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 #define pr_fmt(fmt) "ACPI: video: " fmt
11
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/types.h>
16 #include <linux/list.h>
17 #include <linux/mutex.h>
18 #include <linux/input.h>
19 #include <linux/backlight.h>
20 #include <linux/thermal.h>
21 #include <linux/sort.h>
22 #include <linux/pci.h>
23 #include <linux/pci_ids.h>
24 #include <linux/slab.h>
25 #include <linux/dmi.h>
26 #include <linux/suspend.h>
27 #include <linux/acpi.h>
28 #include <acpi/video.h>
29 #include <linux/uaccess.h>
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 MODULE_AUTHOR("Bruno Ducrot");
37 MODULE_DESCRIPTION("ACPI Video Driver");
38 MODULE_LICENSE("GPL");
39
40 static bool brightness_switch_enabled = true;
41 module_param(brightness_switch_enabled, bool, 0644);
42
43 /*
44 * By default, we don't allow duplicate ACPI video bus devices
45 * under the same VGA controller
46 */
47 static bool allow_duplicates;
48 module_param(allow_duplicates, bool, 0644);
49
50 static int disable_backlight_sysfs_if = -1;
51 module_param(disable_backlight_sysfs_if, int, 0444);
52
53 #define REPORT_OUTPUT_KEY_EVENTS 0x01
54 #define REPORT_BRIGHTNESS_KEY_EVENTS 0x02
55 static int report_key_events = -1;
56 module_param(report_key_events, int, 0644);
57 MODULE_PARM_DESC(report_key_events,
58 "0: none, 1: output changes, 2: brightness changes, 3: all");
59
60 static int hw_changes_brightness = -1;
61 module_param(hw_changes_brightness, int, 0644);
62 MODULE_PARM_DESC(hw_changes_brightness,
63 "Set this to 1 on buggy hw which changes the brightness itself when "
64 "a hotkey is pressed: -1: auto, 0: normal 1: hw-changes-brightness");
65
66 /*
67 * Whether the struct acpi_video_device_attrib::device_id_scheme bit should be
68 * assumed even if not actually set.
69 */
70 static bool device_id_scheme = false;
71 module_param(device_id_scheme, bool, 0444);
72
73 static int only_lcd = -1;
74 module_param(only_lcd, int, 0444);
75
76 static int register_count;
77 static DEFINE_MUTEX(register_count_mutex);
78 static DEFINE_MUTEX(video_list_lock);
79 static LIST_HEAD(video_bus_head);
80 static int acpi_video_bus_add(struct acpi_device *device);
81 static int acpi_video_bus_remove(struct acpi_device *device);
82 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
83 void acpi_video_detect_exit(void);
84
85 /*
86 * Indices in the _BCL method response: the first two items are special,
87 * the rest are all supported levels.
88 *
89 * See page 575 of the ACPI spec 3.0
90 */
91 enum acpi_video_level_idx {
92 ACPI_VIDEO_AC_LEVEL, /* level when machine has full power */
93 ACPI_VIDEO_BATTERY_LEVEL, /* level when machine is on batteries */
94 ACPI_VIDEO_FIRST_LEVEL, /* actual supported levels begin here */
95 };
96
97 static const struct acpi_device_id video_device_ids[] = {
98 {ACPI_VIDEO_HID, 0},
99 {"", 0},
100 };
101 MODULE_DEVICE_TABLE(acpi, video_device_ids);
102
103 static struct acpi_driver acpi_video_bus = {
104 .name = "video",
105 .class = ACPI_VIDEO_CLASS,
106 .ids = video_device_ids,
107 .ops = {
108 .add = acpi_video_bus_add,
109 .remove = acpi_video_bus_remove,
110 .notify = acpi_video_bus_notify,
111 },
112 };
113
114 struct acpi_video_bus_flags {
115 u8 multihead:1; /* can switch video heads */
116 u8 rom:1; /* can retrieve a video rom */
117 u8 post:1; /* can configure the head to */
118 u8 reserved:5;
119 };
120
121 struct acpi_video_bus_cap {
122 u8 _DOS:1; /* Enable/Disable output switching */
123 u8 _DOD:1; /* Enumerate all devices attached to display adapter */
124 u8 _ROM:1; /* Get ROM Data */
125 u8 _GPD:1; /* Get POST Device */
126 u8 _SPD:1; /* Set POST Device */
127 u8 _VPO:1; /* Video POST Options */
128 u8 reserved:2;
129 };
130
131 struct acpi_video_device_attrib {
132 u32 display_index:4; /* A zero-based instance of the Display */
133 u32 display_port_attachment:4; /* This field differentiates the display type */
134 u32 display_type:4; /* Describe the specific type in use */
135 u32 vendor_specific:4; /* Chipset Vendor Specific */
136 u32 bios_can_detect:1; /* BIOS can detect the device */
137 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
138 the VGA device. */
139 u32 pipe_id:3; /* For VGA multiple-head devices. */
140 u32 reserved:10; /* Must be 0 */
141
142 /*
143 * The device ID might not actually follow the scheme described by this
144 * struct acpi_video_device_attrib. If it does, then this bit
145 * device_id_scheme is set; otherwise, other fields should be ignored.
146 *
147 * (but also see the global flag device_id_scheme)
148 */
149 u32 device_id_scheme:1;
150 };
151
152 struct acpi_video_enumerated_device {
153 union {
154 u32 int_val;
155 struct acpi_video_device_attrib attrib;
156 } value;
157 struct acpi_video_device *bind_info;
158 };
159
160 struct acpi_video_bus {
161 struct acpi_device *device;
162 bool backlight_registered;
163 u8 dos_setting;
164 struct acpi_video_enumerated_device *attached_array;
165 u8 attached_count;
166 u8 child_count;
167 struct acpi_video_bus_cap cap;
168 struct acpi_video_bus_flags flags;
169 struct list_head video_device_list;
170 struct mutex device_list_lock; /* protects video_device_list */
171 struct list_head entry;
172 struct input_dev *input;
173 char phys[32]; /* for input device */
174 struct notifier_block pm_nb;
175 };
176
177 struct acpi_video_device_flags {
178 u8 crt:1;
179 u8 lcd:1;
180 u8 tvout:1;
181 u8 dvi:1;
182 u8 bios:1;
183 u8 unknown:1;
184 u8 notify:1;
185 u8 reserved:1;
186 };
187
188 struct acpi_video_device_cap {
189 u8 _ADR:1; /* Return the unique ID */
190 u8 _BCL:1; /* Query list of brightness control levels supported */
191 u8 _BCM:1; /* Set the brightness level */
192 u8 _BQC:1; /* Get current brightness level */
193 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
194 u8 _DDC:1; /* Return the EDID for this device */
195 };
196
197 struct acpi_video_device {
198 unsigned long device_id;
199 struct acpi_video_device_flags flags;
200 struct acpi_video_device_cap cap;
201 struct list_head entry;
202 struct delayed_work switch_brightness_work;
203 int switch_brightness_event;
204 struct acpi_video_bus *video;
205 struct acpi_device *dev;
206 struct acpi_video_device_brightness *brightness;
207 struct backlight_device *backlight;
208 struct thermal_cooling_device *cooling_dev;
209 };
210
211 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
212 static void acpi_video_device_rebind(struct acpi_video_bus *video);
213 static void acpi_video_device_bind(struct acpi_video_bus *video,
214 struct acpi_video_device *device);
215 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
216 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
217 int level);
218 static int acpi_video_device_lcd_get_level_current(
219 struct acpi_video_device *device,
220 unsigned long long *level, bool raw);
221 static int acpi_video_get_next_level(struct acpi_video_device *device,
222 u32 level_current, u32 event);
223 static void acpi_video_switch_brightness(struct work_struct *work);
224
225 /* backlight device sysfs support */
acpi_video_get_brightness(struct backlight_device * bd)226 static int acpi_video_get_brightness(struct backlight_device *bd)
227 {
228 unsigned long long cur_level;
229 int i;
230 struct acpi_video_device *vd = bl_get_data(bd);
231
232 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
233 return -EINVAL;
234 for (i = ACPI_VIDEO_FIRST_LEVEL; i < vd->brightness->count; i++) {
235 if (vd->brightness->levels[i] == cur_level)
236 return i - ACPI_VIDEO_FIRST_LEVEL;
237 }
238 return 0;
239 }
240
acpi_video_set_brightness(struct backlight_device * bd)241 static int acpi_video_set_brightness(struct backlight_device *bd)
242 {
243 int request_level = bd->props.brightness + ACPI_VIDEO_FIRST_LEVEL;
244 struct acpi_video_device *vd = bl_get_data(bd);
245
246 cancel_delayed_work(&vd->switch_brightness_work);
247 return acpi_video_device_lcd_set_level(vd,
248 vd->brightness->levels[request_level]);
249 }
250
251 static const struct backlight_ops acpi_backlight_ops = {
252 .get_brightness = acpi_video_get_brightness,
253 .update_status = acpi_video_set_brightness,
254 };
255
256 /* thermal cooling device callbacks */
video_get_max_state(struct thermal_cooling_device * cooling_dev,unsigned long * state)257 static int video_get_max_state(struct thermal_cooling_device *cooling_dev,
258 unsigned long *state)
259 {
260 struct acpi_device *device = cooling_dev->devdata;
261 struct acpi_video_device *video = acpi_driver_data(device);
262
263 *state = video->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1;
264 return 0;
265 }
266
video_get_cur_state(struct thermal_cooling_device * cooling_dev,unsigned long * state)267 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev,
268 unsigned long *state)
269 {
270 struct acpi_device *device = cooling_dev->devdata;
271 struct acpi_video_device *video = acpi_driver_data(device);
272 unsigned long long level;
