?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
ARM: dma-mapping: Set arm_dma_set_mask() for iommu->set_dma_mask()
[linux-2.6.git] / drivers / acpi / video.c
blobac9a69cd45f5a4082a05c743de6dd58aad369c60
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 };
452
453 static int
454 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
455 unsigned long long *level, int init)
456 {
457 acpi_status status = AE_OK;
458 int i;
459
460 if (device->cap._BQC || device->cap._BCQ) {
461 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
462
463 status = acpi_evaluate_integer(device->dev->handle, buf,
464 NULL, level);
465 if (ACPI_SUCCESS(status)) {
466 if (device->brightness->flags._BQC_use_index) {
467 if (device->brightness->flags._BCL_reversed)
468 *level = device->brightness->count
469 - 3 - (*level);
470 *level = device->brightness->levels[*level + 2];
471
472 }
473 *level += bqc_offset_aml_bug_workaround;
474 for (i = 2; i < device->brightness->count; i++)
475 if (device->brightness->levels[i] == *level) {
476 device->brightness->curr = *level;
477 return 0;
478 }
479 if (!init) {
480 /*
481 * BQC returned an invalid level.
482 * Stop using it.
483 */
484 ACPI_WARNING((AE_INFO,
485 "%s returned an invalid level",
486 buf));
487 device->cap._BQC = device->cap._BCQ = 0;
488 }
489 } else {
490 /* Fixme:
491 * should we return an error or ignore this failure?
492 * dev->brightness->curr is a cached value which stores
493 * the correct current backlight level in most cases.
494 * ACPI video backlight still works w/ buggy _BQC.
495 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
496 */
497 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
498 device->cap._BQC = device->cap._BCQ = 0;
499 }
500 }
501
502 *level = device->brightness->curr;
503 return 0;
504 }
505
506 static int
507 acpi_video_device_EDID(struct acpi_video_device *device,
508 union acpi_object **edid, ssize_t length)
509 {
510 int status;
511 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
512 union acpi_object *obj;
513 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
514 struct acpi_object_list args = { 1, &arg0 };
515
516
517 *edid = NULL;
518
519 if (!device)
520 return -ENODEV;
521 if (length == 128)
522 arg0.integer.value = 1;
523 else if (length == 256)
524 arg0.integer.value = 2;
525 else
526 return -EINVAL;
527
528 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
529 if (ACPI_FAILURE(status))
530 return -ENODEV;
531
532 obj = buffer.pointer;
533
534 if (obj && obj->type == ACPI_TYPE_BUFFER)
535 *edid = obj;
536 else {
537 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
538 status = -EFAULT;
539 kfree(obj);
540 }
541
542 return status;
543 }
544
545 /* bus */
546
547 /*
548 * Arg:
549 * video : video bus device pointer
550 * bios_flag :
551 * 0. The system BIOS should NOT automatically switch(toggle)
552 * the active display output.
553 * 1. The system BIOS should automatically switch (toggle) the
554 * active display output. No switch event.
555 * 2. The _DGS value should be locked.
556 * 3. The system BIOS should not automatically switch (toggle) the
557 * active display output, but instead generate the display switch
558 * event notify code.
559 * lcd_flag :
560 * 0. The system BIOS should automatically control the brightness level
561 * of the LCD when the power changes from AC to DC
562 * 1. The system BIOS should NOT automatically control the brightness
563 * level of the LCD when the power changes from AC to DC.
564 * Return Value:
565 * -EINVAL wrong arg.
566 */
567
568 static int
569 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
570 {
571 acpi_status status;
572 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
573 struct acpi_object_list args = { 1, &arg0 };
574
575 if (!video->cap._DOS)
576 return 0;
577
578 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
579 return -EINVAL;
580 arg0.integer.value = (lcd_flag << 2) | bios_flag;
581 video->dos_setting = arg0.integer.value;
582 status = acpi_evaluate_object(video->device->handle, "_DOS",
583 &args, NULL);
584 if (ACPI_FAILURE(status))
585 return -EIO;
586
587 return 0;
588 }
589
590 /*
591 * Simple comparison function used to sort backlight levels.
592 */
593
594 static int
595 acpi_video_cmp_level(const void *a, const void *b)
596 {
597 return *(int *)a - *(int *)b;
598 }
599
600 /*
601 * Arg:
602 * device : video output device (LCD, CRT, ..)
603 *
604 * Return Value:
605 * Maximum brightness level
606 *
607 * Allocate and initialize device->brightness.
