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ipv6: reallocate addrconf router for ipv6 address when lo device up
[linux/fpc-iii.git] / drivers / acpi / video.c
blob8c5ad89a65a5c8c79cc75abab2c97a68e3fdaf93
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, int type);
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 reserved:2;
171 };
172
173 struct 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
182 struct 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
190 struct acpi_video_device_brightness {
191 int curr;
192 int count;
193 int *levels;
194 struct acpi_video_brightness_flags flags;
195 };
196
197 struct acpi_video_device {
198 unsigned long device_id;
199 struct acpi_video_device_flags flags;
200 struct acpi_video_device_cap cap;
201 struct list_head entry;
202 struct 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
209 static const char device_decode[][30] = {
210 "motherboard VGA device",
211 "PCI VGA device",
212 "AGP VGA device",
213 "UNKNOWN",
214 };
215
216 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
217 static void acpi_video_device_rebind(struct acpi_video_bus *video);
218 static void acpi_video_device_bind(struct acpi_video_bus *video,
219 struct acpi_video_device *device);
220 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
221 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
222 int level);
223 static int acpi_video_device_lcd_get_level_current(
224 struct acpi_video_device *device,
225 unsigned long long *level, int init);
226 static int acpi_video_get_next_level(struct acpi_video_device *device,
227 u32 level_current, u32 event);
228 static int acpi_video_switch_brightness(struct acpi_video_device *device,
229 int event);
230
231 /*backlight device sysfs support*/
232 static 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
250 static 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
260 static 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 */
266 static 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
276 static 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
295 static int
296 video_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
310 static 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
320 static int
321 acpi_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
351 static int
352 acpi_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
385 static int bqc_offset_aml_bug_workaround;
386 static 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
392 static int video_ignore_initial_backlight(const struct dmi_system_id *d)
393 {
394 use_bios_initial_backlight = 0;
395 return 0;
396 }
397
398 static struct dmi_system_id video_dmi_table[] __initdata = {
399 /*
400 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
401 */
402 {
403 .callback = video_set_bqc_offset,
404 .ident = "Acer Aspire 5720",
405 .matches = {
406 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
407 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
408 },
409 },
410 {
411 .callback = video_set_bqc_offset,
412 .ident = "Acer Aspire 5710Z",
413 .matches = {
414 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
415 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
416 },
417 },
418 {
419 .callback = video_set_bqc_offset,
420 .ident = "eMachines E510",
421 .matches = {
422 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
423 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
424 },
425 },
426 {
427 .callback = video_set_bqc_offset,
428 .ident = "Acer Aspire 5315",
429 .matches = {
430 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
431 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
432 },
433 },
434 {
435 .callback = video_set_bqc_offset,
436 .ident = "Acer Aspire 7720",
437 .matches = {
438 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
439 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
440 },
441 },
442 {
443 .callback = video_ignore_initial_backlight,
444 .ident = "HP Folio 13-2000",
445 .matches = {
446 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
447 DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13 - 2000 Notebook PC"),
448 },
449 },
450 {
451 .callback = video_ignore_initial_backlight,
452 .ident = "HP Pavilion g6 Notebook PC",
453 .matches = {
454 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
455 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion g6 Notebook PC"),
456 },
457 },
458 {
459 .callback = video_ignore_initial_backlight,
460 .ident = "HP Pavilion m4",
461 .matches = {
462 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
463 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion m4 Notebook PC"),
464 },
465 },
466 {
467 .callback = video_ignore_initial_backlight,
468 .ident = "HP 1000 Notebook PC",
469 .matches = {
470 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
471 DMI_MATCH(DMI_PRODUCT_NAME, "HP 1000 Notebook PC"),
472 },
473 },
474 {
475 .callback = video_ignore_initial_backlight,
476 .ident = "HP Pavilion dm4",
477 .matches = {
478 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
479 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dm4 Notebook PC"),
480 },
481 },
482 {}
483 };
484
485 static int
486 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
487 unsigned long long *level, int init)
488 {
489 acpi_status status = AE_OK;
490 int i;
491
492 if (device->cap._BQC || device->cap._BCQ) {
493 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
494
495 status = acpi_evaluate_integer(device->dev->handle, buf,
496 NULL, level);
497 if (ACPI_SUCCESS(status)) {
498 if (device->brightness->flags._BQC_use_index) {
499 if (device->brightness->flags._BCL_reversed)
500 *level = device->brightness->count
501 - 3 - (*level);
502 *level = device->brightness->levels[*level + 2];
503
504 }
505 *level += bqc_offset_aml_bug_workaround;
506 for (i = 2; i < device->brightness->count; i++)
507 if (device->brightness->levels[i] == *level) {
508 device->brightness->curr = *level;
509 return 0;
510 }
511 if (!init) {
512 /*
513 * BQC returned an invalid level.
514 * Stop using it.
515 */
516 ACPI_WARNING((AE_INFO,
517 "%s returned an invalid level",
518 buf));
519 device->cap._BQC = device->cap._BCQ = 0;
520 }
521 } else {
522 /* Fixme:
523 * should we return an error or ignore this failure?
524 * dev->brightness->curr is a cached value which stores
525 * the correct current backlight level in most cases.
526 * ACPI video backlight still works w/ buggy _BQC.
