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On Tue, Nov 06, 2007 at 02:33:53AM -0800, akpm@linux-foundation.org wrote:
[mmotm.git] / drivers / acpi / video.c
blobf6e54bf8dd96e5d5767547bad753a22da03a52e0
1 /*
2 * video.c - ACPI Video Driver ($Revision:$)
3 *
4 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
5 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
6 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
7 *
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23 *
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 */
26
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/types.h>
31 #include <linux/list.h>
32 #include <linux/mutex.h>
33 #include <linux/proc_fs.h>
34 #include <linux/seq_file.h>
35 #include <linux/input.h>
36 #include <linux/backlight.h>
37 #include <linux/thermal.h>
38 #include <linux/video_output.h>
39 #include <linux/sort.h>
40 #include <linux/pci.h>
41 #include <linux/pci_ids.h>
42 #include <asm/uaccess.h>
43 #include <linux/dmi.h>
44 #include <acpi/acpi_bus.h>
45 #include <acpi/acpi_drivers.h>
46
47 #define PREFIX "ACPI: "
48
49 #define ACPI_VIDEO_CLASS "video"
50 #define ACPI_VIDEO_BUS_NAME "Video Bus"
51 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
52 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
53 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
54 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
55 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
56 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
57
58 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
59 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
60 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
61 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
62 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
63
64 #define MAX_NAME_LEN 20
65
66 #define ACPI_VIDEO_DISPLAY_CRT 1
67 #define ACPI_VIDEO_DISPLAY_TV 2
68 #define ACPI_VIDEO_DISPLAY_DVI 3
69 #define ACPI_VIDEO_DISPLAY_LCD 4
70
71 #define _COMPONENT ACPI_VIDEO_COMPONENT
72 ACPI_MODULE_NAME("video");
73
74 MODULE_AUTHOR("Bruno Ducrot");
75 MODULE_DESCRIPTION("ACPI Video Driver");
76 MODULE_LICENSE("GPL");
77
78 static int brightness_switch_enabled = 1;
79 module_param(brightness_switch_enabled, bool, 0644);
80
81 static int register_count = 0;
82 static int acpi_video_bus_add(struct acpi_device *device);
83 static int acpi_video_bus_remove(struct acpi_device *device, int type);
84 static int acpi_video_resume(struct acpi_device *device);
85 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
86
87 static const struct acpi_device_id video_device_ids[] = {
88 {ACPI_VIDEO_HID, 0},
89 {"", 0},
90 };
91 MODULE_DEVICE_TABLE(acpi, video_device_ids);
92
93 static struct acpi_driver acpi_video_bus = {
94 .name = "video",
95 .class = ACPI_VIDEO_CLASS,
96 .ids = video_device_ids,
97 .ops = {
98 .add = acpi_video_bus_add,
99 .remove = acpi_video_bus_remove,
100 .resume = acpi_video_resume,
101 .notify = acpi_video_bus_notify,
102 },
103 };
104
105 struct acpi_video_bus_flags {
106 u8 multihead:1; /* can switch video heads */
107 u8 rom:1; /* can retrieve a video rom */
108 u8 post:1; /* can configure the head to */
109 u8 reserved:5;
110 };
111
112 struct acpi_video_bus_cap {
113 u8 _DOS:1; /*Enable/Disable output switching */
114 u8 _DOD:1; /*Enumerate all devices attached to display adapter */
115 u8 _ROM:1; /*Get ROM Data */
116 u8 _GPD:1; /*Get POST Device */
117 u8 _SPD:1; /*Set POST Device */
118 u8 _VPO:1; /*Video POST Options */
119 u8 reserved:2;
120 };
121
122 struct acpi_video_device_attrib {
123 u32 display_index:4; /* A zero-based instance of the Display */
124 u32 display_port_attachment:4; /*This field differentiates the display type */
125 u32 display_type:4; /*Describe the specific type in use */
126 u32 vendor_specific:4; /*Chipset Vendor Specific */
127 u32 bios_can_detect:1; /*BIOS can detect the device */
128 u32 depend_on_vga:1; /*Non-VGA output device whose power is related to
129 the VGA device. */
130 u32 pipe_id:3; /*For VGA multiple-head devices. */
131 u32 reserved:10; /*Must be 0 */
132 u32 device_id_scheme:1; /*Device ID Scheme */
133 };
134
135 struct acpi_video_enumerated_device {
136 union {
137 u32 int_val;
138 struct acpi_video_device_attrib attrib;
139 } value;
140 struct acpi_video_device *bind_info;
141 };
142
143 struct acpi_video_bus {
144 struct acpi_device *device;
145 u8 dos_setting;
146 struct acpi_video_enumerated_device *attached_array;
147 u8 attached_count;
148 struct acpi_video_bus_cap cap;
149 struct acpi_video_bus_flags flags;
150 struct list_head video_device_list;
151 struct mutex device_list_lock; /* protects video_device_list */
152 struct proc_dir_entry *dir;
153 struct input_dev *input;
154 char phys[32]; /* for input device */
155 };
156
157 struct acpi_video_device_flags {
158 u8 crt:1;
159 u8 lcd:1;
160 u8 tvout:1;
161 u8 dvi:1;
162 u8 bios:1;
163 u8 unknown:1;
164 u8 reserved:2;
165 };
166
167 struct acpi_video_device_cap {
168 u8 _ADR:1; /*Return the unique ID */
169 u8 _BCL:1; /*Query list of brightness control levels supported */
170 u8 _BCM:1; /*Set the brightness level */
171 u8 _BQC:1; /* Get current brightness level */
172 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
173 u8 _DDC:1; /*Return the EDID for this device */
174 u8 _DCS:1; /*Return status of output device */
175 u8 _DGS:1; /*Query graphics state */
176 u8 _DSS:1; /*Device state set */
177 };
178
179 struct acpi_video_brightness_flags {
180 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
181 u8 _BCL_reversed:1; /* _BCL package is in a reversed order*/
182 u8 _BCL_use_index:1; /* levels in _BCL are index values */
183 u8 _BCM_use_index:1; /* input of _BCM is an index value */
184 u8 _BQC_use_index:1; /* _BQC returns an index value */
185 };
186
187 struct acpi_video_device_brightness {
188 int curr;
189 int count;
190 int *levels;
191 struct acpi_video_brightness_flags flags;
192 };
193
194 struct acpi_video_device {
195 unsigned long device_id;
196 struct acpi_video_device_flags flags;
197 struct acpi_video_device_cap cap;
198 struct list_head entry;
199 struct acpi_video_bus *video;
200 struct acpi_device *dev;
201 struct acpi_video_device_brightness *brightness;
202 struct backlight_device *backlight;
203 struct thermal_cooling_device *cooling_dev;
204 struct output_device *output_dev;
205 };
206
207 /* bus */
208 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
209 static const struct file_operations acpi_video_bus_info_fops = {
210 .owner = THIS_MODULE,
211 .open = acpi_video_bus_info_open_fs,
212 .read = seq_read,
213 .llseek = seq_lseek,
214 .release = single_release,
215 };
216
217 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
218 static const struct file_operations acpi_video_bus_ROM_fops = {
219 .owner = THIS_MODULE,
220 .open = acpi_video_bus_ROM_open_fs,
221 .read = seq_read,
222 .llseek = seq_lseek,
223 .release = single_release,
224 };
225
226 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
227 struct file *file);
228 static const struct file_operations acpi_video_bus_POST_info_fops = {
229 .owner = THIS_MODULE,
230 .open = acpi_video_bus_POST_info_open_fs,
231 .read = seq_read,
232 .llseek = seq_lseek,
233 .release = single_release,
234 };
235
236 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
237 static ssize_t acpi_video_bus_write_POST(struct file *file,
238 const char __user *buffer, size_t count, loff_t *data);
239 static const struct file_operations acpi_video_bus_POST_fops = {
240 .owner = THIS_MODULE,
241 .open = acpi_video_bus_POST_open_fs,
242 .read = seq_read,
243 .write = acpi_video_bus_write_POST,
244 .llseek = seq_lseek,
245 .release = single_release,
246 };
247
248 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
249 static ssize_t acpi_video_bus_write_DOS(struct file *file,
250 const char __user *buffer, size_t count, loff_t *data);
251 static const struct file_operations acpi_video_bus_DOS_fops = {
252 .owner = THIS_MODULE,
253 .open = acpi_video_bus_DOS_open_fs,
254 .read = seq_read,
255 .write = acpi_video_bus_write_DOS,
256 .llseek = seq_lseek,
257 .release = single_release,
258 };
259
260 /* device */
261 static int acpi_video_device_info_open_fs(struct inode *inode,
262 struct file *file);
263 static const struct file_operations acpi_video_device_info_fops = {
264 .owner = THIS_MODULE,
265 .open = acpi_video_device_info_open_fs,
266 .read = seq_read,
267 .llseek = seq_lseek,
268 .release = single_release,
269 };
270
271 static int acpi_video_device_state_open_fs(struct inode *inode,
272 struct file *file);
273 static ssize_t acpi_video_device_write_state(struct file *file,
274 const char __user *buffer, size_t count, loff_t *data);
275 static const struct file_operations acpi_video_device_state_fops = {
276 .owner = THIS_MODULE,
277 .open = acpi_video_device_state_open_fs,
278 .read = seq_read,
279 .write = acpi_video_device_write_state,
280 .llseek = seq_lseek,
281 .release = single_release,
282 };
283
284 static int acpi_video_device_brightness_open_fs(struct inode *inode,
285 struct file *file);
286 static ssize_t acpi_video_device_write_brightness(struct file *file,
287 const char __user *buffer, size_t count, loff_t *data);
288 static const struct file_operations acpi_video_device_brightness_fops = {
289 .owner = THIS_MODULE,
290 .open = acpi_video_device_brightness_open_fs,
291 .read = seq_read,
292 .write = acpi_video_device_write_brightness,
293 .llseek = seq_lseek,
294 .release = single_release,
295 };
296
297 static int acpi_video_device_EDID_open_fs(struct inode *inode,
298 struct file *file);
299 static const struct file_operations acpi_video_device_EDID_fops = {
300 .owner = THIS_MODULE,
