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Linux 2.6.34-rc3
[pohmelfs.git] / drivers / acpi / video.c
blobcbe6f3924a102d327cb92511255c8df0d63329b1
1 /*
2 * video.c - ACPI Video Driver ($Revision:$)
3 *
4 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
5 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
6 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
7 *
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23 *
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 */
26
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/types.h>
31 #include <linux/list.h>
32 #include <linux/mutex.h>
33 #include <linux/proc_fs.h>
34 #include <linux/seq_file.h>
35 #include <linux/input.h>
36 #include <linux/backlight.h>
37 #include <linux/thermal.h>
38 #include <linux/video_output.h>
39 #include <linux/sort.h>
40 #include <linux/pci.h>
41 #include <linux/pci_ids.h>
42 #include <asm/uaccess.h>
43 #include <linux/dmi.h>
44 #include <acpi/acpi_bus.h>
45 #include <acpi/acpi_drivers.h>
46
47 #define PREFIX "ACPI: "
48
49 #define ACPI_VIDEO_CLASS "video"
50 #define ACPI_VIDEO_BUS_NAME "Video Bus"
51 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
52 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
53 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
54 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
55 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
56 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
57
58 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
59 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
60 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
61 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
62 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
63
64 #define MAX_NAME_LEN 20
65
66 #define ACPI_VIDEO_DISPLAY_CRT 1
67 #define ACPI_VIDEO_DISPLAY_TV 2
68 #define ACPI_VIDEO_DISPLAY_DVI 3
69 #define ACPI_VIDEO_DISPLAY_LCD 4
70
71 #define _COMPONENT ACPI_VIDEO_COMPONENT
72 ACPI_MODULE_NAME("video");
73
74 MODULE_AUTHOR("Bruno Ducrot");
75 MODULE_DESCRIPTION("ACPI Video Driver");
76 MODULE_LICENSE("GPL");
77
78 static int brightness_switch_enabled = 1;
79 module_param(brightness_switch_enabled, bool, 0644);
80
81 /*
82 * By default, we don't allow duplicate ACPI video bus devices
83 * under the same VGA controller
84 */
85 static int allow_duplicates;
86 module_param(allow_duplicates, bool, 0644);
87
88 static int register_count = 0;
89 static int acpi_video_bus_add(struct acpi_device *device);
90 static int acpi_video_bus_remove(struct acpi_device *device, int type);
91 static int acpi_video_resume(struct acpi_device *device);
92 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
93
94 static const struct acpi_device_id video_device_ids[] = {
95 {ACPI_VIDEO_HID, 0},
96 {"", 0},
97 };
98 MODULE_DEVICE_TABLE(acpi, video_device_ids);
99
100 static struct acpi_driver acpi_video_bus = {
101 .name = "video",
102 .class = ACPI_VIDEO_CLASS,
103 .ids = video_device_ids,
104 .ops = {
105 .add = acpi_video_bus_add,
106 .remove = acpi_video_bus_remove,
107 .resume = acpi_video_resume,
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 };
163
164 struct acpi_video_device_flags {
165 u8 crt:1;
166 u8 lcd:1;
167 u8 tvout:1;
168 u8 dvi:1;
169 u8 bios:1;
170 u8 unknown:1;
171 u8 reserved:2;
172 };
173
174 struct acpi_video_device_cap {
175 u8 _ADR:1; /*Return the unique ID */
176 u8 _BCL:1; /*Query list of brightness control levels supported */
177 u8 _BCM:1; /*Set the brightness level */
178 u8 _BQC:1; /* Get current brightness level */
179 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
180 u8 _DDC:1; /*Return the EDID for this device */
181 u8 _DCS:1; /*Return status of output device */
182 u8 _DGS:1; /*Query graphics state */
183 u8 _DSS:1; /*Device state set */
184 };
185
186 struct acpi_video_brightness_flags {
187 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
188 u8 _BCL_reversed:1; /* _BCL package is in a reversed order*/
189 u8 _BCL_use_index:1; /* levels in _BCL are index values */
190 u8 _BCM_use_index:1; /* input of _BCM is an index value */
191 u8 _BQC_use_index:1; /* _BQC returns an index value */
192 };
193
194 struct acpi_video_device_brightness {
195 int curr;
196 int count;
197 int *levels;
198 struct acpi_video_brightness_flags flags;
199 };
200
201 struct acpi_video_device {
202 unsigned long device_id;
203 struct acpi_video_device_flags flags;
204 struct acpi_video_device_cap cap;
205 struct list_head entry;
206 struct acpi_video_bus *video;
207 struct acpi_device *dev;
208 struct acpi_video_device_brightness *brightness;
209 struct backlight_device *backlight;
210 struct thermal_cooling_device *cooling_dev;
211 struct output_device *output_dev;
212 };
213
214 /* bus */
215 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
216 static const struct file_operations acpi_video_bus_info_fops = {
217 .owner = THIS_MODULE,
218 .open = acpi_video_bus_info_open_fs,
219 .read = seq_read,
220 .llseek = seq_lseek,
221 .release = single_release,
222 };
223
224 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
225 static const struct file_operations acpi_video_bus_ROM_fops = {
226 .owner = THIS_MODULE,
227 .open = acpi_video_bus_ROM_open_fs,
228 .read = seq_read,
229 .llseek = seq_lseek,
230 .release = single_release,
231 };
232
233 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
234 struct file *file);
235 static const struct file_operations acpi_video_bus_POST_info_fops = {
236 .owner = THIS_MODULE,
237 .open = acpi_video_bus_POST_info_open_fs,
238 .read = seq_read,
239 .llseek = seq_lseek,
240 .release = single_release,
241 };
242
243 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
244 static ssize_t acpi_video_bus_write_POST(struct file *file,
245 const char __user *buffer, size_t count, loff_t *data);
246 static const struct file_operations acpi_video_bus_POST_fops = {
247 .owner = THIS_MODULE,
248 .open = acpi_video_bus_POST_open_fs,
249 .read = seq_read,
250 .write = acpi_video_bus_write_POST,
251 .llseek = seq_lseek,
252 .release = single_release,
253 };
254
255 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
256 static ssize_t acpi_video_bus_write_DOS(struct file *file,
257 const char __user *buffer, size_t count, loff_t *data);
258 static const struct file_operations acpi_video_bus_DOS_fops = {
259 .owner = THIS_MODULE,
260 .open = acpi_video_bus_DOS_open_fs,
261 .read = seq_read,
262 .write = acpi_video_bus_write_DOS,
263 .llseek = seq_lseek,
264 .release = single_release,
265 };
266
267 /* device */
268 static int acpi_video_device_info_open_fs(struct inode *inode,
269 struct file *file);
270 static const struct file_operations acpi_video_device_info_fops = {
271 .owner = THIS_MODULE,
272 .open = acpi_video_device_info_open_fs,
273 .read = seq_read,
274 .llseek = seq_lseek,
275 .release = single_release,
276 };
277
278 static int acpi_video_device_state_open_fs(struct inode *inode,
279 struct file *file);
280 static ssize_t acpi_video_device_write_state(struct file *file,
281 const char __user *buffer, size_t count, loff_t *data);
282 static const struct file_operations acpi_video_device_state_fops = {
283 .owner = THIS_MODULE,
284 .open = acpi_video_device_state_open_fs,
285 .read = seq_read,
286 .write = acpi_video_device_write_state,
287 .llseek = seq_lseek,
288 .release = single_release,
289 };
290
291 static int acpi_video_device_brightness_open_fs(struct inode *inode,
292 struct file *file);
293 static ssize_t acpi_video_device_write_brightness(struct file *file,
294 const char __user *buffer, size_t count, loff_t *data);
295 static const struct file_operations acpi_video_device_brightness_fops = {
296 .owner = THIS_MODULE,
297 .open = acpi_video_device_brightness_open_fs,
298 .read = seq_read,
299 .write = acpi_video_device_write_brightness,
300 .llseek = seq_lseek,
301 .release = single_release,
302 };
303
304 static int acpi_video_device_EDID_open_fs(struct inode *inode,
305 struct file *file);
306 static const struct file_operations acpi_video_device_EDID_fops = {
307 .owner = THIS_MODULE,
308 .open = acpi_video_device_EDID_open_fs,
309 .read = seq_read,
310 .llseek = seq_lseek,
311 .release = single_release,
312 };
313
314 static const char device_decode[][30] = {
315 "motherboard VGA device",
316 "PCI VGA device",
317 "AGP VGA device",
318 "UNKNOWN",
319 };
320
321 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
322 static void acpi_video_device_rebind(struct acpi_video_bus *video);
323 static void acpi_video_device_bind(struct acpi_video_bus *video,
324 struct acpi_video_device *device);
325 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
326 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
327 int level);
328 static int acpi_video_device_lcd_get_level_current(
329 struct acpi_video_device *device,
330 unsigned long long *level, int init);
331 static int acpi_video_get_next_level(struct acpi_video_device *device,
332 u32 level_current, u32 event);
333 static int acpi_video_switch_brightness(struct acpi_video_device *device,