527 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
528 */
529 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
530 device->cap._BQC = device->cap._BCQ = 0;
531 }
532 }
533
534 *level = device->brightness->curr;
535 return 0;
536 }
537
538 static int
539 acpi_video_device_EDID(struct acpi_video_device *device,
540 union acpi_object **edid, ssize_t length)
541 {
542 int status;
543 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
544 union acpi_object *obj;
545 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
546 struct acpi_object_list args = { 1, &arg0 };
547
548
549 *edid = NULL;
550
551 if (!device)
552 return -ENODEV;
553 if (length == 128)
554 arg0.integer.value = 1;
555 else if (length == 256)
556 arg0.integer.value = 2;
557 else
558 return -EINVAL;
559
560 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
561 if (ACPI_FAILURE(status))
562 return -ENODEV;
563
564 obj = buffer.pointer;
565
566 if (obj && obj->type == ACPI_TYPE_BUFFER)
567 *edid = obj;
568 else {
569 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
570 status = -EFAULT;
571 kfree(obj);
572 }
573
574 return status;
575 }
576
577 /* bus */
578
579 /*
580 * Arg:
581 * video : video bus device pointer
582 * bios_flag :
583 * 0. The system BIOS should NOT automatically switch(toggle)
584 * the active display output.
585 * 1. The system BIOS should automatically switch (toggle) the
586 * active display output. No switch event.
587 * 2. The _DGS value should be locked.
588 * 3. The system BIOS should not automatically switch (toggle) the
589 * active display output, but instead generate the display switch
590 * event notify code.
591 * lcd_flag :
592 * 0. The system BIOS should automatically control the brightness level
593 * of the LCD when the power changes from AC to DC
594 * 1. The system BIOS should NOT automatically control the brightness
595 * level of the LCD when the power changes from AC to DC.
596 * Return Value:
597 * -EINVAL wrong arg.
598 */
599
600 static int
601 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
602 {
603 acpi_status status;
604 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
605 struct acpi_object_list args = { 1, &arg0 };
606
607 if (!video->cap._DOS)
608 return 0;
609
610 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
611 return -EINVAL;
612 arg0.integer.value = (lcd_flag << 2) | bios_flag;
613 video->dos_setting = arg0.integer.value;
614 status = acpi_evaluate_object(video->device->handle, "_DOS",
615 &args, NULL);
616 if (ACPI_FAILURE(status))
617 return -EIO;
618
619 return 0;
620 }
621
622 /*
623 * Simple comparison function used to sort backlight levels.
624 */
625
626 static int
627 acpi_video_cmp_level(const void *a, const void *b)
628 {
629 return *(int *)a - *(int *)b;
630 }
631
632 /*
633 * Arg:
634 * device : video output device (LCD, CRT, ..)
635 *
636 * Return Value:
637 * Maximum brightness level
638 *
639 * Allocate and initialize device->brightness.
640 */
641
642 static int
643 acpi_video_init_brightness(struct acpi_video_device *device)
644 {
645 union acpi_object *obj = NULL;
646 int i, max_level = 0, count = 0, level_ac_battery = 0;
647 unsigned long long level, level_old;
648 union acpi_object *o;
649 struct acpi_video_device_brightness *br = NULL;
650 int result = -EINVAL;
651 u32 value;
652
653 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
654 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
655 "LCD brightness level\n"));
656 goto out;
657 }
658
659 if (obj->package.count < 2)
660 goto out;
661
662 br = kzalloc(sizeof(*br), GFP_KERNEL);
663 if (!br) {
664 printk(KERN_ERR "can't allocate memory\n");
665 result = -ENOMEM;
666 goto out;
667 }
668
669 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
670 GFP_KERNEL);
671 if (!br->levels) {
672 result = -ENOMEM;
673 goto out_free;
674 }
675
676 for (i = 0; i < obj->package.count; i++) {
677 o = (union acpi_object *)&obj->package.elements[i];
678 if (o->type != ACPI_TYPE_INTEGER) {
679 printk(KERN_ERR PREFIX "Invalid data\n");
680 continue;
681 }
682 value = (u32) o->integer.value;
683 /* Skip duplicate entries */
684 if (count > 2 && br->levels[count - 1] == value)
685 continue;
686
687 br->levels[count] = value;
688
689 if (br->levels[count] > max_level)
690 max_level = br->levels[count];
691 count++;
692 }
693
694 /*
695 * some buggy BIOS don't export the levels
696 * when machine is on AC/Battery in _BCL package.
697 * In this case, the first two elements in _BCL packages
698 * are also supported brightness levels that OS should take care of.
699 */
700 for (i = 2; i < count; i++) {
701 if (br->levels[i] == br->levels[0])
702 level_ac_battery++;
703 if (br->levels[i] == br->levels[1])
704 level_ac_battery++;
705 }
706
707 if (level_ac_battery < 2) {
708 level_ac_battery = 2 - level_ac_battery;
709 br->flags._BCL_no_ac_battery_levels = 1;
710 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
711 br->levels[i] = br->levels[i - level_ac_battery];
712 count += level_ac_battery;
713 } else if (level_ac_battery > 2)
714 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
715
716 /* Check if the _BCL package is in a reversed order */
717 if (max_level == br->levels[2]) {
718 br->flags._BCL_reversed = 1;
719 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
720 acpi_video_cmp_level, NULL);
721 } else if (max_level != br->levels[count - 1])
722 ACPI_ERROR((AE_INFO,
723 "Found unordered _BCL package\n"));
724
725 br->count = count;
726 device->brightness = br;
727
728 /* Check the input/output of _BQC/_BCL/_BCM */
729 if ((max_level < 100) && (max_level <= (count - 2)))
730 br->flags._BCL_use_index = 1;
731
732 /*
733 * _BCM is always consistent with _BCL,
734 * at least for all the laptops we have ever seen.
