ = 1;
1028 }
1029
1030 if (acpi_has_method(device->dev->handle, "_DDC"))
1031 device->cap._DDC = 1;
1032 }
1033
1034 /*
1035 * Arg:
1036 * device : video output device (VGA)
1037 *
1038 * Return Value:
1039 * None
1040 *
1041 * Find out all required AML methods defined under the video bus device.
1042 */
1043
1044 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1045 {
1046 if (acpi_has_method(video->device->handle, "_DOS"))
1047 video->cap._DOS = 1;
1048 if (acpi_has_method(video->device->handle, "_DOD"))
1049 video->cap._DOD = 1;
1050 if (acpi_has_method(video->device->handle, "_ROM"))
1051 video->cap._ROM = 1;
1052 if (acpi_has_method(video->device->handle, "_GPD"))
1053 video->cap._GPD = 1;
1054 if (acpi_has_method(video->device->handle, "_SPD"))
1055 video->cap._SPD = 1;
1056 if (acpi_has_method(video->device->handle, "_VPO"))
1057 video->cap._VPO = 1;
1058 }
1059
1060 /*
1061 * Check whether the video bus device has required AML method to
1062 * support the desired features
1063 */
1064
1065 static int acpi_video_bus_check(struct acpi_video_bus *video)
1066 {
1067 acpi_status status = -ENOENT;
1068 struct pci_dev *dev;
1069
1070 if (!video)
1071 return -EINVAL;
1072
1073 dev = acpi_get_pci_dev(video->device->handle);
1074 if (!dev)
1075 return -ENODEV;
1076 pci_dev_put(dev);
1077
1078 /*
1079 * Since there is no HID, CID and so on for VGA driver, we have
1080 * to check well known required nodes.
1081 */
1082
1083 /* Does this device support video switching? */
1084 if (video->cap._DOS || video->cap._DOD) {
1085 if (!video->cap._DOS) {
1086 printk(KERN_WARNING FW_BUG
1087 "ACPI(%s) defines _DOD but not _DOS\n",
1088 acpi_device_bid(video->device));
1089 }
1090 video->flags.multihead = 1;
1091 status = 0;
1092 }
1093
1094 /* Does this device support retrieving a video ROM? */
1095 if (video->cap._ROM) {
1096 video->flags.rom = 1;
1097 status = 0;
1098 }
1099
1100 /* Does this device support configuring which video device to POST? */
1101 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1102 video->flags.post = 1;
1103 status = 0;
1104 }
1105
1106 return status;
1107 }
1108
1109 /*
1110 * --------------------------------------------------------------------------
1111 * Driver Interface
1112 * --------------------------------------------------------------------------
1113 */
1114
1115 /* device interface */
1116 static struct acpi_video_device_attrib *
1117 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1118 {
1119 struct acpi_video_enumerated_device *ids;
1120 int i;
1121
1122 for (i = 0; i < video->attached_count; i++) {
1123 ids = &video->attached_array[i];
1124 if ((ids->value.int_val & 0xffff) == device_id)
1125 return &ids->value.attrib;
1126 }
1127
1128 return NULL;
1129 }
1130
1131 static int
1132 acpi_video_get_device_type(struct acpi_video_bus *video,
1133 unsigned long device_id)
1134 {
1135 struct acpi_video_enumerated_device *ids;
1136 int i;
1137
1138 for (i = 0; i < video->attached_count; i++) {
1139 ids = &video->attached_array[i];
1140 if ((ids->value.int_val & 0xffff) == device_id)
1141 return ids->value.int_val;
1142 }
1143
1144 return 0;
1145 }
1146
1147 static int
1148 acpi_video_bus_get_one_device(struct acpi_device *device,
1149 struct acpi_video_bus *video)
1150 {
1151 unsigned long long device_id;
1152 int status, device_type;
1153 struct acpi_video_device *data;
1154 struct acpi_video_device_attrib *attribute;
1155
1156 status =
1157 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1158 /* Some device omits _ADR, we skip them instead of fail */
1159 if (ACPI_FAILURE(status))
1160 return 0;
1161
1162 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1163 if (!data)
1164 return -ENOMEM;
1165
1166 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1167 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1168 device->driver_data = data;
1169
1170 data->device_id = device_id;
1171 data->video = video;
1172 data->dev = device;
1173 INIT_DELAYED_WORK(&data->switch_brightness_work,
1174 acpi_video_switch_brightness);
1175
1176 attribute = acpi_video_get_device_attr(video, device_id);
1177
1178 if (attribute && (attribute->device_id_scheme || device_id_scheme)) {
1179 switch (attribute->display_type) {
1180 case ACPI_VIDEO_DISPLAY_CRT:
1181 data->flags.crt = 1;
1182 break;
1183 case ACPI_VIDEO_DISPLAY_TV:
1184 data->flags.tvout = 1;
1185 break;
1186 case ACPI_VIDEO_DISPLAY_DVI:
1187 data->flags.dvi = 1;
1188 break;
1189 case ACPI_VIDEO_DISPLAY_LCD:
1190 data->flags.lcd = 1;
1191 break;
1192 default:
1193 data->flags.unknown = 1;
