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cfq-iosched: fix locking around ioc->ioc_data assignment
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / acpi / video.c
blob9865d46f49a8faabfe0930640b2fe3bbd10b4b89
1 /*
2 * video.c - ACPI Video Driver ($Revision:$)
3 *
4 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
5 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
6 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
7 *
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23 *
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 */
26
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/types.h>
31 #include <linux/list.h>
32 #include <linux/mutex.h>
33 #include <linux/proc_fs.h>
34 #include <linux/seq_file.h>
35 #include <linux/input.h>
36 #include <linux/backlight.h>
37 #include <linux/thermal.h>
38 #include <linux/video_output.h>
39 #include <linux/sort.h>
40 #include <linux/pci.h>
41 #include <linux/pci_ids.h>
42 #include <linux/slab.h>
43 #include <asm/uaccess.h>
44 #include <linux/dmi.h>
45 #include <acpi/acpi_bus.h>
46 #include <acpi/acpi_drivers.h>
47 #include <linux/suspend.h>
48 #include <acpi/video.h>
49
50 #define PREFIX "ACPI: "
51
52 #define ACPI_VIDEO_CLASS "video"
53 #define ACPI_VIDEO_BUS_NAME "Video Bus"
54 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
55 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
56 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
57 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
58 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
59 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
60
61 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
62 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
63 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
64 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
65 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
66
67 #define MAX_NAME_LEN 20
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 /*
80 * By default, we don't allow duplicate ACPI video bus devices
81 * under the same VGA controller
82 */
83 static int allow_duplicates;
84 module_param(allow_duplicates, bool, 0644);
85
86 static int register_count = 0;
87 static int acpi_video_bus_add(struct acpi_device *device);
88 static int acpi_video_bus_remove(struct acpi_device *device, int type);
89 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
90
91 static const struct acpi_device_id video_device_ids[] = {
92 {ACPI_VIDEO_HID, 0},
93 {"", 0},
94 };
95 MODULE_DEVICE_TABLE(acpi, video_device_ids);
96
97 static struct acpi_driver acpi_video_bus = {
98 .name = "video",
99 .class = ACPI_VIDEO_CLASS,
100 .ids = video_device_ids,
101 .ops = {
102 .add = acpi_video_bus_add,
103 .remove = acpi_video_bus_remove,
104 .notify = acpi_video_bus_notify,
105 },
106 };
107
108 struct acpi_video_bus_flags {
109 u8 multihead:1; /* can switch video heads */
110 u8 rom:1; /* can retrieve a video rom */
111 u8 post:1; /* can configure the head to */
112 u8 reserved:5;
113 };
114
115 struct acpi_video_bus_cap {
116 u8 _DOS:1; /*Enable/Disable output switching */
117 u8 _DOD:1; /*Enumerate all devices attached to display adapter */
118 u8 _ROM:1; /*Get ROM Data */
119 u8 _GPD:1; /*Get POST Device */
120 u8 _SPD:1; /*Set POST Device */
121 u8 _VPO:1; /*Video POST Options */
122 u8 reserved:2;
123 };
124
125 struct acpi_video_device_attrib {
126 u32 display_index:4; /* A zero-based instance of the Display */
127 u32 display_port_attachment:4; /*This field differentiates the display type */
128 u32 display_type:4; /*Describe the specific type in use */
129 u32 vendor_specific:4; /*Chipset Vendor Specific */
130 u32 bios_can_detect:1; /*BIOS can detect the device */
131 u32 depend_on_vga:1; /*Non-VGA output device whose power is related to
132 the VGA device. */
133 u32 pipe_id:3; /*For VGA multiple-head devices. */
134 u32 reserved:10; /*Must be 0 */
135 u32 device_id_scheme:1; /*Device ID Scheme */
136 };
137
138 struct acpi_video_enumerated_device {
139 union {
140 u32 int_val;
141 struct acpi_video_device_attrib attrib;
142 } value;
143 struct acpi_video_device *bind_info;
144 };
145
146 struct acpi_video_bus {
147 struct acpi_device *device;
148 u8 dos_setting;
149 struct acpi_video_enumerated_device *attached_array;
150 u8 attached_count;
151 struct acpi_video_bus_cap cap;
152 struct acpi_video_bus_flags flags;
153 struct list_head video_device_list;
154 struct mutex device_list_lock; /* protects video_device_list */
155 struct proc_dir_entry *dir;
156 struct input_dev *input;
157 char phys[32]; /* for input device */
158 struct notifier_block pm_nb;
159 };
160
161 struct acpi_video_device_flags {
162 u8 crt:1;
163 u8 lcd:1;
164 u8 tvout:1;
165 u8 dvi:1;
166 u8 bios:1;
167 u8 unknown:1;
168 u8 reserved:2;
169 };
170
171 struct acpi_video_device_cap {
172 u8 _ADR:1; /*Return the unique ID */
173 u8 _BCL:1; /*Query list of brightness control levels supported */
174 u8 _BCM:1; /*Set the brightness level */
175 u8 _BQC:1; /* Get current brightness level */
176 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
177 u8 _DDC:1; /*Return the EDID for this device */
178 u8 _DCS:1; /*Return status of output device */
179 u8 _DGS:1; /*Query graphics state */
180 u8 _DSS:1; /*Device state set */
181 };
182
183 struct acpi_video_brightness_flags {
184 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
185 u8 _BCL_reversed:1; /* _BCL package is in a reversed order*/
186 u8 _BCL_use_index:1; /* levels in _BCL are index values */
187 u8 _BCM_use_index:1; /* input of _BCM is an index value */
188 u8 _BQC_use_index:1; /* _BQC returns an index value */
189 };
190
191 struct acpi_video_device_brightness {
192 int curr;
193 int count;
194 int *levels;
195 struct acpi_video_brightness_flags flags;
196 };
197
198 struct acpi_video_device {
199 unsigned long device_id;
200 struct acpi_video_device_flags flags;
201 struct acpi_video_device_cap cap;
202 struct list_head entry;
203 struct acpi_video_bus *video;
204 struct acpi_device *dev;
205 struct acpi_video_device_brightness *brightness;
206 struct backlight_device *backlight;
207 struct thermal_cooling_device *cooling_dev;
208 struct output_device *output_dev;
209 };
210
211 /* bus */
212 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
213 static const struct file_operations acpi_video_bus_info_fops = {
214 .owner = THIS_MODULE,
215 .open = acpi_video_bus_info_open_fs,
216 .read = seq_read,
217 .llseek = seq_lseek,
218 .release = single_release,
219 };
220
221 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
222 static const struct file_operations acpi_video_bus_ROM_fops = {
223 .owner = THIS_MODULE,
224 .open = acpi_video_bus_ROM_open_fs,
225 .read = seq_read,
226 .llseek = seq_lseek,
227 .release = single_release,
228 };
229
230 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
231 struct file *file);
232 static const struct file_operations acpi_video_bus_POST_info_fops = {
233 .owner = THIS_MODULE,
234 .open = acpi_video_bus_POST_info_open_fs,
235 .read = seq_read,
236 .llseek = seq_lseek,
237 .release = single_release,
238 };
239
240 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
241 static ssize_t acpi_video_bus_write_POST(struct file *file,
242 const char __user *buffer, size_t count, loff_t *data);
243 static const struct file_operations acpi_video_bus_POST_fops = {
244 .owner = THIS_MODULE,
245 .open = acpi_video_bus_POST_open_fs,
246 .read = seq_read,
247 .write = acpi_video_bus_write_POST,
248 .llseek = seq_lseek,
249 .release = single_release,
250 };
251
252 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
253 static ssize_t acpi_video_bus_write_DOS(struct file *file,
254 const char __user *buffer, size_t count, loff_t *data);
255 static const struct file_operations acpi_video_bus_DOS_fops = {
256 .owner = THIS_MODULE,
257 .open = acpi_video_bus_DOS_open_fs,
258 .read = seq_read,
259 .write = acpi_video_bus_write_DOS,
260 .llseek = seq_lseek,
261 .release = single_release,
262 };
263
264 /* device */
265 static int acpi_video_device_info_open_fs(struct inode *inode,
266 struct file *file);
267 static const struct file_operations acpi_video_device_info_fops = {
268 .owner = THIS_MODULE,
269 .open = acpi_video_device_info_open_fs,
270 .read = seq_read,
271 .llseek = seq_lseek,
272 .release = single_release,
273 };
274
275 static int acpi_video_device_state_open_fs(struct inode *inode,
276 struct file *file);
277 static ssize_t acpi_video_device_write_state(struct file *file,
278 const char __user *buffer, size_t count, loff_t *data);
279 static const struct file_operations acpi_video_device_state_fops = {
280 .owner = THIS_MODULE,
281 .open = acpi_video_device_state_open_fs,
282 .read = seq_read,
283 .write = acpi_video_device_write_state,
284 .llseek = seq_lseek,
285 .release = single_release,
286 };
287
288 static int acpi_video_device_brightness_open_fs(struct inode *inode,
289 struct file *file);
290 static ssize_t acpi_video_device_write_brightness(struct file *file,
291 const char __user *buffer, size_t count, loff_t *data);
292 static const struct file_operations acpi_video_device_brightness_fops = {
293 .owner = THIS_MODULE,
294 .open = acpi_video_device_brightness_open_fs,
295 .read = seq_read,
296 .write = acpi_video_device_write_brightness,
297 .llseek = seq_lseek,
298 .release = single_release,
299 };
300
301 static int acpi_video_device_EDID_open_fs(struct inode *inode,
302 struct file *file);
303 static const struct file_operations acpi_video_device_EDID_fops = {
304 .owner = THIS_MODULE,
305 .open = acpi_video_device_EDID_open_fs,
306 .read = seq_read,
307 .llseek = seq_lseek,
308 .release = single_release,
309 };
310
311 static const char device_decode[][30] = {
