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ACPI / video: driver must be registered before checking for keypresses
[deliverable/linux.git] / drivers / acpi / acpi_video.c
1 /*
2 * video.c - ACPI Video Driver
3 *
4 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
5 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
6 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
7 *
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
21 */
22
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <linux/types.h>
27 #include <linux/list.h>
28 #include <linux/mutex.h>
29 #include <linux/input.h>
30 #include <linux/backlight.h>
31 #include <linux/thermal.h>
32 #include <linux/sort.h>
33 #include <linux/pci.h>
34 #include <linux/pci_ids.h>
35 #include <linux/slab.h>
36 #include <linux/dmi.h>
37 #include <linux/suspend.h>
38 #include <linux/acpi.h>
39 #include <acpi/video.h>
40 #include <asm/uaccess.h>
41
42 #define PREFIX "ACPI: "
43
44 #define ACPI_VIDEO_BUS_NAME "Video Bus"
45 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
46 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
47 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
48 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
49 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
50 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
51
52 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
53 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
54 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
55 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
56 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
57
58 #define MAX_NAME_LEN 20
59
60 #define _COMPONENT ACPI_VIDEO_COMPONENT
61 ACPI_MODULE_NAME("video");
62
63 MODULE_AUTHOR("Bruno Ducrot");
64 MODULE_DESCRIPTION("ACPI Video Driver");
65 MODULE_LICENSE("GPL");
66
67 static bool brightness_switch_enabled = 1;
68 module_param(brightness_switch_enabled, bool, 0644);
69
70 /*
71 * By default, we don't allow duplicate ACPI video bus devices
72 * under the same VGA controller
73 */
74 static bool allow_duplicates;
75 module_param(allow_duplicates, bool, 0644);
76
77 static int disable_backlight_sysfs_if = -1;
78 module_param(disable_backlight_sysfs_if, int, 0444);
79
80 #define REPORT_OUTPUT_KEY_EVENTS 0x01
81 #define REPORT_BRIGHTNESS_KEY_EVENTS 0x02
82 static int report_key_events = -1;
83 module_param(report_key_events, int, 0644);
84 MODULE_PARM_DESC(report_key_events,
85 "0: none, 1: output changes, 2: brightness changes, 3: all");
86
87 static bool device_id_scheme = false;
88 module_param(device_id_scheme, bool, 0444);
89
90 static bool only_lcd = false;
91 module_param(only_lcd, bool, 0444);
92
93 static DECLARE_COMPLETION(register_done);
94 static DEFINE_MUTEX(register_done_mutex);
95 static struct mutex video_list_lock;
96 static struct list_head video_bus_head;
97 static int acpi_video_bus_add(struct acpi_device *device);
98 static int acpi_video_bus_remove(struct acpi_device *device);
99 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
100 void acpi_video_detect_exit(void);
101
102 static const struct acpi_device_id video_device_ids[] = {
103 {ACPI_VIDEO_HID, 0},
104 {"", 0},
105 };
106 MODULE_DEVICE_TABLE(acpi, video_device_ids);
107
108 static struct acpi_driver acpi_video_bus = {
109 .name = "video",
110 .class = ACPI_VIDEO_CLASS,
111 .ids = video_device_ids,
112 .ops = {
113 .add = acpi_video_bus_add,
114 .remove = acpi_video_bus_remove,
115 .notify = acpi_video_bus_notify,
116 },
117 };
118
119 struct acpi_video_bus_flags {
120 u8 multihead:1; /* can switch video heads */
121 u8 rom:1; /* can retrieve a video rom */
122 u8 post:1; /* can configure the head to */
123 u8 reserved:5;
124 };
125
126 struct acpi_video_bus_cap {
127 u8 _DOS:1; /* Enable/Disable output switching */
128 u8 _DOD:1; /* Enumerate all devices attached to display adapter */
129 u8 _ROM:1; /* Get ROM Data */
130 u8 _GPD:1; /* Get POST Device */
131 u8 _SPD:1; /* Set POST Device */
132 u8 _VPO:1; /* Video POST Options */
133 u8 reserved:2;
134 };
135
136 struct acpi_video_device_attrib {
137 u32 display_index:4; /* A zero-based instance of the Display */
138 u32 display_port_attachment:4; /* This field differentiates the display type */
139 u32 display_type:4; /* Describe the specific type in use */
140 u32 vendor_specific:4; /* Chipset Vendor Specific */
141 u32 bios_can_detect:1; /* BIOS can detect the device */
142 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
143 the VGA device. */
144 u32 pipe_id:3; /* For VGA multiple-head devices. */
145 u32 reserved:10; /* Must be 0 */
146 u32 device_id_scheme:1; /* Device ID Scheme */
147 };
148
149 struct acpi_video_enumerated_device {
150 union {
151 u32 int_val;
152 struct acpi_video_device_attrib attrib;
153 } value;
154 struct acpi_video_device *bind_info;
155 };
156
157 struct acpi_video_bus {
158 struct acpi_device *device;
159 bool backlight_registered;
160 u8 dos_setting;
161 struct acpi_video_enumerated_device *attached_array;
162 u8 attached_count;
163 u8 child_count;
164 struct acpi_video_bus_cap cap;
165 struct acpi_video_bus_flags flags;
166 struct list_head video_device_list;
167 struct mutex device_list_lock; /* protects video_device_list */
168 struct list_head entry;
169 struct input_dev *input;
170 char phys[32]; /* for input device */
171 struct notifier_block pm_nb;
172 };
173
174 struct acpi_video_device_flags {
175 u8 crt:1;
176 u8 lcd:1;
177 u8 tvout:1;
178 u8 dvi:1;
179 u8 bios:1;
180 u8 unknown:1;
181 u8 notify:1;
182 u8 reserved:1;
183 };
184
185 struct acpi_video_device_cap {
186 u8 _ADR:1; /* Return the unique ID */
187 u8 _BCL:1; /* Query list of brightness control levels supported */
188 u8 _BCM:1; /* Set the brightness level */
189 u8 _BQC:1; /* Get current brightness level */
190 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
191 u8 _DDC:1; /* Return the EDID for this device */
192 };
193
194 struct acpi_video_brightness_flags {
195 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
196 u8 _BCL_reversed:1; /* _BCL package is in a reversed order */
197 u8 _BQC_use_index:1; /* _BQC returns an index value */
198 };
199
200 struct acpi_video_device_brightness {
201 int curr;
202 int count;
203 int *levels;
204 struct acpi_video_brightness_flags flags;
205 };
206
207 struct acpi_video_device {
208 unsigned long device_id;
209 struct acpi_video_device_flags flags;
210 struct acpi_video_device_cap cap;
211 struct list_head entry;
212 struct delayed_work switch_brightness_work;
213 int switch_brightness_event;
214 struct acpi_video_bus *video;
215 struct acpi_device *dev;
216 struct acpi_video_device_brightness *brightness;
217 struct backlight_device *backlight;
218 struct thermal_cooling_device *cooling_dev;
219 };
220
221 static const char device_decode[][30] = {
222 "motherboard VGA device",
223 "PCI VGA device",
224 "AGP VGA device",
225 "UNKNOWN",
226 };
227
228 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
229 static void acpi_video_device_rebind(struct acpi_video_bus *video);
230 static void acpi_video_device_bind(struct acpi_video_bus *video,
231 struct acpi_video_device *device);
232 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
233 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
234 int level);
235 static int acpi_video_device_lcd_get_level_current(
236 struct acpi_video_device *device,
237 unsigned long long *level, bool raw);
238 static int acpi_video_get_next_level(struct acpi_video_device *device,
239 u32 level_current, u32 event);
240 static void acpi_video_switch_brightness(struct work_struct *work);
241
242 /* backlight device sysfs support */
243 static int acpi_video_get_brightness(struct backlight_device *bd)
244 {
245 unsigned long long cur_level;
246 int i;
247 struct acpi_video_device *vd = bl_get_data(bd);
248
249 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
250 return -EINVAL;
251 for (i = 2; i < vd->brightness->count; i++) {
252 if (vd->brightness->levels[i] == cur_level)
253 /*
254 * The first two entries are special - see page 575
255 * of the ACPI spec 3.0
256 */
257 return i - 2;
258 }
259 return 0;
260 }
261
262 static int acpi_video_set_brightness(struct backlight_device *bd)
263 {
264 int request_level = bd->props.brightness + 2;
265 struct acpi_video_device *vd = bl_get_data(bd);
266
267 cancel_delayed_work(&vd->switch_brightness_work);
268 return acpi_video_device_lcd_set_level(vd,
269 vd->brightness->levels[request_level]);
270 }
271
272 static const struct backlight_ops acpi_backlight_ops = {
273 .get_brightness = acpi_video_get_brightness,
274 .update_status = acpi_video_set_brightness,
275 };
276
277 /* thermal cooling device callbacks */
278 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
279 long *state)
280 {
281 struct acpi_device *device = cooling_dev->devdata;
282 struct acpi_video_device *video = acpi_driver_data(device);
283
284 *state = video->brightness->count - 3;
285 return 0;
286 }
287
288 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
289 long *state)
290 {
291 struct acpi_device *device = cooling_dev->devdata;
292 struct acpi_video_device *video = acpi_driver_data(device);
293 unsigned long long level;
294 int offset;
295
296 if (acpi_video_device_lcd_get_level_current(video, &level, false))
297 return -EINVAL;
298 for (offset = 2; offset < video->brightness->count; offset++)
299 if (level == video->brightness->levels[offset]) {
300 *state = video->brightness->count - offset - 1;
301 return 0;
302 }
303
304 return -EINVAL;
305 }
306
307 static int
308 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
309 {
310 struct acpi_device *device = cooling_dev->devdata;
311 struct acpi_video_device *video = acpi_driver_data(device);
312 int level;
313
314 if (state >= video->brightness->count - 2)
315 return -EINVAL;
316
317 state = video->brightness->count - state;
318 level = video->brightness->levels[state - 1];
319 return acpi_video_device_lcd_set_level(video, level);
320 }
321
322 static const struct thermal_cooling_device_ops video_cooling_ops = {
323 .get_max_state = video_get_max_state,
324 .get_cur_state = video_get_cur_state,
325 .set_cur_state = video_set_cur_state,
326 };
327
328 /*
329 * --------------------------------------------------------------------------
330 * Video Management
331 * --------------------------------------------------------------------------
332 */
333
334 static int
335 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
336 union acpi_object **levels)
337 {
338 int status;
339 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
340 union acpi_object *obj;
341
342
343 *levels = NULL;
344
345 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
346 if (!ACPI_SUCCESS(status))
347 return status;
348 obj = (union acpi_object *)buffer.pointer;
349 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
350 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
351 status = -EFAULT;
352 goto err;
353 }
354
355 *levels = obj;
356
357 return 0;
358
359 err:
360 kfree(buffer.pointer);
361
362 return status;
363 }
364
365 static int
366 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
367 {
368 int status;
369 int state;
370
371 status = acpi_execute_simple_method(device->dev->handle,
372 "_BCM", level);
373 if (ACPI_FAILURE(status)) {
374 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
375 return -EIO;
376 }
377
378 device->brightness->curr = level;
379 for (state = 2; state < device->brightness->count; state++)
380 if (level == device->brightness->levels[state]) {
381 if (device->backlight)
382 device->backlight->props.brightness = state - 2;
383 return 0;
384 }
385
386 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
387 return -EINVAL;
388 }
389
390 /*
391 * For some buggy _BQC methods, we need to add a constant value to
392 * the _BQC return value to get the actual current brightness level
393 */
394
395 static int bqc_offset_aml_bug_workaround;
396 static int video_set_bqc_offset(const struct dmi_system_id *d)
397 {
398 bqc_offset_aml_bug_workaround = 9;
399 return 0;
400 }
401
402 static int video_disable_backlight_sysfs_if(
403 const struct dmi_system_id *d)
404 {
405 if (disable_backlight_sysfs_if == -1)
406 disable_backlight_sysfs_if = 1;
407 return 0;
408 }
409
410 static int video_set_device_id_scheme(const struct dmi_system_id *d)
411 {
412 device_id_scheme = true;
413 return 0;
414 }
415
416 static int video_enable_only_lcd(const struct dmi_system_id *d)
417 {
418 only_lcd = true;
419 return 0;
420 }
421
422 static int video_set_report_key_events(const struct dmi_system_id *id)
423 {
424 if (report_key_events == -1)
425 report_key_events = (uintptr_t)id->driver_data;
426 return 0;
427 }
428
429 static struct dmi_system_id video_dmi_table[] = {
430 /*
431 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
432 */
433 {
434 .callback = video_set_bqc_offset,
435 .ident = "Acer Aspire 5720",
436 .matches = {
437 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
438 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
439 },
440 },
441 {
442 .callback = video_set_bqc_offset,
443 .ident = "Acer Aspire 5710Z",
444 .matches = {
445 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
446 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
447 },
448 },
449 {
450 .callback = video_set_bqc_offset,
451 .ident = "eMachines E510",
452 .matches = {
453 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
454 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
455 },
456 },
457 {
458 .callback = video_set_bqc_offset,
459 .ident = "Acer Aspire 5315",
460 .matches = {
461 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
462 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
463 },
464 },
465 {
466 .callback = video_set_bqc_offset,
467 .ident = "Acer Aspire 7720",
468 .matches = {
469 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
470 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
471 },
472 },
473
474 /*
475 * Some machines have a broken acpi-video interface for brightness
476 * control, but still need an acpi_video_device_lcd_set_level() call
477 * on resume to turn the backlight power on. We Enable backlight
478 * control on these systems, but do not register a backlight sysfs
479 * as brightness control does not work.
480 */
481 {
482 /* https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
483 .callback = video_disable_backlight_sysfs_if,
484 .ident = "Toshiba Portege R830",
485 .matches = {
486 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
487 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R830"),
488 },
489 },
490 /*
491 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set
492 * but the IDs actually follow the Device ID Scheme.
493 */
494 {
495 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
496 .callback = video_set_device_id_scheme,
497 .ident = "ESPRIMO Mobile M9410",
498 .matches = {
499 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
500 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
501 },
502 },
503 /*
504 * Some machines have multiple video output devices, but only the one
505 * that is the type of LCD can do the backlight control so we should not
506 * register backlight interface for other video output devices.
507 */
508 {
509 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
510 .callback = video_enable_only_lcd,
511 .ident = "ESPRIMO Mobile M9410",
512 .matches = {
513 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
514 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
515 },
516 },
517 /*
518 * Some machines report wrong key events on the acpi-bus, suppress
519 * key event reporting on these. Note this is only intended to work
520 * around events which are plain wrong. In some cases we get double
521 * events, in this case acpi-video is considered the canonical source
522 * and the events from the other source should be filtered. E.g.
523 * by calling acpi_video_handles_brightness_key_presses() from the
524 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb
525 */
526 {
527 .callback = video_set_report_key_events,
528 .driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS),
529 .ident = "Dell Vostro V131",
530 .matches = {
531 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
532 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
533 },
534 },
535 {}
536 };
537
538 static unsigned long long
539 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
540 unsigned long long bqc_value)
541 {
542 unsigned long long level;
543
544 if (device->brightness->flags._BQC_use_index) {
545 /*
546 * _BQC returns an index that doesn't account for
547 * the first 2 items with special meaning, so we need
548 * to compensate for that by offsetting ourselves
549 */
550 if (device->brightness->flags._BCL_reversed)
551 bqc_value = device->brightness->count - 3 - bqc_value;
552
553 level = device->brightness->levels[bqc_value + 2];
554 } else {
555 level = bqc_value;
556 }
557
558 level += bqc_offset_aml_bug_workaround;
559
560 return level;
561 }
562
563 static int
564 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
565 unsigned long long *level, bool raw)
566 {
567 acpi_status status = AE_OK;
568 int i;
569
570 if (device->cap._BQC || device->cap._BCQ) {
571 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
572
573 status = acpi_evaluate_integer(device->dev->handle, buf,
574 NULL, level);
575 if (ACPI_SUCCESS(status)) {
576 if (raw) {
577 /*
578 * Caller has indicated he wants the raw
579 * value returned by _BQC, so don't furtherly
580 * mess with the value.
581 */
582 return 0;
583 }
584
585 *level = acpi_video_bqc_value_to_level(device, *level);
586
587 for (i = 2; i < device->brightness->count; i++)
588 if (device->brightness->levels[i] == *level) {
589 device->brightness->curr = *level;
590 return 0;
591 }
592 /*
593 * BQC returned an invalid level.
594 * Stop using it.
595 */
596 ACPI_WARNING((AE_INFO,
597 "%s returned an invalid level",
598 buf));
599 device->cap._BQC = device->cap._BCQ = 0;
600 } else {
601 /*
602 * Fixme:
603 * should we return an error or ignore this failure?
604 * dev->brightness->curr is a cached value which stores
605 * the correct current backlight level in most cases.
606 * ACPI video backlight still works w/ buggy _BQC.
607 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
608 */
609 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
610 device->cap._BQC = device->cap._BCQ = 0;
611 }
612 }
613
614 *level = device->brightness->curr;
615 return 0;
616 }
617
618 static int
619 acpi_video_device_EDID(struct acpi_video_device *device,
620 union acpi_object **edid, ssize_t length)
621 {
622 int status;
623 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
624 union acpi_object *obj;
625 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
626 struct acpi_object_list args = { 1, &arg0 };
627
628
629 *edid = NULL;
630
631 if (!device)
632 return -ENODEV;
633 if (length == 128)
634 arg0.integer.value = 1;
635 else if (length == 256)
636 arg0.integer.value = 2;
637 else
638 return -EINVAL;
639
640 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
641 if (ACPI_FAILURE(status))
642 return -ENODEV;
643
644 obj = buffer.pointer;
645
646 if (obj && obj->type == ACPI_TYPE_BUFFER)
647 *edid = obj;
648 else {
649 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
650 status = -EFAULT;
651 kfree(obj);
652 }
653
654 return status;
655 }
656
657 /* bus */
658
659 /*
660 * Arg:
661 * video : video bus device pointer
662 * bios_flag :
663 * 0. The system BIOS should NOT automatically switch(toggle)
664 * the active display output.
665 * 1. The system BIOS should automatically switch (toggle) the
666 * active display output. No switch event.
667 * 2. The _DGS value should be locked.
668 * 3. The system BIOS should not automatically switch (toggle) the
669 * active display output, but instead generate the display switch
670 * event notify code.
671 * lcd_flag :
672 * 0. The system BIOS should automatically control the brightness level
673 * of the LCD when the power changes from AC to DC
674 * 1. The system BIOS should NOT automatically control the brightness
675 * level of the LCD when the power changes from AC to DC.
676 * Return Value:
677 * -EINVAL wrong arg.
678 */
679
680 static int
681 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
682 {
683 acpi_status status;
684
685 if (!video->cap._DOS)
686 return 0;
687
688 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
689 return -EINVAL;
690 video->dos_setting = (lcd_flag << 2) | bios_flag;
691 status = acpi_execute_simple_method(video->device->handle, "_DOS",
692 (lcd_flag << 2) | bios_flag);
693 if (ACPI_FAILURE(status))
694 return -EIO;
695
696 return 0;
697 }
698
699 /*
700 * Simple comparison function used to sort backlight levels.
701 */
702
703 static int
704 acpi_video_cmp_level(const void *a, const void *b)
705 {
706 return *(int *)a - *(int *)b;
707 }
708
709 /*
710 * Decides if _BQC/_BCQ for this system is usable
711 *
712 * We do this by changing the level first and then read out the current
713 * brightness level, if the value does not match, find out if it is using
714 * index. If not, clear the _BQC/_BCQ capability.
715 */
716 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
717 int max_level, int current_level)
718 {
719 struct acpi_video_device_brightness *br = device->brightness;
720 int result;
721 unsigned long long level;
722 int test_level;
723
724 /* don't mess with existing known broken systems */
725 if (bqc_offset_aml_bug_workaround)
726 return 0;
727
728 /*
729 * Some systems always report current brightness level as maximum
730 * through _BQC, we need to test another value for them.
731 */
732 test_level = current_level == max_level ? br->levels[3] : max_level;
733
734 result = acpi_video_device_lcd_set_level(device, test_level);
735 if (result)
736 return result;
737
738 result = acpi_video_device_lcd_get_level_current(device, &level, true);
739 if (result)
740 return result;
741
742 if (level != test_level) {
743 /* buggy _BQC found, need to find out if it uses index */
744 if (level < br->count) {
745 if (br->flags._BCL_reversed)
746 level = br->count - 3 - level;
747 if (br->levels[level + 2] == test_level)
748 br->flags._BQC_use_index = 1;
749 }
750
751 if (!br->flags._BQC_use_index)
752 device->cap._BQC = device->cap._BCQ = 0;
753 }
754
755 return 0;
756 }
757
758
759 /*
760 * Arg:
761 * device : video output device (LCD, CRT, ..)
762 *
763 * Return Value:
764 * Maximum brightness level
765 *
766 * Allocate and initialize device->brightness.
767 */
768
769 static int
770 acpi_video_init_brightness(struct acpi_video_device *device)
771 {
772 union acpi_object *obj = NULL;
773 int i, max_level = 0, count = 0, level_ac_battery = 0;
774 unsigned long long level, level_old;
775 union acpi_object *o;
776 struct acpi_video_device_brightness *br = NULL;
777 int result = -EINVAL;
778 u32 value;
779
780 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
781 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
782 "LCD brightness level\n"));
783 goto out;
784 }
785
786 if (obj->package.count < 2)
787 goto out;
788
789 br = kzalloc(sizeof(*br), GFP_KERNEL);
790 if (!br) {
791 printk(KERN_ERR "can't allocate memory\n");
792 result = -ENOMEM;
793 goto out;
794 }
795
796 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
797 GFP_KERNEL);
798 if (!br->levels) {
799 result = -ENOMEM;
800 goto out_free;
801 }
802
803 for (i = 0; i < obj->package.count; i++) {
804 o = (union acpi_object *)&obj->package.elements[i];
805 if (o->type != ACPI_TYPE_INTEGER) {
806 printk(KERN_ERR PREFIX "Invalid data\n");
807 continue;
808 }
809 value = (u32) o->integer.value;
810 /* Skip duplicate entries */
811 if (count > 2 && br->levels[count - 1] == value)
812 continue;
813
814 br->levels[count] = value;
815
816 if (br->levels[count] > max_level)
817 max_level = br->levels[count];
818 count++;
819 }
820
821 /*
822 * some buggy BIOS don't export the levels
823 * when machine is on AC/Battery in _BCL package.
824 * In this case, the first two elements in _BCL packages
825 * are also supported brightness levels that OS should take care of.
826 */
827 for (i = 2; i < count; i++) {
828 if (br->levels[i] == br->levels[0])
829 level_ac_battery++;
830 if (br->levels[i] == br->levels[1])
831 level_ac_battery++;
832 }
833
834 if (level_ac_battery < 2) {
835 level_ac_battery = 2 - level_ac_battery;
836 br->flags._BCL_no_ac_battery_levels = 1;
837 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
838 br->levels[i] = br->levels[i - level_ac_battery];
839 count += level_ac_battery;
840 } else if (level_ac_battery > 2)
841 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
842
843 /* Check if the _BCL package is in a reversed order */
844 if (max_level == br->levels[2]) {
845 br->flags._BCL_reversed = 1;
846 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
847 acpi_video_cmp_level, NULL);
848 } else if (max_level != br->levels[count - 1])
849 ACPI_ERROR((AE_INFO,
850 "Found unordered _BCL package"));
851
852 br->count = count;
853 device->brightness = br;
854
855 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
856 br->curr = level = max_level;
857
858 if (!device->cap._BQC)
859 goto set_level;
860
861 result = acpi_video_device_lcd_get_level_current(device,
862 &level_old, true);
863 if (result)
864 goto out_free_levels;
865
866 result = acpi_video_bqc_quirk(device, max_level, level_old);
867 if (result)
868 goto out_free_levels;
869 /*
870 * cap._BQC may get cleared due to _BQC is found to be broken
871 * in acpi_video_bqc_quirk, so check again here.
872 */
873 if (!device->cap._BQC)
874 goto set_level;
875
876 level = acpi_video_bqc_value_to_level(device, level_old);
877 /*
878 * On some buggy laptops, _BQC returns an uninitialized
879 * value when invoked for the first time, i.e.
880 * level_old is invalid (no matter whether it's a level
881 * or an index). Set the backlight to max_level in this case.
882 */
883 for (i = 2; i < br->count; i++)
884 if (level == br->levels[i])
885 break;
886 if (i == br->count || !level)
887 level = max_level;
888
889 set_level:
890 result = acpi_video_device_lcd_set_level(device, level);
891 if (result)
892 goto out_free_levels;
893
894 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
895 "found %d brightness levels\n", count - 2));
896 kfree(obj);
897 return result;
898
899 out_free_levels:
900 kfree(br->levels);
901 out_free:
902 kfree(br);
903 out:
904 device->brightness = NULL;
905 kfree(obj);
906 return result;
907 }
908
909 /*
910 * Arg:
911 * device : video output device (LCD, CRT, ..)
912 *
913 * Return Value:
914 * None
915 *
916 * Find out all required AML methods defined under the output
917 * device.
918 */
919
920 static void acpi_video_device_find_cap(struct acpi_video_device *device)
921 {
922 if (acpi_has_method(device->dev->handle, "_ADR"))
923 device->cap._ADR = 1;
924 if (acpi_has_method(device->dev->handle, "_BCL"))
925 device->cap._BCL = 1;
926 if (acpi_has_method(device->dev->handle, "_BCM"))
927 device->cap._BCM = 1;
928 if (acpi_has_method(device->dev->handle, "_BQC")) {
929 device->cap._BQC = 1;
930 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
931 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
932 device->cap._BCQ = 1;
933 }
934
935 if (acpi_has_method(device->dev->handle, "_DDC"))
936 device->cap._DDC = 1;
937 }
938
939 /*
940 * Arg:
941 * device : video output device (VGA)
942 *
943 * Return Value:
944 * None
945 *
946 * Find out all required AML methods defined under the video bus device.
947 */
948
949 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
950 {
951 if (acpi_has_method(video->device->handle, "_DOS"))
952 video->cap._DOS = 1;
953 if (acpi_has_method(video->device->handle, "_DOD"))
954 video->cap._DOD = 1;
955 if (acpi_has_method(video->device->handle, "_ROM"))
956 video->cap._ROM = 1;
957 if (acpi_has_method(video->device->handle, "_GPD"))
958 video->cap._GPD = 1;
959 if (acpi_has_method(video->device->handle, "_SPD"))
960 video->cap._SPD = 1;
961 if (acpi_has_method(video->device->handle, "_VPO"))
962 video->cap._VPO = 1;
963 }
964
965 /*
966 * Check whether the video bus device has required AML method to
967 * support the desired features
968 */
969
970 static int acpi_video_bus_check(struct acpi_video_bus *video)
971 {
972 acpi_status status = -ENOENT;
973 struct pci_dev *dev;
974
975 if (!video)
976 return -EINVAL;
977
978 dev = acpi_get_pci_dev(video->device->handle);
979 if (!dev)
980 return -ENODEV;
981 pci_dev_put(dev);
982
983 /*
984 * Since there is no HID, CID and so on for VGA driver, we have
985 * to check well known required nodes.
986 */
987
988 /* Does this device support video switching? */
989 if (video->cap._DOS || video->cap._DOD) {
990 if (!video->cap._DOS) {
991 printk(KERN_WARNING FW_BUG
992 "ACPI(%s) defines _DOD but not _DOS\n",
993 acpi_device_bid(video->device));
994 }
995 video->flags.multihead = 1;
996 status = 0;
997 }
998
999 /* Does this device support retrieving a video ROM? */
1000 if (video->cap._ROM) {
1001 video->flags.rom = 1;
1002 status = 0;
1003 }
1004
1005 /* Does this device support configuring which video device to POST? */
1006 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1007 video->flags.post = 1;
1008 status = 0;
1009 }
1010
1011 return status;
1012 }
1013
1014 /*
1015 * --------------------------------------------------------------------------
1016 * Driver Interface
1017 * --------------------------------------------------------------------------
1018 */
1019
1020 /* device interface */
1021 static struct acpi_video_device_attrib *
1022 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1023 {
1024 struct acpi_video_enumerated_device *ids;
1025 int i;
1026
1027 for (i = 0; i < video->attached_count; i++) {
1028 ids = &video->attached_array[i];
1029 if ((ids->value.int_val & 0xffff) == device_id)
1030 return &ids->value.attrib;
1031 }
1032
1033 return NULL;
1034 }
1035
1036 static int
1037 acpi_video_get_device_type(struct acpi_video_bus *video,
1038 unsigned long device_id)
1039 {
1040 struct acpi_video_enumerated_device *ids;
1041 int i;
1042
1043 for (i = 0; i < video->attached_count; i++) {
1044 ids = &video->attached_array[i];
1045 if ((ids->value.int_val & 0xffff) == device_id)
1046 return ids->value.int_val;
1047 }
1048
1049 return 0;
1050 }
1051
1052 static int
1053 acpi_video_bus_get_one_device(struct acpi_device *device,
1054 struct acpi_video_bus *video)
1055 {
1056 unsigned long long device_id;
1057 int status, device_type;
1058 struct acpi_video_device *data;
1059 struct acpi_video_device_attrib *attribute;
1060
1061 status =
1062 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1063 /* Some device omits _ADR, we skip them instead of fail */
1064 if (ACPI_FAILURE(status))
1065 return 0;
1066
1067 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1068 if (!data)
1069 return -ENOMEM;
1070
1071 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1072 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1073 device->driver_data = data;
1074
1075 data->device_id = device_id;
1076 data->video = video;
1077 data->dev = device;
1078 INIT_DELAYED_WORK(&data->switch_brightness_work,
1079 acpi_video_switch_brightness);
1080
1081 attribute = acpi_video_get_device_attr(video, device_id);
1082
1083 if (attribute && (attribute->device_id_scheme || device_id_scheme)) {
1084 switch (attribute->display_type) {
1085 case ACPI_VIDEO_DISPLAY_CRT:
1086 data->flags.crt = 1;
1087 break;
1088 case ACPI_VIDEO_DISPLAY_TV:
1089 data->flags.tvout = 1;
1090 break;
1091 case ACPI_VIDEO_DISPLAY_DVI:
1092 data->flags.dvi = 1;
1093 break;
1094 case ACPI_VIDEO_DISPLAY_LCD:
1095 data->flags.lcd = 1;
1096 break;
1097 default:
1098 data->flags.unknown = 1;
1099 break;
1100 }
1101 if (attribute->bios_can_detect)
1102 data->flags.bios = 1;
1103 } else {
1104 /* Check for legacy IDs */
1105 device_type = acpi_video_get_device_type(video, device_id);
1106 /* Ignore bits 16 and 18-20 */
1107 switch (device_type & 0xffe2ffff) {
1108 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1109 data->flags.crt = 1;
1110 break;
1111 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1112 data->flags.lcd = 1;
1113 break;
1114 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1115 data->flags.tvout = 1;
1116 break;
1117 default:
1118 data->flags.unknown = 1;
1119 }
1120 }
1121
1122 acpi_video_device_bind(video, data);
1123 acpi_video_device_find_cap(data);
1124
1125 mutex_lock(&video->device_list_lock);
1126 list_add_tail(&data->entry, &video->video_device_list);
1127 mutex_unlock(&video->device_list_lock);
1128
1129 return status;
1130 }
1131
1132 /*
1133 * Arg:
1134 * video : video bus device
1135 *
1136 * Return:
1137 * none
1138 *
1139 * Enumerate the video device list of the video bus,
1140 * bind the ids with the corresponding video devices
1141 * under the video bus.
1142 */
1143
1144 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1145 {
1146 struct acpi_video_device *dev;
1147
1148 mutex_lock(&video->device_list_lock);
1149
1150 list_for_each_entry(dev, &video->video_device_list, entry)
1151 acpi_video_device_bind(video, dev);
1152
1153 mutex_unlock(&video->device_list_lock);
1154 }
1155
1156 /*
1157 * Arg:
1158 * video : video bus device
1159 * device : video output device under the video
1160 * bus
1161 *
1162 * Return:
1163 * none
1164 *
1165 * Bind the ids with the corresponding video devices
1166 * under the video bus.
1167 */
1168
1169 static void
1170 acpi_video_device_bind(struct acpi_video_bus *video,
1171 struct acpi_video_device *device)
1172 {
1173 struct acpi_video_enumerated_device *ids;
1174 int i;
1175
1176 for (i = 0; i < video->attached_count; i++) {
1177 ids = &video->attached_array[i];
1178 if (device->device_id == (ids->value.int_val & 0xffff)) {
1179 ids->bind_info = device;
1180 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1181 }
1182 }
1183 }
1184
1185 static bool acpi_video_device_in_dod(struct acpi_video_device *device)
1186 {
1187 struct acpi_video_bus *video = device->video;
1188 int i;
1189
1190 /*
1191 * If we have a broken _DOD or we have more than 8 output devices
1192 * under the graphics controller node that we can't proper deal with
1193 * in the operation region code currently, no need to test.
1194 */
1195 if (!video->attached_count || video->child_count > 8)
1196 return true;
1197
1198 for (i = 0; i < video->attached_count; i++) {
1199 if ((video->attached_array[i].value.int_val & 0xfff) ==
1200 (device->device_id & 0xfff))
1201 return true;
1202 }
1203
1204 return false;
1205 }
1206
1207 /*
1208 * Arg:
1209 * video : video bus device
1210 *
1211 * Return:
1212 * < 0 : error
1213 *
1214 * Call _DOD to enumerate all devices attached to display adapter
1215 *
1216 */
1217
1218 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1219 {
1220 int status;
1221 int count;
1222 int i;
1223 struct acpi_video_enumerated_device *active_list;
1224 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1225 union acpi_object *dod = NULL;
1226 union acpi_object *obj;
1227
1228 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1229 if (!ACPI_SUCCESS(status)) {
1230 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1231 return status;
1232 }
1233
1234 dod = buffer.pointer;
1235 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1236 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1237 status = -EFAULT;
1238 goto out;
1239 }
1240
1241 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1242 dod->package.count));
1243
1244 active_list = kcalloc(1 + dod->package.count,
1245 sizeof(struct acpi_video_enumerated_device),
1246 GFP_KERNEL);
1247 if (!active_list) {
1248 status = -ENOMEM;
1249 goto out;
1250 }
1251
1252 count = 0;
1253 for (i = 0; i < dod->package.count; i++) {
1254 obj = &dod->package.elements[i];
1255
1256 if (obj->type != ACPI_TYPE_INTEGER) {
1257 printk(KERN_ERR PREFIX
1258 "Invalid _DOD data in element %d\n", i);
1259 continue;
1260 }
1261
1262 active_list[count].value.int_val = obj->integer.value;
1263 active_list[count].bind_info = NULL;
1264 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1265 (int)obj->integer.value));
1266 count++;
1267 }
1268
1269 kfree(video->attached_array);
1270
1271 video->attached_array = active_list;
1272 video->attached_count = count;
1273
1274 out:
1275 kfree(buffer.pointer);
1276 return status;
1277 }
1278
1279 static int
1280 acpi_video_get_next_level(struct acpi_video_device *device,
1281 u32 level_current, u32 event)
1282 {
1283 int min, max, min_above, max_below, i, l, delta = 255;
1284 max = max_below = 0;
1285 min = min_above = 255;
1286 /* Find closest level to level_current */
1287 for (i = 2; i < device->brightness->count; i++) {
1288 l = device->brightness->levels[i];
1289 if (abs(l - level_current) < abs(delta)) {
1290 delta = l - level_current;
1291 if (!delta)
1292 break;
1293 }
1294 }
1295 /* Ajust level_current to closest available level */
1296 level_current += delta;
1297 for (i = 2; i < device->brightness->count; i++) {
1298 l = device->brightness->levels[i];
1299 if (l < min)
1300 min = l;
1301 if (l > max)
1302 max = l;
1303 if (l < min_above && l > level_current)
1304 min_above = l;
1305 if (l > max_below && l < level_current)
1306 max_below = l;
1307 }
1308
1309 switch (event) {
1310 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1311 return (level_current < max) ? min_above : min;
1312 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1313 return (level_current < max) ? min_above : max;
1314 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1315 return (level_current > min) ? max_below : min;
1316 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1317 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1318 return 0;
1319 default:
1320 return level_current;
1321 }
1322 }
1323
1324 static void
1325 acpi_video_switch_brightness(struct work_struct *work)
1326 {
1327 struct acpi_video_device *device = container_of(to_delayed_work(work),
1328 struct acpi_video_device, switch_brightness_work);
1329 unsigned long long level_current, level_next;
1330 int event = device->switch_brightness_event;
1331 int result = -EINVAL;
1332
1333 /* no warning message if acpi_backlight=vendor or a quirk is used */
1334 if (!device->backlight)
1335 return;
1336
1337 if (!device->brightness)
1338 goto out;
1339
1340 result = acpi_video_device_lcd_get_level_current(device,
1341 &level_current,
1342 false);
1343 if (result)
1344 goto out;
1345
1346 level_next = acpi_video_get_next_level(device, level_current, event);
1347
1348 result = acpi_video_device_lcd_set_level(device, level_next);
1349
1350 if (!result)
1351 backlight_force_update(device->backlight,
1352 BACKLIGHT_UPDATE_HOTKEY);
1353
1354 out:
1355 if (result)
1356 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1357 }
1358
1359 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1360 void **edid)
1361 {
1362 struct acpi_video_bus *video;
1363 struct acpi_video_device *video_device;
1364 union acpi_object *buffer = NULL;
1365 acpi_status status;
1366 int i, length;
1367
1368 if (!device || !acpi_driver_data(device))
1369 return -EINVAL;
1370
1371 video = acpi_driver_data(device);
1372
1373 for (i = 0; i < video->attached_count; i++) {
1374 video_device = video->attached_array[i].bind_info;
1375 length = 256;
1376
1377 if (!video_device)
1378 continue;
1379
1380 if (!video_device->cap._DDC)
1381 continue;
1382
1383 if (type) {
1384 switch (type) {
1385 case ACPI_VIDEO_DISPLAY_CRT:
1386 if (!video_device->flags.crt)
1387 continue;
1388 break;
1389 case ACPI_VIDEO_DISPLAY_TV:
1390 if (!video_device->flags.tvout)
1391 continue;
1392 break;
1393 case ACPI_VIDEO_DISPLAY_DVI:
1394 if (!video_device->flags.dvi)
1395 continue;
1396 break;
1397 case ACPI_VIDEO_DISPLAY_LCD:
1398 if (!video_device->flags.lcd)
1399 continue;
1400 break;
1401 }
1402 } else if (video_device->device_id != device_id) {
1403 continue;
1404 }
1405
1406 status = acpi_video_device_EDID(video_device, &buffer, length);
1407
1408 if (ACPI_FAILURE(status) || !buffer ||
1409 buffer->type != ACPI_TYPE_BUFFER) {
1410 length = 128;
1411 status = acpi_video_device_EDID(video_device, &buffer,
1412 length);
1413 if (ACPI_FAILURE(status) || !buffer ||
1414 buffer->type != ACPI_TYPE_BUFFER) {
1415 continue;
1416 }
1417 }
1418
1419 *edid = buffer->buffer.pointer;
1420 return length;
1421 }
1422
1423 return -ENODEV;
1424 }
1425 EXPORT_SYMBOL(acpi_video_get_edid);
1426
1427 static int
1428 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1429 struct acpi_device *device)
1430 {
1431 int status = 0;
1432 struct acpi_device *dev;
1433
1434 /*
1435 * There are systems where video module known to work fine regardless
1436 * of broken _DOD and ignoring returned value here doesn't cause
1437 * any issues later.
1438 */
1439 acpi_video_device_enumerate(video);
1440
1441 list_for_each_entry(dev, &device->children, node) {
1442
1443 status = acpi_video_bus_get_one_device(dev, video);
1444 if (status) {
1445 dev_err(&dev->dev, "Can't attach device\n");
1446 break;
1447 }
1448 video->child_count++;
1449 }
1450 return status;
1451 }
1452
1453 /* acpi_video interface */
1454
1455 /*
1456 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1457 * preform any automatic brightness change on receiving a notification.
1458 */
1459 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1460 {
1461 return acpi_video_bus_DOS(video, 0,
1462 acpi_osi_is_win8() ? 1 : 0);
1463 }
1464
1465 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1466 {
1467 return acpi_video_bus_DOS(video, 0,
1468 acpi_osi_is_win8() ? 0 : 1);
1469 }
1470
1471 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1472 {
1473 struct acpi_video_bus *video = acpi_driver_data(device);
1474 struct input_dev *input;
1475 int keycode = 0;
1476
1477 if (!video || !video->input)
1478 return;
1479
1480 input = video->input;
1481
1482 switch (event) {
1483 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1484 * most likely via hotkey. */
1485 keycode = KEY_SWITCHVIDEOMODE;
1486 break;
1487
1488 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1489 * connector. */
1490 acpi_video_device_enumerate(video);
1491 acpi_video_device_rebind(video);
1492 keycode = KEY_SWITCHVIDEOMODE;
1493 break;
1494
1495 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1496 keycode = KEY_SWITCHVIDEOMODE;
1497 break;
1498 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1499 keycode = KEY_VIDEO_NEXT;
1500 break;
1501 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1502 keycode = KEY_VIDEO_PREV;
1503 break;
1504
1505 default:
1506 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1507 "Unsupported event [0x%x]\n", event));
1508 break;
1509 }
1510
1511 if (acpi_notifier_call_chain(device, event, 0))
1512 /* Something vetoed the keypress. */
1513 keycode = 0;
1514
1515 if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) {
1516 input_report_key(input, keycode, 1);
1517 input_sync(input);
1518 input_report_key(input, keycode, 0);
1519 input_sync(input);
1520 }
1521
1522 return;
1523 }
1524
1525 static void brightness_switch_event(struct acpi_video_device *video_device,
1526 u32 event)
1527 {
1528 if (!brightness_switch_enabled)
1529 return;
1530
1531 video_device->switch_brightness_event = event;
1532 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1533 }
1534
1535 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1536 {
1537 struct acpi_video_device *video_device = data;
1538 struct acpi_device *device = NULL;
1539 struct acpi_video_bus *bus;
1540 struct input_dev *input;
1541 int keycode = 0;
1542
1543 if (!video_device)
1544 return;
1545
1546 device = video_device->dev;
1547 bus = video_device->video;
1548 input = bus->input;
1549
1550 switch (event) {
1551 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1552 brightness_switch_event(video_device, event);
1553 keycode = KEY_BRIGHTNESS_CYCLE;
1554 break;
1555 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1556 brightness_switch_event(video_device, event);
1557 keycode = KEY_BRIGHTNESSUP;
1558 break;
1559 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1560 brightness_switch_event(video_device, event);
1561 keycode = KEY_BRIGHTNESSDOWN;
1562 break;
1563 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1564 brightness_switch_event(video_device, event);
1565 keycode = KEY_BRIGHTNESS_ZERO;
1566 break;
1567 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1568 brightness_switch_event(video_device, event);
1569 keycode = KEY_DISPLAY_OFF;
1570 break;
1571 default:
1572 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1573 "Unsupported event [0x%x]\n", event));
1574 break;
1575 }
1576
1577 acpi_notifier_call_chain(device, event, 0);
1578
1579 if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) {
1580 input_report_key(input, keycode, 1);
1581 input_sync(input);
1582 input_report_key(input, keycode, 0);
1583 input_sync(input);
1584 }
1585
1586 return;
1587 }
1588
1589 static int acpi_video_resume(struct notifier_block *nb,
1590 unsigned long val, void *ign)
1591 {
1592 struct acpi_video_bus *video;
1593 struct acpi_video_device *video_device;
1594 int i;
1595
1596 switch (val) {
1597 case PM_HIBERNATION_PREPARE:
1598 case PM_SUSPEND_PREPARE:
1599 case PM_RESTORE_PREPARE:
1600 return NOTIFY_DONE;
1601 }
1602
1603 video = container_of(nb, struct acpi_video_bus, pm_nb);
1604
1605 dev_info(&video->device->dev, "Restoring backlight state\n");
1606
1607 for (i = 0; i < video->attached_count; i++) {
1608 video_device = video->attached_array[i].bind_info;
1609 if (video_device && video_device->brightness)
1610 acpi_video_device_lcd_set_level(video_device,
1611 video_device->brightness->curr);
1612 }
1613
1614 return NOTIFY_OK;
1615 }
1616
1617 static acpi_status
1618 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1619 void **return_value)
1620 {
1621 struct acpi_device *device = context;
1622 struct acpi_device *sibling;
1623 int result;
1624
1625 if (handle == device->handle)
1626 return AE_CTRL_TERMINATE;
1627
1628 result = acpi_bus_get_device(handle, &sibling);
1629 if (result)
1630 return AE_OK;
1631
1632 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1633 return AE_ALREADY_EXISTS;
1634
1635 return AE_OK;
1636 }
1637
1638 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1639 {
1640 struct backlight_properties props;
1641 struct pci_dev *pdev;
1642 acpi_handle acpi_parent;
1643 struct device *parent = NULL;
1644 int result;
1645 static int count;
1646 char *name;
1647
1648 result = acpi_video_init_brightness(device);
1649 if (result)
1650 return;
1651
1652 if (disable_backlight_sysfs_if > 0)
1653 return;
1654
1655 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1656 if (!name)
1657 return;
1658 count++;
1659
1660 acpi_get_parent(device->dev->handle, &acpi_parent);
1661
1662 pdev = acpi_get_pci_dev(acpi_parent);
1663 if (pdev) {
1664 parent = &pdev->dev;
1665 pci_dev_put(pdev);
1666 }
1667
1668 memset(&props, 0, sizeof(struct backlight_properties));
1669 props.type = BACKLIGHT_FIRMWARE;
1670 props.max_brightness = device->brightness->count - 3;
1671 device->backlight = backlight_device_register(name,
1672 parent,
1673 device,
1674 &acpi_backlight_ops,
1675 &props);
1676 kfree(name);
1677 if (IS_ERR(device->backlight)) {
1678 device->backlight = NULL;
1679 return;
1680 }
1681
1682 /*
1683 * Save current brightness level in case we have to restore it
1684 * before acpi_video_device_lcd_set_level() is called next time.
1685 */
1686 device->backlight->props.brightness =
1687 acpi_video_get_brightness(device->backlight);
1688
1689 device->cooling_dev = thermal_cooling_device_register("LCD",
1690 device->dev, &video_cooling_ops);
1691 if (IS_ERR(device->cooling_dev)) {
1692 /*
1693 * Set cooling_dev to NULL so we don't crash trying to free it.
1694 * Also, why the hell we are returning early and not attempt to
1695 * register video output if cooling device registration failed?
1696 * -- dtor
1697 */
1698 device->cooling_dev = NULL;
1699 return;
1700 }
1701
1702 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1703 device->cooling_dev->id);
1704 result = sysfs_create_link(&device->dev->dev.kobj,
1705 &device->cooling_dev->device.kobj,
1706 "thermal_cooling");
1707 if (result)
1708 printk(KERN_ERR PREFIX "Create sysfs link\n");
1709 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1710 &device->dev->dev.kobj, "device");
1711 if (result)
1712 printk(KERN_ERR PREFIX "Create sysfs link\n");
1713 }
1714
1715 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)
1716 {
1717 struct acpi_video_device *dev;
1718 union acpi_object *levels;
1719
1720 mutex_lock(&video->device_list_lock);
1721 list_for_each_entry(dev, &video->video_device_list, entry) {
1722 if (!acpi_video_device_lcd_query_levels(dev, &levels))
1723 kfree(levels);
1724 }
1725 mutex_unlock(&video->device_list_lock);
1726 }
1727
1728 static bool acpi_video_should_register_backlight(struct acpi_video_device *dev)
1729 {
1730 /*
1731 * Do not create backlight device for video output
1732 * device that is not in the enumerated list.
1733 */
1734 if (!acpi_video_device_in_dod(dev)) {
1735 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n");
1736 return false;
1737 }
1738
1739 if (only_lcd)
1740 return dev->flags.lcd;
1741 return true;
1742 }
1743
1744 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1745 {
1746 struct acpi_video_device *dev;
1747
1748 if (video->backlight_registered)
1749 return 0;
1750
1751 acpi_video_run_bcl_for_osi(video);
1752
1753 if (acpi_video_get_backlight_type() != acpi_backlight_video)
1754 return 0;
1755
1756 mutex_lock(&video->device_list_lock);
1757 list_for_each_entry(dev, &video->video_device_list, entry) {
1758 if (acpi_video_should_register_backlight(dev))
1759 acpi_video_dev_register_backlight(dev);
1760 }
1761 mutex_unlock(&video->device_list_lock);
1762
1763 video->backlight_registered = true;
1764
1765 video->pm_nb.notifier_call = acpi_video_resume;
1766 video->pm_nb.priority = 0;
1767 return register_pm_notifier(&video->pm_nb);
1768 }
1769
1770 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1771 {
1772 if (device->backlight) {
1773 backlight_device_unregister(device->backlight);
1774 device->backlight = NULL;
1775 }
1776 if (device->brightness) {
1777 kfree(device->brightness->levels);
1778 kfree(device->brightness);
1779 device->brightness = NULL;
1780 }
1781 if (device->cooling_dev) {
1782 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1783 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1784 thermal_cooling_device_unregister(device->cooling_dev);
1785 device->cooling_dev = NULL;
1786 }
1787 }
1788
1789 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1790 {
1791 struct acpi_video_device *dev;
1792 int error;
1793
1794 if (!video->backlight_registered)
1795 return 0;
1796
1797 error = unregister_pm_notifier(&video->pm_nb);
1798
1799 mutex_lock(&video->device_list_lock);
1800 list_for_each_entry(dev, &video->video_device_list, entry)
1801 acpi_video_dev_unregister_backlight(dev);
1802 mutex_unlock(&video->device_list_lock);
1803
1804 video->backlight_registered = false;
1805
1806 return error;
1807 }
1808
1809 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1810 {
1811 acpi_status status;
1812 struct acpi_device *adev = device->dev;
1813
1814 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1815 acpi_video_device_notify, device);
1816 if (ACPI_FAILURE(status))
1817 dev_err(&adev->dev, "Error installing notify handler\n");
1818 else
1819 device->flags.notify = 1;
1820 }
1821
1822 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1823 {
1824 struct input_dev *input;
1825 struct acpi_video_device *dev;
1826 int error;
1827
1828 video->input = input = input_allocate_device();
1829 if (!input) {
1830 error = -ENOMEM;
1831 goto out;
1832 }
1833
1834 error = acpi_video_bus_start_devices(video);
1835 if (error)
1836 goto err_free_input;
1837
1838 snprintf(video->phys, sizeof(video->phys),
1839 "%s/video/input0", acpi_device_hid(video->device));
1840
1841 input->name = acpi_device_name(video->device);
1842 input->phys = video->phys;
1843 input->id.bustype = BUS_HOST;
1844 input->id.product = 0x06;
1845 input->dev.parent = &video->device->dev;
1846 input->evbit[0] = BIT(EV_KEY);
1847 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1848 set_bit(KEY_VIDEO_NEXT, input->keybit);
1849 set_bit(KEY_VIDEO_PREV, input->keybit);
1850 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1851 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1852 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1853 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1854 set_bit(KEY_DISPLAY_OFF, input->keybit);
1855
1856 error = input_register_device(input);
1857 if (error)
1858 goto err_stop_dev;
1859
1860 mutex_lock(&video->device_list_lock);
1861 list_for_each_entry(dev, &video->video_device_list, entry)
1862 acpi_video_dev_add_notify_handler(dev);
1863 mutex_unlock(&video->device_list_lock);
1864
1865 return 0;
1866
1867 err_stop_dev:
1868 acpi_video_bus_stop_devices(video);
1869 err_free_input:
1870 input_free_device(input);
1871 video->input = NULL;
1872 out:
1873 return error;
1874 }
1875
1876 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1877 {
1878 if (dev->flags.notify) {
1879 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1880 acpi_video_device_notify);
1881 dev->flags.notify = 0;
1882 }
1883 }
1884
1885 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1886 {
1887 struct acpi_video_device *dev;
1888
1889 mutex_lock(&video->device_list_lock);
1890 list_for_each_entry(dev, &video->video_device_list, entry)
1891 acpi_video_dev_remove_notify_handler(dev);
1892 mutex_unlock(&video->device_list_lock);
1893
1894 acpi_video_bus_stop_devices(video);
1895 input_unregister_device(video->input);
1896 video->input = NULL;
1897 }
1898
1899 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1900 {
1901 struct acpi_video_device *dev, *next;
1902
1903 mutex_lock(&video->device_list_lock);
1904 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1905 list_del(&dev->entry);
1906 kfree(dev);
1907 }
1908 mutex_unlock(&video->device_list_lock);
1909
1910 return 0;
1911 }
1912
1913 static int instance;
1914
1915 static int acpi_video_bus_add(struct acpi_device *device)
1916 {
1917 struct acpi_video_bus *video;
1918 int error;
1919 acpi_status status;
1920
1921 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1922 device->parent->handle, 1,
1923 acpi_video_bus_match, NULL,
1924 device, NULL);
1925 if (status == AE_ALREADY_EXISTS) {
1926 printk(KERN_WARNING FW_BUG
1927 "Duplicate ACPI video bus devices for the"
1928 " same VGA controller, please try module "
1929 "parameter \"video.allow_duplicates=1\""
1930 "if the current driver doesn't work.\n");
1931 if (!allow_duplicates)
1932 return -ENODEV;
1933 }
1934
1935 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1936 if (!video)
1937 return -ENOMEM;
1938
1939 /* a hack to fix the duplicate name "VID" problem on T61 */
1940 if (!strcmp(device->pnp.bus_id, "VID")) {
1941 if (instance)
1942 device->pnp.bus_id[3] = '0' + instance;
1943 instance++;
1944 }
1945 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1946 if (!strcmp(device->pnp.bus_id, "VGA")) {
1947 if (instance)
1948 device->pnp.bus_id[3] = '0' + instance;
1949 instance++;
1950 }
1951
1952 video->device = device;
1953 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1954 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1955 device->driver_data = video;
1956
1957 acpi_video_bus_find_cap(video);
1958 error = acpi_video_bus_check(video);
1959 if (error)
1960 goto err_free_video;
1961
1962 mutex_init(&video->device_list_lock);
1963 INIT_LIST_HEAD(&video->video_device_list);
1964
1965 error = acpi_video_bus_get_devices(video, device);
1966 if (error)
1967 goto err_put_video;
1968
1969 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
1970 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1971 video->flags.multihead ? "yes" : "no",
1972 video->flags.rom ? "yes" : "no",
1973 video->flags.post ? "yes" : "no");
1974 mutex_lock(&video_list_lock);
1975 list_add_tail(&video->entry, &video_bus_head);
1976 mutex_unlock(&video_list_lock);
1977
1978 acpi_video_bus_register_backlight(video);
1979 acpi_video_bus_add_notify_handler(video);
1980
1981 return 0;
1982
1983 err_put_video:
1984 acpi_video_bus_put_devices(video);
1985 kfree(video->attached_array);
1986 err_free_video:
1987 kfree(video);
1988 device->driver_data = NULL;
1989
1990 return error;
1991 }
1992
1993 static int acpi_video_bus_remove(struct acpi_device *device)
1994 {
1995 struct acpi_video_bus *video = NULL;
1996
1997
1998 if (!device || !acpi_driver_data(device))
1999 return -EINVAL;
2000
2001 video = acpi_driver_data(device);
2002
2003 acpi_video_bus_remove_notify_handler(video);
2004 acpi_video_bus_unregister_backlight(video);
2005 acpi_video_bus_put_devices(video);
2006
2007 mutex_lock(&video_list_lock);
2008 list_del(&video->entry);
2009 mutex_unlock(&video_list_lock);
2010
2011 kfree(video->attached_array);
2012 kfree(video);
2013
2014 return 0;
2015 }
2016
2017 static int __init is_i740(struct pci_dev *dev)
2018 {
2019 if (dev->device == 0x00D1)
2020 return 1;
2021 if (dev->device == 0x7000)
2022 return 1;
2023 return 0;
2024 }
2025
2026 static int __init intel_opregion_present(void)
2027 {
2028 int opregion = 0;
2029 struct pci_dev *dev = NULL;
2030 u32 address;
2031
2032 for_each_pci_dev(dev) {
2033 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2034 continue;
2035 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2036 continue;
2037 /* We don't want to poke around undefined i740 registers */
2038 if (is_i740(dev))
2039 continue;
2040 pci_read_config_dword(dev, 0xfc, &address);
2041 if (!address)
2042 continue;
2043 opregion = 1;
2044 }
2045 return opregion;
2046 }
2047
2048 int acpi_video_register(void)
2049 {
2050 int ret = 0;
2051
2052 mutex_lock(&register_done_mutex);
2053 if (completion_done(&register_done)) {
2054 /*
2055 * if the function of acpi_video_register is already called,
2056 * don't register the acpi_vide_bus again and return no error.
2057 */
2058 goto leave;
2059 }
2060
2061 mutex_init(&video_list_lock);
2062 INIT_LIST_HEAD(&video_bus_head);
2063
2064 dmi_check_system(video_dmi_table);
2065
2066 ret = acpi_bus_register_driver(&acpi_video_bus);
2067 if (ret)
2068 goto leave;
2069
2070 /*
2071 * When the acpi_video_bus is loaded successfully, increase
2072 * the counter reference.
2073 */
2074 complete(&register_done);
2075
2076 leave:
2077 mutex_unlock(&register_done_mutex);
2078 return ret;
2079 }
2080 EXPORT_SYMBOL(acpi_video_register);
2081
2082 void acpi_video_unregister(void)
2083 {
2084 mutex_lock(&register_done_mutex);
2085 if (completion_done(&register_done)) {
2086 acpi_bus_unregister_driver(&acpi_video_bus);
2087 reinit_completion(&register_done);
2088 }
2089 mutex_unlock(&register_done_mutex);
2090 }
2091 EXPORT_SYMBOL(acpi_video_unregister);
2092
2093 void acpi_video_unregister_backlight(void)
2094 {
2095 struct acpi_video_bus *video;
2096
2097 mutex_lock(&register_done_mutex);
2098 if (completion_done(&register_done)) {
2099 mutex_lock(&video_list_lock);
2100 list_for_each_entry(video, &video_bus_head, entry)
2101 acpi_video_bus_unregister_backlight(video);
2102 mutex_unlock(&video_list_lock);
2103 }
2104 mutex_unlock(&register_done_mutex);
2105 }
2106
2107 bool acpi_video_handles_brightness_key_presses(void)
2108 {
2109 bool have_video_busses;
2110
2111 wait_for_completion(&register_done);
2112 mutex_lock(&video_list_lock);
2113 have_video_busses = !list_empty(&video_bus_head);
2114 mutex_unlock(&video_list_lock);
2115
2116 return have_video_busses &&
2117 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS);
2118 }
2119 EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses);
2120
2121 /*
2122 * This is kind of nasty. Hardware using Intel chipsets may require
2123 * the video opregion code to be run first in order to initialise
2124 * state before any ACPI video calls are made. To handle this we defer
2125 * registration of the video class until the opregion code has run.
2126 */
2127
2128 static int __init acpi_video_init(void)
2129 {
2130 /*
2131 * Let the module load even if ACPI is disabled (e.g. due to
2132 * a broken BIOS) so that i915.ko can still be loaded on such
2133 * old systems without an AcpiOpRegion.
2134 *
2135 * acpi_video_register() will report -ENODEV later as well due
2136 * to acpi_disabled when i915.ko tries to register itself afterwards.
2137 */
2138 if (acpi_disabled)
2139 return 0;
2140
2141 if (intel_opregion_present())
2142 return 0;
2143
2144 return acpi_video_register();
2145 }
2146
2147 static void __exit acpi_video_exit(void)
2148 {
2149 acpi_video_detect_exit();
2150 acpi_video_unregister();
2151
2152 return;
2153 }
2154
2155 module_init(acpi_video_init);
2156 module_exit(acpi_video_exit);
Linux kernel - Deliverables
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