1194 break;
1195 }
1196 if (attribute->bios_can_detect)
1197 data->flags.bios = 1;
1198 } else {
1199 /* Check for legacy IDs */
1200 device_type = acpi_video_get_device_type(video, device_id);
1201 /* Ignore bits 16 and 18-20 */
1202 switch (device_type & 0xffe2ffff) {
1203 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1204 data->flags.crt = 1;
1205 break;
1206 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1207 data->flags.lcd = 1;
1208 break;
1209 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1210 data->flags.tvout = 1;
1211 break;
1212 default:
1213 data->flags.unknown = 1;
1214 }
1215 }
1216
1217 acpi_video_device_bind(video, data);
1218 acpi_video_device_find_cap(data);
1219
1220 mutex_lock(&video->device_list_lock);
1221 list_add_tail(&data->entry, &video->video_device_list);
1222 mutex_unlock(&video->device_list_lock);
1223
1224 return status;
1225 }
1226
1227 /*
1228 * Arg:
1229 * video : video bus device
1230 *
1231 * Return:
1232 * none
1233 *
1234 * Enumerate the video device list of the video bus,
1235 * bind the ids with the corresponding video devices
1236 * under the video bus.
1237 */
1238
1239 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1240 {
1241 struct acpi_video_device *dev;
1242
1243 mutex_lock(&video->device_list_lock);
1244
1245 list_for_each_entry(dev, &video->video_device_list, entry)
1246 acpi_video_device_bind(video, dev);
1247
1248 mutex_unlock(&video->device_list_lock);
1249 }
1250
1251 /*
1252 * Arg:
1253 * video : video bus device
1254 * device : video output device under the video
1255 * bus
1256 *
1257 * Return:
1258 * none
1259 *
1260 * Bind the ids with the corresponding video devices
1261 * under the video bus.
1262 */
1263
1264 static void
1265 acpi_video_device_bind(struct acpi_video_bus *video,
1266 struct acpi_video_device *device)
1267 {
1268 struct acpi_video_enumerated_device *ids;
1269 int i;
1270
1271 for (i = 0; i < video->attached_count; i++) {
1272 ids = &video->attached_array[i];
1273 if (device->device_id == (ids->value.int_val & 0xffff)) {
1274 ids->bind_info = device;
1275 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1276 }
1277 }
1278 }
1279
1280 static bool acpi_video_device_in_dod(struct acpi_video_device *device)
1281 {
1282 struct acpi_video_bus *video = device->video;
1283 int i;
1284
1285 /*
1286 * If we have a broken _DOD or we have more than 8 output devices
1287 * under the graphics controller node that we can't proper deal with
1288 * in the operation region code currently, no need to test.
1289 */
1290 if (!video->attached_count || video->child_count > 8)
1291 return true;
1292
1293 for (i = 0; i < video->attached_count; i++) {
1294 if ((video->attached_array[i].value.int_val & 0xfff) ==
1295 (device->device_id & 0xfff))
1296 return true;
1297 }
1298
1299 return false;
1300 }
1301
1302 /*
1303 * Arg:
1304 * video : video bus device
1305 *
1306 * Return:
1307 * < 0 : error
1308 *
1309 * Call _DOD to enumerate all devices attached to display adapter
1310 *
1311 */
1312
1313 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1314 {
1315 int status;
1316 int count;
1317 int i;
1318 struct acpi_video_enumerated_device *active_list;
1319 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1320 union acpi_object *dod = NULL;
1321 union acpi_object *obj;
1322
1323 if (!video->cap._DOD)
1324 return AE_NOT_EXIST;
1325
1326 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1327 if (!ACPI_SUCCESS(status)) {
1328 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1329 return status;
1330 }
1331
1332 dod = buffer.pointer;
1333 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1334 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1335 status = -EFAULT;
1336 goto out;
1337 }
1338
1339 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1340 dod->package.count));
1341
1342 active_list = kcalloc(1 + dod->package.count,
1343 sizeof(struct acpi_video_enumerated_device),
1344 GFP_KERNEL);
1345 if (!active_list) {
1346 status = -ENOMEM;
1347 goto out;
1348 }
1349
1350 count = 0;
1351 for (i = 0; i < dod->package.count; i++) {
1352 obj = &dod->package.elements[i];
1353
1354 if (obj->type != ACPI_TYPE_INTEGER) {
1355 printk(KERN_ERR PREFIX
1356 "Invalid _DOD data in element %d\n", i);
1357 continue;
1358 }
1359
1360 active_list[count].value.int_val = obj->integer.value;
1361 active_list[count].bind_info = NULL;
1362 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1363 (int)obj->integer.value));
1364 count++;
1365 }
1366
1367 kfree(video->attached_array);
1368