735 */
736 br->flags._BCM_use_index = br->flags._BCL_use_index;
737
738 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
739 br->curr = level = max_level;
740
741 if (!device->cap._BQC)
742 goto set_level;
743
744 result = acpi_video_device_lcd_get_level_current(device, &level_old, 1);
745 if (result)
746 goto out_free_levels;
747
748 /*
749 * Set the level to maximum and check if _BQC uses indexed value
750 */
751 result = acpi_video_device_lcd_set_level(device, max_level);
752 if (result)
753 goto out_free_levels;
754
755 result = acpi_video_device_lcd_get_level_current(device, &level, 0);
756 if (result)
757 goto out_free_levels;
758
759 br->flags._BQC_use_index = (level == max_level ? 0 : 1);
760
761 if (!br->flags._BQC_use_index) {
762 /*
763 * Set the backlight to the initial state.
764 * On some buggy laptops, _BQC returns an uninitialized value
765 * when invoked for the first time, i.e. level_old is invalid.
766 * set the backlight to max_level in this case
767 */
768 if (use_bios_initial_backlight) {
769 for (i = 2; i < br->count; i++)
770 if (level_old == br->levels[i])
771 level = level_old;
772 }
773 goto set_level;
774 }
775
776 if (br->flags._BCL_reversed)
777 level_old = (br->count - 1) - level_old;
778 level = br->levels[level_old];
779
780 set_level:
781 result = acpi_video_device_lcd_set_level(device, level);
782 if (result)
783 goto out_free_levels;
784
785 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
786 "found %d brightness levels\n", count - 2));
787 kfree(obj);
788 return result;
789
790 out_free_levels:
791 kfree(br->levels);
792 out_free:
793 kfree(br);
794 out:
795 device->brightness = NULL;
796 kfree(obj);
797 return result;
798 }
799
800 /*
801 * Arg:
802 * device : video output device (LCD, CRT, ..)
803 *
804 * Return Value:
805 * None
806 *
807 * Find out all required AML methods defined under the output
808 * device.
809 */
810
811 static void acpi_video_device_find_cap(struct acpi_video_device *device)
812 {
813 acpi_handle h_dummy1;
814
815 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
816 device->cap._ADR = 1;
817 }
818 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
819 device->cap._BCL = 1;
820 }
821 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
822 device->cap._BCM = 1;
823 }
824 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
825 device->cap._BQC = 1;
826 else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
827 &h_dummy1))) {
828 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
829 device->cap._BCQ = 1;
830 }
831
832 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
833 device->cap._DDC = 1;
834 }
835
836 if (acpi_video_backlight_support()) {
837 struct backlight_properties props;
838 struct pci_dev *pdev;
839 acpi_handle acpi_parent;
840 struct device *parent = NULL;
841 int result;
842 static int count = 0;
843 char *name;
844
845 result = acpi_video_init_brightness(device);
846 if (result)
847 return;
848 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
849 if (!name)
850 return;
851 count++;
852
853 acpi_get_parent(device->dev->handle, &acpi_parent);
854
855 pdev = acpi_get_pci_dev(acpi_parent);
856 if (pdev) {
857 parent = &pdev->dev;
858 pci_dev_put(pdev);
859 }
860
861 memset(&props, 0, sizeof(struct backlight_properties));
862 props.type = BACKLIGHT_FIRMWARE;
863 props.max_brightness = device->brightness->count - 3;
864 device->backlight = backlight_device_register(name,
865 parent,
866 device,
867 &acpi_backlight_ops,
868 &props);
869 kfree(name);
870 if (IS_ERR(device->backlight))
871 return;
872
873 /*
874 * Save current brightness level in case we have to restore it
875 * before acpi_video_device_lcd_set_level() is called next time.
876 */
877 device->backlight->props.brightness =
878 acpi_video_get_brightness(device->backlight);
879
880 device->cooling_dev = thermal_cooling_device_register("LCD",
881 device->dev, &video_cooling_ops);
882 if (IS_ERR(device->cooling_dev)) {
883 /*
884 * Set cooling_dev to NULL so we don't crash trying to
885 * free it.
886 * Also, why the hell we are returning early and
887 * not attempt to register video output if cooling
888 * device registration failed?
889 * -- dtor
890 */
891 device->cooling_dev = NULL;
892 return;
893 }
894
895 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
896 device->cooling_dev->id);
897 result = sysfs_create_link(&device->dev->dev.kobj,
898 &device->cooling_dev->device.kobj,
899 "thermal_cooling");
900 if (result)
901 printk(KERN_ERR PREFIX "Create sysfs link\n");
902 result = sysfs_create_link(&device->cooling_dev->device.kobj,
903 &device->dev->dev.kobj, "device");
904 if (result)
905 printk(KERN_ERR PREFIX "Create sysfs link\n");
906
907 }
908 }
909
910 /*
911 * Arg:
912 * device : video output device (VGA)
913 *
914 * Return Value:
915 * None
916 *
917 * Find out all required AML methods defined under the video bus device.