334 int event);
335 static int acpi_video_device_get_state(struct acpi_video_device *device,
336 unsigned long long *state);
337 static int acpi_video_output_get(struct output_device *od);
338 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
339
340 /*backlight device sysfs support*/
341 static int acpi_video_get_brightness(struct backlight_device *bd)
342 {
343 unsigned long long cur_level;
344 int i;
345 struct acpi_video_device *vd =
346 (struct acpi_video_device *)bl_get_data(bd);
347
348 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, 0))
349 return -EINVAL;
350 for (i = 2; i < vd->brightness->count; i++) {
351 if (vd->brightness->levels[i] == cur_level)
352 /* The first two entries are special - see page 575
353 of the ACPI spec 3.0 */
354 return i-2;
355 }
356 return 0;
357 }
358
359 static int acpi_video_set_brightness(struct backlight_device *bd)
360 {
361 int request_level = bd->props.brightness + 2;
362 struct acpi_video_device *vd =
363 (struct acpi_video_device *)bl_get_data(bd);
364
365 return acpi_video_device_lcd_set_level(vd,
366 vd->brightness->levels[request_level]);
367 }
368
369 static struct backlight_ops acpi_backlight_ops = {
370 .get_brightness = acpi_video_get_brightness,
371 .update_status = acpi_video_set_brightness,
372 };
373
374 /*video output device sysfs support*/
375 static int acpi_video_output_get(struct output_device *od)
376 {
377 unsigned long long state;
378 struct acpi_video_device *vd =
379 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
380 acpi_video_device_get_state(vd, &state);
381 return (int)state;
382 }
383
384 static int acpi_video_output_set(struct output_device *od)
385 {
386 unsigned long state = od->request_state;
387 struct acpi_video_device *vd=
388 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
389 return acpi_video_device_set_state(vd, state);
390 }
391
392 static struct output_properties acpi_output_properties = {
393 .set_state = acpi_video_output_set,
394 .get_status = acpi_video_output_get,
395 };
396
397
398 /* thermal cooling device callbacks */
399 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
400 long *state)
401 {
402 struct acpi_device *device = cooling_dev->devdata;
403 struct acpi_video_device *video = acpi_driver_data(device);
404
405 *state = video->brightness->count - 3;
406 return 0;
407 }
408
409 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
410 long *state)
411 {
412 struct acpi_device *device = cooling_dev->devdata;
413 struct acpi_video_device *video = acpi_driver_data(device);
414 unsigned long long level;
415 int offset;
416
417 if (acpi_video_device_lcd_get_level_current(video, &level, 0))
418 return -EINVAL;
419 for (offset = 2; offset < video->brightness->count; offset++)
420 if (level == video->brightness->levels[offset]) {
421 *state = video->brightness->count - offset - 1;
422 return 0;
423 }
424
425 return -EINVAL;
426 }
427
428 static int
429 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
430 {
431 struct acpi_device *device = cooling_dev->devdata;
432 struct acpi_video_device *video = acpi_driver_data(device);
433 int level;
434
435 if ( state >= video->brightness->count - 2)
436 return -EINVAL;
437
438 state = video->brightness->count - state;
439 level = video->brightness->levels[state -1];
440 return acpi_video_device_lcd_set_level(video, level);
441 }
442
443 static struct thermal_cooling_device_ops video_cooling_ops = {
444 .get_max_state = video_get_max_state,
445 .get_cur_state = video_get_cur_state,
446 .set_cur_state = video_set_cur_state,
447 };
448
449 /* --------------------------------------------------------------------------
450 Video Management
451 -------------------------------------------------------------------------- */
452
453 /* device */
454
455 static int
456 acpi_video_device_query(struct acpi_video_device *device, unsigned long long *state)
457 {
458 int status;
459
460 status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
461
462 return status;
463 }
464
465 static int
466 acpi_video_device_get_state(struct acpi_video_device *device,
467 unsigned long long *state)
468 {
469 int status;
470
471 status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
472
473 return status;
474 }
475
476 static int
477 acpi_video_device_set_state(struct acpi_video_device *device, int state)
478 {
479 int status;
480 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
481 struct acpi_object_list args = { 1, &arg0 };
482 unsigned long long ret;
483
484
485 arg0.integer.value = state;
486 status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
487
488 return status;
489 }
490
491 static int
492 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
493 union acpi_object **levels)
494 {
495 int status;
496 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
497 union acpi_object *obj;
498
499
500 *levels = NULL;
501
502 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
503 if (!ACPI_SUCCESS(status))
504 return status;
505 obj = (union acpi_object *)buffer.pointer;
506 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
507 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
508 status = -EFAULT;
509 goto err;
510 }
511
512 *levels = obj;
513
514 return 0;
515
516 err:
517 kfree(buffer.pointer);
518
519 return status;
520 }
521
522 static int
523 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
524 {
525 int status;
526 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
527 struct acpi_object_list args = { 1, &arg0 };
528 int state;
529
530 arg0.integer.value = level;
531
532 status = acpi_evaluate_object(device->dev->handle, "_BCM",
533 &args, NULL);
534 if (ACPI_FAILURE(status)) {
535 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
536 return -EIO;
537 }
538
539 device->brightness->curr = level;
540 for (state = 2; state < device->brightness->count; state++)
541 if (level == device->brightness->levels[state]) {
542 if (device->backlight)
543 device->backlight->props.brightness = state - 2;
544 return 0;
545 }
546
547 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
548 return -EINVAL;
549 }
550
551 /*
552 * For some buggy _BQC methods, we need to add a constant value to
553 * the _BQC return value to get the actual current brightness level
554 */
555
556 static int bqc_offset_aml_bug_workaround;
557 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
558 {
559 bqc_offset_aml_bug_workaround = 9;
560 return 0;
561 }
562
563 static struct dmi_system_id video_dmi_table[] __initdata = {
564 /*
565 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
566 */
567 {
568 .callback = video_set_bqc_offset,
569 .ident = "Acer Aspire 5720",
570 .matches = {
571 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
572 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
573 },
574 },
575 {
576 .callback = video_set_bqc_offset,
577 .ident = "Acer Aspire 5710Z",
578 .matches = {
579 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
580 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
581 },
582 },
583 {
584 .callback = video_set_bqc_offset,
585 .ident = "eMachines E510",
586 .matches = {
587 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
588 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
589 },
590 },
591 {
592 .callback = video_set_bqc_offset,
593 .ident = "Acer Aspire 5315",
594 .matches = {
595 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
596 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
597 },
598 },
599 {
600 .callback = video_set_bqc_offset,
601 .ident = "Acer Aspire 7720",
602 .matches = {
603 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
604 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
605 },
606 },
607 {}
608 };
609
610 static int
611 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
612 unsigned long long *level, int init)
613 {
614 acpi_status status = AE_OK;
615 int i;
616
617 if (device->cap._BQC || device->cap._BCQ) {
618 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
619
620 status = acpi_evaluate_integer(device->dev->handle, buf,
621 NULL, level);
622 if (ACPI_SUCCESS(status)) {
623 if (device->brightness->flags._BQC_use_index) {
624 if (device->brightness->flags._BCL_reversed)
625 *level = device->brightness->count
626 - 3 - (*level);
627 *level = device->brightness->levels[*level + 2];
628
629 }
630 *level += bqc_offset_aml_bug_workaround;
631 for (i = 2; i < device->brightness->count; i++)
632 if (device->brightness->levels[i] == *level) {
633 device->brightness->curr = *level;
634 return 0;
635 }
636 if (!init) {
637 /*
638 * BQC returned an invalid level.
639 * Stop using it.
640 */
641 ACPI_WARNING((AE_INFO,
642 "%s returned an invalid level",
643 buf));
644 device->cap._BQC = device->cap._BCQ = 0;
645 }
646 } else {
647 /* Fixme:
648 * should we return an error or ignore this failure?
649 * dev->brightness->curr is a cached value which stores
650 * the correct current backlight level in most cases.
651 * ACPI video backlight still works w/ buggy _BQC.