1369 video->attached_array = active_list;
1370 video->attached_count = count;
1371
1372 out:
1373 kfree(buffer.pointer);
1374 return status;
1375 }
1376
1377 static int
1378 acpi_video_get_next_level(struct acpi_video_device *device,
1379 u32 level_current, u32 event)
1380 {
1381 int min, max, min_above, max_below, i, l, delta = 255;
1382 max = max_below = 0;
1383 min = min_above = 255;
1384 /* Find closest level to level_current */
1385 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) {
1386 l = device->brightness->levels[i];
1387 if (abs(l - level_current) < abs(delta)) {
1388 delta = l - level_current;
1389 if (!delta)
1390 break;
1391 }
1392 }
1393 /* Ajust level_current to closest available level */
1394 level_current += delta;
1395 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) {
1396 l = device->brightness->levels[i];
1397 if (l < min)
1398 min = l;
1399 if (l > max)
1400 max = l;
1401 if (l < min_above && l > level_current)
1402 min_above = l;
1403 if (l > max_below && l < level_current)
1404 max_below = l;
1405 }
1406
1407 switch (event) {
1408 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1409 return (level_current < max) ? min_above : min;
1410 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1411 return (level_current < max) ? min_above : max;
1412 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1413 return (level_current > min) ? max_below : min;
1414 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1415 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1416 return 0;
1417 default:
1418 return level_current;
1419 }
1420 }
1421
1422 static void
1423 acpi_video_switch_brightness(struct work_struct *work)
1424 {
1425 struct acpi_video_device *device = container_of(to_delayed_work(work),
1426 struct acpi_video_device, switch_brightness_work);
1427 unsigned long long level_current, level_next;
1428 int event = device->switch_brightness_event;
1429 int result = -EINVAL;
1430
1431 /* no warning message if acpi_backlight=vendor or a quirk is used */
1432 if (!device->backlight)
1433 return;
1434
1435 if (!device->brightness)
1436 goto out;
1437
1438 result = acpi_video_device_lcd_get_level_current(device,
1439 &level_current,
1440 false);
1441 if (result)
1442 goto out;
1443
1444 level_next = acpi_video_get_next_level(device, level_current, event);
1445
1446 result = acpi_video_device_lcd_set_level(device, level_next);
1447
1448 if (!result)
1449 backlight_force_update(device->backlight,
1450 BACKLIGHT_UPDATE_HOTKEY);
1451
1452 out:
1453 if (result)
1454 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1455 }
1456
1457 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1458 void **edid)
1459 {
1460 struct acpi_video_bus *video;
1461 struct acpi_video_device *video_device;
1462 union acpi_object *buffer = NULL;
1463 acpi_status status;
1464 int i, length;
1465
1466 if (!device || !acpi_driver_data(device))
1467 return -EINVAL;
1468
1469 video = acpi_driver_data(device);
1470
1471 for (i = 0; i < video->attached_count; i++) {
1472 video_device = video->attached_array[i].bind_info;
1473 length = 256;
1474
1475 if (!video_device)
1476 continue;
1477
1478 if (!video_device->cap._DDC)
1479 continue;
1480
1481 if (type) {
1482 switch (type) {
1483 case ACPI_VIDEO_DISPLAY_CRT:
1484 if (!video_device->flags.crt)
1485 continue;
1486 break;
1487 case ACPI_VIDEO_DISPLAY_TV:
1488 if (!video_device->flags.tvout)
1489 continue;
1490 break;
1491 case ACPI_VIDEO_DISPLAY_DVI:
1492 if (!video_device->flags.dvi)
1493 continue;
1494 break;
1495 case ACPI_VIDEO_DISPLAY_LCD:
1496 if (!video_device->flags.lcd)
1497 continue;
1498 break;
1499 }
1500 } else if (video_device->device_id != device_id) {
1501 continue;
1502 }
1503
1504 status = acpi_video_device_EDID(video_device, &buffer, length);
1505
1506 if (ACPI_FAILURE(status) || !buffer ||
1507 buffer->type != ACPI_TYPE_BUFFER) {
1508 length = 128;
1509 status = acpi_video_device_EDID(video_device, &buffer,
1510 length);
1511 if (ACPI_FAILURE(status) || !buffer ||
1512 buffer->type != ACPI_TYPE_BUFFER) {
1513 continue;
1514 }
1515 }
1516
1517 *edid = buffer->buffer.pointer;
1518 return length;
1519 }
1520
1521 return -ENODEV;
1522 }
1523 EXPORT_SYMBOL(acpi_video_get_edid);
1524
1525 static int
1526 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1527 struct acpi_device *device)
1528 {
1529 int status = 0;
1530 struct acpi_device *dev;
1531
1532 /*
1533 * There are systems where video module known to work fine regardless
1534 * of broken _DOD and ignoring returned value here doesn't cause
1535 * any issues later.
