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ACPI: video: DMI workaround another broken Acer BIOS enabling display brightness
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / acpi / video.c
1 /*
2 * video.c - ACPI Video Driver ($Revision:$)
3 *
4 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
5 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
6 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
7 *
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23 *
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 */
26
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/types.h>
31 #include <linux/list.h>
32 #include <linux/mutex.h>
33 #include <linux/proc_fs.h>
34 #include <linux/seq_file.h>
35 #include <linux/input.h>
36 #include <linux/backlight.h>
37 #include <linux/thermal.h>
38 #include <linux/video_output.h>
39 #include <linux/sort.h>
40 #include <linux/pci.h>
41 #include <linux/pci_ids.h>
42 #include <asm/uaccess.h>
43
44 #include <acpi/acpi_bus.h>
45 #include <acpi/acpi_drivers.h>
46
47 #define ACPI_VIDEO_CLASS "video"
48 #define ACPI_VIDEO_BUS_NAME "Video Bus"
49 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
50 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
51 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
52 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
53 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
54 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
55
56 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
57 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
58 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
59 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
60 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
61
62 #define MAX_NAME_LEN 20
63
64 #define ACPI_VIDEO_DISPLAY_CRT 1
65 #define ACPI_VIDEO_DISPLAY_TV 2
66 #define ACPI_VIDEO_DISPLAY_DVI 3
67 #define ACPI_VIDEO_DISPLAY_LCD 4
68
69 #define _COMPONENT ACPI_VIDEO_COMPONENT
70 ACPI_MODULE_NAME("video");
71
72 MODULE_AUTHOR("Bruno Ducrot");
73 MODULE_DESCRIPTION("ACPI Video Driver");
74 MODULE_LICENSE("GPL");
75
76 static int brightness_switch_enabled = 1;
77 module_param(brightness_switch_enabled, bool, 0644);
78
79 static int acpi_video_bus_add(struct acpi_device *device);
80 static int acpi_video_bus_remove(struct acpi_device *device, int type);
81 static int acpi_video_resume(struct acpi_device *device);
82 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
83
84 static const struct acpi_device_id video_device_ids[] = {
85 {ACPI_VIDEO_HID, 0},
86 {"", 0},
87 };
88 MODULE_DEVICE_TABLE(acpi, video_device_ids);
89
90 static struct acpi_driver acpi_video_bus = {
91 .name = "video",
92 .class = ACPI_VIDEO_CLASS,
93 .ids = video_device_ids,
94 .ops = {
95 .add = acpi_video_bus_add,
96 .remove = acpi_video_bus_remove,
97 .resume = acpi_video_resume,
98 .notify = acpi_video_bus_notify,
99 },
100 };
101
102 struct acpi_video_bus_flags {
103 u8 multihead:1; /* can switch video heads */
104 u8 rom:1; /* can retrieve a video rom */
105 u8 post:1; /* can configure the head to */
106 u8 reserved:5;
107 };
108
109 struct acpi_video_bus_cap {
110 u8 _DOS:1; /*Enable/Disable output switching */
111 u8 _DOD:1; /*Enumerate all devices attached to display adapter */
112 u8 _ROM:1; /*Get ROM Data */
113 u8 _GPD:1; /*Get POST Device */
114 u8 _SPD:1; /*Set POST Device */
115 u8 _VPO:1; /*Video POST Options */
116 u8 reserved:2;
117 };
118
119 struct acpi_video_device_attrib {
120 u32 display_index:4; /* A zero-based instance of the Display */
121 u32 display_port_attachment:4; /*This field differentiates the display type */
122 u32 display_type:4; /*Describe the specific type in use */
123 u32 vendor_specific:4; /*Chipset Vendor Specific */
124 u32 bios_can_detect:1; /*BIOS can detect the device */
125 u32 depend_on_vga:1; /*Non-VGA output device whose power is related to
126 the VGA device. */
127 u32 pipe_id:3; /*For VGA multiple-head devices. */
128 u32 reserved:10; /*Must be 0 */
129 u32 device_id_scheme:1; /*Device ID Scheme */
130 };
131
132 struct acpi_video_enumerated_device {
133 union {
134 u32 int_val;
135 struct acpi_video_device_attrib attrib;
136 } value;
137 struct acpi_video_device *bind_info;
138 };
139
140 struct acpi_video_bus {
141 struct acpi_device *device;
142 u8 dos_setting;
143 struct acpi_video_enumerated_device *attached_array;
144 u8 attached_count;
145 struct acpi_video_bus_cap cap;
146 struct acpi_video_bus_flags flags;
147 struct list_head video_device_list;
148 struct mutex device_list_lock; /* protects video_device_list */
149 struct proc_dir_entry *dir;
150 struct input_dev *input;
151 char phys[32]; /* for input device */
152 };
153
154 struct acpi_video_device_flags {
155 u8 crt:1;
156 u8 lcd:1;
157 u8 tvout:1;
158 u8 dvi:1;
159 u8 bios:1;
160 u8 unknown:1;
161 u8 reserved:2;
162 };
163
164 struct acpi_video_device_cap {
165 u8 _ADR:1; /*Return the unique ID */
166 u8 _BCL:1; /*Query list of brightness control levels supported */
167 u8 _BCM:1; /*Set the brightness level */
168 u8 _BQC:1; /* Get current brightness level */
169 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
170 u8 _DDC:1; /*Return the EDID for this device */
171 u8 _DCS:1; /*Return status of output device */
172 u8 _DGS:1; /*Query graphics state */
173 u8 _DSS:1; /*Device state set */
174 };
175
176 struct acpi_video_brightness_flags {
177 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
178 u8 _BCL_reversed:1; /* _BCL package is in a reversed order*/
179 u8 _BCL_use_index:1; /* levels in _BCL are index values */
180 u8 _BCM_use_index:1; /* input of _BCM is an index value */
181 u8 _BQC_use_index:1; /* _BQC returns an index value */
182 };
183
184 struct acpi_video_device_brightness {
185 int curr;
186 int count;
187 int *levels;
188 struct acpi_video_brightness_flags flags;
189 };
190
191 struct acpi_video_device {
192 unsigned long device_id;
193 struct acpi_video_device_flags flags;
194 struct acpi_video_device_cap cap;
195 struct list_head entry;
196 struct acpi_video_bus *video;
197 struct acpi_device *dev;
198 struct acpi_video_device_brightness *brightness;
199 struct backlight_device *backlight;
200 struct thermal_cooling_device *cdev;
201 struct output_device *output_dev;
202 };
203
204 /* bus */
205 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
206 static const struct file_operations acpi_video_bus_info_fops = {
207 .owner = THIS_MODULE,
208 .open = acpi_video_bus_info_open_fs,
209 .read = seq_read,
210 .llseek = seq_lseek,
211 .release = single_release,
212 };
213
214 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
215 static const struct file_operations acpi_video_bus_ROM_fops = {
216 .owner = THIS_MODULE,
217 .open = acpi_video_bus_ROM_open_fs,
218 .read = seq_read,
219 .llseek = seq_lseek,
220 .release = single_release,
221 };
222
223 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
224 struct file *file);
225 static const struct file_operations acpi_video_bus_POST_info_fops = {
226 .owner = THIS_MODULE,
227 .open = acpi_video_bus_POST_info_open_fs,
228 .read = seq_read,
229 .llseek = seq_lseek,
230 .release = single_release,
231 };
232
233 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
234 static ssize_t acpi_video_bus_write_POST(struct file *file,
235 const char __user *buffer, size_t count, loff_t *data);
236 static const struct file_operations acpi_video_bus_POST_fops = {
237 .owner = THIS_MODULE,
238 .open = acpi_video_bus_POST_open_fs,
239 .read = seq_read,
240 .write = acpi_video_bus_write_POST,
241 .llseek = seq_lseek,
242 .release = single_release,
243 };
244
245 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
246 static ssize_t acpi_video_bus_write_DOS(struct file *file,
247 const char __user *buffer, size_t count, loff_t *data);
248 static const struct file_operations acpi_video_bus_DOS_fops = {
249 .owner = THIS_MODULE,
250 .open = acpi_video_bus_DOS_open_fs,
251 .read = seq_read,
252 .write = acpi_video_bus_write_DOS,
253 .llseek = seq_lseek,
254 .release = single_release,
255 };
256
257 /* device */
258 static int acpi_video_device_info_open_fs(struct inode *inode,
259 struct file *file);
260 static const struct file_operations acpi_video_device_info_fops = {
261 .owner = THIS_MODULE,
262 .open = acpi_video_device_info_open_fs,
263 .read = seq_read,
264 .llseek = seq_lseek,
265 .release = single_release,
266 };
267
268 static int acpi_video_device_state_open_fs(struct inode *inode,
269 struct file *file);
270 static ssize_t acpi_video_device_write_state(struct file *file,
271 const char __user *buffer, size_t count, loff_t *data);
272 static const struct file_operations acpi_video_device_state_fops = {
273 .owner = THIS_MODULE,
274 .open = acpi_video_device_state_open_fs,
275 .read = seq_read,
276 .write = acpi_video_device_write_state,
277 .llseek = seq_lseek,
278 .release = single_release,
279 };
280
281 static int acpi_video_device_brightness_open_fs(struct inode *inode,
282 struct file *file);
283 static ssize_t acpi_video_device_write_brightness(struct file *file,
284 const char __user *buffer, size_t count, loff_t *data);
285 static struct file_operations acpi_video_device_brightness_fops = {