652 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
653 */
654 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
655 device->cap._BQC = device->cap._BCQ = 0;
656 }
657 }
658
659 *level = device->brightness->curr;
660 return 0;
661 }
662
663 static int
664 acpi_video_device_EDID(struct acpi_video_device *device,
665 union acpi_object **edid, ssize_t length)
666 {
667 int status;
668 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
669 union acpi_object *obj;
670 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
671 struct acpi_object_list args = { 1, &arg0 };
672
673
674 *edid = NULL;
675
676 if (!device)
677 return -ENODEV;
678 if (length == 128)
679 arg0.integer.value = 1;
680 else if (length == 256)
681 arg0.integer.value = 2;
682 else
683 return -EINVAL;
684
685 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
686 if (ACPI_FAILURE(status))
687 return -ENODEV;
688
689 obj = buffer.pointer;
690
691 if (obj && obj->type == ACPI_TYPE_BUFFER)
692 *edid = obj;
693 else {
694 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
695 status = -EFAULT;
696 kfree(obj);
697 }
698
699 return status;
700 }
701
702 /* bus */
703
704 static int
705 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
706 {
707 int status;
708 unsigned long long tmp;
709 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
710 struct acpi_object_list args = { 1, &arg0 };
711
712
713 arg0.integer.value = option;
714
715 status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
716 if (ACPI_SUCCESS(status))
717 status = tmp ? (-EINVAL) : (AE_OK);
718
719 return status;
720 }
721
722 static int
723 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long long *id)
724 {
725 int status;
726
727 status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
728
729 return status;
730 }
731
732 static int
733 acpi_video_bus_POST_options(struct acpi_video_bus *video,
734 unsigned long long *options)
735 {
736 int status;
737
738 status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
739 *options &= 3;
740
741 return status;
742 }
743
744 /*
745 * Arg:
746 * video : video bus device pointer
747 * bios_flag :
748 * 0. The system BIOS should NOT automatically switch(toggle)
749 * the active display output.
750 * 1. The system BIOS should automatically switch (toggle) the
751 * active display output. No switch event.
752 * 2. The _DGS value should be locked.
753 * 3. The system BIOS should not automatically switch (toggle) the
754 * active display output, but instead generate the display switch
755 * event notify code.
756 * lcd_flag :
757 * 0. The system BIOS should automatically control the brightness level
758 * of the LCD when the power changes from AC to DC
759 * 1. The system BIOS should NOT automatically control the brightness
760 * level of the LCD when the power changes from AC to DC.
761 * Return Value:
762 * -1 wrong arg.
763 */
764
765 static int
766 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
767 {
768 u64 status = 0;
769 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
770 struct acpi_object_list args = { 1, &arg0 };
771
772
773 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
774 status = -1;
775 goto Failed;
776 }
777 arg0.integer.value = (lcd_flag << 2) | bios_flag;
778 video->dos_setting = arg0.integer.value;
779 acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
780
781 Failed:
782 return status;
783 }
784
785 /*
786 * Simple comparison function used to sort backlight levels.
787 */
788
789 static int
790 acpi_video_cmp_level(const void *a, const void *b)
791 {
792 return *(int *)a - *(int *)b;
793 }
794
795 /*
796 * Arg:
797 * device : video output device (LCD, CRT, ..)
798 *
799 * Return Value:
800 * Maximum brightness level
801 *
802 * Allocate and initialize device->brightness.
803 */
804
805 static int
806 acpi_video_init_brightness(struct acpi_video_device *device)
807 {
808 union acpi_object *obj = NULL;
809 int i, max_level = 0, count = 0, level_ac_battery = 0;
810 unsigned long long level, level_old;
811 union acpi_object *o;
812 struct acpi_video_device_brightness *br = NULL;
813 int result = -EINVAL;
814
815 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
816 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
817 "LCD brightness level\n"));
818 goto out;
819 }
820
821 if (obj->package.count < 2)
822 goto out;
823
824 br = kzalloc(sizeof(*br), GFP_KERNEL);
825 if (!br) {
826 printk(KERN_ERR "can't allocate memory\n");
827 result = -ENOMEM;
828 goto out;
829 }
830
831 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
832 GFP_KERNEL);
833 if (!br->levels) {
834 result = -ENOMEM;
835 goto out_free;
836 }
837
838 for (i = 0; i < obj->package.count; i++) {
839 o = (union acpi_object *)&obj->package.elements[i];
840 if (o->type != ACPI_TYPE_INTEGER) {
841 printk(KERN_ERR PREFIX "Invalid data\n");
842 continue;
843 }
844 br->levels[count] = (u32) o->integer.value;
845
846 if (br->levels[count] > max_level)
847 max_level = br->levels[count];
848 count++;
849 }
850
851 /*
852 * some buggy BIOS don't export the levels
853 * when machine is on AC/Battery in _BCL package.
854 * In this case, the first two elements in _BCL packages
855 * are also supported brightness levels that OS should take care of.
856 */
857 for (i = 2; i < count; i++) {
858 if (br->levels[i] == br->levels[0])
859 level_ac_battery++;
860 if (br->levels[i] == br->levels[1])
861 level_ac_battery++;
862 }
863
864 if (level_ac_battery < 2) {
865 level_ac_battery = 2 - level_ac_battery;
866 br->flags._BCL_no_ac_battery_levels = 1;
867 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
868 br->levels[i] = br->levels[i - level_ac_battery];
869 count += level_ac_battery;
870 } else if (level_ac_battery > 2)
871 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
872
873 /* Check if the _BCL package is in a reversed order */
874 if (max_level == br->levels[2]) {
875 br->flags._BCL_reversed = 1;
876 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
877 acpi_video_cmp_level, NULL);
878 } else if (max_level != br->levels[count - 1])
879 ACPI_ERROR((AE_INFO,
880 "Found unordered _BCL package\n"));
881
882 br->count = count;
883 device->brightness = br;
884
885 /* Check the input/output of _BQC/_BCL/_BCM */
886 if ((max_level < 100) && (max_level <= (count - 2)))
887 br->flags._BCL_use_index = 1;
888
889 /*
890 * _BCM is always consistent with _BCL,
891 * at least for all the laptops we have ever seen.
892 */
893 br->flags._BCM_use_index = br->flags._BCL_use_index;
894
895 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
896 br->curr = level = max_level;
897
898 if (!device->cap._BQC)
899 goto set_level;
900
901 result = acpi_video_device_lcd_get_level_current(device, &level_old, 1);
902 if (result)
903 goto out_free_levels;
904
905 /*
906 * Set the level to maximum and check if _BQC uses indexed value
907 */
908 result = acpi_video_device_lcd_set_level(device, max_level);
909 if (result)
910 goto out_free_levels;
911
912 result = acpi_video_device_lcd_get_level_current(device, &level, 0);
913 if (result)
914 goto out_free_levels;
915
916 br->flags._BQC_use_index = (level == max_level ? 0 : 1);
917
918 if (!br->flags._BQC_use_index) {
919 /*
920 * Set the backlight to the initial state.
921 * On some buggy laptops, _BQC returns an uninitialized value
922 * when invoked for the first time, i.e. level_old is invalid.
923 * set the backlight to max_level in this case
924 */
925 for (i = 2; i < br->count; i++)
926 if (level_old == br->levels[i])
927 level = level_old;
928 goto set_level;
929 }
930
931 if (br->flags._BCL_reversed)
932 level_old = (br->count - 1) - level_old;
933 level = br->levels[level_old];
934
935 set_level:
936 result = acpi_video_device_lcd_set_level(device, level);
937 if (result)
938 goto out_free_levels;
939
940 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
941 "found %d brightness levels\n", count - 2));
942 kfree(obj);
943 return result;
944
945 out_free_levels:
946 kfree(br->levels);
947 out_free:
948 kfree(br);
949 out:
950 device->brightness = NULL;
951 kfree(obj);
952 return result;
953 }
954
955 /*
956 * Arg:
957 * device : video output device (LCD, CRT, ..)
958 *
959 * Return Value:
960 * None
961 *
962 * Find out all required AML methods defined under the output
963 * device.
