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Merge branch 'misc-2.6.32' into release
[mirror_ubuntu-artful-kernel.git] / drivers / acpi / video.c
1 /*
2 * video.c - ACPI Video Driver ($Revision:$)
3 *
4 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
5 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
6 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
7 *
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23 *
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 */
26
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/types.h>
31 #include <linux/list.h>
32 #include <linux/mutex.h>
33 #include <linux/proc_fs.h>
34 #include <linux/seq_file.h>
35 #include <linux/input.h>
36 #include <linux/backlight.h>
37 #include <linux/thermal.h>
38 #include <linux/video_output.h>
39 #include <linux/sort.h>
40 #include <linux/pci.h>
41 #include <linux/pci_ids.h>
42 #include <asm/uaccess.h>
43 #include <linux/dmi.h>
44 #include <acpi/acpi_bus.h>
45 #include <acpi/acpi_drivers.h>
46
47 #define PREFIX "ACPI: "
48
49 #define ACPI_VIDEO_CLASS "video"
50 #define ACPI_VIDEO_BUS_NAME "Video Bus"
51 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
52 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
53 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
54 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
55 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
56 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
57
58 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
59 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
60 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
61 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
62 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
63
64 #define MAX_NAME_LEN 20
65
66 #define ACPI_VIDEO_DISPLAY_CRT 1
67 #define ACPI_VIDEO_DISPLAY_TV 2
68 #define ACPI_VIDEO_DISPLAY_DVI 3
69 #define ACPI_VIDEO_DISPLAY_LCD 4
70
71 #define _COMPONENT ACPI_VIDEO_COMPONENT
72 ACPI_MODULE_NAME("video");
73
74 MODULE_AUTHOR("Bruno Ducrot");
75 MODULE_DESCRIPTION("ACPI Video Driver");
76 MODULE_LICENSE("GPL");
77
78 static int brightness_switch_enabled = 1;
79 module_param(brightness_switch_enabled, bool, 0644);
80
81 static int register_count = 0;
82 static int acpi_video_bus_add(struct acpi_device *device);
83 static int acpi_video_bus_remove(struct acpi_device *device, int type);
84 static int acpi_video_resume(struct acpi_device *device);
85 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
86
87 static const struct acpi_device_id video_device_ids[] = {
88 {ACPI_VIDEO_HID, 0},
89 {"", 0},
90 };
91 MODULE_DEVICE_TABLE(acpi, video_device_ids);
92
93 static struct acpi_driver acpi_video_bus = {
94 .name = "video",
95 .class = ACPI_VIDEO_CLASS,
96 .ids = video_device_ids,
97 .ops = {
98 .add = acpi_video_bus_add,
99 .remove = acpi_video_bus_remove,
100 .resume = acpi_video_resume,
101 .notify = acpi_video_bus_notify,
102 },
103 };
104
105 struct acpi_video_bus_flags {
106 u8 multihead:1; /* can switch video heads */
107 u8 rom:1; /* can retrieve a video rom */
108 u8 post:1; /* can configure the head to */
109 u8 reserved:5;
110 };
111
112 struct acpi_video_bus_cap {
113 u8 _DOS:1; /*Enable/Disable output switching */
114 u8 _DOD:1; /*Enumerate all devices attached to display adapter */
115 u8 _ROM:1; /*Get ROM Data */
116 u8 _GPD:1; /*Get POST Device */
117 u8 _SPD:1; /*Set POST Device */
118 u8 _VPO:1; /*Video POST Options */
119 u8 reserved:2;
120 };
121
122 struct acpi_video_device_attrib {
123 u32 display_index:4; /* A zero-based instance of the Display */
124 u32 display_port_attachment:4; /*This field differentiates the display type */
125 u32 display_type:4; /*Describe the specific type in use */
126 u32 vendor_specific:4; /*Chipset Vendor Specific */
127 u32 bios_can_detect:1; /*BIOS can detect the device */
128 u32 depend_on_vga:1; /*Non-VGA output device whose power is related to
129 the VGA device. */
130 u32 pipe_id:3; /*For VGA multiple-head devices. */
131 u32 reserved:10; /*Must be 0 */
132 u32 device_id_scheme:1; /*Device ID Scheme */
133 };
134
135 struct acpi_video_enumerated_device {
136 union {
137 u32 int_val;
138 struct acpi_video_device_attrib attrib;
139 } value;
140 struct acpi_video_device *bind_info;
141 };
142
143 struct acpi_video_bus {
144 struct acpi_device *device;
145 u8 dos_setting;
146 struct acpi_video_enumerated_device *attached_array;
147 u8 attached_count;
148 struct acpi_video_bus_cap cap;
149 struct acpi_video_bus_flags flags;
150 struct list_head video_device_list;
151 struct mutex device_list_lock; /* protects video_device_list */
152 struct proc_dir_entry *dir;
153 struct input_dev *input;
154 char phys[32]; /* for input device */
155 };
156
157 struct acpi_video_device_flags {
158 u8 crt:1;
159 u8 lcd:1;
160 u8 tvout:1;
161 u8 dvi:1;
162 u8 bios:1;
163 u8 unknown:1;
164 u8 reserved:2;
165 };
166
167 struct acpi_video_device_cap {
168 u8 _ADR:1; /*Return the unique ID */
169 u8 _BCL:1; /*Query list of brightness control levels supported */
170 u8 _BCM:1; /*Set the brightness level */
171 u8 _BQC:1; /* Get current brightness level */
172 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
173 u8 _DDC:1; /*Return the EDID for this device */
174 u8 _DCS:1; /*Return status of output device */
175 u8 _DGS:1; /*Query graphics state */
176 u8 _DSS:1; /*Device state set */
177 };
178
179 struct acpi_video_brightness_flags {
180 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
181 u8 _BCL_reversed:1; /* _BCL package is in a reversed order*/
182 u8 _BCL_use_index:1; /* levels in _BCL are index values */
183 u8 _BCM_use_index:1; /* input of _BCM is an index value */
184 u8 _BQC_use_index:1; /* _BQC returns an index value */
185 };
186
187 struct acpi_video_device_brightness {
188 int curr;
189 int count;
190 int *levels;
191 struct acpi_video_brightness_flags flags;
192 };
193
194 struct acpi_video_device {
195 unsigned long device_id;
196 struct acpi_video_device_flags flags;
197 struct acpi_video_device_cap cap;
198 struct list_head entry;
199 struct acpi_video_bus *video;
200 struct acpi_device *dev;
201 struct acpi_video_device_brightness *brightness;
202 struct backlight_device *backlight;
203 struct thermal_cooling_device *cdev;
204 struct output_device *output_dev;
205 };
206
207 /* bus */
208 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
209 static const struct file_operations acpi_video_bus_info_fops = {
210 .owner = THIS_MODULE,
211 .open = acpi_video_bus_info_open_fs,
212 .read = seq_read,
213 .llseek = seq_lseek,
214 .release = single_release,
215 };
216
217 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
218 static const struct file_operations acpi_video_bus_ROM_fops = {
219 .owner = THIS_MODULE,
220 .open = acpi_video_bus_ROM_open_fs,
221 .read = seq_read,
222 .llseek = seq_lseek,
223 .release = single_release,
224 };
225
226 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
227 struct file *file);
228 static const struct file_operations acpi_video_bus_POST_info_fops = {
229 .owner = THIS_MODULE,
230 .open = acpi_video_bus_POST_info_open_fs,
231 .read = seq_read,
232 .llseek = seq_lseek,
233 .release = single_release,
234 };
235
236 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
237 static ssize_t acpi_video_bus_write_POST(struct file *file,
238 const char __user *buffer, size_t count, loff_t *data);
239 static const struct file_operations acpi_video_bus_POST_fops = {
240 .owner = THIS_MODULE,
241 .open = acpi_video_bus_POST_open_fs,
242 .read = seq_read,
243 .write = acpi_video_bus_write_POST,
244 .llseek = seq_lseek,
245 .release = single_release,
246 };
247
248 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
249 static ssize_t acpi_video_bus_write_DOS(struct file *file,
250 const char __user *buffer, size_t count, loff_t *data);
251 static const struct file_operations acpi_video_bus_DOS_fops = {
252 .owner = THIS_MODULE,
253 .open = acpi_video_bus_DOS_open_fs,
254 .read = seq_read,
255 .write = acpi_video_bus_write_DOS,
256 .llseek = seq_lseek,
257 .release = single_release,
258 };
259
260 /* device */
261 static int acpi_video_device_info_open_fs(struct inode *inode,
262 struct file *file);
263 static const struct file_operations acpi_video_device_info_fops = {
264 .owner = THIS_MODULE,
265 .open = acpi_video_device_info_open_fs,
266 .read = seq_read,
267 .llseek = seq_lseek,
268 .release = single_release,
269 };
270
271 static int acpi_video_device_state_open_fs(struct inode *inode,
272 struct file *file);
273 static ssize_t acpi_video_device_write_state(struct file *file,
274 const char __user *buffer, size_t count, loff_t *data);
275 static const struct file_operations acpi_video_device_state_fops = {
276 .owner = THIS_MODULE,
277 .open = acpi_video_device_state_open_fs,
278 .read = seq_read,
279 .write = acpi_video_device_write_state,
280 .llseek = seq_lseek,
281 .release = single_release,
282 };
283
284 static int acpi_video_device_brightness_open_fs(struct inode *inode,
285 struct file *file);
286 static ssize_t acpi_video_device_write_brightness(struct file *file,
287 const char __user *buffer, size_t count, loff_t *data);
288 static struct file_operations acpi_video_device_brightness_fops = {
289 .owner = THIS_MODULE,
290 .open = acpi_video_device_brightness_open_fs,
291 .read = seq_read,
292 .write = acpi_video_device_write_brightness,
293 .llseek = seq_lseek,
294 .release = single_release,
295 };
296
297 static int acpi_video_device_EDID_open_fs(struct inode *inode,
298 struct file *file);
299 static const struct file_operations acpi_video_device_EDID_fops = {
300 .owner = THIS_MODULE,
301 .open = acpi_video_device_EDID_open_fs,
302 .read = seq_read,
303 .llseek = seq_lseek,
304 .release = single_release,
305 };
306
307 static const char device_decode[][30] = {
308 "motherboard VGA device",
309 "PCI VGA device",
310 "AGP VGA device",
311 "UNKNOWN",
312 };
313
314 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
315 static void acpi_video_device_rebind(struct acpi_video_bus *video);
316 static void acpi_video_device_bind(struct acpi_video_bus *video,
317 struct acpi_video_device *device);
318 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
319 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
320 int level);
321 static int acpi_video_device_lcd_get_level_current(
322 struct acpi_video_device *device,
323 unsigned long long *level);
324 static int acpi_video_get_next_level(struct acpi_video_device *device,
325 u32 level_current, u32 event);
326 static int acpi_video_switch_brightness(struct acpi_video_device *device,
327 int event);
328 static int acpi_video_device_get_state(struct acpi_video_device *device,
329 unsigned long long *state);
330 static int acpi_video_output_get(struct output_device *od);
331 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
332
333 /*backlight device sysfs support*/
334 static int acpi_video_get_brightness(struct backlight_device *bd)
335 {
336 unsigned long long cur_level;
337 int i;
338 struct acpi_video_device *vd =
339 (struct acpi_video_device *)bl_get_data(bd);
340
341 if (acpi_video_device_lcd_get_level_current(vd, &cur_level))
342 return -EINVAL;
343 for (i = 2; i < vd->brightness->count; i++) {
344 if (vd->brightness->levels[i] == cur_level)
345 /* The first two entries are special - see page 575
346 of the ACPI spec 3.0 */
347 return i-2;
348 }
349 return 0;
350 }
351
352 static int acpi_video_set_brightness(struct backlight_device *bd)
353 {
354 int request_level = bd->props.brightness + 2;
355 struct acpi_video_device *vd =
356 (struct acpi_video_device *)bl_get_data(bd);
357
358 return acpi_video_device_lcd_set_level(vd,
359 vd->brightness->levels[request_level]);
360 }
361
362 static struct backlight_ops acpi_backlight_ops = {
363 .get_brightness = acpi_video_get_brightness,
364 .update_status = acpi_video_set_brightness,
365 };
366
367 /*video output device sysfs support*/
368 static int acpi_video_output_get(struct output_device *od)
369 {
370 unsigned long long state;
371 struct acpi_video_device *vd =
372 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
373 acpi_video_device_get_state(vd, &state);
374 return (int)state;
375 }
376
377 static int acpi_video_output_set(struct output_device *od)
378 {
379 unsigned long state = od->request_state;
380 struct acpi_video_device *vd=
381 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
382 return acpi_video_device_set_state(vd, state);
383 }
384
385 static struct output_properties acpi_output_properties = {
386 .set_state = acpi_video_output_set,
387 .get_status = acpi_video_output_get,
388 };
389
390
391 /* thermal cooling device callbacks */
392 static int video_get_max_state(struct thermal_cooling_device *cdev, unsigned
393 long *state)
394 {
395 struct acpi_device *device = cdev->devdata;
396 struct acpi_video_device *video = acpi_driver_data(device);
397
398 *state = video->brightness->count - 3;
399 return 0;
400 }
401
402 static int video_get_cur_state(struct thermal_cooling_device *cdev, unsigned
403 long *state)
404 {
405 struct acpi_device *device = cdev->devdata;
406 struct acpi_video_device *video = acpi_driver_data(device);
407 unsigned long long level;
408 int offset;
409
410 if (acpi_video_device_lcd_get_level_current(video, &level))
411 return -EINVAL;
412 for (offset = 2; offset < video->brightness->count; offset++)
413 if (level == video->brightness->levels[offset]) {
414 *state = video->brightness->count - offset - 1;
415 return 0;
416 }
417
418 return -EINVAL;
419 }
420
421 static int
422 video_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
423 {
424 struct acpi_device *device = cdev->devdata;
425 struct acpi_video_device *video = acpi_driver_data(device);
426 int level;
427
428 if ( state >= video->brightness->count - 2)
429 return -EINVAL;
430
431 state = video->brightness->count - state;
432 level = video->brightness->levels[state -1];
433 return acpi_video_device_lcd_set_level(video, level);
434 }
435
436 static struct thermal_cooling_device_ops video_cooling_ops = {
437 .get_max_state = video_get_max_state,
438 .get_cur_state = video_get_cur_state,
439 .set_cur_state = video_set_cur_state,
440 };
441
442 /* --------------------------------------------------------------------------
443 Video Management
444 -------------------------------------------------------------------------- */
445
446 /* device */
447
448 static int
449 acpi_video_device_query(struct acpi_video_device *device, unsigned long long *state)
450 {
451 int status;
452
453 status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
454
455 return status;
456 }
457
458 static int
459 acpi_video_device_get_state(struct acpi_video_device *device,
460 unsigned long long *state)
461 {
462 int status;
463
464 status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
465
466 return status;
467 }
468
469 static int
470 acpi_video_device_set_state(struct acpi_video_device *device, int state)
471 {
472 int status;
473 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
474 struct acpi_object_list args = { 1, &arg0 };
475 unsigned long long ret;
476
477
478 arg0.integer.value = state;
479 status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
480
481 return status;
482 }
483
484 static int
485 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
486 union acpi_object **levels)
487 {
488 int status;
489 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
490 union acpi_object *obj;
491
492
493 *levels = NULL;
494
495 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
496 if (!ACPI_SUCCESS(status))
497 return status;
498 obj = (union acpi_object *)buffer.pointer;
499 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
500 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
501 status = -EFAULT;
502 goto err;
503 }
504
505 *levels = obj;
506
507 return 0;
508
509 err:
510 kfree(buffer.pointer);
511
512 return status;
513 }
514
515 static int
516 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
517 {
518 int status;
519 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
520 struct acpi_object_list args = { 1, &arg0 };
521 int state;
522
523 arg0.integer.value = level;
524
525 status = acpi_evaluate_object(device->dev->handle, "_BCM",
526 &args, NULL);
527 if (ACPI_FAILURE(status)) {
528 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
529 return -EIO;
530 }
531
532 device->brightness->curr = level;
533 for (state = 2; state < device->brightness->count; state++)
534 if (level == device->brightness->levels[state]) {
535 if (device->backlight)
536 device->backlight->props.brightness = state - 2;
537 return 0;
538 }
539
540 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
541 return -EINVAL;
542 }
543
544 /*
545 * For some buggy _BQC methods, we need to add a constant value to
546 * the _BQC return value to get the actual current brightness level
547 */
548
549 static int bqc_offset_aml_bug_workaround;
550 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
551 {
552 bqc_offset_aml_bug_workaround = 9;
553 return 0;
554 }
555
556 static struct dmi_system_id video_dmi_table[] __initdata = {
557 /*
558 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
559 */
560 {
561 .callback = video_set_bqc_offset,
562 .ident = "Acer Aspire 5720",
563 .matches = {
564 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
565 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
566 },
567 },
568 {
569 .callback = video_set_bqc_offset,
570 .ident = "Acer Aspire 5710Z",
571 .matches = {
572 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
573 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
574 },
575 },
576 {
577 .callback = video_set_bqc_offset,
578 .ident = "eMachines E510",
579 .matches = {
580 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
581 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
582 },
583 },
584 {
585 .callback = video_set_bqc_offset,
586 .ident = "Acer Aspire 5315",
587 .matches = {
588 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
589 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
590 },
591 },
592 {
593 .callback = video_set_bqc_offset,
594 .ident = "Acer Aspire 7720",
595 .matches = {
596 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
597 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
598 },
599 },
600 {}
601 };
602
603 static int
604 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
605 unsigned long long *level)
606 {
607 acpi_status status = AE_OK;
608
609 if (device->cap._BQC || device->cap._BCQ) {
610 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
611
612 status = acpi_evaluate_integer(device->dev->handle, buf,
613 NULL, level);
614 if (ACPI_SUCCESS(status)) {
615 if (device->brightness->flags._BQC_use_index) {
616 if (device->brightness->flags._BCL_reversed)
617 *level = device->brightness->count
618 - 3 - (*level);
619 *level = device->brightness->levels[*level + 2];
620
621 }
622 *level += bqc_offset_aml_bug_workaround;
623 device->brightness->curr = *level;
624 return 0;
625 } else {
626 /* Fixme:
627 * should we return an error or ignore this failure?
628 * dev->brightness->curr is a cached value which stores
629 * the correct current backlight level in most cases.
630 * ACPI video backlight still works w/ buggy _BQC.
631 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
632 */
633 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
634 device->cap._BQC = device->cap._BCQ = 0;
635 }
636 }
637
638 *level = device->brightness->curr;
639 return 0;
640 }
641
642 static int
643 acpi_video_device_EDID(struct acpi_video_device *device,
644 union acpi_object **edid, ssize_t length)
645 {
646 int status;
647 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
648 union acpi_object *obj;
649 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
650 struct acpi_object_list args = { 1, &arg0 };
651
652
653 *edid = NULL;
654
655 if (!device)
656 return -ENODEV;
657 if (length == 128)
658 arg0.integer.value = 1;
659 else if (length == 256)
660 arg0.integer.value = 2;
661 else
662 return -EINVAL;
663
664 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
665 if (ACPI_FAILURE(status))
666 return -ENODEV;
667
668 obj = buffer.pointer;
669
670 if (obj && obj->type == ACPI_TYPE_BUFFER)
671 *edid = obj;
672 else {
673 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
674 status = -EFAULT;
675 kfree(obj);
676 }
677
678 return status;
679 }
680
681 /* bus */
682
683 static int
684 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
685 {
686 int status;
687 unsigned long long tmp;
688 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
689 struct acpi_object_list args = { 1, &arg0 };
690
691
692 arg0.integer.value = option;
693
694 status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
695 if (ACPI_SUCCESS(status))
696 status = tmp ? (-EINVAL) : (AE_OK);
697
698 return status;
699 }
700
701 static int
702 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long long *id)
703 {
704 int status;
705
706 status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
707
708 return status;
709 }
710
711 static int
712 acpi_video_bus_POST_options(struct acpi_video_bus *video,
713 unsigned long long *options)
714 {
715 int status;
716
717 status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
718 *options &= 3;
719
720 return status;
721 }
722
723 /*
724 * Arg:
725 * video : video bus device pointer
726 * bios_flag :
727 * 0. The system BIOS should NOT automatically switch(toggle)
728 * the active display output.
729 * 1. The system BIOS should automatically switch (toggle) the
730 * active display output. No switch event.
731 * 2. The _DGS value should be locked.
732 * 3. The system BIOS should not automatically switch (toggle) the
733 * active display output, but instead generate the display switch
734 * event notify code.
735 * lcd_flag :
736 * 0. The system BIOS should automatically control the brightness level
737 * of the LCD when the power changes from AC to DC
738 * 1. The system BIOS should NOT automatically control the brightness
739 * level of the LCD when the power changes from AC to DC.
740 * Return Value:
741 * -1 wrong arg.
742 */
743
744 static int
745 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
746 {
747 acpi_integer status = 0;
748 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
749 struct acpi_object_list args = { 1, &arg0 };
750
751
752 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
753 status = -1;
754 goto Failed;
755 }
756 arg0.integer.value = (lcd_flag << 2) | bios_flag;
757 video->dos_setting = arg0.integer.value;
758 acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
759
760 Failed:
761 return status;
762 }
763
764 /*
765 * Simple comparison function used to sort backlight levels.
766 */
767
768 static int
769 acpi_video_cmp_level(const void *a, const void *b)
770 {
771 return *(int *)a - *(int *)b;
772 }
773
774 /*
775 * Arg:
776 * device : video output device (LCD, CRT, ..)
777 *
778 * Return Value:
779 * Maximum brightness level
780 *
781 * Allocate and initialize device->brightness.
782 */
783
784 static int
785 acpi_video_init_brightness(struct acpi_video_device *device)
786 {
787 union acpi_object *obj = NULL;
788 int i, max_level = 0, count = 0, level_ac_battery = 0;
789 unsigned long long level, level_old;
790 union acpi_object *o;
791 struct acpi_video_device_brightness *br = NULL;
792 int result = -EINVAL;
793
794 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
795 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
796 "LCD brightness level\n"));
797 goto out;
798 }
799
800 if (obj->package.count < 2)
801 goto out;
802
803 br = kzalloc(sizeof(*br), GFP_KERNEL);
804 if (!br) {
805 printk(KERN_ERR "can't allocate memory\n");
806 result = -ENOMEM;
807 goto out;
808 }
809
810 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
811 GFP_KERNEL);
812 if (!br->levels) {
813 result = -ENOMEM;
814 goto out_free;
815 }
816
817 for (i = 0; i < obj->package.count; i++) {
818 o = (union acpi_object *)&obj->package.elements[i];
819 if (o->type != ACPI_TYPE_INTEGER) {
820 printk(KERN_ERR PREFIX "Invalid data\n");
821 continue;
822 }
823 br->levels[count] = (u32) o->integer.value;
824
825 if (br->levels[count] > max_level)
826 max_level = br->levels[count];
827 count++;
828 }
829
830 /*
831 * some buggy BIOS don't export the levels
832 * when machine is on AC/Battery in _BCL package.
833 * In this case, the first two elements in _BCL packages
834 * are also supported brightness levels that OS should take care of.
835 */
836 for (i = 2; i < count; i++) {
837 if (br->levels[i] == br->levels[0])
838 level_ac_battery++;
839 if (br->levels[i] == br->levels[1])
840 level_ac_battery++;
841 }
842
843 if (level_ac_battery < 2) {
844 level_ac_battery = 2 - level_ac_battery;
845 br->flags._BCL_no_ac_battery_levels = 1;
846 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
847 br->levels[i] = br->levels[i - level_ac_battery];
848 count += level_ac_battery;
849 } else if (level_ac_battery > 2)
850 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
851
852 /* Check if the _BCL package is in a reversed order */
853 if (max_level == br->levels[2]) {
854 br->flags._BCL_reversed = 1;
855 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
856 acpi_video_cmp_level, NULL);
857 } else if (max_level != br->levels[count - 1])
858 ACPI_ERROR((AE_INFO,
859 "Found unordered _BCL package\n"));
860
861 br->count = count;
862 device->brightness = br;
863
864 /* Check the input/output of _BQC/_BCL/_BCM */
865 if ((max_level < 100) && (max_level <= (count - 2)))
866 br->flags._BCL_use_index = 1;
867
868 /*
869 * _BCM is always consistent with _BCL,
870 * at least for all the laptops we have ever seen.
871 */
872 br->flags._BCM_use_index = br->flags._BCL_use_index;
873
874 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
875 br->curr = level_old = max_level;
876
877 if (!device->cap._BQC)
878 goto set_level;
879
880 result = acpi_video_device_lcd_get_level_current(device, &level_old);
881 if (result)
882 goto out_free_levels;
883
884 /*
885 * Set the level to maximum and check if _BQC uses indexed value
886 */
887 result = acpi_video_device_lcd_set_level(device, max_level);
888 if (result)
889 goto out_free_levels;
890
891 result = acpi_video_device_lcd_get_level_current(device, &level);
892 if (result)
893 goto out_free_levels;
894
895 br->flags._BQC_use_index = (level == max_level ? 0 : 1);
896
897 if (!br->flags._BQC_use_index)
898 goto set_level;
899
900 if (br->flags._BCL_reversed)
901 level_old = (br->count - 1) - level_old;
902 level_old = br->levels[level_old];
903
904 set_level:
905 result = acpi_video_device_lcd_set_level(device, level_old);
906 if (result)
907 goto out_free_levels;
908
909 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
910 "found %d brightness levels\n", count - 2));
911 kfree(obj);
912 return result;
913
914 out_free_levels:
915 kfree(br->levels);
916 out_free:
917 kfree(br);
918 out:
919 device->brightness = NULL;
920 kfree(obj);
921 return result;
922 }
923
924 /*
925 * Arg:
926 * device : video output device (LCD, CRT, ..)
927 *
928 * Return Value:
929 * None
930 *
931 * Find out all required AML methods defined under the output
932 * device.
933 */
934
935 static void acpi_video_device_find_cap(struct acpi_video_device *device)
936 {
937 acpi_handle h_dummy1;
938
939
940 memset(&device->cap, 0, sizeof(device->cap));
941
942 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
943 device->cap._ADR = 1;
944 }
945 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
946 device->cap._BCL = 1;
947 }
948 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
949 device->cap._BCM = 1;
950 }
951 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
952 device->cap._BQC = 1;
953 else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
954 &h_dummy1))) {
955 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
956 device->cap._BCQ = 1;
957 }
958
959 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
960 device->cap._DDC = 1;
961 }
962 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
963 device->cap._DCS = 1;
964 }
965 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
966 device->cap._DGS = 1;
967 }
968 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
969 device->cap._DSS = 1;
970 }
971
972 if (acpi_video_backlight_support()) {
973 int result;
974 static int count = 0;
975 char *name;
976
977 result = acpi_video_init_brightness(device);
978 if (result)
979 return;
980 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
981 if (!name)
982 return;
983
984 sprintf(name, "acpi_video%d", count++);
985 device->backlight = backlight_device_register(name,
986 NULL, device, &acpi_backlight_ops);
987 device->backlight->props.max_brightness = device->brightness->count-3;
988 kfree(name);
989
990 result = sysfs_create_link(&device->backlight->dev.kobj,
991 &device->dev->dev.kobj, "device");
992 if (result)
993 printk(KERN_ERR PREFIX "Create sysfs link\n");
994
995 device->cdev = thermal_cooling_device_register("LCD",
996 device->dev, &video_cooling_ops);
997 if (IS_ERR(device->cdev))
998 return;
999
1000 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1001 device->cdev->id);
1002 result = sysfs_create_link(&device->dev->dev.kobj,
1003 &device->cdev->device.kobj,
1004 "thermal_cooling");
1005 if (result)
1006 printk(KERN_ERR PREFIX "Create sysfs link\n");
1007 result = sysfs_create_link(&device->cdev->device.kobj,
1008 &device->dev->dev.kobj, "device");
1009 if (result)
1010 printk(KERN_ERR PREFIX "Create sysfs link\n");
1011
1012 }
1013
1014 if (acpi_video_display_switch_support()) {
1015
1016 if (device->cap._DCS && device->cap._DSS) {
1017 static int count;
1018 char *name;
1019 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
1020 if (!name)
1021 return;
1022 sprintf(name, "acpi_video%d", count++);
1023 device->output_dev = video_output_register(name,
1024 NULL, device, &acpi_output_properties);
1025 kfree(name);
1026 }
1027 }
1028 }
1029
1030 /*
1031 * Arg:
1032 * device : video output device (VGA)
1033 *
1034 * Return Value:
1035 * None
1036 *
1037 * Find out all required AML methods defined under the video bus device.
1038 */
1039
1040 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1041 {
1042 acpi_handle h_dummy1;
1043
1044 memset(&video->cap, 0, sizeof(video->cap));
1045 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
1046 video->cap._DOS = 1;
1047 }
1048 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
1049 video->cap._DOD = 1;
1050 }
1051 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
1052 video->cap._ROM = 1;
1053 }
1054 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
1055 video->cap._GPD = 1;
1056 }
1057 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
1058 video->cap._SPD = 1;
1059 }
1060 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
1061 video->cap._VPO = 1;
1062 }
1063 }
1064
1065 /*
1066 * Check whether the video bus device has required AML method to
1067 * support the desired features
1068 */
1069
1070 static int acpi_video_bus_check(struct acpi_video_bus *video)
1071 {
1072 acpi_status status = -ENOENT;
1073 struct pci_dev *dev;
1074
1075 if (!video)
1076 return -EINVAL;
1077
1078 dev = acpi_get_pci_dev(video->device->handle);
1079 if (!dev)
1080 return -ENODEV;
1081 pci_dev_put(dev);
1082
1083 /* Since there is no HID, CID and so on for VGA driver, we have
1084 * to check well known required nodes.
1085 */
1086
1087 /* Does this device support video switching? */
1088 if (video->cap._DOS) {
1089 video->flags.multihead = 1;
1090 status = 0;
1091 }
1092
1093 /* Does this device support retrieving a video ROM? */
1094 if (video->cap._ROM) {
1095 video->flags.rom = 1;
1096 status = 0;
1097 }
1098
1099 /* Does this device support configuring which video device to POST? */
1100 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1101 video->flags.post = 1;
1102 status = 0;
1103 }
1104
1105 return status;
1106 }
1107
1108 /* --------------------------------------------------------------------------
1109 FS Interface (/proc)
1110 -------------------------------------------------------------------------- */
1111
1112 static struct proc_dir_entry *acpi_video_dir;
1113
1114 /* video devices */
1115
1116 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
1117 {
1118 struct acpi_video_device *dev = seq->private;
1119
1120
1121 if (!dev)
1122 goto end;
1123
1124 seq_printf(seq, "device_id: 0x%04x\n", (u32) dev->device_id);
1125 seq_printf(seq, "type: ");
1126 if (dev->flags.crt)
1127 seq_printf(seq, "CRT\n");
1128 else if (dev->flags.lcd)
1129 seq_printf(seq, "LCD\n");
1130 else if (dev->flags.tvout)
1131 seq_printf(seq, "TVOUT\n");
1132 else if (dev->flags.dvi)
1133 seq_printf(seq, "DVI\n");
1134 else
1135 seq_printf(seq, "UNKNOWN\n");
1136
1137 seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
1138
1139 end:
1140 return 0;
1141 }
1142
1143 static int
1144 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
1145 {
1146 return single_open(file, acpi_video_device_info_seq_show,
1147 PDE(inode)->data);
1148 }
1149
1150 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
1151 {
1152 int status;
1153 struct acpi_video_device *dev = seq->private;
1154 unsigned long long state;
1155
1156
1157 if (!dev)
1158 goto end;
1159
1160 status = acpi_video_device_get_state(dev, &state);
1161 seq_printf(seq, "state: ");
1162 if (ACPI_SUCCESS(status))
1163 seq_printf(seq, "0x%02llx\n", state);
1164 else
1165 seq_printf(seq, "<not supported>\n");
1166
1167 status = acpi_video_device_query(dev, &state);
1168 seq_printf(seq, "query: ");
1169 if (ACPI_SUCCESS(status))
1170 seq_printf(seq, "0x%02llx\n", state);
1171 else
1172 seq_printf(seq, "<not supported>\n");
1173
1174 end:
1175 return 0;
1176 }
1177
1178 static int
1179 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
1180 {
1181 return single_open(file, acpi_video_device_state_seq_show,
1182 PDE(inode)->data);
1183 }
1184
1185 static ssize_t
1186 acpi_video_device_write_state(struct file *file,
1187 const char __user * buffer,
1188 size_t count, loff_t * data)
1189 {
1190 int status;
1191 struct seq_file *m = file->private_data;
1192 struct acpi_video_device *dev = m->private;
1193 char str[12] = { 0 };
1194 u32 state = 0;
1195
1196
1197 if (!dev || count + 1 > sizeof str)
1198 return -EINVAL;
1199
1200 if (copy_from_user(str, buffer, count))
1201 return -EFAULT;
1202
1203 str[count] = 0;
1204 state = simple_strtoul(str, NULL, 0);
1205 state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
1206
1207 status = acpi_video_device_set_state(dev, state);
1208
1209 if (status)
1210 return -EFAULT;
1211
1212 return count;
1213 }
1214
1215 static int
1216 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
1217 {
1218 struct acpi_video_device *dev = seq->private;
1219 int i;
1220
1221
1222 if (!dev || !dev->brightness) {
1223 seq_printf(seq, "<not supported>\n");
1224 return 0;
1225 }
1226
1227 seq_printf(seq, "levels: ");
1228 for (i = 2; i < dev->brightness->count; i++)
1229 seq_printf(seq, " %d", dev->brightness->levels[i]);
1230 seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
1231
1232 return 0;
1233 }
1234
1235 static int
1236 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1237 {
1238 return single_open(file, acpi_video_device_brightness_seq_show,
1239 PDE(inode)->data);
1240 }
1241
1242 static ssize_t
1243 acpi_video_device_write_brightness(struct file *file,
1244 const char __user * buffer,
1245 size_t count, loff_t * data)
1246 {
1247 struct seq_file *m = file->private_data;
1248 struct acpi_video_device *dev = m->private;
1249 char str[5] = { 0 };
1250 unsigned int level = 0;
1251 int i;
1252
1253
1254 if (!dev || !dev->brightness || count + 1 > sizeof str)
1255 return -EINVAL;
1256
1257 if (copy_from_user(str, buffer, count))
1258 return -EFAULT;
1259
1260 str[count] = 0;
1261 level = simple_strtoul(str, NULL, 0);
1262
1263 if (level > 100)
1264 return -EFAULT;
1265
1266 /* validate through the list of available levels */
1267 for (i = 2; i < dev->brightness->count; i++)
1268 if (level == dev->brightness->levels[i]) {
1269 if (!acpi_video_device_lcd_set_level(dev, level))
1270 return count;
1271 break;
1272 }
1273
1274 return -EINVAL;
1275 }
1276
1277 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1278 {
1279 struct acpi_video_device *dev = seq->private;
1280 int status;
1281 int i;
1282 union acpi_object *edid = NULL;
1283
1284
1285 if (!dev)
1286 goto out;
1287
1288 status = acpi_video_device_EDID(dev, &edid, 128);
1289 if (ACPI_FAILURE(status)) {
1290 status = acpi_video_device_EDID(dev, &edid, 256);
1291 }
1292
1293 if (ACPI_FAILURE(status)) {
1294 goto out;
1295 }
1296
1297 if (edid && edid->type == ACPI_TYPE_BUFFER) {
1298 for (i = 0; i < edid->buffer.length; i++)
1299 seq_putc(seq, edid->buffer.pointer[i]);
1300 }
1301
1302 out:
1303 if (!edid)
1304 seq_printf(seq, "<not supported>\n");
1305 else
1306 kfree(edid);
1307
1308 return 0;
1309 }
1310
1311 static int
1312 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1313 {
1314 return single_open(file, acpi_video_device_EDID_seq_show,
1315 PDE(inode)->data);
1316 }
1317
1318 static int acpi_video_device_add_fs(struct acpi_device *device)
1319 {
1320 struct proc_dir_entry *entry, *device_dir;
1321 struct acpi_video_device *vid_dev;
1322
1323 vid_dev = acpi_driver_data(device);
1324 if (!vid_dev)
1325 return -ENODEV;
1326
1327 device_dir = proc_mkdir(acpi_device_bid(device),
1328 vid_dev->video->dir);
1329 if (!device_dir)
1330 return -ENOMEM;
1331
1332 /* 'info' [R] */
1333 entry = proc_create_data("info", S_IRUGO, device_dir,
1334 &acpi_video_device_info_fops, acpi_driver_data(device));
1335 if (!entry)
1336 goto err_remove_dir;
1337
1338 /* 'state' [R/W] */
1339 entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1340 device_dir,
1341 &acpi_video_device_state_fops,
1342 acpi_driver_data(device));
1343 if (!entry)
1344 goto err_remove_info;
1345
1346 /* 'brightness' [R/W] */
1347 entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1348 device_dir,
1349 &acpi_video_device_brightness_fops,
1350 acpi_driver_data(device));
1351 if (!entry)
1352 goto err_remove_state;
1353
1354 /* 'EDID' [R] */
1355 entry = proc_create_data("EDID", S_IRUGO, device_dir,
1356 &acpi_video_device_EDID_fops,
1357 acpi_driver_data(device));
1358 if (!entry)
1359 goto err_remove_brightness;
1360
1361 acpi_device_dir(device) = device_dir;
1362
1363 return 0;
1364
1365 err_remove_brightness:
1366 remove_proc_entry("brightness", device_dir);
1367 err_remove_state:
1368 remove_proc_entry("state", device_dir);
1369 err_remove_info:
1370 remove_proc_entry("info", device_dir);
1371 err_remove_dir:
1372 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1373 return -ENOMEM;
1374 }
1375
1376 static int acpi_video_device_remove_fs(struct acpi_device *device)
1377 {
1378 struct acpi_video_device *vid_dev;
1379 struct proc_dir_entry *device_dir;
1380
1381 vid_dev = acpi_driver_data(device);
1382 if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1383 return -ENODEV;
1384
1385 device_dir = acpi_device_dir(device);
1386 if (device_dir) {
1387 remove_proc_entry("info", device_dir);
1388 remove_proc_entry("state", device_dir);
1389 remove_proc_entry("brightness", device_dir);
1390 remove_proc_entry("EDID", device_dir);
1391 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1392 acpi_device_dir(device) = NULL;
1393 }
1394
1395 return 0;
1396 }
1397
1398 /* video bus */
1399 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1400 {
1401 struct acpi_video_bus *video = seq->private;
1402
1403
1404 if (!video)
1405 goto end;
1406
1407 seq_printf(seq, "Switching heads: %s\n",
1408 video->flags.multihead ? "yes" : "no");
1409 seq_printf(seq, "Video ROM: %s\n",
1410 video->flags.rom ? "yes" : "no");
1411 seq_printf(seq, "Device to be POSTed on boot: %s\n",
1412 video->flags.post ? "yes" : "no");
1413
1414 end:
1415 return 0;
1416 }
1417
1418 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1419 {
1420 return single_open(file, acpi_video_bus_info_seq_show,
1421 PDE(inode)->data);
1422 }
1423
1424 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1425 {
1426 struct acpi_video_bus *video = seq->private;
1427
1428
1429 if (!video)
1430 goto end;
1431
1432 printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1433 seq_printf(seq, "<TODO>\n");
1434
1435 end:
1436 return 0;
1437 }
1438
1439 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1440 {
1441 return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1442 }
1443
1444 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1445 {
1446 struct acpi_video_bus *video = seq->private;
1447 unsigned long long options;
1448 int status;
1449
1450
1451 if (!video)
1452 goto end;
1453
1454 status = acpi_video_bus_POST_options(video, &options);
1455 if (ACPI_SUCCESS(status)) {
1456 if (!(options & 1)) {
1457 printk(KERN_WARNING PREFIX
1458 "The motherboard VGA device is not listed as a possible POST device.\n");
1459 printk(KERN_WARNING PREFIX
1460 "This indicates a BIOS bug. Please contact the manufacturer.\n");
1461 }
1462 printk(KERN_WARNING "%llx\n", options);
1463 seq_printf(seq, "can POST: <integrated video>");
1464 if (options & 2)
1465 seq_printf(seq, " <PCI video>");
1466 if (options & 4)
1467 seq_printf(seq, " <AGP video>");
1468 seq_putc(seq, '\n');
1469 } else
1470 seq_printf(seq, "<not supported>\n");
1471 end:
1472 return 0;
1473 }
1474
1475 static int
1476 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1477 {
1478 return single_open(file, acpi_video_bus_POST_info_seq_show,
1479 PDE(inode)->data);
1480 }
1481
1482 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1483 {
1484 struct acpi_video_bus *video = seq->private;
1485 int status;
1486 unsigned long long id;
1487
1488
1489 if (!video)
1490 goto end;
1491
1492 status = acpi_video_bus_get_POST(video, &id);
1493 if (!ACPI_SUCCESS(status)) {
1494 seq_printf(seq, "<not supported>\n");
1495 goto end;
1496 }
1497 seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1498
1499 end:
1500 return 0;
1501 }
1502
1503 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1504 {
1505 struct acpi_video_bus *video = seq->private;
1506
1507
1508 seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1509
1510 return 0;
1511 }
1512
1513 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1514 {
1515 return single_open(file, acpi_video_bus_POST_seq_show,
1516 PDE(inode)->data);
1517 }
1518
1519 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1520 {
1521 return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1522 }
1523
1524 static ssize_t
1525 acpi_video_bus_write_POST(struct file *file,
1526 const char __user * buffer,
1527 size_t count, loff_t * data)
1528 {
1529 int status;
1530 struct seq_file *m = file->private_data;
1531 struct acpi_video_bus *video = m->private;
1532 char str[12] = { 0 };
1533 unsigned long long opt, options;
1534
1535
1536 if (!video || count + 1 > sizeof str)
1537 return -EINVAL;
1538
1539 status = acpi_video_bus_POST_options(video, &options);
1540 if (!ACPI_SUCCESS(status))
1541 return -EINVAL;
1542
1543 if (copy_from_user(str, buffer, count))
1544 return -EFAULT;
1545
1546 str[count] = 0;
1547 opt = strtoul(str, NULL, 0);
1548 if (opt > 3)
1549 return -EFAULT;
1550
1551 /* just in case an OEM 'forgot' the motherboard... */
1552 options |= 1;
1553
1554 if (options & (1ul << opt)) {
1555 status = acpi_video_bus_set_POST(video, opt);
1556 if (!ACPI_SUCCESS(status))
1557 return -EFAULT;
1558
1559 }
1560
1561 return count;
1562 }
1563
1564 static ssize_t
1565 acpi_video_bus_write_DOS(struct file *file,
1566 const char __user * buffer,
1567 size_t count, loff_t * data)
1568 {
1569 int status;
1570 struct seq_file *m = file->private_data;
1571 struct acpi_video_bus *video = m->private;
1572 char str[12] = { 0 };
1573 unsigned long opt;
1574
1575
1576 if (!video || count + 1 > sizeof str)
1577 return -EINVAL;
1578
1579 if (copy_from_user(str, buffer, count))
1580 return -EFAULT;
1581
1582 str[count] = 0;
1583 opt = strtoul(str, NULL, 0);
1584 if (opt > 7)
1585 return -EFAULT;
1586
1587 status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1588
1589 if (!ACPI_SUCCESS(status))
1590 return -EFAULT;
1591
1592 return count;
1593 }
1594
1595 static int acpi_video_bus_add_fs(struct acpi_device *device)
1596 {
1597 struct acpi_video_bus *video = acpi_driver_data(device);
1598 struct proc_dir_entry *device_dir;
1599 struct proc_dir_entry *entry;
1600
1601 device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1602 if (!device_dir)
1603 return -ENOMEM;
1604
1605 /* 'info' [R] */
1606 entry = proc_create_data("info", S_IRUGO, device_dir,
1607 &acpi_video_bus_info_fops,
1608 acpi_driver_data(device));
1609 if (!entry)
1610 goto err_remove_dir;
1611
1612 /* 'ROM' [R] */
1613 entry = proc_create_data("ROM", S_IRUGO, device_dir,
1614 &acpi_video_bus_ROM_fops,
1615 acpi_driver_data(device));
1616 if (!entry)
1617 goto err_remove_info;
1618
1619 /* 'POST_info' [R] */
1620 entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1621 &acpi_video_bus_POST_info_fops,
1622 acpi_driver_data(device));
1623 if (!entry)
1624 goto err_remove_rom;
1625
1626 /* 'POST' [R/W] */
1627 entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1628 device_dir,
1629 &acpi_video_bus_POST_fops,
1630 acpi_driver_data(device));
1631 if (!entry)
1632 goto err_remove_post_info;
1633
1634 /* 'DOS' [R/W] */
1635 entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1636 device_dir,
1637 &acpi_video_bus_DOS_fops,
1638 acpi_driver_data(device));
1639 if (!entry)
1640 goto err_remove_post;
1641
1642 video->dir = acpi_device_dir(device) = device_dir;
1643 return 0;
1644
1645 err_remove_post:
1646 remove_proc_entry("POST", device_dir);
1647 err_remove_post_info:
1648 remove_proc_entry("POST_info", device_dir);
1649 err_remove_rom:
1650 remove_proc_entry("ROM", device_dir);
1651 err_remove_info:
1652 remove_proc_entry("info", device_dir);
1653 err_remove_dir:
1654 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1655 return -ENOMEM;
1656 }
1657
1658 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1659 {
1660 struct proc_dir_entry *device_dir = acpi_device_dir(device);
1661
1662 if (device_dir) {
1663 remove_proc_entry("info", device_dir);
1664 remove_proc_entry("ROM", device_dir);
1665 remove_proc_entry("POST_info", device_dir);
1666 remove_proc_entry("POST", device_dir);
1667 remove_proc_entry("DOS", device_dir);
1668 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1669 acpi_device_dir(device) = NULL;
1670 }
1671
1672 return 0;
1673 }
1674
1675 /* --------------------------------------------------------------------------
1676 Driver Interface
1677 -------------------------------------------------------------------------- */
1678
1679 /* device interface */
1680 static struct acpi_video_device_attrib*
1681 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1682 {
1683 struct acpi_video_enumerated_device *ids;
1684 int i;
1685
1686 for (i = 0; i < video->attached_count; i++) {
1687 ids = &video->attached_array[i];
1688 if ((ids->value.int_val & 0xffff) == device_id)
1689 return &ids->value.attrib;
1690 }
1691
1692 return NULL;
1693 }
1694
1695 static int
1696 acpi_video_bus_get_one_device(struct acpi_device *device,
1697 struct acpi_video_bus *video)
1698 {
1699 unsigned long long device_id;
1700 int status;
1701 struct acpi_video_device *data;
1702 struct acpi_video_device_attrib* attribute;
1703
1704 if (!device || !video)
1705 return -EINVAL;
1706
1707 status =
1708 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1709 if (ACPI_SUCCESS(status)) {
1710
1711 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1712 if (!data)
1713 return -ENOMEM;
1714
1715 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1716 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1717 device->driver_data = data;
1718
1719 data->device_id = device_id;
1720 data->video = video;
1721 data->dev = device;
1722
1723 attribute = acpi_video_get_device_attr(video, device_id);
1724
1725 if((attribute != NULL) && attribute->device_id_scheme) {
1726 switch (attribute->display_type) {
1727 case ACPI_VIDEO_DISPLAY_CRT:
1728 data->flags.crt = 1;
1729 break;
1730 case ACPI_VIDEO_DISPLAY_TV:
1731 data->flags.tvout = 1;
1732 break;
1733 case ACPI_VIDEO_DISPLAY_DVI:
1734 data->flags.dvi = 1;
1735 break;
1736 case ACPI_VIDEO_DISPLAY_LCD:
1737 data->flags.lcd = 1;
1738 break;
1739 default:
1740 data->flags.unknown = 1;
1741 break;
1742 }
1743 if(attribute->bios_can_detect)
1744 data->flags.bios = 1;
1745 } else
1746 data->flags.unknown = 1;
1747
1748 acpi_video_device_bind(video, data);
1749 acpi_video_device_find_cap(data);
1750
1751 status = acpi_install_notify_handler(device->handle,
1752 ACPI_DEVICE_NOTIFY,
1753 acpi_video_device_notify,
1754 data);
1755 if (ACPI_FAILURE(status)) {
1756 printk(KERN_ERR PREFIX
1757 "Error installing notify handler\n");
1758 if(data->brightness)
1759 kfree(data->brightness->levels);
1760 kfree(data->brightness);
1761 kfree(data);
1762 return -ENODEV;
1763 }
1764
1765 mutex_lock(&video->device_list_lock);
1766 list_add_tail(&data->entry, &video->video_device_list);
1767 mutex_unlock(&video->device_list_lock);
1768
1769 acpi_video_device_add_fs(device);
1770
1771 return 0;
1772 }
1773
1774 return -ENOENT;
1775 }
1776
1777 /*
1778 * Arg:
1779 * video : video bus device
1780 *
1781 * Return:
1782 * none
1783 *
1784 * Enumerate the video device list of the video bus,
1785 * bind the ids with the corresponding video devices
1786 * under the video bus.
1787 */
1788
1789 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1790 {
1791 struct acpi_video_device *dev;
1792
1793 mutex_lock(&video->device_list_lock);
1794
1795 list_for_each_entry(dev, &video->video_device_list, entry)
1796 acpi_video_device_bind(video, dev);
1797
1798 mutex_unlock(&video->device_list_lock);
1799 }
1800
1801 /*
1802 * Arg:
1803 * video : video bus device
1804 * device : video output device under the video
1805 * bus
1806 *
1807 * Return:
1808 * none
1809 *
1810 * Bind the ids with the corresponding video devices
1811 * under the video bus.
1812 */
1813
1814 static void
1815 acpi_video_device_bind(struct acpi_video_bus *video,
1816 struct acpi_video_device *device)
1817 {
1818 struct acpi_video_enumerated_device *ids;
1819 int i;
1820
1821 for (i = 0; i < video->attached_count; i++) {
1822 ids = &video->attached_array[i];
1823 if (device->device_id == (ids->value.int_val & 0xffff)) {
1824 ids->bind_info = device;
1825 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1826 }
1827 }
1828 }
1829
1830 /*
1831 * Arg:
1832 * video : video bus device
1833 *
1834 * Return:
1835 * < 0 : error
1836 *
1837 * Call _DOD to enumerate all devices attached to display adapter
1838 *
1839 */
1840
1841 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1842 {
1843 int status;
1844 int count;
1845 int i;
1846 struct acpi_video_enumerated_device *active_list;
1847 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1848 union acpi_object *dod = NULL;
1849 union acpi_object *obj;
1850
1851 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1852 if (!ACPI_SUCCESS(status)) {
1853 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1854 return status;
1855 }
1856
1857 dod = buffer.pointer;
1858 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1859 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1860 status = -EFAULT;
1861 goto out;
1862 }
1863
1864 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1865 dod->package.count));
1866
1867 active_list = kcalloc(1 + dod->package.count,
1868 sizeof(struct acpi_video_enumerated_device),
1869 GFP_KERNEL);
1870 if (!active_list) {
1871 status = -ENOMEM;
1872 goto out;
1873 }
1874
1875 count = 0;
1876 for (i = 0; i < dod->package.count; i++) {
1877 obj = &dod->package.elements[i];
1878
1879 if (obj->type != ACPI_TYPE_INTEGER) {
1880 printk(KERN_ERR PREFIX
1881 "Invalid _DOD data in element %d\n", i);
1882 continue;
1883 }
1884
1885 active_list[count].value.int_val = obj->integer.value;
1886 active_list[count].bind_info = NULL;
1887 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1888 (int)obj->integer.value));
1889 count++;
1890 }
1891
1892 kfree(video->attached_array);
1893
1894 video->attached_array = active_list;
1895 video->attached_count = count;
1896
1897 out:
1898 kfree(buffer.pointer);
1899 return status;
1900 }
1901
1902 static int
1903 acpi_video_get_next_level(struct acpi_video_device *device,
1904 u32 level_current, u32 event)
1905 {
1906 int min, max, min_above, max_below, i, l, delta = 255;
1907 max = max_below = 0;
1908 min = min_above = 255;
1909 /* Find closest level to level_current */
1910 for (i = 2; i < device->brightness->count; i++) {
1911 l = device->brightness->levels[i];
1912 if (abs(l - level_current) < abs(delta)) {
1913 delta = l - level_current;
1914 if (!delta)
1915 break;
1916 }
1917 }
1918 /* Ajust level_current to closest available level */
1919 level_current += delta;
1920 for (i = 2; i < device->brightness->count; i++) {
1921 l = device->brightness->levels[i];
1922 if (l < min)
1923 min = l;
1924 if (l > max)
1925 max = l;
1926 if (l < min_above && l > level_current)
1927 min_above = l;
1928 if (l > max_below && l < level_current)
1929 max_below = l;
1930 }
1931
1932 switch (event) {
1933 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1934 return (level_current < max) ? min_above : min;
1935 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1936 return (level_current < max) ? min_above : max;
1937 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1938 return (level_current > min) ? max_below : min;
1939 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1940 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1941 return 0;
1942 default:
1943 return level_current;
1944 }
1945 }
1946
1947 static int
1948 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1949 {
1950 unsigned long long level_current, level_next;
1951 int result = -EINVAL;
1952
1953 if (!device->brightness)
1954 goto out;
1955
1956 result = acpi_video_device_lcd_get_level_current(device,
1957 &level_current);
1958 if (result)
1959 goto out;
1960
1961 level_next = acpi_video_get_next_level(device, level_current, event);
1962
1963 result = acpi_video_device_lcd_set_level(device, level_next);
1964
1965 out:
1966 if (result)
1967 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1968
1969 return result;
1970 }
1971
1972 static int
1973 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1974 struct acpi_device *device)
1975 {
1976 int status = 0;
1977 struct acpi_device *dev;
1978
1979 acpi_video_device_enumerate(video);
1980
1981 list_for_each_entry(dev, &device->children, node) {
1982
1983 status = acpi_video_bus_get_one_device(dev, video);
1984 if (ACPI_FAILURE(status)) {
1985 printk(KERN_WARNING PREFIX
1986 "Cant attach device");
1987 continue;
1988 }
1989 }
1990 return status;
1991 }
1992
1993 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1994 {
1995 acpi_status status;
1996 struct acpi_video_bus *video;
1997
1998
1999 if (!device || !device->video)
2000 return -ENOENT;
2001
2002 video = device->video;
2003
2004 acpi_video_device_remove_fs(device->dev);
2005
2006 status = acpi_remove_notify_handler(device->dev->handle,
2007 ACPI_DEVICE_NOTIFY,
2008 acpi_video_device_notify);
2009 if (device->backlight) {
2010 sysfs_remove_link(&device->backlight->dev.kobj, "device");
2011 backlight_device_unregister(device->backlight);
2012 device->backlight = NULL;
2013 }
2014 if (device->cdev) {
2015 sysfs_remove_link(&device->dev->dev.kobj,
2016 "thermal_cooling");
2017 sysfs_remove_link(&device->cdev->device.kobj,
2018 "device");
2019 thermal_cooling_device_unregister(device->cdev);
2020 device->cdev = NULL;
2021 }
2022 video_output_unregister(device->output_dev);
2023
2024 return 0;
2025 }
2026
2027 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2028 {
2029 int status;
2030 struct acpi_video_device *dev, *next;
2031
2032 mutex_lock(&video->device_list_lock);
2033
2034 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2035
2036 status = acpi_video_bus_put_one_device(dev);
2037 if (ACPI_FAILURE(status))
2038 printk(KERN_WARNING PREFIX
2039 "hhuuhhuu bug in acpi video driver.\n");
2040
2041 if (dev->brightness) {
2042 kfree(dev->brightness->levels);
2043 kfree(dev->brightness);
2044 }
2045 list_del(&dev->entry);
2046 kfree(dev);
2047 }
2048
2049 mutex_unlock(&video->device_list_lock);
2050
2051 return 0;
2052 }
2053
2054 /* acpi_video interface */
2055
2056 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
2057 {
2058 return acpi_video_bus_DOS(video, 0, 0);
2059 }
2060
2061 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
2062 {
2063 return acpi_video_bus_DOS(video, 0, 1);
2064 }
2065
2066 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
2067 {
2068 struct acpi_video_bus *video = acpi_driver_data(device);
2069 struct input_dev *input;
2070 int keycode;
2071
2072 if (!video)
2073 return;
2074
2075 input = video->input;
2076
2077 switch (event) {
2078 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
2079 * most likely via hotkey. */
2080 acpi_bus_generate_proc_event(device, event, 0);
2081 keycode = KEY_SWITCHVIDEOMODE;
2082 break;
2083
2084 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
2085 * connector. */
2086 acpi_video_device_enumerate(video);
2087 acpi_video_device_rebind(video);
2088 acpi_bus_generate_proc_event(device, event, 0);
2089 keycode = KEY_SWITCHVIDEOMODE;
2090 break;
2091
2092 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
2093 acpi_bus_generate_proc_event(device, event, 0);
2094 keycode = KEY_SWITCHVIDEOMODE;
2095 break;
2096 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
2097 acpi_bus_generate_proc_event(device, event, 0);
2098 keycode = KEY_VIDEO_NEXT;
2099 break;
2100 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
2101 acpi_bus_generate_proc_event(device, event, 0);
2102 keycode = KEY_VIDEO_PREV;
2103 break;
2104
2105 default:
2106 keycode = KEY_UNKNOWN;
2107 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2108 "Unsupported event [0x%x]\n", event));
2109 break;
2110 }
2111
2112 acpi_notifier_call_chain(device, event, 0);
2113 input_report_key(input, keycode, 1);
2114 input_sync(input);
2115 input_report_key(input, keycode, 0);
2116 input_sync(input);
2117
2118 return;
2119 }
2120
2121 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
2122 {
2123 struct acpi_video_device *video_device = data;
2124 struct acpi_device *device = NULL;
2125 struct acpi_video_bus *bus;
2126 struct input_dev *input;
2127 int keycode;
2128
2129 if (!video_device)
2130 return;
2131
2132 device = video_device->dev;
2133 bus = video_device->video;
2134 input = bus->input;
2135
2136 switch (event) {
2137 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
2138 if (brightness_switch_enabled)
2139 acpi_video_switch_brightness(video_device, event);
2140 acpi_bus_generate_proc_event(device, event, 0);
2141 keycode = KEY_BRIGHTNESS_CYCLE;
2142 break;
2143 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
2144 if (brightness_switch_enabled)
2145 acpi_video_switch_brightness(video_device, event);
2146 acpi_bus_generate_proc_event(device, event, 0);
2147 keycode = KEY_BRIGHTNESSUP;
2148 break;
2149 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
2150 if (brightness_switch_enabled)
2151 acpi_video_switch_brightness(video_device, event);
2152 acpi_bus_generate_proc_event(device, event, 0);
2153 keycode = KEY_BRIGHTNESSDOWN;
2154 break;
2155 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
2156 if (brightness_switch_enabled)
2157 acpi_video_switch_brightness(video_device, event);
2158 acpi_bus_generate_proc_event(device, event, 0);
2159 keycode = KEY_BRIGHTNESS_ZERO;
2160 break;
2161 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
2162 if (brightness_switch_enabled)
2163 acpi_video_switch_brightness(video_device, event);
2164 acpi_bus_generate_proc_event(device, event, 0);
2165 keycode = KEY_DISPLAY_OFF;
2166 break;
2167 default:
2168 keycode = KEY_UNKNOWN;
2169 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2170 "Unsupported event [0x%x]\n", event));
2171 break;
2172 }
2173
2174 acpi_notifier_call_chain(device, event, 0);
2175 input_report_key(input, keycode, 1);
2176 input_sync(input);
2177 input_report_key(input, keycode, 0);
2178 input_sync(input);
2179
2180 return;
2181 }
2182
2183 static int instance;
2184 static int acpi_video_resume(struct acpi_device *device)
2185 {
2186 struct acpi_video_bus *video;
2187 struct acpi_video_device *video_device;
2188 int i;
2189
2190 if (!device || !acpi_driver_data(device))
2191 return -EINVAL;
2192
2193 video = acpi_driver_data(device);
2194
2195 for (i = 0; i < video->attached_count; i++) {
2196 video_device = video->attached_array[i].bind_info;
2197 if (video_device && video_device->backlight)
2198 acpi_video_set_brightness(video_device->backlight);
2199 }
2200 return AE_OK;
2201 }
2202
2203 static int acpi_video_bus_add(struct acpi_device *device)
2204 {
2205 struct acpi_video_bus *video;
2206 struct input_dev *input;
2207 int error;
2208
2209 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2210 if (!video)
2211 return -ENOMEM;
2212
2213 /* a hack to fix the duplicate name "VID" problem on T61 */
2214 if (!strcmp(device->pnp.bus_id, "VID")) {
2215 if (instance)
2216 device->pnp.bus_id[3] = '0' + instance;
2217 instance ++;
2218 }
2219 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2220 if (!strcmp(device->pnp.bus_id, "VGA")) {
2221 if (instance)
2222 device->pnp.bus_id[3] = '0' + instance;
2223 instance++;
2224 }
2225
2226 video->device = device;
2227 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2228 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2229 device->driver_data = video;
2230
2231 acpi_video_bus_find_cap(video);
2232 error = acpi_video_bus_check(video);
2233 if (error)
2234 goto err_free_video;
2235
2236 error = acpi_video_bus_add_fs(device);
2237 if (error)
2238 goto err_free_video;
2239
2240 mutex_init(&video->device_list_lock);
2241 INIT_LIST_HEAD(&video->video_device_list);
2242
2243 acpi_video_bus_get_devices(video, device);
2244 acpi_video_bus_start_devices(video);
2245
2246 video->input = input = input_allocate_device();
2247 if (!input) {
2248 error = -ENOMEM;
2249 goto err_stop_video;
2250 }
2251
2252 snprintf(video->phys, sizeof(video->phys),
2253 "%s/video/input0", acpi_device_hid(video->device));
2254
2255 input->name = acpi_device_name(video->device);
2256 input->phys = video->phys;
2257 input->id.bustype = BUS_HOST;
2258 input->id.product = 0x06;
2259 input->dev.parent = &device->dev;
2260 input->evbit[0] = BIT(EV_KEY);
2261 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2262 set_bit(KEY_VIDEO_NEXT, input->keybit);
2263 set_bit(KEY_VIDEO_PREV, input->keybit);
2264 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2265 set_bit(KEY_BRIGHTNESSUP, input->keybit);
2266 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2267 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2268 set_bit(KEY_DISPLAY_OFF, input->keybit);
2269 set_bit(KEY_UNKNOWN, input->keybit);
2270
2271 error = input_register_device(input);
2272 if (error)
2273 goto err_free_input_dev;
2274
2275 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
2276 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2277 video->flags.multihead ? "yes" : "no",
2278 video->flags.rom ? "yes" : "no",
2279 video->flags.post ? "yes" : "no");
2280
2281 return 0;
2282
2283 err_free_input_dev:
2284 input_free_device(input);
2285 err_stop_video:
2286 acpi_video_bus_stop_devices(video);
2287 acpi_video_bus_put_devices(video);
2288 kfree(video->attached_array);
2289 acpi_video_bus_remove_fs(device);
2290 err_free_video:
2291 kfree(video);
2292 device->driver_data = NULL;
2293
2294 return error;
2295 }
2296
2297 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2298 {
2299 struct acpi_video_bus *video = NULL;
2300
2301
2302 if (!device || !acpi_driver_data(device))
2303 return -EINVAL;
2304
2305 video = acpi_driver_data(device);
2306
2307 acpi_video_bus_stop_devices(video);
2308 acpi_video_bus_put_devices(video);
2309 acpi_video_bus_remove_fs(device);
2310
2311 input_unregister_device(video->input);
2312 kfree(video->attached_array);
2313 kfree(video);
2314
2315 return 0;
2316 }
2317
2318 static int __init intel_opregion_present(void)
2319 {
2320 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
2321 struct pci_dev *dev = NULL;
2322 u32 address;
2323
2324 for_each_pci_dev(dev) {
2325 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2326 continue;
2327 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2328 continue;
2329 pci_read_config_dword(dev, 0xfc, &address);
2330 if (!address)
2331 continue;
2332 return 1;
2333 }
2334 #endif
2335 return 0;
2336 }
2337
2338 int acpi_video_register(void)
2339 {
2340 int result = 0;
2341 if (register_count) {
2342 /*
2343 * if the function of acpi_video_register is already called,
2344 * don't register the acpi_vide_bus again and return no error.
2345 */
2346 return 0;
2347 }
2348
2349 acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2350 if (!acpi_video_dir)
2351 return -ENODEV;
2352
2353 result = acpi_bus_register_driver(&acpi_video_bus);
2354 if (result < 0) {
2355 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2356 return -ENODEV;
2357 }
2358
2359 /*
2360 * When the acpi_video_bus is loaded successfully, increase
2361 * the counter reference.
2362 */
2363 register_count = 1;
2364
2365 return 0;
2366 }
2367 EXPORT_SYMBOL(acpi_video_register);
2368
2369 void acpi_video_unregister(void)
2370 {
2371 if (!register_count) {
2372 /*
2373 * If the acpi video bus is already unloaded, don't
2374 * unload it again and return directly.
2375 */
2376 return;
2377 }
2378 acpi_bus_unregister_driver(&acpi_video_bus);
2379
2380 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2381
2382 register_count = 0;
2383
2384 return;
2385 }
2386 EXPORT_SYMBOL(acpi_video_unregister);
2387
2388 /*
2389 * This is kind of nasty. Hardware using Intel chipsets may require
2390 * the video opregion code to be run first in order to initialise
2391 * state before any ACPI video calls are made. To handle this we defer
2392 * registration of the video class until the opregion code has run.
2393 */
2394
2395 static int __init acpi_video_init(void)
2396 {
2397 dmi_check_system(video_dmi_table);
2398
2399 if (intel_opregion_present())
2400 return 0;
2401
2402 return acpi_video_register();
2403 }
2404
2405 static void __exit acpi_video_exit(void)
2406 {
2407 acpi_video_unregister();
2408
2409 return;
2410 }
2411
2412 module_init(acpi_video_init);
2413 module_exit(acpi_video_exit);
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