301 .open = acpi_video_device_EDID_open_fs,
302 .read = seq_read,
303 .llseek = seq_lseek,
304 .release = single_release,
305 };
306
307 static const char device_decode[][30] = {
308 "motherboard VGA device",
309 "PCI VGA device",
310 "AGP VGA device",
311 "UNKNOWN",
312 };
313
314 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
315 static void acpi_video_device_rebind(struct acpi_video_bus *video);
316 static void acpi_video_device_bind(struct acpi_video_bus *video,
317 struct acpi_video_device *device);
318 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
319 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
320 int level);
321 static int acpi_video_device_lcd_get_level_current(
322 struct acpi_video_device *device,
323 unsigned long long *level);
324 static int acpi_video_get_next_level(struct acpi_video_device *device,
325 u32 level_current, u32 event);
326 static int acpi_video_switch_brightness(struct acpi_video_device *device,
327 int event);
328 static int acpi_video_device_get_state(struct acpi_video_device *device,
329 unsigned long long *state);
330 static int acpi_video_output_get(struct output_device *od);
331 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
332
333 /*backlight device sysfs support*/
334 static int acpi_video_get_brightness(struct backlight_device *bd)
335 {
336 unsigned long long cur_level;
337 int i;
338 struct acpi_video_device *vd =
339 (struct acpi_video_device *)bl_get_data(bd);
340
341 if (acpi_video_device_lcd_get_level_current(vd, &cur_level))
342 return -EINVAL;
343 for (i = 2; i < vd->brightness->count; i++) {
344 if (vd->brightness->levels[i] == cur_level)
345 /* The first two entries are special - see page 575
346 of the ACPI spec 3.0 */
347 return i-2;
348 }
349 return 0;
350 }
351
352 static int acpi_video_set_brightness(struct backlight_device *bd)
353 {
354 int request_level = bd->props.brightness + 2;
355 struct acpi_video_device *vd =
356 (struct acpi_video_device *)bl_get_data(bd);
357
358 return acpi_video_device_lcd_set_level(vd,
359 vd->brightness->levels[request_level]);
360 }
361
362 static struct backlight_ops acpi_backlight_ops = {
363 .get_brightness = acpi_video_get_brightness,
364 .update_status = acpi_video_set_brightness,
365 };
366
367 /*video output device sysfs support*/
368 static int acpi_video_output_get(struct output_device *od)
369 {
370 unsigned long long state;
371 struct acpi_video_device *vd =
372 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
373 acpi_video_device_get_state(vd, &state);
374 return (int)state;
375 }
376
377 static int acpi_video_output_set(struct output_device *od)
378 {
379 unsigned long state = od->request_state;
380 struct acpi_video_device *vd=
381 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
382 return acpi_video_device_set_state(vd, state);
383 }
384
385 static struct output_properties acpi_output_properties = {
386 .set_state = acpi_video_output_set,
387 .get_status = acpi_video_output_get,
388 };
389
390
391 /* thermal cooling device callbacks */
392 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
393 long *state)
394 {
395 struct acpi_device *device = cooling_dev->devdata;
396 struct acpi_video_device *video = acpi_driver_data(device);
397
398 *state = video->brightness->count - 3;
399 return 0;
400 }
401
402 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
403 long *state)
404 {
405 struct acpi_device *device = cooling_dev->devdata;
406 struct acpi_video_device *video = acpi_driver_data(device);
407 unsigned long long level;
408 int offset;
409
410 if (acpi_video_device_lcd_get_level_current(video, &level))
411 return -EINVAL;
412 for (offset = 2; offset < video->brightness->count; offset++)
413 if (level == video->brightness->levels[offset]) {
414 *state = video->brightness->count - offset - 1;
415 return 0;
416 }
417
418 return -EINVAL;
419 }
420
421 static int
422 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
423 {
424 struct acpi_device *device = cooling_dev->devdata;
425 struct acpi_video_device *video = acpi_driver_data(device);
426 int level;
427
428 if ( state >= video->brightness->count - 2)
429 return -EINVAL;
430
431 state = video->brightness->count - state;
432 level = video->brightness->levels[state -1];
433 return acpi_video_device_lcd_set_level(video, level);
434 }
435
436 static struct thermal_cooling_device_ops video_cooling_ops = {
437 .get_max_state = video_get_max_state,
438 .get_cur_state = video_get_cur_state,
439 .set_cur_state = video_set_cur_state,
440 };
441
442 /* --------------------------------------------------------------------------
443 Video Management
444 -------------------------------------------------------------------------- */
445
446 /* device */
447
448 static int
449 acpi_video_device_query(struct acpi_video_device *device, unsigned long long *state)
450 {
451 int status;
452
453 status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
454
455 return status;
456 }
457
458 static int
459 acpi_video_device_get_state(struct acpi_video_device *device,
460 unsigned long long *state)
461 {
462 int status;
463
464 status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
465
466 return status;
467 }
468
469 static int
470 acpi_video_device_set_state(struct acpi_video_device *device, int state)
471 {
472 int status;
473 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
474 struct acpi_object_list args = { 1, &arg0 };
475 unsigned long long ret;
476
477
478 arg0.integer.value = state;
479 status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
480
481 return status;
482 }
483
484 static int
485 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
486 union acpi_object **levels)
487 {
488 int status;
489 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
490 union acpi_object *obj;
491
492
493 *levels = NULL;
494
495 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
496 if (!ACPI_SUCCESS(status))
497 return status;
498 obj = (union acpi_object *)buffer.pointer;
499 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
500 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
501 status = -EFAULT;
502 goto err;
503 }
504
505 *levels = obj;
506
507 return 0;
508
509 err:
510 kfree(buffer.pointer);
511
512 return status;
513 }
514
515 static int
516 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
517 {
518 int status;
519 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
520 struct acpi_object_list args = { 1, &arg0 };
521 int state;
522
523 arg0.integer.value = level;
524
525 status = acpi_evaluate_object(device->dev->handle, "_BCM",
526 &args, NULL);
527 if (ACPI_FAILURE(status)) {
528 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
529 return -EIO;
530 }
531
532 device->brightness->curr = level;
533 for (state = 2; state < device->brightness->count; state++)
534 if (level == device->brightness->levels[state]) {
535 if (device->backlight)
536 device->backlight->props.brightness = state - 2;
537 return 0;
538 }
539
540 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
541 return -EINVAL;
542 }
543
544 /*
545 * For some buggy _BQC methods, we need to add a constant value to
546 * the _BQC return value to get the actual current brightness level
547 */
548
549 static int bqc_offset_aml_bug_workaround;
550 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
551 {
552 bqc_offset_aml_bug_workaround = 9;
553 return 0;
554 }
555
556 static struct dmi_system_id video_dmi_table[] __initdata = {
557 /*
558 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
559 */
560 {
561 .callback = video_set_bqc_offset,
562 .ident = "Acer Aspire 5720",
563 .matches = {
564 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
565 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
566 },
567 },
568 {
569 .callback = video_set_bqc_offset,
570 .ident = "Acer Aspire 5710Z",
571 .matches = {
572 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
573 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
574 },
575 },
576 {
577 .callback = video_set_bqc_offset,
578 .ident = "eMachines E510",
579 .matches = {
580 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
581 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
582 },
583 },
584 {
585 .callback = video_set_bqc_offset,
586 .ident = "Acer Aspire 5315",
587 .matches = {
588 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
589 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
590 },
591 },
592 {
593 .callback = video_set_bqc_offset,
594 .ident = "Acer Aspire 7720",
595 .matches = {
596 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
597 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
598 },
599 },
600 {}
601 };
602
603 static int
604 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
605 unsigned long long *level)
606 {
607 acpi_status status = AE_OK;
608 int i;
609
610 if (device->cap._BQC || device->cap._BCQ) {
611 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
612
613 status = acpi_evaluate_integer(device->dev->handle, buf,
614 NULL, level);
615 if (ACPI_SUCCESS(status)) {
616 if (device->brightness->flags._BQC_use_index) {
617 if (device->brightness->flags._BCL_reversed)
618 *level = device->brightness->count
619 - 3 - (*level);
620 *level = device->brightness->levels[*level + 2];
621
622 }
623 *level += bqc_offset_aml_bug_workaround;
624 for (i = 2; i < device->brightness->count; i++)
625 if (device->brightness->levels[i] == *level) {
626 device->brightness->curr = *level;
627 return 0;
628 }
629 /* BQC returned an invalid level. Stop using it. */
630 ACPI_WARNING((AE_INFO, "%s returned an invalid level",
631 buf));
632 device->cap._BQC = device->cap._BCQ = 0;
633 } else {
634 /* Fixme:
635 * should we return an error or ignore this failure?