312 "motherboard VGA device",
313 "PCI VGA device",
314 "AGP VGA device",
315 "UNKNOWN",
316 };
317
318 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
319 static void acpi_video_device_rebind(struct acpi_video_bus *video);
320 static void acpi_video_device_bind(struct acpi_video_bus *video,
321 struct acpi_video_device *device);
322 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
323 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
324 int level);
325 static int acpi_video_device_lcd_get_level_current(
326 struct acpi_video_device *device,
327 unsigned long long *level, int init);
328 static int acpi_video_get_next_level(struct acpi_video_device *device,
329 u32 level_current, u32 event);
330 static int acpi_video_switch_brightness(struct acpi_video_device *device,
331 int event);
332 static int acpi_video_device_get_state(struct acpi_video_device *device,
333 unsigned long long *state);
334 static int acpi_video_output_get(struct output_device *od);
335 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
336
337 /*backlight device sysfs support*/
338 static int acpi_video_get_brightness(struct backlight_device *bd)
339 {
340 unsigned long long cur_level;
341 int i;
342 struct acpi_video_device *vd =
343 (struct acpi_video_device *)bl_get_data(bd);
344
345 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, 0))
346 return -EINVAL;
347 for (i = 2; i < vd->brightness->count; i++) {
348 if (vd->brightness->levels[i] == cur_level)
349 /* The first two entries are special - see page 575
350 of the ACPI spec 3.0 */
351 return i-2;
352 }
353 return 0;
354 }
355
356 static int acpi_video_set_brightness(struct backlight_device *bd)
357 {
358 int request_level = bd->props.brightness + 2;
359 struct acpi_video_device *vd =
360 (struct acpi_video_device *)bl_get_data(bd);
361
362 return acpi_video_device_lcd_set_level(vd,
363 vd->brightness->levels[request_level]);
364 }
365
366 static struct backlight_ops acpi_backlight_ops = {
367 .get_brightness = acpi_video_get_brightness,
368 .update_status = acpi_video_set_brightness,
369 };
370
371 /*video output device sysfs support*/
372 static int acpi_video_output_get(struct output_device *od)
373 {
374 unsigned long long state;
375 struct acpi_video_device *vd =
376 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
377 acpi_video_device_get_state(vd, &state);
378 return (int)state;
379 }
380
381 static int acpi_video_output_set(struct output_device *od)
382 {
383 unsigned long state = od->request_state;
384 struct acpi_video_device *vd=
385 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
386 return acpi_video_device_set_state(vd, state);
387 }
388
389 static struct output_properties acpi_output_properties = {
390 .set_state = acpi_video_output_set,
391 .get_status = acpi_video_output_get,
392 };
393
394
395 /* thermal cooling device callbacks */
396 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
397 long *state)
398 {
399 struct acpi_device *device = cooling_dev->devdata;
400 struct acpi_video_device *video = acpi_driver_data(device);
401
402 *state = video->brightness->count - 3;
403 return 0;
404 }
405
406 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
407 long *state)
408 {
409 struct acpi_device *device = cooling_dev->devdata;
410 struct acpi_video_device *video = acpi_driver_data(device);
411 unsigned long long level;
412 int offset;
413
414 if (acpi_video_device_lcd_get_level_current(video, &level, 0))
415 return -EINVAL;
416 for (offset = 2; offset < video->brightness->count; offset++)
417 if (level == video->brightness->levels[offset]) {
418 *state = video->brightness->count - offset - 1;
419 return 0;
420 }
421
422 return -EINVAL;
423 }
424
425 static int
426 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
427 {
428 struct acpi_device *device = cooling_dev->devdata;
429 struct acpi_video_device *video = acpi_driver_data(device);
430 int level;
431
432 if ( state >= video->brightness->count - 2)
433 return -EINVAL;
434
435 state = video->brightness->count - state;
436 level = video->brightness->levels[state -1];
437 return acpi_video_device_lcd_set_level(video, level);
438 }
439
440 static struct thermal_cooling_device_ops video_cooling_ops = {
441 .get_max_state = video_get_max_state,
442 .get_cur_state = video_get_cur_state,
443 .set_cur_state = video_set_cur_state,
444 };
445
446 /* --------------------------------------------------------------------------
447 Video Management
448 -------------------------------------------------------------------------- */
449
450 /* device */
451
452 static int
453 acpi_video_device_query(struct acpi_video_device *device, unsigned long long *state)
454 {
455 int status;
456
457 status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
458
459 return status;
460 }
461
462 static int
463 acpi_video_device_get_state(struct acpi_video_device *device,
464 unsigned long long *state)
465 {
466 int status;
467
468 status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
469
470 return status;
471 }
472
473 static int
474 acpi_video_device_set_state(struct acpi_video_device *device, int state)
475 {
476 int status;
477 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
478 struct acpi_object_list args = { 1, &arg0 };
479 unsigned long long ret;
480
481
482 arg0.integer.value = state;
483 status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
484
485 return status;
486 }
487
488 static int
489 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
490 union acpi_object **levels)
491 {
492 int status;
493 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
494 union acpi_object *obj;
495
496
497 *levels = NULL;
498
499 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
500 if (!ACPI_SUCCESS(status))
501 return status;
502 obj = (union acpi_object *)buffer.pointer;
503 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
504 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
505 status = -EFAULT;
506 goto err;
507 }
508
509 *levels = obj;
510
511 return 0;
512
513 err:
514 kfree(buffer.pointer);
515
516 return status;
517 }
518
519 static int
520 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
521 {
522 int status;
523 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
524 struct acpi_object_list args = { 1, &arg0 };
525 int state;
526
527 arg0.integer.value = level;
528
529 status = acpi_evaluate_object(device->dev->handle, "_BCM",
530 &args, NULL);
531 if (ACPI_FAILURE(status)) {
532 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
533 return -EIO;
534 }
535
536 device->brightness->curr = level;
537 for (state = 2; state < device->brightness->count; state++)
538 if (level == device->brightness->levels[state]) {
539 if (device->backlight)
540 device->backlight->props.brightness = state - 2;
541 return 0;
542 }
543
544 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
545 return -EINVAL;
546 }
547
548 /*
549 * For some buggy _BQC methods, we need to add a constant value to
550 * the _BQC return value to get the actual current brightness level
551 */
552
553 static int bqc_offset_aml_bug_workaround;
554 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
555 {
556 bqc_offset_aml_bug_workaround = 9;
557 return 0;
558 }
559
560 static struct dmi_system_id video_dmi_table[] __initdata = {
561 /*
562 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
563 */
564 {
565 .callback = video_set_bqc_offset,
566 .ident = "Acer Aspire 5720",
567 .matches = {
568 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
569 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
570 },
571 },
572 {
573 .callback = video_set_bqc_offset,
574 .ident = "Acer Aspire 5710Z",
575 .matches = {
576 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
577 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
578 },
579 },
580 {
581 .callback = video_set_bqc_offset,
582 .ident = "eMachines E510",
583 .matches = {
584 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
585 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
586 },
587 },
588 {
589 .callback = video_set_bqc_offset,
590 .ident = "Acer Aspire 5315",
591 .matches = {
592 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
593 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
594 },
595 },
596 {
597 .callback = video_set_bqc_offset,
598 .ident = "Acer Aspire 7720",
599 .matches = {
600 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
601 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
602 },
603 },
604 {}
605 };
606
607 static int
608 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
609 unsigned long long *level, int init)
610 {
611 acpi_status status = AE_OK;
612 int i;
613
614 if (device->cap._BQC || device->cap._BCQ) {
615 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
616
617 status = acpi_evaluate_integer(device->dev->handle, buf,
618 NULL, level);
619 if (ACPI_SUCCESS(status)) {
620 if (device->brightness->flags._BQC_use_index) {
621 if (device->brightness->flags._BCL_reversed)
622 *level = device->brightness->count
623 - 3 - (*level);
624 *level = device->brightness->levels[*level + 2];
625
626 }
627 *level += bqc_offset_aml_bug_workaround;
628 for (i = 2; i < device->brightness->count; i++)
629 if (device->brightness->levels[i] == *level) {
630 device->brightness->curr = *level;
631 return 0;
632 }
633 if (!init) {
634 /*
635 * BQC returned an invalid level.
636 * Stop using it.
637 */
638 ACPI_WARNING((AE_INFO,
639 "%s returned an invalid level",
640 buf));
641 device->cap._BQC = device->cap._BCQ = 0;
642 }
643 } else {
644 /* Fixme:
645 * should we return an error or ignore this failure?
646 * dev->brightness->curr is a cached value which stores
647 * the correct current backlight level in most cases.