608 */
609
610 static int
611 acpi_video_init_brightness(struct acpi_video_device *device)
612 {
613 union acpi_object *obj = NULL;
614 int i, max_level = 0, count = 0, level_ac_battery = 0;
615 unsigned long long level, level_old;
616 union acpi_object *o;
617 struct acpi_video_device_brightness *br = NULL;
618 int result = -EINVAL;
619
620 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
621 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
622 "LCD brightness level\n"));
623 goto out;
624 }
625
626 if (obj->package.count < 2)
627 goto out;
628
629 br = kzalloc(sizeof(*br), GFP_KERNEL);
630 if (!br) {
631 printk(KERN_ERR "can't allocate memory\n");
632 result = -ENOMEM;
633 goto out;
634 }
635
636 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
637 GFP_KERNEL);
638 if (!br->levels) {
639 result = -ENOMEM;
640 goto out_free;
641 }
642
643 for (i = 0; i < obj->package.count; i++) {
644 o = (union acpi_object *)&obj->package.elements[i];
645 if (o->type != ACPI_TYPE_INTEGER) {
646 printk(KERN_ERR PREFIX "Invalid data\n");
647 continue;
648 }
649 br->levels[count] = (u32) o->integer.value;
650
651 if (br->levels[count] > max_level)
652 max_level = br->levels[count];
653 count++;
654 }
655
656 /*
657 * some buggy BIOS don't export the levels
658 * when machine is on AC/Battery in _BCL package.
659 * In this case, the first two elements in _BCL packages
660 * are also supported brightness levels that OS should take care of.
661 */
662 for (i = 2; i < count; i++) {
663 if (br->levels[i] == br->levels[0])
664 level_ac_battery++;
665 if (br->levels[i] == br->levels[1])
666 level_ac_battery++;
667 }
668
669 if (level_ac_battery < 2) {
670 level_ac_battery = 2 - level_ac_battery;
671 br->flags._BCL_no_ac_battery_levels = 1;
672 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
673 br->levels[i] = br->levels[i - level_ac_battery];
674 count += level_ac_battery;
675 } else if (level_ac_battery > 2)
676 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
677
678 /* Check if the _BCL package is in a reversed order */
679 if (max_level == br->levels[2]) {
680 br->flags._BCL_reversed = 1;
681 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
682 acpi_video_cmp_level, NULL);
683 } else if (max_level != br->levels[count - 1])
684 ACPI_ERROR((AE_INFO,
685 "Found unordered _BCL package\n"));
686
687 br->count = count;
688 device->brightness = br;
689
690 /* Check the input/output of _BQC/_BCL/_BCM */
691 if ((max_level < 100) && (max_level <= (count - 2)))
692 br->flags._BCL_use_index = 1;
693
694 /*
695 * _BCM is always consistent with _BCL,
696 * at least for all the laptops we have ever seen.
697 */
698 br->flags._BCM_use_index = br->flags._BCL_use_index;
699
700 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
701 br->curr = level = max_level;
702
703 if (!device->cap._BQC)
704 goto set_level;
705
706 result = acpi_video_device_lcd_get_level_current(device, &level_old, 1);
707 if (result)
708 goto out_free_levels;
709
710 /*
711 * Set the level to maximum and check if _BQC uses indexed value
712 */
713 result = acpi_video_device_lcd_set_level(device, max_level);
714 if (result)
715 goto out_free_levels;
716
717 result = acpi_video_device_lcd_get_level_current(device, &level, 0);
718 if (result)
719 goto out_free_levels;
720
721 br->flags._BQC_use_index = (level == max_level ? 0 : 1);
722
723 if (!br->flags._BQC_use_index) {
724 /*
725 * Set the backlight to the initial state.
726 * On some buggy laptops, _BQC returns an uninitialized value
727 * when invoked for the first time, i.e. level_old is invalid.
728 * set the backlight to max_level in this case
729 */
730 if (use_bios_initial_backlight) {
731 for (i = 2; i < br->count; i++)
732 if (level_old == br->levels[i])
733 level = level_old;
734 }
735 goto set_level;
736 }
737
738 if (br->flags._BCL_reversed)
739 level_old = (br->count - 1) - level_old;
740 level = br->levels[level_old];
741
742 set_level:
743 result = acpi_video_device_lcd_set_level(device, level);
744 if (result)
745 goto out_free_levels;
746
747 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
748 "found %d brightness levels\n", count - 2));
749 kfree(obj);
750 return result;
751
752 out_free_levels:
753 kfree(br->levels);
754 out_free:
755 kfree(br);
756 out:
757 device->brightness = NULL;
758 kfree(obj);
759 return result;
760 }
761
762 /*
763 * Arg:
764 * device : video output device (LCD, CRT, ..)
765 *
766 * Return Value:
767 * None
768 *
769 * Find out all required AML methods defined under the output
770 * device.
