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Adding support for MOXA ART SoC. Testing port of linux-2.6.32.60-moxart.
[linux-3.6.7-moxart.git] / drivers / acpi / video.c
blob1e0a9e17c31d805a201e8dbcbf7933efe8eec111
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 struct dmi_system_id video_dmi_table[] __initdata = {
393 /*
394 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
395 */
396 {
397 .callback = video_set_bqc_offset,
398 .ident = "Acer Aspire 5720",
399 .matches = {
400 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
401 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
402 },
403 },
404 {
405 .callback = video_set_bqc_offset,
406 .ident = "Acer Aspire 5710Z",
407 .matches = {
408 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
409 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
410 },
411 },
412 {
413 .callback = video_set_bqc_offset,
414 .ident = "eMachines E510",
415 .matches = {
416 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
417 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
418 },
419 },
420 {
421 .callback = video_set_bqc_offset,
422 .ident = "Acer Aspire 5315",
423 .matches = {
424 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
425 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
426 },
427 },
428 {
429 .callback = video_set_bqc_offset,
430 .ident = "Acer Aspire 7720",
431 .matches = {
432 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
433 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
434 },
435 },
436 {}
437 };
438
439 static int
440 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
441 unsigned long long *level, int init)
442 {
443 acpi_status status = AE_OK;
444 int i;
445
446 if (device->cap._BQC || device->cap._BCQ) {
447 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
448
449 status = acpi_evaluate_integer(device->dev->handle, buf,
450 NULL, level);
451 if (ACPI_SUCCESS(status)) {
452 if (device->brightness->flags._BQC_use_index) {
453 if (device->brightness->flags._BCL_reversed)
454 *level = device->brightness->count
455 - 3 - (*level);
456 *level = device->brightness->levels[*level + 2];
457
458 }
459 *level += bqc_offset_aml_bug_workaround;
460 for (i = 2; i < device->brightness->count; i++)
461 if (device->brightness->levels[i] == *level) {
462 device->brightness->curr = *level;
463 return 0;
464 }
465 if (!init) {
466 /*
467 * BQC returned an invalid level.
468 * Stop using it.
469 */
470 ACPI_WARNING((AE_INFO,
471 "%s returned an invalid level",
472 buf));
473 device->cap._BQC = device->cap._BCQ = 0;
474 }
475 } else {
476 /* Fixme:
477 * should we return an error or ignore this failure?
478 * dev->brightness->curr is a cached value which stores
479 * the correct current backlight level in most cases.
480 * ACPI video backlight still works w/ buggy _BQC.
481 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
482 */
483 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
484 device->cap._BQC = device->cap._BCQ = 0;
485 }
486 }
487
488 *level = device->brightness->curr;
489 return 0;
490 }
491
492 static int
493 acpi_video_device_EDID(struct acpi_video_device *device,
494 union acpi_object **edid, ssize_t length)
495 {
496 int status;
497 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
498 union acpi_object *obj;
499 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
500 struct acpi_object_list args = { 1, &arg0 };
501
502
503 *edid = NULL;
504
505 if (!device)
506 return -ENODEV;
507 if (length == 128)
508 arg0.integer.value = 1;
509 else if (length == 256)
510 arg0.integer.value = 2;
511 else
512 return -EINVAL;
513
514 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
515 if (ACPI_FAILURE(status))
516 return -ENODEV;
517
518 obj = buffer.pointer;
519
520 if (obj && obj->type == ACPI_TYPE_BUFFER)
521 *edid = obj;
522 else {
523 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
524 status = -EFAULT;
525 kfree(obj);
526 }
527
528 return status;
529 }
530
531 /* bus */
532
533 /*
534 * Arg:
535 * video : video bus device pointer
536 * bios_flag :
537 * 0. The system BIOS should NOT automatically switch(toggle)
538 * the active display output.
539 * 1. The system BIOS should automatically switch (toggle) the
540 * active display output. No switch event.
541 * 2. The _DGS value should be locked.
542 * 3. The system BIOS should not automatically switch (toggle) the
543 * active display output, but instead generate the display switch
544 * event notify code.
545 * lcd_flag :
546 * 0. The system BIOS should automatically control the brightness level
547 * of the LCD when the power changes from AC to DC
548 * 1. The system BIOS should NOT automatically control the brightness
549 * level of the LCD when the power changes from AC to DC.
550 * Return Value:
551 * -EINVAL wrong arg.
552 */
553
554 static int
555 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
556 {
557 acpi_status status;
558 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
559 struct acpi_object_list args = { 1, &arg0 };
560
561 if (!video->cap._DOS)
562 return 0;
563
564 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
565 return -EINVAL;
566 arg0.integer.value = (lcd_flag << 2) | bios_flag;
567 video->dos_setting = arg0.integer.value;
568 status = acpi_evaluate_object(video->device->handle, "_DOS",
569 &args, NULL);
570 if (ACPI_FAILURE(status))
571 return -EIO;
572
573 return 0;
574 }
575
576 /*
577 * Simple comparison function used to sort backlight levels.