918 */
919
920 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
921 {
922 acpi_handle h_dummy1;
923
924 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
925 video->cap._DOS = 1;
926 }
927 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
928 video->cap._DOD = 1;
929 }
930 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
931 video->cap._ROM = 1;
932 }
933 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
934 video->cap._GPD = 1;
935 }
936 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
937 video->cap._SPD = 1;
938 }
939 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
940 video->cap._VPO = 1;
941 }
942 }
943
944 /*
945 * Check whether the video bus device has required AML method to
946 * support the desired features
947 */
948
949 static int acpi_video_bus_check(struct acpi_video_bus *video)
950 {
951 acpi_status status = -ENOENT;
952 struct pci_dev *dev;
953
954 if (!video)
955 return -EINVAL;
956
957 dev = acpi_get_pci_dev(video->device->handle);
958 if (!dev)
959 return -ENODEV;
960 pci_dev_put(dev);
961
962 /* Since there is no HID, CID and so on for VGA driver, we have
963 * to check well known required nodes.
964 */
965
966 /* Does this device support video switching? */
967 if (video->cap._DOS || video->cap._DOD) {
968 if (!video->cap._DOS) {
969 printk(KERN_WARNING FW_BUG
970 "ACPI(%s) defines _DOD but not _DOS\n",
971 acpi_device_bid(video->device));
972 }
973 video->flags.multihead = 1;
974 status = 0;
975 }
976
977 /* Does this device support retrieving a video ROM? */
978 if (video->cap._ROM) {
979 video->flags.rom = 1;
980 status = 0;
981 }
982
983 /* Does this device support configuring which video device to POST? */
984 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
985 video->flags.post = 1;
986 status = 0;
987 }
988
989 return status;
990 }
991
992 /* --------------------------------------------------------------------------
993 Driver Interface
994 -------------------------------------------------------------------------- */
995
996 /* device interface */
997 static struct acpi_video_device_attrib*
998 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
999 {
1000 struct acpi_video_enumerated_device *ids;
1001 int i;
1002
1003 for (i = 0; i < video->attached_count; i++) {
1004 ids = &video->attached_array[i];
1005 if ((ids->value.int_val & 0xffff) == device_id)
1006 return &ids->value.attrib;
1007 }
1008
1009 return NULL;
1010 }
1011
1012 static int
1013 acpi_video_get_device_type(struct acpi_video_bus *video,
1014 unsigned long device_id)
1015 {
1016 struct acpi_video_enumerated_device *ids;
1017 int i;
1018
1019 for (i = 0; i < video->attached_count; i++) {
1020 ids = &video->attached_array[i];
1021 if ((ids->value.int_val & 0xffff) == device_id)
1022 return ids->value.int_val;
1023 }
1024
1025 return 0;
1026 }
1027
1028 static int
1029 acpi_video_bus_get_one_device(struct acpi_device *device,
1030 struct acpi_video_bus *video)
1031 {
1032 unsigned long long device_id;
1033 int status, device_type;
1034 struct acpi_video_device *data;
1035 struct acpi_video_device_attrib* attribute;
1036
1037 if (!device || !video)
1038 return -EINVAL;
1039
1040 status =
1041 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1042 if (ACPI_SUCCESS(status)) {
1043
1044 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1045 if (!data)
1046 return -ENOMEM;
1047
1048 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1049 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1050 device->driver_data = data;
1051
1052 data->device_id = device_id;
1053 data->video = video;
1054 data->dev = device;
1055
1056 attribute = acpi_video_get_device_attr(video, device_id);
1057
1058 if((attribute != NULL) && attribute->device_id_scheme) {
1059 switch (attribute->display_type) {
1060 case ACPI_VIDEO_DISPLAY_CRT:
1061 data->flags.crt = 1;
1062 break;
1063 case ACPI_VIDEO_DISPLAY_TV:
1064 data->flags.tvout = 1;
1065 break;
1066 case ACPI_VIDEO_DISPLAY_DVI:
1067 data->flags.dvi = 1;
1068 break;
1069 case ACPI_VIDEO_DISPLAY_LCD:
1070 data->flags.lcd = 1;
1071 break;
1072 default:
1073 data->flags.unknown = 1;
1074 break;
1075 }
1076 if(attribute->bios_can_detect)
1077 data->flags.bios = 1;
1078 } else {
1079 /* Check for legacy IDs */
1080 device_type = acpi_video_get_device_type(video,
1081 device_id);
1082 /* Ignore bits 16 and 18-20 */
1083 switch (device_type & 0xffe2ffff) {
1084 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1085 data->flags.crt = 1;
1086 break;
1087 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1088 data->flags.lcd = 1;
1089 break;
1090 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1091 data->flags.tvout = 1;
1092 break;
1093 default:
1094 data->flags.unknown = 1;
1095 }
1096 }
1097
1098 acpi_video_device_bind(video, data);
1099 acpi_video_device_find_cap(data);
1100
1101 status = acpi_install_notify_handler(device->handle,
1102 ACPI_DEVICE_NOTIFY,
1103 acpi_video_device_notify,
1104 data);
1105 if (ACPI_FAILURE(status)) {
1106 printk(KERN_ERR PREFIX
1107 "Error installing notify handler\n");
1108 if(data->brightness)
1109 kfree(data->brightness->levels);
1110 kfree(data->brightness);
1111 kfree(data);
1112 return -ENODEV;
1113 }
1114
1115 mutex_lock(&video->device_list_lock);
1116 list_add_tail(&data->entry, &video->video_device_list);
1117 mutex_unlock(&video->device_list_lock);
1118
1119 return 0;
1120 }
1121
1122 return -ENOENT;
1123 }
1124
1125 /*
1126 * Arg:
1127 * video : video bus device
1128 *
1129 * Return:
1130 * none
1131 *
1132 * Enumerate the video device list of the video bus,
1133 * bind the ids with the corresponding video devices
1134 * under the video bus.
1135 */
1136
1137 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1138 {
1139 struct acpi_video_device *dev;
1140
1141 mutex_lock(&video->device_list_lock);
1142
1143 list_for_each_entry(dev, &video->video_device_list, entry)
1144 acpi_video_device_bind(video, dev);
1145
1146 mutex_unlock(&video->device_list_lock);
1147 }
1148
1149 /*
1150 * Arg:
1151 * video : video bus device
1152 * device : video output device under the video
1153 * bus
1154 *
1155 * Return:
1156 * none
1157 *
1158 * Bind the ids with the corresponding video devices
1159 * under the video bus.
1160 */
1161
1162 static void
1163 acpi_video_device_bind(struct acpi_video_bus *video,
1164 struct acpi_video_device *device)
1165 {
1166 struct acpi_video_enumerated_device *ids;
1167 int i;
1168
1169 for (i = 0; i < video->attached_count; i++) {
1170 ids = &video->attached_array[i];
1171 if (device->device_id == (ids->value.int_val & 0xffff)) {
1172 ids->bind_info = device;
1173 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1174 }
1175 }
1176 }
1177
1178 /*
1179 * Arg:
1180 * video : video bus device
1181 *
1182 * Return:
1183 * < 0 : error
1184 *
1185 * Call _DOD to enumerate all devices attached to display adapter
1186 *
1187 */
1188
1189 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1190 {
1191 int status;
1192 int count;
1193 int i;
1194 struct acpi_video_enumerated_device *active_list;
1195 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1196 union acpi_object *dod = NULL;
1197 union acpi_object *obj;
1198
1199 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1200 if (!ACPI_SUCCESS(status)) {
1201 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1202 return status;
1203 }
1204
1205 dod = buffer.pointer;
1206 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1207 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1208 status = -EFAULT;
1209 goto out;
1210 }
1211
1212 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1213 dod->package.count));
1214
1215 active_list = kcalloc(1 + dod->package.count,
1216 sizeof(struct acpi_video_enumerated_device),
1217 GFP_KERNEL);
1218 if (!active_list) {
1219 status = -ENOMEM;
1220 goto out;
1221 }
1222
1223 count = 0;
1224 for (i = 0; i < dod->package.count; i++) {
1225 obj = &dod->package.elements[i];
1226
1227 if (obj->type != ACPI_TYPE_INTEGER) {
1228 printk(KERN_ERR PREFIX
1229 "Invalid _DOD data in element %d\n", i);
1230 continue;
1231 }
1232
1233 active_list[count].value.int_val = obj->integer.value;
1234 active_list[count].bind_info = NULL;
1235 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1236 (int)obj->integer.value));
1237 count++;
1238 }
1239
1240 kfree(video->attached_array);
1241
1242 video->attached_array = active_list;
1243 video->attached_count = count;
1244
1245 out:
1246 kfree(buffer.pointer);
1247 return status;
1248 }
1249
1250 static int
1251 acpi_video_get_next_level(struct acpi_video_device *device,
1252 u32 level_current, u32 event)
1253 {
1254 int min, max, min_above, max_below, i, l, delta = 255;
1255 max = max_below = 0;
1256 min = min_above = 255;
1257 /* Find closest level to level_current */
1258 for (i = 2; i < device->brightness->count; i++) {
1259 l = device->brightness->levels[i];
1260 if (abs(l - level_current) < abs(delta)) {
1261 delta = l - level_current;
1262 if (!delta)
1263 break;
1264 }
1265 }
1266 /* Ajust level_current to closest available level */
1267 level_current += delta;
1268 for (i = 2; i < device->brightness->count; i++) {
1269 l = device->brightness->levels[i];
1270 if (l < min)
1271 min = l;
1272 if (l > max)
1273 max = l;
1274 if (l < min_above && l > level_current)
1275 min_above = l;
1276 if (l > max_below && l < level_current)
1277 max_below = l;
1278 }
1279
1280 switch (event) {
1281 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1282 return (level_current < max) ? min_above : min;
1283 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1284 return (level_current < max) ? min_above : max;
1285 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1286 return (level_current > min) ? max_below : min;
1287 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1288 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1289 return 0;
1290 default:
1291 return level_current;
1292 }
1293 }
1294
1295 static int
1296 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1297 {
1298 unsigned long long level_current, level_next;
1299 int result = -EINVAL;
1300
1301 /* no warning message if acpi_backlight=vendor is used */
1302 if (!acpi_video_backlight_support())
1303 return 0;
1304
1305 if (!device->brightness)
1306 goto out;
1307
1308 result = acpi_video_device_lcd_get_level_current(device,
1309 &level_current, 0);
1310 if (result)
1311 goto out;
1312
1313 level_next = acpi_video_get_next_level(device, level_current, event);
1314
1315 result = acpi_video_device_lcd_set_level(device, level_next);
1316
1317 if (!result)
1318 backlight_force_update(device->backlight,
1319 BACKLIGHT_UPDATE_HOTKEY);
1320
1321 out:
1322 if (result)
1323 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1324
1325 return result;
