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Staging: strip: delete the driver
[linux/fpc-iii.git] / drivers / acpi / video.c
bloba0c93b3214827a69bd4ada20fb5742b4dbbfc381
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 #include <linux/suspend.h>
48
49 #define PREFIX "ACPI: "
50
51 #define ACPI_VIDEO_CLASS "video"
52 #define ACPI_VIDEO_BUS_NAME "Video Bus"
53 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
54 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
55 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
56 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
57 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
58 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
59
60 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
61 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
62 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
63 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
64 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
65
66 #define MAX_NAME_LEN 20
67
68 #define ACPI_VIDEO_DISPLAY_CRT 1
69 #define ACPI_VIDEO_DISPLAY_TV 2
70 #define ACPI_VIDEO_DISPLAY_DVI 3
71 #define ACPI_VIDEO_DISPLAY_LCD 4
72
73 #define _COMPONENT ACPI_VIDEO_COMPONENT
74 ACPI_MODULE_NAME("video");
75
76 MODULE_AUTHOR("Bruno Ducrot");
77 MODULE_DESCRIPTION("ACPI Video Driver");
78 MODULE_LICENSE("GPL");
79
80 static int brightness_switch_enabled = 1;
81 module_param(brightness_switch_enabled, bool, 0644);
82
83 /*
84 * By default, we don't allow duplicate ACPI video bus devices
85 * under the same VGA controller
86 */
87 static int allow_duplicates;
88 module_param(allow_duplicates, bool, 0644);
89
90 static int register_count = 0;
91 static int acpi_video_bus_add(struct acpi_device *device);
92 static int acpi_video_bus_remove(struct acpi_device *device, int type);
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 .notify = acpi_video_bus_notify,
109 },
110 };
111
112 struct acpi_video_bus_flags {
113 u8 multihead:1; /* can switch video heads */
114 u8 rom:1; /* can retrieve a video rom */
115 u8 post:1; /* can configure the head to */
116 u8 reserved:5;
117 };
118
119 struct acpi_video_bus_cap {
120 u8 _DOS:1; /*Enable/Disable output switching */
121 u8 _DOD:1; /*Enumerate all devices attached to display adapter */
122 u8 _ROM:1; /*Get ROM Data */
123 u8 _GPD:1; /*Get POST Device */
124 u8 _SPD:1; /*Set POST Device */
125 u8 _VPO:1; /*Video POST Options */
126 u8 reserved:2;
127 };
128
129 struct acpi_video_device_attrib {
130 u32 display_index:4; /* A zero-based instance of the Display */
131 u32 display_port_attachment:4; /*This field differentiates the display type */
132 u32 display_type:4; /*Describe the specific type in use */
133 u32 vendor_specific:4; /*Chipset Vendor Specific */
134 u32 bios_can_detect:1; /*BIOS can detect the device */
135 u32 depend_on_vga:1; /*Non-VGA output device whose power is related to
136 the VGA device. */
137 u32 pipe_id:3; /*For VGA multiple-head devices. */
138 u32 reserved:10; /*Must be 0 */
139 u32 device_id_scheme:1; /*Device ID Scheme */
140 };
141
142 struct acpi_video_enumerated_device {
143 union {
144 u32 int_val;
145 struct acpi_video_device_attrib attrib;
146 } value;
147 struct acpi_video_device *bind_info;
148 };
149
150 struct acpi_video_bus {
151 struct acpi_device *device;
152 u8 dos_setting;
153 struct acpi_video_enumerated_device *attached_array;
154 u8 attached_count;
155 struct acpi_video_bus_cap cap;
156 struct acpi_video_bus_flags flags;
157 struct list_head video_device_list;
158 struct mutex device_list_lock; /* protects video_device_list */
159 struct proc_dir_entry *dir;
160 struct input_dev *input;
161 char phys[32]; /* for input device */
162 struct notifier_block pm_nb;
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 /*
1025 * Save current brightness level in case we have to restore it
1026 * before acpi_video_device_lcd_set_level() is called next time.
1027 */
1028 device->backlight->props.brightness =
1029 acpi_video_get_brightness(device->backlight);
1030
1031 result = sysfs_create_link(&device->backlight->dev.kobj,
1032 &device->dev->dev.kobj, "device");
1033 if (result)
1034 printk(KERN_ERR PREFIX "Create sysfs link\n");
1035
1036 device->cooling_dev = thermal_cooling_device_register("LCD",
1037 device->dev, &video_cooling_ops);
1038 if (IS_ERR(device->cooling_dev)) {
1039 /*
1040 * Set cooling_dev to NULL so we don't crash trying to
1041 * free it.
1042 * Also, why the hell we are returning early and
1043 * not attempt to register video output if cooling
1044 * device registration failed?
1045 * -- dtor
1046 */
1047 device->cooling_dev = NULL;
1048 return;
1049 }
1050
1051 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1052 device->cooling_dev->id);
1053 result = sysfs_create_link(&device->dev->dev.kobj,
1054 &device->cooling_dev->device.kobj,
1055 "thermal_cooling");
1056 if (result)
1057 printk(KERN_ERR PREFIX "Create sysfs link\n");
1058 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1059 &device->dev->dev.kobj, "device");
1060 if (result)
1061 printk(KERN_ERR PREFIX "Create sysfs link\n");
1062
1063 }
1064
1065 if (acpi_video_display_switch_support()) {
1066
1067 if (device->cap._DCS && device->cap._DSS) {
1068 static int count;
1069 char *name;
1070 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
1071 if (!name)
1072 return;
1073 sprintf(name, "acpi_video%d", count++);
1074 device->output_dev = video_output_register(name,
1075 NULL, device, &acpi_output_properties);
1076 kfree(name);
1077 }
1078 }
1079 }
1080
1081 /*
1082 * Arg:
1083 * device : video output device (VGA)
1084 *
1085 * Return Value:
1086 * None
1087 *
1088 * Find out all required AML methods defined under the video bus device.