771 */
772
773 static void acpi_video_device_find_cap(struct acpi_video_device *device)
774 {
775 acpi_handle h_dummy1;
776
777 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
778 device->cap._ADR = 1;
779 }
780 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
781 device->cap._BCL = 1;
782 }
783 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
784 device->cap._BCM = 1;
785 }
786 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
787 device->cap._BQC = 1;
788 else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
789 &h_dummy1))) {
790 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
791 device->cap._BCQ = 1;
792 }
793
794 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
795 device->cap._DDC = 1;
796 }
797
798 if (acpi_video_backlight_support()) {
799 struct backlight_properties props;
800 struct pci_dev *pdev;
801 acpi_handle acpi_parent;
802 struct device *parent = NULL;
803 int result;
804 static int count = 0;
805 char *name;
806
807 result = acpi_video_init_brightness(device);
808 if (result)
809 return;
810 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
811 if (!name)
812 return;
813 count++;
814
815 acpi_get_parent(device->dev->handle, &acpi_parent);
816
817 pdev = acpi_get_pci_dev(acpi_parent);
818 if (pdev) {
819 parent = &pdev->dev;
820 pci_dev_put(pdev);
821 }
822
823 memset(&props, 0, sizeof(struct backlight_properties));
824 props.type = BACKLIGHT_FIRMWARE;
825 props.max_brightness = device->brightness->count - 3;
826 device->backlight = backlight_device_register(name,
827 parent,
828 device,
829 &acpi_backlight_ops,
830 &props);
831 kfree(name);
832 if (IS_ERR(device->backlight))
833 return;
834
835 /*
836 * Save current brightness level in case we have to restore it
837 * before acpi_video_device_lcd_set_level() is called next time.
838 */
839 device->backlight->props.brightness =
840 acpi_video_get_brightness(device->backlight);
841
842 device->cooling_dev = thermal_cooling_device_register("LCD",
843 device->dev, &video_cooling_ops);
844 if (IS_ERR(device->cooling_dev)) {
845 /*
846 * Set cooling_dev to NULL so we don't crash trying to
847 * free it.
848 * Also, why the hell we are returning early and
849 * not attempt to register video output if cooling
850 * device registration failed?
851 * -- dtor
852 */
853 device->cooling_dev = NULL;
854 return;
855 }
856
857 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
858 device->cooling_dev->id);
859 result = sysfs_create_link(&device->dev->dev.kobj,
860 &device->cooling_dev->device.kobj,
861 "thermal_cooling");
862 if (result)
863 printk(KERN_ERR PREFIX "Create sysfs link\n");
864 result = sysfs_create_link(&device->cooling_dev->device.kobj,
865 &device->dev->dev.kobj, "device");
866 if (result)
867 printk(KERN_ERR PREFIX "Create sysfs link\n");
868
869 }
870 }
871
872 /*
873 * Arg:
874 * device : video output device (VGA)
875 *
876 * Return Value:
877 * None
878 *
879 * Find out all required AML methods defined under the video bus device.
880 */
881
882 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
883 {
884 acpi_handle h_dummy1;
885
886 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
887 video->cap._DOS = 1;
888 }
889 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
890 video->cap._DOD = 1;
891 }
892 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
893 video->cap._ROM = 1;
894 }
895 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
896 video->cap._GPD = 1;
897 }
898 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
899 video->cap._SPD = 1;
900 }
901 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
902 video->cap._VPO = 1;
903 }
904 }
905
906 /*
907 * Check whether the video bus device has required AML method to
908 * support the desired features
909 */
910
911 static int acpi_video_bus_check(struct acpi_video_bus *video)
912 {
913 acpi_status status = -ENOENT;
914 struct pci_dev *dev;
915
916 if (!video)
917 return -EINVAL;
918
919 dev = acpi_get_pci_dev(video->device->handle);
920 if (!dev)
921 return -ENODEV;
922 pci_dev_put(dev);
923
924 /* Since there is no HID, CID and so on for VGA driver, we have
925 * to check well known required nodes.
926 */
927
928 /* Does this device support video switching? */
929 if (video->cap._DOS || video->cap._DOD) {
930 if (!video->cap._DOS) {
931 printk(KERN_WARNING FW_BUG
932 "ACPI(%s) defines _DOD but not _DOS\n",
933 acpi_device_bid(video->device));
934 }
935 video->flags.multihead = 1;
936 status = 0;
937 }
938
939 /* Does this device support retrieving a video ROM? */
940 if (video->cap._ROM) {
941 video->flags.rom = 1;
942 status = 0;
943 }
944
945 /* Does this device support configuring which video device to POST? */
946 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
947 video->flags.post = 1;
948 status = 0;
949 }
950
951 return status;
952 }
953
954 /* --------------------------------------------------------------------------
955 Driver Interface
956 -------------------------------------------------------------------------- */
957
958 /* device interface */
959 static struct acpi_video_device_attrib*
960 acpi_video_get_device_attr(struct acpi_video_bus *video, 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.attrib;