648 * ACPI video backlight still works w/ buggy _BQC.
649 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
650 */
651 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
652 device->cap._BQC = device->cap._BCQ = 0;
653 }
654 }
655
656 *level = device->brightness->curr;
657 return 0;
658 }
659
660 static int
661 acpi_video_device_EDID(struct acpi_video_device *device,
662 union acpi_object **edid, ssize_t length)
663 {
664 int status;
665 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
666 union acpi_object *obj;
667 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
668 struct acpi_object_list args = { 1, &arg0 };
669
670
671 *edid = NULL;
672
673 if (!device)
674 return -ENODEV;
675 if (length == 128)
676 arg0.integer.value = 1;
677 else if (length == 256)
678 arg0.integer.value = 2;
679 else
680 return -EINVAL;
681
682 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
683 if (ACPI_FAILURE(status))
684 return -ENODEV;
685
686 obj = buffer.pointer;
687
688 if (obj && obj->type == ACPI_TYPE_BUFFER)
689 *edid = obj;
690 else {
691 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
692 status = -EFAULT;
693 kfree(obj);
694 }
695
696 return status;
697 }
698
699 /* bus */
700
701 static int
702 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
703 {
704 int status;
705 unsigned long long tmp;
706 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
707 struct acpi_object_list args = { 1, &arg0 };
708
709
710 arg0.integer.value = option;
711
712 status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
713 if (ACPI_SUCCESS(status))
714 status = tmp ? (-EINVAL) : (AE_OK);
715
716 return status;
717 }
718
719 static int
720 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long long *id)
721 {
722 int status;
723
724 status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
725
726 return status;
727 }
728
729 static int
730 acpi_video_bus_POST_options(struct acpi_video_bus *video,
731 unsigned long long *options)
732 {
733 int status;
734
735 status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
736 *options &= 3;
737
738 return status;
739 }
740
741 /*
742 * Arg:
743 * video : video bus device pointer
744 * bios_flag :
745 * 0. The system BIOS should NOT automatically switch(toggle)
746 * the active display output.
747 * 1. The system BIOS should automatically switch (toggle) the
748 * active display output. No switch event.
749 * 2. The _DGS value should be locked.
750 * 3. The system BIOS should not automatically switch (toggle) the
751 * active display output, but instead generate the display switch
752 * event notify code.
753 * lcd_flag :
754 * 0. The system BIOS should automatically control the brightness level
755 * of the LCD when the power changes from AC to DC
756 * 1. The system BIOS should NOT automatically control the brightness
757 * level of the LCD when the power changes from AC to DC.
758 * Return Value:
759 * -1 wrong arg.
760 */
761
762 static int
763 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
764 {
765 u64 status = 0;
766 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
767 struct acpi_object_list args = { 1, &arg0 };
768
769
770 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
771 status = -1;
772 goto Failed;
773 }
774 arg0.integer.value = (lcd_flag << 2) | bios_flag;
775 video->dos_setting = arg0.integer.value;
776 acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
777
778 Failed:
779 return status;
780 }
781
782 /*
783 * Simple comparison function used to sort backlight levels.
784 */
785
786 static int
787 acpi_video_cmp_level(const void *a, const void *b)
788 {
789 return *(int *)a - *(int *)b;
790 }
791
792 /*
793 * Arg:
794 * device : video output device (LCD, CRT, ..)
795 *
796 * Return Value:
797 * Maximum brightness level
798 *
799 * Allocate and initialize device->brightness.
800 */
801
802 static int
803 acpi_video_init_brightness(struct acpi_video_device *device)
804 {
805 union acpi_object *obj = NULL;
806 int i, max_level = 0, count = 0, level_ac_battery = 0;
807 unsigned long long level, level_old;
808 union acpi_object *o;
809 struct acpi_video_device_brightness *br = NULL;
810 int result = -EINVAL;
811
812 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
813 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
814 "LCD brightness level\n"));
815 goto out;
816 }
817
818 if (obj->package.count < 2)
819 goto out;
820
821 br = kzalloc(sizeof(*br), GFP_KERNEL);
822 if (!br) {
823 printk(KERN_ERR "can't allocate memory\n");
824 result = -ENOMEM;
825 goto out;
826 }
827
828 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
829 GFP_KERNEL);
830 if (!br->levels) {
831 result = -ENOMEM;
832 goto out_free;
833 }
834
835 for (i = 0; i < obj->package.count; i++) {
836 o = (union acpi_object *)&obj->package.elements[i];
837 if (o->type != ACPI_TYPE_INTEGER) {
838 printk(KERN_ERR PREFIX "Invalid data\n");
839 continue;
840 }
841 br->levels[count] = (u32) o->integer.value;
842
843 if (br->levels[count] > max_level)
844 max_level = br->levels[count];
845 count++;
846 }
847
848 /*
849 * some buggy BIOS don't export the levels
850 * when machine is on AC/Battery in _BCL package.
851 * In this case, the first two elements in _BCL packages
852 * are also supported brightness levels that OS should take care of.
853 */
854 for (i = 2; i < count; i++) {
855 if (br->levels[i] == br->levels[0])
856 level_ac_battery++;
857 if (br->levels[i] == br->levels[1])
858 level_ac_battery++;
859 }
860
861 if (level_ac_battery < 2) {
862 level_ac_battery = 2 - level_ac_battery;
863 br->flags._BCL_no_ac_battery_levels = 1;
864 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
865 br->levels[i] = br->levels[i - level_ac_battery];
866 count += level_ac_battery;
867 } else if (level_ac_battery > 2)
868 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
869
870 /* Check if the _BCL package is in a reversed order */
871 if (max_level == br->levels[2]) {
872 br->flags._BCL_reversed = 1;
873 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
874 acpi_video_cmp_level, NULL);
875 } else if (max_level != br->levels[count - 1])
876 ACPI_ERROR((AE_INFO,
877 "Found unordered _BCL package\n"));
878
879 br->count = count;
880 device->brightness = br;
881
882 /* Check the input/output of _BQC/_BCL/_BCM */
883 if ((max_level < 100) && (max_level <= (count - 2)))
884 br->flags._BCL_use_index = 1;
885
886 /*
887 * _BCM is always consistent with _BCL,
888 * at least for all the laptops we have ever seen.
889 */
890 br->flags._BCM_use_index = br->flags._BCL_use_index;
891
892 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
893 br->curr = level = max_level;
894
895 if (!device->cap._BQC)
896 goto set_level;
897
898 result = acpi_video_device_lcd_get_level_current(device, &level_old, 1);
899 if (result)
900 goto out_free_levels;
901
902 /*
903 * Set the level to maximum and check if _BQC uses indexed value
904 */
905 result = acpi_video_device_lcd_set_level(device, max_level);
906 if (result)
907 goto out_free_levels;
908
909 result = acpi_video_device_lcd_get_level_current(device, &level, 0);
910 if (result)
911 goto out_free_levels;
912
913 br->flags._BQC_use_index = (level == max_level ? 0 : 1);
914
915 if (!br->flags._BQC_use_index) {
916 /*
917 * Set the backlight to the initial state.
918 * On some buggy laptops, _BQC returns an uninitialized value
919 * when invoked for the first time, i.e. level_old is invalid.
920 * set the backlight to max_level in this case
921 */
922 for (i = 2; i < br->count; i++)
923 if (level_old == br->levels[i])
924 level = level_old;
925 goto set_level;
926 }
927
928 if (br->flags._BCL_reversed)
929 level_old = (br->count - 1) - level_old;
930 level = br->levels[level_old];
931
932 set_level:
933 result = acpi_video_device_lcd_set_level(device, level);
934 if (result)
935 goto out_free_levels;
936
937 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
938 "found %d brightness levels\n", count - 2));
939 kfree(obj);
940 return result;
941
942 out_free_levels:
943 kfree(br->levels);
944 out_free:
945 kfree(br);
946 out:
947 device->brightness = NULL;
948 kfree(obj);
949 return result;
950 }
951
952 /*
953 * Arg:
954 * device : video output device (LCD, CRT, ..)
955 *
956 * Return Value:
957 * None
958 *
959 * Find out all required AML methods defined under the output
960 * device.
961 */
962
963 static void acpi_video_device_find_cap(struct acpi_video_device *device)
964 {
965 acpi_handle h_dummy1;
966
967 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
968 device->cap._ADR = 1;
969 }
970 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
971 device->cap._BCL = 1;
972 }
973 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
974 device->cap._BCM = 1;
975 }
976 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
977 device->cap._BQC = 1;
978 else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
979 &h_dummy1))) {
980 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
981 device->cap._BCQ = 1;
982 }
983
984 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
985 device->cap._DDC = 1;
986 }
987 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
988 device->cap._DCS = 1;
989 }
990 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
991 device->cap._DGS = 1;
992 }
993 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
994 device->cap._DSS = 1;
995 }
996
997 if (acpi_video_backlight_support()) {
998 struct backlight_properties props;
999 int result;
1000 static int count = 0;
1001 char *name;
1002
1003 result = acpi_video_init_brightness(device);
1004 if (result)
1005 return;
1006 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1007 if (!name)
1008 return;
1009 count++;
1010
1011 memset(&props, 0, sizeof(struct backlight_properties));
1012 props.max_brightness = device->brightness->count - 3;
1013 device->backlight = backlight_device_register(name, NULL, device,
1014 &acpi_backlight_ops,
1015 &props);
1016 kfree(name);
1017 if (IS_ERR(device->backlight))
1018 return;
1019
1020 /*
1021 * Save current brightness level in case we have to restore it
1022 * before acpi_video_device_lcd_set_level() is called next time.
