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net/can bugfix: use after free bug in can protocol drivers
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / acpi / video.c
blob8851315ce858a2e2eb1e4ffd2d2b6b695fa8bfb8
1 /*
2 * video.c - ACPI Video Driver ($Revision:$)
3 *
4 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
5 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
6 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
7 *
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23 *
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 */
26
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/types.h>
31 #include <linux/list.h>
32 #include <linux/mutex.h>
33 #include <linux/proc_fs.h>
34 #include <linux/seq_file.h>
35 #include <linux/input.h>
36 #include <linux/backlight.h>
37 #include <linux/thermal.h>
38 #include <linux/video_output.h>
39 #include <linux/sort.h>
40 #include <linux/pci.h>
41 #include <linux/pci_ids.h>
42 #include <asm/uaccess.h>
43
44 #include <acpi/acpi_bus.h>
45 #include <acpi/acpi_drivers.h>
46
47 #define ACPI_VIDEO_CLASS "video"
48 #define ACPI_VIDEO_BUS_NAME "Video Bus"
49 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
50 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
51 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
52 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
53 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
54 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
55
56 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
57 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
58 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
59 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
60 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
61
62 #define MAX_NAME_LEN 20
63
64 #define ACPI_VIDEO_DISPLAY_CRT 1
65 #define ACPI_VIDEO_DISPLAY_TV 2
66 #define ACPI_VIDEO_DISPLAY_DVI 3
67 #define ACPI_VIDEO_DISPLAY_LCD 4
68
69 #define _COMPONENT ACPI_VIDEO_COMPONENT
70 ACPI_MODULE_NAME("video");
71
72 MODULE_AUTHOR("Bruno Ducrot");
73 MODULE_DESCRIPTION("ACPI Video Driver");
74 MODULE_LICENSE("GPL");
75
76 static int brightness_switch_enabled = 1;
77 module_param(brightness_switch_enabled, bool, 0644);
78
79 static int register_count = 0;
80 static int acpi_video_bus_add(struct acpi_device *device);
81 static int acpi_video_bus_remove(struct acpi_device *device, int type);
82 static int acpi_video_resume(struct acpi_device *device);
83 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
84
85 static const struct acpi_device_id video_device_ids[] = {
86 {ACPI_VIDEO_HID, 0},
87 {"", 0},
88 };
89 MODULE_DEVICE_TABLE(acpi, video_device_ids);
90
91 static struct acpi_driver acpi_video_bus = {
92 .name = "video",
93 .class = ACPI_VIDEO_CLASS,
94 .ids = video_device_ids,
95 .ops = {
96 .add = acpi_video_bus_add,
97 .remove = acpi_video_bus_remove,
98 .resume = acpi_video_resume,
99 .notify = acpi_video_bus_notify,
100 },
101 };
102
103 struct acpi_video_bus_flags {
104 u8 multihead:1; /* can switch video heads */
105 u8 rom:1; /* can retrieve a video rom */
106 u8 post:1; /* can configure the head to */
107 u8 reserved:5;
108 };
109
110 struct acpi_video_bus_cap {
111 u8 _DOS:1; /*Enable/Disable output switching */
112 u8 _DOD:1; /*Enumerate all devices attached to display adapter */
113 u8 _ROM:1; /*Get ROM Data */
114 u8 _GPD:1; /*Get POST Device */
115 u8 _SPD:1; /*Set POST Device */
116 u8 _VPO:1; /*Video POST Options */
117 u8 reserved:2;
118 };
119
120 struct acpi_video_device_attrib {
121 u32 display_index:4; /* A zero-based instance of the Display */
122 u32 display_port_attachment:4; /*This field differentiates the display type */
123 u32 display_type:4; /*Describe the specific type in use */
124 u32 vendor_specific:4; /*Chipset Vendor Specific */
125 u32 bios_can_detect:1; /*BIOS can detect the device */
126 u32 depend_on_vga:1; /*Non-VGA output device whose power is related to
127 the VGA device. */
128 u32 pipe_id:3; /*For VGA multiple-head devices. */
129 u32 reserved:10; /*Must be 0 */
130 u32 device_id_scheme:1; /*Device ID Scheme */
131 };
132
133 struct acpi_video_enumerated_device {
134 union {
135 u32 int_val;
136 struct acpi_video_device_attrib attrib;
137 } value;
138 struct acpi_video_device *bind_info;
139 };
140
141 struct acpi_video_bus {
142 struct acpi_device *device;
143 u8 dos_setting;
144 struct acpi_video_enumerated_device *attached_array;
145 u8 attached_count;
146 struct acpi_video_bus_cap cap;
147 struct acpi_video_bus_flags flags;
148 struct list_head video_device_list;
149 struct mutex device_list_lock; /* protects video_device_list */
150 struct proc_dir_entry *dir;
151 struct input_dev *input;
152 char phys[32]; /* for input device */
153 };
154
155 struct acpi_video_device_flags {
156 u8 crt:1;
157 u8 lcd:1;
158 u8 tvout:1;
159 u8 dvi:1;
160 u8 bios:1;
161 u8 unknown:1;
162 u8 reserved:2;
163 };
164
165 struct acpi_video_device_cap {