273 int offset;
274
275 if (acpi_video_device_lcd_get_level_current(video, &level, false))
276 return -EINVAL;
277 for (offset = ACPI_VIDEO_FIRST_LEVEL; offset < video->brightness->count;
278 offset++)
279 if (level == video->brightness->levels[offset]) {
280 *state = video->brightness->count - offset - 1;
281 return 0;
282 }
283
284 return -EINVAL;
285 }
286
287 static int
video_set_cur_state(struct thermal_cooling_device * cooling_dev,unsigned long state)288 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
289 {
290 struct acpi_device *device = cooling_dev->devdata;
291 struct acpi_video_device *video = acpi_driver_data(device);
292 int level;
293
294 if (state >= video->brightness->count - ACPI_VIDEO_FIRST_LEVEL)
295 return -EINVAL;
296
297 state = video->brightness->count - state;
298 level = video->brightness->levels[state - 1];
299 return acpi_video_device_lcd_set_level(video, level);
300 }
301
302 static const struct thermal_cooling_device_ops video_cooling_ops = {
303 .get_max_state = video_get_max_state,
304 .get_cur_state = video_get_cur_state,
305 .set_cur_state = video_set_cur_state,
306 };
307
308 /*
309 * --------------------------------------------------------------------------
310 * Video Management
311 * --------------------------------------------------------------------------
312 */
313
314 static int
acpi_video_device_lcd_query_levels(acpi_handle handle,union acpi_object ** levels)315 acpi_video_device_lcd_query_levels(acpi_handle handle,
316 union acpi_object **levels)
317 {
318 int status;
319 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
320 union acpi_object *obj;
321
322
323 *levels = NULL;
324
325 status = acpi_evaluate_object(handle, "_BCL", NULL, &buffer);
326 if (ACPI_FAILURE(status))
327 return status;
328 obj = (union acpi_object *)buffer.pointer;
329 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
330 acpi_handle_info(handle, "Invalid _BCL data\n");
331 status = -EFAULT;
332 goto err;
333 }
334
335 *levels = obj;
336
337 return 0;
338
339 err:
340 kfree(buffer.pointer);
341
342 return status;
343 }
344
345 static int
acpi_video_device_lcd_set_level(struct acpi_video_device * device,int level)346 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
347 {
348 int status;
349 int state;
350
351 status = acpi_execute_simple_method(device->dev->handle,
352 "_BCM", level);
353 if (ACPI_FAILURE(status)) {
354 acpi_handle_info(device->dev->handle, "_BCM evaluation failed\n");
355 return -EIO;
356 }
357
358 device->brightness->curr = level;
359 for (state = ACPI_VIDEO_FIRST_LEVEL; state < device->brightness->count;
360 state++)
361 if (level == device->brightness->levels[state]) {
362 if (device->backlight)
363 device->backlight->props.brightness =
364 state - ACPI_VIDEO_FIRST_LEVEL;
365 return 0;
366 }
367
368 acpi_handle_info(device->dev->handle, "Current brightness invalid\n");
369 return -EINVAL;
370 }
371
372 /*
373 * For some buggy _BQC methods, we need to add a constant value to
374 * the _BQC return value to get the actual current brightness level
375 */
376
377 static int bqc_offset_aml_bug_workaround;
video_set_bqc_offset(const struct dmi_system_id * d)378 static int video_set_bqc_offset(const struct dmi_system_id *d)
379 {
380 bqc_offset_aml_bug_workaround = 9;
381 return 0;
382 }
383
video_disable_backlight_sysfs_if(const struct dmi_system_id * d)384 static int video_disable_backlight_sysfs_if(
385 const struct dmi_system_id *d)
386 {
387 if (disable_backlight_sysfs_if == -1)
388 disable_backlight_sysfs_if = 1;
389 return 0;
390 }
391
video_set_device_id_scheme(const struct dmi_system_id * d)392 static int video_set_device_id_scheme(const struct dmi_system_id *d)
393 {
394 device_id_scheme = true;
395 return 0;
396 }
397
video_enable_only_lcd(const struct dmi_system_id * d)398 static int video_enable_only_lcd(const struct dmi_system_id *d)
399 {
400 only_lcd = true;
401 return 0;
402 }
403
video_set_report_key_events(const struct dmi_system_id * id)404 static int video_set_report_key_events(const struct dmi_system_id *id)
405 {
406 if (report_key_events == -1)
407 report_key_events = (uintptr_t)id->driver_data;
408 return 0;
409 }
410
video_hw_changes_brightness(const struct dmi_system_id * d)411 static int video_hw_changes_brightness(
412 const struct dmi_system_id *d)
413 {
414 if (hw_changes_brightness == -1)
415 hw_changes_brightness = 1;
416 return 0;
417 }
418
419 static const struct dmi_system_id video_dmi_table[] = {
420 /*
421 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
422 */
423 {
424 .callback = video_set_bqc_offset,
425 .ident = "Acer Aspire 5720",
426 .matches = {
427 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
428 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
429 },
430 },
431 {
432 .callback = video_set_bqc_offset,
433 .ident = "Acer Aspire 5710Z",
434 .matches = {
435 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
436 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
437 },
438 },
439 {
440 .callback = video_set_bqc_offset,
441 .ident = "eMachines E510",
442 .matches = {
443 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
444 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
445 },
446 },
447 {
448 .callback = video_set_bqc_offset,
449 .ident = "Acer Aspire 5315",
450 .matches = {
451 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
452 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
453 },
454 },
455 {
456 .callback = video_set_bqc_offset,
457 .ident = "Acer Aspire 7720",
458 .matches = {
459 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
460 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
461 },
462 },
463
464 /*
465 * Some machines have a broken acpi-video interface for brightness
466 * control, but still need an acpi_video_device_lcd_set_level() call
467 * on resume to turn the backlight power on. We Enable backlight
468 * control on these systems, but do not register a backlight sysfs
469 * as brightness control does not work.
470 */
471 {
472 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
473 .callback = video_disable_backlight_sysfs_if,
474 .ident = "Toshiba Portege R700",
475 .matches = {
476 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
477 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
478 },
479 },
480 {
481 /* https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
482 .callback = video_disable_backlight_sysfs_if,
483 .ident = "Toshiba Portege R830",
484 .matches = {
485 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
486 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R830"),
487 },
488 },
489 {
490 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
491 .callback = video_disable_backlight_sysfs_if,
492 .ident = "Toshiba Satellite R830",
493 .matches = {
494 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
495 DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE R830"),
496 },
497 },
498 /*
499 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set
500 * but the IDs actually follow the Device ID Scheme.
501 */
502 {
503 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
504 .callback = video_set_device_id_scheme,
505 .ident = "ESPRIMO Mobile M9410",
506 .matches = {
507 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
508 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
509 },
510 },
511 /*
512 * Some machines have multiple video output devices, but only the one
513 * that is the type of LCD can do the backlight control so we should not
514 * register backlight interface for other video output devices.
515 */
516 {
517 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
518 .callback = video_enable_only_lcd,
519 .ident = "ESPRIMO Mobile M9410",
520 .matches = {
521 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
522 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
523 },
524 },
525 /*
526 * Some machines report wrong key events on the acpi-bus, suppress
527 * key event reporting on these. Note this is only intended to work
528 * around events which are plain wrong. In some cases we get double
529 * events, in this case acpi-video is considered the canonical source
530 * and the events from the other source should be filtered. E.g.
531 * by calling acpi_video_handles_brightness_key_presses() from the
532 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb
533 */
534 {
535 .callback = video_set_report_key_events,
536 .driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS),
537 .ident = "Dell Vostro V131",
538 .matches = {
539 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
540 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
541 },
542 },
543 /*
544 * Some machines change the brightness themselves when a brightness
545 * hotkey gets pressed, despite us telling them not to. In this case
546 * acpi_video_device_notify() should only call backlight_force_update(
547 * BACKLIGHT_UPDATE_HOTKEY) and not do anything else.
548 */
549 {
550 /* https://bugzilla.kernel.org/show_bug.cgi?id=204077 */
551 .callback = video_hw_changes_brightness,
552 .ident = "Packard Bell EasyNote MZ35",
553 .matches = {
554 DMI_MATCH(DMI_SYS_VENDOR, "Packard Bell"),
555 DMI_MATCH(DMI_PRODUCT_NAME, "EasyNote MZ35"),
556 },
557 },
558 {}
559 };
560
561 static unsigned long long
acpi_video_bqc_value_to_level(struct acpi_video_device * device,unsigned long long bqc_value)562 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
563 unsigned long long bqc_value)
564 {
565 unsigned long long level;
566
567 if (device->brightness->flags._BQC_use_index) {
568 /*
569 * _BQC returns an index that doesn't account for the first 2
570 * items with special meaning (see enum acpi_video_level_idx),
571 * so we need to compensate for that by offsetting ourselves
572 */
573 if (device->brightness->flags._BCL_reversed)
574 bqc_value = device->brightness->count -
575 ACPI_VIDEO_FIRST_LEVEL - 1 - bqc_value;
576
577 level = device->brightness->levels[bqc_value +
578 ACPI_VIDEO_FIRST_LEVEL];
579 } else {
580 level = bqc_value;
581 }
582
583 level += bqc_offset_aml_bug_workaround;
584
585 return level;
586 }
587
588 static int
acpi_video_device_lcd_get_level_current(struct acpi_video_device * device,unsigned long long * level,bool raw)589 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
590 unsigned long long *level, bool raw)
591 {
592 acpi_status status = AE_OK;
593 int i;
594
595 if (device->cap._BQC || device->cap._BCQ) {
596 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
597
598 status = acpi_evaluate_integer(device->dev->handle, buf,
599 NULL, level);
600 if (ACPI_SUCCESS(status)) {
601 if (raw) {
602 /*
603 * Caller has indicated he wants the raw
604 * value returned by _BQC, so don't furtherly
605 * mess with the value.
606 */
607 return 0;
608 }
609
610 *level = acpi_video_bqc_value_to_level(device, *level);
611
612 for (i = ACPI_VIDEO_FIRST_LEVEL;
613 i < device->brightness->count; i++)
614 if (device->brightness->levels[i] == *level) {
615 device->brightness->curr = *level;
616 return 0;
617 }
618 /*
619 * BQC returned an invalid level.
620 * Stop using it.
621 */
622 acpi_handle_info(device->dev->handle,
623 "%s returned an invalid level", buf);
624 device->cap._BQC = device->cap._BCQ = 0;
625 } else {
626 /*
627 * Fixme:
628 * should we return an error or ignore this failure?
629 * dev->brightness->curr is a cached value which stores
630 * the correct current backlight level in most cases.
631 * ACPI video backlight still works w/ buggy _BQC.
632 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
633 */
634 acpi_handle_info(device->dev->handle,
635 "%s evaluation failed", buf);
636 device->cap._BQC = device->cap._BCQ = 0;
637 }
638 }
639
640 *level = device->brightness->curr;
641 return 0;
642 }
643
644 static int
acpi_video_device_EDID(struct acpi_video_device * device,union acpi_object ** edid,ssize_t length)645 acpi_video_device_EDID(struct acpi_video_device *device,
646 union acpi_object **edid, ssize_t length)
647 {
648 int status;
649 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
650 union acpi_object *obj;
651 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
652 struct acpi_object_list args = { 1, &arg0 };
653
654
655 *edid = NULL;
656
657 if (!device)
658 return -ENODEV;
659 if (length == 128)
660 arg0.integer.value = 1;
661 else if (length == 256)
662 arg0.integer.value = 2;
663 else
664 return -EINVAL;
665
666 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
667 if (ACPI_FAILURE(status))
668 return -ENODEV;
669
670 obj = buffer.pointer;
671
672 if (obj && obj->type == ACPI_TYPE_BUFFER)
673 *edid = obj;
674 else {
675 acpi_handle_info(device->dev->handle, "Invalid _DDC data\n");
676 status = -EFAULT;
677 kfree(obj);
678 }
679
680 return status;
681 }
682
683 /* bus */
684
685 /*
686 * Arg:
687 * video : video bus device pointer
688 * bios_flag :
689 * 0. The system BIOS should NOT automatically switch(toggle)
690 * the active display output.
691 * 1. The system BIOS should automatically switch (toggle) the
692 * active display output. No switch event.
693 * 2. The _DGS value should be locked.
694 * 3. The system BIOS should not automatically switch (toggle) the
695 * active display output, but instead generate the display switch
696 * event notify code.
697 * lcd_flag :
698 * 0. The system BIOS should automatically control the brightness level
699 * of the LCD when:
700 * - the power changes from AC to DC (ACPI appendix B)
701 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs)
702 * 1. The system BIOS should NOT automatically control the brightness
703 * level of the LCD when:
704 * - the power changes from AC to DC (ACPI appendix B)
705 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs)
706 * Return Value:
707 * -EINVAL wrong arg.
708 */
709
710 static int
acpi_video_bus_DOS(struct acpi_video_bus * video,int bios_flag,int lcd_flag)711 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
712 {
713 acpi_status status;
714
715 if (!video->cap._DOS)
716 return 0;
717
718 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
719 return -EINVAL;
720 video->dos_setting = (lcd_flag << 2) | bios_flag;
721 status = acpi_execute_simple_method(video->device->handle, "_DOS",
722 (lcd_flag << 2) | bios_flag);
723 if (ACPI_FAILURE(status))
724 return -EIO;
725
726 return 0;
727 }
728
729 /*
730 * Simple comparison function used to sort backlight levels.
731 */
732
733 static int
acpi_video_cmp_level(const void * a,const void * b)734 acpi_video_cmp_level(const void *a, const void *b)
735 {
736 return *(int *)a - *(int *)b;
737 }
738
739 /*
740 * Decides if _BQC/_BCQ for this system is usable
741 *
742 * We do this by changing the level first and then read out the current
743 * brightness level, if the value does not match, find out if it is using
744 * index. If not, clear the _BQC/_BCQ capability.
745 */
acpi_video_bqc_quirk(struct acpi_video_device * device,int max_level,int current_level)746 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
747 int max_level, int current_level)
748 {
749 struct acpi_video_device_brightness *br = device->brightness;
750 int result;
751 unsigned long long level;
752 int test_level;
753
754 /* don't mess with existing known broken systems */
755 if (bqc_offset_aml_bug_workaround)
756 return 0;
757
758 /*
759 * Some systems always report current brightness level as maximum
760 * through _BQC, we need to test another value for them. However,
761 * there is a subtlety:
762 *
763 * If the _BCL package ordering is descending, the first level
764 * (br->levels[2]) is likely to be 0, and if the number of levels
765 * matches the number of steps, we might confuse a returned level to
766 * mean the index.
767 *
768 * For example:
769 *
770 * current_level = max_level = 100
771 * test_level = 0
772 * returned level = 100
773 *
774 * In this case 100 means the level, not the index, and _BCM failed.
775 * Still, if the _BCL package ordering is descending, the index of
776 * level 0 is also 100, so we assume _BQC is indexed, when it's not.
777 *
778 * This causes all _BQC calls to return bogus values causing weird
779 * behavior from the user's perspective. For example:
780 *
781 * xbacklight -set 10; xbacklight -set 20;
782 *
783 * would flash to 90% and then slowly down to the desired level (20).
784 *
785 * The solution is simple; test anything other than the first level
786 * (e.g. 1).
787 */
788 test_level = current_level == max_level
789 ? br->levels[ACPI_VIDEO_FIRST_LEVEL + 1]
790 : max_level;
791
792 result = acpi_video_device_lcd_set_level(device, test_level);
793 if (result)
794 return result;
795
796 result = acpi_video_device_lcd_get_level_current(device, &level, true);
797 if (result)
798 return result;
799
800 if (level != test_level) {
801 /* buggy _BQC found, need to find out if it uses index */
802 if (level < br->count) {
803 if (br->flags._BCL_reversed)
804 level = br->count - ACPI_VIDEO_FIRST_LEVEL - 1 - level;
805 if (br->levels[level + ACPI_VIDEO_FIRST_LEVEL] == test_level)
806 br->flags._BQC_use_index = 1;
807 }
808
809 if (!br->flags._BQC_use_index)
810 device->cap._BQC = device->cap._BCQ = 0;
811 }
812
813 return 0;
814 }
815
acpi_video_get_levels(struct acpi_device * device,struct acpi_video_device_brightness ** dev_br,int * pmax_level)816 int acpi_video_get_levels(struct acpi_device *device,
817 struct acpi_video_device_brightness **dev_br,
818 int *pmax_level)
819 {
820 union acpi_object *obj = NULL;
821 int i, max_level = 0, count = 0, level_ac_battery = 0;
822 union acpi_object *o;
823 struct acpi_video_device_brightness *br = NULL;
824 int result = 0;
825 u32 value;
826
827 if (ACPI_FAILURE(acpi_video_device_lcd_query_levels(device->handle, &obj))) {
828 acpi_handle_debug(device->handle,
829 "Could not query available LCD brightness level\n");
830 result = -ENODEV;
831 goto out;
832 }
833
834 if (obj->package.count < ACPI_VIDEO_FIRST_LEVEL) {
835 result = -EINVAL;
836 goto out;
837 }
838
839 br = kzalloc(sizeof(*br), GFP_KERNEL);
840 if (!br) {
841 result = -ENOMEM;
842 goto out;
843 }
844
845 /*
846 * Note that we have to reserve 2 extra items (ACPI_VIDEO_FIRST_LEVEL),
847 * in order to account for buggy BIOS which don't export the first two
848 * special levels (see below)
849 */
850 br->levels = kmalloc_array(obj->package.count + ACPI_VIDEO_FIRST_LEVEL,
851 sizeof(*br->levels),
852 GFP_KERNEL);
853 if (!br->levels) {
854 result = -ENOMEM;
855 goto out_free;
856 }
857
858 for (i = 0; i < obj->package.count; i++) {
859 o = (union acpi_object *)&obj->package.elements[i];
860 if (o->type != ACPI_TYPE_INTEGER) {
861 acpi_handle_info(device->handle, "Invalid data\n");
862 continue;
863 }
864 value = (u32) o->integer.value;
865 /* Skip duplicate entries */
866 if (count > ACPI_VIDEO_FIRST_LEVEL
867 && br->levels[count - 1] == value)
868 continue;
869
870 br->levels[count] = value;
871
872 if (br->levels[count] > max_level)
873 max_level = br->levels[count];
874 count++;
875 }
876
877 /*
878 * some buggy BIOS don't export the levels
879 * when machine is on AC/Battery in _BCL package.
880 * In this case, the first two elements in _BCL packages
881 * are also supported brightness levels that OS should take care of.
882 */
883 for (i = ACPI_VIDEO_FIRST_LEVEL; i < count; i++) {
884 if (br->levels[i] == br->levels[ACPI_VIDEO_AC_LEVEL])
885 level_ac_battery++;
886 if (br->levels[i] == br->levels[ACPI_VIDEO_BATTERY_LEVEL])
887 level_ac_battery++;
888 }
889
890 if (level_ac_battery < ACPI_VIDEO_FIRST_LEVEL) {
891 level_ac_battery = ACPI_VIDEO_FIRST_LEVEL - level_ac_battery;
892 br->flags._BCL_no_ac_battery_levels = 1;
893 for (i = (count - 1 + level_ac_battery);
894 i >= ACPI_VIDEO_FIRST_LEVEL; i--)
895 br->levels[i] = br->levels[i - level_ac_battery];
896 count += level_ac_battery;
897 } else if (level_ac_battery > ACPI_VIDEO_FIRST_LEVEL)
898 acpi_handle_info(device->handle,
899 "Too many duplicates in _BCL package");
900
901 /* Check if the _BCL package is in a reversed order */
902 if (max_level == br->levels[ACPI_VIDEO_FIRST_LEVEL]) {
903 br->flags._BCL_reversed = 1;
904 sort(&br->levels[ACPI_VIDEO_FIRST_LEVEL],
905 count - ACPI_VIDEO_FIRST_LEVEL,
906 sizeof(br->levels[ACPI_VIDEO_FIRST_LEVEL]),
907 acpi_video_cmp_level, NULL);
908 } else if (max_level != br->levels[count - 1])
909 acpi_handle_info(device->handle,
910 "Found unordered _BCL package");
911
912 br->count = count;
913 *dev_br = br;
914 if (pmax_level)
915 *pmax_level = max_level;
916
917 out:
918 kfree(obj);
919 return result;
920 out_free:
921 kfree(br);
922 goto out;
923 }
924 EXPORT_SYMBOL(acpi_video_get_levels);
925
926 /*
927 * Arg:
928 * device : video output device (LCD, CRT, ..)
929 *
930 * Return Value:
931 * Maximum brightness level
932 *
933 * Allocate and initialize device->brightness.
934 */
935
936 static int
acpi_video_init_brightness(struct acpi_video_device * device)937 acpi_video_init_brightness(struct acpi_video_device *device)
938 {
939 int i, max_level = 0;
940 unsigned long long level, level_old;
941 struct acpi_video_device_brightness *br = NULL;
942 int result;
943
944 result = acpi_video_get_levels(device->dev, &br, &max_level);
945 if (result)
946 return result;
947 device->brightness = br;
948
949 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
950 br->curr = level = max_level;
951
952 if (!device->cap._BQC)
953 goto set_level;
954
955 result = acpi_video_device_lcd_get_level_current(device,
956 &level_old, true);
957 if (result)
958 goto out_free_levels;
959
960 result = acpi_video_bqc_quirk(device, max_level, level_old);
961 if (result)
962 goto out_free_levels;
963 /*
964 * cap._BQC may get cleared due to _BQC is found to be broken
965 * in acpi_video_bqc_quirk, so check again here.
966 */
967 if (!device->cap._BQC)
968 goto set_level;
969
970 level = acpi_video_bqc_value_to_level(device, level_old);
971 /*
972 * On some buggy laptops, _BQC returns an uninitialized
973 * value when invoked for the first time, i.e.
974 * level_old is invalid (no matter whether it's a level
975 * or an index). Set the backlight to max_level in this case.
976 */
977 for (i = ACPI_VIDEO_FIRST_LEVEL; i < br->count; i++)
978 if (level == br->levels[i])
979 break;
980 if (i == br->count || !level)
981 level = max_level;
982
983 set_level:
984 result = acpi_video_device_lcd_set_level(device, level);
985 if (result)
986 goto out_free_levels;
987
988 acpi_handle_debug(device->dev->handle, "found %d brightness levels\n",
989 br->count - ACPI_VIDEO_FIRST_LEVEL);
990
991 return 0;
992
993 out_free_levels:
994 kfree(br->levels);
995 kfree(br);
996 device->brightness = NULL;
997 return result;
998 }
999
1000 /*
1001 * Arg:
1002 * device : video output device (LCD, CRT, ..)
1003 *
1004 * Return Value:
1005 * None
1006 *
1007 * Find out all required AML methods defined under the output
1008 * device.
1009 */
1010
acpi_video_device_find_cap(struct acpi_video_device * device)1011 static void acpi_video_device_find_cap(struct acpi_video_device *device)
1012 {
1013 if (acpi_has_method(device->dev->handle, "_ADR"))
1014 device->cap._ADR = 1;
1015 if (acpi_has_method(device->dev->handle, "_BCL"))
1016 device->cap._BCL = 1;
1017 if (acpi_has_method(device->dev->handle, "_BCM"))
1018 device->cap._BCM = 1;
1019 if (acpi_has_method(device->dev->handle, "_BQC")) {
1020 device->cap._BQC = 1;
1021 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
1022 acpi_handle_info(device->dev->handle,
1023 "_BCQ is used instead of _BQC\n");
1024 device->cap._BCQ = 1;
1025 }
1026
1027 if (acpi_has_method(device->dev->handle, "_DDC"))
1028 device->cap._DDC = 1;
1029 }
1030
1031 /*
1032 * Arg:
1033 * device : video output device (VGA)
1034 *
1035 * Return Value:
1036 * None
1037 *
1038 * Find out all required AML methods defined under the video bus device.
1039 */
1040
acpi_video_bus_find_cap(struct acpi_video_bus * video)1041 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1042 {
1043 if (acpi_has_method(video->device->handle, "_DOS"))
1044 video->cap._DOS = 1;
1045 if (acpi_has_method(video->device->handle, "_DOD"))
1046 video->cap._DOD = 1;
1047 if (acpi_has_method(video->device->handle, "_ROM"))
1048 video->cap._ROM = 1;
1049 if (acpi_has_method(video->device->handle, "_GPD"))
1050 video->cap._GPD = 1;
1051 if (acpi_has_method(video->device->handle, "_SPD"))
1052 video->cap._SPD = 1;
1053 if (acpi_has_method(video->device->handle, "_VPO"))
1054 video->cap._VPO = 1;
1055 }
1056
1057 /*
1058 * Check whether the video bus device has required AML method to
1059 * support the desired features
1060 */
1061
acpi_video_bus_check(struct acpi_video_bus * video)1062 static int acpi_video_bus_check(struct acpi_video_bus *video)
1063 {
1064 acpi_status status = -ENOENT;
1065 struct pci_dev *dev;
1066
1067 if (!video)
1068 return -EINVAL;
1069
1070 dev = acpi_get_pci_dev(video->device->handle);
1071 if (!dev)
1072 return -ENODEV;
1073 pci_dev_put(dev);
1074
1075 /*
1076 * Since there is no HID, CID and so on for VGA driver, we have
1077 * to check well known required nodes.
1078 */
1079
1080 /* Does this device support video switching? */
1081 if (video->cap._DOS || video->cap._DOD) {
1082 if (!video->cap._DOS) {
1083 pr_info(FW_BUG "ACPI(%s) defines _DOD but not _DOS\n",
1084 acpi_device_bid(video->device));
1085 }
1086 video->flags.multihead = 1;
1087 status = 0;
1088 }
1089
1090 /* Does this device support retrieving a video ROM? */
1091 if (video->cap._ROM) {
1092 video->flags.rom = 1;
1093 status = 0;
1094 }
1095
1096 /* Does this device support configuring which video device to POST? */
1097 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1098 video->flags.post = 1;
1099 status = 0;
1100 }
1101
1102 return status;
1103 }
1104
1105 /*
1106 * --------------------------------------------------------------------------
1107 * Driver Interface
1108 * --------------------------------------------------------------------------
1109 */
1110
1111 /* device interface */
1112 static struct acpi_video_device_attrib *
acpi_video_get_device_attr(struct acpi_video_bus * video,unsigned long device_id)1113 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1114 {
1115 struct acpi_video_enumerated_device *ids;
1116 int i;
1117
1118 for (i = 0; i < video->attached_count; i++) {
1119 ids = &video->attached_array[i];
1120 if ((ids->value.int_val & 0xffff) == device_id)
1121 return &ids->value.attrib;
1122 }
1123
1124 return NULL;
1125 }
1126
1127 static int
acpi_video_get_device_type(struct acpi_video_bus * video,unsigned long device_id)1128 acpi_video_get_device_type(struct acpi_video_bus *video,
1129 unsigned long device_id)
1130 {
1131 struct acpi_video_enumerated_device *ids;
1132 int i;
1133
1134 for (i = 0; i < video->attached_count; i++) {
1135 ids = &video->attached_array[i];
1136 if ((ids->value.int_val & 0xffff) == device_id)
1137 return ids->value.int_val;
1138 }
1139
1140 return 0;
1141 }
1142
1143 static int
acpi_video_bus_get_one_device(struct acpi_device * device,struct acpi_video_bus * video)1144 acpi_video_bus_get_one_device(struct acpi_device *device,
1145 struct acpi_video_bus *video)
1146 {
1147 unsigned long long device_id;
1148 int status, device_type;
1149 struct acpi_video_device *data;
1150 struct acpi_video_device_attrib *attribute;
1151
1152 status =
1153 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1154 /* Some device omits _ADR, we skip them instead of fail */
1155 if (ACPI_FAILURE(status))
1156 return 0;
1157
1158 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1159 if (!data)
1160 return -ENOMEM;
1161
1162 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1163 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1164 device->driver_data = data;
1165
1166 data->device_id = device_id;
1167 data->video = video;
1168 data->dev = device;
1169 INIT_DELAYED_WORK(&data->switch_brightness_work,
1170 acpi_video_switch_brightness);
1171
1172 attribute = acpi_video_get_device_attr(video, device_id);
1173
1174 if (attribute && (attribute->device_id_scheme || device_id_scheme)) {
1175 switch (attribute->display_type) {
1176 case ACPI_VIDEO_DISPLAY_CRT:
1177 data->flags.crt = 1;
1178 break;
1179 case ACPI_VIDEO_DISPLAY_TV:
1180 data->flags.tvout = 1;
1181 break;
1182 case ACPI_VIDEO_DISPLAY_DVI:
1183 data->flags.dvi = 1;
1184 break;
1185 case ACPI_VIDEO_DISPLAY_LCD:
1186 data->flags.lcd = 1;
1187 break;
1188 default:
1189 data->flags.unknown = 1;
1190 break;
1191 }
1192 if (attribute->bios_can_detect)
1193 data->flags.bios = 1;
1194 } else {
1195 /* Check for legacy IDs */
1196 device_type = acpi_video_get_device_type(video, device_id);
1197 /* Ignore bits 16 and 18-20 */
1198 switch (device_type & 0xffe2ffff) {
1199 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1200 data->flags.crt = 1;
1201 break;
1202 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1203 data->flags.lcd = 1;
1204 break;
1205 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1206 data->flags.tvout = 1;
1207 break;
1208 default:
1209 data->flags.unknown = 1;
1210 }
1211 }
1212
1213 acpi_video_device_bind(video, data);
1214 acpi_video_device_find_cap(data);
1215
1216 mutex_lock(&video->device_list_lock);
1217 list_add_tail(&data->entry, &video->video_device_list);
1218 mutex_unlock(&video->device_list_lock);
1219
1220 return status;
1221 }
1222
1223 /*
1224 * Arg:
1225 * video : video bus device
1226 *
1227 * Return:
1228 * none
1229 *
1230 * Enumerate the video device list of the video bus,
1231 * bind the ids with the corresponding video devices
1232 * under the video bus.
1233 */
1234
acpi_video_device_rebind(struct acpi_video_bus * video)1235 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1236 {
1237 struct acpi_video_device *dev;
1238
1239 mutex_lock(&video->device_list_lock);
1240
1241 list_for_each_entry(dev, &video->video_device_list, entry)
1242 acpi_video_device_bind(video, dev);
1243
1244 mutex_unlock(&video->device_list_lock);
1245 }
1246
1247 /*
1248 * Arg:
1249 * video : video bus device
1250 * device : video output device under the video
1251 * bus
1252 *
1253 * Return:
1254 * none
1255 *
1256 * Bind the ids with the corresponding video devices
1257 * under the video bus.
1258 */
1259
1260 static void
acpi_video_device_bind(struct acpi_video_bus * video,struct acpi_video_device * device)1261 acpi_video_device_bind(struct acpi_video_bus *video,
1262 struct acpi_video_device *device)
1263 {
1264 struct acpi_video_enumerated_device *ids;
1265 int i;
1266
1267 for (i = 0; i < video->attached_count; i++) {
1268 ids = &video->attached_array[i];
1269 if (device->device_id == (ids->value.int_val & 0xffff)) {
1270 ids->bind_info = device;
1271 acpi_handle_debug(video->device->handle, "%s: %d\n",
1272 __func__, i);
1273 }
1274 }
1275 }
1276
acpi_video_device_in_dod(struct acpi_video_device * device)1277 static bool acpi_video_device_in_dod(struct acpi_video_device *device)
1278 {
1279 struct acpi_video_bus *video = device->video;
1280 int i;
1281
1282 /*
1283 * If we have a broken _DOD or we have more than 8 output devices
1284 * under the graphics controller node that we can't proper deal with
1285 * in the operation region code currently, no need to test.
1286 */
1287 if (!video->attached_count || video->child_count > 8)
1288 return true;
1289
1290 for (i = 0; i < video->attached_count; i++) {
1291 if ((video->attached_array[i].value.int_val & 0xfff) ==
1292 (device->device_id & 0xfff))
1293 return true;
1294 }
1295
1296 return false;
1297 }
1298
1299 /*
1300 * Arg:
1301 * video : video bus device
1302 *
1303 * Return:
1304 * < 0 : error
1305 *
1306 * Call _DOD to enumerate all devices attached to display adapter
1307 *
1308 */
1309
acpi_video_device_enumerate(struct acpi_video_bus * video)1310 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1311 {
1312 int status;
1313 int count;
1314 int i;
1315 struct acpi_video_enumerated_device *active_list;
1316 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1317 union acpi_object *dod = NULL;
1318 union acpi_object *obj;
1319
1320 if (!video->cap._DOD)
1321 return AE_NOT_EXIST;
1322
1323 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1324 if (ACPI_FAILURE(status)) {
1325 acpi_handle_info(video->device->handle,
1326 "_DOD evaluation failed: %s\n",
1327 acpi_format_exception(status));
1328 return status;
1329 }
1330
1331 dod = buffer.pointer;
1332 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1333 acpi_handle_info(video->device->handle, "Invalid _DOD data\n");
1334 status = -EFAULT;
1335 goto out;
1336 }
1337
1338 acpi_handle_debug(video->device->handle, "Found %d video heads in _DOD\n",
1339 dod->package.count);
1340
1341 active_list = kcalloc(1 + dod->package.count,
1342 sizeof(struct acpi_video_enumerated_device),
1343 GFP_KERNEL);
1344 if (!active_list) {
1345 status = -ENOMEM;
1346 goto out;
1347 }
1348
1349 count = 0;
1350 for (i = 0; i < dod->package.count; i++) {
1351 obj = &dod->package.elements[i];
1352
1353 if (obj->type != ACPI_TYPE_INTEGER) {
1354 acpi_handle_info(video->device->handle,
1355 "Invalid _DOD data in element %d\n", i);
1356 continue;
1357 }
1358
1359 active_list[count].value.int_val = obj->integer.value;
1360 active_list[count].bind_info = NULL;
1361
1362 acpi_handle_debug(video->device->handle,
1363 "_DOD element[%d] = %d\n", i,
1364 (int)obj->integer.value);
1365
1366 count++;
1367 }
1368
1369 kfree(video->attached_array);
1370
1371 video->attached_array = active_list;
1372 video->attached_count = count;
1373
1374 out:
1375 kfree(buffer.pointer);
1376 return status;
1377 }
1378
1379 static int
acpi_video_get_next_level(struct acpi_video_device * device,u32 level_current,u32 event)1380 acpi_video_get_next_level(struct acpi_video_device *device,
1381 u32 level_current, u32 event)
1382 {
1383 int min, max, min_above, max_below, i, l, delta = 255;
1384 max = max_below = 0;
1385 min = min_above = 255;
1386 /* Find closest level to level_current */
1387 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) {
1388 l = device->brightness->levels[i];
1389 if (abs(l - level_current) < abs(delta)) {
1390 delta = l - level_current;
1391 if (!delta)
1392 break;
1393 }
1394 }
1395 /* Adjust level_current to closest available level */
1396 level_current += delta;
1397 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) {
1398 l = device->brightness->levels[i];
1399 if (l < min)
1400 min = l;
1401 if (l > max)
1402 max = l;
1403 if (l < min_above && l > level_current)
1404 min_above = l;
1405 if (l > max_below && l < level_current)
1406 max_below = l;
1407 }
1408
1409 switch (event) {
1410 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1411 return (level_current < max) ? min_above : min;
1412 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1413 return (level_current < max) ? min_above : max;
1414 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1415 return (level_current > min) ? max_below : min;
1416 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1417 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1418 return 0;
1419 default:
1420 return level_current;
1421 }
1422 }
1423
1424 static void
acpi_video_switch_brightness(struct work_struct * work)1425 acpi_video_switch_brightness(struct work_struct *work)
1426 {
1427 struct acpi_video_device *device = container_of(to_delayed_work(work),
1428 struct acpi_video_device, switch_brightness_work);
1429 unsigned long long level_current, level_next;
