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[mirror_ubuntu-bionic-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 <linux/slab.h>
43 #include <asm/uaccess.h>
44 #include <linux/dmi.h>
45 #include <acpi/acpi_bus.h>
46 #include <acpi/acpi_drivers.h>
47
48 #define PREFIX "ACPI: "
49
50 #define ACPI_VIDEO_CLASS "video"
51 #define ACPI_VIDEO_BUS_NAME "Video Bus"
52 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
53 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
54 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
55 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
56 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
57 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
58
59 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
60 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
61 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
62 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
63 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
64
65 #define MAX_NAME_LEN 20
66
67 #define ACPI_VIDEO_DISPLAY_CRT 1
68 #define ACPI_VIDEO_DISPLAY_TV 2
69 #define ACPI_VIDEO_DISPLAY_DVI 3
70 #define ACPI_VIDEO_DISPLAY_LCD 4
71
72 #define _COMPONENT ACPI_VIDEO_COMPONENT
73 ACPI_MODULE_NAME("video");
74
75 MODULE_AUTHOR("Bruno Ducrot");
76 MODULE_DESCRIPTION("ACPI Video Driver");
77 MODULE_LICENSE("GPL");
78
79 static int brightness_switch_enabled = 1;
80 module_param(brightness_switch_enabled, bool, 0644);
81
82 /*
83 * By default, we don't allow duplicate ACPI video bus devices
84 * under the same VGA controller
85 */
86 static int allow_duplicates;
87 module_param(allow_duplicates, 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 int acpi_video_resume(struct acpi_device *device);
93 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
94
95 static const struct acpi_device_id video_device_ids[] = {
96 {ACPI_VIDEO_HID, 0},
97 {"", 0},
98 };
99 MODULE_DEVICE_TABLE(acpi, video_device_ids);
100
101 static struct acpi_driver acpi_video_bus = {
102 .name = "video",
103 .class = ACPI_VIDEO_CLASS,
104 .ids = video_device_ids,
105 .ops = {
106 .add = acpi_video_bus_add,
107 .remove = acpi_video_bus_remove,
108 .resume = acpi_video_resume,
109 .notify = acpi_video_bus_notify,
110 },
111 };
112
113 struct acpi_video_bus_flags {
114 u8 multihead:1; /* can switch video heads */
115 u8 rom:1; /* can retrieve a video rom */
116 u8 post:1; /* can configure the head to */
117 u8 reserved:5;
118 };
119
120 struct acpi_video_bus_cap {
121 u8 _DOS:1; /*Enable/Disable output switching */
122 u8 _DOD:1; /*Enumerate all devices attached to display adapter */
123 u8 _ROM:1; /*Get ROM Data */
124 u8 _GPD:1; /*Get POST Device */
125 u8 _SPD:1; /*Set POST Device */
126 u8 _VPO:1; /*Video POST Options */
127 u8 reserved:2;
128 };
129
130 struct acpi_video_device_attrib {
131 u32 display_index:4; /* A zero-based instance of the Display */
132 u32 display_port_attachment:4; /*This field differentiates the display type */
133 u32 display_type:4; /*Describe the specific type in use */
134 u32 vendor_specific:4; /*Chipset Vendor Specific */
135 u32 bios_can_detect:1; /*BIOS can detect the device */
136 u32 depend_on_vga:1; /*Non-VGA output device whose power is related to
137 the VGA device. */
138 u32 pipe_id:3; /*For VGA multiple-head devices. */
139 u32 reserved:10; /*Must be 0 */
140 u32 device_id_scheme:1; /*Device ID Scheme */
141 };
142
143 struct acpi_video_enumerated_device {
144 union {
145 u32 int_val;
146 struct acpi_video_device_attrib attrib;
147 } value;
148 struct acpi_video_device *bind_info;
149 };
150
151 struct acpi_video_bus {
152 struct acpi_device *device;
153 u8 dos_setting;
154 struct acpi_video_enumerated_device *attached_array;
155 u8 attached_count;
156 struct acpi_video_bus_cap cap;
157 struct acpi_video_bus_flags flags;
158 struct list_head video_device_list;
159 struct mutex device_list_lock; /* protects video_device_list */
160 struct proc_dir_entry *dir;
161 struct input_dev *input;
162 char phys[32]; /* for input device */
163 };
164
165 struct acpi_video_device_flags {
166 u8 crt:1;
167 u8 lcd:1;
168 u8 tvout:1;
169 u8 dvi:1;
170 u8 bios:1;
171 u8 unknown:1;
172 u8 reserved:2;
173 };
174
175 struct acpi_video_device_cap {
176 u8 _ADR:1; /*Return the unique ID */
177 u8 _BCL:1; /*Query list of brightness control levels supported */
178 u8 _BCM:1; /*Set the brightness level */
179 u8 _BQC:1; /* Get current brightness level */
180 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
181 u8 _DDC:1; /*Return the EDID for this device */
182 u8 _DCS:1; /*Return status of output device */
183 u8 _DGS:1; /*Query graphics state */
184 u8 _DSS:1; /*Device state set */
185 };
186
187 struct acpi_video_brightness_flags {
188 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
189 u8 _BCL_reversed:1; /* _BCL package is in a reversed order*/
190 u8 _BCL_use_index:1; /* levels in _BCL are index values */
191 u8 _BCM_use_index:1; /* input of _BCM is an index value */
192 u8 _BQC_use_index:1; /* _BQC returns an index value */
193 };
194
195 struct acpi_video_device_brightness {
196 int curr;
197 int count;
198 int *levels;
199 struct acpi_video_brightness_flags flags;
200 };
201
202 struct acpi_video_device {
203 unsigned long device_id;
204 struct acpi_video_device_flags flags;
205 struct acpi_video_device_cap cap;
206 struct list_head entry;
207 struct acpi_video_bus *video;
208 struct acpi_device *dev;
209 struct acpi_video_device_brightness *brightness;
210 struct backlight_device *backlight;
211 struct thermal_cooling_device *cooling_dev;
212 struct output_device *output_dev;
213 };
214
215 /* bus */
216 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
217 static const struct file_operations acpi_video_bus_info_fops = {
218 .owner = THIS_MODULE,
219 .open = acpi_video_bus_info_open_fs,
220 .read = seq_read,
221 .llseek = seq_lseek,
222 .release = single_release,
223 };
224
225 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
226 static const struct file_operations acpi_video_bus_ROM_fops = {
227 .owner = THIS_MODULE,
228 .open = acpi_video_bus_ROM_open_fs,
229 .read = seq_read,
230 .llseek = seq_lseek,
231 .release = single_release,
232 };
233
234 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
235 struct file *file);
236 static const struct file_operations acpi_video_bus_POST_info_fops = {
237 .owner = THIS_MODULE,
238 .open = acpi_video_bus_POST_info_open_fs,
239 .read = seq_read,
240 .llseek = seq_lseek,
241 .release = single_release,
242 };
243
244 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
245 static ssize_t acpi_video_bus_write_POST(struct file *file,
246 const char __user *buffer, size_t count, loff_t *data);
247 static const struct file_operations acpi_video_bus_POST_fops = {
248 .owner = THIS_MODULE,
249 .open = acpi_video_bus_POST_open_fs,
250 .read = seq_read,
251 .write = acpi_video_bus_write_POST,
252 .llseek = seq_lseek,
253 .release = single_release,
254 };
255
256 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
257 static ssize_t acpi_video_bus_write_DOS(struct file *file,
258 const char __user *buffer, size_t count, loff_t *data);
259 static const struct file_operations acpi_video_bus_DOS_fops = {
260 .owner = THIS_MODULE,
261 .open = acpi_video_bus_DOS_open_fs,
262 .read = seq_read,
263 .write = acpi_video_bus_write_DOS,
264 .llseek = seq_lseek,
265 .release = single_release,
266 };
267
268 /* device */
269 static int acpi_video_device_info_open_fs(struct inode *inode,
270 struct file *file);
271 static const struct file_operations acpi_video_device_info_fops = {
272 .owner = THIS_MODULE,
273 .open = acpi_video_device_info_open_fs,
274 .read = seq_read,
275 .llseek = seq_lseek,
276 .release = single_release,
277 };
278
279 static int acpi_video_device_state_open_fs(struct inode *inode,
280 struct file *file);
281 static ssize_t acpi_video_device_write_state(struct file *file,
282 const char __user *buffer, size_t count, loff_t *data);
283 static const struct file_operations acpi_video_device_state_fops = {
284 .owner = THIS_MODULE,
285 .open = acpi_video_device_state_open_fs,
286 .read = seq_read,
287 .write = acpi_video_device_write_state,
288 .llseek = seq_lseek,
289 .release = single_release,
290 };
291
292 static int acpi_video_device_brightness_open_fs(struct inode *inode,
293 struct file *file);
294 static ssize_t acpi_video_device_write_brightness(struct file *file,
295 const char __user *buffer, size_t count, loff_t *data);
296 static const struct file_operations acpi_video_device_brightness_fops = {
297 .owner = THIS_MODULE,
298 .open = acpi_video_device_brightness_open_fs,
299 .read = seq_read,
300 .write = acpi_video_device_write_brightness,
301 .llseek = seq_lseek,
302 .release = single_release,
303 };
304
305 static int acpi_video_device_EDID_open_fs(struct inode *inode,
306 struct file *file);
307 static const struct file_operations acpi_video_device_EDID_fops = {
308 .owner = THIS_MODULE,
309 .open = acpi_video_device_EDID_open_fs,
310 .read = seq_read,
311 .llseek = seq_lseek,
312 .release = single_release,
313 };
314
315 static const char device_decode[][30] = {
316 "motherboard VGA device",
317 "PCI VGA device",
318 "AGP VGA device",
319 "UNKNOWN",
320 };
321
