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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
66ACPI_MODULE_NAME("video");
67
68MODULE_AUTHOR("Bruno Ducrot");
69MODULE_DESCRIPTION("ACPI Video Driver");
70MODULE_LICENSE("GPL");
71
72static int brightness_switch_enabled = 1;
73module_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 */
79static int allow_duplicates;
80module_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 */
86static int use_bios_initial_backlight = 1;
87module_param(use_bios_initial_backlight, bool, 0644);
88
89static int register_count = 0;
90static int acpi_video_bus_add(struct acpi_device *device);
91static int acpi_video_bus_remove(struct acpi_device *device, int type);
92static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
93
94static const struct acpi_device_id video_device_ids[] = {
95 {ACPI_VIDEO_HID, 0},
96 {"", 0},
97};
98MODULE_DEVICE_TABLE(acpi, video_device_ids);
99
100static 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
111struct 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
118struct 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
128struct 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
141struct 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
149struct 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
163struct 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 reserved:2;
171};
172
173struct acpi_video_device_cap {
174 u8 _ADR:1; /*Return the unique ID */
175 u8 _BCL:1; /*Query list of brightness control levels supported */
176 u8 _BCM:1; /*Set the brightness level */
177 u8 _BQC:1; /* Get current brightness level */
178 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
179 u8 _DDC:1; /*Return the EDID for this device */
180};
181
182struct acpi_video_brightness_flags {
183 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
184 u8 _BCL_reversed:1; /* _BCL package is in a reversed order*/
185 u8 _BCL_use_index:1; /* levels in _BCL are index values */
186 u8 _BCM_use_index:1; /* input of _BCM is an index value */
187 u8 _BQC_use_index:1; /* _BQC returns an index value */
188};
189
190struct acpi_video_device_brightness {
191 int curr;
192 int count;
193 int *levels;
194 struct acpi_video_brightness_flags flags;
195};
196
197struct acpi_video_device {
198 unsigned long device_id;
199 struct acpi_video_device_flags flags;
200 struct acpi_video_device_cap cap;
201 struct list_head entry;
202 struct acpi_video_bus *video;
203 struct acpi_device *dev;
204 struct acpi_video_device_brightness *brightness;
205 struct backlight_device *backlight;
206 struct thermal_cooling_device *cooling_dev;
207};
208
209static const char device_decode[][30] = {
210 "motherboard VGA device",
211 "PCI VGA device",
212 "AGP VGA device",
213 "UNKNOWN",
214};
215
216static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
217static void acpi_video_device_rebind(struct acpi_video_bus *video);
218static void acpi_video_device_bind(struct acpi_video_bus *video,
219 struct acpi_video_device *device);
220static int acpi_video_device_enumerate(struct acpi_video_bus *video);
221static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
222 int level);
223static int acpi_video_device_lcd_get_level_current(
224 struct acpi_video_device *device,
225 unsigned long long *level, int init);
226static int acpi_video_get_next_level(struct acpi_video_device *device,
227 u32 level_current, u32 event);
228static int acpi_video_switch_brightness(struct acpi_video_device *device,
229 int event);
230
231/*backlight device sysfs support*/
232static int acpi_video_get_brightness(struct backlight_device *bd)
233{
234 unsigned long long cur_level;
235 int i;
236 struct acpi_video_device *vd =
237 (struct acpi_video_device *)bl_get_data(bd);
238
239 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, 0))
240 return -EINVAL;
241 for (i = 2; i < vd->brightness->count; i++) {
242 if (vd->brightness->levels[i] == cur_level)
243 /* The first two entries are special - see page 575
244 of the ACPI spec 3.0 */
245 return i-2;
246 }
247 return 0;
248}
249
250static int acpi_video_set_brightness(struct backlight_device *bd)
251{
252 int request_level = bd->props.brightness + 2;
253 struct acpi_video_device *vd =
254 (struct acpi_video_device *)bl_get_data(bd);
255
256 return acpi_video_device_lcd_set_level(vd,
257 vd->brightness->levels[request_level]);
258}
259
260static const struct backlight_ops acpi_backlight_ops = {
261 .get_brightness = acpi_video_get_brightness,
262 .update_status = acpi_video_set_brightness,
263};
264
265/* thermal cooling device callbacks */
266static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
267 long *state)
268{
269 struct acpi_device *device = cooling_dev->devdata;
270 struct acpi_video_device *video = acpi_driver_data(device);
271
272 *state = video->brightness->count - 3;
273 return 0;
274}
275
276static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
277 long *state)
278{
279 struct acpi_device *device = cooling_dev->devdata;
280 struct acpi_video_device *video = acpi_driver_data(device);
281 unsigned long long level;
282 int offset;
283
284 if (acpi_video_device_lcd_get_level_current(video, &level, 0))
285 return -EINVAL;
286 for (offset = 2; offset < video->brightness->count; offset++)
287 if (level == video->brightness->levels[offset]) {
288 *state = video->brightness->count - offset - 1;
289 return 0;
290 }
291
292 return -EINVAL;
293}
294
295static int
296video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
297{
298 struct acpi_device *device = cooling_dev->devdata;
299 struct acpi_video_device *video = acpi_driver_data(device);
300 int level;
301
302 if ( state >= video->brightness->count - 2)
303 return -EINVAL;
304
305 state = video->brightness->count - state;
306 level = video->brightness->levels[state -1];
307 return acpi_video_device_lcd_set_level(video, level);
308}
309
310static const struct thermal_cooling_device_ops video_cooling_ops = {
311 .get_max_state = video_get_max_state,
312 .get_cur_state = video_get_cur_state,
313 .set_cur_state = video_set_cur_state,
314};
315
316/* --------------------------------------------------------------------------
317 Video Management
318 -------------------------------------------------------------------------- */
319
320static int
321acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
322 union acpi_object **levels)
323{
324 int status;
325 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
326 union acpi_object *obj;
327
328
329 *levels = NULL;
330
331 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
332 if (!ACPI_SUCCESS(status))