578 */
579
580 static int
581 acpi_video_cmp_level(const void *a, const void *b)
582 {
583 return *(int *)a - *(int *)b;
584 }
585
586 /*
587 * Arg:
588 * device : video output device (LCD, CRT, ..)
589 *
590 * Return Value:
591 * Maximum brightness level
592 *
593 * Allocate and initialize device->brightness.
594 */
595
596 static int
597 acpi_video_init_brightness(struct acpi_video_device *device)
598 {
599 union acpi_object *obj = NULL;
600 int i, max_level = 0, count = 0, level_ac_battery = 0;
601 unsigned long long level, level_old;
602 union acpi_object *o;
603 struct acpi_video_device_brightness *br = NULL;
604 int result = -EINVAL;
605
606 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
607 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
608 "LCD brightness level\n"));
609 goto out;
610 }
611
612 if (obj->package.count < 2)
613 goto out;
614
615 br = kzalloc(sizeof(*br), GFP_KERNEL);
616 if (!br) {
617 printk(KERN_ERR "can't allocate memory\n");
618 result = -ENOMEM;
619 goto out;
620 }
621
622 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
623 GFP_KERNEL);
624 if (!br->levels) {
625 result = -ENOMEM;
626 goto out_free;
627 }
628
629 for (i = 0; i < obj->package.count; i++) {
630 o = (union acpi_object *)&obj->package.elements[i];
631 if (o->type != ACPI_TYPE_INTEGER) {
632 printk(KERN_ERR PREFIX "Invalid data\n");
633 continue;
634 }
635 br->levels[count] = (u32) o->integer.value;
636
637 if (br->levels[count] > max_level)
638 max_level = br->levels[count];
639 count++;
640 }
641
642 /*
643 * some buggy BIOS don't export the levels
644 * when machine is on AC/Battery in _BCL package.
645 * In this case, the first two elements in _BCL packages
646 * are also supported brightness levels that OS should take care of.
647 */
648 for (i = 2; i < count; i++) {
649 if (br->levels[i] == br->levels[0])
650 level_ac_battery++;
651 if (br->levels[i] == br->levels[1])
652 level_ac_battery++;
653 }
654
655 if (level_ac_battery < 2) {
656 level_ac_battery = 2 - level_ac_battery;
657 br->flags._BCL_no_ac_battery_levels = 1;
658 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
659 br->levels[i] = br->levels[i - level_ac_battery];
660 count += level_ac_battery;
661 } else if (level_ac_battery > 2)
662 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
663
664 /* Check if the _BCL package is in a reversed order */
665 if (max_level == br->levels[2]) {
666 br->flags._BCL_reversed = 1;
667 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
668 acpi_video_cmp_level, NULL);
669 } else if (max_level != br->levels[count - 1])
670 ACPI_ERROR((AE_INFO,
671 "Found unordered _BCL package\n"));
672
673 br->count = count;
674 device->brightness = br;
675
676 /* Check the input/output of _BQC/_BCL/_BCM */
677 if ((max_level < 100) && (max_level <= (count - 2)))
678 br->flags._BCL_use_index = 1;
679
680 /*
681 * _BCM is always consistent with _BCL,
682 * at least for all the laptops we have ever seen.
683 */
684 br->flags._BCM_use_index = br->flags._BCL_use_index;
685
686 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
687 br->curr = level = max_level;
688
689 if (!device->cap._BQC)
690 goto set_level;
691
692 result = acpi_video_device_lcd_get_level_current(device, &level_old, 1);
693 if (result)
694 goto out_free_levels;
695
696 /*
697 * Set the level to maximum and check if _BQC uses indexed value
698 */
699 result = acpi_video_device_lcd_set_level(device, max_level);
700 if (result)
701 goto out_free_levels;
702
703 result = acpi_video_device_lcd_get_level_current(device, &level, 0);
704 if (result)
705 goto out_free_levels;
706
707 br->flags._BQC_use_index = (level == max_level ? 0 : 1);
708
709 if (!br->flags._BQC_use_index) {
710 /*
711 * Set the backlight to the initial state.
712 * On some buggy laptops, _BQC returns an uninitialized value
713 * when invoked for the first time, i.e. level_old is invalid.
714 * set the backlight to max_level in this case
715 */
716 if (use_bios_initial_backlight) {
717 for (i = 2; i < br->count; i++)
718 if (level_old == br->levels[i])
719 level = level_old;
720 }
721 goto set_level;
722 }
723
724 if (br->flags._BCL_reversed)
725 level_old = (br->count - 1) - level_old;
726 level = br->levels[level_old];
727
728 set_level:
729 result = acpi_video_device_lcd_set_level(device, level);
730 if (result)
731 goto out_free_levels;
732
733 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
734 "found %d brightness levels\n", count - 2));
735 kfree(obj);
736 return result;
737
738 out_free_levels:
739 kfree(br->levels);
740 out_free:
741 kfree(br);
742 out:
743 device->brightness = NULL;
744 kfree(obj);
745 return result;
746 }
747
748 /*
749 * Arg:
750 * device : video output device (LCD, CRT, ..)
751 *
752 * Return Value:
753 * None
754 *
755 * Find out all required AML methods defined under the output
756 * device.