322 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
323 static void acpi_video_device_rebind(struct acpi_video_bus *video);
324 static void acpi_video_device_bind(struct acpi_video_bus *video,
325 struct acpi_video_device *device);
326 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
327 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
328 int level);
329 static int acpi_video_device_lcd_get_level_current(
330 struct acpi_video_device *device,
331 unsigned long long *level, int init);
332 static int acpi_video_get_next_level(struct acpi_video_device *device,
333 u32 level_current, u32 event);
334 static int acpi_video_switch_brightness(struct acpi_video_device *device,
335 int event);
336 static int acpi_video_device_get_state(struct acpi_video_device *device,
337 unsigned long long *state);
338 static int acpi_video_output_get(struct output_device *od);
339 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
340
341 /*backlight device sysfs support*/
342 static int acpi_video_get_brightness(struct backlight_device *bd)
343 {
344 unsigned long long cur_level;
345 int i;
346 struct acpi_video_device *vd =
347 (struct acpi_video_device *)bl_get_data(bd);
348
349 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, 0))
350 return -EINVAL;
351 for (i = 2; i < vd->brightness->count; i++) {
352 if (vd->brightness->levels[i] == cur_level)
353 /* The first two entries are special - see page 575
354 of the ACPI spec 3.0 */
355 return i-2;
356 }
357 return 0;
358 }
359
360 static int acpi_video_set_brightness(struct backlight_device *bd)
361 {
362 int request_level = bd->props.brightness + 2;
363 struct acpi_video_device *vd =
364 (struct acpi_video_device *)bl_get_data(bd);
365
366 return acpi_video_device_lcd_set_level(vd,
367 vd->brightness->levels[request_level]);
368 }
369
370 static struct backlight_ops acpi_backlight_ops = {
371 .get_brightness = acpi_video_get_brightness,
372 .update_status = acpi_video_set_brightness,
373 };
374
375 /*video output device sysfs support*/
376 static int acpi_video_output_get(struct output_device *od)
377 {
378 unsigned long long state;
379 struct acpi_video_device *vd =
380 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
381 acpi_video_device_get_state(vd, &state);
382 return (int)state;
383 }
384
385 static int acpi_video_output_set(struct output_device *od)
386 {
387 unsigned long state = od->request_state;
388 struct acpi_video_device *vd=
389 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
390 return acpi_video_device_set_state(vd, state);
391 }
392
393 static struct output_properties acpi_output_properties = {
394 .set_state = acpi_video_output_set,
395 .get_status = acpi_video_output_get,
396 };
397
398
399 /* thermal cooling device callbacks */
400 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
401 long *state)
402 {
403 struct acpi_device *device = cooling_dev->devdata;
404 struct acpi_video_device *video = acpi_driver_data(device);
405
406 *state = video->brightness->count - 3;
407 return 0;
408 }
409
410 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
411 long *state)
412 {
413 struct acpi_device *device = cooling_dev->devdata;
414 struct acpi_video_device *video = acpi_driver_data(device);
415 unsigned long long level;
416 int offset;
417
418 if (acpi_video_device_lcd_get_level_current(video, &level, 0))
419 return -EINVAL;
420 for (offset = 2; offset < video->brightness->count; offset++)
421 if (level == video->brightness->levels[offset]) {
422 *state = video->brightness->count - offset - 1;
423 return 0;
424 }
425
426 return -EINVAL;
427 }
428
429 static int
430 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
431 {
432 struct acpi_device *device = cooling_dev->devdata;
433 struct acpi_video_device *video = acpi_driver_data(device);
434 int level;
435
436 if ( state >= video->brightness->count - 2)
437 return -EINVAL;
438
439 state = video->brightness->count - state;
440 level = video->brightness->levels[state -1];
441 return acpi_video_device_lcd_set_level(video, level);
442 }
443
444 static struct thermal_cooling_device_ops video_cooling_ops = {
445 .get_max_state = video_get_max_state,
446 .get_cur_state = video_get_cur_state,
447 .set_cur_state = video_set_cur_state,
448 };
449
450 /* --------------------------------------------------------------------------
451 Video Management
452 -------------------------------------------------------------------------- */
453
454 /* device */
455
456 static int
457 acpi_video_device_query(struct acpi_video_device *device, unsigned long long *state)
458 {
459 int status;
460
461 status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
462
463 return status;
464 }
465
466 static int
467 acpi_video_device_get_state(struct acpi_video_device *device,
468 unsigned long long *state)
469 {
470 int status;
471
472 status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
473
474 return status;
475 }
476
477 static int
478 acpi_video_device_set_state(struct acpi_video_device *device, int state)
479 {
480 int status;
481 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
482 struct acpi_object_list args = { 1, &arg0 };
483 unsigned long long ret;
484
485
486 arg0.integer.value = state;
487 status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
488
489 return status;
490 }
491
492 static int
493 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
494 union acpi_object **levels)
495 {
496 int status;
497 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
498 union acpi_object *obj;
499
500
501 *levels = NULL;
502
503 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
504 if (!ACPI_SUCCESS(status))
505 return status;
506 obj = (union acpi_object *)buffer.pointer;
507 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
508 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
509 status = -EFAULT;
510 goto err;
511 }
512
513 *levels = obj;
514
515 return 0;
516
517 err:
518 kfree(buffer.pointer);
519
520 return status;
521 }
522
523 static int
524 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
525 {
526 int status;
527 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
528 struct acpi_object_list args = { 1, &arg0 };
529 int state;
530
531 arg0.integer.value = level;
532
533 status = acpi_evaluate_object(device->dev->handle, "_BCM",
534 &args, NULL);
535 if (ACPI_FAILURE(status)) {
536 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
537 return -EIO;
538 }
539
540 device->brightness->curr = level;
541 for (state = 2; state < device->brightness->count; state++)
542 if (level == device->brightness->levels[state]) {
543 if (device->backlight)
544 device->backlight->props.brightness = state - 2;
545 return 0;
546 }
547
548 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
549 return -EINVAL;
550 }
551
552 /*
553 * For some buggy _BQC methods, we need to add a constant value to
554 * the _BQC return value to get the actual current brightness level
555 */
556
557 static int bqc_offset_aml_bug_workaround;
558 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
559 {
560 bqc_offset_aml_bug_workaround = 9;
561 return 0;
562 }
563
564 static struct dmi_system_id video_dmi_table[] __initdata = {
565 /*
566 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
567 */
568 {
569 .callback = video_set_bqc_offset,
570 .ident = "Acer Aspire 5720",
571 .matches = {
572 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
573 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
574 },
575 },
576 {
577 .callback = video_set_bqc_offset,
578 .ident = "Acer Aspire 5710Z",
579 .matches = {
580 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
581 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
582 },
583 },
584 {
585 .callback = video_set_bqc_offset,
586 .ident = "eMachines E510",
587 .matches = {
588 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
589 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
590 },
591 },
592 {
593 .callback = video_set_bqc_offset,
594 .ident = "Acer Aspire 5315",
595 .matches = {
596 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
597 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
598 },
599 },
600 {
601 .callback = video_set_bqc_offset,
602 .ident = "Acer Aspire 7720",
603 .matches = {
604 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
605 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
606 },
607 },
608 {}
609 };
610
611 static int
612 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
613 unsigned long long *level, int init)
614 {
615 acpi_status status = AE_OK;
616 int i;
617
618 if (device->cap._BQC || device->cap._BCQ) {
619 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
620
621 status = acpi_evaluate_integer(device->dev->handle, buf,
622 NULL, level);
623 if (ACPI_SUCCESS(status)) {
624 if (device->brightness->flags._BQC_use_index) {
625 if (device->brightness->flags._BCL_reversed)
626 *level = device->brightness->count
627 - 3 - (*level);
628 *level = device->brightness->levels[*level + 2];
629
630 }
631 *level += bqc_offset_aml_bug_workaround;
632 for (i = 2; i < device->brightness->count; i++)
633 if (device->brightness->levels[i] == *level) {
634 device->brightness->curr = *level;
635 return 0;
636 }
637 if (!init) {
638 /*
639 * BQC returned an invalid level.