333 return status;
334 obj = (union acpi_object *)buffer.pointer;
335 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
336 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
337 status = -EFAULT;
338 goto err;
339 }
340
341 *levels = obj;
342
343 return 0;
344
345 err:
346 kfree(buffer.pointer);
347
348 return status;
349}
350
351static int
352acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
353{
354 int status;
355 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
356 struct acpi_object_list args = { 1, &arg0 };
357 int state;
358
359 arg0.integer.value = level;
360
361 status = acpi_evaluate_object(device->dev->handle, "_BCM",
362 &args, NULL);
363 if (ACPI_FAILURE(status)) {
364 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
365 return -EIO;
366 }
367
368 device->brightness->curr = level;
369 for (state = 2; state < device->brightness->count; state++)
370 if (level == device->brightness->levels[state]) {
371 if (device->backlight)
372 device->backlight->props.brightness = state - 2;
373 return 0;
374 }
375
376 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
377 return -EINVAL;
378}
379
380/*
381 * For some buggy _BQC methods, we need to add a constant value to
382 * the _BQC return value to get the actual current brightness level
383 */
384
385static int bqc_offset_aml_bug_workaround;
386static int __init video_set_bqc_offset(const struct dmi_system_id *d)
387{
388 bqc_offset_aml_bug_workaround = 9;
389 return 0;
390}
391
392static struct dmi_system_id video_dmi_table[] __initdata = {
393 /*
394 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
395 */
396 {
397 .callback = video_set_bqc_offset,
398 .ident = "Acer Aspire 5720",
399 .matches = {
400 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
401 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
402 },
403 },
404 {
405 .callback = video_set_bqc_offset,
406 .ident = "Acer Aspire 5710Z",
407 .matches = {
408 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
409 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
410 },
411 },
412 {
413 .callback = video_set_bqc_offset,
414 .ident = "eMachines E510",
415 .matches = {
416 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
417 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
418 },
419 },
420 {
421 .callback = video_set_bqc_offset,
422 .ident = "Acer Aspire 5315",
423 .matches = {
424 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
425 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
426 },
427 },
428 {
429 .callback = video_set_bqc_offset,
430 .ident = "Acer Aspire 7720",
431 .matches = {
432 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
433 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
434 },
435 },
436 {}
437};
438
439static int
440acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
441 unsigned long long *level, int init)
442{
443 acpi_status status = AE_OK;
444 int i;
445
446 if (device->cap._BQC || device->cap._BCQ) {
447 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
448
449 status = acpi_evaluate_integer(device->dev->handle, buf,
450 NULL, level);
451 if (ACPI_SUCCESS(status)) {
452 if (device->brightness->flags._BQC_use_index) {
453 if (device->brightness->flags._BCL_reversed)
454 *level = device->brightness->count
455 - 3 - (*level);
456 *level = device->brightness->levels[*level + 2];
457
458 }
459 *level += bqc_offset_aml_bug_workaround;
460 for (i = 2; i < device->brightness->count; i++)
461 if (device->brightness->levels[i] == *level) {
462 device->brightness->curr = *level;
463 return 0;
464 }
465 if (!init) {
466 /*
467 * BQC returned an invalid level.
468 * Stop using it.
469 */
470 ACPI_WARNING((AE_INFO,
471 "%s returned an invalid level",
472 buf));
473 device->cap._BQC = device->cap._BCQ = 0;
474 }
475 } else {
476 /* Fixme:
477 * should we return an error or ignore this failure?
478 * dev->brightness->curr is a cached value which stores
479 * the correct current backlight level in most cases.
480 * ACPI video backlight still works w/ buggy _BQC.
481 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
482 */
483 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
484 device->cap._BQC = device->cap._BCQ = 0;
485 }
486 }
487
488 *level = device->brightness->curr;
489 return 0;
490}
491
492static int
493acpi_video_device_EDID(struct acpi_video_device *device,
494 union acpi_object **edid, ssize_t length)
495{
496 int status;
497 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
498 union acpi_object *obj;
499 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
500 struct acpi_object_list args = { 1, &arg0 };
501
502
503 *edid = NULL;
504
505 if (!device)
506 return -ENODEV;
507 if (length == 128)
508 arg0.integer.value = 1;
509 else if (length == 256)
510 arg0.integer.value = 2;
511 else
512 return -EINVAL;
513
514 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
515 if (ACPI_FAILURE(status))
516 return -ENODEV;
517
518 obj = buffer.pointer;
519
520 if (obj && obj->type == ACPI_TYPE_BUFFER)
521 *edid = obj;
522 else {
523 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
524 status = -EFAULT;
525 kfree(obj);
526 }
527
528 return status;
529}
530
531/* bus */
532
533/*
534 * Arg:
535 * video : video bus device pointer
536 * bios_flag :
537 * 0. The system BIOS should NOT automatically switch(toggle)
538 * the active display output.
539 * 1. The system BIOS should automatically switch (toggle) the
540 * active display output. No switch event.
541 * 2. The _DGS value should be locked.
542 * 3. The system BIOS should not automatically switch (toggle) the
543 * active display output, but instead generate the display switch
544 * event notify code.
545 * lcd_flag :
546 * 0. The system BIOS should automatically control the brightness level
547 * of the LCD when the power changes from AC to DC
548 * 1. The system BIOS should NOT automatically control the brightness
549 * level of the LCD when the power changes from AC to DC.
550 * Return Value:
551 * -1 wrong arg.
552 */
553
554static int
555acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
556{
557 u64 status = 0;
558 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
559 struct acpi_object_list args = { 1, &arg0 };
560
561
562 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
563 status = -1;
564 goto Failed;
565 }
566 arg0.integer.value = (lcd_flag << 2) | bios_flag;
567 video->dos_setting = arg0.integer.value;
568 acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
569
570 Failed:
571 return status;
572}
573
574/*
575 * Simple comparison function used to sort backlight levels.
576 */
577
578static int
579acpi_video_cmp_level(const void *a, const void *b)
580{
581 return *(int *)a - *(int *)b;
582}
583
584/*
585 * Arg:
586 * device : video output device (LCD, CRT, ..)
587 *
588 * Return Value:
589 * Maximum brightness level
590 *
591 * Allocate and initialize device->brightness.
592 */
593
594static int
595acpi_video_init_brightness(struct acpi_video_device *device)
596{
597 union acpi_object *obj = NULL;
598 int i, max_level = 0, count = 0, level_ac_battery = 0;
599 unsigned long long level, level_old;
600 union acpi_object *o;
601 struct acpi_video_device_brightness *br = NULL;
602 int result = -EINVAL;
603
604 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
605 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
606 "LCD brightness level\n"));
607 goto out;
608 }
609
610 if (obj->package.count < 2)
611 goto out;
612
613 br = kzalloc(sizeof(*br), GFP_KERNEL);
614 if (!br) {
615 printk(KERN_ERR "can't allocate memory\n");
616 result = -ENOMEM;
617 goto out;
618 }
619
620 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
621 GFP_KERNEL);
622 if (!br->levels) {
623 result = -ENOMEM;
624 goto out_free;
625 }
626
627 for (i = 0; i < obj->package.count; i++) {
628 o = (union acpi_object *)&obj->package.elements[i];
629 if (o->type != ACPI_TYPE_INTEGER) {
630 printk(KERN_ERR PREFIX "Invalid data\n");
631 continue;
632 }
633 br->levels[count] = (u32) o->integer.value;
634
635 if (br->levels[count] > max_level)
636 max_level = br->levels[count];
637 count++;
638 }
639
640 /*
641 * some buggy BIOS don't export the levels
642 * when machine is on AC/Battery in _BCL package.
643 * In this case, the first two elements in _BCL packages
644 * are also supported brightness levels that OS should take care of.
645 */
646 for (i = 2; i < count; i++) {
647 if (br->levels[i] == br->levels[0])
648 level_ac_battery++;
649 if (br->levels[i] == br->levels[1])
650 level_ac_battery++;
651 }
652
653 if (level_ac_battery < 2) {
654 level_ac_battery = 2 - level_ac_battery;
655 br->flags._BCL_no_ac_battery_levels = 1;
656 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
657 br->levels[i] = br->levels[i - level_ac_battery];
658 count += level_ac_battery;
659 } else if (level_ac_battery > 2)
660 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
661
662 /* Check if the _BCL package is in a reversed order */
663 if (max_level == br->levels[2]) {
664 br->flags._BCL_reversed = 1;
665 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
666 acpi_video_cmp_level, NULL);
667 } else if (max_level != br->levels[count - 1])
668 ACPI_ERROR((AE_INFO,
669 "Found unordered _BCL package\n"));
670
671 br->count = count;
672 device->brightness = br;
673
674 /* Check the input/output of _BQC/_BCL/_BCM */
675 if ((max_level < 100) && (max_level <= (count - 2)))
676 br->flags._BCL_use_index = 1;
677
678 /*
679 * _BCM is always consistent with _BCL,
680 * at least for all the laptops we have ever seen.
681 */
682 br->flags._BCM_use_index = br->flags._BCL_use_index;
683
684 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
685 br->curr = level = max_level;
686
687 if (!device->cap._BQC)
688 goto set_level;
689
690 result = acpi_video_device_lcd_get_level_current(device, &level_old, 1);
691 if (result)
692 goto out_free_levels;
693
694 /*
695 * Set the level to maximum and check if _BQC uses indexed value
696 */
697 result = acpi_video_device_lcd_set_level(device, max_level);
698 if (result)
699 goto out_free_levels;
700
701 result = acpi_video_device_lcd_get_level_current(device, &level, 0);
702 if (result)
703 goto out_free_levels;
704
705 br->flags._BQC_use_index = (level == max_level ? 0 : 1);
706
707 if (!br->flags._BQC_use_index) {
708 /*
709 * Set the backlight to the initial state.
710 * On some buggy laptops, _BQC returns an uninitialized value
711 * when invoked for the first time, i.e. level_old is invalid.
712 * set the backlight to max_level in this case
713 */
714 if (use_bios_initial_backlight) {
715 for (i = 2; i < br->count; i++)
716 if (level_old == br->levels[i])
717 level = level_old;
718 }
719 goto set_level;
720 }
721
722 if (br->flags._BCL_reversed)
723 level_old = (br->count - 1) - level_old;
724 level = br->levels[level_old];
725
726set_level:
727 result = acpi_video_device_lcd_set_level(device, level);
728 if (result)
729 goto out_free_levels;
730
731 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
732 "found %d brightness levels\n", count - 2));
733 kfree(obj);
734 return result;
735
736out_free_levels:
737 kfree(br->levels);
738out_free:
739 kfree(br);
740out:
741 device->brightness = NULL;
742 kfree(obj);
743 return result;
744}
745
746/*
747 * Arg:
748 * device : video output device (LCD, CRT, ..)
749 *
750 * Return Value:
751 * None
752 *
753 * Find out all required AML methods defined under the output
754 * device.
755 */
756
757static void acpi_video_device_find_cap(struct acpi_video_device *device)
758{
759 acpi_handle h_dummy1;
760
761 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
762 device->cap._ADR = 1;
763 }
764 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
765 device->cap._BCL = 1;
766 }
767 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
768 device->cap._BCM = 1;
769 }
770 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
771 device->cap._BQC = 1;
772 else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
773 &h_dummy1))) {
774 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
775 device->cap._BCQ = 1;
776 }
777
778 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
779 device->cap._DDC = 1;
780 }
781
782 if (acpi_video_backlight_support()) {
783 struct backlight_properties props;
784 struct pci_dev *pdev;
785 acpi_handle acpi_parent;
786 struct device *parent = NULL;
787 int result;
788 static int count = 0;
789 char *name;
790
791 result = acpi_video_init_brightness(device);
792 if (result)
793 return;
794 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
795 if (!name)
796 return;
797 count++;
798
799 acpi_get_parent(device->dev->handle, &acpi_parent);
800
801 pdev = acpi_get_pci_dev(acpi_parent);
802 if (pdev) {
803 parent = &pdev->dev;
804 pci_dev_put(pdev);
805 }
806
807 memset(&props, 0, sizeof(struct backlight_properties));
808 props.type = BACKLIGHT_FIRMWARE;
809 props.max_brightness = device->brightness->count - 3;
810 device->backlight = backlight_device_register(name,
811 parent,
812 device,
813 &acpi_backlight_ops,
814 &props);
815 kfree(name);
816 if (IS_ERR(device->backlight))
817 return;
818
819 /*
820 * Save current brightness level in case we have to restore it
821 * before acpi_video_device_lcd_set_level() is called next time.
822 */
823 device->backlight->props.brightness =
824 acpi_video_get_brightness(device->backlight);
825
826 device->cooling_dev = thermal_cooling_device_register("LCD",
827 device->dev, &video_cooling_ops);
828 if (IS_ERR(device->cooling_dev)) {
829 /*
830 * Set cooling_dev to NULL so we don't crash trying to
831 * free it.
832 * Also, why the hell we are returning early and
833 * not attempt to register video output if cooling
834 * device registration failed?
835 * -- dtor
836 */
837 device->cooling_dev = NULL;
838 return;
839 }
840
841 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
842 device->cooling_dev->id);
843 result = sysfs_create_link(&device->dev->dev.kobj,
844 &device->cooling_dev->device.kobj,
845 "thermal_cooling");
846 if (result)
847 printk(KERN_ERR PREFIX "Create sysfs link\n");
848 result = sysfs_create_link(&device->cooling_dev->device.kobj,
849 &device->dev->dev.kobj, "device");
850 if (result)
851 printk(KERN_ERR PREFIX "Create sysfs link\n");
852
853 }
854}
855
856/*
857 * Arg:
858 * device : video output device (VGA)
859 *
860 * Return Value:
861 * None
862 *
863 * Find out all required AML methods defined under the video bus device.
864 */
865
866static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
867{
868 acpi_handle h_dummy1;
869
870 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
871 video->cap._DOS = 1;
872 }
873 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
874 video->cap._DOD = 1;
875 }
876 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
877 video->cap._ROM = 1;
878 }
879 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
880 video->cap._GPD = 1;
881 }
882 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
883 video->cap._SPD = 1;
884 }
885 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
886 video->cap._VPO = 1;
887 }
888}
889
890/*
891 * Check whether the video bus device has required AML method to
892 * support the desired features
893 */
894
895static int acpi_video_bus_check(struct acpi_video_bus *video)
896{
897 acpi_status status = -ENOENT;
898 struct pci_dev *dev;
899
900 if (!video)
901 return -EINVAL;
902
903 dev = acpi_get_pci_dev(video->device->handle);
904 if (!dev)
905 return -ENODEV;
906 pci_dev_put(dev);
907
908 /* Since there is no HID, CID and so on for VGA driver, we have
909 * to check well known required nodes.
910 */
911
912 /* Does this device support video switching? */
913 if (video->cap._DOS || video->cap._DOD) {
914 if (!video->cap._DOS) {
915 printk(KERN_WARNING FW_BUG
916 "ACPI(%s) defines _DOD but not _DOS\n",
917 acpi_device_bid(video->device));
918 }
919 video->flags.multihead = 1;
920 status = 0;
921 }
922
923 /* Does this device support retrieving a video ROM? */
924 if (video->cap._ROM) {
925 video->flags.rom = 1;
926 status = 0;
927 }
928
929 /* Does this device support configuring which video device to POST? */
930 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
931 video->flags.post = 1;
932 status = 0;
933 }
934
935 return status;
936}
937
938/* --------------------------------------------------------------------------
939 Driver Interface
940 -------------------------------------------------------------------------- */
941
942/* device interface */
943static struct acpi_video_device_attrib*
944acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
945{
946 struct acpi_video_enumerated_device *ids;
947 int i;
948
949 for (i = 0; i < video->attached_count; i++) {
950 ids = &video->attached_array[i];
951 if ((ids->value.int_val & 0xffff) == device_id)
952 return &ids->value.attrib;
953 }
954
955 return NULL;
956}
957
958static int
959acpi_video_get_device_type(struct acpi_video_bus *video,
960 unsigned long device_id)
961{
962 struct acpi_video_enumerated_device *ids;
963 int i;
964
965 for (i = 0; i < video->attached_count; i++) {
966 ids = &video->attached_array[i];
967 if ((ids->value.int_val & 0xffff) == device_id)
968 return ids->value.int_val;
969 }
970
971 return 0;
972}
973
974static int
975acpi_video_bus_get_one_device(struct acpi_device *device,
976 struct acpi_video_bus *video)
977{
978 unsigned long long device_id;
979 int status, device_type;
980 struct acpi_video_device *data;
981 struct acpi_video_device_attrib* attribute;
982
983 if (!device || !video)
984 return -EINVAL;
985
986 status =
987 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
988 if (ACPI_SUCCESS(status)) {
989
990 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
991 if (!data)
992 return -ENOMEM;
993
994 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
995 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
996 device->driver_data = data;
997
998 data->device_id = device_id;
999 data->video = video;
1000 data->dev = device;
1001
1002 attribute = acpi_video_get_device_attr(video, device_id);
1003
1004 if((attribute != NULL) && attribute->device_id_scheme) {
1005 switch (attribute->display_type) {
1006 case ACPI_VIDEO_DISPLAY_CRT:
1007 data->flags.crt = 1;
1008 break;
1009 case ACPI_VIDEO_DISPLAY_TV:
1010 data->flags.tvout = 1;
1011 break;
1012 case ACPI_VIDEO_DISPLAY_DVI:
1013 data->flags.dvi = 1;
1014 break;
1015 case ACPI_VIDEO_DISPLAY_LCD:
1016 data->flags.lcd = 1;
1017 break;
1018 default:
1019 data->flags.unknown = 1;
1020 break;
1021 }
1022 if(attribute->bios_can_detect)
1023 data->flags.bios = 1;
1024 } else {
1025 /* Check for legacy IDs */
1026 device_type = acpi_video_get_device_type(video,
1027 device_id);
1028 /* Ignore bits 16 and 18-20 */
1029 switch (device_type & 0xffe2ffff) {
1030 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1031 data->flags.crt = 1;
1032 break;
1033 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1034 data->flags.lcd = 1;
1035 break;
1036 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1037 data->flags.tvout = 1;
1038 break;
1039 default:
1040 data->flags.unknown = 1;
1041 }
1042 }
1043
1044 acpi_video_device_bind(video, data);
1045 acpi_video_device_find_cap(data);
1046
1047 status = acpi_install_notify_handler(device->handle,
1048 ACPI_DEVICE_NOTIFY,
1049 acpi_video_device_notify,
1050 data);
1051 if (ACPI_FAILURE(status)) {
1052 printk(KERN_ERR PREFIX
1053 "Error installing notify handler\n");
1054 if(data->brightness)
1055 kfree(data->brightness->levels);
1056 kfree(data->brightness);
1057 kfree(data);
1058 return -ENODEV;
1059 }
1060
1061 mutex_lock(&video->device_list_lock);
1062 list_add_tail(&data->entry, &video->video_device_list);
1063 mutex_unlock(&video->device_list_lock);
1064
1065 return 0;
1066 }
1067
1068 return -ENOENT;
1069}
1070
1071/*
1072 * Arg:
1073 * video : video bus device
1074 *
1075 * Return:
1076 * none
1077 *
1078 * Enumerate the video device list of the video bus,
1079 * bind the ids with the corresponding video devices
1080 * under the video bus.
1081 */
1082
1083static void acpi_video_device_rebind(struct acpi_video_bus *video)
1084{
1085 struct acpi_video_device *dev;
1086
1087 mutex_lock(&video->device_list_lock);
1088
1089 list_for_each_entry(dev, &video->video_device_list, entry)
1090 acpi_video_device_bind(video, dev);
1091
1092 mutex_unlock(&video->device_list_lock);
1093}
1094
1095/*
1096 * Arg:
1097 * video : video bus device
1098 * device : video output device under the video
1099 * bus
1100 *
1101 * Return:
1102 * none
1103 *
1104 * Bind the ids with the corresponding video devices
1105 * under the video bus.
1106 */
1107
1108static void
1109acpi_video_device_bind(struct acpi_video_bus *video,
1110 struct acpi_video_device *device)
1111{
1112 struct acpi_video_enumerated_device *ids;
1113 int i;
1114
1115 for (i = 0; i < video->attached_count; i++) {
1116 ids = &video->attached_array[i];
1117 if (device->device_id == (ids->value.int_val & 0xffff)) {
1118 ids->bind_info = device;
1119 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1120 }
1121 }
1122}
1123
1124/*
1125 * Arg:
1126 * video : video bus device
1127 *
1128 * Return:
1129 * < 0 : error
1130 *
1131 * Call _DOD to enumerate all devices attached to display adapter
1132 *
1133 */
1134
1135static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1136{
1137 int status;
1138 int count;
1139 int i;
1140 struct acpi_video_enumerated_device *active_list;
1141 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1142 union acpi_object *dod = NULL;
1143 union acpi_object *obj;
1144
1145 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1146 if (!ACPI_SUCCESS(status)) {
1147 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1148 return status;
1149 }
1150
1151 dod = buffer.pointer;
1152 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1153 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1154 status = -EFAULT;
1155 goto out;
1156 }
1157
1158 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1159 dod->package.count));
1160
1161 active_list = kcalloc(1 + dod->package.count,
1162 sizeof(struct acpi_video_enumerated_device),
1163 GFP_KERNEL);
1164 if (!active_list) {
1165 status = -ENOMEM;
1166 goto out;
1167 }
1168
1169 count = 0;
1170 for (i = 0; i < dod->package.count; i++) {
1171 obj = &dod->package.elements[i];
1172
1173 if (obj->type != ACPI_TYPE_INTEGER) {
1174 printk(KERN_ERR PREFIX
1175 "Invalid _DOD data in element %d\n", i);
1176 continue;
1177 }
1178
1179 active_list[count].value.int_val = obj->integer.value;
1180 active_list[count].bind_info = NULL;
1181 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1182 (int)obj->integer.value));
1183 count++;
1184 }
1185
1186 kfree(video->attached_array);
1187
1188 video->attached_array = active_list;
1189 video->attached_count = count;
1190
1191 out:
1192 kfree(buffer.pointer);
1193 return status;
1194}
1195
1196static int
1197acpi_video_get_next_level(struct acpi_video_device *device,
1198 u32 level_current, u32 event)
1199{
1200 int min, max, min_above, max_below, i, l, delta = 255;
1201 max = max_below = 0;
1202 min = min_above = 255;
1203 /* Find closest level to level_current */
1204 for (i = 2; i < device->brightness->count; i++) {
1205 l = device->brightness->levels[i];
1206 if (abs(l - level_current) < abs(delta)) {
1207 delta = l - level_current;
1208 if (!delta)
1209 break;
1210 }
1211 }
1212 /* Ajust level_current to closest available level */
1213 level_current += delta;
1214 for (i = 2; i < device->brightness->count; i++) {
1215 l = device->brightness->levels[i];
1216 if (l < min)
1217 min = l;
1218 if (l > max)
1219 max = l;
1220 if (l < min_above && l > level_current)
1221 min_above = l;
1222 if (l > max_below && l < level_current)
1223 max_below = l;
1224 }
1225
1226 switch (event) {
1227 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1228 return (level_current < max) ? min_above : min;
1229 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1230 return (level_current < max) ? min_above : max;
1231 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1232 return (level_current > min) ? max_below : min;
1233 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1234 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1235 return 0;
1236 default:
1237 return level_current;
1238 }
1239}
1240
1241static int
1242acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1243{
1244 unsigned long long level_current, level_next;
1245 int result = -EINVAL;
1246
1247 /* no warning message if acpi_backlight=vendor is used */
1248 if (!acpi_video_backlight_support())
1249 return 0;
1250
1251 if (!device->brightness)
1252 goto out;
1253
1254 result = acpi_video_device_lcd_get_level_current(device,
1255 &level_current, 0);
1256 if (result)
1257 goto out;
1258
1259 level_next = acpi_video_get_next_level(device, level_current, event);
1260
1261 result = acpi_video_device_lcd_set_level(device, level_next);
1262
1263 if (!result)
1264 backlight_force_update(device->backlight,
1265 BACKLIGHT_UPDATE_HOTKEY);
1266
1267out:
1268 if (result)
1269 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1270
1271 return result;
1272}
1273
1274int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1275 void **edid)
1276{
1277 struct acpi_video_bus *video;
1278 struct acpi_video_device *video_device;
1279 union acpi_object *buffer = NULL;
1280 acpi_status status;
1281 int i, length;
1282
1283 if (!device || !acpi_driver_data(device))
1284 return -EINVAL;
1285
1286 video = acpi_driver_data(device);
1287
1288 for (i = 0; i < video->attached_count; i++) {
1289 video_device = video->attached_array[i].bind_info;
1290 length = 256;
1291
1292 if (!video_device)
1293 continue;
1294
1295 if (!video_device->cap._DDC)
1296 continue;
1297
1298 if (type) {
1299 switch (type) {
1300 case ACPI_VIDEO_DISPLAY_CRT:
1301 if (!video_device->flags.crt)
1302 continue;
1303 break;
1304 case ACPI_VIDEO_DISPLAY_TV:
1305 if (!video_device->flags.tvout)
1306 continue;
1307 break;
1308 case ACPI_VIDEO_DISPLAY_DVI:
1309 if (!video_device->flags.dvi)
1310 continue;
1311 break;
1312 case ACPI_VIDEO_DISPLAY_LCD:
1313 if (!video_device->flags.lcd)
1314 continue;
1315 break;
1316 }
1317 } else if (video_device->device_id != device_id) {
1318 continue;
1319 }
1320
1321 status = acpi_video_device_EDID(video_device, &buffer, length);
1322
1323 if (ACPI_FAILURE(status) || !buffer ||
1324 buffer->type != ACPI_TYPE_BUFFER) {
1325 length = 128;
1326 status = acpi_video_device_EDID(video_device, &buffer,
1327 length);
1328 if (ACPI_FAILURE(status) || !buffer ||
1329 buffer->type != ACPI_TYPE_BUFFER) {
1330 continue;
1331 }
1332 }
1333
1334 *edid = buffer->buffer.pointer;
1335 return length;
1336 }
1337
1338 return -ENODEV;
1339}
1340EXPORT_SYMBOL(acpi_video_get_edid);
1341
1342static int
1343acpi_video_bus_get_devices(struct acpi_video_bus *video,
1344 struct acpi_device *device)
1345{
1346 int status = 0;
1347 struct acpi_device *dev;
1348
1349 acpi_video_device_enumerate(video);
1350
1351 list_for_each_entry(dev, &device->children, node) {
1352
1353 status = acpi_video_bus_get_one_device(dev, video);
1354 if (ACPI_FAILURE(status)) {
1355 printk(KERN_WARNING PREFIX
1356 "Can't attach device\n");
1357 continue;
1358 }
1359 }
1360 return status;
1361}
1362
1363static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1364{
1365 acpi_status status;
1366
1367 if (!device || !device->video)
1368 return -ENOENT;
1369
1370 status = acpi_remove_notify_handler(device->dev->handle,
1371 ACPI_DEVICE_NOTIFY,
1372 acpi_video_device_notify);
1373 if (ACPI_FAILURE(status)) {
1374 printk(KERN_WARNING PREFIX
1375 "Can't remove video notify handler\n");
1376 }
1377 if (device->backlight) {
1378 backlight_device_unregister(device->backlight);
1379 device->backlight = NULL;
1380 }
1381 if (device->cooling_dev) {
1382 sysfs_remove_link(&device->dev->dev.kobj,
1383 "thermal_cooling");
1384 sysfs_remove_link(&device->cooling_dev->device.kobj,
1385 "device");
1386 thermal_cooling_device_unregister(device->cooling_dev);
1387 device->cooling_dev = NULL;
1388 }
1389
1390 return 0;
1391}
1392
1393static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1394{
1395 int status;
1396 struct acpi_video_device *dev, *next;
1397
1398 mutex_lock(&video->device_list_lock);
1399
1400 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1401
1402 status = acpi_video_bus_put_one_device(dev);
1403 if (ACPI_FAILURE(status))
1404 printk(KERN_WARNING PREFIX
1405 "hhuuhhuu bug in acpi video driver.\n");
1406
1407 if (dev->brightness) {
1408 kfree(dev->brightness->levels);
1409 kfree(dev->brightness);
1410 }
1411 list_del(&dev->entry);
1412 kfree(dev);
1413 }
1414
1415 mutex_unlock(&video->device_list_lock);
1416
1417 return 0;
1418}
1419
1420/* acpi_video interface */
1421
1422static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1423{
1424 return acpi_video_bus_DOS(video, 0, 0);
1425}
1426
1427static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1428{
1429 return acpi_video_bus_DOS(video, 0, 1);
1430}
1431
1432static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1433{
1434 struct acpi_video_bus *video = acpi_driver_data(device);
1435 struct input_dev *input;
1436 int keycode = 0;
1437
1438 if (!video)
1439 return;
1440
1441 input = video->input;
1442
1443 switch (event) {
1444 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1445 * most likely via hotkey. */
1446 acpi_bus_generate_proc_event(device, event, 0);
1447 if (!acpi_notifier_call_chain(device, event, 0))
1448 keycode = KEY_SWITCHVIDEOMODE;
1449 break;
1450
1451 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1452 * connector. */
1453 acpi_video_device_enumerate(video);
1454 acpi_video_device_rebind(video);
1455 acpi_bus_generate_proc_event(device, event, 0);
1456 keycode = KEY_SWITCHVIDEOMODE;
1457 break;
1458
1459 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1460 acpi_bus_generate_proc_event(device, event, 0);
1461 keycode = KEY_SWITCHVIDEOMODE;
1462 break;
1463 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1464 acpi_bus_generate_proc_event(device, event, 0);
1465 keycode = KEY_VIDEO_NEXT;
1466 break;
1467 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1468 acpi_bus_generate_proc_event(device, event, 0);
1469 keycode = KEY_VIDEO_PREV;
1470 break;
1471
1472 default:
1473 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1474 "Unsupported event [0x%x]\n", event));
1475 break;
1476 }
1477
1478 if (event != ACPI_VIDEO_NOTIFY_SWITCH)
1479 acpi_notifier_call_chain(device, event, 0);
1480
1481 if (keycode) {
1482 input_report_key(input, keycode, 1);
1483 input_sync(input);
1484 input_report_key(input, keycode, 0);
1485 input_sync(input);
1486 }
1487
1488 return;
1489}
1490
1491static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1492{
1493 struct acpi_video_device *video_device = data;
1494 struct acpi_device *device = NULL;
1495 struct acpi_video_bus *bus;
1496 struct input_dev *input;
1497 int keycode = 0;
1498
1499 if (!video_device)
1500 return;
1501
1502 device = video_device->dev;
1503 bus = video_device->video;
1504 input = bus->input;
1505
1506 switch (event) {
1507 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1508 if (brightness_switch_enabled)
1509 acpi_video_switch_brightness(video_device, event);
1510 acpi_bus_generate_proc_event(device, event, 0);
1511 keycode = KEY_BRIGHTNESS_CYCLE;
1512 break;
1513 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1514 if (brightness_switch_enabled)
1515 acpi_video_switch_brightness(video_device, event);
1516 acpi_bus_generate_proc_event(device, event, 0);
1517 keycode = KEY_BRIGHTNESSUP;
1518 break;
1519 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1520 if (brightness_switch_enabled)
1521 acpi_video_switch_brightness(video_device, event);
1522 acpi_bus_generate_proc_event(device, event, 0);
1523 keycode = KEY_BRIGHTNESSDOWN;
1524 break;
1525 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1526 if (brightness_switch_enabled)
1527 acpi_video_switch_brightness(video_device, event);
1528 acpi_bus_generate_proc_event(device, event, 0);
1529 keycode = KEY_BRIGHTNESS_ZERO;
1530 break;
1531 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1532 if (brightness_switch_enabled)
1533 acpi_video_switch_brightness(video_device, event);
1534 acpi_bus_generate_proc_event(device, event, 0);
1535 keycode = KEY_DISPLAY_OFF;
1536 break;
1537 default:
1538 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1539 "Unsupported event [0x%x]\n", event));
1540 break;
1541 }
1542
1543 acpi_notifier_call_chain(device, event, 0);
1544
1545 if (keycode) {
1546 input_report_key(input, keycode, 1);
1547 input_sync(input);
1548 input_report_key(input, keycode, 0);
1549 input_sync(input);
1550 }
1551
1552 return;
1553}
1554
1555static int acpi_video_resume(struct notifier_block *nb,
1556 unsigned long val, void *ign)
1557{
1558 struct acpi_video_bus *video;
1559 struct acpi_video_device *video_device;
1560 int i;
1561
1562 switch (val) {
1563 case PM_HIBERNATION_PREPARE:
1564 case PM_SUSPEND_PREPARE:
1565 case PM_RESTORE_PREPARE:
1566 return NOTIFY_DONE;
1567 }
1568
1569 video = container_of(nb, struct acpi_video_bus, pm_nb);
1570
1571 dev_info(&video->device->dev, "Restoring backlight state\n");
1572
1573 for (i = 0; i < video->attached_count; i++) {
1574 video_device = video->attached_array[i].bind_info;
1575 if (video_device && video_device->backlight)
1576 acpi_video_set_brightness(video_device->backlight);
1577 }
1578
1579 return NOTIFY_OK;
1580}
1581
1582static acpi_status
1583acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1584 void **return_value)
1585{
1586 struct acpi_device *device = context;
1587 struct acpi_device *sibling;
1588 int result;
1589
1590 if (handle == device->handle)
1591 return AE_CTRL_TERMINATE;
1592
1593 result = acpi_bus_get_device(handle, &sibling);
1594 if (result)
1595 return AE_OK;
1596
1597 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1598 return AE_ALREADY_EXISTS;
1599
1600 return AE_OK;
1601}
1602
1603static int instance;
1604
1605static int acpi_video_bus_add(struct acpi_device *device)
1606{
1607 struct acpi_video_bus *video;
1608 struct input_dev *input;
1609 int error;
1610 acpi_status status;
1611
1612 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1613 device->parent->handle, 1,
1614 acpi_video_bus_match, NULL,
1615 device, NULL);
1616 if (status == AE_ALREADY_EXISTS) {
1617 printk(KERN_WARNING FW_BUG
1618 "Duplicate ACPI video bus devices for the"
1619 " same VGA controller, please try module "
1620 "parameter \"video.allow_duplicates=1\""
1621 "if the current driver doesn't work.\n");
1622 if (!allow_duplicates)
1623 return -ENODEV;
1624 }
1625
1626 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1627 if (!video)
1628 return -ENOMEM;
1629
1630 /* a hack to fix the duplicate name "VID" problem on T61 */
1631 if (!strcmp(device->pnp.bus_id, "VID")) {
1632 if (instance)
1633 device->pnp.bus_id[3] = '0' + instance;
1634 instance ++;
1635 }
1636 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1637 if (!strcmp(device->pnp.bus_id, "VGA")) {
1638 if (instance)
1639 device->pnp.bus_id[3] = '0' + instance;
1640 instance++;
1641 }
1642
1643 video->device = device;
1644 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1645 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1646 device->driver_data = video;
1647
1648 acpi_video_bus_find_cap(video);
1649 error = acpi_video_bus_check(video);
1650 if (error)
1651 goto err_free_video;
1652
1653 mutex_init(&video->device_list_lock);
1654 INIT_LIST_HEAD(&video->video_device_list);
1655
1656 acpi_video_bus_get_devices(video, device);
1657 acpi_video_bus_start_devices(video);
1658
1659 video->input = input = input_allocate_device();
1660 if (!input) {
1661 error = -ENOMEM;
1662 goto err_stop_video;
1663 }
1664
1665 snprintf(video->phys, sizeof(video->phys),
1666 "%s/video/input0", acpi_device_hid(video->device));
1667
1668 input->name = acpi_device_name(video->device);
1669 input->phys = video->phys;
1670 input->id.bustype = BUS_HOST;
1671 input->id.product = 0x06;
1672 input->dev.parent = &device->dev;
1673 input->evbit[0] = BIT(EV_KEY);
1674 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1675 set_bit(KEY_VIDEO_NEXT, input->keybit);
1676 set_bit(KEY_VIDEO_PREV, input->keybit);
1677 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1678 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1679 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1680 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1681 set_bit(KEY_DISPLAY_OFF, input->keybit);
1682
1683 error = input_register_device(input);
1684 if (error)
1685 goto err_free_input_dev;
1686
1687 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
1688 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1689 video->flags.multihead ? "yes" : "no",
1690 video->flags.rom ? "yes" : "no",
1691 video->flags.post ? "yes" : "no");
1692
1693 video->pm_nb.notifier_call = acpi_video_resume;
1694 video->pm_nb.priority = 0;
1695 register_pm_notifier(&video->pm_nb);
1696
1697 return 0;
1698
1699 err_free_input_dev:
1700 input_free_device(input);
1701 err_stop_video:
1702 acpi_video_bus_stop_devices(video);
1703 acpi_video_bus_put_devices(video);
1704 kfree(video->attached_array);
1705 err_free_video:
1706 kfree(video);
1707 device->driver_data = NULL;
1708
1709 return error;
1710}
1711
1712static int acpi_video_bus_remove(struct acpi_device *device, int type)
1713{
1714 struct acpi_video_bus *video = NULL;
1715
1716
1717 if (!device || !acpi_driver_data(device))
1718 return -EINVAL;
1719
1720 video = acpi_driver_data(device);
1721
1722 unregister_pm_notifier(&video->pm_nb);
1723
1724 acpi_video_bus_stop_devices(video);
1725 acpi_video_bus_put_devices(video);
1726
1727 input_unregister_device(video->input);
1728 kfree(video->attached_array);
1729 kfree(video);
1730
1731 return 0;
1732}
1733
1734static int __init intel_opregion_present(void)
1735{
1736#if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
1737 struct pci_dev *dev = NULL;
1738 u32 address;
1739
1740 for_each_pci_dev(dev) {
1741 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1742 continue;
1743 if (dev->vendor != PCI_VENDOR_ID_INTEL)
1744 continue;
1745 pci_read_config_dword(dev, 0xfc, &address);
1746 if (!address)
1747 continue;
1748 return 1;
1749 }
1750#endif
1751 return 0;
1752}
1753
1754int acpi_video_register(void)
1755{
1756 int result = 0;
1757 if (register_count) {
1758 /*
1759 * if the function of acpi_video_register is already called,
1760 * don't register the acpi_vide_bus again and return no error.
1761 */
1762 return 0;
1763 }
1764
1765 result = acpi_bus_register_driver(&acpi_video_bus);
1766 if (result < 0)
1767 return -ENODEV;
1768
1769 /*
1770 * When the acpi_video_bus is loaded successfully, increase
1771 * the counter reference.
1772 */
1773 register_count = 1;
1774
1775 return 0;
1776}
1777EXPORT_SYMBOL(acpi_video_register);
1778
1779void acpi_video_unregister(void)
1780{
1781 if (!register_count) {
1782 /*
1783 * If the acpi video bus is already unloaded, don't
1784 * unload it again and return directly.
1785 */
1786 return;
1787 }
1788 acpi_bus_unregister_driver(&acpi_video_bus);
1789
1790 register_count = 0;
1791
1792 return;
1793}
1794EXPORT_SYMBOL(acpi_video_unregister);
1795
1796/*
1797 * This is kind of nasty. Hardware using Intel chipsets may require
1798 * the video opregion code to be run first in order to initialise
1799 * state before any ACPI video calls are made. To handle this we defer
1800 * registration of the video class until the opregion code has run.
1801 */
1802
1803static int __init acpi_video_init(void)
1804{
1805 dmi_check_system(video_dmi_table);
1806
1807 if (intel_opregion_present())
1808 return 0;
1809
1810 return acpi_video_register();
1811}
1812
1813static void __exit acpi_video_exit(void)
1814{
1815 acpi_video_unregister();
1816
1817 return;
1818}
1819
1820module_init(acpi_video_init);
1821module_exit(acpi_video_exit);