1023 */
1024 device->backlight->props.brightness =
1025 acpi_video_get_brightness(device->backlight);
1026
1027 result = sysfs_create_link(&device->backlight->dev.kobj,
1028 &device->dev->dev.kobj, "device");
1029 if (result)
1030 printk(KERN_ERR PREFIX "Create sysfs link\n");
1031
1032 device->cooling_dev = thermal_cooling_device_register("LCD",
1033 device->dev, &video_cooling_ops);
1034 if (IS_ERR(device->cooling_dev)) {
1035 /*
1036 * Set cooling_dev to NULL so we don't crash trying to
1037 * free it.
1038 * Also, why the hell we are returning early and
1039 * not attempt to register video output if cooling
1040 * device registration failed?
1041 * -- dtor
1042 */
1043 device->cooling_dev = NULL;
1044 return;
1045 }
1046
1047 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1048 device->cooling_dev->id);
1049 result = sysfs_create_link(&device->dev->dev.kobj,
1050 &device->cooling_dev->device.kobj,
1051 "thermal_cooling");
1052 if (result)
1053 printk(KERN_ERR PREFIX "Create sysfs link\n");
1054 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1055 &device->dev->dev.kobj, "device");
1056 if (result)
1057 printk(KERN_ERR PREFIX "Create sysfs link\n");
1058
1059 }
1060
1061 if (acpi_video_display_switch_support()) {
1062
1063 if (device->cap._DCS && device->cap._DSS) {
1064 static int count;
1065 char *name;
1066 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1067 if (!name)
1068 return;
1069 count++;
1070 device->output_dev = video_output_register(name,
1071 NULL, device, &acpi_output_properties);
1072 kfree(name);
1073 }
1074 }
1075 }
1076
1077 /*
1078 * Arg:
1079 * device : video output device (VGA)
1080 *
1081 * Return Value:
1082 * None
1083 *
1084 * Find out all required AML methods defined under the video bus device.
1085 */
1086
1087 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1088 {
1089 acpi_handle h_dummy1;
1090
1091 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
1092 video->cap._DOS = 1;
1093 }
1094 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
1095 video->cap._DOD = 1;
1096 }
1097 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
1098 video->cap._ROM = 1;
1099 }
1100 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
1101 video->cap._GPD = 1;
1102 }
1103 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
1104 video->cap._SPD = 1;
1105 }
1106 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
1107 video->cap._VPO = 1;
1108 }
1109 }
1110
1111 /*
1112 * Check whether the video bus device has required AML method to
1113 * support the desired features
1114 */
1115
1116 static int acpi_video_bus_check(struct acpi_video_bus *video)
1117 {
1118 acpi_status status = -ENOENT;
1119 struct pci_dev *dev;
1120
1121 if (!video)
1122 return -EINVAL;
1123
1124 dev = acpi_get_pci_dev(video->device->handle);
1125 if (!dev)
1126 return -ENODEV;
1127 pci_dev_put(dev);
1128
1129 /* Since there is no HID, CID and so on for VGA driver, we have
1130 * to check well known required nodes.
1131 */
1132
1133 /* Does this device support video switching? */
1134 if (video->cap._DOS || video->cap._DOD) {
1135 if (!video->cap._DOS) {
1136 printk(KERN_WARNING FW_BUG
1137 "ACPI(%s) defines _DOD but not _DOS\n",
1138 acpi_device_bid(video->device));
1139 }
1140 video->flags.multihead = 1;
1141 status = 0;
1142 }
1143
1144 /* Does this device support retrieving a video ROM? */
1145 if (video->cap._ROM) {
1146 video->flags.rom = 1;
1147 status = 0;
1148 }
1149
1150 /* Does this device support configuring which video device to POST? */
1151 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1152 video->flags.post = 1;
1153 status = 0;
1154 }
1155
1156 return status;
1157 }
1158
1159 /* --------------------------------------------------------------------------
1160 FS Interface (/proc)
1161 -------------------------------------------------------------------------- */
1162
1163 static struct proc_dir_entry *acpi_video_dir;
1164
1165 /* video devices */
1166
1167 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
1168 {
1169 struct acpi_video_device *dev = seq->private;
1170
1171
1172 if (!dev)
1173 goto end;
1174
1175 seq_printf(seq, "device_id: 0x%04x\n", (u32) dev->device_id);
1176 seq_printf(seq, "type: ");
1177 if (dev->flags.crt)
1178 seq_printf(seq, "CRT\n");
1179 else if (dev->flags.lcd)
1180 seq_printf(seq, "LCD\n");
1181 else if (dev->flags.tvout)
1182 seq_printf(seq, "TVOUT\n");
1183 else if (dev->flags.dvi)
1184 seq_printf(seq, "DVI\n");
1185 else
1186 seq_printf(seq, "UNKNOWN\n");
1187
1188 seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
1189
1190 end:
1191 return 0;
1192 }
1193
1194 static int
1195 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
1196 {
1197 return single_open(file, acpi_video_device_info_seq_show,
1198 PDE(inode)->data);
1199 }
1200
1201 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
1202 {
1203 int status;
1204 struct acpi_video_device *dev = seq->private;
1205 unsigned long long state;
1206
1207
1208 if (!dev)
1209 goto end;
1210
1211 status = acpi_video_device_get_state(dev, &state);
1212 seq_printf(seq, "state: ");
1213 if (ACPI_SUCCESS(status))
1214 seq_printf(seq, "0x%02llx\n", state);
1215 else
1216 seq_printf(seq, "<not supported>\n");
1217
1218 status = acpi_video_device_query(dev, &state);
1219 seq_printf(seq, "query: ");
1220 if (ACPI_SUCCESS(status))
1221 seq_printf(seq, "0x%02llx\n", state);
1222 else
1223 seq_printf(seq, "<not supported>\n");
1224
1225 end:
1226 return 0;
1227 }
1228
1229 static int
1230 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
1231 {
1232 return single_open(file, acpi_video_device_state_seq_show,
1233 PDE(inode)->data);
1234 }
1235
1236 static ssize_t
1237 acpi_video_device_write_state(struct file *file,
1238 const char __user * buffer,
1239 size_t count, loff_t * data)
1240 {
1241 int status;
1242 struct seq_file *m = file->private_data;
1243 struct acpi_video_device *dev = m->private;
1244 char str[12] = { 0 };
1245 u32 state = 0;
1246
1247
1248 if (!dev || count >= sizeof(str))
1249 return -EINVAL;
1250
1251 if (copy_from_user(str, buffer, count))
1252 return -EFAULT;
1253
1254 str[count] = 0;
1255 state = simple_strtoul(str, NULL, 0);
1256 state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
1257
1258 status = acpi_video_device_set_state(dev, state);
1259
1260 if (status)
1261 return -EFAULT;
1262
1263 return count;
1264 }
1265
1266 static int
1267 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
1268 {
1269 struct acpi_video_device *dev = seq->private;
1270 int i;
1271
1272
1273 if (!dev || !dev->brightness) {
1274 seq_printf(seq, "<not supported>\n");
1275 return 0;
1276 }
1277
1278 seq_printf(seq, "levels: ");
1279 for (i = 2; i < dev->brightness->count; i++)
1280 seq_printf(seq, " %d", dev->brightness->levels[i]);
1281 seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
1282
1283 return 0;
1284 }
1285
1286 static int
1287 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1288 {
1289 return single_open(file, acpi_video_device_brightness_seq_show,
1290 PDE(inode)->data);
1291 }
1292
1293 static ssize_t
1294 acpi_video_device_write_brightness(struct file *file,
1295 const char __user * buffer,
1296 size_t count, loff_t * data)
1297 {
1298 struct seq_file *m = file->private_data;
1299 struct acpi_video_device *dev = m->private;
1300 char str[5] = { 0 };
1301 unsigned int level = 0;
1302 int i;
1303
1304
1305 if (!dev || !dev->brightness || count >= sizeof(str))
1306 return -EINVAL;
1307
1308 if (copy_from_user(str, buffer, count))
1309 return -EFAULT;
1310
1311 str[count] = 0;