640 * Stop using it.
641 */
642 ACPI_WARNING((AE_INFO,
643 "%s returned an invalid level",
644 buf));
645 device->cap._BQC = device->cap._BCQ = 0;
646 }
647 } else {
648 /* Fixme:
649 * should we return an error or ignore this failure?
650 * dev->brightness->curr is a cached value which stores
651 * the correct current backlight level in most cases.
652 * ACPI video backlight still works w/ buggy _BQC.
653 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
654 */
655 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
656 device->cap._BQC = device->cap._BCQ = 0;
657 }
658 }
659
660 *level = device->brightness->curr;
661 return 0;
662 }
663
664 static int
665 acpi_video_device_EDID(struct acpi_video_device *device,
666 union acpi_object **edid, ssize_t length)
667 {
668 int status;
669 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
670 union acpi_object *obj;
671 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
672 struct acpi_object_list args = { 1, &arg0 };
673
674
675 *edid = NULL;
676
677 if (!device)
678 return -ENODEV;
679 if (length == 128)
680 arg0.integer.value = 1;
681 else if (length == 256)
682 arg0.integer.value = 2;
683 else
684 return -EINVAL;
685
686 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
687 if (ACPI_FAILURE(status))
688 return -ENODEV;
689
690 obj = buffer.pointer;
691
692 if (obj && obj->type == ACPI_TYPE_BUFFER)
693 *edid = obj;
694 else {
695 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
696 status = -EFAULT;
697 kfree(obj);
698 }
699
700 return status;
701 }
702
703 /* bus */
704
705 static int
706 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
707 {
708 int status;
709 unsigned long long tmp;
710 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
711 struct acpi_object_list args = { 1, &arg0 };
712
713
714 arg0.integer.value = option;
715
716 status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
717 if (ACPI_SUCCESS(status))
718 status = tmp ? (-EINVAL) : (AE_OK);
719
720 return status;
721 }
722
723 static int
724 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long long *id)
725 {
726 int status;
727
728 status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
729
730 return status;
731 }
732
733 static int
734 acpi_video_bus_POST_options(struct acpi_video_bus *video,
735 unsigned long long *options)
736 {
737 int status;
738
739 status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
740 *options &= 3;
741
742 return status;
743 }
744
745 /*
746 * Arg:
747 * video : video bus device pointer
748 * bios_flag :
749 * 0. The system BIOS should NOT automatically switch(toggle)
750 * the active display output.
751 * 1. The system BIOS should automatically switch (toggle) the
752 * active display output. No switch event.
753 * 2. The _DGS value should be locked.
754 * 3. The system BIOS should not automatically switch (toggle) the
755 * active display output, but instead generate the display switch
756 * event notify code.
757 * lcd_flag :
758 * 0. The system BIOS should automatically control the brightness level
759 * of the LCD when the power changes from AC to DC
760 * 1. The system BIOS should NOT automatically control the brightness
761 * level of the LCD when the power changes from AC to DC.
762 * Return Value:
763 * -1 wrong arg.
764 */
765
766 static int
767 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
768 {
769 u64 status = 0;
770 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
771 struct acpi_object_list args = { 1, &arg0 };
772
773
774 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
775 status = -1;
776 goto Failed;
777 }
778 arg0.integer.value = (lcd_flag << 2) | bios_flag;
779 video->dos_setting = arg0.integer.value;
780 acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
781
782 Failed:
783 return status;
784 }
785
786 /*
787 * Simple comparison function used to sort backlight levels.
788 */
789
790 static int
791 acpi_video_cmp_level(const void *a, const void *b)
792 {
793 return *(int *)a - *(int *)b;
794 }
795
796 /*
797 * Arg:
798 * device : video output device (LCD, CRT, ..)
799 *
800 * Return Value:
801 * Maximum brightness level
802 *
803 * Allocate and initialize device->brightness.
804 */
805
806 static int
807 acpi_video_init_brightness(struct acpi_video_device *device)
808 {
809 union acpi_object *obj = NULL;
810 int i, max_level = 0, count = 0, level_ac_battery = 0;
811 unsigned long long level, level_old;
812 union acpi_object *o;
813 struct acpi_video_device_brightness *br = NULL;
814 int result = -EINVAL;
815
816 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
817 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
818 "LCD brightness level\n"));
819 goto out;
820 }
821
822 if (obj->package.count < 2)
823 goto out;
824
825 br = kzalloc(sizeof(*br), GFP_KERNEL);
826 if (!br) {
827 printk(KERN_ERR "can't allocate memory\n");
828 result = -ENOMEM;
829 goto out;
830 }
831
832 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
833 GFP_KERNEL);
834 if (!br->levels) {
835 result = -ENOMEM;
836 goto out_free;
837 }
838
839 for (i = 0; i < obj->package.count; i++) {
840 o = (union acpi_object *)&obj->package.elements[i];
841 if (o->type != ACPI_TYPE_INTEGER) {
842 printk(KERN_ERR PREFIX "Invalid data\n");
843 continue;
844 }
845 br->levels[count] = (u32) o->integer.value;
846
847 if (br->levels[count] > max_level)
848 max_level = br->levels[count];
849 count++;
850 }
851
852 /*
853 * some buggy BIOS don't export the levels
854 * when machine is on AC/Battery in _BCL package.
855 * In this case, the first two elements in _BCL packages
856 * are also supported brightness levels that OS should take care of.
857 */
858 for (i = 2; i < count; i++) {
859 if (br->levels[i] == br->levels[0])
860 level_ac_battery++;
861 if (br->levels[i] == br->levels[1])
862 level_ac_battery++;
863 }
864
865 if (level_ac_battery < 2) {
866 level_ac_battery = 2 - level_ac_battery;
867 br->flags._BCL_no_ac_battery_levels = 1;
868 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
869 br->levels[i] = br->levels[i - level_ac_battery];
870 count += level_ac_battery;
871 } else if (level_ac_battery > 2)
872 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
873
874 /* Check if the _BCL package is in a reversed order */
875 if (max_level == br->levels[2]) {
876 br->flags._BCL_reversed = 1;
877 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
878 acpi_video_cmp_level, NULL);
879 } else if (max_level != br->levels[count - 1])
880 ACPI_ERROR((AE_INFO,
881 "Found unordered _BCL package\n"));
882
883 br->count = count;
884 device->brightness = br;
885
886 /* Check the input/output of _BQC/_BCL/_BCM */
887 if ((max_level < 100) && (max_level <= (count - 2)))
888 br->flags._BCL_use_index = 1;
889
890 /*
891 * _BCM is always consistent with _BCL,
892 * at least for all the laptops we have ever seen.
893 */
894 br->flags._BCM_use_index = br->flags._BCL_use_index;
895
896 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
897 br->curr = level = max_level;
898
899 if (!device->cap._BQC)
900 goto set_level;
901
902 result = acpi_video_device_lcd_get_level_current(device, &level_old, 1);
903 if (result)
904 goto out_free_levels;
905
906 /*
907 * Set the level to maximum and check if _BQC uses indexed value
908 */
909 result = acpi_video_device_lcd_set_level(device, max_level);
910 if (result)
911 goto out_free_levels;
912
913 result = acpi_video_device_lcd_get_level_current(device, &level, 0);
914 if (result)
915 goto out_free_levels;
916
917 br->flags._BQC_use_index = (level == max_level ? 0 : 1);
918
919 if (!br->flags._BQC_use_index) {
920 /*
921 * Set the backlight to the initial state.
922 * On some buggy laptops, _BQC returns an uninitialized value
923 * when invoked for the first time, i.e. level_old is invalid.
924 * set the backlight to max_level in this case
925 */
926 for (i = 2; i < br->count; i++)
927 if (level_old == br->levels[i])
928 level = level_old;
929 goto set_level;
930 }
931
932 if (br->flags._BCL_reversed)
933 level_old = (br->count - 1) - level_old;
934 level = br->levels[level_old];
935
936 set_level:
937 result = acpi_video_device_lcd_set_level(device, level);
938 if (result)
939 goto out_free_levels;
940
941 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
942 "found %d brightness levels\n", count - 2));
943 kfree(obj);
944 return result;
945
946 out_free_levels:
947 kfree(br->levels);
948 out_free:
949 kfree(br);
950 out:
951 device->brightness = NULL;
952 kfree(obj);
953 return result;
954 }
955
956 /*
957 * Arg:
958 * device : video output device (LCD, CRT, ..)