1089 */
1090
1091 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1092 {
1093 acpi_handle h_dummy1;
1094
1095 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
1096 video->cap._DOS = 1;
1097 }
1098 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
1099 video->cap._DOD = 1;
1100 }
1101 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
1102 video->cap._ROM = 1;
1103 }
1104 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
1105 video->cap._GPD = 1;
1106 }
1107 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
1108 video->cap._SPD = 1;
1109 }
1110 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
1111 video->cap._VPO = 1;
1112 }
1113 }
1114
1115 /*
1116 * Check whether the video bus device has required AML method to
1117 * support the desired features
1118 */
1119
1120 static int acpi_video_bus_check(struct acpi_video_bus *video)
1121 {
1122 acpi_status status = -ENOENT;
1123 struct pci_dev *dev;
1124
1125 if (!video)
1126 return -EINVAL;
1127
1128 dev = acpi_get_pci_dev(video->device->handle);
1129 if (!dev)
1130 return -ENODEV;
1131 pci_dev_put(dev);
1132
1133 /* Since there is no HID, CID and so on for VGA driver, we have
1134 * to check well known required nodes.
1135 */
1136
1137 /* Does this device support video switching? */
1138 if (video->cap._DOS || video->cap._DOD) {
1139 if (!video->cap._DOS) {
1140 printk(KERN_WARNING FW_BUG
1141 "ACPI(%s) defines _DOD but not _DOS\n",
1142 acpi_device_bid(video->device));
1143 }
1144 video->flags.multihead = 1;
1145 status = 0;
1146 }
1147
1148 /* Does this device support retrieving a video ROM? */
1149 if (video->cap._ROM) {
1150 video->flags.rom = 1;
1151 status = 0;
1152 }
1153
1154 /* Does this device support configuring which video device to POST? */
1155 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1156 video->flags.post = 1;
1157 status = 0;
1158 }
1159
1160 return status;
1161 }
1162
1163 /* --------------------------------------------------------------------------
1164 FS Interface (/proc)
1165 -------------------------------------------------------------------------- */
1166
1167 static struct proc_dir_entry *acpi_video_dir;
1168
1169 /* video devices */
1170
1171 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
1172 {
1173 struct acpi_video_device *dev = seq->private;
1174
1175
1176 if (!dev)
1177 goto end;
1178
1179 seq_printf(seq, "device_id: 0x%04x\n", (u32) dev->device_id);
1180 seq_printf(seq, "type: ");
1181 if (dev->flags.crt)
1182 seq_printf(seq, "CRT\n");
1183 else if (dev->flags.lcd)
1184 seq_printf(seq, "LCD\n");
1185 else if (dev->flags.tvout)
1186 seq_printf(seq, "TVOUT\n");
1187 else if (dev->flags.dvi)
1188 seq_printf(seq, "DVI\n");
1189 else
1190 seq_printf(seq, "UNKNOWN\n");
1191
1192 seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
1193
1194 end:
1195 return 0;
1196 }
1197
1198 static int
1199 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
1200 {
1201 return single_open(file, acpi_video_device_info_seq_show,
1202 PDE(inode)->data);
1203 }
1204
1205 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
1206 {
1207 int status;
1208 struct acpi_video_device *dev = seq->private;
1209 unsigned long long state;
1210
1211
1212 if (!dev)
1213 goto end;
1214
1215 status = acpi_video_device_get_state(dev, &state);
1216 seq_printf(seq, "state: ");
1217 if (ACPI_SUCCESS(status))
1218 seq_printf(seq, "0x%02llx\n", state);
1219 else
1220 seq_printf(seq, "<not supported>\n");
1221
1222 status = acpi_video_device_query(dev, &state);
1223 seq_printf(seq, "query: ");
1224 if (ACPI_SUCCESS(status))
1225 seq_printf(seq, "0x%02llx\n", state);
1226 else
1227 seq_printf(seq, "<not supported>\n");
1228
1229 end:
1230 return 0;
1231 }
1232
1233 static int
1234 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
1235 {
1236 return single_open(file, acpi_video_device_state_seq_show,
1237 PDE(inode)->data);
1238 }
1239
1240 static ssize_t
1241 acpi_video_device_write_state(struct file *file,
1242 const char __user * buffer,
1243 size_t count, loff_t * data)
1244 {
1245 int status;
1246 struct seq_file *m = file->private_data;
1247 struct acpi_video_device *dev = m->private;
1248 char str[12] = { 0 };
1249 u32 state = 0;
1250
1251
1252 if (!dev || count >= sizeof(str))
1253 return -EINVAL;
1254
1255 if (copy_from_user(str, buffer, count))
1256 return -EFAULT;
1257
1258 str[count] = 0;
1259 state = simple_strtoul(str, NULL, 0);
1260 state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
1261
1262 status = acpi_video_device_set_state(dev, state);
1263
1264 if (status)
1265 return -EFAULT;
1266
1267 return count;
1268 }
1269
1270 static int
1271 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
1272 {
1273 struct acpi_video_device *dev = seq->private;
1274 int i;
1275
1276
1277 if (!dev || !dev->brightness) {
1278 seq_printf(seq, "<not supported>\n");
1279 return 0;
1280 }
1281
1282 seq_printf(seq, "levels: ");
1283 for (i = 2; i < dev->brightness->count; i++)
1284 seq_printf(seq, " %d", dev->brightness->levels[i]);