1312 level = simple_strtoul(str, NULL, 0);
1313
1314 if (level > 100)
1315 return -EFAULT;
1316
1317 /* validate through the list of available levels */
1318 for (i = 2; i < dev->brightness->count; i++)
1319 if (level == dev->brightness->levels[i]) {
1320 if (!acpi_video_device_lcd_set_level(dev, level))
1321 return count;
1322 break;
1323 }
1324
1325 return -EINVAL;
1326 }
1327
1328 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1329 {
1330 struct acpi_video_device *dev = seq->private;
1331 int status;
1332 int i;
1333 union acpi_object *edid = NULL;
1334
1335
1336 if (!dev)
1337 goto out;
1338
1339 status = acpi_video_device_EDID(dev, &edid, 128);
1340 if (ACPI_FAILURE(status)) {
1341 status = acpi_video_device_EDID(dev, &edid, 256);
1342 }
1343
1344 if (ACPI_FAILURE(status)) {
1345 goto out;
1346 }
1347
1348 if (edid && edid->type == ACPI_TYPE_BUFFER) {
1349 for (i = 0; i < edid->buffer.length; i++)
1350 seq_putc(seq, edid->buffer.pointer[i]);
1351 }
1352
1353 out:
1354 if (!edid)
1355 seq_printf(seq, "<not supported>\n");
1356 else
1357 kfree(edid);
1358
1359 return 0;
1360 }
1361
1362 static int
1363 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1364 {
1365 return single_open(file, acpi_video_device_EDID_seq_show,
1366 PDE(inode)->data);
1367 }
1368
1369 static int acpi_video_device_add_fs(struct acpi_device *device)
1370 {
1371 struct proc_dir_entry *entry, *device_dir;
1372 struct acpi_video_device *vid_dev;
1373
1374 vid_dev = acpi_driver_data(device);
1375 if (!vid_dev)
1376 return -ENODEV;
1377
1378 device_dir = proc_mkdir(acpi_device_bid(device),
1379 vid_dev->video->dir);
1380 if (!device_dir)
1381 return -ENOMEM;
1382
1383 /* 'info' [R] */
1384 entry = proc_create_data("info", S_IRUGO, device_dir,
1385 &acpi_video_device_info_fops, acpi_driver_data(device));
1386 if (!entry)
1387 goto err_remove_dir;
1388
1389 /* 'state' [R/W] */
1390 entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1391 device_dir,
1392 &acpi_video_device_state_fops,
1393 acpi_driver_data(device));
1394 if (!entry)
1395 goto err_remove_info;
1396
1397 /* 'brightness' [R/W] */
1398 entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1399 device_dir,
1400 &acpi_video_device_brightness_fops,
1401 acpi_driver_data(device));
1402 if (!entry)
1403 goto err_remove_state;
1404
1405 /* 'EDID' [R] */
1406 entry = proc_create_data("EDID", S_IRUGO, device_dir,
1407 &acpi_video_device_EDID_fops,
1408 acpi_driver_data(device));
1409 if (!entry)
1410 goto err_remove_brightness;
1411
1412 acpi_device_dir(device) = device_dir;
1413
1414 return 0;
1415
1416 err_remove_brightness:
1417 remove_proc_entry("brightness", device_dir);
1418 err_remove_state:
1419 remove_proc_entry("state", device_dir);
1420 err_remove_info:
1421 remove_proc_entry("info", device_dir);
1422 err_remove_dir:
1423 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1424 return -ENOMEM;
1425 }
1426
1427 static int acpi_video_device_remove_fs(struct acpi_device *device)
1428 {
1429 struct acpi_video_device *vid_dev;
1430 struct proc_dir_entry *device_dir;
1431
1432 vid_dev = acpi_driver_data(device);
1433 if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1434 return -ENODEV;
1435
1436 device_dir = acpi_device_dir(device);
1437 if (device_dir) {
1438 remove_proc_entry("info", device_dir);
1439 remove_proc_entry("state", device_dir);
1440 remove_proc_entry("brightness", device_dir);
1441 remove_proc_entry("EDID", device_dir);
1442 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1443 acpi_device_dir(device) = NULL;
1444 }
1445
1446 return 0;
1447 }
1448
1449 /* video bus */
1450 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1451 {
1452 struct acpi_video_bus *video = seq->private;
1453
1454
1455 if (!video)
1456 goto end;
1457
1458 seq_printf(seq, "Switching heads: %s\n",
1459 video->flags.multihead ? "yes" : "no");
1460 seq_printf(seq, "Video ROM: %s\n",
1461 video->flags.rom ? "yes" : "no");
1462 seq_printf(seq, "Device to be POSTed on boot: %s\n",
1463 video->flags.post ? "yes" : "no");
1464
1465 end:
1466 return 0;
1467 }
1468
1469 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1470 {
1471 return single_open(file, acpi_video_bus_info_seq_show,
1472 PDE(inode)->data);
1473 }
1474
1475 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1476 {
1477 struct acpi_video_bus *video = seq->private;
1478
1479
1480 if (!video)
1481 goto end;
1482
1483 printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1484 seq_printf(seq, "<TODO>\n");
1485
1486 end:
1487 return 0;
1488 }
1489
1490 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1491 {
1492 return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1493 }
1494
1495 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1496 {
1497 struct acpi_video_bus *video = seq->private;
1498 unsigned long long options;
1499 int status;
1500
1501
1502 if (!video)
1503 goto end;
1504
1505 status = acpi_video_bus_POST_options(video, &options);
1506 if (ACPI_SUCCESS(status)) {
1507 if (!(options & 1)) {
1508 printk(KERN_WARNING PREFIX
1509 "The motherboard VGA device is not listed as a possible POST device.\n");
1510 printk(KERN_WARNING PREFIX
1511 "This indicates a BIOS bug. Please contact the manufacturer.\n");
1512 }
1513 printk(KERN_WARNING "%llx\n", options);
1514 seq_printf(seq, "can POST: <integrated video>");
1515 if (options & 2)
1516 seq_printf(seq, " <PCI video>");
1517 if (options & 4)
1518 seq_printf(seq, " <AGP video>");
1519 seq_putc(seq, '\n');
1520 } else
1521 seq_printf(seq, "<not supported>\n");
1522 end:
1523 return 0;
1524 }
1525
1526 static int
1527 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1528 {
1529 return single_open(file, acpi_video_bus_POST_info_seq_show,
1530 PDE(inode)->data);
1531 }
1532
1533 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1534 {
1535 struct acpi_video_bus *video = seq->private;
1536 int status;
1537 unsigned long long id;
1538
1539
1540 if (!video)
1541 goto end;
1542
1543 status = acpi_video_bus_get_POST(video, &id);
1544 if (!ACPI_SUCCESS(status)) {
1545 seq_printf(seq, "<not supported>\n");
1546 goto end;
1547 }
1548 seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1549
1550 end:
1551 return 0;
1552 }
1553
1554 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1555 {
1556 struct acpi_video_bus *video = seq->private;
1557
1558
1559 seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1560
1561 return 0;
1562 }
1563
1564 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1565 {
1566 return single_open(file, acpi_video_bus_POST_seq_show,
1567 PDE(inode)->data);
1568 }
1569
1570 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1571 {
1572 return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1573 }
1574
1575 static ssize_t
1576 acpi_video_bus_write_POST(struct file *file,
1577 const char __user * buffer,
1578 size_t count, loff_t * data)
1579 {
1580 int status;
1581 struct seq_file *m = file->private_data;
1582 struct acpi_video_bus *video = m->private;
1583 char str[12] = { 0 };
1584 unsigned long long opt, options;
1585
1586
1587 if (!video || count >= sizeof(str))
1588 return -EINVAL;
1589
1590 status = acpi_video_bus_POST_options(video, &options);
1591 if (!ACPI_SUCCESS(status))
1592 return -EINVAL;
1593
1594 if (copy_from_user(str, buffer, count))
1595 return -EFAULT;
1596
1597 str[count] = 0;
1598 opt = strtoul(str, NULL, 0);
1599 if (opt > 3)
1600 return -EFAULT;
1601
1602 /* just in case an OEM 'forgot' the motherboard... */
1603 options |= 1;
1604
1605 if (options & (1ul << opt)) {
1606 status = acpi_video_bus_set_POST(video, opt);