1326 }
1327
1328 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1329 void **edid)
1330 {
1331 struct acpi_video_bus *video;
1332 struct acpi_video_device *video_device;
1333 union acpi_object *buffer = NULL;
1334 acpi_status status;
1335 int i, length;
1336
1337 if (!device || !acpi_driver_data(device))
1338 return -EINVAL;
1339
1340 video = acpi_driver_data(device);
1341
1342 for (i = 0; i < video->attached_count; i++) {
1343 video_device = video->attached_array[i].bind_info;
1344 length = 256;
1345
1346 if (!video_device)
1347 continue;
1348
1349 if (!video_device->cap._DDC)
1350 continue;
1351
1352 if (type) {
1353 switch (type) {
1354 case ACPI_VIDEO_DISPLAY_CRT:
1355 if (!video_device->flags.crt)
1356 continue;
1357 break;
1358 case ACPI_VIDEO_DISPLAY_TV:
1359 if (!video_device->flags.tvout)
1360 continue;
1361 break;
1362 case ACPI_VIDEO_DISPLAY_DVI:
1363 if (!video_device->flags.dvi)
1364 continue;
1365 break;
1366 case ACPI_VIDEO_DISPLAY_LCD:
1367 if (!video_device->flags.lcd)
1368 continue;
1369 break;
1370 }
1371 } else if (video_device->device_id != device_id) {
1372 continue;
1373 }
1374
1375 status = acpi_video_device_EDID(video_device, &buffer, length);
1376
1377 if (ACPI_FAILURE(status) || !buffer ||
1378 buffer->type != ACPI_TYPE_BUFFER) {
1379 length = 128;
1380 status = acpi_video_device_EDID(video_device, &buffer,
1381 length);
1382 if (ACPI_FAILURE(status) || !buffer ||
1383 buffer->type != ACPI_TYPE_BUFFER) {
1384 continue;
1385 }
1386 }
1387
1388 *edid = buffer->buffer.pointer;
1389 return length;
1390 }
1391
1392 return -ENODEV;
1393 }
1394 EXPORT_SYMBOL(acpi_video_get_edid);
1395
1396 static int
1397 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1398 struct acpi_device *device)
1399 {
1400 int status = 0;
1401 struct acpi_device *dev;
1402
1403 /*
1404 * There are systems where video module known to work fine regardless
1405 * of broken _DOD and ignoring returned value here doesn't cause
1406 * any issues later.
1407 */
1408 acpi_video_device_enumerate(video);
1409
1410 list_for_each_entry(dev, &device->children, node) {
1411
1412 status = acpi_video_bus_get_one_device(dev, video);
1413 if (status) {
1414 printk(KERN_WARNING PREFIX
1415 "Can't attach device\n");
1416 continue;
1417 }
1418 }
1419 return status;
1420 }
1421
1422 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1423 {
1424 acpi_status status;
1425
1426 if (!device || !device->video)
1427 return -ENOENT;
1428
1429 status = acpi_remove_notify_handler(device->dev->handle,
1430 ACPI_DEVICE_NOTIFY,
1431 acpi_video_device_notify);
1432 if (ACPI_FAILURE(status)) {
1433 printk(KERN_WARNING PREFIX
1434 "Can't remove video notify handler\n");
1435 }
1436 if (device->backlight) {
1437 backlight_device_unregister(device->backlight);
1438 device->backlight = NULL;
1439 }
1440 if (device->cooling_dev) {
1441 sysfs_remove_link(&device->dev->dev.kobj,
1442 "thermal_cooling");
1443 sysfs_remove_link(&device->cooling_dev->device.kobj,
1444 "device");
1445 thermal_cooling_device_unregister(device->cooling_dev);
1446 device->cooling_dev = NULL;
1447 }
1448
1449 return 0;
1450 }
1451
1452 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1453 {
1454 int status;
1455 struct acpi_video_device *dev, *next;
1456
1457 mutex_lock(&video->device_list_lock);
1458
1459 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1460
1461 status = acpi_video_bus_put_one_device(dev);
1462 if (ACPI_FAILURE(status))
1463 printk(KERN_WARNING PREFIX
1464 "hhuuhhuu bug in acpi video driver.\n");
1465
1466 if (dev->brightness) {
1467 kfree(dev->brightness->levels);
1468 kfree(dev->brightness);
1469 }
1470 list_del(&dev->entry);
1471 kfree(dev);
1472 }
1473
1474 mutex_unlock(&video->device_list_lock);
1475
1476 return 0;
1477 }
1478
1479 /* acpi_video interface */
1480
1481 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1482 {
1483 return acpi_video_bus_DOS(video, 0, 0);
1484 }
1485
1486 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1487 {
1488 return acpi_video_bus_DOS(video, 0, 1);
1489 }
1490
1491 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1492 {
1493 struct acpi_video_bus *video = acpi_driver_data(device);
1494 struct input_dev *input;
1495 int keycode = 0;
1496
1497 if (!video)
1498 return;
1499
1500 input = video->input;
1501
1502 switch (event) {
1503 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1504 * most likely via hotkey. */
1505 acpi_bus_generate_proc_event(device, event, 0);
1506 if (!acpi_notifier_call_chain(device, event, 0))
1507 keycode = KEY_SWITCHVIDEOMODE;
1508 break;
1509
1510 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1511 * connector. */
1512 acpi_video_device_enumerate(video);
1513 acpi_video_device_rebind(video);
1514 acpi_bus_generate_proc_event(device, event, 0);
1515 keycode = KEY_SWITCHVIDEOMODE;
1516 break;
1517
1518 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1519 acpi_bus_generate_proc_event(device, event, 0);
1520 keycode = KEY_SWITCHVIDEOMODE;
1521 break;
1522 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1523 acpi_bus_generate_proc_event(device, event, 0);