636 * dev->brightness->curr is a cached value which stores
637 * the correct current backlight level in most cases.
638 * ACPI video backlight still works w/ buggy _BQC.
639 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
640 */
641 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
642 device->cap._BQC = device->cap._BCQ = 0;
643 }
644 }
645
646 *level = device->brightness->curr;
647 return 0;
648 }
649
650 static int
651 acpi_video_device_EDID(struct acpi_video_device *device,
652 union acpi_object **edid, ssize_t length)
653 {
654 int status;
655 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
656 union acpi_object *obj;
657 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
658 struct acpi_object_list args = { 1, &arg0 };
659
660
661 *edid = NULL;
662
663 if (!device)
664 return -ENODEV;
665 if (length == 128)
666 arg0.integer.value = 1;
667 else if (length == 256)
668 arg0.integer.value = 2;
669 else
670 return -EINVAL;
671
672 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
673 if (ACPI_FAILURE(status))
674 return -ENODEV;
675
676 obj = buffer.pointer;
677
678 if (obj && obj->type == ACPI_TYPE_BUFFER)
679 *edid = obj;
680 else {
681 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
682 status = -EFAULT;
683 kfree(obj);
684 }
685
686 return status;
687 }
688
689 /* bus */
690
691 static int
692 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
693 {
694 int status;
695 unsigned long long tmp;
696 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
697 struct acpi_object_list args = { 1, &arg0 };
698
699
700 arg0.integer.value = option;
701
702 status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
703 if (ACPI_SUCCESS(status))
704 status = tmp ? (-EINVAL) : (AE_OK);
705
706 return status;
707 }
708
709 static int
710 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long long *id)
711 {
712 int status;
713
714 status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
715
716 return status;
717 }
718
719 static int
720 acpi_video_bus_POST_options(struct acpi_video_bus *video,
721 unsigned long long *options)
722 {
723 int status;
724
725 status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
726 *options &= 3;
727
728 return status;
729 }
730
731 /*
732 * Arg:
733 * video : video bus device pointer
734 * bios_flag :
735 * 0. The system BIOS should NOT automatically switch(toggle)
736 * the active display output.
737 * 1. The system BIOS should automatically switch (toggle) the
738 * active display output. No switch event.
739 * 2. The _DGS value should be locked.
740 * 3. The system BIOS should not automatically switch (toggle) the
741 * active display output, but instead generate the display switch
742 * event notify code.
743 * lcd_flag :
744 * 0. The system BIOS should automatically control the brightness level
745 * of the LCD when the power changes from AC to DC
746 * 1. The system BIOS should NOT automatically control the brightness
747 * level of the LCD when the power changes from AC to DC.
748 * Return Value:
749 * -1 wrong arg.
750 */
751
752 static int
753 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
754 {
755 acpi_integer status = 0;
756 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
757 struct acpi_object_list args = { 1, &arg0 };
758
759
760 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
761 status = -1;
762 goto Failed;
763 }
764 arg0.integer.value = (lcd_flag << 2) | bios_flag;
765 video->dos_setting = arg0.integer.value;
766 acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
767
768 Failed:
769 return status;
770 }
771
772 /*
773 * Simple comparison function used to sort backlight levels.
774 */
775
776 static int
777 acpi_video_cmp_level(const void *a, const void *b)
778 {
779 return *(int *)a - *(int *)b;
780 }
781
782 /*
783 * Arg:
784 * device : video output device (LCD, CRT, ..)
785 *
786 * Return Value:
787 * Maximum brightness level
788 *
789 * Allocate and initialize device->brightness.
790 */
791
792 static int
793 acpi_video_init_brightness(struct acpi_video_device *device)
794 {
795 union acpi_object *obj = NULL;
796 int i, max_level = 0, count = 0, level_ac_battery = 0;
797 unsigned long long level, level_old;
798 union acpi_object *o;
799 struct acpi_video_device_brightness *br = NULL;
800 int result = -EINVAL;
801
802 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
803 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
804 "LCD brightness level\n"));
805 goto out;
806 }
807
808 if (obj->package.count < 2)
809 goto out;
810
811 br = kzalloc(sizeof(*br), GFP_KERNEL);
812 if (!br) {
813 printk(KERN_ERR "can't allocate memory\n");
814 result = -ENOMEM;
815 goto out;
816 }
817
818 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
819 GFP_KERNEL);
820 if (!br->levels) {
821 result = -ENOMEM;
822 goto out_free;
823 }
824
825 for (i = 0; i < obj->package.count; i++) {
826 o = (union acpi_object *)&obj->package.elements[i];
827 if (o->type != ACPI_TYPE_INTEGER) {
828 printk(KERN_ERR PREFIX "Invalid data\n");
829 continue;
830 }
831 br->levels[count] = (u32) o->integer.value;
832
833 if (br->levels[count] > max_level)
834 max_level = br->levels[count];
835 count++;
836 }
837
838 /*
839 * some buggy BIOS don't export the levels
840 * when machine is on AC/Battery in _BCL package.
841 * In this case, the first two elements in _BCL packages
842 * are also supported brightness levels that OS should take care of.
843 */
844 for (i = 2; i < count; i++) {
845 if (br->levels[i] == br->levels[0])
846 level_ac_battery++;
847 if (br->levels[i] == br->levels[1])
848 level_ac_battery++;
849 }
850
851 if (level_ac_battery < 2) {
852 level_ac_battery = 2 - level_ac_battery;
853 br->flags._BCL_no_ac_battery_levels = 1;
854 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
855 br->levels[i] = br->levels[i - level_ac_battery];
856 count += level_ac_battery;
857 } else if (level_ac_battery > 2)
858 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
859
860 /* Check if the _BCL package is in a reversed order */
861 if (max_level == br->levels[2]) {
862 br->flags._BCL_reversed = 1;
863 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
864 acpi_video_cmp_level, NULL);
865 } else if (max_level != br->levels[count - 1])
866 ACPI_ERROR((AE_INFO,
867 "Found unordered _BCL package\n"));
868
869 br->count = count;
870 device->brightness = br;
871
872 /* Check the input/output of _BQC/_BCL/_BCM */
873 if ((max_level < 100) && (max_level <= (count - 2)))
874 br->flags._BCL_use_index = 1;
875
876 /*
877 * _BCM is always consistent with _BCL,
878 * at least for all the laptops we have ever seen.
879 */
880 br->flags._BCM_use_index = br->flags._BCL_use_index;
881
882 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
883 br->curr = level = max_level;
884
885 if (!device->cap._BQC)
886 goto set_level;
887
888 result = acpi_video_device_lcd_get_level_current(device, &level_old);
889 if (result)
890 goto out_free_levels;
891
892 /*
893 * Set the level to maximum and check if _BQC uses indexed value
894 */
895 result = acpi_video_device_lcd_set_level(device, max_level);
896 if (result)
897 goto out_free_levels;
898
899 result = acpi_video_device_lcd_get_level_current(device, &level);
900 if (result)
901 goto out_free_levels;
902
903 br->flags._BQC_use_index = (level == max_level ? 0 : 1);
904
905 if (!br->flags._BQC_use_index) {
906 /*
907 * Set the backlight to the initial state.
