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 */
acpi_video_get_brightness(struct backlight_device * bd)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
acpi_video_set_brightness(struct backlight_device * bd)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 */
video_get_max_state(struct thermal_cooling_device * cooling_dev,unsigned long * state)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
video_get_cur_state(struct thermal_cooling_device * cooling_dev,unsigned long * state)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
video_set_cur_state(struct thermal_cooling_device * cooling_dev,unsigned long state)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
acpi_video_device_lcd_query_levels(acpi_handle handle,union acpi_object ** levels)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
acpi_video_device_lcd_set_level(struct acpi_video_device * device,int level)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;
video_set_bqc_offset(const struct dmi_system_id * d)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
video_disable_backlight_sysfs_if(const struct dmi_system_id * d)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
video_set_device_id_scheme(const struct dmi_system_id * d)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
video_enable_only_lcd(const struct dmi_system_id * d)401 static int video_enable_only_lcd(const struct dmi_system_id *d)
402 {
403 only_lcd = true;
404 return 0;
405 }
406
video_set_report_key_events(const struct dmi_system_id * id)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
video_hw_changes_brightness(const struct dmi_system_id * d)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
acpi_video_bqc_value_to_level(struct acpi_video_device * device,unsigned long long bqc_value)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
acpi_video_device_lcd_get_level_current(struct acpi_video_device * device,unsigned long long * level,bool raw)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
acpi_video_device_EDID(struct acpi_video_device * device,union acpi_object ** edid,ssize_t length)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 the power changes from AC to DC
703 * 1. The system BIOS should NOT automatically control the brightness
704 * level of the LCD when the power changes from AC to DC.
705 * Return Value:
706 * -EINVAL wrong arg.
707 */
708
709 static int
acpi_video_bus_DOS(struct acpi_video_bus * video,int bios_flag,int lcd_flag)710 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
711 {
712 acpi_status status;
713
714 if (!video->cap._DOS)
715 return 0;
716
717 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
718 return -EINVAL;
719 video->dos_setting = (lcd_flag << 2) | bios_flag;
720 status = acpi_execute_simple_method(video->device->handle, "_DOS",
721 (lcd_flag << 2) | bios_flag);
722 if (ACPI_FAILURE(status))
723 return -EIO;
724
725 return 0;
726 }
727
728 /*
729 * Simple comparison function used to sort backlight levels.
730 */
731
732 static int
acpi_video_cmp_level(const void * a,const void * b)733 acpi_video_cmp_level(const void *a, const void *b)
734 {
735 return *(int *)a - *(int *)b;
736 }
737
738 /*
739 * Decides if _BQC/_BCQ for this system is usable
740 *
741 * We do this by changing the level first and then read out the current
742 * brightness level, if the value does not match, find out if it is using
743 * index. If not, clear the _BQC/_BCQ capability.
744 */
acpi_video_bqc_quirk(struct acpi_video_device * device,int max_level,int current_level)745 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
746 int max_level, int current_level)
747 {
748 struct acpi_video_device_brightness *br = device->brightness;
749 int result;
750 unsigned long long level;
751 int test_level;
752
753 /* don't mess with existing known broken systems */
754 if (bqc_offset_aml_bug_workaround)
755 return 0;
756
757 /*
758 * Some systems always report current brightness level as maximum
759 * through _BQC, we need to test another value for them. However,
760 * there is a subtlety:
761 *
762 * If the _BCL package ordering is descending, the first level
763 * (br->levels[2]) is likely to be 0, and if the number of levels
764 * matches the number of steps, we might confuse a returned level to
765 * mean the index.
766 *
767 * For example:
768 *
769 * current_level = max_level = 100
770 * test_level = 0
771 * returned level = 100
772 *
773 * In this case 100 means the level, not the index, and _BCM failed.
774 * Still, if the _BCL package ordering is descending, the index of
775 * level 0 is also 100, so we assume _BQC is indexed, when it's not.
776 *
777 * This causes all _BQC calls to return bogus values causing weird
778 * behavior from the user's perspective. For example:
779 *
780 * xbacklight -set 10; xbacklight -set 20;
781 *
782 * would flash to 90% and then slowly down to the desired level (20).
783 *
784 * The solution is simple; test anything other than the first level
785 * (e.g. 1).
786 */
787 test_level = current_level == max_level
788 ? br->levels[ACPI_VIDEO_FIRST_LEVEL + 1]
789 : max_level;
790
791 result = acpi_video_device_lcd_set_level(device, test_level);
792 if (result)
793 return result;
794
795 result = acpi_video_device_lcd_get_level_current(device, &level, true);
796 if (result)
797 return result;
798
799 if (level != test_level) {
800 /* buggy _BQC found, need to find out if it uses index */
801 if (level < br->count) {
802 if (br->flags._BCL_reversed)
803 level = br->count - ACPI_VIDEO_FIRST_LEVEL - 1 - level;
804 if (br->levels[level + ACPI_VIDEO_FIRST_LEVEL] == test_level)
805 br->flags._BQC_use_index = 1;
806 }
807
808 if (!br->flags._BQC_use_index)
809 device->cap._BQC = device->cap._BCQ = 0;
810 }
811
812 return 0;
813 }
814
acpi_video_get_levels(struct acpi_device * device,struct acpi_video_device_brightness ** dev_br,int * pmax_level)815 int acpi_video_get_levels(struct acpi_device *device,
816 struct acpi_video_device_brightness **dev_br,
817 int *pmax_level)
818 {
819 union acpi_object *obj = NULL;
820 int i, max_level = 0, count = 0, level_ac_battery = 0;
821 union acpi_object *o;
822 struct acpi_video_device_brightness *br = NULL;
823 int result = 0;
824 u32 value;
825
826 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device->handle,
827 &obj))) {
828 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
829 "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 printk(KERN_ERR "can't allocate memory\n");
842 result = -ENOMEM;
843 goto out;
844 }
845
846 /*
847 * Note that we have to reserve 2 extra items (ACPI_VIDEO_FIRST_LEVEL),
848 * in order to account for buggy BIOS which don't export the first two
849 * special levels (see below)
850 */
851 br->levels = kmalloc_array(obj->package.count + ACPI_VIDEO_FIRST_LEVEL,
852 sizeof(*br->levels),
853 GFP_KERNEL);
854 if (!br->levels) {
855 result = -ENOMEM;
856 goto out_free;
857 }
858
859 for (i = 0; i < obj->package.count; i++) {
860 o = (union acpi_object *)&obj->package.elements[i];
861 if (o->type != ACPI_TYPE_INTEGER) {
862 printk(KERN_ERR PREFIX "Invalid data\n");
863 continue;
864 }
865 value = (u32) o->integer.value;
866 /* Skip duplicate entries */
867 if (count > ACPI_VIDEO_FIRST_LEVEL
868 && br->levels[count - 1] == value)
869 continue;
870
871 br->levels[count] = value;
872
873 if (br->levels[count] > max_level)
874 max_level = br->levels[count];
875 count++;
876 }
877
878 /*
879 * some buggy BIOS don't export the levels
880 * when machine is on AC/Battery in _BCL package.
881 * In this case, the first two elements in _BCL packages
882 * are also supported brightness levels that OS should take care of.
883 */
884 for (i = ACPI_VIDEO_FIRST_LEVEL; i < count; i++) {
885 if (br->levels[i] == br->levels[ACPI_VIDEO_AC_LEVEL])
886 level_ac_battery++;
887 if (br->levels[i] == br->levels[ACPI_VIDEO_BATTERY_LEVEL])
888 level_ac_battery++;
889 }
890
891 if (level_ac_battery < ACPI_VIDEO_FIRST_LEVEL) {
892 level_ac_battery = ACPI_VIDEO_FIRST_LEVEL - level_ac_battery;
893 br->flags._BCL_no_ac_battery_levels = 1;
894 for (i = (count - 1 + level_ac_battery);
895 i >= ACPI_VIDEO_FIRST_LEVEL; i--)
896 br->levels[i] = br->levels[i - level_ac_battery];
897 count += level_ac_battery;
898 } else if (level_ac_battery > ACPI_VIDEO_FIRST_LEVEL)
899 ACPI_ERROR((AE_INFO, "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_ERROR((AE_INFO,
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 = -EINVAL;
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_DEBUG_PRINT((ACPI_DB_INFO,
989 "found %d brightness levels\n",
990 br->count - ACPI_VIDEO_FIRST_LEVEL));
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 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
1023 device->cap._BCQ = 1;
1024 }
1025
1026 if (acpi_has_method(device->dev->handle, "_DDC"))
1027 device->cap._DDC = 1;
1028 }
1029
1030 /*
1031 * Arg:
1032 * device : video output device (VGA)
1033 *
1034 * Return Value:
1035 * None
1036 *
1037 * Find out all required AML methods defined under the video bus device.
1038 */
1039
acpi_video_bus_find_cap(struct acpi_video_bus * video)1040 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1041 {
1042 if (acpi_has_method(video->device->handle, "_DOS"))
1043 video->cap._DOS = 1;
1044 if (acpi_has_method(video->device->handle, "_DOD"))
1045 video->cap._DOD = 1;
1046 if (acpi_has_method(video->device->handle, "_ROM"))
1047 video->cap._ROM = 1;
1048 if (acpi_has_method(video->device->handle, "_GPD"))
1049 video->cap._GPD = 1;
1050 if (acpi_has_method(video->device->handle, "_SPD"))
1051 video->cap._SPD = 1;
1052 if (acpi_has_method(video->device->handle, "_VPO"))
1053 video->cap._VPO = 1;
1054 }
1055
1056 /*
1057 * Check whether the video bus device has required AML method to
1058 * support the desired features
1059 */
1060
acpi_video_bus_check(struct acpi_video_bus * video)1061 static int acpi_video_bus_check(struct acpi_video_bus *video)
1062 {
1063 acpi_status status = -ENOENT;
1064 struct pci_dev *dev;
1065
1066 if (!video)
1067 return -EINVAL;
1068
1069 dev = acpi_get_pci_dev(video->device->handle);
1070 if (!dev)
1071 return -ENODEV;
1072 pci_dev_put(dev);
1073
1074 /*
1075 * Since there is no HID, CID and so on for VGA driver, we have
1076 * to check well known required nodes.
1077 */
1078
1079 /* Does this device support video switching? */
1080 if (video->cap._DOS || video->cap._DOD) {
1081 if (!video->cap._DOS) {
1082 printk(KERN_WARNING FW_BUG
1083 "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_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1272 }
1273 }
1274 }
1275
acpi_video_device_in_dod(struct acpi_video_device * device)1276 static bool acpi_video_device_in_dod(struct acpi_video_device *device)
1277 {
1278 struct acpi_video_bus *video = device->video;
1279 int i;
1280
1281 /*
1282 * If we have a broken _DOD or we have more than 8 output devices
1283 * under the graphics controller node that we can't proper deal with
1284 * in the operation region code currently, no need to test.
1285 */
1286 if (!video->attached_count || video->child_count > 8)
1287 return true;
1288
1289 for (i = 0; i < video->attached_count; i++) {
1290 if ((video->attached_array[i].value.int_val & 0xfff) ==
1291 (device->device_id & 0xfff))
1292 return true;
1293 }
1294
1295 return false;
1296 }
1297
1298 /*
1299 * Arg:
1300 * video : video bus device
1301 *
1302 * Return:
1303 * < 0 : error
1304 *
1305 * Call _DOD to enumerate all devices attached to display adapter
1306 *
1307 */
1308
acpi_video_device_enumerate(struct acpi_video_bus * video)1309 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1310 {
1311 int status;
1312 int count;
1313 int i;
1314 struct acpi_video_enumerated_device *active_list;
1315 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1316 union acpi_object *dod = NULL;
1317 union acpi_object *obj;
1318
1319 if (!video->cap._DOD)
1320 return AE_NOT_EXIST;
1321
1322 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1323 if (!ACPI_SUCCESS(status)) {
1324 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1325 return status;
1326 }
1327
1328 dod = buffer.pointer;
1329 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1330 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1331 status = -EFAULT;
1332 goto out;
1333 }
1334
1335 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1336 dod->package.count));
1337
1338 active_list = kcalloc(1 + dod->package.count,
1339 sizeof(struct acpi_video_enumerated_device),
1340 GFP_KERNEL);
1341 if (!active_list) {
1342 status = -ENOMEM;
1343 goto out;
1344 }
1345
1346 count = 0;
1347 for (i = 0; i < dod->package.count; i++) {
1348 obj = &dod->package.elements[i];
1349
1350 if (obj->type != ACPI_TYPE_INTEGER) {
1351 printk(KERN_ERR PREFIX
1352 "Invalid _DOD data in element %d\n", i);
1353 continue;
1354 }
1355
1356 active_list[count].value.int_val = obj->integer.value;
1357 active_list[count].bind_info = NULL;
1358 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1359 (int)obj->integer.value));
1360 count++;
1361 }
1362
1363 kfree(video->attached_array);
1364
1365 video->attached_array = active_list;
1366 video->attached_count = count;
1367
1368 out:
1369 kfree(buffer.pointer);
1370 return status;
1371 }
1372
1373 static int
acpi_video_get_next_level(struct acpi_video_device * device,u32 level_current,u32 event)1374 acpi_video_get_next_level(struct acpi_video_device *device,
1375 u32 level_current, u32 event)
1376 {
1377 int min, max, min_above, max_below, i, l, delta = 255;
1378 max = max_below = 0;
1379 min = min_above = 255;
1380 /* Find closest level to level_current */
1381 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) {
1382 l = device->brightness->levels[i];
1383 if (abs(l - level_current) < abs(delta)) {
1384 delta = l - level_current;
1385 if (!delta)
1386 break;
1387 }
1388 }
1389 /* Ajust level_current to closest available level */
1390 level_current += delta;
1391 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) {
1392 l = device->brightness->levels[i];
1393 if (l < min)
1394 min = l;
1395 if (l > max)
1396 max = l;
1397 if (l < min_above && l > level_current)
1398 min_above = l;
1399 if (l > max_below && l < level_current)
1400 max_below = l;
1401 }
1402
1403 switch (event) {
1404 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1405 return (level_current < max) ? min_above : min;
1406 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1407 return (level_current < max) ? min_above : max;
1408 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1409 return (level_current > min) ? max_below : min;
1410 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1411 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1412 return 0;
1413 default:
1414 return level_current;
1415 }
1416 }
1417
1418 static void
acpi_video_switch_brightness(struct work_struct * work)1419 acpi_video_switch_brightness(struct work_struct *work)
1420 {
1421 struct acpi_video_device *device = container_of(to_delayed_work(work),
1422 struct acpi_video_device, switch_brightness_work);
1423 unsigned long long level_current, level_next;
1424 int event = device->switch_brightness_event;
1425 int result = -EINVAL;
1426
1427 /* no warning message if acpi_backlight=vendor or a quirk is used */
1428 if (!device->backlight)
1429 return;
1430
1431 if (!device->brightness)
1432 goto out;
1433
1434 result = acpi_video_device_lcd_get_level_current(device,
1435 &level_current,
1436 false);
1437 if (result)
1438 goto out;
1439
1440 level_next = acpi_video_get_next_level(device, level_current, event);
1441
1442 result = acpi_video_device_lcd_set_level(device, level_next);
1443
1444 if (!result)
1445 backlight_force_update(device->backlight,
1446 BACKLIGHT_UPDATE_HOTKEY);
1447
1448 out:
1449 if (result)
1450 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1451 }
1452
acpi_video_get_edid(struct acpi_device * device,int type,int device_id,void ** edid)1453 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1454 void **edid)
1455 {
1456 struct acpi_video_bus *video;
1457 struct acpi_video_device *video_device;
1458 union acpi_object *buffer = NULL;
1459 acpi_status status;
1460 int i, length;
1461
1462 if (!device || !acpi_driver_data(device))
1463 return -EINVAL;
1464
1465 video = acpi_driver_data(device);
1466
1467 for (i = 0; i < video->attached_count; i++) {
1468 video_device = video->attached_array[i].bind_info;
1469 length = 256;
1470
1471 if (!video_device)
1472 continue;
1473
1474 if (!video_device->cap._DDC)
1475 continue;
1476
1477 if (type) {
1478 switch (type) {
1479 case ACPI_VIDEO_DISPLAY_CRT:
1480 if (!video_device->flags.crt)
1481 continue;
1482 break;
1483 case ACPI_VIDEO_DISPLAY_TV:
1484 if (!video_device->flags.tvout)
1485 continue;
1486 break;
1487 case ACPI_VIDEO_DISPLAY_DVI:
1488 if (!video_device->flags.dvi)
1489 continue;
1490 break;
1491 case ACPI_VIDEO_DISPLAY_LCD:
1492 if (!video_device->flags.lcd)
1493 continue;
1494 break;
1495 }
1496 } else if (video_device->device_id != device_id) {
1497 continue;
1498 }
1499
1500 status = acpi_video_device_EDID(video_device, &buffer, length);
1501
1502 if (ACPI_FAILURE(status) || !buffer ||
1503 buffer->type != ACPI_TYPE_BUFFER) {
1504 length = 128;
1505 status = acpi_video_device_EDID(video_device, &buffer,
1506 length);
1507 if (ACPI_FAILURE(status) || !buffer ||
1508 buffer->type != ACPI_TYPE_BUFFER) {
1509 continue;
1510 }
1511 }
1512
1513 *edid = buffer->buffer.pointer;
1514 return length;
1515 }
1516
1517 return -ENODEV;
1518 }
1519 EXPORT_SYMBOL(acpi_video_get_edid);
1520
1521 static int
acpi_video_bus_get_devices(struct acpi_video_bus * video,struct acpi_device * device)1522 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1523 struct acpi_device *device)
1524 {
1525 int status = 0;
1526 struct acpi_device *dev;
1527
1528 /*
1529 * There are systems where video module known to work fine regardless
1530 * of broken _DOD and ignoring returned value here doesn't cause
1531 * any issues later.
1532 */
1533 acpi_video_device_enumerate(video);
1534
1535 list_for_each_entry(dev, &device->children, node) {
1536
1537 status = acpi_video_bus_get_one_device(dev, video);
1538 if (status) {
1539 dev_err(&dev->dev, "Can't attach device\n");
1540 break;
1541 }
1542 video->child_count++;
1543 }
1544 return status;
1545 }
1546
1547 /* acpi_video interface */
1548
1549 /*
1550 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1551 * preform any automatic brightness change on receiving a notification.
1552 */
acpi_video_bus_start_devices(struct acpi_video_bus * video)1553 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1554 {
1555 return acpi_video_bus_DOS(video, 0,
1556 acpi_osi_is_win8() ? 1 : 0);
1557 }
1558
acpi_video_bus_stop_devices(struct acpi_video_bus * video)1559 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1560 {
1561 return acpi_video_bus_DOS(video, 0,
1562 acpi_osi_is_win8() ? 0 : 1);
1563 }
1564
acpi_video_bus_notify(struct acpi_device * device,u32 event)1565 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1566 {
1567 struct acpi_video_bus *video = acpi_driver_data(device);
1568 struct input_dev *input;
1569 int keycode = 0;
1570
1571 if (!video || !video->input)
1572 return;
1573
1574 input = video->input;
1575
1576 switch (event) {
1577 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1578 * most likely via hotkey. */
1579 keycode = KEY_SWITCHVIDEOMODE;
1580 break;
1581
1582 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1583 * connector. */
1584 acpi_video_device_enumerate(video);
1585 acpi_video_device_rebind(video);
1586 keycode = KEY_SWITCHVIDEOMODE;
1587 break;
1588
1589 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1590 keycode = KEY_SWITCHVIDEOMODE;
1591 break;
1592 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1593 keycode = KEY_VIDEO_NEXT;
1594 break;
1595 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1596 keycode = KEY_VIDEO_PREV;
1597 break;
1598
1599 default:
1600 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1601 "Unsupported event [0x%x]\n", event));
1602 break;
1603 }
1604
1605 if (acpi_notifier_call_chain(device, event, 0))
1606 /* Something vetoed the keypress. */
1607 keycode = 0;
1608
1609 if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) {
1610 input_report_key(input, keycode, 1);
1611 input_sync(input);
1612 input_report_key(input, keycode, 0);
1613 input_sync(input);
1614 }
1615
1616 return;
1617 }
1618
brightness_switch_event(struct acpi_video_device * video_device,u32 event)1619 static void brightness_switch_event(struct acpi_video_device *video_device,
1620 u32 event)
1621 {
1622 if (!brightness_switch_enabled)
1623 return;
1624
1625 video_device->switch_brightness_event = event;
1626 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1627 }
1628
acpi_video_device_notify(acpi_handle handle,u32 event,void * data)1629 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1630 {
1631 struct acpi_video_device *video_device = data;
1632 struct acpi_device *device = NULL;
1633 struct acpi_video_bus *bus;
1634 struct input_dev *input;
1635 int keycode = 0;
1636
1637 if (!video_device)
1638 return;
1639
1640 device = video_device->dev;
1641 bus = video_device->video;
1642 input = bus->input;
1643
1644 if (hw_changes_brightness > 0) {
1645 if (video_device->backlight)
1646 backlight_force_update(video_device->backlight,
1647 BACKLIGHT_UPDATE_HOTKEY);
1648 acpi_notifier_call_chain(device, event, 0);
1649 return;
1650 }
1651
1652 switch (event) {
1653 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1654 brightness_switch_event(video_device, event);
1655 keycode = KEY_BRIGHTNESS_CYCLE;
1656 break;
1657 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1658 brightness_switch_event(video_device, event);
1659 keycode = KEY_BRIGHTNESSUP;
1660 break;
1661 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1662 brightness_switch_event(video_device, event);
1663 keycode = KEY_BRIGHTNESSDOWN;
1664 break;
1665 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1666 brightness_switch_event(video_device, event);
1667 keycode = KEY_BRIGHTNESS_ZERO;
1668 break;
1669 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1670 brightness_switch_event(video_device, event);
1671 keycode = KEY_DISPLAY_OFF;
1672 break;
1673 default:
1674 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1675 "Unsupported event [0x%x]\n", event));
1676 break;
1677 }
1678
1679 acpi_notifier_call_chain(device, event, 0);
1680
1681 if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) {
1682 input_report_key(input, keycode, 1);
1683 input_sync(input);
1684 input_report_key(input, keycode, 0);
1685 input_sync(input);
1686 }
1687
1688 return;
1689 }
1690
acpi_video_resume(struct notifier_block * nb,unsigned long val,void * ign)1691 static int acpi_video_resume(struct notifier_block *nb,
1692 unsigned long val, void *ign)
1693 {
1694 struct acpi_video_bus *video;
1695 struct acpi_video_device *video_device;
1696 int i;
1697
1698 switch (val) {
1699 case PM_HIBERNATION_PREPARE:
1700 case PM_SUSPEND_PREPARE:
1701 case PM_RESTORE_PREPARE:
1702 return NOTIFY_DONE;
1703 }
1704
1705 video = container_of(nb, struct acpi_video_bus, pm_nb);
1706
1707 dev_info(&video->device->dev, "Restoring backlight state\n");
1708
1709 for (i = 0; i < video->attached_count; i++) {
1710 video_device = video->attached_array[i].bind_info;
1711 if (video_device && video_device->brightness)
1712 acpi_video_device_lcd_set_level(video_device,
1713 video_device->brightness->curr);
1714 }
1715
1716 return NOTIFY_OK;
1717 }
1718
1719 static acpi_status
acpi_video_bus_match(acpi_handle handle,u32 level,void * context,void ** return_value)1720 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1721 void **return_value)
1722 {
1723 struct acpi_device *device = context;
1724 struct acpi_device *sibling;
1725 int result;
1726
1727 if (handle == device->handle)
1728 return AE_CTRL_TERMINATE;
1729
1730 result = acpi_bus_get_device(handle, &sibling);
1731 if (result)
1732 return AE_OK;
1733
1734 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1735 return AE_ALREADY_EXISTS;
1736
1737 return AE_OK;
1738 }
1739
acpi_video_dev_register_backlight(struct acpi_video_device * device)1740 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1741 {
1742 struct backlight_properties props;
1743 struct pci_dev *pdev;
1744 acpi_handle acpi_parent;
1745 struct device *parent = NULL;
1746 int result;
1747 static int count;
1748 char *name;
1749
1750 result = acpi_video_init_brightness(device);
1751 if (result)
1752 return;
1753
1754 if (disable_backlight_sysfs_if > 0)
1755 return;
1756
1757 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1758 if (!name)
1759 return;
1760 count++;
1761
1762 acpi_get_parent(device->dev->handle, &acpi_parent);
1763
1764 pdev = acpi_get_pci_dev(acpi_parent);
1765 if (pdev) {
1766 parent = &pdev->dev;
1767 pci_dev_put(pdev);
1768 }
1769
1770 memset(&props, 0, sizeof(struct backlight_properties));
1771 props.type = BACKLIGHT_FIRMWARE;
1772 props.max_brightness =
1773 device->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1;
1774 device->backlight = backlight_device_register(name,
1775 parent,
1776 device,
1777 &acpi_backlight_ops,
1778 &props);
1779 kfree(name);
1780 if (IS_ERR(device->backlight)) {
1781 device->backlight = NULL;
1782 return;
1783 }
1784
1785 /*
1786 * Save current brightness level in case we have to restore it
1787 * before acpi_video_device_lcd_set_level() is called next time.
1788 */
1789 device->backlight->props.brightness =
1790 acpi_video_get_brightness(device->backlight);
1791
1792 device->cooling_dev = thermal_cooling_device_register("LCD",
1793 device->dev, &video_cooling_ops);
1794 if (IS_ERR(device->cooling_dev)) {
1795 /*
1796 * Set cooling_dev to NULL so we don't crash trying to free it.
1797 * Also, why the hell we are returning early and not attempt to
1798 * register video output if cooling device registration failed?
1799 * -- dtor
1800 */
1801 device->cooling_dev = NULL;
1802 return;
1803 }
1804
1805 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1806 device->cooling_dev->id);
1807 result = sysfs_create_link(&device->dev->dev.kobj,
1808 &device->cooling_dev->device.kobj,
1809 "thermal_cooling");
1810 if (result)
1811 printk(KERN_ERR PREFIX "Create sysfs link\n");
1812 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1813 &device->dev->dev.kobj, "device");
1814 if (result)
1815 printk(KERN_ERR PREFIX "Create sysfs link\n");
1816 }
1817
acpi_video_run_bcl_for_osi(struct acpi_video_bus * video)1818 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)
1819 {
1820 struct acpi_video_device *dev;
1821 union acpi_object *levels;
1822
1823 mutex_lock(&video->device_list_lock);
1824 list_for_each_entry(dev, &video->video_device_list, entry) {
1825 if (!acpi_video_device_lcd_query_levels(dev->dev->handle, &levels))
1826 kfree(levels);
1827 }
1828 mutex_unlock(&video->device_list_lock);
1829 }
1830
acpi_video_should_register_backlight(struct acpi_video_device * dev)1831 static bool acpi_video_should_register_backlight(struct acpi_video_device *dev)
1832 {
1833 /*
1834 * Do not create backlight device for video output
1835 * device that is not in the enumerated list.
1836 */
1837 if (!acpi_video_device_in_dod(dev)) {
1838 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n");
1839 return false;
1840 }
1841
1842 if (only_lcd)
1843 return dev->flags.lcd;
1844 return true;
1845 }
1846
acpi_video_bus_register_backlight(struct acpi_video_bus * video)1847 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1848 {
1849 struct acpi_video_device *dev;
1850
1851 if (video->backlight_registered)
1852 return 0;
1853
1854 acpi_video_run_bcl_for_osi(video);
1855
1856 if (acpi_video_get_backlight_type() != acpi_backlight_video)
1857 return 0;
1858
1859 mutex_lock(&video->device_list_lock);
1860 list_for_each_entry(dev, &video->video_device_list, entry) {
1861 if (acpi_video_should_register_backlight(dev))
1862 acpi_video_dev_register_backlight(dev);
1863 }
1864 mutex_unlock(&video->device_list_lock);
1865
1866 video->backlight_registered = true;
1867
1868 video->pm_nb.notifier_call = acpi_video_resume;
1869 video->pm_nb.priority = 0;
1870 return register_pm_notifier(&video->pm_nb);
1871 }
1872
acpi_video_dev_unregister_backlight(struct acpi_video_device * device)1873 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1874 {
1875 if (device->backlight) {
1876 backlight_device_unregister(device->backlight);
1877 device->backlight = NULL;
1878 }
1879 if (device->brightness) {
1880 kfree(device->brightness->levels);
1881 kfree(device->brightness);
1882 device->brightness = NULL;
1883 }
1884 if (device->cooling_dev) {
1885 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1886 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1887 thermal_cooling_device_unregister(device->cooling_dev);
1888 device->cooling_dev = NULL;
1889 }
1890 }
1891
acpi_video_bus_unregister_backlight(struct acpi_video_bus * video)1892 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1893 {
1894 struct acpi_video_device *dev;
1895 int error;
1896
1897 if (!video->backlight_registered)
1898 return 0;
1899
1900 error = unregister_pm_notifier(&video->pm_nb);
1901
1902 mutex_lock(&video->device_list_lock);
1903 list_for_each_entry(dev, &video->video_device_list, entry)
1904 acpi_video_dev_unregister_backlight(dev);
1905 mutex_unlock(&video->device_list_lock);
1906
1907 video->backlight_registered = false;
1908
1909 return error;
1910 }
1911
acpi_video_dev_add_notify_handler(struct acpi_video_device * device)1912 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1913 {
1914 acpi_status status;
1915 struct acpi_device *adev = device->dev;
1916
1917 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1918 acpi_video_device_notify, device);
1919 if (ACPI_FAILURE(status))
1920 dev_err(&adev->dev, "Error installing notify handler\n");
1921 else
1922 device->flags.notify = 1;
1923 }
1924
acpi_video_bus_add_notify_handler(struct acpi_video_bus * video)1925 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1926 {
1927 struct input_dev *input;
1928 struct acpi_video_device *dev;
1929 int error;
1930
1931 video->input = input = input_allocate_device();
1932 if (!input) {
1933 error = -ENOMEM;
1934 goto out;
1935 }
1936
1937 error = acpi_video_bus_start_devices(video);
1938 if (error)
1939 goto err_free_input;
1940
1941 snprintf(video->phys, sizeof(video->phys),
1942 "%s/video/input0", acpi_device_hid(video->device));
1943
1944 input->name = acpi_device_name(video->device);
1945 input->phys = video->phys;
1946 input->id.bustype = BUS_HOST;
1947 input->id.product = 0x06;
1948 input->dev.parent = &video->device->dev;
1949 input->evbit[0] = BIT(EV_KEY);
1950 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1951 set_bit(KEY_VIDEO_NEXT, input->keybit);
1952 set_bit(KEY_VIDEO_PREV, input->keybit);
1953 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1954 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1955 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1956 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1957 set_bit(KEY_DISPLAY_OFF, input->keybit);
1958
1959 error = input_register_device(input);
1960 if (error)
1961 goto err_stop_dev;
1962
1963 mutex_lock(&video->device_list_lock);
1964 list_for_each_entry(dev, &video->video_device_list, entry)
1965 acpi_video_dev_add_notify_handler(dev);
1966 mutex_unlock(&video->device_list_lock);
1967
1968 return 0;
1969
1970 err_stop_dev:
1971 acpi_video_bus_stop_devices(video);
1972 err_free_input:
1973 input_free_device(input);
1974 video->input = NULL;
1975 out:
1976 return error;
1977 }
1978
acpi_video_dev_remove_notify_handler(struct acpi_video_device * dev)1979 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1980 {
1981 if (dev->flags.notify) {
1982 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1983 acpi_video_device_notify);
1984 dev->flags.notify = 0;
1985 }
1986 }
1987
acpi_video_bus_remove_notify_handler(struct acpi_video_bus * video)1988 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1989 {
1990 struct acpi_video_device *dev;
1991
1992 mutex_lock(&video->device_list_lock);
1993 list_for_each_entry(dev, &video->video_device_list, entry)
1994 acpi_video_dev_remove_notify_handler(dev);
1995 mutex_unlock(&video->device_list_lock);
1996
1997 acpi_video_bus_stop_devices(video);
1998 input_unregister_device(video->input);
1999 video->input = NULL;
2000 }
2001
acpi_video_bus_put_devices(struct acpi_video_bus * video)2002 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2003 {
2004 struct acpi_video_device *dev, *next;
2005
2006 mutex_lock(&video->device_list_lock);
2007 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2008 list_del(&dev->entry);
2009 kfree(dev);
2010 }
2011 mutex_unlock(&video->device_list_lock);
2012
2013 return 0;
2014 }
2015
2016 static int instance;
2017
acpi_video_bus_add(struct acpi_device * device)2018 static int acpi_video_bus_add(struct acpi_device *device)
2019 {
2020 struct acpi_video_bus *video;
2021 int error;
2022 acpi_status status;
2023
2024 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
2025 device->parent->handle, 1,
2026 acpi_video_bus_match, NULL,
2027 device, NULL);
2028 if (status == AE_ALREADY_EXISTS) {
2029 printk(KERN_WARNING FW_BUG
2030 "Duplicate ACPI video bus devices for the"
2031 " same VGA controller, please try module "
2032 "parameter \"video.allow_duplicates=1\""
2033 "if the current driver doesn't work.\n");
2034 if (!allow_duplicates)
2035 return -ENODEV;
2036 }
2037
2038 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2039 if (!video)
2040 return -ENOMEM;
2041
2042 /* a hack to fix the duplicate name "VID" problem on T61 */
2043 if (!strcmp(device->pnp.bus_id, "VID")) {
2044 if (instance)
2045 device->pnp.bus_id[3] = '0' + instance;
2046 instance++;
2047 }
2048 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2049 if (!strcmp(device->pnp.bus_id, "VGA")) {
2050 if (instance)
2051 device->pnp.bus_id[3] = '0' + instance;
2052 instance++;
2053 }
2054
2055 video->device = device;
2056 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2057 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2058 device->driver_data = video;
2059
2060 acpi_video_bus_find_cap(video);
2061 error = acpi_video_bus_check(video);
2062 if (error)
2063 goto err_free_video;
2064
2065 mutex_init(&video->device_list_lock);
2066 INIT_LIST_HEAD(&video->video_device_list);
2067
2068 error = acpi_video_bus_get_devices(video, device);
2069 if (error)
2070 goto err_put_video;
2071
2072 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
2073 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2074 video->flags.multihead ? "yes" : "no",
2075 video->flags.rom ? "yes" : "no",
2076 video->flags.post ? "yes" : "no");
2077 mutex_lock(&video_list_lock);
2078 list_add_tail(&video->entry, &video_bus_head);
2079 mutex_unlock(&video_list_lock);
2080
2081 acpi_video_bus_register_backlight(video);
2082 acpi_video_bus_add_notify_handler(video);
2083
2084 return 0;
2085
2086 err_put_video:
2087 acpi_video_bus_put_devices(video);
2088 kfree(video->attached_array);
2089 err_free_video:
2090 kfree(video);
2091 device->driver_data = NULL;
2092
2093 return error;
2094 }
2095
acpi_video_bus_remove(struct acpi_device * device)2096 static int acpi_video_bus_remove(struct acpi_device *device)
2097 {
2098 struct acpi_video_bus *video = NULL;
2099
2100
2101 if (!device || !acpi_driver_data(device))
2102 return -EINVAL;
2103
2104 video = acpi_driver_data(device);
2105
2106 acpi_video_bus_remove_notify_handler(video);
2107 acpi_video_bus_unregister_backlight(video);
2108 acpi_video_bus_put_devices(video);
2109
2110 mutex_lock(&video_list_lock);
2111 list_del(&video->entry);
2112 mutex_unlock(&video_list_lock);
2113
2114 kfree(video->attached_array);
2115 kfree(video);
2116
2117 return 0;
2118 }
2119
is_i740(struct pci_dev * dev)2120 static int __init is_i740(struct pci_dev *dev)
2121 {
2122 if (dev->device == 0x00D1)
2123 return 1;
2124 if (dev->device == 0x7000)
2125 return 1;
2126 return 0;
2127 }
2128
intel_opregion_present(void)2129 static int __init intel_opregion_present(void)
2130 {
2131 int opregion = 0;
2132 struct pci_dev *dev = NULL;
2133 u32 address;
2134
2135 for_each_pci_dev(dev) {
2136 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2137 continue;
2138 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2139 continue;
2140 /* We don't want to poke around undefined i740 registers */
2141 if (is_i740(dev))
2142 continue;
2143 pci_read_config_dword(dev, 0xfc, &address);
2144 if (!address)
2145 continue;
2146 opregion = 1;
2147 }
2148 return opregion;
2149 }
2150
2151 /* Check if the chassis-type indicates there is no builtin LCD panel */
dmi_is_desktop(void)2152 static bool dmi_is_desktop(void)
2153 {
2154 const char *chassis_type;
2155 unsigned long type;
2156
2157 chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE);
2158 if (!chassis_type)
2159 return false;
2160
2161 if (kstrtoul(chassis_type, 10, &type) != 0)
2162 return false;
2163
2164 switch (type) {
2165 case 0x03: /* Desktop */
2166 case 0x04: /* Low Profile Desktop */
2167 case 0x05: /* Pizza Box */
2168 case 0x06: /* Mini Tower */
2169 case 0x07: /* Tower */
2170 case 0x10: /* Lunch Box */
2171 case 0x11: /* Main Server Chassis */
2172 return true;
2173 }
2174
2175 return false;
2176 }
2177
acpi_video_register(void)2178 int acpi_video_register(void)
2179 {
2180 int ret = 0;
2181
2182 mutex_lock(®ister_count_mutex);
2183 if (register_count) {
2184 /*
2185 * if the function of acpi_video_register is already called,
2186 * don't register the acpi_vide_bus again and return no error.
2187 */
2188 goto leave;
2189 }
2190
2191 /*
2192 * We're seeing a lot of bogus backlight interfaces on newer machines
2193 * without a LCD such as desktops, servers and HDMI sticks. Checking
2194 * the lcd flag fixes this, so enable this on any machines which are
2195 * win8 ready (where we also prefer the native backlight driver, so
2196 * normally the acpi_video code should not register there anyways).
2197 */
2198 if (only_lcd == -1) {
2199 if (dmi_is_desktop() && acpi_osi_is_win8())
2200 only_lcd = true;
2201 else
2202 only_lcd = false;
2203 }
2204
2205 dmi_check_system(video_dmi_table);
2206
2207 ret = acpi_bus_register_driver(&acpi_video_bus);
2208 if (ret)
2209 goto leave;
2210
2211 /*
2212 * When the acpi_video_bus is loaded successfully, increase
2213 * the counter reference.
2214 */
2215 register_count = 1;
2216
2217 leave:
2218 mutex_unlock(®ister_count_mutex);
2219 return ret;
2220 }
2221 EXPORT_SYMBOL(acpi_video_register);
2222
acpi_video_unregister(void)2223 void acpi_video_unregister(void)
2224 {
2225 mutex_lock(®ister_count_mutex);
2226 if (register_count) {
2227 acpi_bus_unregister_driver(&acpi_video_bus);
2228 register_count = 0;
2229 }
2230 mutex_unlock(®ister_count_mutex);
2231 }
2232 EXPORT_SYMBOL(acpi_video_unregister);
2233
acpi_video_unregister_backlight(void)2234 void acpi_video_unregister_backlight(void)
2235 {
2236 struct acpi_video_bus *video;
2237
2238 mutex_lock(®ister_count_mutex);
2239 if (register_count) {
2240 mutex_lock(&video_list_lock);
2241 list_for_each_entry(video, &video_bus_head, entry)
2242 acpi_video_bus_unregister_backlight(video);
2243 mutex_unlock(&video_list_lock);
2244 }
2245 mutex_unlock(®ister_count_mutex);
2246 }
2247
acpi_video_handles_brightness_key_presses(void)2248 bool acpi_video_handles_brightness_key_presses(void)
2249 {
2250 bool have_video_busses;
2251
2252 mutex_lock(&video_list_lock);
2253 have_video_busses = !list_empty(&video_bus_head);
2254 mutex_unlock(&video_list_lock);
2255
2256 return have_video_busses &&
2257 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS);
2258 }
2259 EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses);
2260
2261 /*
2262 * This is kind of nasty. Hardware using Intel chipsets may require
2263 * the video opregion code to be run first in order to initialise
2264 * state before any ACPI video calls are made. To handle this we defer
2265 * registration of the video class until the opregion code has run.
2266 */
2267
acpi_video_init(void)2268 static int __init acpi_video_init(void)
2269 {
2270 /*
2271 * Let the module load even if ACPI is disabled (e.g. due to
2272 * a broken BIOS) so that i915.ko can still be loaded on such
2273 * old systems without an AcpiOpRegion.
2274 *
2275 * acpi_video_register() will report -ENODEV later as well due
2276 * to acpi_disabled when i915.ko tries to register itself afterwards.
2277 */
2278 if (acpi_disabled)
2279 return 0;
2280
2281 if (intel_opregion_present())
2282 return 0;
2283
2284 return acpi_video_register();
2285 }
2286
acpi_video_exit(void)2287 static void __exit acpi_video_exit(void)
2288 {
2289 acpi_video_detect_exit();
2290 acpi_video_unregister();
2291
2292 return;
2293 }
2294
2295 module_init(acpi_video_init);
2296 module_exit(acpi_video_exit);
2297