1536 */
1537 acpi_video_device_enumerate(video);
1538
1539 list_for_each_entry(dev, &device->children, node) {
1540
1541 status = acpi_video_bus_get_one_device(dev, video);
1542 if (status) {
1543 dev_err(&dev->dev, "Can't attach device\n");
1544 break;
1545 }
1546 video->child_count++;
1547 }
1548 return status;
1549 }
1550
1551 /* acpi_video interface */
1552
1553 /*
1554 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1555 * preform any automatic brightness change on receiving a notification.
1556 */
1557 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1558 {
1559 return acpi_video_bus_DOS(video, 0,
1560 acpi_osi_is_win8() ? 1 : 0);
1561 }
1562
1563 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1564 {
1565 return acpi_video_bus_DOS(video, 0,
1566 acpi_osi_is_win8() ? 0 : 1);
1567 }
1568
1569 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1570 {
1571 struct acpi_video_bus *video = acpi_driver_data(device);
1572 struct input_dev *input;
1573 int keycode = 0;
1574
1575 if (!video || !video->input)
1576 return;
1577
1578 input = video->input;
1579
1580 switch (event) {
1581 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1582 * most likely via hotkey. */
1583 keycode = KEY_SWITCHVIDEOMODE;
1584 break;
1585
1586 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1587 * connector. */
1588 acpi_video_device_enumerate(video);
1589 acpi_video_device_rebind(video);
1590 keycode = KEY_SWITCHVIDEOMODE;
1591 break;
1592
1593 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1594 keycode = KEY_SWITCHVIDEOMODE;
1595 break;
1596 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1597 keycode = KEY_VIDEO_NEXT;
1598 break;
1599 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1600 keycode = KEY_VIDEO_PREV;
1601 break;
1602
1603 default:
1604 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1605 "Unsupported event [0x%x]\n", event));
1606 break;
1607 }
1608
1609 if (acpi_notifier_call_chain(device, event, 0))
1610 /* Something vetoed the keypress. */
1611 keycode = 0;
1612
1613 if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) {
1614 input_report_key(input, keycode, 1);
1615 input_sync(input);
1616 input_report_key(input, keycode, 0);
1617 input_sync(input);
1618 }
1619
1620 return;
1621 }
1622
1623 static void brightness_switch_event(struct acpi_video_device *video_device,
1624 u32 event)
1625 {
1626 if (!brightness_switch_enabled)
1627 return;
1628
1629 video_device->switch_brightness_event = event;
1630 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1631 }
1632
1633 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1634 {
1635 struct acpi_video_device *video_device = data;
1636 struct acpi_device *device = NULL;
1637 struct acpi_video_bus *bus;
1638 struct input_dev *input;
1639 int keycode = 0;
1640
1641 if (!video_device)
1642 return;
1643
1644 device = video_device->dev;
1645 bus = video_device->video;
1646 input = bus->input;
1647
1648 if (hw_changes_brightness > 0) {
1649 if (video_device->backlight)
1650 backlight_force_update(video_device->backlight,
1651 BACKLIGHT_UPDATE_HOTKEY);
1652 acpi_notifier_call_chain(device, event, 0);
1653 return;
1654 }
1655
1656 switch (event) {
1657 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1658 brightness_switch_event(video_device, event);
1659 keycode = KEY_BRIGHTNESS_CYCLE;
1660 break;
1661 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1662 brightness_switch_event(video_device, event);
1663 keycode = KEY_BRIGHTNESSUP;
1664 break;
1665 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1666 brightness_switch_event(video_device, event);
1667 keycode = KEY_BRIGHTNESSDOWN;
1668 break;
1669 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1670 brightness_switch_event(video_device, event);
1671 keycode = KEY_BRIGHTNESS_ZERO;
1672 break;
1673 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1674 brightness_switch_event(video_device, event);
1675 keycode = KEY_DISPLAY_OFF;
1676 break;
1677 default:
1678 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1679 "Unsupported event [0x%x]\n", event));
1680 break;
1681 }
1682
1683 acpi_notifier_call_chain(device, event, 0);
1684
1685 if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) {
1686 input_report_key(input, keycode, 1);
1687 input_sync(input);