1430 int event = device->switch_brightness_event;
1431 int result = -EINVAL;
1432
1433 /* no warning message if acpi_backlight=vendor or a quirk is used */
1434 if (!device->backlight)
1435 return;
1436
1437 if (!device->brightness)
1438 goto out;
1439
1440 result = acpi_video_device_lcd_get_level_current(device,
1441 &level_current,
1442 false);
1443 if (result)
1444 goto out;
1445
1446 level_next = acpi_video_get_next_level(device, level_current, event);
1447
1448 result = acpi_video_device_lcd_set_level(device, level_next);
1449
1450 if (!result)
1451 backlight_force_update(device->backlight,
1452 BACKLIGHT_UPDATE_HOTKEY);
1453
1454 out:
1455 if (result)
1456 acpi_handle_info(device->dev->handle,
1457 "Failed to switch brightness\n");
1458 }
1459
acpi_video_get_edid(struct acpi_device * device,int type,int device_id,void ** edid)1460 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1461 void **edid)
1462 {
1463 struct acpi_video_bus *video;
1464 struct acpi_video_device *video_device;
1465 union acpi_object *buffer = NULL;
1466 acpi_status status;
1467 int i, length;
1468
1469 if (!device || !acpi_driver_data(device))
1470 return -EINVAL;
1471
1472 video = acpi_driver_data(device);
1473
1474 for (i = 0; i < video->attached_count; i++) {
1475 video_device = video->attached_array[i].bind_info;
1476 length = 256;
1477
1478 if (!video_device)
1479 continue;
1480
1481 if (!video_device->cap._DDC)
1482 continue;
1483
1484 if (type) {
1485 switch (type) {
1486 case ACPI_VIDEO_DISPLAY_CRT:
1487 if (!video_device->flags.crt)
1488 continue;
1489 break;
1490 case ACPI_VIDEO_DISPLAY_TV:
1491 if (!video_device->flags.tvout)
1492 continue;
1493 break;
1494 case ACPI_VIDEO_DISPLAY_DVI:
1495 if (!video_device->flags.dvi)
1496 continue;
1497 break;
1498 case ACPI_VIDEO_DISPLAY_LCD:
1499 if (!video_device->flags.lcd)
1500 continue;
1501 break;
1502 }
1503 } else if (video_device->device_id != device_id) {
1504 continue;
1505 }
1506
1507 status = acpi_video_device_EDID(video_device, &buffer, length);
1508
1509 if (ACPI_FAILURE(status) || !buffer ||
1510 buffer->type != ACPI_TYPE_BUFFER) {
1511 length = 128;
1512 status = acpi_video_device_EDID(video_device, &buffer,
1513 length);
1514 if (ACPI_FAILURE(status) || !buffer ||
1515 buffer->type != ACPI_TYPE_BUFFER) {
1516 continue;
1517 }
1518 }
1519
1520 *edid = buffer->buffer.pointer;
1521 return length;
1522 }
1523
1524 return -ENODEV;
1525 }
1526 EXPORT_SYMBOL(acpi_video_get_edid);
1527
1528 static int
acpi_video_bus_get_devices(struct acpi_video_bus * video,struct acpi_device * device)1529 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1530 struct acpi_device *device)
1531 {
1532 int status = 0;
1533 struct acpi_device *dev;
1534
1535 /*
1536 * There are systems where video module known to work fine regardless
1537 * of broken _DOD and ignoring returned value here doesn't cause
1538 * any issues later.
1539 */
1540 acpi_video_device_enumerate(video);
1541
1542 list_for_each_entry(dev, &device->children, node) {
1543
1544 status = acpi_video_bus_get_one_device(dev, video);
1545 if (status) {
1546 dev_err(&dev->dev, "Can't attach device\n");
1547 break;
1548 }
1549 video->child_count++;
1550 }
1551 return status;
1552 }
1553
1554 /* acpi_video interface */
1555
1556 /*
1557 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1558 * perform any automatic brightness change on receiving a notification.
1559 */
acpi_video_bus_start_devices(struct acpi_video_bus * video)1560 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1561 {
1562 return acpi_video_bus_DOS(video, 0,
1563 acpi_osi_is_win8() ? 1 : 0);
1564 }
1565
acpi_video_bus_stop_devices(struct acpi_video_bus * video)1566 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1567 {
1568 return acpi_video_bus_DOS(video, 0,
1569 acpi_osi_is_win8() ? 0 : 1);
1570 }
1571
acpi_video_bus_notify(struct acpi_device * device,u32 event)1572 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1573 {
1574 struct acpi_video_bus *video = acpi_driver_data(device);
1575 struct input_dev *input;
1576 int keycode = 0;
1577
1578 if (!video || !video->input)
1579 return;
1580
1581 input = video->input;
1582
1583 switch (event) {
1584 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1585 * most likely via hotkey. */
1586 keycode = KEY_SWITCHVIDEOMODE;
1587 break;
1588
1589 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1590 * connector. */
1591 acpi_video_device_enumerate(video);
1592 acpi_video_device_rebind(video);
1593 keycode = KEY_SWITCHVIDEOMODE;
1594 break;
1595
1596 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1597 keycode = KEY_SWITCHVIDEOMODE;
1598 break;
1599 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1600 keycode = KEY_VIDEO_NEXT;
1601 break;
1602 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1603 keycode = KEY_VIDEO_PREV;
1604 break;
1605
1606 default:
1607 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
1608 event);
1609 break;
1610 }
1611
1612 if (acpi_notifier_call_chain(device, event, 0))
1613 /* Something vetoed the keypress. */
1614 keycode = 0;
1615
1616 if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) {
1617 input_report_key(input, keycode, 1);
1618 input_sync(input);
1619 input_report_key(input, keycode, 0);
1620 input_sync(input);
1621 }
1622
1623 return;
1624 }
1625
brightness_switch_event(struct acpi_video_device * video_device,u32 event)1626 static void brightness_switch_event(struct acpi_video_device *video_device,
1627 u32 event)
1628 {
1629 if (!brightness_switch_enabled)
1630 return;
1631
1632 video_device->switch_brightness_event = event;
1633 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1634 }
1635
acpi_video_device_notify(acpi_handle handle,u32 event,void * data)1636 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1637 {
1638 struct acpi_video_device *video_device = data;
1639 struct acpi_device *device = NULL;
1640 struct acpi_video_bus *bus;
1641 struct input_dev *input;
1642 int keycode = 0;
1643
1644 if (!video_device)
1645 return;
1646
1647 device = video_device->dev;
1648 bus = video_device->video;
1649 input = bus->input;
1650
1651 if (hw_changes_brightness > 0) {
1652 if (video_device->backlight)
1653 backlight_force_update(video_device->backlight,
1654 BACKLIGHT_UPDATE_HOTKEY);
1655 acpi_notifier_call_chain(device, event, 0);
1656 return;
1657 }
1658
1659 switch (event) {
1660 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1661 brightness_switch_event(video_device, event);
1662 keycode = KEY_BRIGHTNESS_CYCLE;
1663 break;
1664 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1665 brightness_switch_event(video_device, event);
1666 keycode = KEY_BRIGHTNESSUP;
1667 break;
1668 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1669 brightness_switch_event(video_device, event);
1670 keycode = KEY_BRIGHTNESSDOWN;
1671 break;
1672 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1673 brightness_switch_event(video_device, event);
1674 keycode = KEY_BRIGHTNESS_ZERO;
1675 break;
1676 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1677 brightness_switch_event(video_device, event);
1678 keycode = KEY_DISPLAY_OFF;
1679 break;
1680 default:
1681 acpi_handle_debug(handle, "Unsupported event [0x%x]\n", event);
1682 break;
1683 }
1684
1685 acpi_notifier_call_chain(device, event, 0);
1686
1687 if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) {
1688 input_report_key(input, keycode, 1);
1689 input_sync(input);
1690 input_report_key(input, keycode, 0);
1691 input_sync(input);
1692 }
1693
1694 return;
1695 }
1696
acpi_video_resume(struct notifier_block * nb,unsigned long val,void * ign)1697 static int acpi_video_resume(struct notifier_block *nb,
1698 unsigned long val, void *ign)
1699 {
1700 struct acpi_video_bus *video;
1701 struct acpi_video_device *video_device;
1702 int i;
1703
1704 switch (val) {
1705 case PM_HIBERNATION_PREPARE:
1706 case PM_SUSPEND_PREPARE:
1707 case PM_RESTORE_PREPARE:
1708 return NOTIFY_DONE;
1709 }
1710
1711 video = container_of(nb, struct acpi_video_bus, pm_nb);
1712
1713 dev_info(&video->device->dev, "Restoring backlight state\n");
1714
1715 for (i = 0; i < video->attached_count; i++) {
1716 video_device = video->attached_array[i].bind_info;
1717 if (video_device && video_device->brightness)
1718 acpi_video_device_lcd_set_level(video_device,
1719 video_device->brightness->curr);
1720 }
1721
1722 return NOTIFY_OK;
1723 }
1724
1725 static acpi_status
acpi_video_bus_match(acpi_handle handle,u32 level,void * context,void ** return_value)1726 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1727 void **return_value)
1728 {
1729 struct acpi_device *device = context;
1730 struct acpi_device *sibling;
1731 int result;
1732
1733 if (handle == device->handle)
1734 return AE_CTRL_TERMINATE;
1735
1736 result = acpi_bus_get_device(handle, &sibling);
1737 if (result)
1738 return AE_OK;
1739
1740 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1741 return AE_ALREADY_EXISTS;
1742
1743 return AE_OK;
1744 }
1745
acpi_video_dev_register_backlight(struct acpi_video_device * device)1746 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1747 {
1748 struct backlight_properties props;
1749 struct pci_dev *pdev;
1750 acpi_handle acpi_parent;
1751 struct device *parent = NULL;
1752 int result;
1753 static int count;
1754 char *name;
1755
1756 result = acpi_video_init_brightness(device);
1757 if (result)
1758 return;
1759
1760 if (disable_backlight_sysfs_if > 0)
1761 return;
1762
1763 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1764 if (!name)
1765 return;
1766 count++;
1767
1768 acpi_get_parent(device->dev->handle, &acpi_parent);
1769
1770 pdev = acpi_get_pci_dev(acpi_parent);
1771 if (pdev) {
1772 parent = &pdev->dev;
1773 pci_dev_put(pdev);
1774 }
1775
1776 memset(&props, 0, sizeof(struct backlight_properties));
1777 props.type = BACKLIGHT_FIRMWARE;
1778 props.max_brightness =
1779 device->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1;
1780 device->backlight = backlight_device_register(name,
1781 parent,
1782 device,
1783 &acpi_backlight_ops,
1784 &props);
1785 kfree(name);
1786 if (IS_ERR(device->backlight)) {
1787 device->backlight = NULL;
1788 return;
1789 }
1790
1791 /*
1792 * Save current brightness level in case we have to restore it
1793 * before acpi_video_device_lcd_set_level() is called next time.
1794 */
1795 device->backlight->props.brightness =
1796 acpi_video_get_brightness(device->backlight);
1797
1798 device->cooling_dev = thermal_cooling_device_register("LCD",
1799 device->dev, &video_cooling_ops);
1800 if (IS_ERR(device->cooling_dev)) {
1801 /*
1802 * Set cooling_dev to NULL so we don't crash trying to free it.
1803 * Also, why the hell we are returning early and not attempt to
1804 * register video output if cooling device registration failed?
1805 * -- dtor
1806 */
1807 device->cooling_dev = NULL;
1808 return;
1809 }
1810
1811 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1812 device->cooling_dev->id);
1813 result = sysfs_create_link(&device->dev->dev.kobj,
1814 &device->cooling_dev->device.kobj,
1815 "thermal_cooling");
1816 if (result)
1817 pr_info("sysfs link creation failed\n");
1818
1819 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1820 &device->dev->dev.kobj, "device");
1821 if (result)
1822 pr_info("Reverse sysfs link creation failed\n");
1823 }
1824
acpi_video_run_bcl_for_osi(struct acpi_video_bus * video)1825 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)
1826 {
1827 struct acpi_video_device *dev;
1828 union acpi_object *levels;
1829
1830 mutex_lock(&video->device_list_lock);
1831 list_for_each_entry(dev, &video->video_device_list, entry) {
1832 if (!acpi_video_device_lcd_query_levels(dev->dev->handle, &levels))
1833 kfree(levels);
1834 }
1835 mutex_unlock(&video->device_list_lock);
1836 }
1837
acpi_video_should_register_backlight(struct acpi_video_device * dev)1838 static bool acpi_video_should_register_backlight(struct acpi_video_device *dev)
1839 {
1840 /*
1841 * Do not create backlight device for video output
1842 * device that is not in the enumerated list.
1843 */
1844 if (!acpi_video_device_in_dod(dev)) {
1845 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n");
1846 return false;
1847 }
1848
1849 if (only_lcd)
1850 return dev->flags.lcd;
1851 return true;
1852 }
1853
acpi_video_bus_register_backlight(struct acpi_video_bus * video)1854 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1855 {
1856 struct acpi_video_device *dev;
1857
1858 if (video->backlight_registered)
1859 return 0;
1860
1861 acpi_video_run_bcl_for_osi(video);
1862
1863 if (acpi_video_get_backlight_type() != acpi_backlight_video)
1864 return 0;
1865
1866 mutex_lock(&video->device_list_lock);
1867 list_for_each_entry(dev, &video->video_device_list, entry) {
1868 if (acpi_video_should_register_backlight(dev))
1869 acpi_video_dev_register_backlight(dev);
1870 }
1871 mutex_unlock(&video->device_list_lock);
1872
1873 video->backlight_registered = true;
1874
1875 video->pm_nb.notifier_call = acpi_video_resume;
1876 video->pm_nb.priority = 0;
1877 return register_pm_notifier(&video->pm_nb);
1878 }
1879
acpi_video_dev_unregister_backlight(struct acpi_video_device * device)1880 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1881 {
1882 if (device->backlight) {
1883 backlight_device_unregister(device->backlight);
1884 device->backlight = NULL;
1885 }
1886 if (device->brightness) {
1887 kfree(device->brightness->levels);
1888 kfree(device->brightness);
1889 device->brightness = NULL;
1890 }
1891 if (device->cooling_dev) {
1892 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1893 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1894 thermal_cooling_device_unregister(device->cooling_dev);
1895 device->cooling_dev = NULL;
1896 }
1897 }
1898
acpi_video_bus_unregister_backlight(struct acpi_video_bus * video)1899 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1900 {
1901 struct acpi_video_device *dev;
1902 int error;
1903
1904 if (!video->backlight_registered)
1905 return 0;
1906
1907 error = unregister_pm_notifier(&video->pm_nb);
1908
1909 mutex_lock(&video->device_list_lock);
1910 list_for_each_entry(dev, &video->video_device_list, entry)
1911 acpi_video_dev_unregister_backlight(dev);
1912 mutex_unlock(&video->device_list_lock);
1913
1914 video->backlight_registered = false;
1915
1916 return error;
1917 }
1918
acpi_video_dev_add_notify_handler(struct acpi_video_device * device)1919 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1920 {
1921 acpi_status status;
1922 struct acpi_device *adev = device->dev;
1923
1924 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1925 acpi_video_device_notify, device);
1926 if (ACPI_FAILURE(status))
1927 dev_err(&adev->dev, "Error installing notify handler\n");
1928 else
1929 device->flags.notify = 1;
1930 }
1931
acpi_video_bus_add_notify_handler(struct acpi_video_bus * video)1932 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1933 {
1934 struct input_dev *input;
1935 struct acpi_video_device *dev;
1936 int error;
1937
1938 video->input = input = input_allocate_device();
1939 if (!input) {
1940 error = -ENOMEM;
1941 goto out;
1942 }
1943
1944 error = acpi_video_bus_start_devices(video);
1945 if (error)
1946 goto err_free_input;
1947
1948 snprintf(video->phys, sizeof(video->phys),
1949 "%s/video/input0", acpi_device_hid(video->device));
1950
1951 input->name = acpi_device_name(video->device);
1952 input->phys = video->phys;
1953 input->id.bustype = BUS_HOST;
1954 input->id.product = 0x06;
1955 input->dev.parent = &video->device->dev;
1956 input->evbit[0] = BIT(EV_KEY);
1957 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1958 set_bit(KEY_VIDEO_NEXT, input->keybit);
1959 set_bit(KEY_VIDEO_PREV, input->keybit);
1960 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1961 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1962 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1963 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1964 set_bit(KEY_DISPLAY_OFF, input->keybit);
1965
1966 error = input_register_device(input);
1967 if (error)
1968 goto err_stop_dev;
1969
1970 mutex_lock(&video->device_list_lock);
1971 list_for_each_entry(dev, &video->video_device_list, entry)
1972 acpi_video_dev_add_notify_handler(dev);
1973 mutex_unlock(&video->device_list_lock);
1974
1975 return 0;
1976
1977 err_stop_dev:
1978 acpi_video_bus_stop_devices(video);
1979 err_free_input:
1980 input_free_device(input);
1981 video->input = NULL;
1982 out:
1983 return error;
1984 }
1985
acpi_video_dev_remove_notify_handler(struct acpi_video_device * dev)1986 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1987 {
1988 if (dev->flags.notify) {
1989 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1990 acpi_video_device_notify);
1991 dev->flags.notify = 0;
1992 }
1993 }
1994
acpi_video_bus_remove_notify_handler(struct acpi_video_bus * video)1995 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1996 {
1997 struct acpi_video_device *dev;
1998
1999 mutex_lock(&video->device_list_lock);
2000 list_for_each_entry(dev, &video->video_device_list, entry)
2001 acpi_video_dev_remove_notify_handler(dev);
2002 mutex_unlock(&video->device_list_lock);
2003
2004 acpi_video_bus_stop_devices(video);
2005 input_unregister_device(video->input);
2006 video->input = NULL;
2007 }
2008
acpi_video_bus_put_devices(struct acpi_video_bus * video)2009 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2010 {
2011 struct acpi_video_device *dev, *next;
2012
2013 mutex_lock(&video->device_list_lock);
2014 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2015 list_del(&dev->entry);
2016 kfree(dev);
2017 }
2018 mutex_unlock(&video->device_list_lock);
2019
2020 return 0;
2021 }
2022
2023 static int instance;
2024
acpi_video_bus_add(struct acpi_device * device)2025 static int acpi_video_bus_add(struct acpi_device *device)
2026 {
2027 struct acpi_video_bus *video;
2028 int error;
2029 acpi_status status;
2030
2031 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
2032 device->parent->handle, 1,
2033 acpi_video_bus_match, NULL,
2034 device, NULL);
2035 if (status == AE_ALREADY_EXISTS) {
2036 pr_info(FW_BUG
2037 "Duplicate ACPI video bus devices for the"
2038 " same VGA controller, please try module "
2039 "parameter \"video.allow_duplicates=1\""
2040 "if the current driver doesn't work.\n");
2041 if (!allow_duplicates)
2042 return -ENODEV;
2043 }
2044
2045 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2046 if (!video)
2047 return -ENOMEM;
2048
2049 /* a hack to fix the duplicate name "VID" problem on T61 */
2050 if (!strcmp(device->pnp.bus_id, "VID")) {
2051 if (instance)
2052 device->pnp.bus_id[3] = '0' + instance;
2053 instance++;
2054 }
2055 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2056 if (!strcmp(device->pnp.bus_id, "VGA")) {
2057 if (instance)
2058 device->pnp.bus_id[3] = '0' + instance;
2059 instance++;
2060 }
2061
2062 video->device = device;
2063 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2064 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2065 device->driver_data = video;
2066
2067 acpi_video_bus_find_cap(video);
2068 error = acpi_video_bus_check(video);
2069 if (error)
2070 goto err_free_video;
2071
2072 mutex_init(&video->device_list_lock);
2073 INIT_LIST_HEAD(&video->video_device_list);
2074
2075 error = acpi_video_bus_get_devices(video, device);
2076 if (error)
2077 goto err_put_video;
2078
2079 pr_info("%s [%s] (multi-head: %s rom: %s post: %s)\n",
2080 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2081 video->flags.multihead ? "yes" : "no",
2082 video->flags.rom ? "yes" : "no",
2083 video->flags.post ? "yes" : "no");
2084 mutex_lock(&video_list_lock);
2085 list_add_tail(&video->entry, &video_bus_head);
2086 mutex_unlock(&video_list_lock);
2087
2088 acpi_video_bus_register_backlight(video);
2089 acpi_video_bus_add_notify_handler(video);
2090
2091 return 0;
2092
2093 err_put_video:
2094 acpi_video_bus_put_devices(video);
2095 kfree(video->attached_array);
2096 err_free_video:
2097 kfree(video);
2098 device->driver_data = NULL;
2099
2100 return error;
2101 }
2102
acpi_video_bus_remove(struct acpi_device * device)2103 static int acpi_video_bus_remove(struct acpi_device *device)
2104 {
2105 struct acpi_video_bus *video = NULL;
2106
2107
2108 if (!device || !acpi_driver_data(device))
2109 return -EINVAL;
2110
2111 video = acpi_driver_data(device);
2112
2113 acpi_video_bus_remove_notify_handler(video);
2114 acpi_video_bus_unregister_backlight(video);
2115 acpi_video_bus_put_devices(video);
2116
2117 mutex_lock(&video_list_lock);
2118 list_del(&video->entry);
2119 mutex_unlock(&video_list_lock);
2120
2121 kfree(video->attached_array);
2122 kfree(video);
2123
2124 return 0;
2125 }
2126
is_i740(struct pci_dev * dev)2127 static int __init is_i740(struct pci_dev *dev)
2128 {
2129 if (dev->device == 0x00D1)
2130 return 1;
2131 if (dev->device == 0x7000)
2132 return 1;
2133 return 0;
2134 }
2135
intel_opregion_present(void)2136 static int __init intel_opregion_present(void)
2137 {
2138 int opregion = 0;
2139 struct pci_dev *dev = NULL;
2140 u32 address;
2141
2142 for_each_pci_dev(dev) {
2143 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2144 continue;
2145 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2146 continue;
2147 /* We don't want to poke around undefined i740 registers */
2148 if (is_i740(dev))
2149 continue;
2150 pci_read_config_dword(dev, 0xfc, &address);
2151 if (!address)
2152 continue;
2153 opregion = 1;
2154 }
2155 return opregion;
2156 }
2157
2158 /* Check if the chassis-type indicates there is no builtin LCD panel */
dmi_is_desktop(void)2159 static bool dmi_is_desktop(void)
2160 {
2161 const char *chassis_type;
2162 unsigned long type;
2163
2164 chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE);
2165 if (!chassis_type)
2166 return false;
2167
2168 if (kstrtoul(chassis_type, 10, &type) != 0)
2169 return false;
2170
2171 switch (type) {
2172 case 0x03: /* Desktop */
2173 case 0x04: /* Low Profile Desktop */
2174 case 0x05: /* Pizza Box */
2175 case 0x06: /* Mini Tower */
2176 case 0x07: /* Tower */
2177 case 0x10: /* Lunch Box */
2178 case 0x11: /* Main Server Chassis */
2179 return true;
2180 }
2181
2182 return false;
2183 }
2184
2185 /*
2186 * We're seeing a lot of bogus backlight interfaces on newer machines
2187 * without a LCD such as desktops, servers and HDMI sticks. Checking the
2188 * lcd flag fixes this, enable this by default on any machines which are:
2189 * 1. Win8 ready (where we also prefer the native backlight driver, so
2190 * normally the acpi_video code should not register there anyways); *and*
2191 * 2.1 Report a desktop/server DMI chassis-type, or
2192 * 2.2 Are an ACPI-reduced-hardware platform (and thus won't use the EC for
2193 backlight control)
2194 */
should_check_lcd_flag(void)2195 static bool should_check_lcd_flag(void)
2196 {
2197 if (!acpi_osi_is_win8())
2198 return false;
2199
2200 if (dmi_is_desktop())
2201 return true;
2202
2203 if (acpi_reduced_hardware())
2204 return true;
2205
2206 return false;
2207 }
2208
acpi_video_register(void)2209 int acpi_video_register(void)
2210 {
2211 int ret = 0;
2212
2213 mutex_lock(®ister_count_mutex);
2214 if (register_count) {
2215 /*
2216 * if the function of acpi_video_register is already called,
2217 * don't register the acpi_video_bus again and return no error.
2218 */
2219 goto leave;
2220 }
2221
2222 if (only_lcd == -1)
2223 only_lcd = should_check_lcd_flag();
2224
2225 dmi_check_system(video_dmi_table);
2226
2227 ret = acpi_bus_register_driver(&acpi_video_bus);
2228 if (ret)
2229 goto leave;
2230
2231 /*
2232 * When the acpi_video_bus is loaded successfully, increase
2233 * the counter reference.
2234 */
2235 register_count = 1;
2236
2237 leave:
2238 mutex_unlock(®ister_count_mutex);
2239 return ret;
2240 }
2241 EXPORT_SYMBOL(acpi_video_register);
2242
acpi_video_unregister(void)2243 void acpi_video_unregister(void)
2244 {
2245 mutex_lock(®ister_count_mutex);
2246 if (register_count) {
2247 acpi_bus_unregister_driver(&acpi_video_bus);
2248 register_count = 0;
2249 }
2250 mutex_unlock(®ister_count_mutex);
2251 }
2252 EXPORT_SYMBOL(acpi_video_unregister);
2253
acpi_video_unregister_backlight(void)2254 void acpi_video_unregister_backlight(void)
2255 {
2256 struct acpi_video_bus *video;
2257
2258 mutex_lock(®ister_count_mutex);
2259 if (register_count) {
2260 mutex_lock(&video_list_lock);
2261 list_for_each_entry(video, &video_bus_head, entry)
2262 acpi_video_bus_unregister_backlight(video);
2263 mutex_unlock(&video_list_lock);
2264 }
2265 mutex_unlock(®ister_count_mutex);
2266 }
2267
acpi_video_handles_brightness_key_presses(void)2268 bool acpi_video_handles_brightness_key_presses(void)
2269 {
2270 bool have_video_busses;
2271
2272 mutex_lock(&video_list_lock);
2273 have_video_busses = !list_empty(&video_bus_head);
2274 mutex_unlock(&video_list_lock);
2275
2276 return have_video_busses &&
2277 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS);
2278 }
2279 EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses);
2280
2281 /*
2282 * This is kind of nasty. Hardware using Intel chipsets may require
2283 * the video opregion code to be run first in order to initialise
2284 * state before any ACPI video calls are made. To handle this we defer
2285 * registration of the video class until the opregion code has run.
2286 */
2287
acpi_video_init(void)2288 static int __init acpi_video_init(void)
2289 {
2290 /*
2291 * Let the module load even if ACPI is disabled (e.g. due to
2292 * a broken BIOS) so that i915.ko can still be loaded on such
2293 * old systems without an AcpiOpRegion.
2294 *
2295 * acpi_video_register() will report -ENODEV later as well due
2296 * to acpi_disabled when i915.ko tries to register itself afterwards.
2297 */
2298 if (acpi_disabled)
2299 return 0;
2300
2301 if (intel_opregion_present())
2302 return 0;
2303
2304 return acpi_video_register();
2305 }
2306
acpi_video_exit(void)2307 static void __exit acpi_video_exit(void)
2308 {
2309 acpi_video_detect_exit();
2310 acpi_video_unregister();
2311
2312 return;
2313 }
2314
2315 module_init(acpi_video_init);
2316 module_exit(acpi_video_exit);
2317