1607 if (!ACPI_SUCCESS(status))
1608 return -EFAULT;
1609
1610 }
1611
1612 return count;
1613 }
1614
1615 static ssize_t
1616 acpi_video_bus_write_DOS(struct file *file,
1617 const char __user * buffer,
1618 size_t count, loff_t * data)
1619 {
1620 int status;
1621 struct seq_file *m = file->private_data;
1622 struct acpi_video_bus *video = m->private;
1623 char str[12] = { 0 };
1624 unsigned long opt;
1625
1626
1627 if (!video || count >= sizeof(str))
1628 return -EINVAL;
1629
1630 if (copy_from_user(str, buffer, count))
1631 return -EFAULT;
1632
1633 str[count] = 0;
1634 opt = strtoul(str, NULL, 0);
1635 if (opt > 7)
1636 return -EFAULT;
1637
1638 status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1639
1640 if (!ACPI_SUCCESS(status))
1641 return -EFAULT;
1642
1643 return count;
1644 }
1645
1646 static int acpi_video_bus_add_fs(struct acpi_device *device)
1647 {
1648 struct acpi_video_bus *video = acpi_driver_data(device);
1649 struct proc_dir_entry *device_dir;
1650 struct proc_dir_entry *entry;
1651
1652 device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1653 if (!device_dir)
1654 return -ENOMEM;
1655
1656 /* 'info' [R] */
1657 entry = proc_create_data("info", S_IRUGO, device_dir,
1658 &acpi_video_bus_info_fops,
1659 acpi_driver_data(device));
1660 if (!entry)
1661 goto err_remove_dir;
1662
1663 /* 'ROM' [R] */
1664 entry = proc_create_data("ROM", S_IRUGO, device_dir,
1665 &acpi_video_bus_ROM_fops,
1666 acpi_driver_data(device));
1667 if (!entry)
1668 goto err_remove_info;
1669
1670 /* 'POST_info' [R] */
1671 entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1672 &acpi_video_bus_POST_info_fops,
1673 acpi_driver_data(device));
1674 if (!entry)
1675 goto err_remove_rom;
1676
1677 /* 'POST' [R/W] */
1678 entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1679 device_dir,
1680 &acpi_video_bus_POST_fops,
1681 acpi_driver_data(device));
1682 if (!entry)
1683 goto err_remove_post_info;
1684
1685 /* 'DOS' [R/W] */
1686 entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1687 device_dir,
1688 &acpi_video_bus_DOS_fops,
1689 acpi_driver_data(device));
1690 if (!entry)
1691 goto err_remove_post;
1692
1693 video->dir = acpi_device_dir(device) = device_dir;
1694 return 0;
1695
1696 err_remove_post:
1697 remove_proc_entry("POST", device_dir);
1698 err_remove_post_info:
1699 remove_proc_entry("POST_info", device_dir);
1700 err_remove_rom:
1701 remove_proc_entry("ROM", device_dir);
1702 err_remove_info:
1703 remove_proc_entry("info", device_dir);
1704 err_remove_dir:
1705 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1706 return -ENOMEM;
1707 }
1708
1709 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1710 {
1711 struct proc_dir_entry *device_dir = acpi_device_dir(device);
1712
1713 if (device_dir) {
1714 remove_proc_entry("info", device_dir);
1715 remove_proc_entry("ROM", device_dir);
1716 remove_proc_entry("POST_info", device_dir);
1717 remove_proc_entry("POST", device_dir);
1718 remove_proc_entry("DOS", device_dir);
1719 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1720 acpi_device_dir(device) = NULL;
1721 }
1722
1723 return 0;
1724 }
1725
1726 /* --------------------------------------------------------------------------
1727 Driver Interface
1728 -------------------------------------------------------------------------- */
1729
1730 /* device interface */
1731 static struct acpi_video_device_attrib*
1732 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1733 {
1734 struct acpi_video_enumerated_device *ids;
1735 int i;
1736
1737 for (i = 0; i < video->attached_count; i++) {
1738 ids = &video->attached_array[i];
1739 if ((ids->value.int_val & 0xffff) == device_id)
1740 return &ids->value.attrib;
1741 }
1742
1743 return NULL;
1744 }
1745
1746 static int
1747 acpi_video_get_device_type(struct acpi_video_bus *video,
1748 unsigned long device_id)
1749 {
1750 struct acpi_video_enumerated_device *ids;
1751 int i;
1752
1753 for (i = 0; i < video->attached_count; i++) {
1754 ids = &video->attached_array[i];
1755 if ((ids->value.int_val & 0xffff) == device_id)
1756 return ids->value.int_val;
1757 }
1758
1759 return 0;
1760 }
1761
1762 static int
1763 acpi_video_bus_get_one_device(struct acpi_device *device,
1764 struct acpi_video_bus *video)
1765 {
1766 unsigned long long device_id;
1767 int status, device_type;
1768 struct acpi_video_device *data;
1769 struct acpi_video_device_attrib* attribute;
1770
1771 if (!device || !video)
1772 return -EINVAL;
1773
1774 status =
1775 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1776 if (ACPI_SUCCESS(status)) {
1777
1778 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1779 if (!data)
1780 return -ENOMEM;
1781
1782 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1783 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1784 device->driver_data = data;
1785
1786 data->device_id = device_id;
1787 data->video = video;
1788 data->dev = device;
1789
1790 attribute = acpi_video_get_device_attr(video, device_id);
1791
1792 if((attribute != NULL) && attribute->device_id_scheme) {
1793 switch (attribute->display_type) {
1794 case ACPI_VIDEO_DISPLAY_CRT:
1795 data->flags.crt = 1;
1796 break;
1797 case ACPI_VIDEO_DISPLAY_TV:
1798 data->flags.tvout = 1;
1799 break;
1800 case ACPI_VIDEO_DISPLAY_DVI:
1801 data->flags.dvi = 1;
1802 break;
1803 case ACPI_VIDEO_DISPLAY_LCD:
1804 data->flags.lcd = 1;
1805 break;
1806 default:
1807 data->flags.unknown = 1;
1808 break;
1809 }
1810 if(attribute->bios_can_detect)
1811 data->flags.bios = 1;
1812 } else {
1813 /* Check for legacy IDs */
1814 device_type = acpi_video_get_device_type(video,
1815 device_id);
1816 /* Ignore bits 16 and 18-20 */
1817 switch (device_type & 0xffe2ffff) {
1818 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1819 data->flags.crt = 1;
1820 break;
1821 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1822 data->flags.lcd = 1;
1823 break;
1824 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1825 data->flags.tvout = 1;
1826 break;
1827 default:
1828 data->flags.unknown = 1;
1829 }
1830 }
1831
1832 acpi_video_device_bind(video, data);
1833 acpi_video_device_find_cap(data);
1834
1835 status = acpi_install_notify_handler(device->handle,
1836 ACPI_DEVICE_NOTIFY,
1837 acpi_video_device_notify,
1838 data);
1839 if (ACPI_FAILURE(status)) {
1840 printk(KERN_ERR PREFIX
1841 "Error installing notify handler\n");
1842 if(data->brightness)
1843 kfree(data->brightness->levels);
1844 kfree(data->brightness);
1845 kfree(data);
1846 return -ENODEV;
1847 }
1848
1849 mutex_lock(&video->device_list_lock);
1850 list_add_tail(&data->entry, &video->video_device_list);
1851 mutex_unlock(&video->device_list_lock);
1852
1853 acpi_video_device_add_fs(device);
1854
1855 return 0;
1856 }
1857
1858 return -ENOENT;
1859 }
1860
1861 /*
1862 * Arg:
1863 * video : video bus device
1864 *
1865 * Return:
1866 * none
1867 *
1868 * Enumerate the video device list of the video bus,
1869 * bind the ids with the corresponding video devices
1870 * under the video bus.
1871 */
1872
1873 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1874 {
1875 struct acpi_video_device *dev;
1876
1877 mutex_lock(&video->device_list_lock);
1878
1879 list_for_each_entry(dev, &video->video_device_list, entry)
1880 acpi_video_device_bind(video, dev);
1881
1882 mutex_unlock(&video->device_list_lock);
1883 }
1884
1885 /*
1886 * Arg:
1887 * video : video bus device
1888 * device : video output device under the video
1889 * bus
1890 *
1891 * Return:
1892 * none
1893 *
1894 * Bind the ids with the corresponding video devices
1895 * under the video bus.