1688 input_report_key(input, keycode, 0);
1689 input_sync(input);
1690 }
1691
1692 return;
1693 }
1694
1695 static int acpi_video_resume(struct notifier_block *nb,
1696 unsigned long val, void *ign)
1697 {
1698 struct acpi_video_bus *video;
1699 struct acpi_video_device *video_device;
1700 int i;
1701
1702 switch (val) {
1703 case PM_HIBERNATION_PREPARE:
1704 case PM_SUSPEND_PREPARE:
1705 case PM_RESTORE_PREPARE:
1706 return NOTIFY_DONE;
1707 }
1708
1709 video = container_of(nb, struct acpi_video_bus, pm_nb);
1710
1711 dev_info(&video->device->dev, "Restoring backlight state\n");
1712
1713 for (i = 0; i < video->attached_count; i++) {
1714 video_device = video->attached_array[i].bind_info;
1715 if (video_device && video_device->brightness)
1716 acpi_video_device_lcd_set_level(video_device,
1717 video_device->brightness->curr);
1718 }
1719
1720 return NOTIFY_OK;
1721 }
1722
1723 static acpi_status
1724 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1725 void **return_value)
1726 {
1727 struct acpi_device *device = context;
1728 struct acpi_device *sibling;
1729 int result;
1730
1731 if (handle == device->handle)
1732 return AE_CTRL_TERMINATE;
1733
1734 result = acpi_bus_get_device(handle, &sibling);
1735 if (result)
1736 return AE_OK;
1737
1738 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1739 return AE_ALREADY_EXISTS;
1740
1741 return AE_OK;
1742 }
1743
1744 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1745 {
1746 struct backlight_properties props;
1747 struct pci_dev *pdev;
1748 acpi_handle acpi_parent;
1749 struct device *parent = NULL;
1750 int result;
1751 static int count;
1752 char *name;
1753
1754 result = acpi_video_init_brightness(device);
1755 if (result)
1756 return;
1757
1758 if (disable_backlight_sysfs_if > 0)
1759 return;
1760
1761 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1762 if (!name)
1763 return;
1764 count++;
1765
1766 acpi_get_parent(device->dev->handle, &acpi_parent);
1767
1768 pdev = acpi_get_pci_dev(acpi_parent);
1769 if (pdev) {
1770 parent = &pdev->dev;
1771 pci_dev_put(pdev);
1772 }
1773
1774 memset(&props, 0, sizeof(struct backlight_properties));
1775 props.type = BACKLIGHT_FIRMWARE;
1776 props.max_brightness =
1777 device->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1;
1778 device->backlight = backlight_device_register(name,
1779 parent,
1780 device,
1781 &acpi_backlight_ops,
1782 &props);
1783 kfree(name);
1784 if (IS_ERR(device->backlight)) {
1785 device->backlight = NULL;
1786 return;
1787 }
1788
1789 /*
1790 * Save current brightness level in case we have to restore it
1791 * before acpi_video_device_lcd_set_level() is called next time.
1792 */
1793 device->backlight->props.brightness =
1794 acpi_video_get_brightness(device->backlight);
1795
1796 device->cooling_dev = thermal_cooling_device_register("LCD",
1797 device->dev, &video_cooling_ops);
1798 if (IS_ERR(device->cooling_dev)) {
1799 /*
1800 * Set cooling_dev to NULL so we don't crash trying to free it.
1801 * Also, why the hell we are returning early and not attempt to
1802 * register video output if cooling device registration failed?
1803 * -- dtor
1804 */
1805 device->cooling_dev = NULL;
1806 return;
1807 }
1808
1809 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1810 device->cooling_dev->id);
1811 result = sysfs_create_link(&device->dev->dev.kobj,
1812 &device->cooling_dev->device.kobj,
1813 "thermal_cooling");
1814 if (result)
1815 printk(KERN_ERR PREFIX "Create sysfs link\n");
1816 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1817 &device->dev->dev.kobj, "device");
1818 if (result)
1819 printk(KERN_ERR PREFIX "Create sysfs link\n");
1820 }
1821
1822 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)
1823 {
1824 struct acpi_video_device *dev;
1825 union acpi_object *levels;
1826
1827 mutex_lock(&video->device_list_lock);
1828 list_for_each_entry(dev, &video->video_device_list, entry) {
1829 if (!acpi_video_device_lcd_query_levels(dev->dev->handle, &levels))
1830 kfree(levels);
1831 }
1832 mutex_unlock(&video->device_list_lock);
1833 }
1834
1835 static bool acpi_video_should_register_backlight(struct acpi_video_device *dev)
1836 {
1837 /*
1838 * Do not create backlight device for video output
1839 * device that is not in the enumerated list.