959 *
960 * Return Value:
961 * None
962 *
963 * Find out all required AML methods defined under the output
964 * device.
965 */
966
967 static void acpi_video_device_find_cap(struct acpi_video_device *device)
968 {
969 acpi_handle h_dummy1;
970
971 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
972 device->cap._ADR = 1;
973 }
974 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
975 device->cap._BCL = 1;
976 }
977 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
978 device->cap._BCM = 1;
979 }
980 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
981 device->cap._BQC = 1;
982 else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
983 &h_dummy1))) {
984 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
985 device->cap._BCQ = 1;
986 }
987
988 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
989 device->cap._DDC = 1;
990 }
991 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
992 device->cap._DCS = 1;
993 }
994 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
995 device->cap._DGS = 1;
996 }
997 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
998 device->cap._DSS = 1;
999 }
1000
1001 if (acpi_video_backlight_support()) {
1002 struct backlight_properties props;
1003 int result;
1004 static int count = 0;
1005 char *name;
1006
1007 result = acpi_video_init_brightness(device);
1008 if (result)
1009 return;
1010 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
1011 if (!name)
1012 return;
1013
1014 sprintf(name, "acpi_video%d", count++);
1015 memset(&props, 0, sizeof(struct backlight_properties));
1016 props.max_brightness = device->brightness->count - 3;
1017 device->backlight = backlight_device_register(name, NULL, device,
1018 &acpi_backlight_ops,
1019 &props);
1020 kfree(name);
1021 if (IS_ERR(device->backlight))
1022 return;
1023
1024 result = sysfs_create_link(&device->backlight->dev.kobj,
1025 &device->dev->dev.kobj, "device");
1026 if (result)
1027 printk(KERN_ERR PREFIX "Create sysfs link\n");
1028
1029 device->cooling_dev = thermal_cooling_device_register("LCD",
1030 device->dev, &video_cooling_ops);
1031 if (IS_ERR(device->cooling_dev)) {
1032 /*
1033 * Set cooling_dev to NULL so we don't crash trying to
1034 * free it.
1035 * Also, why the hell we are returning early and
1036 * not attempt to register video output if cooling
1037 * device registration failed?
1038 * -- dtor
1039 */
1040 device->cooling_dev = NULL;
1041 return;
1042 }
1043
1044 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1045 device->cooling_dev->id);
1046 result = sysfs_create_link(&device->dev->dev.kobj,
1047 &device->cooling_dev->device.kobj,
1048 "thermal_cooling");
1049 if (result)
1050 printk(KERN_ERR PREFIX "Create sysfs link\n");
1051 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1052 &device->dev->dev.kobj, "device");
1053 if (result)
1054 printk(KERN_ERR PREFIX "Create sysfs link\n");
1055
1056 }
1057
1058 if (acpi_video_display_switch_support()) {
1059
1060 if (device->cap._DCS && device->cap._DSS) {
1061 static int count;
1062 char *name;
1063 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
1064 if (!name)
1065 return;
1066 sprintf(name, "acpi_video%d", count++);
1067 device->output_dev = video_output_register(name,
1068 NULL, device, &acpi_output_properties);
1069 kfree(name);
1070 }
1071 }
1072 }
1073
1074 /*
1075 * Arg:
1076 * device : video output device (VGA)
1077 *
1078 * Return Value:
1079 * None
1080 *
1081 * Find out all required AML methods defined under the video bus device.
1082 */
1083
1084 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1085 {
1086 acpi_handle h_dummy1;
1087
1088 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
1089 video->cap._DOS = 1;
1090 }
1091 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
1092 video->cap._DOD = 1;
1093 }
1094 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
1095 video->cap._ROM = 1;
1096 }
1097 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
1098 video->cap._GPD = 1;
1099 }
1100 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
1101 video->cap._SPD = 1;
1102 }
1103 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
1104 video->cap._VPO = 1;
1105 }
1106 }
1107
1108 /*
1109 * Check whether the video bus device has required AML method to
1110 * support the desired features
1111 */
1112
1113 static int acpi_video_bus_check(struct acpi_video_bus *video)
1114 {
1115 acpi_status status = -ENOENT;
1116 struct pci_dev *dev;
1117
1118 if (!video)
1119 return -EINVAL;
1120
1121 dev = acpi_get_pci_dev(video->device->handle);
1122 if (!dev)
1123 return -ENODEV;
1124 pci_dev_put(dev);
1125
1126 /* Since there is no HID, CID and so on for VGA driver, we have
1127 * to check well known required nodes.
1128 */
1129
1130 /* Does this device support video switching? */
1131 if (video->cap._DOS || video->cap._DOD) {
1132 if (!video->cap._DOS) {
1133 printk(KERN_WARNING FW_BUG
1134 "ACPI(%s) defines _DOD but not _DOS\n",
1135 acpi_device_bid(video->device));
1136 }
1137 video->flags.multihead = 1;
1138 status = 0;
1139 }
1140
1141 /* Does this device support retrieving a video ROM? */
1142 if (video->cap._ROM) {
1143 video->flags.rom = 1;
1144 status = 0;
1145 }
1146
1147 /* Does this device support configuring which video device to POST? */
1148 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1149 video->flags.post = 1;
1150 status = 0;
1151 }
1152
1153 return status;
1154 }
1155
1156 /* --------------------------------------------------------------------------
1157 FS Interface (/proc)
1158 -------------------------------------------------------------------------- */
1159
1160 static struct proc_dir_entry *acpi_video_dir;
1161
1162 /* video devices */
1163
1164 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
1165 {
1166 struct acpi_video_device *dev = seq->private;
1167
1168
1169 if (!dev)
1170 goto end;
1171
1172 seq_printf(seq, "device_id: 0x%04x\n", (u32) dev->device_id);
1173 seq_printf(seq, "type: ");
1174 if (dev->flags.crt)
1175 seq_printf(seq, "CRT\n");
1176 else if (dev->flags.lcd)
1177 seq_printf(seq, "LCD\n");
1178 else if (dev->flags.tvout)
1179 seq_printf(seq, "TVOUT\n");
1180 else if (dev->flags.dvi)
1181 seq_printf(seq, "DVI\n");
1182 else
1183 seq_printf(seq, "UNKNOWN\n");
1184
1185 seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
1186
1187 end:
1188 return 0;
1189 }
1190
1191 static int
1192 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
1193 {
1194 return single_open(file, acpi_video_device_info_seq_show,
1195 PDE(inode)->data);
1196 }
1197
1198 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
1199 {
1200 int status;
1201 struct acpi_video_device *dev = seq->private;
1202 unsigned long long state;
1203
1204
1205 if (!dev)
1206 goto end;
1207
1208 status = acpi_video_device_get_state(dev, &state);
1209 seq_printf(seq, "state: ");
1210 if (ACPI_SUCCESS(status))
1211 seq_printf(seq, "0x%02llx\n", state);
1212 else
1213 seq_printf(seq, "<not supported>\n");
1214
1215 status = acpi_video_device_query(dev, &state);
1216 seq_printf(seq, "query: ");
1217 if (ACPI_SUCCESS(status))
1218 seq_printf(seq, "0x%02llx\n", state);
1219 else
1220 seq_printf(seq, "<not supported>\n");
1221
1222 end:
1223 return 0;
1224 }
1225
1226 static int
1227 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
1228 {
1229 return single_open(file, acpi_video_device_state_seq_show,
1230 PDE(inode)->data);
1231 }
1232
1233 static ssize_t
1234 acpi_video_device_write_state(struct file *file,
1235 const char __user * buffer,
1236 size_t count, loff_t * data)
1237 {
1238 int status;
1239 struct seq_file *m = file->private_data;
1240 struct acpi_video_device *dev = m->private;
1241 char str[12] = { 0 };
1242 u32 state = 0;
1243
1244
1245 if (!dev || count >= sizeof(str))
1246 return -EINVAL;
1247
1248 if (copy_from_user(str, buffer, count))
1249 return -EFAULT;
1250