964 */
965
966 static void acpi_video_device_find_cap(struct acpi_video_device *device)
967 {
968 acpi_handle h_dummy1;
969
970 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
971 device->cap._ADR = 1;
972 }
973 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
974 device->cap._BCL = 1;
975 }
976 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
977 device->cap._BCM = 1;
978 }
979 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
980 device->cap._BQC = 1;
981 else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
982 &h_dummy1))) {
983 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
984 device->cap._BCQ = 1;
985 }
986
987 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
988 device->cap._DDC = 1;
989 }
990 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
991 device->cap._DCS = 1;
992 }
993 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
994 device->cap._DGS = 1;
995 }
996 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
997 device->cap._DSS = 1;
998 }
999
1000 if (acpi_video_backlight_support()) {
1001 struct backlight_properties props;
1002 int result;
1003 static int count = 0;
1004 char *name;
1005
1006 result = acpi_video_init_brightness(device);
1007 if (result)
1008 return;
1009 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
1010 if (!name)
1011 return;
1012
1013 sprintf(name, "acpi_video%d", count++);
1014 memset(&props, 0, sizeof(struct backlight_properties));
1015 props.max_brightness = device->brightness->count - 3;
1016 device->backlight = backlight_device_register(name, NULL, device,
1017 &acpi_backlight_ops,
1018 &props);
1019 kfree(name);
1020 if (IS_ERR(device->backlight))
1021 return;
1022
1023 result = sysfs_create_link(&device->backlight->dev.kobj,
1024 &device->dev->dev.kobj, "device");
1025 if (result)
1026 printk(KERN_ERR PREFIX "Create sysfs link\n");
1027
1028 device->cooling_dev = thermal_cooling_device_register("LCD",
1029 device->dev, &video_cooling_ops);
1030 if (IS_ERR(device->cooling_dev)) {
1031 /*
1032 * Set cooling_dev to NULL so we don't crash trying to
1033 * free it.
1034 * Also, why the hell we are returning early and
1035 * not attempt to register video output if cooling
1036 * device registration failed?
1037 * -- dtor
1038 */
1039 device->cooling_dev = NULL;
1040 return;
1041 }
1042
1043 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1044 device->cooling_dev->id);
1045 result = sysfs_create_link(&device->dev->dev.kobj,
1046 &device->cooling_dev->device.kobj,
1047 "thermal_cooling");
1048 if (result)
1049 printk(KERN_ERR PREFIX "Create sysfs link\n");
1050 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1051 &device->dev->dev.kobj, "device");
1052 if (result)
1053 printk(KERN_ERR PREFIX "Create sysfs link\n");
1054
1055 }
1056
1057 if (acpi_video_display_switch_support()) {
1058
1059 if (device->cap._DCS && device->cap._DSS) {
1060 static int count;
1061 char *name;
1062 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
1063 if (!name)
1064 return;
1065 sprintf(name, "acpi_video%d", count++);
1066 device->output_dev = video_output_register(name,
1067 NULL, device, &acpi_output_properties);
1068 kfree(name);
1069 }
1070 }
1071 }
1072
1073 /*
1074 * Arg:
1075 * device : video output device (VGA)
1076 *
1077 * Return Value:
1078 * None
1079 *
1080 * Find out all required AML methods defined under the video bus device.
1081 */
1082
1083 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1084 {
1085 acpi_handle h_dummy1;
1086
1087 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
1088 video->cap._DOS = 1;
1089 }
1090 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
1091 video->cap._DOD = 1;
1092 }
1093 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
1094 video->cap._ROM = 1;
1095 }
1096 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
1097 video->cap._GPD = 1;
1098 }
1099 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
1100 video->cap._SPD = 1;
1101 }
1102 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
1103 video->cap._VPO = 1;
1104 }
1105 }
1106
1107 /*
1108 * Check whether the video bus device has required AML method to
1109 * support the desired features
1110 */
1111
1112 static int acpi_video_bus_check(struct acpi_video_bus *video)
1113 {
1114 acpi_status status = -ENOENT;
1115 struct pci_dev *dev;
1116
1117 if (!video)
1118 return -EINVAL;
1119
1120 dev = acpi_get_pci_dev(video->device->handle);
1121 if (!dev)
1122 return -ENODEV;
1123 pci_dev_put(dev);
1124
1125 /* Since there is no HID, CID and so on for VGA driver, we have
1126 * to check well known required nodes.
1127 */
1128
1129 /* Does this device support video switching? */
1130 if (video->cap._DOS || video->cap._DOD) {
1131 if (!video->cap._DOS) {
1132 printk(KERN_WARNING FW_BUG
1133 "ACPI(%s) defines _DOD but not _DOS\n",
1134 acpi_device_bid(video->device));
1135 }
1136 video->flags.multihead = 1;
1137 status = 0;
1138 }
1139
1140 /* Does this device support retrieving a video ROM? */
1141 if (video->cap._ROM) {
1142 video->flags.rom = 1;
1143 status = 0;
1144 }
1145
1146 /* Does this device support configuring which video device to POST? */
1147 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1148 video->flags.post = 1;
1149 status = 0;
1150 }
1151
1152 return status;
1153 }
1154
1155 /* --------------------------------------------------------------------------
1156 FS Interface (/proc)
1157 -------------------------------------------------------------------------- */
1158
1159 static struct proc_dir_entry *acpi_video_dir;
1160
1161 /* video devices */
1162
1163 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
1164 {
1165 struct acpi_video_device *dev = seq->private;
1166
1167
1168 if (!dev)
1169 goto end;
1170
1171 seq_printf(seq, "device_id: 0x%04x\n", (u32) dev->device_id);
1172 seq_printf(seq, "type: ");
1173 if (dev->flags.crt)
1174 seq_printf(seq, "CRT\n");
1175 else if (dev->flags.lcd)
1176 seq_printf(seq, "LCD\n");
1177 else if (dev->flags.tvout)
1178 seq_printf(seq, "TVOUT\n");
1179 else if (dev->flags.dvi)
1180 seq_printf(seq, "DVI\n");
1181 else
1182 seq_printf(seq, "UNKNOWN\n");
1183
1184 seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
1185
1186 end:
1187 return 0;
1188 }
1189
1190 static int
1191 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
1192 {
1193 return single_open(file, acpi_video_device_info_seq_show,
1194 PDE(inode)->data);
1195 }
1196
1197 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
1198 {
1199 int status;
1200 struct acpi_video_device *dev = seq->private;
1201 unsigned long long state;
1202
1203
1204 if (!dev)
1205 goto end;
1206
1207 status = acpi_video_device_get_state(dev, &state);
1208 seq_printf(seq, "state: ");
1209 if (ACPI_SUCCESS(status))
1210 seq_printf(seq, "0x%02llx\n", state);
1211 else
1212 seq_printf(seq, "<not supported>\n");
1213
1214 status = acpi_video_device_query(dev, &state);
1215 seq_printf(seq, "query: ");
1216 if (ACPI_SUCCESS(status))
1217 seq_printf(seq, "0x%02llx\n", state);
1218 else
1219 seq_printf(seq, "<not supported>\n");
1220
1221 end:
1222 return 0;
1223 }
1224
1225 static int
1226 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
1227 {
1228 return single_open(file, acpi_video_device_state_seq_show,
1229 PDE(inode)->data);
1230 }
1231
1232 static ssize_t
1233 acpi_video_device_write_state(struct file *file,
1234 const char __user * buffer,
1235 size_t count, loff_t * data)
1236 {
1237 int status;
1238 struct seq_file *m = file->private_data;
1239 struct acpi_video_device *dev = m->private;
1240 char str[12] = { 0 };
1241 u32 state = 0;
1242
1243
1244 if (!dev || count >= sizeof(str))
1245 return -EINVAL;
1246
1247 if (copy_from_user(str, buffer, count))
1248 return -EFAULT;
1249
1250 str[count] = 0;
1251 state = simple_strtoul(str, NULL, 0);