1840 */
1841 if (!acpi_video_device_in_dod(dev)) {
1842 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n");
1843 return false;
1844 }
1845
1846 if (only_lcd)
1847 return dev->flags.lcd;
1848 return true;
1849 }
1850
1851 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1852 {
1853 struct acpi_video_device *dev;
1854
1855 if (video->backlight_registered)
1856 return 0;
1857
1858 acpi_video_run_bcl_for_osi(video);
1859
1860 if (acpi_video_get_backlight_type() != acpi_backlight_video)
1861 return 0;
1862
1863 mutex_lock(&video->device_list_lock);
1864 list_for_each_entry(dev, &video->video_device_list, entry) {
1865 if (acpi_video_should_register_backlight(dev))
1866 acpi_video_dev_register_backlight(dev);
1867 }
1868 mutex_unlock(&video->device_list_lock);
1869
1870 video->backlight_registered = true;
1871
1872 video->pm_nb.notifier_call = acpi_video_resume;
1873 video->pm_nb.priority = 0;
1874 return register_pm_notifier(&video->pm_nb);
1875 }
1876
1877 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1878 {
1879 if (device->backlight) {
1880 backlight_device_unregister(device->backlight);
1881 device->backlight = NULL;
1882 }
1883 if (device->brightness) {
1884 kfree(device->brightness->levels);
1885 kfree(device->brightness);
1886 device->brightness = NULL;
1887 }
1888 if (device->cooling_dev) {
1889 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1890 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1891 thermal_cooling_device_unregister(device->cooling_dev);
1892 device->cooling_dev = NULL;
1893 }
1894 }
1895
1896 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1897 {
1898 struct acpi_video_device *dev;
1899 int error;
1900
1901 if (!video->backlight_registered)
1902 return 0;
1903
1904 error = unregister_pm_notifier(&video->pm_nb);
1905
1906 mutex_lock(&video->device_list_lock);
1907 list_for_each_entry(dev, &video->video_device_list, entry)
1908 acpi_video_dev_unregister_backlight(dev);
1909 mutex_unlock(&video->device_list_lock);
1910
1911 video->backlight_registered = false;
1912
1913 return error;
1914 }
1915
1916 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1917 {
1918 acpi_status status;
1919 struct acpi_device *adev = device->dev;
1920
1921 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1922 acpi_video_device_notify, device);
1923 if (ACPI_FAILURE(status))
1924 dev_err(&adev->dev, "Error installing notify handler\n");
1925 else
1926 device->flags.notify = 1;
1927 }
1928
1929 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1930 {
1931 struct input_dev *input;
1932 struct acpi_video_device *dev;
1933 int error;
1934
1935 video->input = input = input_allocate_device();
1936 if (!input) {
1937 error = -ENOMEM;
1938 goto out;
1939 }
1940
1941 error = acpi_video_bus_start_devices(video);
1942 if (error)
1943 goto err_free_input;
1944
1945 snprintf(video->phys, sizeof(video->phys),
1946 "%s/video/input0", acpi_device_hid(video->device));
1947
1948 input->name = acpi_device_name(video->device);
1949 input->phys = video->phys;
1950 input->id.bustype = BUS_HOST;
1951 input->id.product = 0x06;
1952 input->dev.parent = &video->device->dev;
1953 input->evbit[0] = BIT(EV_KEY);
1954 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1955 set_bit(KEY_VIDEO_NEXT, input->keybit);
1956 set_bit(KEY_VIDEO_PREV, input->keybit);
1957 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1958 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1959 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1960 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1961 set_bit(KEY_DISPLAY_OFF, input->keybit);
1962
1963 error = input_register_device(input);
1964 if (error)
1965 goto err_stop_dev;
1966
1967 mutex_lock(&video->device_list_lock);
1968 list_for_each_entry(dev, &video->video_device_list, entry)
1969 acpi_video_dev_add_notify_handler(dev);
1970 mutex_unlock(&video->device_list_lock);
1971
1972 return 0;
1973
1974 err_stop_dev:
1975 acpi_video_bus_stop_devices(video);
1976 err_free_input:
1977 input_free_device(input);
1978 video->input = NULL;
1979 out:
1980 return error;
1981 }
1982
1983 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1984 {
1985 if (dev->flags.notify) {
1986 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1987 acpi_video_device_notify);
1988 dev->flags.notify = 0;
1989 }
1990 }
1991
1992 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1993 {
1994 struct acpi_video_device *dev;
1995
1996 mutex_lock(&video->device_list_lock);
1997 list_for_each_entry(dev, &video->video_device_list, entry)
1998 acpi_video_dev_remove_notify_handler(dev);
1999 mutex_unlock(&video->device_list_lock);
2000
2001 acpi_video_bus_stop_devices(video);
2002 input_unregister_device(video->input);
2003 video->input = NULL;
2004 }
2005
2006 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2007 {
2008 struct acpi_video_device *dev, *next;
2009
2010 mutex_lock(&video->device_list_lock);
2011 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2012 list_del(&dev->entry);
2013 kfree(dev);
2014 }
2015 mutex_unlock(&video->device_list_lock);
2016
2017 return 0;
2018 }
2019
2020 static int instance;
2021
2022 static int acpi_video_bus_add(struct acpi_device *device)
2023 {
2024 struct acpi_video_bus *video;
2025 int error;
2026 acpi_status status;
2027
2028 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
2029 device->parent->handle, 1,
2030 acpi_video_bus_match, NULL,
2031 device, NULL);
2032 if (status == AE_ALREADY_EXISTS) {
2033 printk(KERN_WARNING FW_BUG
2034 "Duplicate ACPI video bus devices for the"
2035 " same VGA controller, please try module "
2036 "parameter \"video.allow_duplicates=1\""
2037 "if the current driver doesn't work.\n");
2038 if (!allow_duplicates)
2039 return -ENODEV;
2040 }
2041
2042 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2043 if (!video)
2044 return -ENOMEM;
2045
2046 /* a hack to fix the duplicate name "VID" problem on T61 */
2047 if (!strcmp(device->pnp.bus_id, "VID")) {
2048 if (instance)
2049 device->pnp.bus_id[3] = '0' + instance;
2050 instance++;
2051 }
2052 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2053 if (!strcmp(device->pnp.bus_id, "VGA")) {
2054 if (instance)
2055 device->pnp.bus_id[3] = '0' + instance;
2056 instance++;
2057 }
2058
2059 video->device = device;
2060 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2061 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2062 device->driver_data = video;
2063
2064 acpi_video_bus_find_cap(video);
2065 error = acpi_video_bus_check(video);
2066 if (error)
2067 goto err_free_video;
2068
2069 mutex_init(&video->device_list_lock);
2070 INIT_LIST_HEAD(&video->video_device_list);
2071
2072 error = acpi_video_bus_get_devices(video, device);
2073 if (error)
2074 goto err_put_video;
2075
2076 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
2077 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2078 video->flags.multihead ? "yes" : "no",
2079 video->flags.rom ? "yes" : "no",
2080 video->flags.post ? "yes" : "no");
2081 mutex_lock(&video_list_lock);
2082 list_add_tail(&video->entry, &video_bus_head);
2083 mutex_unlock(&video_list_lock);
2084
2085 acpi_video_bus_register_backlight(video);
2086 acpi_video_bus_add_notify_handler(video);
2087
2088 return 0;
2089
2090 err_put_video:
2091 acpi_video_bus_put_devices(video);
2092 kfree(video->attached_array);
2093 err_free_video:
2094 kfree(video);
2095 device->driver_data = NULL;
2096
2097 return error;
2098 }
2099
2100 static int acpi_video_bus_remove(struct acpi_device *device)
2101 {
2102 struct acpi_video_bus *video = NULL;
2103
2104
2105 if (!device || !acpi_driver_data(device))
2106 return -EINVAL;
2107
2108 video = acpi_driver_data(device);
2109
2110 acpi_video_bus_remove_notify_handler(video);
2111 acpi_video_bus_unregister_backlight(video);
2112 acpi_video_bus_put_devices(video);
2113
2114 mutex_lock(&video_list_lock);
2115 list_del(&video->entry);
2116 mutex_unlock(&video_list_lock);
2117
2118 kfree(video->attached_array);
2119 kfree(video);
2120
2121 return 0;
2122 }
2123
2124 static int __init is_i740(struct pci_dev *dev)
2125 {
2126 if (dev->device == 0x00D1)
2127 return 1;
2128 if (dev->device == 0x7000)
2129 return 1;
2130 return 0;
2131 }
2132
2133 static int __init intel_opregion_present(void)
2134 {
2135 int opregion = 0;
2136 struct pci_dev *dev = NULL;
2137 u32 address;
2138
2139 for_each_pci_dev(dev) {
2140 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2141 continue;
2142 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2143 continue;
2144 /* We don't want to poke around undefined i740 registers */
2145 if (is_i740(dev))
2146 continue;
2147 pci_read_config_dword(dev, 0xfc, &address);
2148 if (!address)
2149 continue;
2150 opregion = 1;
2151 }
2152 return opregion;
2153 }
2154
2155 /* Check if the chassis-type indicates there is no builtin LCD panel */
2156 static bool dmi_is_desktop(void)
2157 {
2158 const char *chassis_type;
2159 unsigned long type;
2160
2161 chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE);
2162 if (!chassis_type)
2163 return false;
2164
2165 if (kstrtoul(chassis_type, 10, &type) != 0)
2166 return false;
2167
2168 switch (type) {
2169 case 0x03: /* Desktop */
2170 case 0x04: /* Low Profile Desktop */
2171 case 0x05: /* Pizza Box */
2172 case 0x06: /* Mini Tower */
2173 case 0x07: /* Tower */
2174 case 0x10: /* Lunch Box */
2175 case 0x11: /* Main Server Chassis */
2176 return true;
2177 }
2178
2179 return false;
2180 }
2181
2182 int acpi_video_register(void)
2183 {
2184 int ret = 0;
2185
2186 mutex_lock(&register_count_mutex);
2187 if (register_count) {
2188 /*
2189 * if the function of acpi_video_register is already called,
2190 * don't register the acpi_video_bus again and return no error.
2191 */
2192 goto leave;
2193 }
2194
2195 /*
2196 * We're seeing a lot of bogus backlight interfaces on newer machines
2197 * without a LCD such as desktops, servers and HDMI sticks. Checking
2198 * the lcd flag fixes this, so enable this on any machines which are
2199 * win8 ready (where we also prefer the native backlight driver, so
2200 * normally the acpi_video code should not register there anyways).
2201 */
2202 if (only_lcd == -1) {
2203 if (dmi_is_desktop() && acpi_osi_is_win8())
2204 only_lcd = true;
2205 else
2206 only_lcd = false;
2207 }
2208
2209 dmi_check_system(video_dmi_table);
2210
2211 ret = acpi_bus_register_driver(&acpi_video_bus);
2212 if (ret)
2213 goto leave;
2214
2215 /*
2216 * When the acpi_video_bus is loaded successfully, increase
2217 * the counter reference.
2218 */
2219 register_count = 1;
2220
2221 leave:
2222 mutex_unlock(&register_count_mutex);
2223 return ret;
2224 }
2225 EXPORT_SYMBOL(acpi_video_register);
2226
2227 void acpi_video_unregister(void)
2228 {
2229 mutex_lock(&register_count_mutex);
2230 if (register_count) {
2231 acpi_bus_unregister_driver(&acpi_video_bus);
2232 register_count = 0;
2233 }
2234 mutex_unlock(&register_count_mutex);
2235 }
2236 EXPORT_SYMBOL(acpi_video_unregister);
2237
2238 void acpi_video_unregister_backlight(void)
2239 {
2240 struct acpi_video_bus *video;
2241
2242 mutex_lock(&register_count_mutex);
2243 if (register_count) {
2244 mutex_lock(&video_list_lock);
2245 list_for_each_entry(video, &video_bus_head, entry)
2246 acpi_video_bus_unregister_backlight(video);
2247 mutex_unlock(&video_list_lock);
2248 }
2249 mutex_unlock(&register_count_mutex);
2250 }
2251
2252 bool acpi_video_handles_brightness_key_presses(void)
2253 {
2254 bool have_video_busses;
2255
2256 mutex_lock(&video_list_lock);
2257 have_video_busses = !list_empty(&video_bus_head);
2258 mutex_unlock(&video_list_lock);
2259
2260 return have_video_busses &&
2261 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS);
2262 }
2263 EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses);
2264
2265 /*
2266 * This is kind of nasty. Hardware using Intel chipsets may require
2267 * the video opregion code to be run first in order to initialise
2268 * state before any ACPI video calls are made. To handle this we defer
2269 * registration of the video class until the opregion code has run.
2270 */
2271
2272 static int __init acpi_video_init(void)
2273 {
2274 /*
2275 * Let the module load even if ACPI is disabled (e.g. due to
2276 * a broken BIOS) so that i915.ko can still be loaded on such
2277 * old systems without an AcpiOpRegion.
2278 *
2279 * acpi_video_register() will report -ENODEV later as well due
2280 * to acpi_disabled when i915.ko tries to register itself afterwards.
2281 */
2282 if (acpi_disabled)
2283 return 0;
2284
2285 if (intel_opregion_present())
2286 return 0;
2287
2288 return acpi_video_register();
2289 }
2290
2291 static void __exit acpi_video_exit(void)
2292 {
2293 acpi_video_detect_exit();
2294 acpi_video_unregister();
2295
2296 return;
2297 }
2298
2299 module_init(acpi_video_init);
2300 module_exit(acpi_video_exit);
Linux with added FPC-III support