1524 keycode = KEY_VIDEO_NEXT;
1525 break;
1526 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1527 acpi_bus_generate_proc_event(device, event, 0);
1528 keycode = KEY_VIDEO_PREV;
1529 break;
1530
1531 default:
1532 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1533 "Unsupported event [0x%x]\n", event));
1534 break;
1535 }
1536
1537 if (event != ACPI_VIDEO_NOTIFY_SWITCH)
1538 acpi_notifier_call_chain(device, event, 0);
1539
1540 if (keycode) {
1541 input_report_key(input, keycode, 1);
1542 input_sync(input);
1543 input_report_key(input, keycode, 0);
1544 input_sync(input);
1545 }
1546
1547 return;
1548 }
1549
1550 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1551 {
1552 struct acpi_video_device *video_device = data;
1553 struct acpi_device *device = NULL;
1554 struct acpi_video_bus *bus;
1555 struct input_dev *input;
1556 int keycode = 0;
1557
1558 if (!video_device)
1559 return;
1560
1561 device = video_device->dev;
1562 bus = video_device->video;
1563 input = bus->input;
1564
1565 switch (event) {
1566 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1567 if (brightness_switch_enabled)
1568 acpi_video_switch_brightness(video_device, event);
1569 acpi_bus_generate_proc_event(device, event, 0);
1570 keycode = KEY_BRIGHTNESS_CYCLE;
1571 break;
1572 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1573 if (brightness_switch_enabled)
1574 acpi_video_switch_brightness(video_device, event);
1575 acpi_bus_generate_proc_event(device, event, 0);
1576 keycode = KEY_BRIGHTNESSUP;
1577 break;
1578 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1579 if (brightness_switch_enabled)
1580 acpi_video_switch_brightness(video_device, event);
1581 acpi_bus_generate_proc_event(device, event, 0);
1582 keycode = KEY_BRIGHTNESSDOWN;
1583 break;
1584 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1585 if (brightness_switch_enabled)
1586 acpi_video_switch_brightness(video_device, event);
1587 acpi_bus_generate_proc_event(device, event, 0);
1588 keycode = KEY_BRIGHTNESS_ZERO;
1589 break;
1590 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1591 if (brightness_switch_enabled)
1592 acpi_video_switch_brightness(video_device, event);
1593 acpi_bus_generate_proc_event(device, event, 0);
1594 keycode = KEY_DISPLAY_OFF;
1595 break;
1596 default:
1597 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1598 "Unsupported event [0x%x]\n", event));
1599 break;
1600 }
1601
1602 acpi_notifier_call_chain(device, event, 0);
1603
1604 if (keycode) {
1605 input_report_key(input, keycode, 1);
1606 input_sync(input);
1607 input_report_key(input, keycode, 0);
1608 input_sync(input);
1609 }
1610
1611 return;
1612 }
1613
1614 static int acpi_video_resume(struct notifier_block *nb,
1615 unsigned long val, void *ign)
1616 {
1617 struct acpi_video_bus *video;
1618 struct acpi_video_device *video_device;
1619 int i;
1620
1621 switch (val) {
1622 case PM_HIBERNATION_PREPARE:
1623 case PM_SUSPEND_PREPARE:
1624 case PM_RESTORE_PREPARE:
1625 return NOTIFY_DONE;
1626 }
1627
1628 video = container_of(nb, struct acpi_video_bus, pm_nb);
1629
1630 dev_info(&video->device->dev, "Restoring backlight state\n");
1631
1632 for (i = 0; i < video->attached_count; i++) {
1633 video_device = video->attached_array[i].bind_info;
1634 if (video_device && video_device->backlight)
1635 acpi_video_set_brightness(video_device->backlight);
1636 }
1637
1638 return NOTIFY_OK;
1639 }
1640
1641 static acpi_status
1642 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1643 void **return_value)
1644 {
1645 struct acpi_device *device = context;
1646 struct acpi_device *sibling;
1647 int result;
1648
1649 if (handle == device->handle)
1650 return AE_CTRL_TERMINATE;
1651
1652 result = acpi_bus_get_device(handle, &sibling);
1653 if (result)
1654 return AE_OK;
1655
1656 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1657 return AE_ALREADY_EXISTS;
1658
1659 return AE_OK;
1660 }
1661
1662 static int instance;
1663
1664 static int acpi_video_bus_add(struct acpi_device *device)
1665 {
1666 struct acpi_video_bus *video;
1667 struct input_dev *input;
1668 int error;
1669 acpi_status status;
1670
1671 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1672 device->parent->handle, 1,
1673 acpi_video_bus_match, NULL,
1674 device, NULL);
1675 if (status == AE_ALREADY_EXISTS) {
1676 printk(KERN_WARNING FW_BUG
1677 "Duplicate ACPI video bus devices for the"
1678 " same VGA controller, please try module "
1679 "parameter \"video.allow_duplicates=1\""
1680 "if the current driver doesn't work.\n");
1681 if (!allow_duplicates)
1682 return -ENODEV;
1683 }
1684
1685 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1686 if (!video)
1687 return -ENOMEM;
1688
1689 /* a hack to fix the duplicate name "VID" problem on T61 */
1690 if (!strcmp(device->pnp.bus_id, "VID")) {
1691 if (instance)
1692 device->pnp.bus_id[3] = '0' + instance;
1693 instance ++;
1694 }
1695 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1696 if (!strcmp(device->pnp.bus_id, "VGA")) {
1697 if (instance)
1698 device->pnp.bus_id[3] = '0' + instance;
1699 instance++;
1700 }
1701
1702 video->device = device;