1251 str[count] = 0;
1252 state = simple_strtoul(str, NULL, 0);
1253 state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
1254
1255 status = acpi_video_device_set_state(dev, state);
1256
1257 if (status)
1258 return -EFAULT;
1259
1260 return count;
1261 }
1262
1263 static int
1264 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
1265 {
1266 struct acpi_video_device *dev = seq->private;
1267 int i;
1268
1269
1270 if (!dev || !dev->brightness) {
1271 seq_printf(seq, "<not supported>\n");
1272 return 0;
1273 }
1274
1275 seq_printf(seq, "levels: ");
1276 for (i = 2; i < dev->brightness->count; i++)
1277 seq_printf(seq, " %d", dev->brightness->levels[i]);
1278 seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
1279
1280 return 0;
1281 }
1282
1283 static int
1284 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1285 {
1286 return single_open(file, acpi_video_device_brightness_seq_show,
1287 PDE(inode)->data);
1288 }
1289
1290 static ssize_t
1291 acpi_video_device_write_brightness(struct file *file,
1292 const char __user * buffer,
1293 size_t count, loff_t * data)
1294 {
1295 struct seq_file *m = file->private_data;
1296 struct acpi_video_device *dev = m->private;
1297 char str[5] = { 0 };
1298 unsigned int level = 0;
1299 int i;
1300
1301
1302 if (!dev || !dev->brightness || count >= sizeof(str))
1303 return -EINVAL;
1304
1305 if (copy_from_user(str, buffer, count))
1306 return -EFAULT;
1307
1308 str[count] = 0;
1309 level = simple_strtoul(str, NULL, 0);
1310
1311 if (level > 100)
1312 return -EFAULT;
1313
1314 /* validate through the list of available levels */
1315 for (i = 2; i < dev->brightness->count; i++)
1316 if (level == dev->brightness->levels[i]) {
1317 if (!acpi_video_device_lcd_set_level(dev, level))
1318 return count;
1319 break;
1320 }
1321
1322 return -EINVAL;
1323 }
1324
1325 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1326 {
1327 struct acpi_video_device *dev = seq->private;
1328 int status;
1329 int i;
1330 union acpi_object *edid = NULL;
1331
1332
1333 if (!dev)
1334 goto out;
1335
1336 status = acpi_video_device_EDID(dev, &edid, 128);
1337 if (ACPI_FAILURE(status)) {
1338 status = acpi_video_device_EDID(dev, &edid, 256);
1339 }
1340
1341 if (ACPI_FAILURE(status)) {
1342 goto out;
1343 }
1344
1345 if (edid && edid->type == ACPI_TYPE_BUFFER) {
1346 for (i = 0; i < edid->buffer.length; i++)
1347 seq_putc(seq, edid->buffer.pointer[i]);
1348 }
1349
1350 out:
1351 if (!edid)
1352 seq_printf(seq, "<not supported>\n");
1353 else
1354 kfree(edid);
1355
1356 return 0;
1357 }
1358
1359 static int
1360 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1361 {
1362 return single_open(file, acpi_video_device_EDID_seq_show,
1363 PDE(inode)->data);
1364 }
1365
1366 static int acpi_video_device_add_fs(struct acpi_device *device)
1367 {
1368 struct proc_dir_entry *entry, *device_dir;
1369 struct acpi_video_device *vid_dev;
1370
1371 vid_dev = acpi_driver_data(device);
1372 if (!vid_dev)
1373 return -ENODEV;
1374
1375 device_dir = proc_mkdir(acpi_device_bid(device),
1376 vid_dev->video->dir);
1377 if (!device_dir)
1378 return -ENOMEM;
1379
1380 /* 'info' [R] */
1381 entry = proc_create_data("info", S_IRUGO, device_dir,
1382 &acpi_video_device_info_fops, acpi_driver_data(device));
1383 if (!entry)
1384 goto err_remove_dir;
1385
1386 /* 'state' [R/W] */
1387 entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1388 device_dir,
1389 &acpi_video_device_state_fops,
1390 acpi_driver_data(device));
1391 if (!entry)
1392 goto err_remove_info;
1393
1394 /* 'brightness' [R/W] */
1395 entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1396 device_dir,
1397 &acpi_video_device_brightness_fops,
1398 acpi_driver_data(device));
1399 if (!entry)
1400 goto err_remove_state;
1401
1402 /* 'EDID' [R] */
1403 entry = proc_create_data("EDID", S_IRUGO, device_dir,
1404 &acpi_video_device_EDID_fops,
1405 acpi_driver_data(device));
1406 if (!entry)
1407 goto err_remove_brightness;
1408
1409 acpi_device_dir(device) = device_dir;
1410
1411 return 0;
1412
1413 err_remove_brightness:
1414 remove_proc_entry("brightness", device_dir);
1415 err_remove_state:
1416 remove_proc_entry("state", device_dir);
1417 err_remove_info:
1418 remove_proc_entry("info", device_dir);
1419 err_remove_dir:
1420 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1421 return -ENOMEM;
1422 }
1423
1424 static int acpi_video_device_remove_fs(struct acpi_device *device)
1425 {
1426 struct acpi_video_device *vid_dev;
1427 struct proc_dir_entry *device_dir;
1428
1429 vid_dev = acpi_driver_data(device);
1430 if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1431 return -ENODEV;
1432
1433 device_dir = acpi_device_dir(device);
1434 if (device_dir) {
1435 remove_proc_entry("info", device_dir);
1436 remove_proc_entry("state", device_dir);
1437 remove_proc_entry("brightness", device_dir);
1438 remove_proc_entry("EDID", device_dir);
1439 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1440 acpi_device_dir(device) = NULL;
1441 }
1442
1443 return 0;
1444 }
1445
1446 /* video bus */
1447 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1448 {
1449 struct acpi_video_bus *video = seq->private;
1450
1451
1452 if (!video)
1453 goto end;
1454
1455 seq_printf(seq, "Switching heads: %s\n",
1456 video->flags.multihead ? "yes" : "no");
1457 seq_printf(seq, "Video ROM: %s\n",
1458 video->flags.rom ? "yes" : "no");
1459 seq_printf(seq, "Device to be POSTed on boot: %s\n",
1460 video->flags.post ? "yes" : "no");
1461
1462 end:
1463 return 0;
1464 }
1465
1466 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1467 {
1468 return single_open(file, acpi_video_bus_info_seq_show,
1469 PDE(inode)->data);
1470 }
1471
1472 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1473 {
1474 struct acpi_video_bus *video = seq->private;
1475
1476
1477 if (!video)
1478 goto end;
1479
1480 printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1481 seq_printf(seq, "<TODO>\n");
1482
1483 end:
1484 return 0;
1485 }
1486
1487 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1488 {
1489 return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1490 }
1491
1492 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1493 {
1494 struct acpi_video_bus *video = seq->private;
1495 unsigned long long options;
1496 int status;
1497
1498
1499 if (!video)
1500 goto end;
1501
1502 status = acpi_video_bus_POST_options(video, &options);
1503 if (ACPI_SUCCESS(status)) {
1504 if (!(options & 1)) {
1505 printk(KERN_WARNING PREFIX
1506 "The motherboard VGA device is not listed as a possible POST device.\n");
1507 printk(KERN_WARNING PREFIX
1508 "This indicates a BIOS bug. Please contact the manufacturer.\n");
1509 }
1510 printk(KERN_WARNING "%llx\n", options);
1511 seq_printf(seq, "can POST: <integrated video>");
1512 if (options & 2)
1513 seq_printf(seq, " <PCI video>");
1514 if (options & 4)
1515 seq_printf(seq, " <AGP video>");
1516 seq_putc(seq, '\n');
1517 } else
1518 seq_printf(seq, "<not supported>\n");
1519 end:
1520 return 0;
1521 }
1522
1523 static int
1524 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1525 {
1526 return single_open(file, acpi_video_bus_POST_info_seq_show,
1527 PDE(inode)->data);
1528 }
1529
1530 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1531 {
1532 struct acpi_video_bus *video = seq->private;
1533 int status;
1534 unsigned long long id;
1535
1536
1537 if (!video)
1538 goto end;
1539
1540 status = acpi_video_bus_get_POST(video, &id);
1541 if (!ACPI_SUCCESS(status)) {
1542 seq_printf(seq, "<not supported>\n");
1543 goto end;
1544 }
1545 seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1546
1547 end:
1548 return 0;
1549 }
1550
1551 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1552 {
1553 struct acpi_video_bus *video = seq->private;
1554
1555
1556 seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1557
1558 return 0;
1559 }
1560
1561 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1562 {
1563 return single_open(file, acpi_video_bus_POST_seq_show,
1564 PDE(inode)->data);
1565 }
1566
1567 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1568 {
1569 return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1570 }
1571
1572 static ssize_t
1573 acpi_video_bus_write_POST(struct file *file,
1574 const char __user * buffer,
1575 size_t count, loff_t * data)
1576 {
1577 int status;
1578 struct seq_file *m = file->private_data;
1579 struct acpi_video_bus *video = m->private;
1580 char str[12] = { 0 };
1581 unsigned long long opt, options;
1582
1583
1584 if (!video || count >= sizeof(str))
1585 return -EINVAL;
1586
1587 status = acpi_video_bus_POST_options(video, &options);
1588 if (!ACPI_SUCCESS(status))
1589 return -EINVAL;
1590
1591 if (copy_from_user(str, buffer, count))
1592 return -EFAULT;
1593
1594 str[count] = 0;
1595 opt = strtoul(str, NULL, 0);
1596 if (opt > 3)
1597 return -EFAULT;
1598
1599 /* just in case an OEM 'forgot' the motherboard... */
1600 options |= 1;
1601
1602 if (options & (1ul << opt)) {
1603 status = acpi_video_bus_set_POST(video, opt);
1604 if (!ACPI_SUCCESS(status))
1605 return -EFAULT;
1606
1607 }
1608
1609 return count;
1610 }
1611
1612 static ssize_t
1613 acpi_video_bus_write_DOS(struct file *file,
1614 const char __user * buffer,
1615 size_t count, loff_t * data)
1616 {
1617 int status;
1618 struct seq_file *m = file->private_data;
1619 struct acpi_video_bus *video = m->private;
1620 char str[12] = { 0 };
1621 unsigned long opt;
1622
1623
1624 if (!video || count >= sizeof(str))
1625 return -EINVAL;
1626
1627 if (copy_from_user(str, buffer, count))
1628 return -EFAULT;
1629
1630 str[count] = 0;
1631 opt = strtoul(str, NULL, 0);
1632 if (opt > 7)
1633 return -EFAULT;
1634
1635 status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1636
1637 if (!ACPI_SUCCESS(status))
1638 return -EFAULT;
1639
1640 return count;
1641 }
1642
1643 static int acpi_video_bus_add_fs(struct acpi_device *device)
1644 {
1645 struct acpi_video_bus *video = acpi_driver_data(device);
1646 struct proc_dir_entry *device_dir;
1647 struct proc_dir_entry *entry;
1648
1649 device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1650 if (!device_dir)
1651 return -ENOMEM;
1652
1653 /* 'info' [R] */
1654 entry = proc_create_data("info", S_IRUGO, device_dir,
1655 &acpi_video_bus_info_fops,
1656 acpi_driver_data(device));
1657 if (!entry)
1658 goto err_remove_dir;
1659
1660 /* 'ROM' [R] */
1661 entry = proc_create_data("ROM", S_IRUGO, device_dir,
1662 &acpi_video_bus_ROM_fops,
1663 acpi_driver_data(device));
1664 if (!entry)
1665 goto err_remove_info;
1666
1667 /* 'POST_info' [R] */
1668 entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1669 &acpi_video_bus_POST_info_fops,
1670 acpi_driver_data(device));
1671 if (!entry)
1672 goto err_remove_rom;
1673
1674 /* 'POST' [R/W] */
1675 entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1676 device_dir,
1677 &acpi_video_bus_POST_fops,
1678 acpi_driver_data(device));
1679 if (!entry)
1680 goto err_remove_post_info;
1681
1682 /* 'DOS' [R/W] */
1683 entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1684 device_dir,
1685 &acpi_video_bus_DOS_fops,
1686 acpi_driver_data(device));
1687 if (!entry)
1688 goto err_remove_post;
1689
1690 video->dir = acpi_device_dir(device) = device_dir;
1691 return 0;
1692
1693 err_remove_post:
1694 remove_proc_entry("POST", device_dir);
1695 err_remove_post_info:
1696 remove_proc_entry("POST_info", device_dir);
1697 err_remove_rom:
1698 remove_proc_entry("ROM", device_dir);
1699 err_remove_info:
1700 remove_proc_entry("info", device_dir);
1701 err_remove_dir:
1702 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1703 return -ENOMEM;
1704 }
1705
1706 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1707 {
1708 struct proc_dir_entry *device_dir = acpi_device_dir(device);
1709
1710 if (device_dir) {
1711 remove_proc_entry("info", device_dir);
1712 remove_proc_entry("ROM", device_dir);
1713 remove_proc_entry("POST_info", device_dir);
1714 remove_proc_entry("POST", device_dir);
1715 remove_proc_entry("DOS", device_dir);
1716 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1717 acpi_device_dir(device) = NULL;
1718 }
1719
1720 return 0;
1721 }
1722
1723 /* --------------------------------------------------------------------------
1724 Driver Interface
1725 -------------------------------------------------------------------------- */
1726
1727 /* device interface */
1728 static struct acpi_video_device_attrib*
1729 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1730 {
1731 struct acpi_video_enumerated_device *ids;
1732 int i;
1733
1734 for (i = 0; i < video->attached_count; i++) {
1735 ids = &video->attached_array[i];
1736 if ((ids->value.int_val & 0xffff) == device_id)
1737 return &ids->value.attrib;
1738 }
1739
1740 return NULL;
1741 }
1742
1743 static int
1744 acpi_video_bus_get_one_device(struct acpi_device *device,
1745 struct acpi_video_bus *video)
1746 {
1747 unsigned long long device_id;
1748 int status;
1749 struct acpi_video_device *data;
1750 struct acpi_video_device_attrib* attribute;
1751
1752 if (!device || !video)
1753 return -EINVAL;
1754
1755 status =
1756 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1757 if (ACPI_SUCCESS(status)) {
1758
1759 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1760 if (!data)
1761 return -ENOMEM;
1762
1763 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1764 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1765 device->driver_data = data;
1766
1767 data->device_id = device_id;
1768 data->video = video;
1769 data->dev = device;
1770
1771 attribute = acpi_video_get_device_attr(video, device_id);
1772
1773 if((attribute != NULL) && attribute->device_id_scheme) {
1774 switch (attribute->display_type) {
1775 case ACPI_VIDEO_DISPLAY_CRT:
1776 data->flags.crt = 1;
1777 break;
1778 case ACPI_VIDEO_DISPLAY_TV:
1779 data->flags.tvout = 1;
1780 break;
1781 case ACPI_VIDEO_DISPLAY_DVI:
1782 data->flags.dvi = 1;
1783 break;
1784 case ACPI_VIDEO_DISPLAY_LCD:
1785 data->flags.lcd = 1;
1786 break;
1787 default:
1788 data->flags.unknown = 1;
1789 break;
1790 }
1791 if(attribute->bios_can_detect)
1792 data->flags.bios = 1;
1793 } else
1794 data->flags.unknown = 1;
1795
1796 acpi_video_device_bind(video, data);
1797 acpi_video_device_find_cap(data);
1798
1799 status = acpi_install_notify_handler(device->handle,
1800 ACPI_DEVICE_NOTIFY,
1801 acpi_video_device_notify,
1802 data);
1803 if (ACPI_FAILURE(status)) {
1804 printk(KERN_ERR PREFIX
1805 "Error installing notify handler\n");
1806 if(data->brightness)
1807 kfree(data->brightness->levels);
1808 kfree(data->brightness);
1809 kfree(data);
1810 return -ENODEV;
1811 }
1812
1813 mutex_lock(&video->device_list_lock);
1814 list_add_tail(&data->entry, &video->video_device_list);
1815 mutex_unlock(&video->device_list_lock);
1816
1817 acpi_video_device_add_fs(device);
1818
1819 return 0;
1820 }
1821
1822 return -ENOENT;
1823 }
1824
1825 /*
1826 * Arg:
1827 * video : video bus device
1828 *
1829 * Return:
1830 * none
1831 *
1832 * Enumerate the video device list of the video bus,
1833 * bind the ids with the corresponding video devices
1834 * under the video bus.
1835 */
1836
1837 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1838 {
1839 struct acpi_video_device *dev;
1840
1841 mutex_lock(&video->device_list_lock);
1842
1843 list_for_each_entry(dev, &video->video_device_list, entry)
1844 acpi_video_device_bind(video, dev);
1845
1846 mutex_unlock(&video->device_list_lock);
1847 }
1848
1849 /*
1850 * Arg:
1851 * video : video bus device
1852 * device : video output device under the video
1853 * bus
1854 *
1855 * Return:
1856 * none
1857 *
1858 * Bind the ids with the corresponding video devices
1859 * under the video bus.