286 .owner = THIS_MODULE,
287 .open = acpi_video_device_brightness_open_fs,
288 .read = seq_read,
289 .write = acpi_video_device_write_brightness,
290 .llseek = seq_lseek,
291 .release = single_release,
292 };
293
294 static int acpi_video_device_EDID_open_fs(struct inode *inode,
295 struct file *file);
296 static const struct file_operations acpi_video_device_EDID_fops = {
297 .owner = THIS_MODULE,
298 .open = acpi_video_device_EDID_open_fs,
299 .read = seq_read,
300 .llseek = seq_lseek,
301 .release = single_release,
302 };
303
304 static const char device_decode[][30] = {
305 "motherboard VGA device",
306 "PCI VGA device",
307 "AGP VGA device",
308 "UNKNOWN",
309 };
310
311 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
312 static void acpi_video_device_rebind(struct acpi_video_bus *video);
313 static void acpi_video_device_bind(struct acpi_video_bus *video,
314 struct acpi_video_device *device);
315 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
316 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
317 int level);
318 static int acpi_video_device_lcd_get_level_current(
319 struct acpi_video_device *device,
320 unsigned long long *level);
321 static int acpi_video_get_next_level(struct acpi_video_device *device,
322 u32 level_current, u32 event);
323 static int acpi_video_switch_brightness(struct acpi_video_device *device,
324 int event);
325 static int acpi_video_device_get_state(struct acpi_video_device *device,
326 unsigned long long *state);
327 static int acpi_video_output_get(struct output_device *od);
328 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
329
330 /*backlight device sysfs support*/
331 static int acpi_video_get_brightness(struct backlight_device *bd)
332 {
333 unsigned long long cur_level;
334 int i;
335 struct acpi_video_device *vd =
336 (struct acpi_video_device *)bl_get_data(bd);
337
338 if (acpi_video_device_lcd_get_level_current(vd, &cur_level))
339 return -EINVAL;
340 for (i = 2; i < vd->brightness->count; i++) {
341 if (vd->brightness->levels[i] == cur_level)
342 /* The first two entries are special - see page 575
343 of the ACPI spec 3.0 */
344 return i-2;
345 }
346 return 0;
347 }
348
349 static int acpi_video_set_brightness(struct backlight_device *bd)
350 {
351 int request_level = bd->props.brightness + 2;
352 struct acpi_video_device *vd =
353 (struct acpi_video_device *)bl_get_data(bd);
354
355 return acpi_video_device_lcd_set_level(vd,
356 vd->brightness->levels[request_level]);
357 }
358
359 static struct backlight_ops acpi_backlight_ops = {
360 .get_brightness = acpi_video_get_brightness,
361 .update_status = acpi_video_set_brightness,
362 };
363
364 /*video output device sysfs support*/
365 static int acpi_video_output_get(struct output_device *od)
366 {
367 unsigned long long state;
368 struct acpi_video_device *vd =
369 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
370 acpi_video_device_get_state(vd, &state);
371 return (int)state;
372 }
373
374 static int acpi_video_output_set(struct output_device *od)
375 {
376 unsigned long state = od->request_state;
377 struct acpi_video_device *vd=
378 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
379 return acpi_video_device_set_state(vd, state);
380 }
381
382 static struct output_properties acpi_output_properties = {
383 .set_state = acpi_video_output_set,
384 .get_status = acpi_video_output_get,
385 };
386
387
388 /* thermal cooling device callbacks */
389 static int video_get_max_state(struct thermal_cooling_device *cdev, unsigned
390 long *state)
391 {
392 struct acpi_device *device = cdev->devdata;
393 struct acpi_video_device *video = acpi_driver_data(device);
394
395 *state = video->brightness->count - 3;
396 return 0;
397 }
398
399 static int video_get_cur_state(struct thermal_cooling_device *cdev, unsigned
400 long *state)
401 {
402 struct acpi_device *device = cdev->devdata;
403 struct acpi_video_device *video = acpi_driver_data(device);
404 unsigned long long level;
405 int offset;
406
407 if (acpi_video_device_lcd_get_level_current(video, &level))
408 return -EINVAL;
409 for (offset = 2; offset < video->brightness->count; offset++)
410 if (level == video->brightness->levels[offset]) {
411 *state = video->brightness->count - offset - 1;
412 return 0;
413 }
414
415 return -EINVAL;
416 }
417
418 static int
419 video_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
420 {
421 struct acpi_device *device = cdev->devdata;
422 struct acpi_video_device *video = acpi_driver_data(device);
423 int level;
424
425 if ( state >= video->brightness->count - 2)
426 return -EINVAL;
427
428 state = video->brightness->count - state;
429 level = video->brightness->levels[state -1];
430 return acpi_video_device_lcd_set_level(video, level);
431 }
432
433 static struct thermal_cooling_device_ops video_cooling_ops = {
434 .get_max_state = video_get_max_state,
435 .get_cur_state = video_get_cur_state,
436 .set_cur_state = video_set_cur_state,
437 };
438
439 /* --------------------------------------------------------------------------
440 Video Management
441 -------------------------------------------------------------------------- */
442
443 /* device */
444
445 static int
446 acpi_video_device_query(struct acpi_video_device *device, unsigned long long *state)
447 {
448 int status;
449
450 status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
451
452 return status;
453 }
454
455 static int
456 acpi_video_device_get_state(struct acpi_video_device *device,
457 unsigned long long *state)
458 {
459 int status;
460
461 status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
462
463 return status;
464 }
465
466 static int
467 acpi_video_device_set_state(struct acpi_video_device *device, int state)
468 {
469 int status;
470 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
471 struct acpi_object_list args = { 1, &arg0 };
472 unsigned long long ret;
473
474
475 arg0.integer.value = state;
476 status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
477
478 return status;
479 }
480
481 static int
482 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
483 union acpi_object **levels)
484 {
485 int status;
486 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
487 union acpi_object *obj;
488
489
490 *levels = NULL;
491
492 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
493 if (!ACPI_SUCCESS(status))
494 return status;
495 obj = (union acpi_object *)buffer.pointer;
496 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
497 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
498 status = -EFAULT;
499 goto err;
500 }
501
502 *levels = obj;
503
504 return 0;
505
506 err:
507 kfree(buffer.pointer);
508
509 return status;
510 }
511
512 static int
513 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
514 {
515 int status;
516 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
517 struct acpi_object_list args = { 1, &arg0 };
518 int state;
519
520 arg0.integer.value = level;
521
522 status = acpi_evaluate_object(device->dev->handle, "_BCM",
523 &args, NULL);
524 if (ACPI_FAILURE(status)) {
525 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
526 return -EIO;
527 }
528
529 device->brightness->curr = level;
530 for (state = 2; state < device->brightness->count; state++)
531 if (level == device->brightness->levels[state]) {
532 if (device->backlight)
533 device->backlight->props.brightness = state - 2;
534 return 0;
535 }
536
537 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
538 return -EINVAL;
539 }
540
541 /*
542 * For some buggy _BQC methods, we need to add a constant value to
543 * the _BQC return value to get the actual current brightness level
544 */
545
546 static int bqc_offset_aml_bug_workaround;
547 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
548 {
549 bqc_offset_aml_bug_workaround = 9;
550 return 0;
551 }
552
553 static struct dmi_system_id video_dmi_table[] __initdata = {
554 /*
555 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
556 */
557 {
558 .callback = video_set_bqc_offset,
559 .ident = "Acer Aspire 5720",
560 .matches = {
561 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
562 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
563 },
564 },
565 {
566 .callback = video_set_bqc_offset,
567 .ident = "Acer Aspire 5710Z",
568 .matches = {
569 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
570 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
571 },
572 },
573 {}
574 };
575
576 static int
577 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
578 unsigned long long *level)
579 {
580 acpi_status status = AE_OK;
581
582 if (device->cap._BQC || device->cap._BCQ) {
583 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
584
585 status = acpi_evaluate_integer(device->dev->handle, buf,
586 NULL, level);
587 if (ACPI_SUCCESS(status)) {
588 if (device->brightness->flags._BQC_use_index) {
589 if (device->brightness->flags._BCL_reversed)
590 *level = device->brightness->count
591 - 3 - (*level);
592 *level = device->brightness->levels[*level + 2];
593
594 }
595 *level += bqc_offset_aml_bug_workaround;
596 device->brightness->curr = *level;
597 return 0;
598 } else {
599 /* Fixme:
600 * should we return an error or ignore this failure?
601 * dev->brightness->curr is a cached value which stores
602 * the correct current backlight level in most cases.
603 * ACPI video backlight still works w/ buggy _BQC.
604 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
605 */
606 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
607 device->cap._BQC = device->cap._BCQ = 0;
608 }
609 }
610
611 *level = device->brightness->curr;
612 return 0;
613 }
614
615 static int
616 acpi_video_device_EDID(struct acpi_video_device *device,
617 union acpi_object **edid, ssize_t length)
618 {
619 int status;
620 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
621 union acpi_object *obj;
622 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
623 struct acpi_object_list args = { 1, &arg0 };
624
625
626 *edid = NULL;
627
628 if (!device)
629 return -ENODEV;
630 if (length == 128)
631 arg0.integer.value = 1;
632 else if (length == 256)
633 arg0.integer.value = 2;
634 else
635 return -EINVAL;
636
637 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
638 if (ACPI_FAILURE(status))
639 return -ENODEV;
640
641 obj = buffer.pointer;
642
643 if (obj && obj->type == ACPI_TYPE_BUFFER)
644 *edid = obj;
645 else {
646 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
647 status = -EFAULT;
648 kfree(obj);
649 }
650
651 return status;
652 }
653
654 /* bus */
655
656 static int
657 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
658 {
659 int status;
660 unsigned long long tmp;
661 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
662 struct acpi_object_list args = { 1, &arg0 };
663
664
665 arg0.integer.value = option;
666
667 status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
668 if (ACPI_SUCCESS(status))
669 status = tmp ? (-EINVAL) : (AE_OK);
670
671 return status;
672 }
673
674 static int
675 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long long *id)
676 {
677 int status;
678
679 status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
680
681 return status;
682 }
683
684 static int
685 acpi_video_bus_POST_options(struct acpi_video_bus *video,
686 unsigned long long *options)
687 {
688 int status;
689
690 status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
691 *options &= 3;
692
693 return status;
694 }
695
696 /*
697 * Arg:
698 * video : video bus device pointer
699 * bios_flag :
700 * 0. The system BIOS should NOT automatically switch(toggle)
701 * the active display output.
702 * 1. The system BIOS should automatically switch (toggle) the
703 * active display output. No switch event.
704 * 2. The _DGS value should be locked.
705 * 3. The system BIOS should not automatically switch (toggle) the
706 * active display output, but instead generate the display switch
707 * event notify code.
708 * lcd_flag :
709 * 0. The system BIOS should automatically control the brightness level
710 * of the LCD when the power changes from AC to DC
711 * 1. The system BIOS should NOT automatically control the brightness
712 * level of the LCD when the power changes from AC to DC.
713 * Return Value:
714 * -1 wrong arg.
715 */
716
717 static int
718 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
719 {
720 acpi_integer status = 0;
721 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
722 struct acpi_object_list args = { 1, &arg0 };
723
724
725 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
726 status = -1;
727 goto Failed;
728 }
729 arg0.integer.value = (lcd_flag << 2) | bios_flag;
730 video->dos_setting = arg0.integer.value;
731 acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
732
733 Failed:
734 return status;
735 }
736
737 /*
738 * Simple comparison function used to sort backlight levels.
739 */
740
741 static int
742 acpi_video_cmp_level(const void *a, const void *b)
743 {
744 return *(int *)a - *(int *)b;
745 }
746
747 /*
748 * Arg:
749 * device : video output device (LCD, CRT, ..)
750 *
751 * Return Value:
752 * Maximum brightness level
753 *
754 * Allocate and initialize device->brightness.
755 */
756
757 static int
758 acpi_video_init_brightness(struct acpi_video_device *device)
759 {
760 union acpi_object *obj = NULL;
761 int i, max_level = 0, count = 0, level_ac_battery = 0;
762 unsigned long long level, level_old;
763 union acpi_object *o;
764 struct acpi_video_device_brightness *br = NULL;
765 int result = -EINVAL;
766
767 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
768 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
769 "LCD brightness level\n"));
770 goto out;
771 }
772
773 if (obj->package.count < 2)
774 goto out;
775
776 br = kzalloc(sizeof(*br), GFP_KERNEL);
777 if (!br) {
778 printk(KERN_ERR "can't allocate memory\n");
779 result = -ENOMEM;
780 goto out;
781 }
782
783 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
784 GFP_KERNEL);
785 if (!br->levels) {
786 result = -ENOMEM;
787 goto out_free;
788 }
789
790 for (i = 0; i < obj->package.count; i++) {
791 o = (union acpi_object *)&obj->package.elements[i];
792 if (o->type != ACPI_TYPE_INTEGER) {
793 printk(KERN_ERR PREFIX "Invalid data\n");
794 continue;
795 }
796 br->levels[count] = (u32) o->integer.value;
797
798 if (br->levels[count] > max_level)
799 max_level = br->levels[count];
800 count++;
801 }
802
803 /*
804 * some buggy BIOS don't export the levels
805 * when machine is on AC/Battery in _BCL package.
806 * In this case, the first two elements in _BCL packages
807 * are also supported brightness levels that OS should take care of.
808 */
809 for (i = 2; i < count; i++)
810 if (br->levels[i] == br->levels[0] ||
811 br->levels[i] == br->levels[1])
812 level_ac_battery++;
813
814 if (level_ac_battery < 2) {
815 level_ac_battery = 2 - level_ac_battery;
816 br->flags._BCL_no_ac_battery_levels = 1;
817 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
818 br->levels[i] = br->levels[i - level_ac_battery];
819 count += level_ac_battery;
820 } else if (level_ac_battery > 2)
821 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
822
823 /* Check if the _BCL package is in a reversed order */
824 if (max_level == br->levels[2]) {
825 br->flags._BCL_reversed = 1;
826 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
827 acpi_video_cmp_level, NULL);
828 } else if (max_level != br->levels[count - 1])
829 ACPI_ERROR((AE_INFO,
830 "Found unordered _BCL package\n"));
831
832 br->count = count;
833 device->brightness = br;
834
835 /* Check the input/output of _BQC/_BCL/_BCM */
836 if ((max_level < 100) && (max_level <= (count - 2)))
837 br->flags._BCL_use_index = 1;
838
839 /*
840 * _BCM is always consistent with _BCL,
841 * at least for all the laptops we have ever seen.
842 */
843 br->flags._BCM_use_index = br->flags._BCL_use_index;
844
845 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
846 br->curr = max_level;
847 result = acpi_video_device_lcd_get_level_current(device, &level_old);
848 if (result)
849 goto out_free_levels;
850
851 result = acpi_video_device_lcd_set_level(device, br->curr);
852 if (result)
853 goto out_free_levels;
854
855 result = acpi_video_device_lcd_get_level_current(device, &level);
856 if (result)
857 goto out_free_levels;
858
859 if ((level != level_old) && !br->flags._BCM_use_index) {
860 /* Note:
861 * This piece of code does not work correctly if the current
862 * brightness levels is 0.