1285 seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
1286
1287 return 0;
1288 }
1289
1290 static int
1291 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1292 {
1293 return single_open(file, acpi_video_device_brightness_seq_show,
1294 PDE(inode)->data);
1295 }
1296
1297 static ssize_t
1298 acpi_video_device_write_brightness(struct file *file,
1299 const char __user * buffer,
1300 size_t count, loff_t * data)
1301 {
1302 struct seq_file *m = file->private_data;
1303 struct acpi_video_device *dev = m->private;
1304 char str[5] = { 0 };
1305 unsigned int level = 0;
1306 int i;
1307
1308
1309 if (!dev || !dev->brightness || count >= sizeof(str))
1310 return -EINVAL;
1311
1312 if (copy_from_user(str, buffer, count))
1313 return -EFAULT;
1314
1315 str[count] = 0;
1316 level = simple_strtoul(str, NULL, 0);
1317
1318 if (level > 100)
1319 return -EFAULT;
1320
1321 /* validate through the list of available levels */
1322 for (i = 2; i < dev->brightness->count; i++)
1323 if (level == dev->brightness->levels[i]) {
1324 if (!acpi_video_device_lcd_set_level(dev, level))
1325 return count;
1326 break;
1327 }
1328
1329 return -EINVAL;
1330 }
1331
1332 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1333 {
1334 struct acpi_video_device *dev = seq->private;
1335 int status;
1336 int i;
1337 union acpi_object *edid = NULL;
1338
1339
1340 if (!dev)
1341 goto out;
1342
1343 status = acpi_video_device_EDID(dev, &edid, 128);
1344 if (ACPI_FAILURE(status)) {
1345 status = acpi_video_device_EDID(dev, &edid, 256);
1346 }
1347
1348 if (ACPI_FAILURE(status)) {
1349 goto out;
1350 }
1351
1352 if (edid && edid->type == ACPI_TYPE_BUFFER) {
1353 for (i = 0; i < edid->buffer.length; i++)
1354 seq_putc(seq, edid->buffer.pointer[i]);
1355 }
1356
1357 out:
1358 if (!edid)
1359 seq_printf(seq, "<not supported>\n");
1360 else
1361 kfree(edid);
1362
1363 return 0;
1364 }
1365
1366 static int
1367 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1368 {
1369 return single_open(file, acpi_video_device_EDID_seq_show,
1370 PDE(inode)->data);
1371 }
1372
1373 static int acpi_video_device_add_fs(struct acpi_device *device)
1374 {
1375 struct proc_dir_entry *entry, *device_dir;
1376 struct acpi_video_device *vid_dev;
1377
1378 vid_dev = acpi_driver_data(device);
1379 if (!vid_dev)
1380 return -ENODEV;
1381
1382 device_dir = proc_mkdir(acpi_device_bid(device),
1383 vid_dev->video->dir);
1384 if (!device_dir)
1385 return -ENOMEM;
1386
1387 /* 'info' [R] */
1388 entry = proc_create_data("info", S_IRUGO, device_dir,
1389 &acpi_video_device_info_fops, acpi_driver_data(device));
1390 if (!entry)
1391 goto err_remove_dir;
1392
1393 /* 'state' [R/W] */
1394 entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1395 device_dir,
1396 &acpi_video_device_state_fops,
1397 acpi_driver_data(device));
1398 if (!entry)
1399 goto err_remove_info;
1400
1401 /* 'brightness' [R/W] */
1402 entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1403 device_dir,
1404 &acpi_video_device_brightness_fops,
1405 acpi_driver_data(device));
1406 if (!entry)
1407 goto err_remove_state;
1408
1409 /* 'EDID' [R] */
1410 entry = proc_create_data("EDID", S_IRUGO, device_dir,
1411 &acpi_video_device_EDID_fops,
1412 acpi_driver_data(device));
1413 if (!entry)
1414 goto err_remove_brightness;
1415
1416 acpi_device_dir(device) = device_dir;
1417
1418 return 0;
1419
1420 err_remove_brightness:
1421 remove_proc_entry("brightness", device_dir);
1422 err_remove_state:
1423 remove_proc_entry("state", device_dir);
1424 err_remove_info:
1425 remove_proc_entry("info", device_dir);
1426 err_remove_dir:
1427 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1428 return -ENOMEM;
1429 }
1430
1431 static int acpi_video_device_remove_fs(struct acpi_device *device)
1432 {
1433 struct acpi_video_device *vid_dev;
1434 struct proc_dir_entry *device_dir;
1435
1436 vid_dev = acpi_driver_data(device);
1437 if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1438 return -ENODEV;
1439
1440 device_dir = acpi_device_dir(device);
1441 if (device_dir) {
1442 remove_proc_entry("info", device_dir);
1443 remove_proc_entry("state", device_dir);
1444 remove_proc_entry("brightness", device_dir);
1445 remove_proc_entry("EDID", device_dir);
1446 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1447 acpi_device_dir(device) = NULL;
1448 }
1449
1450 return 0;
1451 }
1452
1453 /* video bus */
1454 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1455 {
1456 struct acpi_video_bus *video = seq->private;
1457
1458
1459 if (!video)
1460 goto end;
1461
1462 seq_printf(seq, "Switching heads: %s\n",
1463 video->flags.multihead ? "yes" : "no");
1464 seq_printf(seq, "Video ROM: %s\n",
1465 video->flags.rom ? "yes" : "no");
1466 seq_printf(seq, "Device to be POSTed on boot: %s\n",
1467 video->flags.post ? "yes" : "no");
1468
1469 end:
1470 return 0;
1471 }
1472
1473 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1474 {
1475 return single_open(file, acpi_video_bus_info_seq_show,
1476 PDE(inode)->data);
1477 }
1478
1479 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1480 {
1481 struct acpi_video_bus *video = seq->private;
1482
1483
1484 if (!video)
1485 goto end;
1486
1487 printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1488 seq_printf(seq, "<TODO>\n");
1489
1490 end:
1491 return 0;
1492 }
1493
1494 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1495 {
1496 return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1497 }
1498
1499 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1500 {
1501 struct acpi_video_bus *video = seq->private;
1502 unsigned long long options;
1503 int status;
1504
1505
1506 if (!video)
1507 goto end;
1508
1509 status = acpi_video_bus_POST_options(video, &options);
1510 if (ACPI_SUCCESS(status)) {
1511 if (!(options & 1)) {
1512 printk(KERN_WARNING PREFIX
1513 "The motherboard VGA device is not listed as a possible POST device.\n");
1514 printk(KERN_WARNING PREFIX
1515 "This indicates a BIOS bug. Please contact the manufacturer.\n");
1516 }
1517 printk(KERN_WARNING "%llx\n", options);
1518 seq_printf(seq, "can POST: <integrated video>");
1519 if (options & 2)
1520 seq_printf(seq, " <PCI video>");
1521 if (options & 4)
1522 seq_printf(seq, " <AGP video>");
1523 seq_putc(seq, '\n');
1524 } else
1525 seq_printf(seq, "<not supported>\n");
1526 end:
1527 return 0;
1528 }
1529
1530 static int
1531 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1532 {
1533 return single_open(file, acpi_video_bus_POST_info_seq_show,
1534 PDE(inode)->data);
1535 }
1536
1537 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1538 {
1539 struct acpi_video_bus *video = seq->private;
1540 int status;
1541 unsigned long long id;
1542
1543
1544 if (!video)
1545 goto end;
1546
1547 status = acpi_video_bus_get_POST(video, &id);
1548 if (!ACPI_SUCCESS(status)) {
1549 seq_printf(seq, "<not supported>\n");
1550 goto end;
1551 }
1552 seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1553
1554 end:
1555 return 0;
1556 }
1557
1558 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1559 {
1560 struct acpi_video_bus *video = seq->private;
1561
1562
1563 seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1564
1565 return 0;
1566 }
1567
1568 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1569 {
1570 return single_open(file, acpi_video_bus_POST_seq_show,
1571 PDE(inode)->data);
1572 }
1573
1574 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1575 {
1576 return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1577 }
1578
1579 static ssize_t
1580 acpi_video_bus_write_POST(struct file *file,
1581 const char __user * buffer,
1582 size_t count, loff_t * data)
1583 {
1584 int status;
1585 struct seq_file *m = file->private_data;
1586 struct acpi_video_bus *video = m->private;
1587 char str[12] = { 0 };
1588 unsigned long long opt, options;
1589
1590
1591 if (!video || count >= sizeof(str))
1592 return -EINVAL;
1593
1594 status = acpi_video_bus_POST_options(video, &options);
1595 if (!ACPI_SUCCESS(status))
1596 return -EINVAL;
1597
1598 if (copy_from_user(str, buffer, count))
1599 return -EFAULT;
1600
1601 str[count] = 0;
1602 opt = strtoul(str, NULL, 0);
1603 if (opt > 3)
1604 return -EFAULT;
1605
1606 /* just in case an OEM 'forgot' the motherboard... */
1607 options |= 1;
1608
1609 if (options & (1ul << opt)) {
1610 status = acpi_video_bus_set_POST(video, opt);
1611 if (!ACPI_SUCCESS(status))
1612 return -EFAULT;
1613
1614 }
1615
1616 return count;
1617 }
1618
1619 static ssize_t
1620 acpi_video_bus_write_DOS(struct file *file,
1621 const char __user * buffer,
1622 size_t count, loff_t * data)
1623 {
1624 int status;
1625 struct seq_file *m = file->private_data;
1626 struct acpi_video_bus *video = m->private;
1627 char str[12] = { 0 };
1628 unsigned long opt;
1629
1630
1631 if (!video || count >= sizeof(str))
1632 return -EINVAL;
1633
1634 if (copy_from_user(str, buffer, count))
1635 return -EFAULT;
1636
1637 str[count] = 0;
1638 opt = strtoul(str, NULL, 0);
1639 if (opt > 7)
1640 return -EFAULT;
1641
1642 status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1643
1644 if (!ACPI_SUCCESS(status))
1645 return -EFAULT;
1646
1647 return count;
1648 }
1649
1650 static int acpi_video_bus_add_fs(struct acpi_device *device)
1651 {
1652 struct acpi_video_bus *video = acpi_driver_data(device);
1653 struct proc_dir_entry *device_dir;
1654 struct proc_dir_entry *entry;
1655
1656 device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1657 if (!device_dir)
1658 return -ENOMEM;
1659
1660 /* 'info' [R] */
1661 entry = proc_create_data("info", S_IRUGO, device_dir,
1662 &acpi_video_bus_info_fops,
1663 acpi_driver_data(device));
1664 if (!entry)
1665 goto err_remove_dir;
1666
1667 /* 'ROM' [R] */
1668 entry = proc_create_data("ROM", S_IRUGO, device_dir,
1669 &acpi_video_bus_ROM_fops,
1670 acpi_driver_data(device));
1671 if (!entry)
1672 goto err_remove_info;
1673
1674 /* 'POST_info' [R] */
1675 entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1676 &acpi_video_bus_POST_info_fops,
1677 acpi_driver_data(device));
1678 if (!entry)
1679 goto err_remove_rom;
1680
1681 /* 'POST' [R/W] */
1682 entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1683 device_dir,
1684 &acpi_video_bus_POST_fops,
1685 acpi_driver_data(device));
1686 if (!entry)
1687 goto err_remove_post_info;
1688
1689 /* 'DOS' [R/W] */
1690 entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1691 device_dir,
1692 &acpi_video_bus_DOS_fops,
1693 acpi_driver_data(device));
1694 if (!entry)
1695 goto err_remove_post;
1696
1697 video->dir = acpi_device_dir(device) = device_dir;
1698 return 0;
1699
1700 err_remove_post:
1701 remove_proc_entry("POST", device_dir);
1702 err_remove_post_info:
1703 remove_proc_entry("POST_info", device_dir);
1704 err_remove_rom:
1705 remove_proc_entry("ROM", device_dir);
1706 err_remove_info:
1707 remove_proc_entry("info", device_dir);
1708 err_remove_dir:
1709 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1710 return -ENOMEM;
1711 }
1712
1713 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1714 {
1715 struct proc_dir_entry *device_dir = acpi_device_dir(device);
1716
1717 if (device_dir) {
1718 remove_proc_entry("info", device_dir);
1719 remove_proc_entry("ROM", device_dir);
1720 remove_proc_entry("POST_info", device_dir);
1721 remove_proc_entry("POST", device_dir);
1722 remove_proc_entry("DOS", device_dir);
1723 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1724 acpi_device_dir(device) = NULL;
1725 }
1726
1727 return 0;
1728 }
1729
1730 /* --------------------------------------------------------------------------
1731 Driver Interface
1732 -------------------------------------------------------------------------- */
1733
1734 /* device interface */
1735 static struct acpi_video_device_attrib*
1736 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1737 {
1738 struct acpi_video_enumerated_device *ids;
1739 int i;
1740
1741 for (i = 0; i < video->attached_count; i++) {
1742 ids = &video->attached_array[i];
1743 if ((ids->value.int_val & 0xffff) == device_id)
1744 return &ids->value.attrib;
1745 }
1746
1747 return NULL;
1748 }
1749
1750 static int
1751 acpi_video_bus_get_one_device(struct acpi_device *device,
1752 struct acpi_video_bus *video)
1753 {
1754 unsigned long long device_id;
1755 int status;
1756 struct acpi_video_device *data;
1757 struct acpi_video_device_attrib* attribute;
1758
1759 if (!device || !video)
1760 return -EINVAL;
1761
1762 status =
1763 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1764 if (ACPI_SUCCESS(status)) {
1765
1766 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1767 if (!data)
1768 return -ENOMEM;
1769
1770 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1771 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1772 device->driver_data = data;
1773
1774 data->device_id = device_id;
1775 data->video = video;
1776 data->dev = device;
1777
1778 attribute = acpi_video_get_device_attr(video, device_id);
1779
1780 if((attribute != NULL) && attribute->device_id_scheme) {
1781 switch (attribute->display_type) {
1782 case ACPI_VIDEO_DISPLAY_CRT:
1783 data->flags.crt = 1;
1784 break;
1785 case ACPI_VIDEO_DISPLAY_TV:
1786 data->flags.tvout = 1;
1787 break;
1788 case ACPI_VIDEO_DISPLAY_DVI:
1789 data->flags.dvi = 1;
1790 break;
1791 case ACPI_VIDEO_DISPLAY_LCD:
1792 data->flags.lcd = 1;
1793 break;
1794 default:
1795 data->flags.unknown = 1;
1796 break;
1797 }
1798 if(attribute->bios_can_detect)
1799 data->flags.bios = 1;
1800 } else
1801 data->flags.unknown = 1;
1802
1803 acpi_video_device_bind(video, data);
1804 acpi_video_device_find_cap(data);
1805
1806 status = acpi_install_notify_handler(device->handle,
1807 ACPI_DEVICE_NOTIFY,
1808 acpi_video_device_notify,
1809 data);
1810 if (ACPI_FAILURE(status)) {
1811 printk(KERN_ERR PREFIX
1812 "Error installing notify handler\n");
1813 if(data->brightness)
1814 kfree(data->brightness->levels);
1815 kfree(data->brightness);
1816 kfree(data);
1817 return -ENODEV;
1818 }
1819
1820 mutex_lock(&video->device_list_lock);
1821 list_add_tail(&data->entry, &video->video_device_list);
1822 mutex_unlock(&video->device_list_lock);
1823
1824 acpi_video_device_add_fs(device);
1825
1826 return 0;
1827 }
1828
1829 return -ENOENT;
1830 }
1831
1832 /*
1833 * Arg:
1834 * video : video bus device
1835 *
1836 * Return:
1837 * none
1838 *
1839 * Enumerate the video device list of the video bus,
1840 * bind the ids with the corresponding video devices
1841 * under the video bus.
1842 */
1843
1844 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1845 {
1846 struct acpi_video_device *dev;
1847
1848 mutex_lock(&video->device_list_lock);
1849
1850 list_for_each_entry(dev, &video->video_device_list, entry)
1851 acpi_video_device_bind(video, dev);
1852
1853 mutex_unlock(&video->device_list_lock);
1854 }
1855
1856 /*
1857 * Arg:
1858 * video : video bus device
1859 * device : video output device under the video
1860 * bus
1861 *
1862 * Return:
1863 * none
1864 *
1865 * Bind the ids with the corresponding video devices
1866 * under the video bus.
1867 */
1868
1869 static void
1870 acpi_video_device_bind(struct acpi_video_bus *video,
1871 struct acpi_video_device *device)
1872 {
1873 struct acpi_video_enumerated_device *ids;
1874 int i;
1875
1876 for (i = 0; i < video->attached_count; i++) {
1877 ids = &video->attached_array[i];
1878 if (device->device_id == (ids->value.int_val & 0xffff)) {
1879 ids->bind_info = device;
1880 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1881 }
1882 }
1883 }
1884
1885 /*
1886 * Arg:
1887 * video : video bus device
1888 *
1889 * Return:
1890 * < 0 : error
1891 *
1892 * Call _DOD to enumerate all devices attached to display adapter
1893 *
1894 */
1895
1896 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1897 {
1898 int status;
1899 int count;
1900 int i;
1901 struct acpi_video_enumerated_device *active_list;
1902 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1903 union acpi_object *dod = NULL;
1904 union acpi_object *obj;
1905
1906 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1907 if (!ACPI_SUCCESS(status)) {
1908 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1909 return status;
1910 }
1911
1912 dod = buffer.pointer;
1913 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1914 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1915 status = -EFAULT;
1916 goto out;
1917 }
1918
1919 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1920 dod->package.count));
1921
1922 active_list = kcalloc(1 + dod->package.count,
1923 sizeof(struct acpi_video_enumerated_device),
1924 GFP_KERNEL);
1925 if (!active_list) {
1926 status = -ENOMEM;
1927 goto out;
1928 }
1929
1930 count = 0;
1931 for (i = 0; i < dod->package.count; i++) {
1932 obj = &dod->package.elements[i];
1933
1934 if (obj->type != ACPI_TYPE_INTEGER) {
1935 printk(KERN_ERR PREFIX
1936 "Invalid _DOD data in element %d\n", i);
1937 continue;
1938 }
1939
1940 active_list[count].value.int_val = obj->integer.value;
1941 active_list[count].bind_info = NULL;
1942 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1943 (int)obj->integer.value));
1944 count++;
1945 }
1946
1947 kfree(video->attached_array);
1948
1949 video->attached_array = active_list;
1950 video->attached_count = count;
1951
1952 out:
1953 kfree(buffer.pointer);
1954 return status;
1955 }
1956
1957 static int
1958 acpi_video_get_next_level(struct acpi_video_device *device,
1959 u32 level_current, u32 event)
1960 {
1961 int min, max, min_above, max_below, i, l, delta = 255;
1962 max = max_below = 0;
1963 min = min_above = 255;
1964 /* Find closest level to level_current */
1965 for (i = 2; i < device->brightness->count; i++) {
1966 l = device->brightness->levels[i];
1967 if (abs(l - level_current) < abs(delta)) {
1968 delta = l - level_current;
1969 if (!delta)
1970 break;
1971 }
1972 }
1973 /* Ajust level_current to closest available level */
1974 level_current += delta;
1975 for (i = 2; i < device->brightness->count; i++) {
1976 l = device->brightness->levels[i];
1977 if (l < min)
1978 min = l;
1979 if (l > max)
1980 max = l;
1981 if (l < min_above && l > level_current)
1982 min_above = l;
1983 if (l > max_below && l < level_current)
1984 max_below = l;
1985 }
1986
1987 switch (event) {
1988 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1989 return (level_current < max) ? min_above : min;
1990 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1991 return (level_current < max) ? min_above : max;
1992 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1993 return (level_current > min) ? max_below : min;
1994 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1995 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1996 return 0;
1997 default:
1998 return level_current;
1999 }
2000 }
2001
2002 static int
2003 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
2004 {
2005 unsigned long long level_current, level_next;
2006 int result = -EINVAL;
2007
2008 /* no warning message if acpi_backlight=vendor is used */
2009 if (!acpi_video_backlight_support())
2010 return 0;
2011
2012 if (!device->brightness)
2013 goto out;
2014
2015 result = acpi_video_device_lcd_get_level_current(device,
2016 &level_current, 0);
2017 if (result)
2018 goto out;
2019
2020 level_next = acpi_video_get_next_level(device, level_current, event);
2021
2022 result = acpi_video_device_lcd_set_level(device, level_next);
2023
2024 if (!result)
2025 backlight_force_update(device->backlight,
2026 BACKLIGHT_UPDATE_HOTKEY);
2027
2028 out:
2029 if (result)
2030 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
2031
2032 return result;
2033 }
2034
2035 static int
2036 acpi_video_bus_get_devices(struct acpi_video_bus *video,
2037 struct acpi_device *device)
2038 {
2039 int status = 0;
2040 struct acpi_device *dev;
2041
2042 acpi_video_device_enumerate(video);
2043
2044 list_for_each_entry(dev, &device->children, node) {
2045
2046 status = acpi_video_bus_get_one_device(dev, video);
2047 if (ACPI_FAILURE(status)) {
2048 printk(KERN_WARNING PREFIX
2049 "Cant attach device");
2050 continue;
2051 }
2052 }
2053 return status;
2054 }
2055
2056 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
2057 {
2058 acpi_status status;
2059 struct acpi_video_bus *video;
2060
2061
2062 if (!device || !device->video)
2063 return -ENOENT;
2064
2065 video = device->video;
2066
2067 acpi_video_device_remove_fs(device->dev);
2068
2069 status = acpi_remove_notify_handler(device->dev->handle,
2070 ACPI_DEVICE_NOTIFY,
2071 acpi_video_device_notify);
2072 if (device->backlight) {
2073 sysfs_remove_link(&device->backlight->dev.kobj, "device");
2074 backlight_device_unregister(device->backlight);
2075 device->backlight = NULL;
2076 }
2077 if (device->cooling_dev) {
2078 sysfs_remove_link(&device->dev->dev.kobj,
2079 "thermal_cooling");
2080 sysfs_remove_link(&device->cooling_dev->device.kobj,
2081 "device");
2082 thermal_cooling_device_unregister(device->cooling_dev);
2083 device->cooling_dev = NULL;
2084 }
2085 video_output_unregister(device->output_dev);
2086
2087 return 0;
2088 }
2089
2090 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2091 {
2092 int status;
2093 struct acpi_video_device *dev, *next;
2094
2095 mutex_lock(&video->device_list_lock);
2096
2097 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2098
2099 status = acpi_video_bus_put_one_device(dev);
2100 if (ACPI_FAILURE(status))
2101 printk(KERN_WARNING PREFIX
2102 "hhuuhhuu bug in acpi video driver.\n");
2103
2104 if (dev->brightness) {
2105 kfree(dev->brightness->levels);
2106 kfree(dev->brightness);
2107 }
2108 list_del(&dev->entry);
2109 kfree(dev);
2110 }
2111
2112 mutex_unlock(&video->device_list_lock);
2113
2114 return 0;
2115 }
2116
2117 /* acpi_video interface */
2118
2119 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
2120 {
2121 return acpi_video_bus_DOS(video, 0, 0);
2122 }
2123
2124 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
2125 {
2126 return acpi_video_bus_DOS(video, 0, 1);
2127 }
2128
2129 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
2130 {
2131 struct acpi_video_bus *video = acpi_driver_data(device);
2132 struct input_dev *input;
2133 int keycode = 0;
2134
2135 if (!video)
2136 return;
2137
2138 input = video->input;
2139
2140 switch (event) {
2141 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
2142 * most likely via hotkey. */
2143 acpi_bus_generate_proc_event(device, event, 0);
2144 keycode = KEY_SWITCHVIDEOMODE;
2145 break;
2146
2147 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
2148 * connector. */
2149 acpi_video_device_enumerate(video);
2150 acpi_video_device_rebind(video);
2151 acpi_bus_generate_proc_event(device, event, 0);
2152 keycode = KEY_SWITCHVIDEOMODE;
2153 break;
2154
2155 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
2156 acpi_bus_generate_proc_event(device, event, 0);
2157 keycode = KEY_SWITCHVIDEOMODE;
2158 break;
2159 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
2160 acpi_bus_generate_proc_event(device, event, 0);
2161 keycode = KEY_VIDEO_NEXT;
2162 break;
2163 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
2164 acpi_bus_generate_proc_event(device, event, 0);
2165 keycode = KEY_VIDEO_PREV;
2166 break;
2167
2168 default:
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
2176 if (keycode) {
2177 input_report_key(input, keycode, 1);
2178 input_sync(input);
2179 input_report_key(input, keycode, 0);
2180 input_sync(input);
2181 }
2182
2183 return;
2184 }
2185
2186 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
2187 {
2188 struct acpi_video_device *video_device = data;
2189 struct acpi_device *device = NULL;
2190 struct acpi_video_bus *bus;
2191 struct input_dev *input;
2192 int keycode = 0;
2193
2194 if (!video_device)
2195 return;
2196
2197 device = video_device->dev;
2198 bus = video_device->video;
2199 input = bus->input;
2200
2201 switch (event) {
2202 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
2203 if (brightness_switch_enabled)
2204 acpi_video_switch_brightness(video_device, event);
2205 acpi_bus_generate_proc_event(device, event, 0);
2206 keycode = KEY_BRIGHTNESS_CYCLE;
2207 break;
2208 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
2209 if (brightness_switch_enabled)
2210 acpi_video_switch_brightness(video_device, event);
2211 acpi_bus_generate_proc_event(device, event, 0);
2212 keycode = KEY_BRIGHTNESSUP;
2213 break;
2214 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
2215 if (brightness_switch_enabled)
2216 acpi_video_switch_brightness(video_device, event);
2217 acpi_bus_generate_proc_event(device, event, 0);
2218 keycode = KEY_BRIGHTNESSDOWN;
2219 break;
2220 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
2221 if (brightness_switch_enabled)
2222 acpi_video_switch_brightness(video_device, event);
2223 acpi_bus_generate_proc_event(device, event, 0);
2224 keycode = KEY_BRIGHTNESS_ZERO;
2225 break;
2226 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
2227 if (brightness_switch_enabled)
2228 acpi_video_switch_brightness(video_device, event);
2229 acpi_bus_generate_proc_event(device, event, 0);
2230 keycode = KEY_DISPLAY_OFF;
2231 break;
2232 default:
2233 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2234 "Unsupported event [0x%x]\n", event));
2235 break;
2236 }
2237
2238 acpi_notifier_call_chain(device, event, 0);
2239
2240 if (keycode) {
2241 input_report_key(input, keycode, 1);
2242 input_sync(input);
2243 input_report_key(input, keycode, 0);
2244 input_sync(input);
2245 }
2246
2247 return;
2248 }
2249
2250 static int acpi_video_resume(struct notifier_block *nb,
2251 unsigned long val, void *ign)
2252 {
2253 struct acpi_video_bus *video;
2254 struct acpi_video_device *video_device;
2255 int i;
2256
2257 switch (val) {
2258 case PM_HIBERNATION_PREPARE:
2259 case PM_SUSPEND_PREPARE:
2260 case PM_RESTORE_PREPARE:
2261 return NOTIFY_DONE;
2262 }
2263
2264 video = container_of(nb, struct acpi_video_bus, pm_nb);
2265
2266 dev_info(&video->device->dev, "Restoring backlight state\n");
2267
2268 for (i = 0; i < video->attached_count; i++) {
2269 video_device = video->attached_array[i].bind_info;
2270 if (video_device && video_device->backlight)
2271 acpi_video_set_brightness(video_device->backlight);
2272 }
2273
2274 return NOTIFY_OK;
2275 }
2276
2277 static acpi_status
2278 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
2279 void **return_value)
2280 {
2281 struct acpi_device *device = context;
2282 struct acpi_device *sibling;
2283 int result;
2284
2285 if (handle == device->handle)
2286 return AE_CTRL_TERMINATE;
2287
2288 result = acpi_bus_get_device(handle, &sibling);
2289 if (result)
2290 return AE_OK;
2291
2292 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
2293 return AE_ALREADY_EXISTS;
2294
2295 return AE_OK;
2296 }
2297
2298 static int instance;
2299
2300 static int acpi_video_bus_add(struct acpi_device *device)
2301 {
2302 struct acpi_video_bus *video;
2303 struct input_dev *input;
2304 int error;
2305 acpi_status status;
2306
2307 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
2308 device->parent->handle, 1,
2309 acpi_video_bus_match, NULL,
2310 device, NULL);
2311 if (status == AE_ALREADY_EXISTS) {
2312 printk(KERN_WARNING FW_BUG
2313 "Duplicate ACPI video bus devices for the"
2314 " same VGA controller, please try module "
2315 "parameter \"video.allow_duplicates=1\""
2316 "if the current driver doesn't work.\n");
2317 if (!allow_duplicates)
2318 return -ENODEV;
2319 }
2320
2321 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2322 if (!video)
2323 return -ENOMEM;
2324
2325 /* a hack to fix the duplicate name "VID" problem on T61 */
2326 if (!strcmp(device->pnp.bus_id, "VID")) {
2327 if (instance)
2328 device->pnp.bus_id[3] = '0' + instance;
2329 instance ++;
2330 }
2331 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2332 if (!strcmp(device->pnp.bus_id, "VGA")) {
2333 if (instance)
2334 device->pnp.bus_id[3] = '0' + instance;
2335 instance++;
2336 }
2337
2338 video->device = device;
2339 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2340 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2341 device->driver_data = video;
2342
2343 acpi_video_bus_find_cap(video);
2344 error = acpi_video_bus_check(video);
2345 if (error)
2346 goto err_free_video;
2347
2348 error = acpi_video_bus_add_fs(device);
2349 if (error)
2350 goto err_free_video;
2351
2352 mutex_init(&video->device_list_lock);
2353 INIT_LIST_HEAD(&video->video_device_list);
2354
2355 acpi_video_bus_get_devices(video, device);
2356 acpi_video_bus_start_devices(video);
2357
2358 video->input = input = input_allocate_device();
2359 if (!input) {
2360 error = -ENOMEM;
2361 goto err_stop_video;
2362 }
2363
2364 snprintf(video->phys, sizeof(video->phys),
2365 "%s/video/input0", acpi_device_hid(video->device));
2366
2367 input->name = acpi_device_name(video->device);
2368 input->phys = video->phys;
2369 input->id.bustype = BUS_HOST;
2370 input->id.product = 0x06;
2371 input->dev.parent = &device->dev;
2372 input->evbit[0] = BIT(EV_KEY);
2373 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2374 set_bit(KEY_VIDEO_NEXT, input->keybit);
2375 set_bit(KEY_VIDEO_PREV, input->keybit);
2376 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2377 set_bit(KEY_BRIGHTNESSUP, input->keybit);
2378 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2379 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2380 set_bit(KEY_DISPLAY_OFF, input->keybit);
2381
2382 error = input_register_device(input);
2383 if (error)
2384 goto err_free_input_dev;
2385
2386 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
2387 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2388 video->flags.multihead ? "yes" : "no",
2389 video->flags.rom ? "yes" : "no",
2390 video->flags.post ? "yes" : "no");
2391
2392 video->pm_nb.notifier_call = acpi_video_resume;
2393 video->pm_nb.priority = 0;
2394 register_pm_notifier(&video->pm_nb);
2395
2396 return 0;
2397
2398 err_free_input_dev:
2399 input_free_device(input);
2400 err_stop_video:
2401 acpi_video_bus_stop_devices(video);
2402 acpi_video_bus_put_devices(video);
2403 kfree(video->attached_array);
2404 acpi_video_bus_remove_fs(device);
2405 err_free_video:
2406 kfree(video);
2407 device->driver_data = NULL;
2408
2409 return error;
2410 }
2411
2412 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2413 {
2414 struct acpi_video_bus *video = NULL;
2415
2416
2417 if (!device || !acpi_driver_data(device))
2418 return -EINVAL;
2419
2420 video = acpi_driver_data(device);
2421
2422 unregister_pm_notifier(&video->pm_nb);
2423
2424 acpi_video_bus_stop_devices(video);
2425 acpi_video_bus_put_devices(video);
2426 acpi_video_bus_remove_fs(device);
2427
2428 input_unregister_device(video->input);
2429 kfree(video->attached_array);
2430 kfree(video);
2431
2432 return 0;
2433 }
2434
2435 static int __init intel_opregion_present(void)
2436 {
2437 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
2438 struct pci_dev *dev = NULL;
2439 u32 address;
2440
2441 for_each_pci_dev(dev) {
2442 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2443 continue;
2444 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2445 continue;
2446 pci_read_config_dword(dev, 0xfc, &address);
2447 if (!address)
2448 continue;
2449 return 1;
2450 }
2451 #endif
2452 return 0;
2453 }
2454
2455 int acpi_video_register(void)
2456 {
2457 int result = 0;
2458 if (register_count) {
2459 /*
2460 * if the function of acpi_video_register is already called,
2461 * don't register the acpi_vide_bus again and return no error.
2462 */
2463 return 0;
2464 }
2465
2466 acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2467 if (!acpi_video_dir)
2468 return -ENODEV;
2469
2470 result = acpi_bus_register_driver(&acpi_video_bus);
2471 if (result < 0) {
2472 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2473 return -ENODEV;
2474 }
2475
2476 /*
2477 * When the acpi_video_bus is loaded successfully, increase
2478 * the counter reference.
2479 */
2480 register_count = 1;
2481
2482 return 0;
2483 }
2484 EXPORT_SYMBOL(acpi_video_register);
2485
2486 void acpi_video_unregister(void)
2487 {
2488 if (!register_count) {
2489 /*
2490 * If the acpi video bus is already unloaded, don't
2491 * unload it again and return directly.
2492 */
2493 return;
2494 }
2495 acpi_bus_unregister_driver(&acpi_video_bus);
2496
2497 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2498
2499 register_count = 0;
2500
2501 return;
2502 }
2503 EXPORT_SYMBOL(acpi_video_unregister);
2504
2505 /*
2506 * This is kind of nasty. Hardware using Intel chipsets may require
2507 * the video opregion code to be run first in order to initialise
2508 * state before any ACPI video calls are made. To handle this we defer
2509 * registration of the video class until the opregion code has run.
2510 */
2511
2512 static int __init acpi_video_init(void)
2513 {
2514 dmi_check_system(video_dmi_table);
2515
2516 if (intel_opregion_present())
2517 return 0;
2518
2519 return acpi_video_register();
2520 }
2521
2522 static void __exit acpi_video_exit(void)
2523 {
2524 acpi_video_unregister();
2525
2526 return;
2527 }
2528
2529 module_init(acpi_video_init);
2530 module_exit(acpi_video_exit);
Linux with added FPC-III support