1860 */
1861
1862 static void
1863 acpi_video_device_bind(struct acpi_video_bus *video,
1864 struct acpi_video_device *device)
1865 {
1866 struct acpi_video_enumerated_device *ids;
1867 int i;
1868
1869 for (i = 0; i < video->attached_count; i++) {
1870 ids = &video->attached_array[i];
1871 if (device->device_id == (ids->value.int_val & 0xffff)) {
1872 ids->bind_info = device;
1873 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1874 }
1875 }
1876 }
1877
1878 /*
1879 * Arg:
1880 * video : video bus device
1881 *
1882 * Return:
1883 * < 0 : error
1884 *
1885 * Call _DOD to enumerate all devices attached to display adapter
1886 *
1887 */
1888
1889 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1890 {
1891 int status;
1892 int count;
1893 int i;
1894 struct acpi_video_enumerated_device *active_list;
1895 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1896 union acpi_object *dod = NULL;
1897 union acpi_object *obj;
1898
1899 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1900 if (!ACPI_SUCCESS(status)) {
1901 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1902 return status;
1903 }
1904
1905 dod = buffer.pointer;
1906 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1907 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1908 status = -EFAULT;
1909 goto out;
1910 }
1911
1912 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1913 dod->package.count));
1914
1915 active_list = kcalloc(1 + dod->package.count,
1916 sizeof(struct acpi_video_enumerated_device),
1917 GFP_KERNEL);
1918 if (!active_list) {
1919 status = -ENOMEM;
1920 goto out;
1921 }
1922
1923 count = 0;
1924 for (i = 0; i < dod->package.count; i++) {
1925 obj = &dod->package.elements[i];
1926
1927 if (obj->type != ACPI_TYPE_INTEGER) {
1928 printk(KERN_ERR PREFIX
1929 "Invalid _DOD data in element %d\n", i);
1930 continue;
1931 }
1932
1933 active_list[count].value.int_val = obj->integer.value;
1934 active_list[count].bind_info = NULL;
1935 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1936 (int)obj->integer.value));
1937 count++;
1938 }
1939
1940 kfree(video->attached_array);
1941
1942 video->attached_array = active_list;
1943 video->attached_count = count;
1944
1945 out:
1946 kfree(buffer.pointer);
1947 return status;
1948 }
1949
1950 static int
1951 acpi_video_get_next_level(struct acpi_video_device *device,
1952 u32 level_current, u32 event)
1953 {
1954 int min, max, min_above, max_below, i, l, delta = 255;
1955 max = max_below = 0;
1956 min = min_above = 255;
1957 /* Find closest level to level_current */
1958 for (i = 2; i < device->brightness->count; i++) {
1959 l = device->brightness->levels[i];
1960 if (abs(l - level_current) < abs(delta)) {
1961 delta = l - level_current;
1962 if (!delta)
1963 break;
1964 }
1965 }
1966 /* Ajust level_current to closest available level */
1967 level_current += delta;
1968 for (i = 2; i < device->brightness->count; i++) {
1969 l = device->brightness->levels[i];
1970 if (l < min)
1971 min = l;
1972 if (l > max)
1973 max = l;
1974 if (l < min_above && l > level_current)
1975 min_above = l;
1976 if (l > max_below && l < level_current)
1977 max_below = l;
1978 }
1979
1980 switch (event) {
1981 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1982 return (level_current < max) ? min_above : min;
1983 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1984 return (level_current < max) ? min_above : max;
1985 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1986 return (level_current > min) ? max_below : min;
1987 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1988 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1989 return 0;
1990 default:
1991 return level_current;
1992 }
1993 }
1994
1995 static int
1996 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1997 {
1998 unsigned long long level_current, level_next;
1999 int result = -EINVAL;
2000
2001 /* no warning message if acpi_backlight=vendor is used */
2002 if (!acpi_video_backlight_support())
2003 return 0;
2004
2005 if (!device->brightness)
2006 goto out;
2007
2008 result = acpi_video_device_lcd_get_level_current(device,
2009 &level_current, 0);
2010 if (result)
2011 goto out;
2012
2013 level_next = acpi_video_get_next_level(device, level_current, event);
2014
2015 result = acpi_video_device_lcd_set_level(device, level_next);
2016
2017 if (!result)
2018 backlight_force_update(device->backlight,
2019 BACKLIGHT_UPDATE_HOTKEY);
2020
2021 out:
2022 if (result)
2023 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
2024
2025 return result;
2026 }
2027
2028 static int
2029 acpi_video_bus_get_devices(struct acpi_video_bus *video,
2030 struct acpi_device *device)
2031 {
2032 int status = 0;
2033 struct acpi_device *dev;
2034
2035 acpi_video_device_enumerate(video);
2036
2037 list_for_each_entry(dev, &device->children, node) {
2038
2039 status = acpi_video_bus_get_one_device(dev, video);
2040 if (ACPI_FAILURE(status)) {
2041 printk(KERN_WARNING PREFIX
2042 "Cant attach device");
2043 continue;
2044 }
2045 }
2046 return status;
2047 }
2048
2049 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
2050 {
2051 acpi_status status;
2052 struct acpi_video_bus *video;
2053
2054
2055 if (!device || !device->video)
2056 return -ENOENT;
2057
2058 video = device->video;
2059
2060 acpi_video_device_remove_fs(device->dev);
2061
2062 status = acpi_remove_notify_handler(device->dev->handle,
2063 ACPI_DEVICE_NOTIFY,
2064 acpi_video_device_notify);
2065 if (device->backlight) {
2066 sysfs_remove_link(&device->backlight->dev.kobj, "device");
2067 backlight_device_unregister(device->backlight);
2068 device->backlight = NULL;
2069 }
2070 if (device->cooling_dev) {
2071 sysfs_remove_link(&device->dev->dev.kobj,
2072 "thermal_cooling");
2073 sysfs_remove_link(&device->cooling_dev->device.kobj,
2074 "device");
2075 thermal_cooling_device_unregister(device->cooling_dev);
2076 device->cooling_dev = NULL;
2077 }
2078 video_output_unregister(device->output_dev);
2079
2080 return 0;
2081 }
2082
2083 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2084 {
2085 int status;
2086 struct acpi_video_device *dev, *next;
2087
2088 mutex_lock(&video->device_list_lock);
2089
2090 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2091
2092 status = acpi_video_bus_put_one_device(dev);
2093 if (ACPI_FAILURE(status))
2094 printk(KERN_WARNING PREFIX
2095 "hhuuhhuu bug in acpi video driver.\n");
2096
2097 if (dev->brightness) {
2098 kfree(dev->brightness->levels);
2099 kfree(dev->brightness);
2100 }
2101 list_del(&dev->entry);
2102 kfree(dev);
2103 }
2104
2105 mutex_unlock(&video->device_list_lock);
2106
2107 return 0;
2108 }
2109
2110 /* acpi_video interface */
2111
2112 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
2113 {
2114 return acpi_video_bus_DOS(video, 0, 0);
2115 }
2116
2117 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
2118 {
2119 return acpi_video_bus_DOS(video, 0, 1);
2120 }
2121
2122 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
2123 {
2124 struct acpi_video_bus *video = acpi_driver_data(device);
2125 struct input_dev *input;
2126 int keycode;
2127
2128 if (!video)
2129 return;
2130
2131 input = video->input;
2132
2133 switch (event) {
2134 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
2135 * most likely via hotkey. */
2136 acpi_bus_generate_proc_event(device, event, 0);
2137 keycode = KEY_SWITCHVIDEOMODE;
2138 break;
2139
2140 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
2141 * connector. */
2142 acpi_video_device_enumerate(video);
2143 acpi_video_device_rebind(video);
2144 acpi_bus_generate_proc_event(device, event, 0);
2145 keycode = KEY_SWITCHVIDEOMODE;
2146 break;
2147
2148 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
2149 acpi_bus_generate_proc_event(device, event, 0);
2150 keycode = KEY_SWITCHVIDEOMODE;
2151 break;
2152 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
2153 acpi_bus_generate_proc_event(device, event, 0);
2154 keycode = KEY_VIDEO_NEXT;
2155 break;
2156 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
2157 acpi_bus_generate_proc_event(device, event, 0);
2158 keycode = KEY_VIDEO_PREV;
2159 break;
2160
2161 default:
2162 keycode = KEY_UNKNOWN;
2163 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2164 "Unsupported event [0x%x]\n", event));
2165 break;
2166 }
2167
2168 acpi_notifier_call_chain(device, event, 0);
2169 input_report_key(input, keycode, 1);
2170 input_sync(input);
2171 input_report_key(input, keycode, 0);
2172 input_sync(input);
2173
2174 return;
2175 }
2176
2177 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
2178 {
2179 struct acpi_video_device *video_device = data;
2180 struct acpi_device *device = NULL;
2181 struct acpi_video_bus *bus;
2182 struct input_dev *input;
2183 int keycode;
2184
2185 if (!video_device)
2186 return;
2187
2188 device = video_device->dev;
2189 bus = video_device->video;
2190 input = bus->input;
2191
2192 switch (event) {
2193 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
2194 if (brightness_switch_enabled)
2195 acpi_video_switch_brightness(video_device, event);
2196 acpi_bus_generate_proc_event(device, event, 0);
2197 keycode = KEY_BRIGHTNESS_CYCLE;
2198 break;
2199 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
2200 if (brightness_switch_enabled)
2201 acpi_video_switch_brightness(video_device, event);
2202 acpi_bus_generate_proc_event(device, event, 0);
2203 keycode = KEY_BRIGHTNESSUP;
2204 break;
2205 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
2206 if (brightness_switch_enabled)
2207 acpi_video_switch_brightness(video_device, event);
2208 acpi_bus_generate_proc_event(device, event, 0);
2209 keycode = KEY_BRIGHTNESSDOWN;
2210 break;
2211 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
2212 if (brightness_switch_enabled)
2213 acpi_video_switch_brightness(video_device, event);
2214 acpi_bus_generate_proc_event(device, event, 0);
2215 keycode = KEY_BRIGHTNESS_ZERO;
2216 break;
2217 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
2218 if (brightness_switch_enabled)
2219 acpi_video_switch_brightness(video_device, event);
2220 acpi_bus_generate_proc_event(device, event, 0);
2221 keycode = KEY_DISPLAY_OFF;
2222 break;
2223 default:
2224 keycode = KEY_UNKNOWN;
2225 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2226 "Unsupported event [0x%x]\n", event));
2227 break;
2228 }
2229
2230 acpi_notifier_call_chain(device, event, 0);
2231 input_report_key(input, keycode, 1);
2232 input_sync(input);
2233 input_report_key(input, keycode, 0);
2234 input_sync(input);
2235
2236 return;
2237 }
2238
2239 static int instance;
2240 static int acpi_video_resume(struct acpi_device *device)
2241 {
2242 struct acpi_video_bus *video;
2243 struct acpi_video_device *video_device;
2244 int i;
2245
2246 if (!device || !acpi_driver_data(device))
2247 return -EINVAL;
2248
2249 video = acpi_driver_data(device);
2250
2251 for (i = 0; i < video->attached_count; i++) {
2252 video_device = video->attached_array[i].bind_info;
2253 if (video_device && video_device->backlight)
2254 acpi_video_set_brightness(video_device->backlight);
2255 }
2256 return AE_OK;
2257 }
2258
2259 static acpi_status
2260 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
2261 void **return_value)
2262 {
2263 struct acpi_device *device = context;
2264 struct acpi_device *sibling;
2265 int result;
2266
2267 if (handle == device->handle)
2268 return AE_CTRL_TERMINATE;
2269
2270 result = acpi_bus_get_device(handle, &sibling);
2271 if (result)
2272 return AE_OK;
2273
2274 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
2275 return AE_ALREADY_EXISTS;
2276
2277 return AE_OK;
2278 }
2279
2280 static int acpi_video_bus_add(struct acpi_device *device)
2281 {
2282 struct acpi_video_bus *video;
2283 struct input_dev *input;
2284 int error;
2285 acpi_status status;
2286
2287 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
2288 device->parent->handle, 1,
2289 acpi_video_bus_match, NULL,
2290 device, NULL);
2291 if (status == AE_ALREADY_EXISTS) {
2292 printk(KERN_WARNING FW_BUG
2293 "Duplicate ACPI video bus devices for the"
2294 " same VGA controller, please try module "
2295 "parameter \"video.allow_duplicates=1\""
2296 "if the current driver doesn't work.\n");
2297 if (!allow_duplicates)
2298 return -ENODEV;
2299 }
2300
2301 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2302 if (!video)
2303 return -ENOMEM;
2304
2305 /* a hack to fix the duplicate name "VID" problem on T61 */
2306 if (!strcmp(device->pnp.bus_id, "VID")) {
2307 if (instance)
2308 device->pnp.bus_id[3] = '0' + instance;
2309 instance ++;
2310 }
2311 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2312 if (!strcmp(device->pnp.bus_id, "VGA")) {
2313 if (instance)
2314 device->pnp.bus_id[3] = '0' + instance;
2315 instance++;
2316 }
2317
2318 video->device = device;
2319 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2320 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2321 device->driver_data = video;
2322
2323 acpi_video_bus_find_cap(video);
2324 error = acpi_video_bus_check(video);
2325 if (error)
2326 goto err_free_video;
2327
2328 error = acpi_video_bus_add_fs(device);
2329 if (error)
2330 goto err_free_video;
2331
2332 mutex_init(&video->device_list_lock);
2333 INIT_LIST_HEAD(&video->video_device_list);
2334
2335 acpi_video_bus_get_devices(video, device);
2336 acpi_video_bus_start_devices(video);
2337
2338 video->input = input = input_allocate_device();
2339 if (!input) {
2340 error = -ENOMEM;
2341 goto err_stop_video;
2342 }
2343
2344 snprintf(video->phys, sizeof(video->phys),
2345 "%s/video/input0", acpi_device_hid(video->device));
2346
2347 input->name = acpi_device_name(video->device);
2348 input->phys = video->phys;
2349 input->id.bustype = BUS_HOST;
2350 input->id.product = 0x06;
2351 input->dev.parent = &device->dev;
2352 input->evbit[0] = BIT(EV_KEY);
2353 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2354 set_bit(KEY_VIDEO_NEXT, input->keybit);
2355 set_bit(KEY_VIDEO_PREV, input->keybit);
2356 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2357 set_bit(KEY_BRIGHTNESSUP, input->keybit);
2358 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2359 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2360 set_bit(KEY_DISPLAY_OFF, input->keybit);
2361 set_bit(KEY_UNKNOWN, input->keybit);
2362
2363 error = input_register_device(input);
2364 if (error)
2365 goto err_free_input_dev;
2366
2367 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
2368 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2369 video->flags.multihead ? "yes" : "no",
2370 video->flags.rom ? "yes" : "no",
2371 video->flags.post ? "yes" : "no");
2372
2373 return 0;
2374
2375 err_free_input_dev:
2376 input_free_device(input);
2377 err_stop_video:
2378 acpi_video_bus_stop_devices(video);
2379 acpi_video_bus_put_devices(video);
2380 kfree(video->attached_array);
2381 acpi_video_bus_remove_fs(device);
2382 err_free_video:
2383 kfree(video);
2384 device->driver_data = NULL;
2385
2386 return error;
2387 }
2388
2389 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2390 {
2391 struct acpi_video_bus *video = NULL;
2392
2393
2394 if (!device || !acpi_driver_data(device))
2395 return -EINVAL;
2396
2397 video = acpi_driver_data(device);
2398
2399 acpi_video_bus_stop_devices(video);
2400 acpi_video_bus_put_devices(video);
2401 acpi_video_bus_remove_fs(device);
2402
2403 input_unregister_device(video->input);
2404 kfree(video->attached_array);
2405 kfree(video);
2406
2407 return 0;
2408 }
2409
2410 static int __init intel_opregion_present(void)
2411 {
2412 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
2413 struct pci_dev *dev = NULL;
2414 u32 address;
2415
2416 for_each_pci_dev(dev) {
2417 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2418 continue;
2419 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2420 continue;
2421 pci_read_config_dword(dev, 0xfc, &address);
2422 if (!address)
2423 continue;
2424 return 1;
2425 }
2426 #endif
2427 return 0;
2428 }
2429
2430 int acpi_video_register(void)
2431 {
2432 int result = 0;
2433 if (register_count) {
2434 /*
2435 * if the function of acpi_video_register is already called,
2436 * don't register the acpi_vide_bus again and return no error.
2437 */
2438 return 0;
2439 }
2440
2441 acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2442 if (!acpi_video_dir)
2443 return -ENODEV;
2444
2445 result = acpi_bus_register_driver(&acpi_video_bus);
2446 if (result < 0) {
2447 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2448 return -ENODEV;
2449 }
2450
2451 /*
2452 * When the acpi_video_bus is loaded successfully, increase
2453 * the counter reference.
2454 */
2455 register_count = 1;
2456
2457 return 0;
2458 }
2459 EXPORT_SYMBOL(acpi_video_register);
2460
2461 void acpi_video_unregister(void)
2462 {
2463 if (!register_count) {
2464 /*
2465 * If the acpi video bus is already unloaded, don't
2466 * unload it again and return directly.
2467 */
2468 return;
2469 }
2470 acpi_bus_unregister_driver(&acpi_video_bus);
2471
2472 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2473
2474 register_count = 0;
2475
2476 return;
2477 }
2478 EXPORT_SYMBOL(acpi_video_unregister);
2479
2480 /*
2481 * This is kind of nasty. Hardware using Intel chipsets may require
2482 * the video opregion code to be run first in order to initialise
2483 * state before any ACPI video calls are made. To handle this we defer
2484 * registration of the video class until the opregion code has run.
2485 */
2486
2487 static int __init acpi_video_init(void)
2488 {
2489 dmi_check_system(video_dmi_table);
2490
2491 if (intel_opregion_present())
2492 return 0;
2493
2494 return acpi_video_register();
2495 }
2496
2497 static void __exit acpi_video_exit(void)
2498 {
2499 acpi_video_unregister();
2500
2501 return;
2502 }
2503
2504 module_init(acpi_video_init);
2505 module_exit(acpi_video_exit);
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