1252 state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
1253
1254 status = acpi_video_device_set_state(dev, state);
1255
1256 if (status)
1257 return -EFAULT;
1258
1259 return count;
1260 }
1261
1262 static int
1263 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
1264 {
1265 struct acpi_video_device *dev = seq->private;
1266 int i;
1267
1268
1269 if (!dev || !dev->brightness) {
1270 seq_printf(seq, "<not supported>\n");
1271 return 0;
1272 }
1273
1274 seq_printf(seq, "levels: ");
1275 for (i = 2; i < dev->brightness->count; i++)
1276 seq_printf(seq, " %d", dev->brightness->levels[i]);
1277 seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
1278
1279 return 0;
1280 }
1281
1282 static int
1283 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1284 {
1285 return single_open(file, acpi_video_device_brightness_seq_show,
1286 PDE(inode)->data);
1287 }
1288
1289 static ssize_t
1290 acpi_video_device_write_brightness(struct file *file,
1291 const char __user * buffer,
1292 size_t count, loff_t * data)
1293 {
1294 struct seq_file *m = file->private_data;
1295 struct acpi_video_device *dev = m->private;
1296 char str[5] = { 0 };
1297 unsigned int level = 0;
1298 int i;
1299
1300
1301 if (!dev || !dev->brightness || count >= sizeof(str))
1302 return -EINVAL;
1303
1304 if (copy_from_user(str, buffer, count))
1305 return -EFAULT;
1306
1307 str[count] = 0;
1308 level = simple_strtoul(str, NULL, 0);
1309
1310 if (level > 100)
1311 return -EFAULT;
1312
1313 /* validate through the list of available levels */
1314 for (i = 2; i < dev->brightness->count; i++)
1315 if (level == dev->brightness->levels[i]) {
1316 if (!acpi_video_device_lcd_set_level(dev, level))
1317 return count;
1318 break;
1319 }
1320
1321 return -EINVAL;
1322 }
1323
1324 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1325 {
1326 struct acpi_video_device *dev = seq->private;
1327 int status;
1328 int i;
1329 union acpi_object *edid = NULL;
1330
1331
1332 if (!dev)
1333 goto out;
1334
1335 status = acpi_video_device_EDID(dev, &edid, 128);
1336 if (ACPI_FAILURE(status)) {
1337 status = acpi_video_device_EDID(dev, &edid, 256);
1338 }
1339
1340 if (ACPI_FAILURE(status)) {
1341 goto out;
1342 }
1343
1344 if (edid && edid->type == ACPI_TYPE_BUFFER) {
1345 for (i = 0; i < edid->buffer.length; i++)
1346 seq_putc(seq, edid->buffer.pointer[i]);
1347 }
1348
1349 out:
1350 if (!edid)
1351 seq_printf(seq, "<not supported>\n");
1352 else
1353 kfree(edid);
1354
1355 return 0;
1356 }
1357
1358 static int
1359 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1360 {
1361 return single_open(file, acpi_video_device_EDID_seq_show,
1362 PDE(inode)->data);
1363 }
1364
1365 static int acpi_video_device_add_fs(struct acpi_device *device)
1366 {
1367 struct proc_dir_entry *entry, *device_dir;
1368 struct acpi_video_device *vid_dev;
1369
1370 vid_dev = acpi_driver_data(device);
1371 if (!vid_dev)
1372 return -ENODEV;
1373
1374 device_dir = proc_mkdir(acpi_device_bid(device),
1375 vid_dev->video->dir);
1376 if (!device_dir)
1377 return -ENOMEM;
1378
1379 /* 'info' [R] */
1380 entry = proc_create_data("info", S_IRUGO, device_dir,
1381 &acpi_video_device_info_fops, acpi_driver_data(device));
1382 if (!entry)
1383 goto err_remove_dir;
1384
1385 /* 'state' [R/W] */
1386 entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1387 device_dir,
1388 &acpi_video_device_state_fops,
1389 acpi_driver_data(device));
1390 if (!entry)
1391 goto err_remove_info;
1392
1393 /* 'brightness' [R/W] */
1394 entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1395 device_dir,
1396 &acpi_video_device_brightness_fops,
1397 acpi_driver_data(device));
1398 if (!entry)
1399 goto err_remove_state;
1400
1401 /* 'EDID' [R] */
1402 entry = proc_create_data("EDID", S_IRUGO, device_dir,
1403 &acpi_video_device_EDID_fops,
1404 acpi_driver_data(device));
1405 if (!entry)
1406 goto err_remove_brightness;
1407
1408 acpi_device_dir(device) = device_dir;
1409
1410 return 0;
1411
1412 err_remove_brightness:
1413 remove_proc_entry("brightness", device_dir);
1414 err_remove_state:
1415 remove_proc_entry("state", device_dir);
1416 err_remove_info:
1417 remove_proc_entry("info", device_dir);
1418 err_remove_dir:
1419 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1420 return -ENOMEM;
1421 }
1422
1423 static int acpi_video_device_remove_fs(struct acpi_device *device)
1424 {
1425 struct acpi_video_device *vid_dev;
1426 struct proc_dir_entry *device_dir;
1427
1428 vid_dev = acpi_driver_data(device);
1429 if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1430 return -ENODEV;
1431
1432 device_dir = acpi_device_dir(device);
1433 if (device_dir) {
1434 remove_proc_entry("info", device_dir);
1435 remove_proc_entry("state", device_dir);
1436 remove_proc_entry("brightness", device_dir);
1437 remove_proc_entry("EDID", device_dir);
1438 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1439 acpi_device_dir(device) = NULL;
1440 }
1441
1442 return 0;
1443 }
1444
1445 /* video bus */
1446 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1447 {
1448 struct acpi_video_bus *video = seq->private;
1449
1450
1451 if (!video)
1452 goto end;
1453
1454 seq_printf(seq, "Switching heads: %s\n",
1455 video->flags.multihead ? "yes" : "no");
1456 seq_printf(seq, "Video ROM: %s\n",
1457 video->flags.rom ? "yes" : "no");
1458 seq_printf(seq, "Device to be POSTed on boot: %s\n",
1459 video->flags.post ? "yes" : "no");
1460
1461 end:
1462 return 0;
1463 }
1464
1465 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1466 {
1467 return single_open(file, acpi_video_bus_info_seq_show,
1468 PDE(inode)->data);
1469 }
1470
1471 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1472 {
1473 struct acpi_video_bus *video = seq->private;
1474
1475
1476 if (!video)
1477 goto end;
1478
1479 printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1480 seq_printf(seq, "<TODO>\n");
1481
1482 end:
1483 return 0;
1484 }
1485
1486 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1487 {
1488 return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1489 }
1490
1491 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1492 {
1493 struct acpi_video_bus *video = seq->private;
1494 unsigned long long options;
1495 int status;
1496
1497
1498 if (!video)
1499 goto end;
1500
1501 status = acpi_video_bus_POST_options(video, &options);
1502 if (ACPI_SUCCESS(status)) {
1503 if (!(options & 1)) {
1504 printk(KERN_WARNING PREFIX
1505 "The motherboard VGA device is not listed as a possible POST device.\n");
1506 printk(KERN_WARNING PREFIX
1507 "This indicates a BIOS bug. Please contact the manufacturer.\n");
1508 }
1509 printk(KERN_WARNING "%llx\n", options);
1510 seq_printf(seq, "can POST: <integrated video>");
1511 if (options & 2)
1512 seq_printf(seq, " <PCI video>");
1513 if (options & 4)
1514 seq_printf(seq, " <AGP video>");
1515 seq_putc(seq, '\n');
1516 } else
1517 seq_printf(seq, "<not supported>\n");
1518 end:
1519 return 0;
1520 }
1521
1522 static int
1523 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1524 {
1525 return single_open(file, acpi_video_bus_POST_info_seq_show,
1526 PDE(inode)->data);
1527 }
1528
1529 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1530 {
1531 struct acpi_video_bus *video = seq->private;
1532 int status;
1533 unsigned long long id;
1534
1535
1536 if (!video)
1537 goto end;
1538
1539 status = acpi_video_bus_get_POST(video, &id);
1540 if (!ACPI_SUCCESS(status)) {
1541 seq_printf(seq, "<not supported>\n");
1542 goto end;
1543 }
1544 seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1545
1546 end:
1547 return 0;
1548 }
1549
1550 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1551 {
1552 struct acpi_video_bus *video = seq->private;
1553
1554
1555 seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1556
1557 return 0;
1558 }
1559
1560 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1561 {
1562 return single_open(file, acpi_video_bus_POST_seq_show,
1563 PDE(inode)->data);
1564 }
1565
1566 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1567 {
1568 return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1569 }
1570
1571 static ssize_t
1572 acpi_video_bus_write_POST(struct file *file,
1573 const char __user * buffer,
1574 size_t count, loff_t * data)
1575 {
1576 int status;
1577 struct seq_file *m = file->private_data;
1578 struct acpi_video_bus *video = m->private;
1579 char str[12] = { 0 };
1580 unsigned long long opt, options;
1581
1582
1583 if (!video || count >= sizeof(str))
1584 return -EINVAL;
1585
1586 status = acpi_video_bus_POST_options(video, &options);
1587 if (!ACPI_SUCCESS(status))
1588 return -EINVAL;
1589
1590 if (copy_from_user(str, buffer, count))
1591 return -EFAULT;
1592
1593 str[count] = 0;
1594 opt = strtoul(str, NULL, 0);
1595 if (opt > 3)
1596 return -EFAULT;
1597
1598 /* just in case an OEM 'forgot' the motherboard... */
1599 options |= 1;
1600
1601 if (options & (1ul << opt)) {
1602 status = acpi_video_bus_set_POST(video, opt);
1603 if (!ACPI_SUCCESS(status))
1604 return -EFAULT;
1605
1606 }
1607
1608 return count;
1609 }
1610
1611 static ssize_t
1612 acpi_video_bus_write_DOS(struct file *file,
1613 const char __user * buffer,
1614 size_t count, loff_t * data)
1615 {
1616 int status;
1617 struct seq_file *m = file->private_data;
1618 struct acpi_video_bus *video = m->private;
1619 char str[12] = { 0 };
1620 unsigned long opt;
1621
1622
1623 if (!video || count >= sizeof(str))
1624 return -EINVAL;
1625
1626 if (copy_from_user(str, buffer, count))
1627 return -EFAULT;
1628
1629 str[count] = 0;
1630 opt = strtoul(str, NULL, 0);
1631 if (opt > 7)
1632 return -EFAULT;
1633
1634 status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1635
1636 if (!ACPI_SUCCESS(status))
1637 return -EFAULT;
1638
1639 return count;
1640 }
1641
1642 static int acpi_video_bus_add_fs(struct acpi_device *device)
1643 {
1644 struct acpi_video_bus *video = acpi_driver_data(device);
1645 struct proc_dir_entry *device_dir;
1646 struct proc_dir_entry *entry;
1647
1648 device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1649 if (!device_dir)
1650 return -ENOMEM;
1651
1652 /* 'info' [R] */
1653 entry = proc_create_data("info", S_IRUGO, device_dir,
1654 &acpi_video_bus_info_fops,
1655 acpi_driver_data(device));
1656 if (!entry)
1657 goto err_remove_dir;
1658
1659 /* 'ROM' [R] */
1660 entry = proc_create_data("ROM", S_IRUGO, device_dir,
1661 &acpi_video_bus_ROM_fops,
1662 acpi_driver_data(device));
1663 if (!entry)
1664 goto err_remove_info;
1665
1666 /* 'POST_info' [R] */
1667 entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1668 &acpi_video_bus_POST_info_fops,
1669 acpi_driver_data(device));
1670 if (!entry)
1671 goto err_remove_rom;
1672
1673 /* 'POST' [R/W] */
1674 entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1675 device_dir,
1676 &acpi_video_bus_POST_fops,
1677 acpi_driver_data(device));
1678 if (!entry)
1679 goto err_remove_post_info;
1680
1681 /* 'DOS' [R/W] */
1682 entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1683 device_dir,
1684 &acpi_video_bus_DOS_fops,
1685 acpi_driver_data(device));
1686 if (!entry)
1687 goto err_remove_post;
1688
1689 video->dir = acpi_device_dir(device) = device_dir;
1690 return 0;
1691
1692 err_remove_post:
1693 remove_proc_entry("POST", device_dir);
1694 err_remove_post_info:
1695 remove_proc_entry("POST_info", device_dir);
1696 err_remove_rom:
1697 remove_proc_entry("ROM", device_dir);
1698 err_remove_info:
1699 remove_proc_entry("info", device_dir);
1700 err_remove_dir:
1701 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1702 return -ENOMEM;
1703 }
1704
1705 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1706 {
1707 struct proc_dir_entry *device_dir = acpi_device_dir(device);
1708
1709 if (device_dir) {
1710 remove_proc_entry("info", device_dir);
1711 remove_proc_entry("ROM", device_dir);
1712 remove_proc_entry("POST_info", device_dir);
1713 remove_proc_entry("POST", device_dir);
1714 remove_proc_entry("DOS", device_dir);
1715 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1716 acpi_device_dir(device) = NULL;
1717 }
1718
1719 return 0;
1720 }
1721
1722 /* --------------------------------------------------------------------------
1723 Driver Interface
1724 -------------------------------------------------------------------------- */
1725
1726 /* device interface */
1727 static struct acpi_video_device_attrib*
1728 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1729 {
1730 struct acpi_video_enumerated_device *ids;
1731 int i;
1732
1733 for (i = 0; i < video->attached_count; i++) {
1734 ids = &video->attached_array[i];
1735 if ((ids->value.int_val & 0xffff) == device_id)
1736 return &ids->value.attrib;
1737 }
1738
1739 return NULL;
1740 }
1741
1742 static int
1743 acpi_video_bus_get_one_device(struct acpi_device *device,
1744 struct acpi_video_bus *video)
1745 {
1746 unsigned long long device_id;
1747 int status;
1748 struct acpi_video_device *data;
1749 struct acpi_video_device_attrib* attribute;
1750
1751 if (!device || !video)
1752 return -EINVAL;
1753
1754 status =
1755 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1756 if (ACPI_SUCCESS(status)) {
1757
1758 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1759 if (!data)
1760 return -ENOMEM;
1761
1762 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1763 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1764 device->driver_data = data;
1765
1766 data->device_id = device_id;
1767 data->video = video;
1768 data->dev = device;
1769
1770 attribute = acpi_video_get_device_attr(video, device_id);
1771
1772 if((attribute != NULL) && attribute->device_id_scheme) {
1773 switch (attribute->display_type) {
1774 case ACPI_VIDEO_DISPLAY_CRT:
1775 data->flags.crt = 1;
1776 break;
1777 case ACPI_VIDEO_DISPLAY_TV:
1778 data->flags.tvout = 1;
1779 break;
1780 case ACPI_VIDEO_DISPLAY_DVI:
1781 data->flags.dvi = 1;
1782 break;
1783 case ACPI_VIDEO_DISPLAY_LCD:
1784 data->flags.lcd = 1;
1785 break;
1786 default:
1787 data->flags.unknown = 1;
1788 break;
1789 }
1790 if(attribute->bios_can_detect)
1791 data->flags.bios = 1;
1792 } else
1793 data->flags.unknown = 1;
1794
1795 acpi_video_device_bind(video, data);
1796 acpi_video_device_find_cap(data);
1797
1798 status = acpi_install_notify_handler(device->handle,
1799 ACPI_DEVICE_NOTIFY,
1800 acpi_video_device_notify,
1801 data);
1802 if (ACPI_FAILURE(status)) {
1803 printk(KERN_ERR PREFIX
1804 "Error installing notify handler\n");
1805 if(data->brightness)
1806 kfree(data->brightness->levels);
1807 kfree(data->brightness);
1808 kfree(data);
1809 return -ENODEV;
1810 }
1811
1812 mutex_lock(&video->device_list_lock);
1813 list_add_tail(&data->entry, &video->video_device_list);
1814 mutex_unlock(&video->device_list_lock);
1815
1816 acpi_video_device_add_fs(device);
1817
1818 return 0;
1819 }
1820
1821 return -ENOENT;
1822 }
1823
1824 /*
1825 * Arg:
1826 * video : video bus device
1827 *
1828 * Return:
1829 * none
1830 *
1831 * Enumerate the video device list of the video bus,
1832 * bind the ids with the corresponding video devices
1833 * under the video bus.
1834 */
1835
1836 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1837 {
1838 struct acpi_video_device *dev;
1839
1840 mutex_lock(&video->device_list_lock);
1841
1842 list_for_each_entry(dev, &video->video_device_list, entry)
1843 acpi_video_device_bind(video, dev);
1844
1845 mutex_unlock(&video->device_list_lock);
1846 }
1847
1848 /*
1849 * Arg:
1850 * video : video bus device
1851 * device : video output device under the video
1852 * bus
1853 *
1854 * Return:
1855 * none
1856 *
1857 * Bind the ids with the corresponding video devices
1858 * under the video bus.
1859 */
1860
1861 static void
1862 acpi_video_device_bind(struct acpi_video_bus *video,
1863 struct acpi_video_device *device)
1864 {
1865 struct acpi_video_enumerated_device *ids;
1866 int i;
1867
1868 for (i = 0; i < video->attached_count; i++) {
1869 ids = &video->attached_array[i];
1870 if (device->device_id == (ids->value.int_val & 0xffff)) {
1871 ids->bind_info = device;
1872 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1873 }
1874 }
1875 }
1876
1877 /*
1878 * Arg:
1879 * video : video bus device
1880 *
1881 * Return:
1882 * < 0 : error
1883 *
1884 * Call _DOD to enumerate all devices attached to display adapter
1885 *
1886 */
1887
1888 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1889 {
1890 int status;
1891 int count;
1892 int i;
1893 struct acpi_video_enumerated_device *active_list;
1894 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1895 union acpi_object *dod = NULL;
1896 union acpi_object *obj;
1897
1898 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1899 if (!ACPI_SUCCESS(status)) {
1900 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1901 return status;
1902 }
1903
1904 dod = buffer.pointer;
1905 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1906 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1907 status = -EFAULT;
1908 goto out;
1909 }
1910
1911 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1912 dod->package.count));
1913
1914 active_list = kcalloc(1 + dod->package.count,
1915 sizeof(struct acpi_video_enumerated_device),
1916 GFP_KERNEL);
1917 if (!active_list) {
1918 status = -ENOMEM;
1919 goto out;
1920 }
1921
1922 count = 0;
1923 for (i = 0; i < dod->package.count; i++) {
1924 obj = &dod->package.elements[i];
1925
1926 if (obj->type != ACPI_TYPE_INTEGER) {
1927 printk(KERN_ERR PREFIX
1928 "Invalid _DOD data in element %d\n", i);
1929 continue;
1930 }
1931
1932 active_list[count].value.int_val = obj->integer.value;
1933 active_list[count].bind_info = NULL;
1934 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1935 (int)obj->integer.value));
1936 count++;
1937 }
1938
1939 kfree(video->attached_array);
1940
1941 video->attached_array = active_list;
1942 video->attached_count = count;
1943
1944 out:
1945 kfree(buffer.pointer);
1946 return status;
1947 }
1948
1949 static int
1950 acpi_video_get_next_level(struct acpi_video_device *device,
1951 u32 level_current, u32 event)
1952 {
1953 int min, max, min_above, max_below, i, l, delta = 255;
1954 max = max_below = 0;
1955 min = min_above = 255;
1956 /* Find closest level to level_current */
1957 for (i = 2; i < device->brightness->count; i++) {
1958 l = device->brightness->levels[i];
1959 if (abs(l - level_current) < abs(delta)) {
1960 delta = l - level_current;
1961 if (!delta)
1962 break;
1963 }
1964 }
1965 /* Ajust level_current to closest available level */
1966 level_current += delta;
1967 for (i = 2; i < device->brightness->count; i++) {
1968 l = device->brightness->levels[i];
1969 if (l < min)
1970 min = l;
1971 if (l > max)
1972 max = l;
1973 if (l < min_above && l > level_current)
1974 min_above = l;
1975 if (l > max_below && l < level_current)
1976 max_below = l;
1977 }
1978
1979 switch (event) {
1980 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1981 return (level_current < max) ? min_above : min;
1982 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1983 return (level_current < max) ? min_above : max;
1984 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1985 return (level_current > min) ? max_below : min;
1986 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1987 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1988 return 0;
1989 default:
1990 return level_current;
1991 }
1992 }
1993
1994 static int
1995 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1996 {
1997 unsigned long long level_current, level_next;
1998 int result = -EINVAL;
1999
2000 /* no warning message if acpi_backlight=vendor is used */
2001 if (!acpi_video_backlight_support())
2002 return 0;
2003
2004 if (!device->brightness)
2005 goto out;
2006
2007 result = acpi_video_device_lcd_get_level_current(device,
2008 &level_current, 0);
2009 if (result)
2010 goto out;
2011
2012 level_next = acpi_video_get_next_level(device, level_current, event);
2013
2014 result = acpi_video_device_lcd_set_level(device, level_next);
2015
2016 if (!result)
2017 backlight_force_update(device->backlight,
2018 BACKLIGHT_UPDATE_HOTKEY);
2019
2020 out:
2021 if (result)
2022 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
2023
2024 return result;
2025 }
2026
2027 static int
2028 acpi_video_bus_get_devices(struct acpi_video_bus *video,
2029 struct acpi_device *device)
2030 {
2031 int status = 0;
2032 struct acpi_device *dev;
2033
2034 acpi_video_device_enumerate(video);
2035
2036 list_for_each_entry(dev, &device->children, node) {
2037
2038 status = acpi_video_bus_get_one_device(dev, video);
2039 if (ACPI_FAILURE(status)) {
2040 printk(KERN_WARNING PREFIX
2041 "Cant attach device");
2042 continue;
2043 }
2044 }
2045 return status;
2046 }
2047
2048 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
2049 {
2050 acpi_status status;
2051 struct acpi_video_bus *video;
2052
2053
2054 if (!device || !device->video)
2055 return -ENOENT;
2056
2057 video = device->video;
2058
2059 acpi_video_device_remove_fs(device->dev);
2060
2061 status = acpi_remove_notify_handler(device->dev->handle,
2062 ACPI_DEVICE_NOTIFY,
2063 acpi_video_device_notify);
2064 if (device->backlight) {
2065 sysfs_remove_link(&device->backlight->dev.kobj, "device");
2066 backlight_device_unregister(device->backlight);
2067 device->backlight = NULL;
2068 }
2069 if (device->cooling_dev) {
2070 sysfs_remove_link(&device->dev->dev.kobj,
2071 "thermal_cooling");
2072 sysfs_remove_link(&device->cooling_dev->device.kobj,
2073 "device");
2074 thermal_cooling_device_unregister(device->cooling_dev);
2075 device->cooling_dev = NULL;
2076 }
2077 video_output_unregister(device->output_dev);
2078
2079 return 0;
2080 }
2081
2082 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2083 {
2084 int status;
2085 struct acpi_video_device *dev, *next;
2086
2087 mutex_lock(&video->device_list_lock);
2088
2089 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2090
2091 status = acpi_video_bus_put_one_device(dev);
2092 if (ACPI_FAILURE(status))
2093 printk(KERN_WARNING PREFIX
2094 "hhuuhhuu bug in acpi video driver.\n");
2095
2096 if (dev->brightness) {
2097 kfree(dev->brightness->levels);
2098 kfree(dev->brightness);
2099 }
2100 list_del(&dev->entry);
2101 kfree(dev);
2102 }
2103
2104 mutex_unlock(&video->device_list_lock);
2105
2106 return 0;
2107 }
2108
2109 /* acpi_video interface */
2110
2111 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
2112 {
2113 return acpi_video_bus_DOS(video, 0, 0);
2114 }
2115
2116 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
2117 {
2118 return acpi_video_bus_DOS(video, 0, 1);
2119 }
2120
2121 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
2122 {
2123 struct acpi_video_bus *video = acpi_driver_data(device);
2124 struct input_dev *input;
2125 int keycode;
2126
2127 if (!video)
2128 return;
2129
2130 input = video->input;
2131
2132 switch (event) {
2133 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
2134 * most likely via hotkey. */
2135 acpi_bus_generate_proc_event(device, event, 0);
2136 keycode = KEY_SWITCHVIDEOMODE;
2137 break;
2138
2139 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
2140 * connector. */
2141 acpi_video_device_enumerate(video);
2142 acpi_video_device_rebind(video);
2143 acpi_bus_generate_proc_event(device, event, 0);
2144 keycode = KEY_SWITCHVIDEOMODE;
2145 break;
2146
2147 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
2148 acpi_bus_generate_proc_event(device, event, 0);
2149 keycode = KEY_SWITCHVIDEOMODE;
2150 break;
2151 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
2152 acpi_bus_generate_proc_event(device, event, 0);
2153 keycode = KEY_VIDEO_NEXT;
2154 break;
2155 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
2156 acpi_bus_generate_proc_event(device, event, 0);
2157 keycode = KEY_VIDEO_PREV;
2158 break;
2159
2160 default:
2161 keycode = KEY_UNKNOWN;
2162 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2163 "Unsupported event [0x%x]\n", event));
2164 break;
2165 }
2166
2167 acpi_notifier_call_chain(device, event, 0);
2168 input_report_key(input, keycode, 1);
2169 input_sync(input);
2170 input_report_key(input, keycode, 0);
2171 input_sync(input);
2172
2173 return;
2174 }
2175
2176 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
2177 {
2178 struct acpi_video_device *video_device = data;
2179 struct acpi_device *device = NULL;
2180 struct acpi_video_bus *bus;
2181 struct input_dev *input;
2182 int keycode;
2183
2184 if (!video_device)
2185 return;
2186
2187 device = video_device->dev;
2188 bus = video_device->video;
2189 input = bus->input;
2190
2191 switch (event) {
2192 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
2193 if (brightness_switch_enabled)
2194 acpi_video_switch_brightness(video_device, event);
2195 acpi_bus_generate_proc_event(device, event, 0);
2196 keycode = KEY_BRIGHTNESS_CYCLE;
2197 break;
2198 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
2199 if (brightness_switch_enabled)
2200 acpi_video_switch_brightness(video_device, event);
2201 acpi_bus_generate_proc_event(device, event, 0);
2202 keycode = KEY_BRIGHTNESSUP;
2203 break;
2204 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
2205 if (brightness_switch_enabled)
2206 acpi_video_switch_brightness(video_device, event);
2207 acpi_bus_generate_proc_event(device, event, 0);
2208 keycode = KEY_BRIGHTNESSDOWN;
2209 break;
2210 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
2211 if (brightness_switch_enabled)
2212 acpi_video_switch_brightness(video_device, event);
2213 acpi_bus_generate_proc_event(device, event, 0);
2214 keycode = KEY_BRIGHTNESS_ZERO;
2215 break;
2216 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
2217 if (brightness_switch_enabled)
2218 acpi_video_switch_brightness(video_device, event);
2219 acpi_bus_generate_proc_event(device, event, 0);
2220 keycode = KEY_DISPLAY_OFF;
2221 break;
2222 default:
2223 keycode = KEY_UNKNOWN;
2224 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2225 "Unsupported event [0x%x]\n", event));
2226 break;
2227 }
2228
2229 acpi_notifier_call_chain(device, event, 0);
2230 input_report_key(input, keycode, 1);
2231 input_sync(input);
2232 input_report_key(input, keycode, 0);
2233 input_sync(input);
2234
2235 return;
2236 }
2237
2238 static int instance;
2239 static int acpi_video_resume(struct acpi_device *device)
2240 {
2241 struct acpi_video_bus *video;
2242 struct acpi_video_device *video_device;
2243 int i;
2244
2245 if (!device || !acpi_driver_data(device))
2246 return -EINVAL;
2247
2248 video = acpi_driver_data(device);
2249
2250 for (i = 0; i < video->attached_count; i++) {
2251 video_device = video->attached_array[i].bind_info;
2252 if (video_device && video_device->backlight)
2253 acpi_video_set_brightness(video_device->backlight);
2254 }
2255 return AE_OK;
2256 }
2257
2258 static acpi_status
2259 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
2260 void **return_value)
2261 {
2262 struct acpi_device *device = context;
2263 struct acpi_device *sibling;
2264 int result;
2265
2266 if (handle == device->handle)
2267 return AE_CTRL_TERMINATE;
2268
2269 result = acpi_bus_get_device(handle, &sibling);
2270 if (result)
2271 return AE_OK;
2272
2273 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
2274 return AE_ALREADY_EXISTS;
2275
2276 return AE_OK;
2277 }
2278
2279 static int acpi_video_bus_add(struct acpi_device *device)
2280 {
2281 struct acpi_video_bus *video;
2282 struct input_dev *input;
2283 int error;
2284 acpi_status status;
2285
2286 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
2287 device->parent->handle, 1,
2288 acpi_video_bus_match, NULL,
2289 device, NULL);
2290 if (status == AE_ALREADY_EXISTS) {
2291 printk(KERN_WARNING FW_BUG
2292 "Duplicate ACPI video bus devices for the"
2293 " same VGA controller, please try module "
2294 "parameter \"video.allow_duplicates=1\""
2295 "if the current driver doesn't work.\n");
2296 if (!allow_duplicates)
2297 return -ENODEV;
2298 }
2299
2300 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2301 if (!video)
2302 return -ENOMEM;
2303
2304 /* a hack to fix the duplicate name "VID" problem on T61 */
2305 if (!strcmp(device->pnp.bus_id, "VID")) {
2306 if (instance)
2307 device->pnp.bus_id[3] = '0' + instance;
2308 instance ++;
2309 }
2310 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2311 if (!strcmp(device->pnp.bus_id, "VGA")) {
2312 if (instance)
2313 device->pnp.bus_id[3] = '0' + instance;
2314 instance++;
2315 }
2316
2317 video->device = device;
2318 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2319 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2320 device->driver_data = video;
2321
2322 acpi_video_bus_find_cap(video);
2323 error = acpi_video_bus_check(video);
2324 if (error)
2325 goto err_free_video;
2326
2327 error = acpi_video_bus_add_fs(device);
2328 if (error)
2329 goto err_free_video;
2330
2331 mutex_init(&video->device_list_lock);
2332 INIT_LIST_HEAD(&video->video_device_list);
2333
2334 acpi_video_bus_get_devices(video, device);
2335 acpi_video_bus_start_devices(video);
2336
2337 video->input = input = input_allocate_device();
2338 if (!input) {
2339 error = -ENOMEM;
2340 goto err_stop_video;
2341 }
2342
2343 snprintf(video->phys, sizeof(video->phys),
2344 "%s/video/input0", acpi_device_hid(video->device));
2345
2346 input->name = acpi_device_name(video->device);
2347 input->phys = video->phys;
2348 input->id.bustype = BUS_HOST;
2349 input->id.product = 0x06;
2350 input->dev.parent = &device->dev;
2351 input->evbit[0] = BIT(EV_KEY);
2352 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2353 set_bit(KEY_VIDEO_NEXT, input->keybit);
2354 set_bit(KEY_VIDEO_PREV, input->keybit);
2355 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2356 set_bit(KEY_BRIGHTNESSUP, input->keybit);
2357 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2358 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2359 set_bit(KEY_DISPLAY_OFF, input->keybit);
2360 set_bit(KEY_UNKNOWN, input->keybit);
2361
2362 error = input_register_device(input);
2363 if (error)
2364 goto err_free_input_dev;
2365
2366 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
2367 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2368 video->flags.multihead ? "yes" : "no",
2369 video->flags.rom ? "yes" : "no",
2370 video->flags.post ? "yes" : "no");
2371
2372 return 0;
2373
2374 err_free_input_dev:
2375 input_free_device(input);
2376 err_stop_video:
2377 acpi_video_bus_stop_devices(video);
2378 acpi_video_bus_put_devices(video);
2379 kfree(video->attached_array);
2380 acpi_video_bus_remove_fs(device);
2381 err_free_video:
2382 kfree(video);
2383 device->driver_data = NULL;
2384
2385 return error;
2386 }
2387
2388 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2389 {
2390 struct acpi_video_bus *video = NULL;
2391
2392
2393 if (!device || !acpi_driver_data(device))
2394 return -EINVAL;
2395
2396 video = acpi_driver_data(device);
2397
2398 acpi_video_bus_stop_devices(video);
2399 acpi_video_bus_put_devices(video);
2400 acpi_video_bus_remove_fs(device);
2401
2402 input_unregister_device(video->input);
2403 kfree(video->attached_array);
2404 kfree(video);
2405
2406 return 0;
2407 }
2408
2409 static int __init intel_opregion_present(void)
2410 {
2411 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
2412 struct pci_dev *dev = NULL;
2413 u32 address;
2414
2415 for_each_pci_dev(dev) {
2416 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2417 continue;
2418 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2419 continue;
2420 pci_read_config_dword(dev, 0xfc, &address);
2421 if (!address)
2422 continue;
2423 return 1;
2424 }
2425 #endif
2426 return 0;
2427 }
2428
2429 int acpi_video_register(void)
2430 {
2431 int result = 0;
2432 if (register_count) {
2433 /*
2434 * if the function of acpi_video_register is already called,
2435 * don't register the acpi_vide_bus again and return no error.
2436 */
2437 return 0;
2438 }
2439
2440 acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2441 if (!acpi_video_dir)
2442 return -ENODEV;
2443
2444 result = acpi_bus_register_driver(&acpi_video_bus);
2445 if (result < 0) {
2446 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2447 return -ENODEV;
2448 }
2449
2450 /*
2451 * When the acpi_video_bus is loaded successfully, increase
2452 * the counter reference.
2453 */
2454 register_count = 1;
2455
2456 return 0;
2457 }
2458 EXPORT_SYMBOL(acpi_video_register);
2459
2460 void acpi_video_unregister(void)
2461 {
2462 if (!register_count) {
2463 /*
2464 * If the acpi video bus is already unloaded, don't
2465 * unload it again and return directly.
2466 */
2467 return;
2468 }
2469 acpi_bus_unregister_driver(&acpi_video_bus);
2470
2471 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2472
2473 register_count = 0;
2474
2475 return;
2476 }
2477 EXPORT_SYMBOL(acpi_video_unregister);
2478
2479 /*
2480 * This is kind of nasty. Hardware using Intel chipsets may require
2481 * the video opregion code to be run first in order to initialise
2482 * state before any ACPI video calls are made. To handle this we defer
2483 * registration of the video class until the opregion code has run.
2484 */
2485
2486 static int __init acpi_video_init(void)
2487 {
2488 dmi_check_system(video_dmi_table);
2489
2490 if (intel_opregion_present())
2491 return 0;
2492
2493 return acpi_video_register();
2494 }
2495
2496 static void __exit acpi_video_exit(void)
2497 {
2498 acpi_video_unregister();
2499
2500 return;
2501 }
2502
2503 module_init(acpi_video_init);
2504 module_exit(acpi_video_exit);