969 }
970
971 return NULL;
972 }
973
974 static int
975 acpi_video_get_device_type(struct acpi_video_bus *video,
976 unsigned long device_id)
977 {
978 struct acpi_video_enumerated_device *ids;
979 int i;
980
981 for (i = 0; i < video->attached_count; i++) {
982 ids = &video->attached_array[i];
983 if ((ids->value.int_val & 0xffff) == device_id)
984 return ids->value.int_val;
985 }
986
987 return 0;
988 }
989
990 static int
991 acpi_video_bus_get_one_device(struct acpi_device *device,
992 struct acpi_video_bus *video)
993 {
994 unsigned long long device_id;
995 int status, device_type;
996 struct acpi_video_device *data;
997 struct acpi_video_device_attrib* attribute;
998
999 if (!device || !video)
1000 return -EINVAL;
1001
1002 status =
1003 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1004 if (ACPI_SUCCESS(status)) {
1005
1006 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1007 if (!data)
1008 return -ENOMEM;
1009
1010 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1011 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1012 device->driver_data = data;
1013
1014 data->device_id = device_id;
1015 data->video = video;
1016 data->dev = device;
1017
1018 attribute = acpi_video_get_device_attr(video, device_id);
1019
1020 if((attribute != NULL) && attribute->device_id_scheme) {
1021 switch (attribute->display_type) {
1022 case ACPI_VIDEO_DISPLAY_CRT:
1023 data->flags.crt = 1;
1024 break;
1025 case ACPI_VIDEO_DISPLAY_TV:
1026 data->flags.tvout = 1;
1027 break;
1028 case ACPI_VIDEO_DISPLAY_DVI:
1029 data->flags.dvi = 1;
1030 break;
1031 case ACPI_VIDEO_DISPLAY_LCD:
1032 data->flags.lcd = 1;
1033 break;
1034 default:
1035 data->flags.unknown = 1;
1036 break;
1037 }
1038 if(attribute->bios_can_detect)
1039 data->flags.bios = 1;
1040 } else {
1041 /* Check for legacy IDs */
1042 device_type = acpi_video_get_device_type(video,
1043 device_id);
1044 /* Ignore bits 16 and 18-20 */
1045 switch (device_type & 0xffe2ffff) {
1046 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1047 data->flags.crt = 1;
1048 break;
1049 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1050 data->flags.lcd = 1;
1051 break;
1052 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1053 data->flags.tvout = 1;
1054 break;
1055 default:
1056 data->flags.unknown = 1;
1057 }
1058 }
1059
1060 acpi_video_device_bind(video, data);
1061 acpi_video_device_find_cap(data);
1062
1063 status = acpi_install_notify_handler(device->handle,
1064 ACPI_DEVICE_NOTIFY,
1065 acpi_video_device_notify,
1066 data);
1067 if (ACPI_FAILURE(status)) {
1068 printk(KERN_ERR PREFIX
1069 "Error installing notify handler\n");
1070 if(data->brightness)
1071 kfree(data->brightness->levels);
1072 kfree(data->brightness);
1073 kfree(data);
1074 return -ENODEV;
1075 }
1076
1077 mutex_lock(&video->device_list_lock);
1078 list_add_tail(&data->entry, &video->video_device_list);
1079 mutex_unlock(&video->device_list_lock);
1080
1081 return 0;
1082 }
1083
1084 return -ENOENT;
1085 }
1086
1087 /*
1088 * Arg:
1089 * video : video bus device
1090 *
1091 * Return:
1092 * none
1093 *
1094 * Enumerate the video device list of the video bus,
1095 * bind the ids with the corresponding video devices
1096 * under the video bus.
1097 */
1098
1099 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1100 {
1101 struct acpi_video_device *dev;
1102
1103 mutex_lock(&video->device_list_lock);
1104
1105 list_for_each_entry(dev, &video->video_device_list, entry)
1106 acpi_video_device_bind(video, dev);
1107
1108 mutex_unlock(&video->device_list_lock);
1109 }
1110
1111 /*
1112 * Arg:
1113 * video : video bus device
1114 * device : video output device under the video
1115 * bus
1116 *
1117 * Return:
1118 * none
1119 *
1120 * Bind the ids with the corresponding video devices
1121 * under the video bus.
1122 */
1123
1124 static void
1125 acpi_video_device_bind(struct acpi_video_bus *video,
1126 struct acpi_video_device *device)
1127 {
1128 struct acpi_video_enumerated_device *ids;
1129 int i;
1130
1131 for (i = 0; i < video->attached_count; i++) {
1132 ids = &video->attached_array[i];
1133 if (device->device_id == (ids->value.int_val & 0xffff)) {
1134 ids->bind_info = device;
1135 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1136 }
1137 }
1138 }
1139
1140 /*
1141 * Arg:
1142 * video : video bus device
1143 *
1144 * Return:
1145 * < 0 : error
1146 *
1147 * Call _DOD to enumerate all devices attached to display adapter
1148 *
1149 */
1150
1151 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1152 {
1153 int status;
1154 int count;
1155 int i;
1156 struct acpi_video_enumerated_device *active_list;
1157 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1158 union acpi_object *dod = NULL;
1159 union acpi_object *obj;
1160
1161 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1162 if (!ACPI_SUCCESS(status)) {
1163 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1164 return status;
1165 }
1166
1167 dod = buffer.pointer;
1168 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1169 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1170 status = -EFAULT;
1171 goto out;
1172 }
1173