1703 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1704 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1705 device->driver_data = video;
1706
1707 acpi_video_bus_find_cap(video);
1708 error = acpi_video_bus_check(video);
1709 if (error)
1710 goto err_free_video;
1711
1712 mutex_init(&video->device_list_lock);
1713 INIT_LIST_HEAD(&video->video_device_list);
1714
1715 error = acpi_video_bus_get_devices(video, device);
1716 if (error)
1717 goto err_free_video;
1718
1719 video->input = input = input_allocate_device();
1720 if (!input) {
1721 error = -ENOMEM;
1722 goto err_put_video;
1723 }
1724
1725 error = acpi_video_bus_start_devices(video);
1726 if (error)
1727 goto err_free_input_dev;
1728
1729 snprintf(video->phys, sizeof(video->phys),
1730 "%s/video/input0", acpi_device_hid(video->device));
1731
1732 input->name = acpi_device_name(video->device);
1733 input->phys = video->phys;
1734 input->id.bustype = BUS_HOST;
1735 input->id.product = 0x06;
1736 input->dev.parent = &device->dev;
1737 input->evbit[0] = BIT(EV_KEY);
1738 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1739 set_bit(KEY_VIDEO_NEXT, input->keybit);
1740 set_bit(KEY_VIDEO_PREV, input->keybit);
1741 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1742 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1743 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1744 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1745 set_bit(KEY_DISPLAY_OFF, input->keybit);
1746
1747 error = input_register_device(input);
1748 if (error)
1749 goto err_stop_video;
1750
1751 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
1752 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1753 video->flags.multihead ? "yes" : "no",
1754 video->flags.rom ? "yes" : "no",
1755 video->flags.post ? "yes" : "no");
1756
1757 video->pm_nb.notifier_call = acpi_video_resume;
1758 video->pm_nb.priority = 0;
1759 error = register_pm_notifier(&video->pm_nb);
1760 if (error)
1761 goto err_unregister_input_dev;
1762
1763 return 0;
1764
1765 err_unregister_input_dev:
1766 input_unregister_device(input);
1767 err_stop_video:
1768 acpi_video_bus_stop_devices(video);
1769 err_free_input_dev:
1770 input_free_device(input);
1771 err_put_video:
1772 acpi_video_bus_put_devices(video);
1773 kfree(video->attached_array);
1774 err_free_video:
1775 kfree(video);
1776 device->driver_data = NULL;
1777
1778 return error;
1779 }
1780
1781 static int acpi_video_bus_remove(struct acpi_device *device, int type)
1782 {
1783 struct acpi_video_bus *video = NULL;
1784
1785
1786 if (!device || !acpi_driver_data(device))
1787 return -EINVAL;
1788
1789 video = acpi_driver_data(device);
1790
1791 unregister_pm_notifier(&video->pm_nb);
1792
1793 acpi_video_bus_stop_devices(video);
1794 acpi_video_bus_put_devices(video);
1795
1796 input_unregister_device(video->input);
1797 kfree(video->attached_array);
1798 kfree(video);
1799
1800 return 0;
1801 }
1802
1803 static int __init intel_opregion_present(void)
1804 {
1805 int i915 = 0;
1806 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
1807 struct pci_dev *dev = NULL;
1808 u32 address;
1809
1810 for_each_pci_dev(dev) {
1811 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1812 continue;
1813 if (dev->vendor != PCI_VENDOR_ID_INTEL)
1814 continue;
1815 pci_read_config_dword(dev, 0xfc, &address);
1816 if (!address)
1817 continue;
1818 i915 = 1;
1819 }
1820 #endif
1821 return i915;
1822 }
1823
1824 int acpi_video_register(void)
1825 {
1826 int result = 0;
1827 if (register_count) {
1828 /*
1829 * if the function of acpi_video_register is already called,
1830 * don't register the acpi_vide_bus again and return no error.
1831 */
1832 return 0;
1833 }
1834
1835 result = acpi_bus_register_driver(&acpi_video_bus);
1836 if (result < 0)
1837 return -ENODEV;
1838
1839 /*
1840 * When the acpi_video_bus is loaded successfully, increase
1841 * the counter reference.
1842 */
1843 register_count = 1;
1844
1845 return 0;
1846 }
1847 EXPORT_SYMBOL(acpi_video_register);
1848
1849 void acpi_video_unregister(void)
1850 {
1851 if (!register_count) {
1852 /*
1853 * If the acpi video bus is already unloaded, don't
1854 * unload it again and return directly.
1855 */
1856 return;
1857 }
1858 acpi_bus_unregister_driver(&acpi_video_bus);
1859
1860 register_count = 0;
1861
1862 return;
1863 }
1864 EXPORT_SYMBOL(acpi_video_unregister);
1865
1866 /*
1867 * This is kind of nasty. Hardware using Intel chipsets may require
1868 * the video opregion code to be run first in order to initialise
1869 * state before any ACPI video calls are made. To handle this we defer
1870 * registration of the video class until the opregion code has run.
1871 */
1872
1873 static int __init acpi_video_init(void)
1874 {
1875 dmi_check_system(video_dmi_table);
1876
1877 if (intel_opregion_present())
1878 return 0;
1879
1880 return acpi_video_register();
1881 }
1882
1883 static void __exit acpi_video_exit(void)
1884 {
1885 acpi_video_unregister();
1886
1887 return;
1888 }
1889
1890 module_init(acpi_video_init);
1891 module_exit(acpi_video_exit);
Linux with added FPC-III support