863 * But I guess boxes that boot with such a dark screen are rare
864 * and no more code is needed to cover this specifial case.
865 */
866
867 if (level_ac_battery != 2) {
868 /*
869 * For now, we don't support the _BCL like this:
870 * 16, 15, 0, 1, 2, 3, ..., 14, 15, 16
871 * because we may mess up the index returned by _BQC.
872 * Plus: we have not got a box like this.
873 */
874 ACPI_ERROR((AE_INFO, "_BCL not supported\n"));
875 }
876 br->flags._BQC_use_index = 1;
877 }
878
879 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
880 "found %d brightness levels\n", count - 2));
881 kfree(obj);
882 return result;
883
884 out_free_levels:
885 kfree(br->levels);
886 out_free:
887 kfree(br);
888 out:
889 device->brightness = NULL;
890 kfree(obj);
891 return result;
892 }
893
894 /*
895 * Arg:
896 * device : video output device (LCD, CRT, ..)
897 *
898 * Return Value:
899 * None
900 *
901 * Find out all required AML methods defined under the output
902 * device.
903 */
904
905 static void acpi_video_device_find_cap(struct acpi_video_device *device)
906 {
907 acpi_handle h_dummy1;
908
909
910 memset(&device->cap, 0, sizeof(device->cap));
911
912 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
913 device->cap._ADR = 1;
914 }
915 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
916 device->cap._BCL = 1;
917 }
918 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
919 device->cap._BCM = 1;
920 }
921 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
922 device->cap._BQC = 1;
923 else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
924 &h_dummy1))) {
925 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
926 device->cap._BCQ = 1;
927 }
928
929 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
930 device->cap._DDC = 1;
931 }
932 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
933 device->cap._DCS = 1;
934 }
935 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
936 device->cap._DGS = 1;
937 }
938 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
939 device->cap._DSS = 1;
940 }
941
942 if (acpi_video_backlight_support()) {
943 int result;
944 static int count = 0;
945 char *name;
946
947 result = acpi_video_init_brightness(device);
948 if (result)
949 return;
950 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
951 if (!name)
952 return;
953
954 sprintf(name, "acpi_video%d", count++);
955 device->backlight = backlight_device_register(name,
956 NULL, device, &acpi_backlight_ops);
957 device->backlight->props.max_brightness = device->brightness->count-3;
958 kfree(name);
959
960 device->cdev = thermal_cooling_device_register("LCD",
961 device->dev, &video_cooling_ops);
962 if (IS_ERR(device->cdev))
963 return;
964
965 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
966 device->cdev->id);
967 result = sysfs_create_link(&device->dev->dev.kobj,
968 &device->cdev->device.kobj,
969 "thermal_cooling");
970 if (result)
971 printk(KERN_ERR PREFIX "Create sysfs link\n");
972 result = sysfs_create_link(&device->cdev->device.kobj,
973 &device->dev->dev.kobj, "device");
974 if (result)
975 printk(KERN_ERR PREFIX "Create sysfs link\n");
976
977 }
978
979 if (acpi_video_display_switch_support()) {
980
981 if (device->cap._DCS && device->cap._DSS) {
982 static int count;
983 char *name;
984 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
985 if (!name)
986 return;
987 sprintf(name, "acpi_video%d", count++);
988 device->output_dev = video_output_register(name,
989 NULL, device, &acpi_output_properties);
990 kfree(name);
991 }
992 }
993 }
994
995 /*
996 * Arg:
997 * device : video output device (VGA)
998 *
999 * Return Value:
1000 * None
1001 *
1002 * Find out all required AML methods defined under the video bus device.
1003 */
1004
1005 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1006 {
1007 acpi_handle h_dummy1;
1008
1009 memset(&video->cap, 0, sizeof(video->cap));
1010 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
1011 video->cap._DOS = 1;
1012 }
1013 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
1014 video->cap._DOD = 1;
1015 }
1016 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
1017 video->cap._ROM = 1;
1018 }
1019 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
1020 video->cap._GPD = 1;
1021 }
1022 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
1023 video->cap._SPD = 1;
1024 }
1025 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
1026 video->cap._VPO = 1;
1027 }
1028 }
1029
1030 /*
1031 * Check whether the video bus device has required AML method to
1032 * support the desired features
1033 */
1034
1035 static int acpi_video_bus_check(struct acpi_video_bus *video)
1036 {
1037 acpi_status status = -ENOENT;
1038 struct device *dev;
1039
1040 if (!video)
1041 return -EINVAL;
1042
1043 dev = acpi_get_physical_pci_device(video->device->handle);
1044 if (!dev)
1045 return -ENODEV;
1046 put_device(dev);
1047
1048 /* Since there is no HID, CID and so on for VGA driver, we have
1049 * to check well known required nodes.
1050 */
1051
1052 /* Does this device support video switching? */
1053 if (video->cap._DOS) {
1054 video->flags.multihead = 1;
1055 status = 0;
1056 }
1057
1058 /* Does this device support retrieving a video ROM? */
1059 if (video->cap._ROM) {
1060 video->flags.rom = 1;
1061 status = 0;
1062 }
1063
1064 /* Does this device support configuring which video device to POST? */
1065 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1066 video->flags.post = 1;
1067 status = 0;
1068 }
1069
1070 return status;
1071 }
1072
1073 /* --------------------------------------------------------------------------
1074 FS Interface (/proc)
1075 -------------------------------------------------------------------------- */
1076
1077 static struct proc_dir_entry *acpi_video_dir;
1078
1079 /* video devices */
1080
1081 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
1082 {
1083 struct acpi_video_device *dev = seq->private;
1084
1085
1086 if (!dev)
1087 goto end;
1088
1089 seq_printf(seq, "device_id: 0x%04x\n", (u32) dev->device_id);
1090 seq_printf(seq, "type: ");
1091 if (dev->flags.crt)
1092 seq_printf(seq, "CRT\n");
1093 else if (dev->flags.lcd)
1094 seq_printf(seq, "LCD\n");
1095 else if (dev->flags.tvout)
1096 seq_printf(seq, "TVOUT\n");
1097 else if (dev->flags.dvi)
1098 seq_printf(seq, "DVI\n");
1099 else
1100 seq_printf(seq, "UNKNOWN\n");
1101
1102 seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
1103
1104 end:
1105 return 0;
1106 }
1107
1108 static int
1109 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
1110 {
1111 return single_open(file, acpi_video_device_info_seq_show,
1112 PDE(inode)->data);
1113 }
1114
1115 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
1116 {
1117 int status;
1118 struct acpi_video_device *dev = seq->private;
1119 unsigned long long state;
1120
1121
1122 if (!dev)
1123 goto end;
1124
1125 status = acpi_video_device_get_state(dev, &state);
1126 seq_printf(seq, "state: ");
1127 if (ACPI_SUCCESS(status))
1128 seq_printf(seq, "0x%02llx\n", state);
1129 else
1130 seq_printf(seq, "<not supported>\n");
1131
1132 status = acpi_video_device_query(dev, &state);
1133 seq_printf(seq, "query: ");
1134 if (ACPI_SUCCESS(status))
1135 seq_printf(seq, "0x%02llx\n", state);
1136 else
1137 seq_printf(seq, "<not supported>\n");
1138
1139 end:
1140 return 0;
1141 }
1142
1143 static int
1144 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
1145 {
1146 return single_open(file, acpi_video_device_state_seq_show,
1147 PDE(inode)->data);
1148 }
1149
1150 static ssize_t
1151 acpi_video_device_write_state(struct file *file,
1152 const char __user * buffer,
1153 size_t count, loff_t * data)
1154 {
1155 int status;
1156 struct seq_file *m = file->private_data;