1896 */
1897
1898 static void
1899 acpi_video_device_bind(struct acpi_video_bus *video,
1900 struct acpi_video_device *device)
1901 {
1902 struct acpi_video_enumerated_device *ids;
1903 int i;
1904
1905 for (i = 0; i < video->attached_count; i++) {
1906 ids = &video->attached_array[i];
1907 if (device->device_id == (ids->value.int_val & 0xffff)) {
1908 ids->bind_info = device;
1909 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1910 }
1911 }
1912 }
1913
1914 /*
1915 * Arg:
1916 * video : video bus device
1917 *
1918 * Return:
1919 * < 0 : error
1920 *
1921 * Call _DOD to enumerate all devices attached to display adapter
1922 *
1923 */
1924
1925 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1926 {
1927 int status;
1928 int count;
1929 int i;
1930 struct acpi_video_enumerated_device *active_list;
1931 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1932 union acpi_object *dod = NULL;
1933 union acpi_object *obj;
1934
1935 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1936 if (!ACPI_SUCCESS(status)) {
1937 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1938 return status;
1939 }
1940
1941 dod = buffer.pointer;
1942 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1943 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1944 status = -EFAULT;
1945 goto out;
1946 }
1947
1948 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1949 dod->package.count));
1950
1951 active_list = kcalloc(1 + dod->package.count,
1952 sizeof(struct acpi_video_enumerated_device),
1953 GFP_KERNEL);
1954 if (!active_list) {
1955 status = -ENOMEM;
1956 goto out;
1957 }
1958
1959 count = 0;
1960 for (i = 0; i < dod->package.count; i++) {
1961 obj = &dod->package.elements[i];
1962
1963 if (obj->type != ACPI_TYPE_INTEGER) {
1964 printk(KERN_ERR PREFIX
1965 "Invalid _DOD data in element %d\n", i);
1966 continue;
1967 }
1968
1969 active_list[count].value.int_val = obj->integer.value;
1970 active_list[count].bind_info = NULL;
1971 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1972 (int)obj->integer.value));
1973 count++;
1974 }
1975
1976 kfree(video->attached_array);
1977
1978 video->attached_array = active_list;
1979 video->attached_count = count;
1980
1981 out:
1982 kfree(buffer.pointer);
1983 return status;
1984 }
1985
1986 static int
1987 acpi_video_get_next_level(struct acpi_video_device *device,
1988 u32 level_current, u32 event)
1989 {
1990 int min, max, min_above, max_below, i, l, delta = 255;
1991 max = max_below = 0;
1992 min = min_above = 255;
1993 /* Find closest level to level_current */
1994 for (i = 2; i < device->brightness->count; i++) {
1995 l = device->brightness->levels[i];
1996 if (abs(l - level_current) < abs(delta)) {
1997 delta = l - level_current;
1998 if (!delta)
1999 break;
2000 }
2001 }
2002 /* Ajust level_current to closest available level */
2003 level_current += delta;
2004 for (i = 2; i < device->brightness->count; i++) {
2005 l = device->brightness->levels[i];
2006 if (l < min)
2007 min = l;
2008 if (l > max)
2009 max = l;
2010 if (l < min_above && l > level_current)
2011 min_above = l;
2012 if (l > max_below && l < level_current)
2013 max_below = l;
2014 }
2015
2016 switch (event) {
2017 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
2018 return (level_current < max) ? min_above : min;
2019 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
2020 return (level_current < max) ? min_above : max;
2021 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
2022 return (level_current > min) ? max_below : min;
2023 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
2024 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
2025 return 0;
2026 default:
2027 return level_current;
2028 }
2029 }
2030
2031 static int
2032 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
2033 {
2034 unsigned long long level_current, level_next;
2035 int result = -EINVAL;
2036
2037 /* no warning message if acpi_backlight=vendor is used */
2038 if (!acpi_video_backlight_support())
2039 return 0;
2040
2041 if (!device->brightness)
2042 goto out;
2043
2044 result = acpi_video_device_lcd_get_level_current(device,
2045 &level_current, 0);
2046 if (result)
2047 goto out;
2048
2049 level_next = acpi_video_get_next_level(device, level_current, event);
2050
2051 result = acpi_video_device_lcd_set_level(device, level_next);
2052
2053 if (!result)
2054 backlight_force_update(device->backlight,
2055 BACKLIGHT_UPDATE_HOTKEY);
2056
2057 out:
2058 if (result)
2059 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
2060
2061 return result;
2062 }
2063
2064 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
2065 void **edid)
2066 {
2067 struct acpi_video_bus *video;
2068 struct acpi_video_device *video_device;
2069 union acpi_object *buffer = NULL;
2070 acpi_status status;
2071 int i, length;
2072
2073 if (!device || !acpi_driver_data(device))
2074 return -EINVAL;
2075
2076 video = acpi_driver_data(device);
2077
2078 for (i = 0; i < video->attached_count; i++) {
2079 video_device = video->attached_array[i].bind_info;
2080 length = 256;
2081
2082 if (!video_device)
2083 continue;
2084
2085 if (type) {
2086 switch (type) {
2087 case ACPI_VIDEO_DISPLAY_CRT:
2088 if (!video_device->flags.crt)
2089 continue;
2090 break;
2091 case ACPI_VIDEO_DISPLAY_TV:
2092 if (!video_device->flags.tvout)
2093 continue;
2094 break;
2095 case ACPI_VIDEO_DISPLAY_DVI:
2096 if (!video_device->flags.dvi)
2097 continue;
2098 break;
2099 case ACPI_VIDEO_DISPLAY_LCD:
2100 if (!video_device->flags.lcd)
2101 continue;
2102 break;
2103 }
2104 } else if (video_device->device_id != device_id) {
2105 continue;
2106 }
2107
2108 status = acpi_video_device_EDID(video_device, &buffer, length);
2109
2110 if (ACPI_FAILURE(status) || !buffer ||
2111 buffer->type != ACPI_TYPE_BUFFER) {
2112 length = 128;
2113 status = acpi_video_device_EDID(video_device, &buffer,
2114 length);
2115 if (ACPI_FAILURE(status) || !buffer ||
2116 buffer->type != ACPI_TYPE_BUFFER) {
2117 continue;
2118 }
2119 }
2120
2121 *edid = buffer->buffer.pointer;
2122 return length;
2123 }
2124
2125 return -ENODEV;
2126 }
2127 EXPORT_SYMBOL(acpi_video_get_edid);
2128
2129 static int
2130 acpi_video_bus_get_devices(struct acpi_video_bus *video,
2131 struct acpi_device *device)
2132 {
2133 int status = 0;
2134 struct acpi_device *dev;
2135
2136 acpi_video_device_enumerate(video);
2137
2138 list_for_each_entry(dev, &device->children, node) {
2139
2140 status = acpi_video_bus_get_one_device(dev, video);
2141 if (ACPI_FAILURE(status)) {
2142 printk(KERN_WARNING PREFIX
2143 "Cant attach device");
2144 continue;
2145 }
2146 }
2147 return status;
2148 }
2149
2150 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
2151 {
2152 acpi_status status;
2153 struct acpi_video_bus *video;
2154
2155
2156 if (!device || !device->video)
2157 return -ENOENT;
2158
2159 video = device->video;
2160
2161 acpi_video_device_remove_fs(device->dev);
2162
2163 status = acpi_remove_notify_handler(device->dev->handle,
2164 ACPI_DEVICE_NOTIFY,
2165 acpi_video_device_notify);
2166 if (device->backlight) {
2167 sysfs_remove_link(&device->backlight->dev.kobj, "device");
2168 backlight_device_unregister(device->backlight);
2169 device->backlight = NULL;
2170 }
2171 if (device->cooling_dev) {
2172 sysfs_remove_link(&device->dev->dev.kobj,
2173 "thermal_cooling");
2174 sysfs_remove_link(&device->cooling_dev->device.kobj,
2175 "device");
2176 thermal_cooling_device_unregister(device->cooling_dev);
2177 device->cooling_dev = NULL;
2178 }
2179 video_output_unregister(device->output_dev);
2180
2181 return 0;
2182 }
2183
2184 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2185 {
2186 int status;
2187 struct acpi_video_device *dev, *next;
2188
2189 mutex_lock(&video->device_list_lock);
2190
2191 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2192
2193 status = acpi_video_bus_put_one_device(dev);
2194 if (ACPI_FAILURE(status))
2195 printk(KERN_WARNING PREFIX
2196 "hhuuhhuu bug in acpi video driver.\n");
2197
2198 if (dev->brightness) {
2199 kfree(dev->brightness->levels);
2200 kfree(dev->brightness);
2201 }
2202 list_del(&dev->entry);
2203 kfree(dev);
2204 }
2205
2206 mutex_unlock(&video->device_list_lock);
2207
2208 return 0;
2209 }
2210
2211 /* acpi_video interface */
2212
2213 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
2214 {
2215 return acpi_video_bus_DOS(video, 0, 0);
2216 }
2217
2218 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
2219 {
2220 return acpi_video_bus_DOS(video, 0, 1);
2221 }
2222
2223 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
2224 {
2225 struct acpi_video_bus *video = acpi_driver_data(device);
2226 struct input_dev *input;
2227 int keycode = 0;
2228
2229 if (!video)
2230 return;
2231
2232 input = video->input;
2233
2234 switch (event) {
2235 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
2236 * most likely via hotkey. */
2237 acpi_bus_generate_proc_event(device, event, 0);
2238 keycode = KEY_SWITCHVIDEOMODE;
2239 break;
2240
2241 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
2242 * connector. */
2243 acpi_video_device_enumerate(video);
2244 acpi_video_device_rebind(video);
2245 acpi_bus_generate_proc_event(device, event, 0);
2246 keycode = KEY_SWITCHVIDEOMODE;
2247 break;
2248
2249 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
2250 acpi_bus_generate_proc_event(device, event, 0);
2251 keycode = KEY_SWITCHVIDEOMODE;
2252 break;
2253 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
2254 acpi_bus_generate_proc_event(device, event, 0);
2255 keycode = KEY_VIDEO_NEXT;
2256 break;
2257 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
2258 acpi_bus_generate_proc_event(device, event, 0);
2259 keycode = KEY_VIDEO_PREV;
2260 break;
2261
2262 default:
2263 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2264 "Unsupported event [0x%x]\n", event));
2265 break;
2266 }
2267
2268 acpi_notifier_call_chain(device, event, 0);
2269
2270 if (keycode) {