1174 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1175 dod->package.count));
1176
1177 active_list = kcalloc(1 + dod->package.count,
1178 sizeof(struct acpi_video_enumerated_device),
1179 GFP_KERNEL);
1180 if (!active_list) {
1181 status = -ENOMEM;
1182 goto out;
1183 }
1184
1185 count = 0;
1186 for (i = 0; i < dod->package.count; i++) {
1187 obj = &dod->package.elements[i];
1188
1189 if (obj->type != ACPI_TYPE_INTEGER) {
1190 printk(KERN_ERR PREFIX
1191 "Invalid _DOD data in element %d\n", i);
1192 continue;
1193 }
1194
1195 active_list[count].value.int_val = obj->integer.value;
1196 active_list[count].bind_info = NULL;
1197 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1198 (int)obj->integer.value));
1199 count++;
1200 }
1201
1202 kfree(video->attached_array);
1203
1204 video->attached_array = active_list;
1205 video->attached_count = count;
1206
1207 out:
1208 kfree(buffer.pointer);
1209 return status;
1210 }
1211
1212 static int
1213 acpi_video_get_next_level(struct acpi_video_device *device,
1214 u32 level_current, u32 event)
1215 {
1216 int min, max, min_above, max_below, i, l, delta = 255;
1217 max = max_below = 0;
1218 min = min_above = 255;
1219 /* Find closest level to level_current */
1220 for (i = 2; i < device->brightness->count; i++) {
1221 l = device->brightness->levels[i];
1222 if (abs(l - level_current) < abs(delta)) {
1223 delta = l - level_current;
1224 if (!delta)
1225 break;
1226 }
1227 }
1228 /* Ajust level_current to closest available level */
1229 level_current += delta;
1230 for (i = 2; i < device->brightness->count; i++) {
1231 l = device->brightness->levels[i];
1232 if (l < min)
1233 min = l;
1234 if (l > max)
1235 max = l;
1236 if (l < min_above && l > level_current)
1237 min_above = l;
1238 if (l > max_below && l < level_current)
1239 max_below = l;
1240 }
1241
1242 switch (event) {
1243 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1244 return (level_current < max) ? min_above : min;
1245 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1246 return (level_current < max) ? min_above : max;
1247 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1248 return (level_current > min) ? max_below : min;
1249 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1250 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1251 return 0;
1252 default:
1253 return level_current;
1254 }
1255 }
1256
1257 static int
1258 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1259 {
1260 unsigned long long level_current, level_next;
1261 int result = -EINVAL;
1262
1263 /* no warning message if acpi_backlight=vendor is used */
1264 if (!acpi_video_backlight_support())
1265 return 0;
1266
1267 if (!device->brightness)
1268 goto out;
1269
1270 result = acpi_video_device_lcd_get_level_current(device,
1271 &level_current, 0);
1272 if (result)
1273 goto out;
1274
1275 level_next = acpi_video_get_next_level(device, level_current, event);
1276
1277 result = acpi_video_device_lcd_set_level(device, level_next);
1278
1279 if (!result)
1280 backlight_force_update(device->backlight,
1281 BACKLIGHT_UPDATE_HOTKEY);
1282
1283 out:
1284 if (result)
1285 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1286
1287 return result;
1288 }
1289
1290 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1291 void **edid)
1292 {
1293 struct acpi_video_bus *video;
1294 struct acpi_video_device *video_device;
1295 union acpi_object *buffer = NULL;
1296 acpi_status status;
1297 int i, length;
1298
1299 if (!device || !acpi_driver_data(device))
1300 return -EINVAL;
1301
1302 video = acpi_driver_data(device);
1303
1304 for (i = 0; i < video->attached_count; i++) {
1305 video_device = video->attached_array[i].bind_info;
1306 length = 256;
1307
1308 if (!video_device)
1309 continue;
1310
1311 if (!video_device->cap._DDC)
1312 continue;
1313
1314 if (type) {
1315 switch (type) {
1316 case ACPI_VIDEO_DISPLAY_CRT:
1317 if (!video_device->flags.crt)
1318 continue;
1319 break;
1320 case ACPI_VIDEO_DISPLAY_TV:
1321 if (!video_device->flags.tvout)
1322 continue;
1323 break;
1324 case ACPI_VIDEO_DISPLAY_DVI:
1325 if (!video_device->flags.dvi)
1326 continue;
1327 break;
1328 case ACPI_VIDEO_DISPLAY_LCD:
1329 if (!video_device->flags.lcd)
1330 continue;
1331 break;
1332 }
1333 } else if (video_device->device_id != device_id) {
1334 continue;
1335 }
1336
1337 status = acpi_video_device_EDID(video_device, &buffer, length);
1338
1339 if (ACPI_FAILURE(status) || !buffer ||
1340 buffer->type != ACPI_TYPE_BUFFER) {
1341 length = 128;
1342 status = acpi_video_device_EDID(video_device, &buffer,
1343 length);
1344 if (ACPI_FAILURE(status) || !buffer ||
1345 buffer->type != ACPI_TYPE_BUFFER) {
1346 continue;
1347 }
1348 }
1349
1350 *edid = buffer->buffer.pointer;
1351 return length;
1352 }
1353
1354 return -ENODEV;
1355 }
1356 EXPORT_SYMBOL(acpi_video_get_edid);
1357
1358 static int
1359 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1360 struct acpi_device *device)
1361 {
1362 int status = 0;
1363 struct acpi_device *dev;
1364
1365 /*
1366 * There are systems where video module known to work fine regardless
1367 * of broken _DOD and ignoring returned value here doesn't cause
1368 * any issues later.
1369 */
1370 acpi_video_device_enumerate(video);
1371
1372 list_for_each_entry(dev, &device->children, node) {
1373
1374 status = acpi_video_bus_get_one_device(dev, video);
1375 if (status) {
1376 printk(KERN_WARNING PREFIX
1377 "Can't attach device\n");
1378 continue;
1379 }
1380 }
1381 return status;
1382 }
1383
1384 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1385 {
1386 acpi_status status;
1387
1388 if (!device || !device->video)
1389 return -ENOENT;
1390
1391 status = acpi_remove_notify_handler(device->dev->handle,
1392 ACPI_DEVICE_NOTIFY,
1393 acpi_video_device_notify);
1394 if (ACPI_FAILURE(status)) {
1395 printk(KERN_WARNING PREFIX
1396 "Can't remove video notify handler\n");
1397 }
1398 if (device->backlight) {
1399 backlight_device_unregister(device->backlight);
1400 device->backlight = NULL;
1401 }
1402 if (device->cooling_dev) {
1403 sysfs_remove_link(&device->dev->dev.kobj,
1404 "thermal_cooling");
1405 sysfs_remove_link(&device->cooling_dev->device.kobj,
1406 "device");
1407 thermal_cooling_device_unregister(device->cooling_dev);
1408 device->cooling_dev = NULL;
1409 }
1410
1411 return 0;
1412 }
1413
1414 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1415 {
1416 int status;
1417 struct acpi_video_device *dev, *next;
1418
1419 mutex_lock(&video->device_list_lock);
1420
1421 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1422
1423 status = acpi_video_bus_put_one_device(dev);
1424 if (ACPI_FAILURE(status))
1425 printk(KERN_WARNING PREFIX
1426 "hhuuhhuu bug in acpi video driver.\n");
1427
1428 if (dev->brightness) {
1429 kfree(dev->brightness->levels);
1430 kfree(dev->brightness);
1431 }
1432 list_del(&dev->entry);
1433 kfree(dev);
1434 }
1435
1436 mutex_unlock(&video->device_list_lock);
1437
1438 return 0;
1439 }
1440
1441 /* acpi_video interface */
1442
1443 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1444 {
1445 return acpi_video_bus_DOS(video, 0, 0);
1446 }
1447
1448 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1449 {
1450 return acpi_video_bus_DOS(video, 0, 1);
1451 }
1452
1453 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1454 {
1455 struct acpi_video_bus *video = acpi_driver_data(device);
1456 struct input_dev *input;
1457 int keycode = 0;
1458
1459 if (!video)
1460 return;
1461
1462 input = video->input;
1463
1464 switch (event) {
1465 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1466 * most likely via hotkey. */
1467 acpi_bus_generate_proc_event(device, event, 0);
1468 keycode = KEY_SWITCHVIDEOMODE;
1469 break;
1470
1471 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1472 * connector. */
1473 acpi_video_device_enumerate(video);
1474 acpi_video_device_rebind(video);
1475 acpi_bus_generate_proc_event(device, event, 0);
1476 keycode = KEY_SWITCHVIDEOMODE;
1477 break;
1478
1479 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1480 acpi_bus_generate_proc_event(device, event, 0);
1481 keycode = KEY_SWITCHVIDEOMODE;
1482 break;
1483 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1484 acpi_bus_generate_proc_event(device, event, 0);
1485 keycode = KEY_VIDEO_NEXT;
1486 break;
1487 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1488 acpi_bus_generate_proc_event(device, event, 0);
1489 keycode = KEY_VIDEO_PREV;
1490 break;
1491
1492 default:
1493 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1494 "Unsupported event [0x%x]\n", event));
1495 break;
1496 }
1497
1498 if (acpi_notifier_call_chain(device, event, 0))
1499 /* Something vetoed the keypress. */
1500 keycode = 0;
1501
1502 if (keycode) {
1503 input_report_key(input, keycode, 1);
1504 input_sync(input);
1505 input_report_key(input, keycode, 0);
1506 input_sync(input);
1507 }
1508
1509 return;
1510 }
1511
1512 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1513 {
1514 struct acpi_video_device *video_device = data;
1515 struct acpi_device *device = NULL;
1516 struct acpi_video_bus *bus;
1517 struct input_dev *input;
1518 int keycode = 0;
1519
1520 if (!video_device)
1521 return;
1522
1523 device = video_device->dev;
1524 bus = video_device->video;
1525 input = bus->input;
1526
1527 switch (event) {
1528 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1529 if (brightness_switch_enabled)
1530 acpi_video_switch_brightness(video_device, event);
1531 acpi_bus_generate_proc_event(device, event, 0);
1532 keycode = KEY_BRIGHTNESS_CYCLE;
1533 break;
1534 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1535 if (brightness_switch_enabled)
1536 acpi_video_switch_brightness(video_device, event);
1537 acpi_bus_generate_proc_event(device, event, 0);
1538 keycode = KEY_BRIGHTNESSUP;
1539 break;
1540 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1541 if (brightness_switch_enabled)
1542 acpi_video_switch_brightness(video_device, event);
1543 acpi_bus_generate_proc_event(device, event, 0);
1544 keycode = KEY_BRIGHTNESSDOWN;
1545 break;
1546 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1547 if (brightness_switch_enabled)
1548 acpi_video_switch_brightness(video_device, event);
1549 acpi_bus_generate_proc_event(device, event, 0);
1550 keycode = KEY_BRIGHTNESS_ZERO;
1551 break;
1552 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1553 if (brightness_switch_enabled)
1554 acpi_video_switch_brightness(video_device, event);
1555 acpi_bus_generate_proc_event(device, event, 0);
1556 keycode = KEY_DISPLAY_OFF;
1557 break;
1558 default:
1559 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1560 "Unsupported event [0x%x]\n", event));
1561 break;
1562 }
1563
1564 acpi_notifier_call_chain(device, event, 0);
1565
1566 if (keycode) {
1567 input_report_key(input, keycode, 1);
1568 input_sync(input);
1569 input_report_key(input, keycode, 0);
1570 input_sync(input);
1571 }
1572
1573 return;
1574 }
1575
1576 static int acpi_video_resume(struct notifier_block *nb,
1577 unsigned long val, void *ign)
1578 {
1579 struct acpi_video_bus *video;
1580 struct acpi_video_device *video_device;
1581 int i;
1582
1583 switch (val) {
1584 case PM_HIBERNATION_PREPARE:
1585 case PM_SUSPEND_PREPARE:
1586 case PM_RESTORE_PREPARE:
1587 return NOTIFY_DONE;
1588 }
1589
1590 video = container_of(nb, struct acpi_video_bus, pm_nb);
1591
1592 dev_info(&video->device->dev, "Restoring backlight state\n");
1593
1594 for (i = 0; i < video->attached_count; i++) {
1595 video_device = video->attached_array[i].bind_info;
1596 if (video_device && video_device->backlight)
1597 acpi_video_set_brightness(video_device->backlight);
1598 }
1599
1600 return NOTIFY_OK;
1601 }
1602
1603 static acpi_status
1604 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1605 void **return_value)
1606 {
1607 struct acpi_device *device = context;
1608 struct acpi_device *sibling;
1609 int result;
1610
1611 if (handle == device->handle)
1612 return AE_CTRL_TERMINATE;
1613
1614 result = acpi_bus_get_device(handle, &sibling);
1615 if (result)
1616 return AE_OK;
1617
1618 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1619 return AE_ALREADY_EXISTS;
1620
1621 return AE_OK;
1622 }
1623
1624 static int instance;
1625
1626 static int acpi_video_bus_add(struct acpi_device *device)
1627 {
1628 struct acpi_video_bus *video;
1629 struct input_dev *input;
1630 int error;
1631 acpi_status status;
1632
1633 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1634 device->parent->handle, 1,
1635 acpi_video_bus_match, NULL,
1636 device, NULL);
1637 if (status == AE_ALREADY_EXISTS) {
1638 printk(KERN_WARNING FW_BUG
1639 "Duplicate ACPI video bus devices for the"
1640 " same VGA controller, please try module "
1641 "parameter \"video.allow_duplicates=1\""
1642 "if the current driver doesn't work.\n");
1643 if (!allow_duplicates)
1644 return -ENODEV;
1645 }
1646
1647 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1648 if (!video)
1649 return -ENOMEM;
1650
1651 /* a hack to fix the duplicate name "VID" problem on T61 */
1652 if (!strcmp(device->pnp.bus_id, "VID")) {
1653 if (instance)
1654 device->pnp.bus_id[3] = '0' + instance;
1655 instance ++;
1656 }
1657 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1658 if (!strcmp(device->pnp.bus_id, "VGA")) {
1659 if (instance)
1660 device->pnp.bus_id[3] = '0' + instance;
1661 instance++;
1662 }
1663
1664 video->device = device;
1665 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1666 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1667 device->driver_data = video;
1668
1669 acpi_video_bus_find_cap(video);
1670 error = acpi_video_bus_check(video);
1671 if (error)
1672 goto err_free_video;
1673
1674 mutex_init(&video->device_list_lock);
1675 INIT_LIST_HEAD(&video->video_device_list);
1676
1677 error = acpi_video_bus_get_devices(video, device);
1678 if (error)
1679 goto err_free_video;
1680
1681 video->input = input = input_allocate_device();
1682 if (!input) {
1683 error = -ENOMEM;
1684 goto err_put_video;
1685 }
1686
1687 error = acpi_video_bus_start_devices(video);
1688 if (error)
1689 goto err_free_input_dev;
1690
1691 snprintf(video->phys, sizeof(video->phys),
1692 "%s/video/input0", acpi_device_hid(video->device));
1693
1694 input->name = acpi_device_name(video->device);
1695 input->phys = video->phys;
1696 input->id.bustype = BUS_HOST;
1697 input->id.product = 0x06;
1698 input->dev.parent = &device->dev;
1699 input->evbit[0] = BIT(EV_KEY);
1700 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1701 set_bit(KEY_VIDEO_NEXT, input->keybit);
1702 set_bit(KEY_VIDEO_PREV, input->keybit);
1703 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1704 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1705 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1706 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1707 set_bit(KEY_DISPLAY_OFF, input->keybit);
1708
1709 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
1710 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1711 video->flags.multihead ? "yes" : "no",
1712 video->flags.rom ? "yes" : "no",
1713 video->flags.post ? "yes" : "no");
1714
1715 video->pm_nb.notifier_call = acpi_video_resume;
1716 video->pm_nb.priority = 0;
1717 error = register_pm_notifier(&video->pm_nb);
1718 if (error)
1719 goto err_stop_video;
1720
1721 error = input_register_device(input);
1722 if (error)
1723 goto err_unregister_pm_notifier;
1724
1725 return 0;
1726
1727 err_unregister_pm_notifier:
1728 unregister_pm_notifier(&video->pm_nb);
1729 err_stop_video:
1730 acpi_video_bus_stop_devices(video);
1731 err_free_input_dev:
1732 input_free_device(input);
1733 err_put_video:
1734 acpi_video_bus_put_devices(video);
1735 kfree(video->attached_array);
1736 err_free_video:
1737 kfree(video);
1738 device->driver_data = NULL;
1739
1740 return error;
1741 }
1742
1743 static int acpi_video_bus_remove(struct acpi_device *device, int type)
1744 {
1745 struct acpi_video_bus *video = NULL;
1746
1747
1748 if (!device || !acpi_driver_data(device))
1749 return -EINVAL;
1750
1751 video = acpi_driver_data(device);
1752
1753 unregister_pm_notifier(&video->pm_nb);
1754
1755 acpi_video_bus_stop_devices(video);
1756 acpi_video_bus_put_devices(video);
1757
1758 input_unregister_device(video->input);
1759 kfree(video->attached_array);
1760 kfree(video);
1761
1762 return 0;
1763 }
1764
1765 static int __init is_i740(struct pci_dev *dev)
1766 {
1767 if (dev->device == 0x00D1)
1768 return 1;
1769 if (dev->device == 0x7000)
1770 return 1;
1771 return 0;
1772 }
1773
1774 static int __init intel_opregion_present(void)
1775 {
1776 int opregion = 0;
1777 struct pci_dev *dev = NULL;
1778 u32 address;
1779
1780 for_each_pci_dev(dev) {
1781 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1782 continue;
1783 if (dev->vendor != PCI_VENDOR_ID_INTEL)
1784 continue;
1785 /* We don't want to poke around undefined i740 registers */
1786 if (is_i740(dev))
1787 continue;
1788 pci_read_config_dword(dev, 0xfc, &address);
1789 if (!address)
1790 continue;
1791 opregion = 1;
1792 }
1793 return opregion;
1794 }
1795
1796 int acpi_video_register(void)
1797 {
1798 int result = 0;
1799 if (register_count) {
1800 /*
1801 * if the function of acpi_video_register is already called,
1802 * don't register the acpi_vide_bus again and return no error.
1803 */
1804 return 0;
1805 }
1806
1807 result = acpi_bus_register_driver(&acpi_video_bus);
1808 if (result < 0)
1809 return -ENODEV;
1810
1811 /*
1812 * When the acpi_video_bus is loaded successfully, increase
1813 * the counter reference.
1814 */
1815 register_count = 1;
1816
1817 return 0;
1818 }
1819 EXPORT_SYMBOL(acpi_video_register);
1820
1821 void acpi_video_unregister(void)
1822 {
1823 if (!register_count) {
1824 /*
1825 * If the acpi video bus is already unloaded, don't
1826 * unload it again and return directly.
1827 */
1828 return;
1829 }
1830 acpi_bus_unregister_driver(&acpi_video_bus);
1831
1832 register_count = 0;
1833
1834 return;
1835 }
1836 EXPORT_SYMBOL(acpi_video_unregister);
1837
1838 /*
1839 * This is kind of nasty. Hardware using Intel chipsets may require
1840 * the video opregion code to be run first in order to initialise
1841 * state before any ACPI video calls are made. To handle this we defer
1842 * registration of the video class until the opregion code has run.
1843 */
1844
1845 static int __init acpi_video_init(void)
1846 {
1847 dmi_check_system(video_dmi_table);
1848
1849 if (intel_opregion_present())
1850 return 0;
1851
1852 return acpi_video_register();
1853 }
1854
1855 static void __exit acpi_video_exit(void)
1856 {
1857 acpi_video_unregister();
1858
1859 return;
1860 }
1861
1862 module_init(acpi_video_init);
1863 module_exit(acpi_video_exit);
Linus' kernel tree