1157 struct acpi_video_device *dev = m->private;
1158 char str[12] = { 0 };
1159 u32 state = 0;
1160
1161
1162 if (!dev || count + 1 > sizeof str)
1163 return -EINVAL;
1164
1165 if (copy_from_user(str, buffer, count))
1166 return -EFAULT;
1167
1168 str[count] = 0;
1169 state = simple_strtoul(str, NULL, 0);
1170 state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
1171
1172 status = acpi_video_device_set_state(dev, state);
1173
1174 if (status)
1175 return -EFAULT;
1176
1177 return count;
1178 }
1179
1180 static int
1181 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
1182 {
1183 struct acpi_video_device *dev = seq->private;
1184 int i;
1185
1186
1187 if (!dev || !dev->brightness) {
1188 seq_printf(seq, "<not supported>\n");
1189 return 0;
1190 }
1191
1192 seq_printf(seq, "levels: ");
1193 for (i = 2; i < dev->brightness->count; i++)
1194 seq_printf(seq, " %d", dev->brightness->levels[i]);
1195 seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
1196
1197 return 0;
1198 }
1199
1200 static int
1201 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1202 {
1203 return single_open(file, acpi_video_device_brightness_seq_show,
1204 PDE(inode)->data);
1205 }
1206
1207 static ssize_t
1208 acpi_video_device_write_brightness(struct file *file,
1209 const char __user * buffer,
1210 size_t count, loff_t * data)
1211 {
1212 struct seq_file *m = file->private_data;
1213 struct acpi_video_device *dev = m->private;
1214 char str[5] = { 0 };
1215 unsigned int level = 0;
1216 int i;
1217
1218
1219 if (!dev || !dev->brightness || count + 1 > sizeof str)
1220 return -EINVAL;
1221
1222 if (copy_from_user(str, buffer, count))
1223 return -EFAULT;
1224
1225 str[count] = 0;
1226 level = simple_strtoul(str, NULL, 0);
1227
1228 if (level > 100)
1229 return -EFAULT;
1230
1231 /* validate through the list of available levels */
1232 for (i = 2; i < dev->brightness->count; i++)
1233 if (level == dev->brightness->levels[i]) {
1234 if (!acpi_video_device_lcd_set_level(dev, level))
1235 return count;
1236 break;
1237 }
1238
1239 return -EINVAL;
1240 }
1241
1242 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1243 {
1244 struct acpi_video_device *dev = seq->private;
1245 int status;
1246 int i;
1247 union acpi_object *edid = NULL;
1248
1249
1250 if (!dev)
1251 goto out;
1252
1253 status = acpi_video_device_EDID(dev, &edid, 128);
1254 if (ACPI_FAILURE(status)) {
1255 status = acpi_video_device_EDID(dev, &edid, 256);
1256 }
1257
1258 if (ACPI_FAILURE(status)) {
1259 goto out;
1260 }
1261
1262 if (edid && edid->type == ACPI_TYPE_BUFFER) {
1263 for (i = 0; i < edid->buffer.length; i++)
1264 seq_putc(seq, edid->buffer.pointer[i]);
1265 }
1266
1267 out:
1268 if (!edid)
1269 seq_printf(seq, "<not supported>\n");
1270 else
1271 kfree(edid);
1272
1273 return 0;
1274 }
1275
1276 static int
1277 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1278 {
1279 return single_open(file, acpi_video_device_EDID_seq_show,
1280 PDE(inode)->data);
1281 }
1282
1283 static int acpi_video_device_add_fs(struct acpi_device *device)
1284 {
1285 struct proc_dir_entry *entry, *device_dir;
1286 struct acpi_video_device *vid_dev;
1287
1288 vid_dev = acpi_driver_data(device);
1289 if (!vid_dev)
1290 return -ENODEV;
1291
1292 device_dir = proc_mkdir(acpi_device_bid(device),
1293 vid_dev->video->dir);
1294 if (!device_dir)
1295 return -ENOMEM;
1296
1297 /* 'info' [R] */
1298 entry = proc_create_data("info", S_IRUGO, device_dir,
1299 &acpi_video_device_info_fops, acpi_driver_data(device));
1300 if (!entry)
1301 goto err_remove_dir;
1302
1303 /* 'state' [R/W] */
1304 entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1305 device_dir,
1306 &acpi_video_device_state_fops,
1307 acpi_driver_data(device));
1308 if (!entry)
1309 goto err_remove_info;
1310
1311 /* 'brightness' [R/W] */
1312 entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1313 device_dir,
1314 &acpi_video_device_brightness_fops,
1315 acpi_driver_data(device));
1316 if (!entry)
1317 goto err_remove_state;
1318
1319 /* 'EDID' [R] */
1320 entry = proc_create_data("EDID", S_IRUGO, device_dir,
1321 &acpi_video_device_EDID_fops,
1322 acpi_driver_data(device));
1323 if (!entry)
1324 goto err_remove_brightness;
1325
1326 acpi_device_dir(device) = device_dir;
1327
1328 return 0;
1329
1330 err_remove_brightness:
1331 remove_proc_entry("brightness", device_dir);
1332 err_remove_state:
1333 remove_proc_entry("state", device_dir);
1334 err_remove_info:
1335 remove_proc_entry("info", device_dir);
1336 err_remove_dir:
1337 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1338 return -ENOMEM;
1339 }
1340
1341 static int acpi_video_device_remove_fs(struct acpi_device *device)
1342 {
1343 struct acpi_video_device *vid_dev;
1344 struct proc_dir_entry *device_dir;
1345
1346 vid_dev = acpi_driver_data(device);
1347 if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1348 return -ENODEV;
1349
1350 device_dir = acpi_device_dir(device);
1351 if (device_dir) {
1352 remove_proc_entry("info", device_dir);
1353 remove_proc_entry("state", device_dir);
1354 remove_proc_entry("brightness", device_dir);
1355 remove_proc_entry("EDID", device_dir);
1356 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1357 acpi_device_dir(device) = NULL;
1358 }
1359
1360 return 0;
1361 }
1362
1363 /* video bus */
1364 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1365 {
1366 struct acpi_video_bus *video = seq->private;
1367
1368
1369 if (!video)
1370 goto end;
1371
1372 seq_printf(seq, "Switching heads: %s\n",
1373 video->flags.multihead ? "yes" : "no");
1374 seq_printf(seq, "Video ROM: %s\n",
1375 video->flags.rom ? "yes" : "no");
1376 seq_printf(seq, "Device to be POSTed on boot: %s\n",
1377 video->flags.post ? "yes" : "no");
1378
1379 end:
1380 return 0;
1381 }
1382
1383 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1384 {
1385 return single_open(file, acpi_video_bus_info_seq_show,
1386 PDE(inode)->data);
1387 }
1388
1389 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1390 {
1391 struct acpi_video_bus *video = seq->private;
1392
1393
1394 if (!video)
1395 goto end;
1396
1397 printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1398 seq_printf(seq, "<TODO>\n");
1399
1400 end:
1401 return 0;
1402 }
1403
1404 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1405 {
1406 return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1407 }
1408
1409 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1410 {
1411 struct acpi_video_bus *video = seq->private;
1412 unsigned long long options;
1413 int status;
1414
1415
1416 if (!video)
1417 goto end;
1418
1419 status = acpi_video_bus_POST_options(video, &options);
1420 if (ACPI_SUCCESS(status)) {
1421 if (!(options & 1)) {
1422 printk(KERN_WARNING PREFIX
1423 "The motherboard VGA device is not listed as a possible POST device.\n");
1424 printk(KERN_WARNING PREFIX
1425 "This indicates a BIOS bug. Please contact the manufacturer.\n");
1426 }
1427 printk(KERN_WARNING "%llx\n", options);
1428 seq_printf(seq, "can POST: <integrated video>");
1429 if (options & 2)
1430 seq_printf(seq, " <PCI video>");
1431 if (options & 4)
1432 seq_printf(seq, " <AGP video>");
1433 seq_putc(seq, '\n');
1434 } else
1435 seq_printf(seq, "<not supported>\n");
1436 end:
1437 return 0;
1438 }
1439
1440 static int
1441 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1442 {
1443 return single_open(file, acpi_video_bus_POST_info_seq_show,
1444 PDE(inode)->data);
1445 }
1446
1447 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1448 {
1449 struct acpi_video_bus *video = seq->private;
1450 int status;
1451 unsigned long long id;
1452
1453
1454 if (!video)
1455 goto end;
1456
1457 status = acpi_video_bus_get_POST(video, &id);
1458 if (!ACPI_SUCCESS(status)) {
1459 seq_printf(seq, "<not supported>\n");
1460 goto end;
1461 }
1462 seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1463
1464 end:
1465 return 0;
1466 }
1467
1468 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1469 {
1470 struct acpi_video_bus *video = seq->private;
1471
1472
1473 seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1474
1475 return 0;
1476 }
1477
1478 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1479 {
1480 return single_open(file, acpi_video_bus_POST_seq_show,
1481 PDE(inode)->data);
1482 }
1483
1484 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1485 {
1486 return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1487 }
1488
1489 static ssize_t
1490 acpi_video_bus_write_POST(struct file *file,
1491 const char __user * buffer,
1492 size_t count, loff_t * data)
1493 {
1494 int status;
1495 struct seq_file *m = file->private_data;
1496 struct acpi_video_bus *video = m->private;
1497 char str[12] = { 0 };
1498 unsigned long long opt, options;
1499
1500
1501 if (!video || count + 1 > sizeof str)
1502 return -EINVAL;
1503
1504 status = acpi_video_bus_POST_options(video, &options);
1505 if (!ACPI_SUCCESS(status))
1506 return -EINVAL;
1507
1508 if (copy_from_user(str, buffer, count))
1509 return -EFAULT;
1510
1511 str[count] = 0;
1512 opt = strtoul(str, NULL, 0);
1513 if (opt > 3)
1514 return -EFAULT;
1515
1516 /* just in case an OEM 'forgot' the motherboard... */
1517 options |= 1;
1518
1519 if (options & (1ul << opt)) {
1520 status = acpi_video_bus_set_POST(video, opt);
1521 if (!ACPI_SUCCESS(status))
1522 return -EFAULT;
1523
1524 }
1525
1526 return count;
1527 }
1528
1529 static ssize_t
1530 acpi_video_bus_write_DOS(struct file *file,
1531 const char __user * buffer,
1532 size_t count, loff_t * data)
1533 {
1534 int status;
1535 struct seq_file *m = file->private_data;
1536 struct acpi_video_bus *video = m->private;
1537 char str[12] = { 0 };
1538 unsigned long opt;
1539
1540
1541 if (!video || count + 1 > sizeof str)
1542 return -EINVAL;
1543
1544 if (copy_from_user(str, buffer, count))
1545 return -EFAULT;
1546
1547 str[count] = 0;
1548 opt = strtoul(str, NULL, 0);
1549 if (opt > 7)
1550 return -EFAULT;
1551
1552 status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1553
1554 if (!ACPI_SUCCESS(status))
1555 return -EFAULT;
1556
1557 return count;
1558 }
1559
1560 static int acpi_video_bus_add_fs(struct acpi_device *device)
1561 {
1562 struct acpi_video_bus *video = acpi_driver_data(device);
1563 struct proc_dir_entry *device_dir;
1564 struct proc_dir_entry *entry;
1565
1566 device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1567 if (!device_dir)
1568 return -ENOMEM;
1569
1570 /* 'info' [R] */
1571 entry = proc_create_data("info", S_IRUGO, device_dir,
1572 &acpi_video_bus_info_fops,
1573 acpi_driver_data(device));
1574 if (!entry)
1575 goto err_remove_dir;
1576
1577 /* 'ROM' [R] */
1578 entry = proc_create_data("ROM", S_IRUGO, device_dir,
1579 &acpi_video_bus_ROM_fops,
1580 acpi_driver_data(device));
1581 if (!entry)
1582 goto err_remove_info;
1583
1584 /* 'POST_info' [R] */
1585 entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1586 &acpi_video_bus_POST_info_fops,
1587 acpi_driver_data(device));
1588 if (!entry)
1589 goto err_remove_rom;
1590
1591 /* 'POST' [R/W] */
1592 entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1593 device_dir,
1594 &acpi_video_bus_POST_fops,
1595 acpi_driver_data(device));
1596 if (!entry)
1597 goto err_remove_post_info;
1598
1599 /* 'DOS' [R/W] */
1600 entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1601 device_dir,
1602 &acpi_video_bus_DOS_fops,
1603 acpi_driver_data(device));
1604 if (!entry)
1605 goto err_remove_post;
1606
1607 video->dir = acpi_device_dir(device) = device_dir;
1608 return 0;
1609
1610 err_remove_post:
1611 remove_proc_entry("POST", device_dir);
1612 err_remove_post_info:
1613 remove_proc_entry("POST_info", device_dir);
1614 err_remove_rom:
1615 remove_proc_entry("ROM", device_dir);
1616 err_remove_info:
1617 remove_proc_entry("info", device_dir);
1618 err_remove_dir:
1619 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1620 return -ENOMEM;
1621 }
1622
1623 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1624 {
1625 struct proc_dir_entry *device_dir = acpi_device_dir(device);
1626
1627 if (device_dir) {
1628 remove_proc_entry("info", device_dir);
1629 remove_proc_entry("ROM", device_dir);
1630 remove_proc_entry("POST_info", device_dir);
1631 remove_proc_entry("POST", device_dir);
1632 remove_proc_entry("DOS", device_dir);
1633 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1634 acpi_device_dir(device) = NULL;
1635 }
1636
1637 return 0;
1638 }
1639
1640 /* --------------------------------------------------------------------------
1641 Driver Interface
1642 -------------------------------------------------------------------------- */
1643
1644 /* device interface */
1645 static struct acpi_video_device_attrib*
1646 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1647 {
1648 struct acpi_video_enumerated_device *ids;
1649 int i;
1650
1651 for (i = 0; i < video->attached_count; i++) {
1652 ids = &video->attached_array[i];
1653 if ((ids->value.int_val & 0xffff) == device_id)
1654 return &ids->value.attrib;
1655 }
1656
1657 return NULL;
1658 }
1659
1660 static int
1661 acpi_video_bus_get_one_device(struct acpi_device *device,
1662 struct acpi_video_bus *video)
1663 {
1664 unsigned long long device_id;
1665 int status;
1666 struct acpi_video_device *data;
1667 struct acpi_video_device_attrib* attribute;
1668
1669 if (!device || !video)
1670 return -EINVAL;
1671
1672 status =
1673 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1674 if (ACPI_SUCCESS(status)) {
1675
1676 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1677 if (!data)
1678 return -ENOMEM;
1679
1680 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1681 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1682 device->driver_data = data;
1683
1684 data->device_id = device_id;
1685 data->video = video;
1686 data->dev = device;
1687
1688 attribute = acpi_video_get_device_attr(video, device_id);
1689
1690 if((attribute != NULL) && attribute->device_id_scheme) {
1691 switch (attribute->display_type) {
1692 case ACPI_VIDEO_DISPLAY_CRT:
1693 data->flags.crt = 1;
1694 break;
1695 case ACPI_VIDEO_DISPLAY_TV:
1696 data->flags.tvout = 1;
1697 break;
1698 case ACPI_VIDEO_DISPLAY_DVI:
1699 data->flags.dvi = 1;
1700 break;
1701 case ACPI_VIDEO_DISPLAY_LCD:
1702 data->flags.lcd = 1;
1703 break;
1704 default:
1705 data->flags.unknown = 1;
1706 break;
1707 }
1708 if(attribute->bios_can_detect)
1709 data->flags.bios = 1;
1710 } else
1711 data->flags.unknown = 1;
1712
1713 acpi_video_device_bind(video, data);
1714 acpi_video_device_find_cap(data);
1715
1716 status = acpi_install_notify_handler(device->handle,
1717 ACPI_DEVICE_NOTIFY,
1718 acpi_video_device_notify,
1719 data);
1720 if (ACPI_FAILURE(status)) {
1721 printk(KERN_ERR PREFIX
1722 "Error installing notify handler\n");
1723 if(data->brightness)
1724 kfree(data->brightness->levels);
1725 kfree(data->brightness);
1726 kfree(data);
1727 return -ENODEV;
1728 }
1729
1730 mutex_lock(&video->device_list_lock);
1731 list_add_tail(&data->entry, &video->video_device_list);
1732 mutex_unlock(&video->device_list_lock);
1733
1734 acpi_video_device_add_fs(device);
1735
1736 return 0;
1737 }
1738
1739 return -ENOENT;
1740 }
1741
1742 /*
1743 * Arg:
1744 * video : video bus device
1745 *
1746 * Return:
1747 * none
1748 *
1749 * Enumerate the video device list of the video bus,
1750 * bind the ids with the corresponding video devices
1751 * under the video bus.
1752 */
1753
1754 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1755 {
1756 struct acpi_video_device *dev;
1757
1758 mutex_lock(&video->device_list_lock);
1759
1760 list_for_each_entry(dev, &video->video_device_list, entry)
1761 acpi_video_device_bind(video, dev);
1762
1763 mutex_unlock(&video->device_list_lock);
1764 }
1765
1766 /*
1767 * Arg:
1768 * video : video bus device
1769 * device : video output device under the video
1770 * bus
1771 *
1772 * Return:
1773 * none
1774 *
1775 * Bind the ids with the corresponding video devices
1776 * under the video bus.
1777 */
1778
1779 static void
1780 acpi_video_device_bind(struct acpi_video_bus *video,
1781 struct acpi_video_device *device)
1782 {
1783 struct acpi_video_enumerated_device *ids;
1784 int i;
1785
1786 for (i = 0; i < video->attached_count; i++) {
1787 ids = &video->attached_array[i];
1788 if (device->device_id == (ids->value.int_val & 0xffff)) {
1789 ids->bind_info = device;
1790 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1791 }
1792 }
1793 }
1794
1795 /*
1796 * Arg:
1797 * video : video bus device
1798 *
1799 * Return:
1800 * < 0 : error
1801 *
1802 * Call _DOD to enumerate all devices attached to display adapter
1803 *
1804 */
1805
1806 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1807 {
1808 int status;
1809 int count;
1810 int i;
1811 struct acpi_video_enumerated_device *active_list;
1812 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1813 union acpi_object *dod = NULL;
1814 union acpi_object *obj;
1815
1816 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1817 if (!ACPI_SUCCESS(status)) {
1818 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1819 return status;
1820 }
1821
1822 dod = buffer.pointer;
1823 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1824 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1825 status = -EFAULT;
1826 goto out;
1827 }
1828
1829 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1830 dod->package.count));
1831
1832 active_list = kcalloc(1 + dod->package.count,
1833 sizeof(struct acpi_video_enumerated_device),
1834 GFP_KERNEL);
1835 if (!active_list) {
1836 status = -ENOMEM;
1837 goto out;
1838 }
1839
1840 count = 0;
1841 for (i = 0; i < dod->package.count; i++) {
1842 obj = &dod->package.elements[i];
1843
1844 if (obj->type != ACPI_TYPE_INTEGER) {
1845 printk(KERN_ERR PREFIX
1846 "Invalid _DOD data in element %d\n", i);
1847 continue;
1848 }
1849
1850 active_list[count].value.int_val = obj->integer.value;
1851 active_list[count].bind_info = NULL;
1852 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1853 (int)obj->integer.value));
1854 count++;
1855 }
1856
1857 kfree(video->attached_array);
1858
1859 video->attached_array = active_list;
1860 video->attached_count = count;
1861
1862 out:
1863 kfree(buffer.pointer);
1864 return status;
1865 }
1866
1867 static int
1868 acpi_video_get_next_level(struct acpi_video_device *device,
1869 u32 level_current, u32 event)
1870 {
1871 int min, max, min_above, max_below, i, l, delta = 255;
1872 max = max_below = 0;
1873 min = min_above = 255;
1874 /* Find closest level to level_current */
1875 for (i = 2; i < device->brightness->count; i++) {
1876 l = device->brightness->levels[i];
1877 if (abs(l - level_current) < abs(delta)) {
1878 delta = l - level_current;
1879 if (!delta)
1880 break;
1881 }
1882 }
1883 /* Ajust level_current to closest available level */
1884 level_current += delta;
1885 for (i = 2; i < device->brightness->count; i++) {
1886 l = device->brightness->levels[i];
1887 if (l < min)
1888 min = l;
1889 if (l > max)
1890 max = l;
1891 if (l < min_above && l > level_current)
1892 min_above = l;
1893 if (l > max_below && l < level_current)
1894 max_below = l;
1895 }
1896
1897 switch (event) {
1898 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1899 return (level_current < max) ? min_above : min;
1900 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1901 return (level_current < max) ? min_above : max;
1902 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1903 return (level_current > min) ? max_below : min;
1904 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1905 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1906 return 0;
1907 default:
1908 return level_current;
1909 }
1910 }
1911
1912 static int
1913 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1914 {
1915 unsigned long long level_current, level_next;
1916 int result = -EINVAL;
1917
1918 if (!device->brightness)
1919 goto out;
1920
1921 result = acpi_video_device_lcd_get_level_current(device,
1922 &level_current);
1923 if (result)
1924 goto out;
1925
1926 level_next = acpi_video_get_next_level(device, level_current, event);
1927
1928 result = acpi_video_device_lcd_set_level(device, level_next);
1929
1930 out:
1931 if (result)
1932 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1933
1934 return result;
1935 }
1936
1937 static int
1938 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1939 struct acpi_device *device)
1940 {
1941 int status = 0;
1942 struct acpi_device *dev;
1943
1944 acpi_video_device_enumerate(video);
1945
1946 list_for_each_entry(dev, &device->children, node) {
1947
1948 status = acpi_video_bus_get_one_device(dev, video);
1949 if (ACPI_FAILURE(status)) {
1950 printk(KERN_WARNING PREFIX
1951 "Cant attach device");
1952 continue;
1953 }
1954 }
1955 return status;
1956 }
1957
1958 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1959 {
1960 acpi_status status;
1961 struct acpi_video_bus *video;
1962
1963
1964 if (!device || !device->video)
1965 return -ENOENT;
1966
1967 video = device->video;
1968
1969 acpi_video_device_remove_fs(device->dev);
1970
1971 status = acpi_remove_notify_handler(device->dev->handle,
1972 ACPI_DEVICE_NOTIFY,
1973 acpi_video_device_notify);
1974 backlight_device_unregister(device->backlight);
1975 if (device->cdev) {
1976 sysfs_remove_link(&device->dev->dev.kobj,
1977 "thermal_cooling");
1978 sysfs_remove_link(&device->cdev->device.kobj,
1979 "device");
1980 thermal_cooling_device_unregister(device->cdev);
1981 device->cdev = NULL;
1982 }
1983 video_output_unregister(device->output_dev);
1984
1985 return 0;
1986 }
1987
1988 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1989 {
1990 int status;
1991 struct acpi_video_device *dev, *next;
1992
1993 mutex_lock(&video->device_list_lock);
1994
1995 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1996
1997 status = acpi_video_bus_put_one_device(dev);
1998 if (ACPI_FAILURE(status))
1999 printk(KERN_WARNING PREFIX
2000 "hhuuhhuu bug in acpi video driver.\n");
2001
2002 if (dev->brightness) {
2003 kfree(dev->brightness->levels);
2004 kfree(dev->brightness);
2005 }
2006 list_del(&dev->entry);
2007 kfree(dev);
2008 }
2009
2010 mutex_unlock(&video->device_list_lock);
2011
2012 return 0;
2013 }
2014
2015 /* acpi_video interface */
2016
2017 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
2018 {
2019 return acpi_video_bus_DOS(video, 0, 0);
2020 }
2021
2022 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
2023 {
2024 return acpi_video_bus_DOS(video, 0, 1);
2025 }
2026
2027 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
2028 {
2029 struct acpi_video_bus *video = acpi_driver_data(device);
2030 struct input_dev *input;
2031 int keycode;
2032
2033 if (!video)
2034 return;
2035
2036 input = video->input;
2037
2038 switch (event) {
2039 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
2040 * most likely via hotkey. */
2041 acpi_bus_generate_proc_event(device, event, 0);
2042 keycode = KEY_SWITCHVIDEOMODE;
2043 break;
2044
2045 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
2046 * connector. */
2047 acpi_video_device_enumerate(video);
2048 acpi_video_device_rebind(video);
2049 acpi_bus_generate_proc_event(device, event, 0);
2050 keycode = KEY_SWITCHVIDEOMODE;
2051 break;
2052
2053 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
2054 acpi_bus_generate_proc_event(device, event, 0);
2055 keycode = KEY_SWITCHVIDEOMODE;
2056 break;
2057 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
2058 acpi_bus_generate_proc_event(device, event, 0);
2059 keycode = KEY_VIDEO_NEXT;
2060 break;
2061 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
2062 acpi_bus_generate_proc_event(device, event, 0);
2063 keycode = KEY_VIDEO_PREV;
2064 break;
2065
2066 default:
2067 keycode = KEY_UNKNOWN;
2068 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2069 "Unsupported event [0x%x]\n", event));
2070 break;
2071 }
2072
2073 acpi_notifier_call_chain(device, event, 0);
2074 input_report_key(input, keycode, 1);
2075 input_sync(input);
2076 input_report_key(input, keycode, 0);
2077 input_sync(input);
2078
2079 return;
2080 }
2081
2082 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
2083 {
2084 struct acpi_video_device *video_device = data;
2085 struct acpi_device *device = NULL;
2086 struct acpi_video_bus *bus;
2087 struct input_dev *input;
2088 int keycode;
2089
2090 if (!video_device)
2091 return;
2092
2093 device = video_device->dev;
2094 bus = video_device->video;
2095 input = bus->input;
2096
2097 switch (event) {
2098 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
2099 if (brightness_switch_enabled)
2100 acpi_video_switch_brightness(video_device, event);
2101 acpi_bus_generate_proc_event(device, event, 0);
2102 keycode = KEY_BRIGHTNESS_CYCLE;
2103 break;
2104 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
2105 if (brightness_switch_enabled)
2106 acpi_video_switch_brightness(video_device, event);
2107 acpi_bus_generate_proc_event(device, event, 0);
2108 keycode = KEY_BRIGHTNESSUP;
2109 break;
2110 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
2111 if (brightness_switch_enabled)
2112 acpi_video_switch_brightness(video_device, event);
2113 acpi_bus_generate_proc_event(device, event, 0);
2114 keycode = KEY_BRIGHTNESSDOWN;
2115 break;
2116 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
2117 if (brightness_switch_enabled)
2118 acpi_video_switch_brightness(video_device, event);
2119 acpi_bus_generate_proc_event(device, event, 0);
2120 keycode = KEY_BRIGHTNESS_ZERO;
2121 break;
2122 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
2123 if (brightness_switch_enabled)
2124 acpi_video_switch_brightness(video_device, event);
2125 acpi_bus_generate_proc_event(device, event, 0);
2126 keycode = KEY_DISPLAY_OFF;
2127 break;
2128 default:
2129 keycode = KEY_UNKNOWN;
2130 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2131 "Unsupported event [0x%x]\n", event));
2132 break;
2133 }
2134
2135 acpi_notifier_call_chain(device, event, 0);
2136 input_report_key(input, keycode, 1);
2137 input_sync(input);
2138 input_report_key(input, keycode, 0);
2139 input_sync(input);
2140
2141 return;
2142 }
2143
2144 static int instance;
2145 static int acpi_video_resume(struct acpi_device *device)
2146 {
2147 struct acpi_video_bus *video;
2148 struct acpi_video_device *video_device;
2149 int i;
2150
2151 if (!device || !acpi_driver_data(device))
2152 return -EINVAL;
2153
2154 video = acpi_driver_data(device);
2155
2156 for (i = 0; i < video->attached_count; i++) {
2157 video_device = video->attached_array[i].bind_info;
2158 if (video_device && video_device->backlight)
2159 acpi_video_set_brightness(video_device->backlight);
2160 }
2161 return AE_OK;
2162 }
2163
2164 static int acpi_video_bus_add(struct acpi_device *device)
2165 {
2166 struct acpi_video_bus *video;
2167 struct input_dev *input;
2168 int error;
2169
2170 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2171 if (!video)
2172 return -ENOMEM;
2173
2174 /* a hack to fix the duplicate name "VID" problem on T61 */
2175 if (!strcmp(device->pnp.bus_id, "VID")) {
2176 if (instance)
2177 device->pnp.bus_id[3] = '0' + instance;
2178 instance ++;
2179 }
2180 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2181 if (!strcmp(device->pnp.bus_id, "VGA")) {
2182 if (instance)
2183 device->pnp.bus_id[3] = '0' + instance;
2184 instance++;
2185 }
2186
2187 video->device = device;
2188 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2189 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2190 device->driver_data = video;
2191
2192 acpi_video_bus_find_cap(video);
2193 error = acpi_video_bus_check(video);
2194 if (error)
2195 goto err_free_video;
2196
2197 error = acpi_video_bus_add_fs(device);
2198 if (error)
2199 goto err_free_video;
2200
2201 mutex_init(&video->device_list_lock);
2202 INIT_LIST_HEAD(&video->video_device_list);
2203
2204 acpi_video_bus_get_devices(video, device);
2205 acpi_video_bus_start_devices(video);
2206
2207 video->input = input = input_allocate_device();
2208 if (!input) {
2209 error = -ENOMEM;
2210 goto err_stop_video;
2211 }
2212
2213 snprintf(video->phys, sizeof(video->phys),
2214 "%s/video/input0", acpi_device_hid(video->device));
2215
2216 input->name = acpi_device_name(video->device);
2217 input->phys = video->phys;
2218 input->id.bustype = BUS_HOST;
2219 input->id.product = 0x06;
2220 input->dev.parent = &device->dev;
2221 input->evbit[0] = BIT(EV_KEY);
2222 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2223 set_bit(KEY_VIDEO_NEXT, input->keybit);
2224 set_bit(KEY_VIDEO_PREV, input->keybit);
2225 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2226 set_bit(KEY_BRIGHTNESSUP, input->keybit);
2227 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2228 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2229 set_bit(KEY_DISPLAY_OFF, input->keybit);
2230 set_bit(KEY_UNKNOWN, input->keybit);
2231
2232 error = input_register_device(input);
2233 if (error)
2234 goto err_free_input_dev;
2235
2236 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
2237 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2238 video->flags.multihead ? "yes" : "no",
2239 video->flags.rom ? "yes" : "no",
2240 video->flags.post ? "yes" : "no");
2241
2242 return 0;
2243
2244 err_free_input_dev:
2245 input_free_device(input);
2246 err_stop_video:
2247 acpi_video_bus_stop_devices(video);
2248 acpi_video_bus_put_devices(video);
2249 kfree(video->attached_array);
2250 acpi_video_bus_remove_fs(device);
2251 err_free_video:
2252 kfree(video);
2253 device->driver_data = NULL;
2254
2255 return error;
2256 }
2257
2258 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2259 {
2260 struct acpi_video_bus *video = NULL;
2261
2262
2263 if (!device || !acpi_driver_data(device))
2264 return -EINVAL;
2265
2266 video = acpi_driver_data(device);
2267
2268 acpi_video_bus_stop_devices(video);
2269 acpi_video_bus_put_devices(video);
2270 acpi_video_bus_remove_fs(device);
2271
2272 input_unregister_device(video->input);
2273 kfree(video->attached_array);
2274 kfree(video);
2275
2276 return 0;
2277 }
2278
2279 static int __init intel_opregion_present(void)
2280 {
2281 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
2282 struct pci_dev *dev = NULL;
2283 u32 address;
2284
2285 for_each_pci_dev(dev) {
2286 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2287 continue;
2288 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2289 continue;
2290 pci_read_config_dword(dev, 0xfc, &address);
2291 if (!address)
2292 continue;
2293 return 1;
2294 }
2295 #endif
2296 return 0;
2297 }
2298
2299 int acpi_video_register(void)
2300 {
2301 int result = 0;
2302
2303 acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2304 if (!acpi_video_dir)
2305 return -ENODEV;
2306
2307 result = acpi_bus_register_driver(&acpi_video_bus);
2308 if (result < 0) {
2309 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2310 return -ENODEV;
2311 }
2312
2313 return 0;
2314 }
2315 EXPORT_SYMBOL(acpi_video_register);
2316
2317 /*
2318 * This is kind of nasty. Hardware using Intel chipsets may require
2319 * the video opregion code to be run first in order to initialise
2320 * state before any ACPI video calls are made. To handle this we defer
2321 * registration of the video class until the opregion code has run.
2322 */
2323
2324 static int __init acpi_video_init(void)
2325 {
2326 dmi_check_system(video_dmi_table);
2327
2328 if (intel_opregion_present())
2329 return 0;
2330
2331 return acpi_video_register();
2332 }
2333
2334 static void __exit acpi_video_exit(void)
2335 {
2336
2337 acpi_bus_unregister_driver(&acpi_video_bus);
2338
2339 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2340
2341 return;
2342 }
2343
2344 module_init(acpi_video_init);
2345 module_exit(acpi_video_exit);
kernel source for telekom puls (alcatel/mediatek)