2271 input_report_key(input, keycode, 1);
2272 input_sync(input);
2273 input_report_key(input, keycode, 0);
2274 input_sync(input);
2275 }
2276
2277 return;
2278 }
2279
2280 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
2281 {
2282 struct acpi_video_device *video_device = data;
2283 struct acpi_device *device = NULL;
2284 struct acpi_video_bus *bus;
2285 struct input_dev *input;
2286 int keycode = 0;
2287
2288 if (!video_device)
2289 return;
2290
2291 device = video_device->dev;
2292 bus = video_device->video;
2293 input = bus->input;
2294
2295 switch (event) {
2296 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
2297 if (brightness_switch_enabled)
2298 acpi_video_switch_brightness(video_device, event);
2299 acpi_bus_generate_proc_event(device, event, 0);
2300 keycode = KEY_BRIGHTNESS_CYCLE;
2301 break;
2302 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
2303 if (brightness_switch_enabled)
2304 acpi_video_switch_brightness(video_device, event);
2305 acpi_bus_generate_proc_event(device, event, 0);
2306 keycode = KEY_BRIGHTNESSUP;
2307 break;
2308 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
2309 if (brightness_switch_enabled)
2310 acpi_video_switch_brightness(video_device, event);
2311 acpi_bus_generate_proc_event(device, event, 0);
2312 keycode = KEY_BRIGHTNESSDOWN;
2313 break;
2314 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
2315 if (brightness_switch_enabled)
2316 acpi_video_switch_brightness(video_device, event);
2317 acpi_bus_generate_proc_event(device, event, 0);
2318 keycode = KEY_BRIGHTNESS_ZERO;
2319 break;
2320 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
2321 if (brightness_switch_enabled)
2322 acpi_video_switch_brightness(video_device, event);
2323 acpi_bus_generate_proc_event(device, event, 0);
2324 keycode = KEY_DISPLAY_OFF;
2325 break;
2326 default:
2327 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2328 "Unsupported event [0x%x]\n", event));
2329 break;
2330 }
2331
2332 acpi_notifier_call_chain(device, event, 0);
2333
2334 if (keycode) {
2335 input_report_key(input, keycode, 1);
2336 input_sync(input);
2337 input_report_key(input, keycode, 0);
2338 input_sync(input);
2339 }
2340
2341 return;
2342 }
2343
2344 static int acpi_video_resume(struct notifier_block *nb,
2345 unsigned long val, void *ign)
2346 {
2347 struct acpi_video_bus *video;
2348 struct acpi_video_device *video_device;
2349 int i;
2350
2351 switch (val) {
2352 case PM_HIBERNATION_PREPARE:
2353 case PM_SUSPEND_PREPARE:
2354 case PM_RESTORE_PREPARE:
2355 return NOTIFY_DONE;
2356 }
2357
2358 video = container_of(nb, struct acpi_video_bus, pm_nb);
2359
2360 dev_info(&video->device->dev, "Restoring backlight state\n");
2361
2362 for (i = 0; i < video->attached_count; i++) {
2363 video_device = video->attached_array[i].bind_info;
2364 if (video_device && video_device->backlight)
2365 acpi_video_set_brightness(video_device->backlight);
2366 }
2367
2368 return NOTIFY_OK;
2369 }
2370
2371 static acpi_status
2372 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
2373 void **return_value)
2374 {
2375 struct acpi_device *device = context;
2376 struct acpi_device *sibling;
2377 int result;
2378
2379 if (handle == device->handle)
2380 return AE_CTRL_TERMINATE;
2381
2382 result = acpi_bus_get_device(handle, &sibling);
2383 if (result)
2384 return AE_OK;
2385
2386 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
2387 return AE_ALREADY_EXISTS;
2388
2389 return AE_OK;
2390 }
2391
2392 static int instance;
2393
2394 static int acpi_video_bus_add(struct acpi_device *device)
2395 {
2396 struct acpi_video_bus *video;
2397 struct input_dev *input;
2398 int error;
2399 acpi_status status;
2400
2401 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
2402 device->parent->handle, 1,
2403 acpi_video_bus_match, NULL,
2404 device, NULL);
2405 if (status == AE_ALREADY_EXISTS) {
2406 printk(KERN_WARNING FW_BUG
2407 "Duplicate ACPI video bus devices for the"
2408 " same VGA controller, please try module "
2409 "parameter \"video.allow_duplicates=1\""
2410 "if the current driver doesn't work.\n");
2411 if (!allow_duplicates)
2412 return -ENODEV;
2413 }
2414
2415 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2416 if (!video)
2417 return -ENOMEM;
2418
2419 /* a hack to fix the duplicate name "VID" problem on T61 */
2420 if (!strcmp(device->pnp.bus_id, "VID")) {
2421 if (instance)
2422 device->pnp.bus_id[3] = '0' + instance;
2423 instance ++;
2424 }
2425 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2426 if (!strcmp(device->pnp.bus_id, "VGA")) {
2427 if (instance)
2428 device->pnp.bus_id[3] = '0' + instance;
2429 instance++;
2430 }
2431
2432 video->device = device;
2433 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2434 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2435 device->driver_data = video;
2436
2437 acpi_video_bus_find_cap(video);
2438 error = acpi_video_bus_check(video);
2439 if (error)
2440 goto err_free_video;
2441
2442 error = acpi_video_bus_add_fs(device);
2443 if (error)
2444 goto err_free_video;
2445
2446 mutex_init(&video->device_list_lock);
2447 INIT_LIST_HEAD(&video->video_device_list);
2448
2449 acpi_video_bus_get_devices(video, device);
2450 acpi_video_bus_start_devices(video);
2451
2452 video->input = input = input_allocate_device();
2453 if (!input) {
2454 error = -ENOMEM;
2455 goto err_stop_video;
2456 }
2457
2458 snprintf(video->phys, sizeof(video->phys),
2459 "%s/video/input0", acpi_device_hid(video->device));
2460
2461 input->name = acpi_device_name(video->device);
2462 input->phys = video->phys;
2463 input->id.bustype = BUS_HOST;
2464 input->id.product = 0x06;
2465 input->dev.parent = &device->dev;
2466 input->evbit[0] = BIT(EV_KEY);
2467 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2468 set_bit(KEY_VIDEO_NEXT, input->keybit);
2469 set_bit(KEY_VIDEO_PREV, input->keybit);
2470 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2471 set_bit(KEY_BRIGHTNESSUP, input->keybit);
2472 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2473 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2474 set_bit(KEY_DISPLAY_OFF, input->keybit);
2475
2476 error = input_register_device(input);
2477 if (error)
2478 goto err_free_input_dev;
2479
2480 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
2481 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2482 video->flags.multihead ? "yes" : "no",
2483 video->flags.rom ? "yes" : "no",
2484 video->flags.post ? "yes" : "no");
2485
2486 video->pm_nb.notifier_call = acpi_video_resume;
2487 video->pm_nb.priority = 0;
2488 register_pm_notifier(&video->pm_nb);
2489
2490 return 0;
2491
2492 err_free_input_dev:
2493 input_free_device(input);
2494 err_stop_video:
2495 acpi_video_bus_stop_devices(video);
2496 acpi_video_bus_put_devices(video);
2497 kfree(video->attached_array);
2498 acpi_video_bus_remove_fs(device);
2499 err_free_video:
2500 kfree(video);
2501 device->driver_data = NULL;
2502
2503 return error;
2504 }
2505
2506 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2507 {
2508 struct acpi_video_bus *video = NULL;
2509
2510
2511 if (!device || !acpi_driver_data(device))
2512 return -EINVAL;
2513
2514 video = acpi_driver_data(device);
2515
2516 unregister_pm_notifier(&video->pm_nb);
2517
2518 acpi_video_bus_stop_devices(video);
2519 acpi_video_bus_put_devices(video);
2520 acpi_video_bus_remove_fs(device);
2521
2522 input_unregister_device(video->input);
2523 kfree(video->attached_array);
2524 kfree(video);
2525
2526 return 0;
2527 }
2528
2529 static int __init intel_opregion_present(void)
2530 {
2531 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
2532 struct pci_dev *dev = NULL;
2533 u32 address;
2534
2535 for_each_pci_dev(dev) {
2536 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2537 continue;
2538 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2539 continue;
2540 pci_read_config_dword(dev, 0xfc, &address);
2541 if (!address)
2542 continue;
2543 return 1;
2544 }
2545 #endif
2546 return 0;
2547 }
2548
2549 int acpi_video_register(void)
2550 {
2551 int result = 0;
2552 if (register_count) {
2553 /*
2554 * if the function of acpi_video_register is already called,
2555 * don't register the acpi_vide_bus again and return no error.
2556 */
2557 return 0;
2558 }
2559
2560 acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2561 if (!acpi_video_dir)
2562 return -ENODEV;
2563
2564 result = acpi_bus_register_driver(&acpi_video_bus);
2565 if (result < 0) {
2566 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2567 return -ENODEV;
2568 }
2569
2570 /*
2571 * When the acpi_video_bus is loaded successfully, increase
2572 * the counter reference.
2573 */
2574 register_count = 1;
2575
2576 return 0;
2577 }
2578 EXPORT_SYMBOL(acpi_video_register);
2579
2580 void acpi_video_unregister(void)
2581 {
2582 if (!register_count) {
2583 /*
2584 * If the acpi video bus is already unloaded, don't
2585 * unload it again and return directly.
2586 */
2587 return;
2588 }
2589 acpi_bus_unregister_driver(&acpi_video_bus);
2590
2591 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2592
2593 register_count = 0;
2594
2595 return;
2596 }
2597 EXPORT_SYMBOL(acpi_video_unregister);
2598
2599 /*
2600 * This is kind of nasty. Hardware using Intel chipsets may require
2601 * the video opregion code to be run first in order to initialise
2602 * state before any ACPI video calls are made. To handle this we defer
2603 * registration of the video class until the opregion code has run.
2604 */
2605
2606 static int __init acpi_video_init(void)
2607 {
2608 dmi_check_system(video_dmi_table);
2609
2610 if (intel_opregion_present())
2611 return 0;
2612
2613 return acpi_video_register();
2614 }
2615
2616 static void __exit acpi_video_exit(void)
2617 {
2618 acpi_video_unregister();
2619
2620 return;
2621 }
2622
2623 module_init(acpi_video_init);
2624 module_exit(acpi_video_exit);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree