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drivers: power: report battery voltage in AOSP compatible format
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / acpi / video.c
1 /*
2 * video.c - ACPI Video Driver ($Revision:$)
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 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23 *
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 */
26
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/types.h>
31 #include <linux/list.h>
32 #include <linux/mutex.h>
33 #include <linux/input.h>
34 #include <linux/backlight.h>
35 #include <linux/thermal.h>
36 #include <linux/sort.h>
37 #include <linux/pci.h>
38 #include <linux/pci_ids.h>
39 #include <linux/slab.h>
40 #include <asm/uaccess.h>
41 #include <linux/dmi.h>
42 #include <acpi/acpi_bus.h>
43 #include <acpi/acpi_drivers.h>
44 #include <linux/suspend.h>
45 #include <acpi/video.h>
46
47 #define PREFIX "ACPI: "
48
49 #define ACPI_VIDEO_BUS_NAME "Video Bus"
50 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
51 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
52 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
53 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
54 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
55 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
56
57 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
58 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
59 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
60 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
61 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
62
63 #define MAX_NAME_LEN 20
64
65 #define _COMPONENT ACPI_VIDEO_COMPONENT
66 ACPI_MODULE_NAME("video");
67
68 MODULE_AUTHOR("Bruno Ducrot");
69 MODULE_DESCRIPTION("ACPI Video Driver");
70 MODULE_LICENSE("GPL");
71
72 static bool brightness_switch_enabled = 1;
73 module_param(brightness_switch_enabled, bool, 0644);
74
75 /*
76 * By default, we don't allow duplicate ACPI video bus devices
77 * under the same VGA controller
78 */
79 static bool allow_duplicates;
80 module_param(allow_duplicates, bool, 0644);
81
82 /*
83 * Some BIOSes claim they use minimum backlight at boot,
84 * and this may bring dimming screen after boot
85 */
86 static bool use_bios_initial_backlight = 1;
87 module_param(use_bios_initial_backlight, bool, 0644);
88
89 static int register_count = 0;
90 static int acpi_video_bus_add(struct acpi_device *device);
91 static int acpi_video_bus_remove(struct acpi_device *device);
92 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
93
94 static const struct acpi_device_id video_device_ids[] = {
95 {ACPI_VIDEO_HID, 0},
96 {"", 0},
97 };
98 MODULE_DEVICE_TABLE(acpi, video_device_ids);
99
100 static struct acpi_driver acpi_video_bus = {
101 .name = "video",
102 .class = ACPI_VIDEO_CLASS,
103 .ids = video_device_ids,
104 .ops = {
105 .add = acpi_video_bus_add,
106 .remove = acpi_video_bus_remove,
107 .notify = acpi_video_bus_notify,
108 },
109 };
110
111 struct acpi_video_bus_flags {
112 u8 multihead:1; /* can switch video heads */
113 u8 rom:1; /* can retrieve a video rom */
114 u8 post:1; /* can configure the head to */
115 u8 reserved:5;
116 };
117
118 struct acpi_video_bus_cap {
119 u8 _DOS:1; /*Enable/Disable output switching */
120 u8 _DOD:1; /*Enumerate all devices attached to display adapter */
121 u8 _ROM:1; /*Get ROM Data */
122 u8 _GPD:1; /*Get POST Device */
123 u8 _SPD:1; /*Set POST Device */
124 u8 _VPO:1; /*Video POST Options */
125 u8 reserved:2;
126 };
127
128 struct acpi_video_device_attrib {
129 u32 display_index:4; /* A zero-based instance of the Display */
130 u32 display_port_attachment:4; /*This field differentiates the display type */
131 u32 display_type:4; /*Describe the specific type in use */
132 u32 vendor_specific:4; /*Chipset Vendor Specific */
133 u32 bios_can_detect:1; /*BIOS can detect the device */
134 u32 depend_on_vga:1; /*Non-VGA output device whose power is related to
135 the VGA device. */
136 u32 pipe_id:3; /*For VGA multiple-head devices. */
137 u32 reserved:10; /*Must be 0 */
138 u32 device_id_scheme:1; /*Device ID Scheme */
139 };
140
141 struct acpi_video_enumerated_device {
142 union {
143 u32 int_val;
144 struct acpi_video_device_attrib attrib;
145 } value;
146 struct acpi_video_device *bind_info;
147 };
148
149 struct acpi_video_bus {
150 struct acpi_device *device;
151 u8 dos_setting;
152 struct acpi_video_enumerated_device *attached_array;
153 u8 attached_count;
154 struct acpi_video_bus_cap cap;
155 struct acpi_video_bus_flags flags;
156 struct list_head video_device_list;
157 struct mutex device_list_lock; /* protects video_device_list */
158 struct input_dev *input;
159 char phys[32]; /* for input device */
160 struct notifier_block pm_nb;
161 };
162
163 struct acpi_video_device_flags {
164 u8 crt:1;
165 u8 lcd:1;
166 u8 tvout:1;
167 u8 dvi:1;
168 u8 bios:1;
169 u8 unknown:1;
170 u8 notify:1;
171 u8 reserved:1;
172 };
173
174 struct acpi_video_device_cap {
175 u8 _ADR:1; /*Return the unique ID */
176 u8 _BCL:1; /*Query list of brightness control levels supported */
177 u8 _BCM:1; /*Set the brightness level */
178 u8 _BQC:1; /* Get current brightness level */
179 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
180 u8 _DDC:1; /*Return the EDID for this device */
181 };
182
183 struct acpi_video_brightness_flags {
184 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
185 u8 _BCL_reversed:1; /* _BCL package is in a reversed order*/
186 u8 _BCL_use_index:1; /* levels in _BCL are index values */
187 u8 _BCM_use_index:1; /* input of _BCM is an index value */
188 u8 _BQC_use_index:1; /* _BQC returns an index value */
189 };
190
191 struct acpi_video_device_brightness {
192 int curr;
193 int count;
194 int *levels;
195 struct acpi_video_brightness_flags flags;
196 };
197
198 struct acpi_video_device {
199 unsigned long device_id;
200 struct acpi_video_device_flags flags;
201 struct acpi_video_device_cap cap;
202 struct list_head entry;
203 struct acpi_video_bus *video;
204 struct acpi_device *dev;
205 struct acpi_video_device_brightness *brightness;
206 struct backlight_device *backlight;
207 struct thermal_cooling_device *cooling_dev;
208 };
209
210 static const char device_decode[][30] = {
211 "motherboard VGA device",
212 "PCI VGA device",
213 "AGP VGA device",
214 "UNKNOWN",
215 };
216
217 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
218 static void acpi_video_device_rebind(struct acpi_video_bus *video);
219 static void acpi_video_device_bind(struct acpi_video_bus *video,
220 struct acpi_video_device *device);
221 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
222 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
223 int level);
224 static int acpi_video_device_lcd_get_level_current(
225 struct acpi_video_device *device,
226 unsigned long long *level, bool raw);
227 static int acpi_video_get_next_level(struct acpi_video_device *device,
228 u32 level_current, u32 event);
229 static int acpi_video_switch_brightness(struct acpi_video_device *device,
230 int event);
231
232 /*backlight device sysfs support*/
233 static int acpi_video_get_brightness(struct backlight_device *bd)
234 {
235 unsigned long long cur_level;
236 int i;
237 struct acpi_video_device *vd =
238 (struct acpi_video_device *)bl_get_data(bd);
239
240 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
241 return -EINVAL;
242 for (i = 2; i < vd->brightness->count; i++) {
243 if (vd->brightness->levels[i] == cur_level)
244 /* The first two entries are special - see page 575
245 of the ACPI spec 3.0 */
246 return i-2;
247 }
248 return 0;
249 }
250
251 static int acpi_video_set_brightness(struct backlight_device *bd)
252 {
253 int request_level = bd->props.brightness + 2;
254 struct acpi_video_device *vd =
255 (struct acpi_video_device *)bl_get_data(bd);
256
257 return acpi_video_device_lcd_set_level(vd,
258 vd->brightness->levels[request_level]);
259 }
260
261 static const struct backlight_ops acpi_backlight_ops = {
262 .get_brightness = acpi_video_get_brightness,
263 .update_status = acpi_video_set_brightness,
264 };
265
266 /* thermal cooling device callbacks */
267 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
268 long *state)
269 {
270 struct acpi_device *device = cooling_dev->devdata;
271 struct acpi_video_device *video = acpi_driver_data(device);
272
273 *state = video->brightness->count - 3;
274 return 0;
275 }
276
277 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
278 long *state)
279 {
280 struct acpi_device *device = cooling_dev->devdata;
281 struct acpi_video_device *video = acpi_driver_data(device);
282 unsigned long long level;
283 int offset;
284
285 if (acpi_video_device_lcd_get_level_current(video, &level, false))
286 return -EINVAL;
287 for (offset = 2; offset < video->brightness->count; offset++)
288 if (level == video->brightness->levels[offset]) {
289 *state = video->brightness->count - offset - 1;
290 return 0;
291 }
292
293 return -EINVAL;
294 }
295
296 static int
297 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
298 {
299 struct acpi_device *device = cooling_dev->devdata;
300 struct acpi_video_device *video = acpi_driver_data(device);
301 int level;
302
303 if ( state >= video->brightness->count - 2)
304 return -EINVAL;
305
306 state = video->brightness->count - state;
307 level = video->brightness->levels[state -1];
308 return acpi_video_device_lcd_set_level(video, level);
309 }
310
311 static const struct thermal_cooling_device_ops video_cooling_ops = {
312 .get_max_state = video_get_max_state,
313 .get_cur_state = video_get_cur_state,
314 .set_cur_state = video_set_cur_state,
315 };
316
317 /* --------------------------------------------------------------------------
318 Video Management
319 -------------------------------------------------------------------------- */
320
321 static int
322 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
323 union acpi_object **levels)
324 {
325 int status;
326 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
327 union acpi_object *obj;
328
329
330 *levels = NULL;
331
332 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
333 if (!ACPI_SUCCESS(status))
334 return status;
335 obj = (union acpi_object *)buffer.pointer;
336 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
337 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
338 status = -EFAULT;
339 goto err;
340 }
341
342 *levels = obj;
343
344 return 0;
345
346 err:
347 kfree(buffer.pointer);
348
349 return status;
350 }
351
352 static int
353 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
354 {
355 int status;
356 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
357 struct acpi_object_list args = { 1, &arg0 };
358 int state;
359
360 arg0.integer.value = level;
361
362 status = acpi_evaluate_object(device->dev->handle, "_BCM",
363 &args, NULL);
364 if (ACPI_FAILURE(status)) {
365 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
366 return -EIO;
367 }
368
369 device->brightness->curr = level;
370 for (state = 2; state < device->brightness->count; state++)
371 if (level == device->brightness->levels[state]) {
372 if (device->backlight)
373 device->backlight->props.brightness = state - 2;
374 return 0;
375 }
376
377 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
378 return -EINVAL;
379 }
380
381 /*
382 * For some buggy _BQC methods, we need to add a constant value to
383 * the _BQC return value to get the actual current brightness level
384 */
385
386 static int bqc_offset_aml_bug_workaround;
387 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
388 {
389 bqc_offset_aml_bug_workaround = 9;
390 return 0;
391 }
392
393 static int video_ignore_initial_backlight(const struct dmi_system_id *d)
394 {
395 use_bios_initial_backlight = 0;
396 return 0;
397 }
398
399 static struct dmi_system_id video_dmi_table[] __initdata = {
400 /*
401 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
402 */
403 {
404 .callback = video_set_bqc_offset,
405 .ident = "Acer Aspire 5720",
406 .matches = {
407 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
408 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
409 },
410 },
411 {
412 .callback = video_set_bqc_offset,
413 .ident = "Acer Aspire 5710Z",
414 .matches = {
415 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
416 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
417 },
418 },
419 {
420 .callback = video_set_bqc_offset,
421 .ident = "eMachines E510",
422 .matches = {
423 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
424 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
425 },
426 },
427 {
428 .callback = video_set_bqc_offset,
429 .ident = "Acer Aspire 5315",
430 .matches = {
431 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
432 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
433 },
434 },
435 {
436 .callback = video_set_bqc_offset,
437 .ident = "Acer Aspire 7720",
438 .matches = {
439 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
440 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
441 },
442 },
443 {
444 .callback = video_ignore_initial_backlight,
445 .ident = "HP Folio 13-2000",
446 .matches = {
447 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
448 DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13 - 2000 Notebook PC"),
449 },
450 },
451 {
452 .callback = video_ignore_initial_backlight,
453 .ident = "Fujitsu E753",
454 .matches = {
455 DMI_MATCH(DMI_BOARD_VENDOR, "FUJITSU"),
456 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E753"),
457 },
458 },
459 {
460 .callback = video_ignore_initial_backlight,
461 .ident = "HP Pavilion dm4",
462 .matches = {
463 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
464 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dm4 Notebook PC"),
465 },
466 },
467 {
468 .callback = video_ignore_initial_backlight,
469 .ident = "HP Pavilion g6 Notebook PC",
470 .matches = {
471 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
472 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion g6 Notebook PC"),
473 },
474 },
475 {
476 .callback = video_ignore_initial_backlight,
477 .ident = "HP 1000 Notebook PC",
478 .matches = {
479 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
480 DMI_MATCH(DMI_PRODUCT_NAME, "HP 1000 Notebook PC"),
481 },
482 },
483 {
484 .callback = video_ignore_initial_backlight,
485 .ident = "HP Pavilion m4",
486 .matches = {
487 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
488 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion m4 Notebook PC"),
489 },
490 },
491 {}
492 };
493
494 static unsigned long long
495 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
496 unsigned long long bqc_value)
497 {
498 unsigned long long level;
499
500 if (device->brightness->flags._BQC_use_index) {
501 /*
502 * _BQC returns an index that doesn't account for
503 * the first 2 items with special meaning, so we need
504 * to compensate for that by offsetting ourselves
505 */
506 if (device->brightness->flags._BCL_reversed)
507 bqc_value = device->brightness->count - 3 - bqc_value;
508
509 level = device->brightness->levels[bqc_value + 2];
510 } else {
511 level = bqc_value;
512 }
513
514 level += bqc_offset_aml_bug_workaround;
515
516 return level;
517 }
518
519 static int
520 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
521 unsigned long long *level, bool raw)
522 {
523 acpi_status status = AE_OK;
524 int i;
525
526 if (device->cap._BQC || device->cap._BCQ) {
527 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
528
529 status = acpi_evaluate_integer(device->dev->handle, buf,
530 NULL, level);
531 if (ACPI_SUCCESS(status)) {
532 if (raw) {
533 /*
534 * Caller has indicated he wants the raw
535 * value returned by _BQC, so don't furtherly
536 * mess with the value.
537 */
538 return 0;
539 }
540
541 *level = acpi_video_bqc_value_to_level(device, *level);
542
543 for (i = 2; i < device->brightness->count; i++)
544 if (device->brightness->levels[i] == *level) {
545 device->brightness->curr = *level;
546 return 0;
547 }
548 /*
549 * BQC returned an invalid level.
550 * Stop using it.
551 */
552 ACPI_WARNING((AE_INFO,
553 "%s returned an invalid level",
554 buf));
555 device->cap._BQC = device->cap._BCQ = 0;
556 } else {
557 /* Fixme:
558 * should we return an error or ignore this failure?
559 * dev->brightness->curr is a cached value which stores
560 * the correct current backlight level in most cases.
561 * ACPI video backlight still works w/ buggy _BQC.
562 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
563 */
564 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
565 device->cap._BQC = device->cap._BCQ = 0;
566 }
567 }
568
569 *level = device->brightness->curr;
570 return 0;
571 }
572
573 static int
574 acpi_video_device_EDID(struct acpi_video_device *device,
575 union acpi_object **edid, ssize_t length)
576 {
577 int status;
578 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
579 union acpi_object *obj;
580 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
581 struct acpi_object_list args = { 1, &arg0 };
582
583
584 *edid = NULL;
585
586 if (!device)
587 return -ENODEV;
588 if (length == 128)
589 arg0.integer.value = 1;
590 else if (length == 256)
591 arg0.integer.value = 2;
592 else
593 return -EINVAL;
594
595 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
596 if (ACPI_FAILURE(status))
597 return -ENODEV;
598
599 obj = buffer.pointer;
600
601 if (obj && obj->type == ACPI_TYPE_BUFFER)
602 *edid = obj;
603 else {
604 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
605 status = -EFAULT;
606 kfree(obj);
607 }
608
609 return status;
610 }
611
612 /* bus */
613
614 /*
615 * Arg:
616 * video : video bus device pointer
617 * bios_flag :
618 * 0. The system BIOS should NOT automatically switch(toggle)
619 * the active display output.
620 * 1. The system BIOS should automatically switch (toggle) the
621 * active display output. No switch event.
622 * 2. The _DGS value should be locked.
623 * 3. The system BIOS should not automatically switch (toggle) the
624 * active display output, but instead generate the display switch
625 * event notify code.
626 * lcd_flag :
627 * 0. The system BIOS should automatically control the brightness level
628 * of the LCD when the power changes from AC to DC
629 * 1. The system BIOS should NOT automatically control the brightness
630 * level of the LCD when the power changes from AC to DC.
631 * Return Value:
632 * -EINVAL wrong arg.
633 */
634
635 static int
636 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
637 {
638 acpi_status status;
639 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
640 struct acpi_object_list args = { 1, &arg0 };
641
642 if (!video->cap._DOS)
643 return 0;
644
645 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
646 return -EINVAL;
647 arg0.integer.value = (lcd_flag << 2) | bios_flag;
648 video->dos_setting = arg0.integer.value;
649 status = acpi_evaluate_object(video->device->handle, "_DOS",
650 &args, NULL);
651 if (ACPI_FAILURE(status))
652 return -EIO;
653
654 return 0;
655 }
656
657 /*
658 * Simple comparison function used to sort backlight levels.
659 */
660
661 static int
662 acpi_video_cmp_level(const void *a, const void *b)
663 {
664 return *(int *)a - *(int *)b;
665 }
666
667 /*
668 * Decides if _BQC/_BCQ for this system is usable
669 *
670 * We do this by changing the level first and then read out the current
671 * brightness level, if the value does not match, find out if it is using
672 * index. If not, clear the _BQC/_BCQ capability.
673 */
674 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
675 int max_level, int current_level)
676 {
677 struct acpi_video_device_brightness *br = device->brightness;
678 int result;
679 unsigned long long level;
680 int test_level;
681
682 /* don't mess with existing known broken systems */
683 if (bqc_offset_aml_bug_workaround)
684 return 0;
685
686 /*
687 * Some systems always report current brightness level as maximum
688 * through _BQC, we need to test another value for them.
689 */
690 test_level = current_level == max_level ? br->levels[2] : max_level;
691
692 result = acpi_video_device_lcd_set_level(device, test_level);
693 if (result)
694 return result;
695
696 result = acpi_video_device_lcd_get_level_current(device, &level, true);
697 if (result)
698 return result;
699
700 if (level != test_level) {
701 /* buggy _BQC found, need to find out if it uses index */
702 if (level < br->count) {
703 if (br->flags._BCL_reversed)
704 level = br->count - 3 - level;
705 if (br->levels[level + 2] == test_level)
706 br->flags._BQC_use_index = 1;
707 }
708
709 if (!br->flags._BQC_use_index)
710 device->cap._BQC = device->cap._BCQ = 0;
711 }
712
713 return 0;
714 }
715
716
717 /*
718 * Arg:
719 * device : video output device (LCD, CRT, ..)
720 *
721 * Return Value:
722 * Maximum brightness level
723 *
724 * Allocate and initialize device->brightness.
725 */
726
727 static int
728 acpi_video_init_brightness(struct acpi_video_device *device)
729 {
730 union acpi_object *obj = NULL;
731 int i, max_level = 0, count = 0, level_ac_battery = 0;
732 unsigned long long level, level_old;
733 union acpi_object *o;
734 struct acpi_video_device_brightness *br = NULL;
735 int result = -EINVAL;
736 u32 value;
737
738 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
739 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
740 "LCD brightness level\n"));
741 goto out;
742 }
743
744 if (obj->package.count < 2)
745 goto out;
746
747 br = kzalloc(sizeof(*br), GFP_KERNEL);
748 if (!br) {
749 printk(KERN_ERR "can't allocate memory\n");
750 result = -ENOMEM;
751 goto out;
752 }
753
754 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
755 GFP_KERNEL);
756 if (!br->levels) {
757 result = -ENOMEM;
758 goto out_free;
759 }
760
761 for (i = 0; i < obj->package.count; i++) {
762 o = (union acpi_object *)&obj->package.elements[i];
763 if (o->type != ACPI_TYPE_INTEGER) {
764 printk(KERN_ERR PREFIX "Invalid data\n");
765 continue;
766 }
767 value = (u32) o->integer.value;
768 /* Skip duplicate entries */
769 if (count > 2 && br->levels[count - 1] == value)
770 continue;
771
772 br->levels[count] = value;
773
774 if (br->levels[count] > max_level)
775 max_level = br->levels[count];
776 count++;
777 }
778
779 /*
780 * some buggy BIOS don't export the levels
781 * when machine is on AC/Battery in _BCL package.
782 * In this case, the first two elements in _BCL packages
783 * are also supported brightness levels that OS should take care of.
784 */
785 for (i = 2; i < count; i++) {
786 if (br->levels[i] == br->levels[0])
787 level_ac_battery++;
788 if (br->levels[i] == br->levels[1])
789 level_ac_battery++;
790 }
791
792 if (level_ac_battery < 2) {
793 level_ac_battery = 2 - level_ac_battery;
794 br->flags._BCL_no_ac_battery_levels = 1;
795 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
796 br->levels[i] = br->levels[i - level_ac_battery];
797 count += level_ac_battery;
798 } else if (level_ac_battery > 2)
799 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
800
801 /* Check if the _BCL package is in a reversed order */
802 if (max_level == br->levels[2]) {
803 br->flags._BCL_reversed = 1;
804 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
805 acpi_video_cmp_level, NULL);
806 } else if (max_level != br->levels[count - 1])
807 ACPI_ERROR((AE_INFO,
808 "Found unordered _BCL package"));
809
810 br->count = count;
811 device->brightness = br;
812
813 /* Check the input/output of _BQC/_BCL/_BCM */
814 if ((max_level < 100) && (max_level <= (count - 2)))
815 br->flags._BCL_use_index = 1;
816
817 /*
818 * _BCM is always consistent with _BCL,
819 * at least for all the laptops we have ever seen.
820 */
821 br->flags._BCM_use_index = br->flags._BCL_use_index;
822
823 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
824 br->curr = level = max_level;
825
826 if (!device->cap._BQC)
827 goto set_level;
828
829 result = acpi_video_device_lcd_get_level_current(device,
830 &level_old, true);
831 if (result)
832 goto out_free_levels;
833
834 result = acpi_video_bqc_quirk(device, max_level, level_old);
835 if (result)
836 goto out_free_levels;
837 /*
838 * cap._BQC may get cleared due to _BQC is found to be broken
839 * in acpi_video_bqc_quirk, so check again here.
840 */
841 if (!device->cap._BQC)
842 goto set_level;
843
844 if (use_bios_initial_backlight) {
845 level = acpi_video_bqc_value_to_level(device, level_old);
846 /*
847 * On some buggy laptops, _BQC returns an uninitialized
848 * value when invoked for the first time, i.e.
849 * level_old is invalid (no matter whether it's a level
850 * or an index). Set the backlight to max_level in this case.
851 */
852 for (i = 2; i < br->count; i++)
853 if (level_old == br->levels[i])
854 break;
855 if (i == br->count || !level)
856 level = max_level;
857 }
858
859 set_level:
860 result = acpi_video_device_lcd_set_level(device, level);
861 if (result)
862 goto out_free_levels;
863
864 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
865 "found %d brightness levels\n", count - 2));
866 kfree(obj);
867 return result;
868
869 out_free_levels:
870 kfree(br->levels);
871 out_free:
872 kfree(br);
873 out:
874 device->brightness = NULL;
875 kfree(obj);
876 return result;
877 }
878
879 /*
880 * Arg:
881 * device : video output device (LCD, CRT, ..)
882 *
883 * Return Value:
884 * None
885 *
886 * Find out all required AML methods defined under the output
887 * device.
888 */
889
890 static void acpi_video_device_find_cap(struct acpi_video_device *device)
891 {
892 acpi_handle h_dummy1;
893
894 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
895 device->cap._ADR = 1;
896 }
897 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
898 device->cap._BCL = 1;
899 }
900 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
901 device->cap._BCM = 1;
902 }
903 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
904 device->cap._BQC = 1;
905 else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
906 &h_dummy1))) {
907 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
908 device->cap._BCQ = 1;
909 }
910
911 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
912 device->cap._DDC = 1;
913 }
914
915 if (acpi_video_backlight_support()) {
916 struct backlight_properties props;
917 struct pci_dev *pdev;
918 acpi_handle acpi_parent;
919 struct device *parent = NULL;
920 int result;
921 static int count = 0;
922 char *name;
923
924 result = acpi_video_init_brightness(device);
925 if (result)
926 return;
927 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
928 if (!name)
929 return;
930 count++;
931
932 acpi_get_parent(device->dev->handle, &acpi_parent);
933
934 pdev = acpi_get_pci_dev(acpi_parent);
935 if (pdev) {
936 parent = &pdev->dev;
937 pci_dev_put(pdev);
938 }
939
940 memset(&props, 0, sizeof(struct backlight_properties));
941 props.type = BACKLIGHT_FIRMWARE;
942 props.max_brightness = device->brightness->count - 3;
943 device->backlight = backlight_device_register(name,
944 parent,
945 device,
946 &acpi_backlight_ops,
947 &props);
948 kfree(name);
949 if (IS_ERR(device->backlight))
950 return;
951
952 /*
953 * Save current brightness level in case we have to restore it
954 * before acpi_video_device_lcd_set_level() is called next time.
955 */
956 device->backlight->props.brightness =
957 acpi_video_get_brightness(device->backlight);
958
959 device->cooling_dev = thermal_cooling_device_register("LCD",
960 device->dev, &video_cooling_ops);
961 if (IS_ERR(device->cooling_dev)) {
962 /*
963 * Set cooling_dev to NULL so we don't crash trying to
964 * free it.
965 * Also, why the hell we are returning early and
966 * not attempt to register video output if cooling
967 * device registration failed?
968 * -- dtor
969 */
970 device->cooling_dev = NULL;
971 return;
972 }
973
974 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
975 device->cooling_dev->id);
976 result = sysfs_create_link(&device->dev->dev.kobj,
977 &device->cooling_dev->device.kobj,
978 "thermal_cooling");
979 if (result)
980 printk(KERN_ERR PREFIX "Create sysfs link\n");
981 result = sysfs_create_link(&device->cooling_dev->device.kobj,
982 &device->dev->dev.kobj, "device");
983 if (result)
984 printk(KERN_ERR PREFIX "Create sysfs link\n");
985
986 }
987 }
988
989 /*
990 * Arg:
991 * device : video output device (VGA)
992 *
993 * Return Value:
994 * None
995 *
996 * Find out all required AML methods defined under the video bus device.
997 */
998
999 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1000 {
1001 acpi_handle h_dummy1;
1002
1003 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
1004 video->cap._DOS = 1;
1005 }
1006 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
1007 video->cap._DOD = 1;
1008 }
1009 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
1010 video->cap._ROM = 1;
1011 }
1012 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
1013 video->cap._GPD = 1;
1014 }
1015 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
1016 video->cap._SPD = 1;
1017 }
1018 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
1019 video->cap._VPO = 1;
1020 }
1021 }
1022
1023 /*
1024 * Check whether the video bus device has required AML method to
1025 * support the desired features
1026 */
1027
1028 static int acpi_video_bus_check(struct acpi_video_bus *video)
1029 {
1030 acpi_status status = -ENOENT;
1031 struct pci_dev *dev;
1032
1033 if (!video)
1034 return -EINVAL;
1035
1036 dev = acpi_get_pci_dev(video->device->handle);
1037 if (!dev)
1038 return -ENODEV;
1039 pci_dev_put(dev);
1040
1041 /* Since there is no HID, CID and so on for VGA driver, we have
1042 * to check well known required nodes.
1043 */
1044
1045 /* Does this device support video switching? */
1046 if (video->cap._DOS || video->cap._DOD) {
1047 if (!video->cap._DOS) {
1048 printk(KERN_WARNING FW_BUG
1049 "ACPI(%s) defines _DOD but not _DOS\n",
1050 acpi_device_bid(video->device));
1051 }
1052 video->flags.multihead = 1;
1053 status = 0;
1054 }
1055
1056 /* Does this device support retrieving a video ROM? */
1057 if (video->cap._ROM) {
1058 video->flags.rom = 1;
1059 status = 0;
1060 }
1061
1062 /* Does this device support configuring which video device to POST? */
1063 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1064 video->flags.post = 1;
1065 status = 0;
1066 }
1067
1068 return status;
1069 }
1070
1071 /* --------------------------------------------------------------------------
1072 Driver Interface
1073 -------------------------------------------------------------------------- */
1074
1075 /* device interface */
1076 static struct acpi_video_device_attrib*
1077 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1078 {
1079 struct acpi_video_enumerated_device *ids;
1080 int i;
1081
1082 for (i = 0; i < video->attached_count; i++) {
1083 ids = &video->attached_array[i];
1084 if ((ids->value.int_val & 0xffff) == device_id)
1085 return &ids->value.attrib;
1086 }
1087
1088 return NULL;
1089 }
1090
1091 static int
1092 acpi_video_get_device_type(struct acpi_video_bus *video,
1093 unsigned long device_id)
1094 {
1095 struct acpi_video_enumerated_device *ids;
1096 int i;
1097
1098 for (i = 0; i < video->attached_count; i++) {
1099 ids = &video->attached_array[i];
1100 if ((ids->value.int_val & 0xffff) == device_id)
1101 return ids->value.int_val;
1102 }
1103
1104 return 0;
1105 }
1106
1107 static int
1108 acpi_video_bus_get_one_device(struct acpi_device *device,
1109 struct acpi_video_bus *video)
1110 {
1111 unsigned long long device_id;
1112 int status, device_type;
1113 struct acpi_video_device *data;
1114 struct acpi_video_device_attrib* attribute;
1115
1116 status =
1117 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1118 /* Some device omits _ADR, we skip them instead of fail */
1119 if (ACPI_FAILURE(status))
1120 return 0;
1121
1122 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1123 if (!data)
1124 return -ENOMEM;
1125
1126 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1127 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1128 device->driver_data = data;
1129
1130 data->device_id = device_id;
1131 data->video = video;
1132 data->dev = device;
1133
1134 attribute = acpi_video_get_device_attr(video, device_id);
1135
1136 if((attribute != NULL) && attribute->device_id_scheme) {
1137 switch (attribute->display_type) {
1138 case ACPI_VIDEO_DISPLAY_CRT:
1139 data->flags.crt = 1;
1140 break;
1141 case ACPI_VIDEO_DISPLAY_TV:
1142 data->flags.tvout = 1;
1143 break;
1144 case ACPI_VIDEO_DISPLAY_DVI:
1145 data->flags.dvi = 1;
1146 break;
1147 case ACPI_VIDEO_DISPLAY_LCD:
1148 data->flags.lcd = 1;
1149 break;
1150 default:
1151 data->flags.unknown = 1;
1152 break;
1153 }
1154 if(attribute->bios_can_detect)
1155 data->flags.bios = 1;
1156 } else {
1157 /* Check for legacy IDs */
1158 device_type = acpi_video_get_device_type(video, device_id);
1159 /* Ignore bits 16 and 18-20 */
1160 switch (device_type & 0xffe2ffff) {
1161 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1162 data->flags.crt = 1;
1163 break;
1164 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1165 data->flags.lcd = 1;
1166 break;
1167 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1168 data->flags.tvout = 1;
1169 break;
1170 default:
1171 data->flags.unknown = 1;
1172 }
1173 }
1174
1175 acpi_video_device_bind(video, data);
1176 acpi_video_device_find_cap(data);
1177
1178 status = acpi_install_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
1179 acpi_video_device_notify, data);
1180 if (ACPI_FAILURE(status))
1181 dev_err(&device->dev, "Error installing notify handler\n");
1182 else
1183 data->flags.notify = 1;
1184
1185 mutex_lock(&video->device_list_lock);
1186 list_add_tail(&data->entry, &video->video_device_list);
1187 mutex_unlock(&video->device_list_lock);
1188
1189 return status;
1190 }
1191
1192 /*
1193 * Arg:
1194 * video : video bus device
1195 *
1196 * Return:
1197 * none
1198 *
1199 * Enumerate the video device list of the video bus,
1200 * bind the ids with the corresponding video devices
1201 * under the video bus.
1202 */
1203
1204 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1205 {
1206 struct acpi_video_device *dev;
1207
1208 mutex_lock(&video->device_list_lock);
1209
1210 list_for_each_entry(dev, &video->video_device_list, entry)
1211 acpi_video_device_bind(video, dev);
1212
1213 mutex_unlock(&video->device_list_lock);
1214 }
1215
1216 /*
1217 * Arg:
1218 * video : video bus device
1219 * device : video output device under the video
1220 * bus
1221 *
1222 * Return:
1223 * none
1224 *
1225 * Bind the ids with the corresponding video devices
1226 * under the video bus.
1227 */
1228
1229 static void
1230 acpi_video_device_bind(struct acpi_video_bus *video,
1231 struct acpi_video_device *device)
1232 {
1233 struct acpi_video_enumerated_device *ids;
1234 int i;
1235
1236 for (i = 0; i < video->attached_count; i++) {
1237 ids = &video->attached_array[i];
1238 if (device->device_id == (ids->value.int_val & 0xffff)) {
1239 ids->bind_info = device;
1240 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1241 }
1242 }
1243 }
1244
1245 /*
1246 * Arg:
1247 * video : video bus device
1248 *
1249 * Return:
1250 * < 0 : error
1251 *
1252 * Call _DOD to enumerate all devices attached to display adapter
1253 *
1254 */
1255
1256 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1257 {
1258 int status;
1259 int count;
1260 int i;
1261 struct acpi_video_enumerated_device *active_list;
1262 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1263 union acpi_object *dod = NULL;
1264 union acpi_object *obj;
1265
1266 if (!video->cap._DOD)
1267 return AE_NOT_EXIST;
1268
1269 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1270 if (!ACPI_SUCCESS(status)) {
1271 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1272 return status;
1273 }
1274
1275 dod = buffer.pointer;
1276 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1277 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1278 status = -EFAULT;
1279 goto out;
1280 }
1281
1282 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1283 dod->package.count));
1284
1285 active_list = kcalloc(1 + dod->package.count,
1286 sizeof(struct acpi_video_enumerated_device),
1287 GFP_KERNEL);
1288 if (!active_list) {
1289 status = -ENOMEM;
1290 goto out;
1291 }
1292
1293 count = 0;
1294 for (i = 0; i < dod->package.count; i++) {
1295 obj = &dod->package.elements[i];
1296
1297 if (obj->type != ACPI_TYPE_INTEGER) {
1298 printk(KERN_ERR PREFIX
1299 "Invalid _DOD data in element %d\n", i);
1300 continue;
1301 }
1302
1303 active_list[count].value.int_val = obj->integer.value;
1304 active_list[count].bind_info = NULL;
1305 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1306 (int)obj->integer.value));
1307 count++;
1308 }
1309
1310 kfree(video->attached_array);
1311
1312 video->attached_array = active_list;
1313 video->attached_count = count;
1314
1315 out:
1316 kfree(buffer.pointer);
1317 return status;
1318 }
1319
1320 static int
1321 acpi_video_get_next_level(struct acpi_video_device *device,
1322 u32 level_current, u32 event)
1323 {
1324 int min, max, min_above, max_below, i, l, delta = 255;
1325 max = max_below = 0;
1326 min = min_above = 255;
1327 /* Find closest level to level_current */
1328 for (i = 2; i < device->brightness->count; i++) {
1329 l = device->brightness->levels[i];
1330 if (abs(l - level_current) < abs(delta)) {
1331 delta = l - level_current;
1332 if (!delta)
1333 break;
1334 }
1335 }
1336 /* Ajust level_current to closest available level */
1337 level_current += delta;
1338 for (i = 2; i < device->brightness->count; i++) {
1339 l = device->brightness->levels[i];
1340 if (l < min)
1341 min = l;
1342 if (l > max)
1343 max = l;
1344 if (l < min_above && l > level_current)
1345 min_above = l;
1346 if (l > max_below && l < level_current)
1347 max_below = l;
1348 }
1349
1350 switch (event) {
1351 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1352 return (level_current < max) ? min_above : min;
1353 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1354 return (level_current < max) ? min_above : max;
1355 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1356 return (level_current > min) ? max_below : min;
1357 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1358 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1359 return 0;
1360 default:
1361 return level_current;
1362 }
1363 }
1364
1365 static int
1366 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1367 {
1368 unsigned long long level_current, level_next;
1369 int result = -EINVAL;
1370
1371 /* no warning message if acpi_backlight=vendor is used */
1372 if (!acpi_video_backlight_support())
1373 return 0;
1374
1375 if (!device->brightness)
1376 goto out;
1377
1378 result = acpi_video_device_lcd_get_level_current(device,
1379 &level_current,
1380 false);
1381 if (result)
1382 goto out;
1383
1384 level_next = acpi_video_get_next_level(device, level_current, event);
1385
1386 result = acpi_video_device_lcd_set_level(device, level_next);
1387
1388 if (!result)
1389 backlight_force_update(device->backlight,
1390 BACKLIGHT_UPDATE_HOTKEY);
1391
1392 out:
1393 if (result)
1394 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1395
1396 return result;
1397 }
1398
1399 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1400 void **edid)
1401 {
1402 struct acpi_video_bus *video;
1403 struct acpi_video_device *video_device;
1404 union acpi_object *buffer = NULL;
1405 acpi_status status;
1406 int i, length;
1407
1408 if (!device || !acpi_driver_data(device))
1409 return -EINVAL;
1410
1411 video = acpi_driver_data(device);
1412
1413 for (i = 0; i < video->attached_count; i++) {
1414 video_device = video->attached_array[i].bind_info;
1415 length = 256;
1416
1417 if (!video_device)
1418 continue;
1419
1420 if (!video_device->cap._DDC)
1421 continue;
1422
1423 if (type) {
1424 switch (type) {
1425 case ACPI_VIDEO_DISPLAY_CRT:
1426 if (!video_device->flags.crt)
1427 continue;
1428 break;
1429 case ACPI_VIDEO_DISPLAY_TV:
1430 if (!video_device->flags.tvout)
1431 continue;
1432 break;
1433 case ACPI_VIDEO_DISPLAY_DVI:
1434 if (!video_device->flags.dvi)
1435 continue;
1436 break;
1437 case ACPI_VIDEO_DISPLAY_LCD:
1438 if (!video_device->flags.lcd)
1439 continue;
1440 break;
1441 }
1442 } else if (video_device->device_id != device_id) {
1443 continue;
1444 }
1445
1446 status = acpi_video_device_EDID(video_device, &buffer, length);
1447
1448 if (ACPI_FAILURE(status) || !buffer ||
1449 buffer->type != ACPI_TYPE_BUFFER) {
1450 length = 128;
1451 status = acpi_video_device_EDID(video_device, &buffer,
1452 length);
1453 if (ACPI_FAILURE(status) || !buffer ||
1454 buffer->type != ACPI_TYPE_BUFFER) {
1455 continue;
1456 }
1457 }
1458
1459 *edid = buffer->buffer.pointer;
1460 return length;
1461 }
1462
1463 return -ENODEV;
1464 }
1465 EXPORT_SYMBOL(acpi_video_get_edid);
1466
1467 static int
1468 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1469 struct acpi_device *device)
1470 {
1471 int status = 0;
1472 struct acpi_device *dev;
1473
1474 /*
1475 * There are systems where video module known to work fine regardless
1476 * of broken _DOD and ignoring returned value here doesn't cause
1477 * any issues later.
1478 */
1479 acpi_video_device_enumerate(video);
1480
1481 list_for_each_entry(dev, &device->children, node) {
1482
1483 status = acpi_video_bus_get_one_device(dev, video);
1484 if (status) {
1485 dev_err(&dev->dev, "Can't attach device\n");
1486 break;
1487 }
1488 }
1489 return status;
1490 }
1491
1492 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1493 {
1494 acpi_status status;
1495
1496 if (!device || !device->video)
1497 return -ENOENT;
1498
1499 if (device->flags.notify) {
1500 status = acpi_remove_notify_handler(device->dev->handle,
1501 ACPI_DEVICE_NOTIFY, acpi_video_device_notify);
1502 if (ACPI_FAILURE(status))
1503 dev_err(&device->dev->dev,
1504 "Can't remove video notify handler\n");
1505 }
1506
1507 if (device->backlight) {
1508 backlight_device_unregister(device->backlight);
1509 device->backlight = NULL;
1510 }
1511 if (device->cooling_dev) {
1512 sysfs_remove_link(&device->dev->dev.kobj,
1513 "thermal_cooling");
1514 sysfs_remove_link(&device->cooling_dev->device.kobj,
1515 "device");
1516 thermal_cooling_device_unregister(device->cooling_dev);
1517 device->cooling_dev = NULL;
1518 }
1519
1520 return 0;
1521 }
1522
1523 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1524 {
1525 int status;
1526 struct acpi_video_device *dev, *next;
1527
1528 mutex_lock(&video->device_list_lock);
1529
1530 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1531
1532 status = acpi_video_bus_put_one_device(dev);
1533 if (ACPI_FAILURE(status))
1534 printk(KERN_WARNING PREFIX
1535 "hhuuhhuu bug in acpi video driver.\n");
1536
1537 if (dev->brightness) {
1538 kfree(dev->brightness->levels);
1539 kfree(dev->brightness);
1540 }
1541 list_del(&dev->entry);
1542 kfree(dev);
1543 }
1544
1545 mutex_unlock(&video->device_list_lock);
1546
1547 return 0;
1548 }
1549
1550 /* acpi_video interface */
1551
1552 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1553 {
1554 return acpi_video_bus_DOS(video, 0, 0);
1555 }
1556
1557 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1558 {
1559 return acpi_video_bus_DOS(video, 0, 1);
1560 }
1561
1562 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1563 {
1564 struct acpi_video_bus *video = acpi_driver_data(device);
1565 struct input_dev *input;
1566 int keycode = 0;
1567
1568 if (!video)
1569 return;
1570
1571 input = video->input;
1572
1573 switch (event) {
1574 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1575 * most likely via hotkey. */
1576 acpi_bus_generate_proc_event(device, event, 0);
1577 keycode = KEY_SWITCHVIDEOMODE;
1578 break;
1579
1580 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1581 * connector. */
1582 acpi_video_device_enumerate(video);
1583 acpi_video_device_rebind(video);
1584 acpi_bus_generate_proc_event(device, event, 0);
1585 keycode = KEY_SWITCHVIDEOMODE;
1586 break;
1587
1588 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1589 acpi_bus_generate_proc_event(device, event, 0);
1590 keycode = KEY_SWITCHVIDEOMODE;
1591 break;
1592 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1593 acpi_bus_generate_proc_event(device, event, 0);
1594 keycode = KEY_VIDEO_NEXT;
1595 break;
1596 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1597 acpi_bus_generate_proc_event(device, event, 0);
1598 keycode = KEY_VIDEO_PREV;
1599 break;
1600
1601 default:
1602 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1603 "Unsupported event [0x%x]\n", event));
1604 break;
1605 }
1606
1607 if (acpi_notifier_call_chain(device, event, 0))
1608 /* Something vetoed the keypress. */
1609 keycode = 0;
1610
1611 if (keycode) {
1612 input_report_key(input, keycode, 1);
1613 input_sync(input);
1614 input_report_key(input, keycode, 0);
1615 input_sync(input);
1616 }
1617
1618 return;
1619 }
1620
1621 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1622 {
1623 struct acpi_video_device *video_device = data;
1624 struct acpi_device *device = NULL;
1625 struct acpi_video_bus *bus;
1626 struct input_dev *input;
1627 int keycode = 0;
1628
1629 if (!video_device)
1630 return;
1631
1632 device = video_device->dev;
1633 bus = video_device->video;
1634 input = bus->input;
1635
1636 switch (event) {
1637 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1638 if (brightness_switch_enabled)
1639 acpi_video_switch_brightness(video_device, event);
1640 acpi_bus_generate_proc_event(device, event, 0);
1641 keycode = KEY_BRIGHTNESS_CYCLE;
1642 break;
1643 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1644 if (brightness_switch_enabled)
1645 acpi_video_switch_brightness(video_device, event);
1646 acpi_bus_generate_proc_event(device, event, 0);
1647 keycode = KEY_BRIGHTNESSUP;
1648 break;
1649 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1650 if (brightness_switch_enabled)
1651 acpi_video_switch_brightness(video_device, event);
1652 acpi_bus_generate_proc_event(device, event, 0);
1653 keycode = KEY_BRIGHTNESSDOWN;
1654 break;
1655 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1656 if (brightness_switch_enabled)
1657 acpi_video_switch_brightness(video_device, event);
1658 acpi_bus_generate_proc_event(device, event, 0);
1659 keycode = KEY_BRIGHTNESS_ZERO;
1660 break;
1661 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1662 if (brightness_switch_enabled)
1663 acpi_video_switch_brightness(video_device, event);
1664 acpi_bus_generate_proc_event(device, event, 0);
1665 keycode = KEY_DISPLAY_OFF;
1666 break;
1667 default:
1668 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1669 "Unsupported event [0x%x]\n", event));
1670 break;
1671 }
1672
1673 acpi_notifier_call_chain(device, event, 0);
1674
1675 if (keycode) {
1676 input_report_key(input, keycode, 1);
1677 input_sync(input);
1678 input_report_key(input, keycode, 0);
1679 input_sync(input);
1680 }
1681
1682 return;
1683 }
1684
1685 static int acpi_video_resume(struct notifier_block *nb,
1686 unsigned long val, void *ign)
1687 {
1688 struct acpi_video_bus *video;
1689 struct acpi_video_device *video_device;
1690 int i;
1691
1692 switch (val) {
1693 case PM_HIBERNATION_PREPARE:
1694 case PM_SUSPEND_PREPARE:
1695 case PM_RESTORE_PREPARE:
1696 return NOTIFY_DONE;
1697 }
1698
1699 video = container_of(nb, struct acpi_video_bus, pm_nb);
1700
1701 dev_info(&video->device->dev, "Restoring backlight state\n");
1702
1703 for (i = 0; i < video->attached_count; i++) {
1704 video_device = video->attached_array[i].bind_info;
1705 if (video_device && video_device->backlight)
1706 acpi_video_set_brightness(video_device->backlight);
1707 }
1708
1709 return NOTIFY_OK;
1710 }
1711
1712 static acpi_status
1713 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1714 void **return_value)
1715 {
1716 struct acpi_device *device = context;
1717 struct acpi_device *sibling;
1718 int result;
1719
1720 if (handle == device->handle)
1721 return AE_CTRL_TERMINATE;
1722
1723 result = acpi_bus_get_device(handle, &sibling);
1724 if (result)
1725 return AE_OK;
1726
1727 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1728 return AE_ALREADY_EXISTS;
1729
1730 return AE_OK;
1731 }
1732
1733 static int instance;
1734
1735 static int acpi_video_bus_add(struct acpi_device *device)
1736 {
1737 struct acpi_video_bus *video;
1738 struct input_dev *input;
1739 int error;
1740 acpi_status status;
1741
1742 if (device->handler)
1743 return -EINVAL;
1744
1745 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1746 device->parent->handle, 1,
1747 acpi_video_bus_match, NULL,
1748 device, NULL);
1749 if (status == AE_ALREADY_EXISTS) {
1750 printk(KERN_WARNING FW_BUG
1751 "Duplicate ACPI video bus devices for the"
1752 " same VGA controller, please try module "
1753 "parameter \"video.allow_duplicates=1\""
1754 "if the current driver doesn't work.\n");
1755 if (!allow_duplicates)
1756 return -ENODEV;
1757 }
1758
1759 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1760 if (!video)
1761 return -ENOMEM;
1762
1763 /* a hack to fix the duplicate name "VID" problem on T61 */
1764 if (!strcmp(device->pnp.bus_id, "VID")) {
1765 if (instance)
1766 device->pnp.bus_id[3] = '0' + instance;
1767 instance ++;
1768 }
1769 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1770 if (!strcmp(device->pnp.bus_id, "VGA")) {
1771 if (instance)
1772 device->pnp.bus_id[3] = '0' + instance;
1773 instance++;
1774 }
1775
1776 video->device = device;
1777 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1778 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1779 device->driver_data = video;
1780
1781 acpi_video_bus_find_cap(video);
1782 error = acpi_video_bus_check(video);
1783 if (error)
1784 goto err_free_video;
1785
1786 mutex_init(&video->device_list_lock);
1787 INIT_LIST_HEAD(&video->video_device_list);
1788
1789 error = acpi_video_bus_get_devices(video, device);
1790 if (error)
1791 goto err_put_video;
1792
1793 video->input = input = input_allocate_device();
1794 if (!input) {
1795 error = -ENOMEM;
1796 goto err_put_video;
1797 }
1798
1799 error = acpi_video_bus_start_devices(video);
1800 if (error)
1801 goto err_free_input_dev;
1802
1803 snprintf(video->phys, sizeof(video->phys),
1804 "%s/video/input0", acpi_device_hid(video->device));
1805
1806 input->name = acpi_device_name(video->device);
1807 input->phys = video->phys;
1808 input->id.bustype = BUS_HOST;
1809 input->id.product = 0x06;
1810 input->dev.parent = &device->dev;
1811 input->evbit[0] = BIT(EV_KEY);
1812 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1813 set_bit(KEY_VIDEO_NEXT, input->keybit);
1814 set_bit(KEY_VIDEO_PREV, input->keybit);
1815 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1816 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1817 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1818 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1819 set_bit(KEY_DISPLAY_OFF, input->keybit);
1820
1821 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
1822 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1823 video->flags.multihead ? "yes" : "no",
1824 video->flags.rom ? "yes" : "no",
1825 video->flags.post ? "yes" : "no");
1826
1827 video->pm_nb.notifier_call = acpi_video_resume;
1828 video->pm_nb.priority = 0;
1829 error = register_pm_notifier(&video->pm_nb);
1830 if (error)
1831 goto err_stop_video;
1832
1833 error = input_register_device(input);
1834 if (error)
1835 goto err_unregister_pm_notifier;
1836
1837 return 0;
1838
1839 err_unregister_pm_notifier:
1840 unregister_pm_notifier(&video->pm_nb);
1841 err_stop_video:
1842 acpi_video_bus_stop_devices(video);
1843 err_free_input_dev:
1844 input_free_device(input);
1845 err_put_video:
1846 acpi_video_bus_put_devices(video);
1847 kfree(video->attached_array);
1848 err_free_video:
1849 kfree(video);
1850 device->driver_data = NULL;
1851
1852 return error;
1853 }
1854
1855 static int acpi_video_bus_remove(struct acpi_device *device)
1856 {
1857 struct acpi_video_bus *video = NULL;
1858
1859
1860 if (!device || !acpi_driver_data(device))
1861 return -EINVAL;
1862
1863 video = acpi_driver_data(device);
1864
1865 unregister_pm_notifier(&video->pm_nb);
1866
1867 acpi_video_bus_stop_devices(video);
1868 acpi_video_bus_put_devices(video);
1869
1870 input_unregister_device(video->input);
1871 kfree(video->attached_array);
1872 kfree(video);
1873
1874 return 0;
1875 }
1876
1877 static int __init is_i740(struct pci_dev *dev)
1878 {
1879 if (dev->device == 0x00D1)
1880 return 1;
1881 if (dev->device == 0x7000)
1882 return 1;
1883 return 0;
1884 }
1885
1886 static int __init intel_opregion_present(void)
1887 {
1888 int opregion = 0;
1889 struct pci_dev *dev = NULL;
1890 u32 address;
1891
1892 for_each_pci_dev(dev) {
1893 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1894 continue;
1895 if (dev->vendor != PCI_VENDOR_ID_INTEL)
1896 continue;
1897 /* We don't want to poke around undefined i740 registers */
1898 if (is_i740(dev))
1899 continue;
1900 pci_read_config_dword(dev, 0xfc, &address);
1901 if (!address)
1902 continue;
1903 opregion = 1;
1904 }
1905 return opregion;
1906 }
1907
1908 int acpi_video_register(void)
1909 {
1910 int result = 0;
1911 if (register_count) {
1912 /*
1913 * if the function of acpi_video_register is already called,
1914 * don't register the acpi_vide_bus again and return no error.
1915 */
1916 return 0;
1917 }
1918
1919 result = acpi_bus_register_driver(&acpi_video_bus);
1920 if (result < 0)
1921 return -ENODEV;
1922
1923 /*
1924 * When the acpi_video_bus is loaded successfully, increase
1925 * the counter reference.
1926 */
1927 register_count = 1;
1928
1929 return 0;
1930 }
1931 EXPORT_SYMBOL(acpi_video_register);
1932
1933 void acpi_video_unregister(void)
1934 {
1935 if (!register_count) {
1936 /*
1937 * If the acpi video bus is already unloaded, don't
1938 * unload it again and return directly.
1939 */
1940 return;
1941 }
1942 acpi_bus_unregister_driver(&acpi_video_bus);
1943
1944 register_count = 0;
1945
1946 return;
1947 }
1948 EXPORT_SYMBOL(acpi_video_unregister);
1949
1950 /*
1951 * This is kind of nasty. Hardware using Intel chipsets may require
1952 * the video opregion code to be run first in order to initialise
1953 * state before any ACPI video calls are made. To handle this we defer
1954 * registration of the video class until the opregion code has run.
1955 */
1956
1957 static int __init acpi_video_init(void)
1958 {
1959 /*
1960 * Let the module load even if ACPI is disabled (e.g. due to
1961 * a broken BIOS) so that i915.ko can still be loaded on such
1962 * old systems without an AcpiOpRegion.
1963 *
1964 * acpi_video_register() will report -ENODEV later as well due
1965 * to acpi_disabled when i915.ko tries to register itself afterwards.
1966 */
1967 if (acpi_disabled)
1968 return 0;
1969
1970 dmi_check_system(video_dmi_table);
1971
1972 if (intel_opregion_present())
1973 return 0;
1974
1975 return acpi_video_register();
1976 }
1977
1978 static void __exit acpi_video_exit(void)
1979 {
1980 acpi_video_unregister();
1981
1982 return;
1983 }
1984
1985 module_init(acpi_video_init);
1986 module_exit(acpi_video_exit);
kernel source for telekom puls (alcatel/mediatek)