908 * On some buggy laptops, _BQC returns an uninitialized value
909 * when invoked for the first time, i.e. level_old is invalid.
910 * set the backlight to max_level in this case
911 */
912 for (i = 2; i < br->count; i++)
913 if (level_old == br->levels[i])
914 level = level_old;
915 goto set_level;
916 }
917
918 if (br->flags._BCL_reversed)
919 level_old = (br->count - 1) - level_old;
920 level = br->levels[level_old];
921
922 set_level:
923 result = acpi_video_device_lcd_set_level(device, level);
924 if (result)
925 goto out_free_levels;
926
927 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
928 "found %d brightness levels\n", count - 2));
929 kfree(obj);
930 return result;
931
932 out_free_levels:
933 kfree(br->levels);
934 out_free:
935 kfree(br);
936 out:
937 device->brightness = NULL;
938 kfree(obj);
939 return result;
940 }
941
942 /*
943 * Arg:
944 * device : video output device (LCD, CRT, ..)
945 *
946 * Return Value:
947 * None
948 *
949 * Find out all required AML methods defined under the output
950 * device.
951 */
952
953 static void acpi_video_device_find_cap(struct acpi_video_device *device)
954 {
955 acpi_handle h_dummy1;
956
957 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
958 device->cap._ADR = 1;
959 }
960 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
961 device->cap._BCL = 1;
962 }
963 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
964 device->cap._BCM = 1;
965 }
966 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
967 device->cap._BQC = 1;
968 else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
969 &h_dummy1))) {
970 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
971 device->cap._BCQ = 1;
972 }
973
974 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
975 device->cap._DDC = 1;
976 }
977 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
978 device->cap._DCS = 1;
979 }
980 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
981 device->cap._DGS = 1;
982 }
983 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
984 device->cap._DSS = 1;
985 }
986
987 if (acpi_video_backlight_support()) {
988 int result;
989 static int count = 0;
990 char *name;
991
992 result = acpi_video_init_brightness(device);
993 if (result)
994 return;
995 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
996 if (!name)
997 return;
998
999 sprintf(name, "acpi_video%d", count++);
1000 device->backlight = backlight_device_register(name,
1001 NULL, device, &acpi_backlight_ops);
1002 device->backlight->props.max_brightness = device->brightness->count-3;
1003 kfree(name);
1004
1005 result = sysfs_create_link(&device->backlight->dev.kobj,
1006 &device->dev->dev.kobj, "device");
1007 if (result)
1008 printk(KERN_ERR PREFIX "Create sysfs link\n");
1009
1010 device->cooling_dev = thermal_cooling_device_register("LCD",
1011 device->dev, &video_cooling_ops);
1012 if (IS_ERR(device->cooling_dev)) {
1013 /*
1014 * Set cooling_dev to NULL so we don't crash trying to
1015 * free it.
1016 * Also, why the hell we are returning early and
1017 * not attempt to register video output if cooling
1018 * device registration failed?
1019 * -- dtor
1020 */
1021 device->cooling_dev = NULL;
1022 return;
1023 }
1024
1025 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1026 device->cooling_dev->id);
1027 result = sysfs_create_link(&device->dev->dev.kobj,
1028 &device->cooling_dev->device.kobj,
1029 "thermal_cooling");
1030 if (result)
1031 printk(KERN_ERR PREFIX "Create sysfs link\n");
1032 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1033 &device->dev->dev.kobj, "device");
1034 if (result)
1035 printk(KERN_ERR PREFIX "Create sysfs link\n");
1036
1037 }
1038
1039 if (acpi_video_display_switch_support()) {
1040
1041 if (device->cap._DCS && device->cap._DSS) {
1042 static int count;
1043 char *name;
1044 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
1045 if (!name)
1046 return;
1047 sprintf(name, "acpi_video%d", count++);
1048 device->output_dev = video_output_register(name,
1049 NULL, device, &acpi_output_properties);
1050 kfree(name);
1051 }
1052 }
1053 }
1054
1055 /*
1056 * Arg:
1057 * device : video output device (VGA)
1058 *
1059 * Return Value:
1060 * None
1061 *
1062 * Find out all required AML methods defined under the video bus device.
1063 */
1064
1065 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1066 {
1067 acpi_handle h_dummy1;
1068
1069 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
1070 video->cap._DOS = 1;
1071 }
1072 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
1073 video->cap._DOD = 1;
1074 }
1075 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
1076 video->cap._ROM = 1;
1077 }
1078 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
1079 video->cap._GPD = 1;
1080 }
1081 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
1082 video->cap._SPD = 1;
1083 }
1084 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
1085 video->cap._VPO = 1;
1086 }
1087 }
1088
1089 /*
1090 * Check whether the video bus device has required AML method to
1091 * support the desired features
1092 */
1093
1094 static int acpi_video_bus_check(struct acpi_video_bus *video)
1095 {
1096 acpi_status status = -ENOENT;
1097 struct pci_dev *dev;
1098
1099 if (!video)
1100 return -EINVAL;
1101
1102 dev = acpi_get_pci_dev(video->device->handle);
1103 if (!dev)
1104 return -ENODEV;
1105 pci_dev_put(dev);
1106
1107 /* Since there is no HID, CID and so on for VGA driver, we have
1108 * to check well known required nodes.
1109 */
1110
1111 /* Does this device support video switching? */
1112 if (video->cap._DOS) {
1113 video->flags.multihead = 1;
1114 status = 0;
1115 }
1116
1117 /* Does this device support retrieving a video ROM? */
1118 if (video->cap._ROM) {
1119 video->flags.rom = 1;
1120 status = 0;
1121 }
1122
1123 /* Does this device support configuring which video device to POST? */
1124 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1125 video->flags.post = 1;
1126 status = 0;
1127 }
1128
1129 return status;
1130 }
1131
1132 /* --------------------------------------------------------------------------
1133 FS Interface (/proc)
1134 -------------------------------------------------------------------------- */
1135
1136 static struct proc_dir_entry *acpi_video_dir;
1137
1138 /* video devices */
1139
1140 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
1141 {
1142 struct acpi_video_device *dev = seq->private;
1143
1144
1145 if (!dev)
1146 goto end;
1147
1148 seq_printf(seq, "device_id: 0x%04x\n", (u32) dev->device_id);
1149 seq_printf(seq, "type: ");
1150 if (dev->flags.crt)
1151 seq_printf(seq, "CRT\n");
1152 else if (dev->flags.lcd)
1153 seq_printf(seq, "LCD\n");
1154 else if (dev->flags.tvout)
1155 seq_printf(seq, "TVOUT\n");
1156 else if (dev->flags.dvi)
1157 seq_printf(seq, "DVI\n");
1158 else
1159 seq_printf(seq, "UNKNOWN\n");
1160
1161 seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
1162
1163 end:
1164 return 0;
1165 }
1166
1167 static int
1168 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
1169 {
1170 return single_open(file, acpi_video_device_info_seq_show,
1171 PDE(inode)->data);
1172 }
1173
1174 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
1175 {
1176 int status;
1177 struct acpi_video_device *dev = seq->private;
1178 unsigned long long state;
1179
1180
1181 if (!dev)
1182 goto end;
1183
1184 status = acpi_video_device_get_state(dev, &state);
1185 seq_printf(seq, "state: ");
1186 if (ACPI_SUCCESS(status))
1187 seq_printf(seq, "0x%02llx\n", state);
1188 else
1189 seq_printf(seq, "<not supported>\n");
1190
1191 status = acpi_video_device_query(dev, &state);
1192 seq_printf(seq, "query: ");
1193 if (ACPI_SUCCESS(status))
1194 seq_printf(seq, "0x%02llx\n", state);
1195 else
1196 seq_printf(seq, "<not supported>\n");
1197
1198 end:
1199 return 0;
1200 }
1201
1202 static int
1203 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
1204 {
1205 return single_open(file, acpi_video_device_state_seq_show,
1206 PDE(inode)->data);
1207 }
1208
1209 static ssize_t
1210 acpi_video_device_write_state(struct file *file,
1211 const char __user * buffer,
1212 size_t count, loff_t * data)
1213 {
1214 int status;
1215 struct seq_file *m = file->private_data;
1216 struct acpi_video_device *dev = m->private;
1217 char str[12] = { 0 };
1218 u32 state = 0;
1219
1220
1221 if (!dev || count + 1 > sizeof str)
1222 return -EINVAL;
1223
1224 if (copy_from_user(str, buffer, count))
1225 return -EFAULT;
1226
1227 str[count] = 0;
1228 state = simple_strtoul(str, NULL, 0);
1229 state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
1230
1231 status = acpi_video_device_set_state(dev, state);
1232
1233 if (status)
1234 return -EFAULT;
1235
1236 return count;
1237 }
1238
1239 static int
1240 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
1241 {
1242 struct acpi_video_device *dev = seq->private;
1243 int i;
1244
1245
1246 if (!dev || !dev->brightness) {
1247 seq_printf(seq, "<not supported>\n");
1248 return 0;
1249 }
1250
1251 seq_printf(seq, "levels: ");
1252 for (i = 2; i < dev->brightness->count; i++)
1253 seq_printf(seq, " %d", dev->brightness->levels[i]);
1254 seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
1255
1256 return 0;
1257 }
1258
1259 static int
1260 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1261 {
1262 return single_open(file, acpi_video_device_brightness_seq_show,
1263 PDE(inode)->data);
1264 }
1265
1266 static ssize_t
1267 acpi_video_device_write_brightness(struct file *file,
1268 const char __user * buffer,
1269 size_t count, loff_t * data)
1270 {
1271 struct seq_file *m = file->private_data;
1272 struct acpi_video_device *dev = m->private;
1273 char str[5] = { 0 };
1274 unsigned int level = 0;
1275 int i;
1276
1277
1278 if (!dev || !dev->brightness || count + 1 > sizeof str)
1279 return -EINVAL;
1280
1281 if (copy_from_user(str, buffer, count))
1282 return -EFAULT;
1283
1284 str[count] = 0;
1285 level = simple_strtoul(str, NULL, 0);
1286
1287 if (level > 100)
1288 return -EFAULT;
1289
1290 /* validate through the list of available levels */
1291 for (i = 2; i < dev->brightness->count; i++)
1292 if (level == dev->brightness->levels[i]) {
1293 if (!acpi_video_device_lcd_set_level(dev, level))
1294 return count;
1295 break;
1296 }
1297
1298 return -EINVAL;
1299 }
1300
1301 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1302 {
1303 struct acpi_video_device *dev = seq->private;
1304 int status;
1305 int i;
1306 union acpi_object *edid = NULL;
1307
1308
1309 if (!dev)
1310 goto out;
1311
1312 status = acpi_video_device_EDID(dev, &edid, 128);
1313 if (ACPI_FAILURE(status)) {
1314 status = acpi_video_device_EDID(dev, &edid, 256);
1315 }
1316
1317 if (ACPI_FAILURE(status)) {
1318 goto out;
1319 }
1320
1321 if (edid && edid->type == ACPI_TYPE_BUFFER) {
1322 for (i = 0; i < edid->buffer.length; i++)
1323 seq_putc(seq, edid->buffer.pointer[i]);
1324 }
1325
1326 out:
1327 if (!edid)
1328 seq_printf(seq, "<not supported>\n");
1329 else
1330 kfree(edid);
1331
1332 return 0;
1333 }
1334
1335 static int
1336 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1337 {
1338 return single_open(file, acpi_video_device_EDID_seq_show,
1339 PDE(inode)->data);
1340 }
1341
1342 static int acpi_video_device_add_fs(struct acpi_device *device)
1343 {
1344 struct proc_dir_entry *entry, *device_dir;
1345 struct acpi_video_device *vid_dev;
1346
1347 vid_dev = acpi_driver_data(device);
1348 if (!vid_dev)
1349 return -ENODEV;
1350
1351 device_dir = proc_mkdir(acpi_device_bid(device),
1352 vid_dev->video->dir);
1353 if (!device_dir)
1354 return -ENOMEM;
1355
1356 /* 'info' [R] */
1357 entry = proc_create_data("info", S_IRUGO, device_dir,
1358 &acpi_video_device_info_fops, acpi_driver_data(device));
1359 if (!entry)
1360 goto err_remove_dir;
1361
1362 /* 'state' [R/W] */
1363 entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1364 device_dir,
1365 &acpi_video_device_state_fops,
1366 acpi_driver_data(device));
1367 if (!entry)
1368 goto err_remove_info;
1369
1370 /* 'brightness' [R/W] */
1371 entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1372 device_dir,
1373 &acpi_video_device_brightness_fops,
1374 acpi_driver_data(device));
1375 if (!entry)
1376 goto err_remove_state;
1377
1378 /* 'EDID' [R] */
1379 entry = proc_create_data("EDID", S_IRUGO, device_dir,
1380 &acpi_video_device_EDID_fops,
1381 acpi_driver_data(device));
1382 if (!entry)
1383 goto err_remove_brightness;
1384
1385 acpi_device_dir(device) = device_dir;
1386
1387 return 0;
1388
1389 err_remove_brightness:
1390 remove_proc_entry("brightness", device_dir);
1391 err_remove_state:
1392 remove_proc_entry("state", device_dir);
1393 err_remove_info:
1394 remove_proc_entry("info", device_dir);
1395 err_remove_dir:
1396 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1397 return -ENOMEM;
1398 }
1399
1400 static int acpi_video_device_remove_fs(struct acpi_device *device)
1401 {
1402 struct acpi_video_device *vid_dev;
1403 struct proc_dir_entry *device_dir;
1404
1405 vid_dev = acpi_driver_data(device);
1406 if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1407 return -ENODEV;
1408
1409 device_dir = acpi_device_dir(device);
1410 if (device_dir) {
1411 remove_proc_entry("info", device_dir);
1412 remove_proc_entry("state", device_dir);
1413 remove_proc_entry("brightness", device_dir);
1414 remove_proc_entry("EDID", device_dir);
1415 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1416 acpi_device_dir(device) = NULL;
1417 }
1418
1419 return 0;
1420 }
1421
1422 /* video bus */
1423 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1424 {
1425 struct acpi_video_bus *video = seq->private;
1426
1427
1428 if (!video)
1429 goto end;
1430
1431 seq_printf(seq, "Switching heads: %s\n",
1432 video->flags.multihead ? "yes" : "no");
1433 seq_printf(seq, "Video ROM: %s\n",
1434 video->flags.rom ? "yes" : "no");
1435 seq_printf(seq, "Device to be POSTed on boot: %s\n",
1436 video->flags.post ? "yes" : "no");
1437
1438 end:
1439 return 0;
1440 }
1441
1442 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1443 {
1444 return single_open(file, acpi_video_bus_info_seq_show,
1445 PDE(inode)->data);
1446 }
1447
1448 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1449 {
1450 struct acpi_video_bus *video = seq->private;
1451
1452
1453 if (!video)
1454 goto end;
1455
1456 printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1457 seq_printf(seq, "<TODO>\n");
1458
1459 end:
1460 return 0;
1461 }
1462
1463 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1464 {
1465 return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1466 }
1467
1468 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1469 {
1470 struct acpi_video_bus *video = seq->private;
1471 unsigned long long options;
1472 int status;
1473
1474
1475 if (!video)
1476 goto end;
1477
1478 status = acpi_video_bus_POST_options(video, &options);
1479 if (ACPI_SUCCESS(status)) {
1480 if (!(options & 1)) {
1481 printk(KERN_WARNING PREFIX
1482 "The motherboard VGA device is not listed as a possible POST device.\n");
1483 printk(KERN_WARNING PREFIX
1484 "This indicates a BIOS bug. Please contact the manufacturer.\n");
1485 }
1486 printk(KERN_WARNING "%llx\n", options);
1487 seq_printf(seq, "can POST: <integrated video>");
1488 if (options & 2)
1489 seq_printf(seq, " <PCI video>");
1490 if (options & 4)
1491 seq_printf(seq, " <AGP video>");
1492 seq_putc(seq, '\n');
1493 } else
1494 seq_printf(seq, "<not supported>\n");
1495 end:
1496 return 0;
1497 }
1498
1499 static int
1500 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1501 {
1502 return single_open(file, acpi_video_bus_POST_info_seq_show,
1503 PDE(inode)->data);
1504 }
1505
1506 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1507 {
1508 struct acpi_video_bus *video = seq->private;
1509 int status;
1510 unsigned long long id;
1511
1512
1513 if (!video)
1514 goto end;
1515
1516 status = acpi_video_bus_get_POST(video, &id);
1517 if (!ACPI_SUCCESS(status)) {
1518 seq_printf(seq, "<not supported>\n");
1519 goto end;
1520 }
1521 seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1522
1523 end:
1524 return 0;
1525 }
1526
1527 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1528 {
1529 struct acpi_video_bus *video = seq->private;
1530
1531
1532 seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1533
1534 return 0;
1535 }
1536
1537 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1538 {
1539 return single_open(file, acpi_video_bus_POST_seq_show,
1540 PDE(inode)->data);
1541 }
1542
1543 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1544 {
1545 return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1546 }
1547
1548 static ssize_t
1549 acpi_video_bus_write_POST(struct file *file,
1550 const char __user * buffer,
1551 size_t count, loff_t * data)
1552 {
1553 int status;
1554 struct seq_file *m = file->private_data;
1555 struct acpi_video_bus *video = m->private;
1556 char str[12] = { 0 };
1557 unsigned long long opt, options;
1558
1559
1560 if (!video || count + 1 > sizeof str)
1561 return -EINVAL;
1562
1563 status = acpi_video_bus_POST_options(video, &options);
1564 if (!ACPI_SUCCESS(status))
1565 return -EINVAL;
1566
1567 if (copy_from_user(str, buffer, count))
1568 return -EFAULT;
1569
1570 str[count] = 0;
1571 opt = strtoul(str, NULL, 0);
1572 if (opt > 3)
1573 return -EFAULT;
1574
1575 /* just in case an OEM 'forgot' the motherboard... */
1576 options |= 1;
1577
1578 if (options & (1ul << opt)) {
1579 status = acpi_video_bus_set_POST(video, opt);
1580 if (!ACPI_SUCCESS(status))
1581 return -EFAULT;
1582
1583 }
1584
1585 return count;
1586 }
1587
1588 static ssize_t
1589 acpi_video_bus_write_DOS(struct file *file,
1590 const char __user * buffer,
1591 size_t count, loff_t * data)
1592 {
1593 int status;
1594 struct seq_file *m = file->private_data;
1595 struct acpi_video_bus *video = m->private;
1596 char str[12] = { 0 };
1597 unsigned long opt;
1598
1599
1600 if (!video || count + 1 > sizeof str)
1601 return -EINVAL;
1602
1603 if (copy_from_user(str, buffer, count))
1604 return -EFAULT;
1605
1606 str[count] = 0;
1607 opt = strtoul(str, NULL, 0);
1608 if (opt > 7)
1609 return -EFAULT;
1610
1611 status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1612
1613 if (!ACPI_SUCCESS(status))
1614 return -EFAULT;
1615
1616 return count;
1617 }
1618
1619 static int acpi_video_bus_add_fs(struct acpi_device *device)
1620 {
1621 struct acpi_video_bus *video = acpi_driver_data(device);
1622 struct proc_dir_entry *device_dir;
1623 struct proc_dir_entry *entry;
1624
1625 device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1626 if (!device_dir)
1627 return -ENOMEM;
1628
1629 /* 'info' [R] */
1630 entry = proc_create_data("info", S_IRUGO, device_dir,
1631 &acpi_video_bus_info_fops,
1632 acpi_driver_data(device));
1633 if (!entry)
1634 goto err_remove_dir;
1635
1636 /* 'ROM' [R] */
1637 entry = proc_create_data("ROM", S_IRUGO, device_dir,
1638 &acpi_video_bus_ROM_fops,
1639 acpi_driver_data(device));
1640 if (!entry)
1641 goto err_remove_info;
1642
1643 /* 'POST_info' [R] */
1644 entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1645 &acpi_video_bus_POST_info_fops,
1646 acpi_driver_data(device));
1647 if (!entry)
1648 goto err_remove_rom;
1649
1650 /* 'POST' [R/W] */
1651 entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1652 device_dir,
1653 &acpi_video_bus_POST_fops,
1654 acpi_driver_data(device));
1655 if (!entry)
1656 goto err_remove_post_info;
1657
1658 /* 'DOS' [R/W] */
1659 entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1660 device_dir,
1661 &acpi_video_bus_DOS_fops,
1662 acpi_driver_data(device));
1663 if (!entry)
1664 goto err_remove_post;
1665
1666 video->dir = acpi_device_dir(device) = device_dir;
1667 return 0;
1668
1669 err_remove_post:
1670 remove_proc_entry("POST", device_dir);
1671 err_remove_post_info:
1672 remove_proc_entry("POST_info", device_dir);
1673 err_remove_rom:
1674 remove_proc_entry("ROM", device_dir);
1675 err_remove_info:
1676 remove_proc_entry("info", device_dir);
1677 err_remove_dir:
1678 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1679 return -ENOMEM;
1680 }
1681
1682 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1683 {
1684 struct proc_dir_entry *device_dir = acpi_device_dir(device);
1685
1686 if (device_dir) {
1687 remove_proc_entry("info", device_dir);
1688 remove_proc_entry("ROM", device_dir);
1689 remove_proc_entry("POST_info", device_dir);
1690 remove_proc_entry("POST", device_dir);
1691 remove_proc_entry("DOS", device_dir);
1692 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1693 acpi_device_dir(device) = NULL;
1694 }
1695
1696 return 0;
1697 }
1698
1699 /* --------------------------------------------------------------------------
1700 Driver Interface
1701 -------------------------------------------------------------------------- */
1702
1703 /* device interface */
1704 static struct acpi_video_device_attrib*
1705 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1706 {
1707 struct acpi_video_enumerated_device *ids;
1708 int i;
1709
1710 for (i = 0; i < video->attached_count; i++) {
1711 ids = &video->attached_array[i];
1712 if ((ids->value.int_val & 0xffff) == device_id)
1713 return &ids->value.attrib;
1714 }
1715
1716 return NULL;
1717 }
1718
1719 static int
1720 acpi_video_bus_get_one_device(struct acpi_device *device,
1721 struct acpi_video_bus *video)
1722 {
1723 unsigned long long device_id;
1724 int status;
1725 struct acpi_video_device *data;
1726 struct acpi_video_device_attrib* attribute;
1727
1728 if (!device || !video)
1729 return -EINVAL;
1730
1731 status =
1732 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1733 if (ACPI_SUCCESS(status)) {
1734
1735 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1736 if (!data)
1737 return -ENOMEM;
1738
1739 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1740 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1741 device->driver_data = data;
1742
1743 data->device_id = device_id;
1744 data->video = video;
1745 data->dev = device;
1746
1747 attribute = acpi_video_get_device_attr(video, device_id);
1748
1749 if((attribute != NULL) && attribute->device_id_scheme) {
1750 switch (attribute->display_type) {
1751 case ACPI_VIDEO_DISPLAY_CRT:
1752 data->flags.crt = 1;
1753 break;
1754 case ACPI_VIDEO_DISPLAY_TV:
1755 data->flags.tvout = 1;
1756 break;
1757 case ACPI_VIDEO_DISPLAY_DVI:
1758 data->flags.dvi = 1;
1759 break;
1760 case ACPI_VIDEO_DISPLAY_LCD:
1761 data->flags.lcd = 1;
1762 break;
1763 default:
1764 data->flags.unknown = 1;
1765 break;
1766 }
1767 if(attribute->bios_can_detect)
1768 data->flags.bios = 1;
1769 } else
1770 data->flags.unknown = 1;
1771
1772 acpi_video_device_bind(video, data);
1773 acpi_video_device_find_cap(data);
1774
1775 status = acpi_install_notify_handler(device->handle,
1776 ACPI_DEVICE_NOTIFY,
1777 acpi_video_device_notify,
1778 data);
1779 if (ACPI_FAILURE(status)) {
1780 printk(KERN_ERR PREFIX
1781 "Error installing notify handler\n");
1782 if(data->brightness)
1783 kfree(data->brightness->levels);
1784 kfree(data->brightness);
1785 kfree(data);
1786 return -ENODEV;
1787 }
1788
1789 mutex_lock(&video->device_list_lock);
1790 list_add_tail(&data->entry, &video->video_device_list);
1791 mutex_unlock(&video->device_list_lock);
1792
1793 acpi_video_device_add_fs(device);
1794
1795 return 0;
1796 }
1797
1798 return -ENOENT;
1799 }
1800
1801 /*
1802 * Arg:
1803 * video : video bus device
1804 *
1805 * Return:
1806 * none
1807 *
1808 * Enumerate the video device list of the video bus,
1809 * bind the ids with the corresponding video devices
1810 * under the video bus.
1811 */
1812
1813 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1814 {
1815 struct acpi_video_device *dev;
1816
1817 mutex_lock(&video->device_list_lock);
1818
1819 list_for_each_entry(dev, &video->video_device_list, entry)
1820 acpi_video_device_bind(video, dev);
1821
1822 mutex_unlock(&video->device_list_lock);
1823 }
1824
1825 /*
1826 * Arg:
1827 * video : video bus device
1828 * device : video output device under the video
1829 * bus
1830 *
1831 * Return:
1832 * none
1833 *
1834 * Bind the ids with the corresponding video devices
1835 * under the video bus.
1836 */
1837
1838 static void
1839 acpi_video_device_bind(struct acpi_video_bus *video,
1840 struct acpi_video_device *device)
1841 {
1842 struct acpi_video_enumerated_device *ids;
1843 int i;
1844
1845 for (i = 0; i < video->attached_count; i++) {
1846 ids = &video->attached_array[i];
1847 if (device->device_id == (ids->value.int_val & 0xffff)) {
1848 ids->bind_info = device;
1849 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1850 }
1851 }
1852 }
1853
1854 /*
1855 * Arg:
1856 * video : video bus device
1857 *
1858 * Return:
1859 * < 0 : error
1860 *
1861 * Call _DOD to enumerate all devices attached to display adapter
1862 *
1863 */
1864
1865 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1866 {
1867 int status;
1868 int count;
1869 int i;
1870 struct acpi_video_enumerated_device *active_list;
1871 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1872 union acpi_object *dod = NULL;
1873 union acpi_object *obj;
1874
1875 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1876 if (!ACPI_SUCCESS(status)) {
1877 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1878 return status;
1879 }
1880
1881 dod = buffer.pointer;
1882 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1883 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1884 status = -EFAULT;
1885 goto out;
1886 }
1887
1888 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1889 dod->package.count));
1890
1891 active_list = kcalloc(1 + dod->package.count,
1892 sizeof(struct acpi_video_enumerated_device),
1893 GFP_KERNEL);
1894 if (!active_list) {
1895 status = -ENOMEM;
1896 goto out;
1897 }
1898
1899 count = 0;
1900 for (i = 0; i < dod->package.count; i++) {
1901 obj = &dod->package.elements[i];
1902
1903 if (obj->type != ACPI_TYPE_INTEGER) {
1904 printk(KERN_ERR PREFIX
1905 "Invalid _DOD data in element %d\n", i);
1906 continue;
1907 }
1908
1909 active_list[count].value.int_val = obj->integer.value;
1910 active_list[count].bind_info = NULL;
1911 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1912 (int)obj->integer.value));
1913 count++;
1914 }
1915
1916 kfree(video->attached_array);
1917
1918 video->attached_array = active_list;
1919 video->attached_count = count;
1920
1921 out:
1922 kfree(buffer.pointer);
1923 return status;
1924 }
1925
1926 static int
1927 acpi_video_get_next_level(struct acpi_video_device *device,
1928 u32 level_current, u32 event)
1929 {
1930 int min, max, min_above, max_below, i, l, delta = 255;
1931 max = max_below = 0;
1932 min = min_above = 255;
1933 /* Find closest level to level_current */
1934 for (i = 2; i < device->brightness->count; i++) {
1935 l = device->brightness->levels[i];
1936 if (abs(l - level_current) < abs(delta)) {
1937 delta = l - level_current;
1938 if (!delta)
1939 break;
1940 }
1941 }
1942 /* Ajust level_current to closest available level */
1943 level_current += delta;
1944 for (i = 2; i < device->brightness->count; i++) {
1945 l = device->brightness->levels[i];
1946 if (l < min)
1947 min = l;
1948 if (l > max)
1949 max = l;
1950 if (l < min_above && l > level_current)
1951 min_above = l;
1952 if (l > max_below && l < level_current)
1953 max_below = l;
1954 }
1955
1956 switch (event) {
1957 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1958 return (level_current < max) ? min_above : min;
1959 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1960 return (level_current < max) ? min_above : max;
1961 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1962 return (level_current > min) ? max_below : min;
1963 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1964 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1965 return 0;
1966 default:
1967 return level_current;
1968 }
1969 }
1970
1971 static int
1972 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1973 {
1974 unsigned long long level_current, level_next;
1975 int result = -EINVAL;
1976
1977 if (!device->brightness)
1978 goto out;
1979
1980 result = acpi_video_device_lcd_get_level_current(device,
1981 &level_current);
1982 if (result)
1983 goto out;
1984
1985 level_next = acpi_video_get_next_level(device, level_current, event);
1986
1987 result = acpi_video_device_lcd_set_level(device, level_next);
1988
1989 if (!result)
1990 backlight_force_update(device->backlight,
1991 BACKLIGHT_UPDATE_HOTKEY);
1992
1993 out:
1994 if (result)
1995 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1996
1997 return result;
1998 }
1999
2000 static int
2001 acpi_video_bus_get_devices(struct acpi_video_bus *video,
2002 struct acpi_device *device)
2003 {
2004 int status = 0;
2005 struct acpi_device *dev;
2006
2007 acpi_video_device_enumerate(video);
2008
2009 list_for_each_entry(dev, &device->children, node) {
2010
2011 status = acpi_video_bus_get_one_device(dev, video);
2012 if (ACPI_FAILURE(status)) {
2013 printk(KERN_WARNING PREFIX
2014 "Cant attach device");
2015 continue;
2016 }
2017 }
2018 return status;
2019 }
2020
2021 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
2022 {
2023 acpi_status status;
2024 struct acpi_video_bus *video;
2025
2026
2027 if (!device || !device->video)
2028 return -ENOENT;
2029
2030 video = device->video;
2031
2032 acpi_video_device_remove_fs(device->dev);
2033
2034 status = acpi_remove_notify_handler(device->dev->handle,
2035 ACPI_DEVICE_NOTIFY,
2036 acpi_video_device_notify);
2037 if (device->backlight) {
2038 sysfs_remove_link(&device->backlight->dev.kobj, "device");
2039 backlight_device_unregister(device->backlight);
2040 device->backlight = NULL;
2041 }
2042 if (device->cooling_dev) {
2043 sysfs_remove_link(&device->dev->dev.kobj,
2044 "thermal_cooling");
2045 sysfs_remove_link(&device->cooling_dev->device.kobj,
2046 "device");
2047 thermal_cooling_device_unregister(device->cooling_dev);
2048 device->cooling_dev = NULL;
2049 }
2050 video_output_unregister(device->output_dev);
2051
2052 return 0;
2053 }
2054
2055 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2056 {
2057 int status;
2058 struct acpi_video_device *dev, *next;
2059
2060 mutex_lock(&video->device_list_lock);
2061
2062 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2063
2064 status = acpi_video_bus_put_one_device(dev);
2065 if (ACPI_FAILURE(status))
2066 printk(KERN_WARNING PREFIX
2067 "hhuuhhuu bug in acpi video driver.\n");
2068
2069 if (dev->brightness) {
2070 kfree(dev->brightness->levels);
2071 kfree(dev->brightness);
2072 }
2073 list_del(&dev->entry);
2074 kfree(dev);
2075 }
2076
2077 mutex_unlock(&video->device_list_lock);
2078
2079 return 0;
2080 }
2081
2082 /* acpi_video interface */
2083
2084 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
2085 {
2086 return acpi_video_bus_DOS(video, 0, 0);
2087 }
2088
2089 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
2090 {
2091 return acpi_video_bus_DOS(video, 0, 1);
2092 }
2093
2094 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
2095 {
2096 struct acpi_video_bus *video = acpi_driver_data(device);
2097 struct input_dev *input;
2098 int keycode;
2099
2100 if (!video)
2101 return;
2102
2103 input = video->input;
2104
2105 switch (event) {
2106 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
2107 * most likely via hotkey. */
2108 acpi_bus_generate_proc_event(device, event, 0);
2109 keycode = KEY_SWITCHVIDEOMODE;
2110 break;
2111
2112 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
2113 * connector. */
2114 acpi_video_device_enumerate(video);
2115 acpi_video_device_rebind(video);
2116 acpi_bus_generate_proc_event(device, event, 0);
2117 keycode = KEY_SWITCHVIDEOMODE;
2118 break;
2119
2120 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
2121 acpi_bus_generate_proc_event(device, event, 0);
2122 keycode = KEY_SWITCHVIDEOMODE;
2123 break;
2124 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
2125 acpi_bus_generate_proc_event(device, event, 0);
2126 keycode = KEY_VIDEO_NEXT;
2127 break;
2128 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
2129 acpi_bus_generate_proc_event(device, event, 0);
2130 keycode = KEY_VIDEO_PREV;
2131 break;
2132
2133 default:
2134 keycode = KEY_UNKNOWN;
2135 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2136 "Unsupported event [0x%x]\n", event));
2137 break;
2138 }
2139
2140 acpi_notifier_call_chain(device, event, 0);
2141 input_report_key(input, keycode, 1);
2142 input_sync(input);
2143 input_report_key(input, keycode, 0);
2144 input_sync(input);
2145
2146 return;
2147 }
2148
2149 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
2150 {
2151 struct acpi_video_device *video_device = data;
2152 struct acpi_device *device = NULL;
2153 struct acpi_video_bus *bus;
2154 struct input_dev *input;
2155 int keycode;
2156
2157 if (!video_device)
2158 return;
2159
2160 device = video_device->dev;
2161 bus = video_device->video;
2162 input = bus->input;
2163
2164 switch (event) {
2165 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
2166 if (brightness_switch_enabled)
2167 acpi_video_switch_brightness(video_device, event);
2168 acpi_bus_generate_proc_event(device, event, 0);
2169 keycode = KEY_BRIGHTNESS_CYCLE;
2170 break;
2171 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
2172 if (brightness_switch_enabled)
2173 acpi_video_switch_brightness(video_device, event);
2174 acpi_bus_generate_proc_event(device, event, 0);
2175 keycode = KEY_BRIGHTNESSUP;
2176 break;
2177 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
2178 if (brightness_switch_enabled)
2179 acpi_video_switch_brightness(video_device, event);
2180 acpi_bus_generate_proc_event(device, event, 0);
2181 keycode = KEY_BRIGHTNESSDOWN;
2182 break;
2183 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
2184 if (brightness_switch_enabled)
2185 acpi_video_switch_brightness(video_device, event);
2186 acpi_bus_generate_proc_event(device, event, 0);
2187 keycode = KEY_BRIGHTNESS_ZERO;
2188 break;
2189 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
2190 if (brightness_switch_enabled)
2191 acpi_video_switch_brightness(video_device, event);
2192 acpi_bus_generate_proc_event(device, event, 0);
2193 keycode = KEY_DISPLAY_OFF;
2194 break;
2195 default:
2196 keycode = KEY_UNKNOWN;
2197 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2198 "Unsupported event [0x%x]\n", event));
2199 break;
2200 }
2201
2202 acpi_notifier_call_chain(device, event, 0);
2203 input_report_key(input, keycode, 1);
2204 input_sync(input);
2205 input_report_key(input, keycode, 0);
2206 input_sync(input);
2207
2208 return;
2209 }
2210
2211 static int instance;
2212 static int acpi_video_resume(struct acpi_device *device)
2213 {
2214 struct acpi_video_bus *video;
2215 struct acpi_video_device *video_device;
2216 int i;
2217
2218 if (!device || !acpi_driver_data(device))
2219 return -EINVAL;
2220
2221 video = acpi_driver_data(device);
2222
2223 for (i = 0; i < video->attached_count; i++) {
2224 video_device = video->attached_array[i].bind_info;
2225 if (video_device && video_device->backlight)
2226 acpi_video_set_brightness(video_device->backlight);
2227 }
2228 return AE_OK;
2229 }
2230
2231 static int acpi_video_bus_add(struct acpi_device *device)
2232 {
2233 struct acpi_video_bus *video;
2234 struct input_dev *input;
2235 int error;
2236
2237 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2238 if (!video)
2239 return -ENOMEM;
2240
2241 /* a hack to fix the duplicate name "VID" problem on T61 */
2242 if (!strcmp(device->pnp.bus_id, "VID")) {
2243 if (instance)
2244 device->pnp.bus_id[3] = '0' + instance;
2245 instance ++;
2246 }
2247 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2248 if (!strcmp(device->pnp.bus_id, "VGA")) {
2249 if (instance)
2250 device->pnp.bus_id[3] = '0' + instance;
2251 instance++;
2252 }
2253
2254 video->device = device;
2255 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2256 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2257 device->driver_data = video;
2258
2259 acpi_video_bus_find_cap(video);
2260 error = acpi_video_bus_check(video);
2261 if (error)
2262 goto err_free_video;
2263
2264 error = acpi_video_bus_add_fs(device);
2265 if (error)
2266 goto err_free_video;
2267
2268 mutex_init(&video->device_list_lock);
2269 INIT_LIST_HEAD(&video->video_device_list);
2270
2271 acpi_video_bus_get_devices(video, device);
2272 acpi_video_bus_start_devices(video);
2273
2274 video->input = input = input_allocate_device();
2275 if (!input) {
2276 error = -ENOMEM;
2277 goto err_stop_video;
2278 }
2279
2280 snprintf(video->phys, sizeof(video->phys),
2281 "%s/video/input0", acpi_device_hid(video->device));
2282
2283 input->name = acpi_device_name(video->device);
2284 input->phys = video->phys;
2285 input->id.bustype = BUS_HOST;
2286 input->id.product = 0x06;
2287 input->dev.parent = &device->dev;
2288 input->evbit[0] = BIT(EV_KEY);
2289 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2290 set_bit(KEY_VIDEO_NEXT, input->keybit);
2291 set_bit(KEY_VIDEO_PREV, input->keybit);
2292 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2293 set_bit(KEY_BRIGHTNESSUP, input->keybit);
2294 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2295 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2296 set_bit(KEY_DISPLAY_OFF, input->keybit);
2297 set_bit(KEY_UNKNOWN, input->keybit);
2298
2299 error = input_register_device(input);
2300 if (error)
2301 goto err_free_input_dev;
2302
2303 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
2304 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2305 video->flags.multihead ? "yes" : "no",
2306 video->flags.rom ? "yes" : "no",
2307 video->flags.post ? "yes" : "no");
2308
2309 return 0;
2310
2311 err_free_input_dev:
2312 input_free_device(input);
2313 err_stop_video:
2314 acpi_video_bus_stop_devices(video);
2315 acpi_video_bus_put_devices(video);
2316 kfree(video->attached_array);
2317 acpi_video_bus_remove_fs(device);
2318 err_free_video:
2319 kfree(video);
2320 device->driver_data = NULL;
2321
2322 return error;
2323 }
2324
2325 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2326 {
2327 struct acpi_video_bus *video = NULL;
2328
2329
2330 if (!device || !acpi_driver_data(device))
2331 return -EINVAL;
2332
2333 video = acpi_driver_data(device);
2334
2335 acpi_video_bus_stop_devices(video);
2336 acpi_video_bus_put_devices(video);
2337 acpi_video_bus_remove_fs(device);
2338
2339 input_unregister_device(video->input);
2340 kfree(video->attached_array);
2341 kfree(video);
2342
2343 return 0;
2344 }
2345
2346 static int __init intel_opregion_present(void)
2347 {
2348 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
2349 struct pci_dev *dev = NULL;
2350 u32 address;
2351
2352 for_each_pci_dev(dev) {
2353 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2354 continue;
2355 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2356 continue;
2357 pci_read_config_dword(dev, 0xfc, &address);
2358 if (!address)
2359 continue;
2360 return 1;
2361 }
2362 #endif
2363 return 0;
2364 }
2365
2366 int acpi_video_register(void)
2367 {
2368 int result = 0;
2369 if (register_count) {
2370 /*
2371 * if the function of acpi_video_register is already called,
2372 * don't register the acpi_vide_bus again and return no error.
2373 */
2374 return 0;
2375 }
2376
2377 acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2378 if (!acpi_video_dir)
2379 return -ENODEV;
2380
2381 result = acpi_bus_register_driver(&acpi_video_bus);
2382 if (result < 0) {
2383 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2384 return -ENODEV;
2385 }
2386
2387 /*
2388 * When the acpi_video_bus is loaded successfully, increase
2389 * the counter reference.
2390 */
2391 register_count = 1;
2392
2393 return 0;
2394 }
2395 EXPORT_SYMBOL(acpi_video_register);
2396
2397 void acpi_video_unregister(void)
2398 {
2399 if (!register_count) {
2400 /*
2401 * If the acpi video bus is already unloaded, don't
2402 * unload it again and return directly.
2403 */
2404 return;
2405 }
2406 acpi_bus_unregister_driver(&acpi_video_bus);
2407
2408 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2409
2410 register_count = 0;
2411
2412 return;
2413 }
2414 EXPORT_SYMBOL(acpi_video_unregister);
2415
2416 /*
2417 * This is kind of nasty. Hardware using Intel chipsets may require
2418 * the video opregion code to be run first in order to initialise
2419 * state before any ACPI video calls are made. To handle this we defer
2420 * registration of the video class until the opregion code has run.
2421 */
2422
2423 static int __init acpi_video_init(void)
2424 {
2425 dmi_check_system(video_dmi_table);
2426
2427 if (intel_opregion_present())
2428 return 0;
2429
2430 return acpi_video_register();
2431 }
2432
2433 static void __exit acpi_video_exit(void)
2434 {
2435 acpi_video_unregister();
2436
2437 return;
2438 }
2439
2440 module_init(acpi_video_init);
2441 module_exit(acpi_video_exit);
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