757 */
758
759 static void acpi_video_device_find_cap(struct acpi_video_device *device)
760 {
761 acpi_handle h_dummy1;
762
763 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
764 device->cap._ADR = 1;
765 }
766 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
767 device->cap._BCL = 1;
768 }
769 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
770 device->cap._BCM = 1;
771 }
772 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
773 device->cap._BQC = 1;
774 else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
775 &h_dummy1))) {
776 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
777 device->cap._BCQ = 1;
778 }
779
780 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
781 device->cap._DDC = 1;
782 }
783
784 if (acpi_video_backlight_support()) {
785 struct backlight_properties props;
786 struct pci_dev *pdev;
787 acpi_handle acpi_parent;
788 struct device *parent = NULL;
789 int result;
790 static int count = 0;
791 char *name;
792
793 result = acpi_video_init_brightness(device);
794 if (result)
795 return;
796 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
797 if (!name)
798 return;
799 count++;
800
801 acpi_get_parent(device->dev->handle, &acpi_parent);
802
803 pdev = acpi_get_pci_dev(acpi_parent);
804 if (pdev) {
805 parent = &pdev->dev;
806 pci_dev_put(pdev);
807 }
808
809 memset(&props, 0, sizeof(struct backlight_properties));
810 props.type = BACKLIGHT_FIRMWARE;
811 props.max_brightness = device->brightness->count - 3;
812 device->backlight = backlight_device_register(name,
813 parent,
814 device,
815 &acpi_backlight_ops,
816 &props);
817 kfree(name);
818 if (IS_ERR(device->backlight))
819 return;
820
821 /*
822 * Save current brightness level in case we have to restore it
823 * before acpi_video_device_lcd_set_level() is called next time.
824 */
825 device->backlight->props.brightness =
826 acpi_video_get_brightness(device->backlight);
827
828 device->cooling_dev = thermal_cooling_device_register("LCD",
829 device->dev, &video_cooling_ops);
830 if (IS_ERR(device->cooling_dev)) {
831 /*
832 * Set cooling_dev to NULL so we don't crash trying to
833 * free it.
834 * Also, why the hell we are returning early and
835 * not attempt to register video output if cooling
836 * device registration failed?
837 * -- dtor
838 */
839 device->cooling_dev = NULL;
840 return;
841 }
842
843 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
844 device->cooling_dev->id);
845 result = sysfs_create_link(&device->dev->dev.kobj,
846 &device->cooling_dev->device.kobj,
847 "thermal_cooling");
848 if (result)
849 printk(KERN_ERR PREFIX "Create sysfs link\n");
850 result = sysfs_create_link(&device->cooling_dev->device.kobj,
851 &device->dev->dev.kobj, "device");
852 if (result)
853 printk(KERN_ERR PREFIX "Create sysfs link\n");
854
855 }
856 }
857
858 /*
859 * Arg:
860 * device : video output device (VGA)
861 *
862 * Return Value:
863 * None
864 *
865 * Find out all required AML methods defined under the video bus device.
866 */
867
868 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
869 {
870 acpi_handle h_dummy1;
871
872 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
873 video->cap._DOS = 1;
874 }
875 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
876 video->cap._DOD = 1;
877 }
878 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
879 video->cap._ROM = 1;
880 }
881 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
882 video->cap._GPD = 1;
883 }
884 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
885 video->cap._SPD = 1;
886 }
887 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
888 video->cap._VPO = 1;
889 }
890 }
891
892 /*
893 * Check whether the video bus device has required AML method to
894 * support the desired features
895 */
896
897 static int acpi_video_bus_check(struct acpi_video_bus *video)
898 {
899 acpi_status status = -ENOENT;
900 struct pci_dev *dev;
901
902 if (!video)
903 return -EINVAL;
904
905 dev = acpi_get_pci_dev(video->device->handle);
906 if (!dev)
907 return -ENODEV;
908 pci_dev_put(dev);
909
910 /* Since there is no HID, CID and so on for VGA driver, we have
911 * to check well known required nodes.
912 */
913
914 /* Does this device support video switching? */
915 if (video->cap._DOS || video->cap._DOD) {
916 if (!video->cap._DOS) {
917 printk(KERN_WARNING FW_BUG
918 "ACPI(%s) defines _DOD but not _DOS\n",
919 acpi_device_bid(video->device));
920 }
921 video->flags.multihead = 1;
922 status = 0;
923 }
924
925 /* Does this device support retrieving a video ROM? */
926 if (video->cap._ROM) {
927 video->flags.rom = 1;
928 status = 0;
929 }
930
931 /* Does this device support configuring which video device to POST? */
932 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
933 video->flags.post = 1;
934 status = 0;
935 }
936
937 return status;
938 }
939
940 /* --------------------------------------------------------------------------
941 Driver Interface
942 -------------------------------------------------------------------------- */
943
944 /* device interface */
945 static struct acpi_video_device_attrib*
946 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
947 {
948 struct acpi_video_enumerated_device *ids;
949 int i;
950
951 for (i = 0; i < video->attached_count; i++) {
952 ids = &video->attached_array[i];
953 if ((ids->value.int_val & 0xffff) == device_id)
954 return &ids->value.attrib;
955 }
956
957 return NULL;
958 }
959
960 static int
961 acpi_video_get_device_type(struct acpi_video_bus *video,
962 unsigned long device_id)
963 {
964 struct acpi_video_enumerated_device *ids;
965 int i;
966
967 for (i = 0; i < video->attached_count; i++) {
968 ids = &video->attached_array[i];
969 if ((ids->value.int_val & 0xffff) == device_id)
970 return ids->value.int_val;
971 }
972
973 return 0;
974 }
975
976 static int
977 acpi_video_bus_get_one_device(struct acpi_device *device,
978 struct acpi_video_bus *video)
979 {
980 unsigned long long device_id;
981 int status, device_type;
982 struct acpi_video_device *data;
983 struct acpi_video_device_attrib* attribute;
984
985 if (!device || !video)
986 return -EINVAL;
987
988 status =
989 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
990 if (ACPI_SUCCESS(status)) {
991
992 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
993 if (!data)
994 return -ENOMEM;
995
996 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
997 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
998 device->driver_data = data;
999
1000 data->device_id = device_id;
1001 data->video = video;
1002 data->dev = device;
1003
1004 attribute = acpi_video_get_device_attr(video, device_id);
1005
1006 if((attribute != NULL) && attribute->device_id_scheme) {
1007 switch (attribute->display_type) {
1008 case ACPI_VIDEO_DISPLAY_CRT:
1009 data->flags.crt = 1;
1010 break;
1011 case ACPI_VIDEO_DISPLAY_TV:
1012 data->flags.tvout = 1;
1013 break;
1014 case ACPI_VIDEO_DISPLAY_DVI:
1015 data->flags.dvi = 1;
1016 break;
1017 case ACPI_VIDEO_DISPLAY_LCD:
1018 data->flags.lcd = 1;
1019 break;
1020 default:
1021 data->flags.unknown = 1;
1022 break;
1023 }
1024 if(attribute->bios_can_detect)
1025 data->flags.bios = 1;
1026 } else {
1027 /* Check for legacy IDs */
1028 device_type = acpi_video_get_device_type(video,
1029 device_id);
1030 /* Ignore bits 16 and 18-20 */
1031 switch (device_type & 0xffe2ffff) {
1032 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1033 data->flags.crt = 1;
1034 break;
1035 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1036 data->flags.lcd = 1;
1037 break;
1038 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1039 data->flags.tvout = 1;
1040 break;
1041 default:
1042 data->flags.unknown = 1;
1043 }
1044 }
1045
1046 acpi_video_device_bind(video, data);
1047 acpi_video_device_find_cap(data);
1048
1049 status = acpi_install_notify_handler(device->handle,
1050 ACPI_DEVICE_NOTIFY,
1051 acpi_video_device_notify,
1052 data);
1053 if (ACPI_FAILURE(status)) {
1054 printk(KERN_ERR PREFIX
1055 "Error installing notify handler\n");
1056 if(data->brightness)
1057 kfree(data->brightness->levels);
1058 kfree(data->brightness);
1059 kfree(data);
1060 return -ENODEV;
1061 }
1062
1063 mutex_lock(&video->device_list_lock);
1064 list_add_tail(&data->entry, &video->video_device_list);
1065 mutex_unlock(&video->device_list_lock);
1066
1067 return 0;
1068 }
1069
1070 return -ENOENT;
1071 }
1072
1073 /*
1074 * Arg:
1075 * video : video bus device
1076 *
1077 * Return:
1078 * none
1079 *
1080 * Enumerate the video device list of the video bus,
1081 * bind the ids with the corresponding video devices
1082 * under the video bus.
1083 */
1084
1085 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1086 {
1087 struct acpi_video_device *dev;
1088
1089 mutex_lock(&video->device_list_lock);
1090
1091 list_for_each_entry(dev, &video->video_device_list, entry)
1092 acpi_video_device_bind(video, dev);
1093
1094 mutex_unlock(&video->device_list_lock);
1095 }
1096
1097 /*
1098 * Arg:
1099 * video : video bus device
1100 * device : video output device under the video
1101 * bus
1102 *
1103 * Return:
1104 * none
1105 *
1106 * Bind the ids with the corresponding video devices
1107 * under the video bus.
1108 */
1109
1110 static void
1111 acpi_video_device_bind(struct acpi_video_bus *video,
1112 struct acpi_video_device *device)
1113 {
1114 struct acpi_video_enumerated_device *ids;
1115 int i;
1116
1117 for (i = 0; i < video->attached_count; i++) {
1118 ids = &video->attached_array[i];
1119 if (device->device_id == (ids->value.int_val & 0xffff)) {
1120 ids->bind_info = device;
1121 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1122 }
1123 }
1124 }
1125
1126 /*
1127 * Arg:
1128 * video : video bus device
1129 *
1130 * Return:
1131 * < 0 : error
1132 *
1133 * Call _DOD to enumerate all devices attached to display adapter
1134 *
1135 */
1136
1137 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1138 {
1139 int status;
1140 int count;
1141 int i;
1142 struct acpi_video_enumerated_device *active_list;
1143 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1144 union acpi_object *dod = NULL;
1145 union acpi_object *obj;
1146
1147 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1148 if (!ACPI_SUCCESS(status)) {
1149 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1150 return status;
1151 }
1152
1153 dod = buffer.pointer;
1154 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1155 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1156 status = -EFAULT;
1157 goto out;
1158 }
1159
1160 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1161 dod->package.count));
1162
1163 active_list = kcalloc(1 + dod->package.count,
1164 sizeof(struct acpi_video_enumerated_device),
1165 GFP_KERNEL);
1166 if (!active_list) {
1167 status = -ENOMEM;
1168 goto out;
1169 }
1170
1171 count = 0;
1172 for (i = 0; i < dod->package.count; i++) {
1173 obj = &dod->package.elements[i];
1174
1175 if (obj->type != ACPI_TYPE_INTEGER) {
1176 printk(KERN_ERR PREFIX
1177 "Invalid _DOD data in element %d\n", i);
1178 continue;
1179 }
1180
1181 active_list[count].value.int_val = obj->integer.value;
1182 active_list[count].bind_info = NULL;
1183 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1184 (int)obj->integer.value));
1185 count++;
1186 }
1187
1188 kfree(video->attached_array);
1189
1190 video->attached_array = active_list;
1191 video->attached_count = count;
1192
1193 out:
1194 kfree(buffer.pointer);
1195 return status;
1196 }
1197
1198 static int
1199 acpi_video_get_next_level(struct acpi_video_device *device,
1200 u32 level_current, u32 event)
1201 {
1202 int min, max, min_above, max_below, i, l, delta = 255;
1203 max = max_below = 0;
1204 min = min_above = 255;
1205 /* Find closest level to level_current */
1206 for (i = 2; i < device->brightness->count; i++) {
1207 l = device->brightness->levels[i];
1208 if (abs(l - level_current) < abs(delta)) {
1209 delta = l - level_current;
1210 if (!delta)
1211 break;
1212 }
1213 }
1214 /* Ajust level_current to closest available level */
1215 level_current += delta;
1216 for (i = 2; i < device->brightness->count; i++) {
1217 l = device->brightness->levels[i];
1218 if (l < min)
1219 min = l;
1220 if (l > max)
1221 max = l;
1222 if (l < min_above && l > level_current)
1223 min_above = l;
1224 if (l > max_below && l < level_current)
1225 max_below = l;
1226 }
1227
1228 switch (event) {
1229 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1230 return (level_current < max) ? min_above : min;
1231 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1232 return (level_current < max) ? min_above : max;
1233 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1234 return (level_current > min) ? max_below : min;
1235 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1236 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1237 return 0;
1238 default:
1239 return level_current;
1240 }
1241 }
1242
1243 static int
1244 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1245 {
1246 unsigned long long level_current, level_next;
1247 int result = -EINVAL;
1248
1249 /* no warning message if acpi_backlight=vendor is used */
1250 if (!acpi_video_backlight_support())
1251 return 0;
1252
1253 if (!device->brightness)
1254 goto out;
1255
1256 result = acpi_video_device_lcd_get_level_current(device,
1257 &level_current, 0);
1258 if (result)
1259 goto out;
1260
1261 level_next = acpi_video_get_next_level(device, level_current, event);
1262
1263 result = acpi_video_device_lcd_set_level(device, level_next);
1264
1265 if (!result)
1266 backlight_force_update(device->backlight,
1267 BACKLIGHT_UPDATE_HOTKEY);
1268
1269 out:
1270 if (result)
1271 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1272
1273 return result;
1274 }
1275
1276 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1277 void **edid)
1278 {
1279 struct acpi_video_bus *video;
1280 struct acpi_video_device *video_device;
1281 union acpi_object *buffer = NULL;
1282 acpi_status status;
1283 int i, length;
1284
1285 if (!device || !acpi_driver_data(device))
1286 return -EINVAL;
1287
1288 video = acpi_driver_data(device);
1289
1290 for (i = 0; i < video->attached_count; i++) {
1291 video_device = video->attached_array[i].bind_info;
1292 length = 256;
1293
1294 if (!video_device)
1295 continue;
1296
1297 if (!video_device->cap._DDC)
1298 continue;
1299
1300 if (type) {
1301 switch (type) {
1302 case ACPI_VIDEO_DISPLAY_CRT:
1303 if (!video_device->flags.crt)
1304 continue;
1305 break;
1306 case ACPI_VIDEO_DISPLAY_TV:
1307 if (!video_device->flags.tvout)
1308 continue;
1309 break;
1310 case ACPI_VIDEO_DISPLAY_DVI:
1311 if (!video_device->flags.dvi)
1312 continue;
1313 break;
1314 case ACPI_VIDEO_DISPLAY_LCD:
1315 if (!video_device->flags.lcd)
1316 continue;
1317 break;
1318 }
1319 } else if (video_device->device_id != device_id) {
1320 continue;
1321 }
1322
1323 status = acpi_video_device_EDID(video_device, &buffer, length);
1324
1325 if (ACPI_FAILURE(status) || !buffer ||
1326 buffer->type != ACPI_TYPE_BUFFER) {
1327 length = 128;
1328 status = acpi_video_device_EDID(video_device, &buffer,
1329 length);
1330 if (ACPI_FAILURE(status) || !buffer ||
1331 buffer->type != ACPI_TYPE_BUFFER) {
1332 continue;
1333 }
1334 }
1335
1336 *edid = buffer->buffer.pointer;
1337 return length;
1338 }
1339
1340 return -ENODEV;
1341 }
1342 EXPORT_SYMBOL(acpi_video_get_edid);
1343
1344 static int
1345 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1346 struct acpi_device *device)
1347 {
1348 int status;
1349 struct acpi_device *dev;
1350
1351 status = acpi_video_device_enumerate(video);
1352 if (status)
1353 return status;
1354
1355 list_for_each_entry(dev, &device->children, node) {
1356
1357 status = acpi_video_bus_get_one_device(dev, video);
1358 if (status) {
1359 printk(KERN_WARNING PREFIX
1360 "Can't attach device\n");
1361 continue;
1362 }
1363 }
1364 return status;
1365 }
1366
1367 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1368 {
1369 acpi_status status;
1370
1371 if (!device || !device->video)
1372 return -ENOENT;
1373
1374 status = acpi_remove_notify_handler(device->dev->handle,
1375 ACPI_DEVICE_NOTIFY,
1376 acpi_video_device_notify);
1377 if (ACPI_FAILURE(status)) {
1378 printk(KERN_WARNING PREFIX
1379 "Can't remove video notify handler\n");
1380 }
1381 if (device->backlight) {
1382 backlight_device_unregister(device->backlight);
1383 device->backlight = NULL;
1384 }
1385 if (device->cooling_dev) {
1386 sysfs_remove_link(&device->dev->dev.kobj,
1387 "thermal_cooling");
1388 sysfs_remove_link(&device->cooling_dev->device.kobj,
1389 "device");
1390 thermal_cooling_device_unregister(device->cooling_dev);
1391 device->cooling_dev = NULL;
1392 }
1393
1394 return 0;
1395 }
1396
1397 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1398 {
1399 int status;
1400 struct acpi_video_device *dev, *next;
1401
1402 mutex_lock(&video->device_list_lock);
1403
1404 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1405
1406 status = acpi_video_bus_put_one_device(dev);
1407 if (ACPI_FAILURE(status))
1408 printk(KERN_WARNING PREFIX
1409 "hhuuhhuu bug in acpi video driver.\n");
1410
1411 if (dev->brightness) {
1412 kfree(dev->brightness->levels);
1413 kfree(dev->brightness);
1414 }
1415 list_del(&dev->entry);
1416 kfree(dev);
1417 }
1418
1419 mutex_unlock(&video->device_list_lock);
1420
1421 return 0;
1422 }
1423
1424 /* acpi_video interface */
1425
1426 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1427 {
1428 return acpi_video_bus_DOS(video, 0, 0);
1429 }
1430
1431 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1432 {
1433 return acpi_video_bus_DOS(video, 0, 1);
1434 }
1435
1436 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1437 {
1438 struct acpi_video_bus *video = acpi_driver_data(device);
1439 struct input_dev *input;
1440 int keycode = 0;
1441
1442 if (!video)
1443 return;
1444
1445 input = video->input;
1446
1447 switch (event) {
1448 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1449 * most likely via hotkey. */
1450 acpi_bus_generate_proc_event(device, event, 0);
1451 if (!acpi_notifier_call_chain(device, event, 0))
1452 keycode = KEY_SWITCHVIDEOMODE;
1453 break;
1454
1455 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1456 * connector. */
1457 acpi_video_device_enumerate(video);
1458 acpi_video_device_rebind(video);
1459 acpi_bus_generate_proc_event(device, event, 0);
1460 keycode = KEY_SWITCHVIDEOMODE;
1461 break;
1462
1463 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1464 acpi_bus_generate_proc_event(device, event, 0);
1465 keycode = KEY_SWITCHVIDEOMODE;
1466 break;
1467 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1468 acpi_bus_generate_proc_event(device, event, 0);
1469 keycode = KEY_VIDEO_NEXT;
1470 break;
1471 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1472 acpi_bus_generate_proc_event(device, event, 0);
1473 keycode = KEY_VIDEO_PREV;
1474 break;
1475
1476 default:
1477 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1478 "Unsupported event [0x%x]\n", event));
1479 break;
1480 }
1481
1482 if (event != ACPI_VIDEO_NOTIFY_SWITCH)
1483 acpi_notifier_call_chain(device, event, 0);
1484
1485 if (keycode) {
1486 input_report_key(input, keycode, 1);
1487 input_sync(input);
1488 input_report_key(input, keycode, 0);
1489 input_sync(input);
1490 }
1491
1492 return;
1493 }
1494
1495 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1496 {
1497 struct acpi_video_device *video_device = data;
1498 struct acpi_device *device = NULL;
1499 struct acpi_video_bus *bus;
1500 struct input_dev *input;
1501 int keycode = 0;
1502
1503 if (!video_device)
1504 return;
1505
1506 device = video_device->dev;
1507 bus = video_device->video;
1508 input = bus->input;
1509
1510 switch (event) {
1511 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1512 if (brightness_switch_enabled)
1513 acpi_video_switch_brightness(video_device, event);
1514 acpi_bus_generate_proc_event(device, event, 0);
1515 keycode = KEY_BRIGHTNESS_CYCLE;
1516 break;
1517 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1518 if (brightness_switch_enabled)
1519 acpi_video_switch_brightness(video_device, event);
1520 acpi_bus_generate_proc_event(device, event, 0);
1521 keycode = KEY_BRIGHTNESSUP;
1522 break;
1523 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1524 if (brightness_switch_enabled)
1525 acpi_video_switch_brightness(video_device, event);
1526 acpi_bus_generate_proc_event(device, event, 0);
1527 keycode = KEY_BRIGHTNESSDOWN;
1528 break;
1529 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1530 if (brightness_switch_enabled)
1531 acpi_video_switch_brightness(video_device, event);
1532 acpi_bus_generate_proc_event(device, event, 0);
1533 keycode = KEY_BRIGHTNESS_ZERO;
1534 break;
1535 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1536 if (brightness_switch_enabled)
1537 acpi_video_switch_brightness(video_device, event);
1538 acpi_bus_generate_proc_event(device, event, 0);
1539 keycode = KEY_DISPLAY_OFF;
1540 break;
1541 default:
1542 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1543 "Unsupported event [0x%x]\n", event));
1544 break;
1545 }
1546
1547 acpi_notifier_call_chain(device, event, 0);
1548
1549 if (keycode) {
1550 input_report_key(input, keycode, 1);
1551 input_sync(input);
1552 input_report_key(input, keycode, 0);
1553 input_sync(input);
1554 }
1555
1556 return;
1557 }
1558
1559 static int acpi_video_resume(struct notifier_block *nb,
1560 unsigned long val, void *ign)
1561 {
1562 struct acpi_video_bus *video;
1563 struct acpi_video_device *video_device;
1564 int i;
1565
1566 switch (val) {
1567 case PM_HIBERNATION_PREPARE:
1568 case PM_SUSPEND_PREPARE:
1569 case PM_RESTORE_PREPARE:
1570 return NOTIFY_DONE;
1571 }
1572
1573 video = container_of(nb, struct acpi_video_bus, pm_nb);
1574
1575 dev_info(&video->device->dev, "Restoring backlight state\n");
1576
1577 for (i = 0; i < video->attached_count; i++) {
1578 video_device = video->attached_array[i].bind_info;
1579 if (video_device && video_device->backlight)
1580 acpi_video_set_brightness(video_device->backlight);
1581 }
1582
1583 return NOTIFY_OK;
1584 }
1585
1586 static acpi_status
1587 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1588 void **return_value)
1589 {
1590 struct acpi_device *device = context;
1591 struct acpi_device *sibling;
1592 int result;
1593
1594 if (handle == device->handle)
1595 return AE_CTRL_TERMINATE;
1596
1597 result = acpi_bus_get_device(handle, &sibling);
1598 if (result)
1599 return AE_OK;
1600
1601 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1602 return AE_ALREADY_EXISTS;
1603
1604 return AE_OK;
1605 }
1606
1607 static int instance;
1608
1609 static int acpi_video_bus_add(struct acpi_device *device)
1610 {
1611 struct acpi_video_bus *video;
1612 struct input_dev *input;
1613 int error;
1614 acpi_status status;
1615
1616 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1617 device->parent->handle, 1,
1618 acpi_video_bus_match, NULL,
1619 device, NULL);
1620 if (status == AE_ALREADY_EXISTS) {
1621 printk(KERN_WARNING FW_BUG
1622 "Duplicate ACPI video bus devices for the"
1623 " same VGA controller, please try module "
1624 "parameter \"video.allow_duplicates=1\""
1625 "if the current driver doesn't work.\n");
1626 if (!allow_duplicates)
1627 return -ENODEV;
1628 }
1629
1630 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1631 if (!video)
1632 return -ENOMEM;
1633
1634 /* a hack to fix the duplicate name "VID" problem on T61 */
1635 if (!strcmp(device->pnp.bus_id, "VID")) {
1636 if (instance)
1637 device->pnp.bus_id[3] = '0' + instance;
1638 instance ++;
1639 }
1640 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1641 if (!strcmp(device->pnp.bus_id, "VGA")) {
1642 if (instance)
1643 device->pnp.bus_id[3] = '0' + instance;
1644 instance++;
1645 }
1646
1647 video->device = device;
1648 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1649 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1650 device->driver_data = video;
1651
1652 acpi_video_bus_find_cap(video);
1653 error = acpi_video_bus_check(video);
1654 if (error)
1655 goto err_free_video;
1656
1657 mutex_init(&video->device_list_lock);
1658 INIT_LIST_HEAD(&video->video_device_list);
1659
1660 error = acpi_video_bus_get_devices(video, device);
1661 if (error)
1662 goto err_free_video;
1663
1664 video->input = input = input_allocate_device();
1665 if (!input) {
1666 error = -ENOMEM;
1667 goto err_put_video;
1668 }
1669
1670 error = acpi_video_bus_start_devices(video);
1671 if (error)
1672 goto err_free_input_dev;
1673
1674 snprintf(video->phys, sizeof(video->phys),
1675 "%s/video/input0", acpi_device_hid(video->device));
1676
1677 input->name = acpi_device_name(video->device);
1678 input->phys = video->phys;
1679 input->id.bustype = BUS_HOST;
1680 input->id.product = 0x06;
1681 input->dev.parent = &device->dev;
1682 input->evbit[0] = BIT(EV_KEY);
1683 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1684 set_bit(KEY_VIDEO_NEXT, input->keybit);
1685 set_bit(KEY_VIDEO_PREV, input->keybit);
1686 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1687 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1688 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1689 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1690 set_bit(KEY_DISPLAY_OFF, input->keybit);
1691
1692 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
1693 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1694 video->flags.multihead ? "yes" : "no",
1695 video->flags.rom ? "yes" : "no",
1696 video->flags.post ? "yes" : "no");
1697
1698 video->pm_nb.notifier_call = acpi_video_resume;
1699 video->pm_nb.priority = 0;
1700 error = register_pm_notifier(&video->pm_nb);
1701 if (error)
1702 goto err_stop_video;
1703
1704 error = input_register_device(input);
1705 if (error)
1706 goto err_unregister_pm_notifier;
1707
1708 return 0;
1709
1710 err_unregister_pm_notifier:
1711 unregister_pm_notifier(&video->pm_nb);
1712 err_stop_video:
1713 acpi_video_bus_stop_devices(video);
1714 err_free_input_dev:
1715 input_free_device(input);
1716 err_put_video:
1717 acpi_video_bus_put_devices(video);
1718 kfree(video->attached_array);
1719 err_free_video:
1720 kfree(video);
1721 device->driver_data = NULL;
1722
1723 return error;
1724 }
1725
1726 static int acpi_video_bus_remove(struct acpi_device *device, int type)
1727 {
1728 struct acpi_video_bus *video = NULL;
1729
1730
1731 if (!device || !acpi_driver_data(device))
1732 return -EINVAL;
1733
1734 video = acpi_driver_data(device);
1735
1736 unregister_pm_notifier(&video->pm_nb);
1737
1738 acpi_video_bus_stop_devices(video);
1739 acpi_video_bus_put_devices(video);
1740
1741 input_unregister_device(video->input);
1742 kfree(video->attached_array);
1743 kfree(video);
1744
1745 return 0;
1746 }
1747
1748 static int __init is_i740(struct pci_dev *dev)
1749 {
1750 if (dev->device == 0x00D1)
1751 return 1;
1752 if (dev->device == 0x7000)
1753 return 1;
1754 return 0;
1755 }
1756
1757 static int __init intel_opregion_present(void)
1758 {
1759 int opregion = 0;
1760 struct pci_dev *dev = NULL;
1761 u32 address;
1762
1763 for_each_pci_dev(dev) {
1764 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1765 continue;
1766 if (dev->vendor != PCI_VENDOR_ID_INTEL)
1767 continue;
1768 /* We don't want to poke around undefined i740 registers */
1769 if (is_i740(dev))
1770 continue;
1771 pci_read_config_dword(dev, 0xfc, &address);
1772 if (!address)
1773 continue;
1774 opregion = 1;
1775 }
1776 return opregion;
1777 }
1778
1779 int acpi_video_register(void)
1780 {
1781 int result = 0;
1782 if (register_count) {
1783 /*
1784 * if the function of acpi_video_register is already called,
1785 * don't register the acpi_vide_bus again and return no error.
1786 */
1787 return 0;
1788 }
1789
1790 result = acpi_bus_register_driver(&acpi_video_bus);
1791 if (result < 0)
1792 return -ENODEV;
1793
1794 /*
1795 * When the acpi_video_bus is loaded successfully, increase
1796 * the counter reference.
1797 */
1798 register_count = 1;
1799
1800 return 0;
1801 }
1802 EXPORT_SYMBOL(acpi_video_register);
1803
1804 void acpi_video_unregister(void)
1805 {
1806 if (!register_count) {
1807 /*
1808 * If the acpi video bus is already unloaded, don't
1809 * unload it again and return directly.
1810 */
1811 return;
1812 }
1813 acpi_bus_unregister_driver(&acpi_video_bus);
1814
1815 register_count = 0;
1816
1817 return;
1818 }
1819 EXPORT_SYMBOL(acpi_video_unregister);
1820
1821 /*
1822 * This is kind of nasty. Hardware using Intel chipsets may require
1823 * the video opregion code to be run first in order to initialise
1824 * state before any ACPI video calls are made. To handle this we defer
1825 * registration of the video class until the opregion code has run.
1826 */
1827
1828 static int __init acpi_video_init(void)
1829 {
1830 dmi_check_system(video_dmi_table);
1831
1832 if (intel_opregion_present())
1833 return 0;
1834
1835 return acpi_video_register();
1836 }
1837
1838 static void __exit acpi_video_exit(void)
1839 {
1840 acpi_video_unregister();
1841
1842 return;
1843 }
1844
1845 module_init(acpi_video_init);
1846 module_exit(acpi_video_exit);
Linux ARM platform port for MOXA ART SoC