166 u8 _ADR:1; /*Return the unique ID */
167 u8 _BCL:1; /*Query list of brightness control levels supported */
168 u8 _BCM:1; /*Set the brightness level */
169 u8 _BQC:1; /* Get current brightness level */
170 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
171 u8 _DDC:1; /*Return the EDID for this device */
172 u8 _DCS:1; /*Return status of output device */
173 u8 _DGS:1; /*Query graphics state */
174 u8 _DSS:1; /*Device state set */
175 };
176
177 struct acpi_video_brightness_flags {
178 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
179 u8 _BCL_reversed:1; /* _BCL package is in a reversed order*/
180 u8 _BCL_use_index:1; /* levels in _BCL are index values */
181 u8 _BCM_use_index:1; /* input of _BCM is an index value */
182 u8 _BQC_use_index:1; /* _BQC returns an index value */
183 };
184
185 struct acpi_video_device_brightness {
186 int curr;
187 int count;
188 int *levels;
189 struct acpi_video_brightness_flags flags;
190 };
191
192 struct acpi_video_device {
193 unsigned long device_id;
194 struct acpi_video_device_flags flags;
195 struct acpi_video_device_cap cap;
196 struct list_head entry;
197 struct acpi_video_bus *video;
198 struct acpi_device *dev;
199 struct acpi_video_device_brightness *brightness;
200 struct backlight_device *backlight;
201 struct thermal_cooling_device *cdev;
202 struct output_device *output_dev;
203 };
204
205 /* bus */
206 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
207 static const struct file_operations acpi_video_bus_info_fops = {
208 .owner = THIS_MODULE,
209 .open = acpi_video_bus_info_open_fs,
210 .read = seq_read,
211 .llseek = seq_lseek,
212 .release = single_release,
213 };
214
215 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
216 static const struct file_operations acpi_video_bus_ROM_fops = {
217 .owner = THIS_MODULE,
218 .open = acpi_video_bus_ROM_open_fs,
219 .read = seq_read,
220 .llseek = seq_lseek,
221 .release = single_release,
222 };
223
224 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
225 struct file *file);
226 static const struct file_operations acpi_video_bus_POST_info_fops = {
227 .owner = THIS_MODULE,
228 .open = acpi_video_bus_POST_info_open_fs,
229 .read = seq_read,
230 .llseek = seq_lseek,
231 .release = single_release,
232 };
233
234 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
235 static ssize_t acpi_video_bus_write_POST(struct file *file,
236 const char __user *buffer, size_t count, loff_t *data);
237 static const struct file_operations acpi_video_bus_POST_fops = {
238 .owner = THIS_MODULE,
239 .open = acpi_video_bus_POST_open_fs,
240 .read = seq_read,
241 .write = acpi_video_bus_write_POST,
242 .llseek = seq_lseek,
243 .release = single_release,
244 };
245
246 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
247 static ssize_t acpi_video_bus_write_DOS(struct file *file,
248 const char __user *buffer, size_t count, loff_t *data);
249 static const struct file_operations acpi_video_bus_DOS_fops = {
250 .owner = THIS_MODULE,
251 .open = acpi_video_bus_DOS_open_fs,
252 .read = seq_read,
253 .write = acpi_video_bus_write_DOS,
254 .llseek = seq_lseek,
255 .release = single_release,
256 };
257
258 /* device */
259 static int acpi_video_device_info_open_fs(struct inode *inode,
260 struct file *file);
261 static const struct file_operations acpi_video_device_info_fops = {
262 .owner = THIS_MODULE,
263 .open = acpi_video_device_info_open_fs,
264 .read = seq_read,
265 .llseek = seq_lseek,
266 .release = single_release,
267 };
268
269 static int acpi_video_device_state_open_fs(struct inode *inode,
270 struct file *file);
271 static ssize_t acpi_video_device_write_state(struct file *file,
272 const char __user *buffer, size_t count, loff_t *data);
273 static const struct file_operations acpi_video_device_state_fops = {
274 .owner = THIS_MODULE,
275 .open = acpi_video_device_state_open_fs,
276 .read = seq_read,
277 .write = acpi_video_device_write_state,
278 .llseek = seq_lseek,
279 .release = single_release,
280 };
281
282 static int acpi_video_device_brightness_open_fs(struct inode *inode,
283 struct file *file);
284 static ssize_t acpi_video_device_write_brightness(struct file *file,
285 const char __user *buffer, size_t count, loff_t *data);
286 static struct file_operations acpi_video_device_brightness_fops = {
287 .owner = THIS_MODULE,
288 .open = acpi_video_device_brightness_open_fs,
289 .read = seq_read,
290 .write = acpi_video_device_write_brightness,
291 .llseek = seq_lseek,
292 .release = single_release,
293 };
294
295 static int acpi_video_device_EDID_open_fs(struct inode *inode,
296 struct file *file);
297 static const struct file_operations acpi_video_device_EDID_fops = {
298 .owner = THIS_MODULE,
299 .open = acpi_video_device_EDID_open_fs,
300 .read = seq_read,
301 .llseek = seq_lseek,
302 .release = single_release,
303 };
304
305 static const char device_decode[][30] = {
306 "motherboard VGA device",
307 "PCI VGA device",
308 "AGP VGA device",
309 "UNKNOWN",
310 };
311
312 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
313 static void acpi_video_device_rebind(struct acpi_video_bus *video);
314 static void acpi_video_device_bind(struct acpi_video_bus *video,
315 struct acpi_video_device *device);
316 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
317 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
318 int level);
319 static int acpi_video_device_lcd_get_level_current(
320 struct acpi_video_device *device,
321 unsigned long long *level);
322 static int acpi_video_get_next_level(struct acpi_video_device *device,
323 u32 level_current, u32 event);
324 static int acpi_video_switch_brightness(struct acpi_video_device *device,
325 int event);
326 static int acpi_video_device_get_state(struct acpi_video_device *device,
327 unsigned long long *state);
328 static int acpi_video_output_get(struct output_device *od);
329 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
330
331 /*backlight device sysfs support*/
332 static int acpi_video_get_brightness(struct backlight_device *bd)
333 {
334 unsigned long long cur_level;
335 int i;
336 struct acpi_video_device *vd =
337 (struct acpi_video_device *)bl_get_data(bd);
338
339 if (acpi_video_device_lcd_get_level_current(vd, &cur_level))
340 return -EINVAL;
341 for (i = 2; i < vd->brightness->count; i++) {
342 if (vd->brightness->levels[i] == cur_level)
343 /* The first two entries are special - see page 575
344 of the ACPI spec 3.0 */
345 return i-2;
346 }
347 return 0;
348 }
349
350 static int acpi_video_set_brightness(struct backlight_device *bd)
351 {
352 int request_level = bd->props.brightness + 2;
353 struct acpi_video_device *vd =
354 (struct acpi_video_device *)bl_get_data(bd);
355
356 return acpi_video_device_lcd_set_level(vd,
357 vd->brightness->levels[request_level]);
358 }
359
360 static struct backlight_ops acpi_backlight_ops = {
361 .get_brightness = acpi_video_get_brightness,
362 .update_status = acpi_video_set_brightness,
363 };
364
365 /*video output device sysfs support*/
366 static int acpi_video_output_get(struct output_device *od)
367 {
368 unsigned long long state;
369 struct acpi_video_device *vd =
370 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
371 acpi_video_device_get_state(vd, &state);
372 return (int)state;
373 }
374
375 static int acpi_video_output_set(struct output_device *od)
376 {
377 unsigned long state = od->request_state;
378 struct acpi_video_device *vd=
379 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
380 return acpi_video_device_set_state(vd, state);
381 }
382
383 static struct output_properties acpi_output_properties = {
384 .set_state = acpi_video_output_set,
385 .get_status = acpi_video_output_get,
386 };
387
388
389 /* thermal cooling device callbacks */
390 static int video_get_max_state(struct thermal_cooling_device *cdev, unsigned
391 long *state)
392 {
393 struct acpi_device *device = cdev->devdata;
394 struct acpi_video_device *video = acpi_driver_data(device);
395
396 *state = video->brightness->count - 3;
397 return 0;
398 }
399
400 static int video_get_cur_state(struct thermal_cooling_device *cdev, unsigned
401 long *state)
402 {
403 struct acpi_device *device = cdev->devdata;
404 struct acpi_video_device *video = acpi_driver_data(device);
405 unsigned long long level;
406 int offset;
407
408 if (acpi_video_device_lcd_get_level_current(video, &level))
409 return -EINVAL;
410 for (offset = 2; offset < video->brightness->count; offset++)
411 if (level == video->brightness->levels[offset]) {
412 *state = video->brightness->count - offset - 1;
413 return 0;
414 }
415
416 return -EINVAL;
417 }
418
419 static int
420 video_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
421 {
422 struct acpi_device *device = cdev->devdata;
423 struct acpi_video_device *video = acpi_driver_data(device);
424 int level;
425
426 if ( state >= video->brightness->count - 2)
427 return -EINVAL;
428
429 state = video->brightness->count - state;
430 level = video->brightness->levels[state -1];
431 return acpi_video_device_lcd_set_level(video, level);
432 }
433
434 static struct thermal_cooling_device_ops video_cooling_ops = {
435 .get_max_state = video_get_max_state,
436 .get_cur_state = video_get_cur_state,
437 .set_cur_state = video_set_cur_state,
438 };
439
440 /* --------------------------------------------------------------------------
441 Video Management
442 -------------------------------------------------------------------------- */
443
444 /* device */
445
446 static int
447 acpi_video_device_query(struct acpi_video_device *device, unsigned long long *state)
448 {
449 int status;
450
451 status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
452
453 return status;
454 }
455
456 static int
457 acpi_video_device_get_state(struct acpi_video_device *device,
458 unsigned long long *state)
459 {
460 int status;
461
462 status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
463
464 return status;
465 }
466
467 static int
468 acpi_video_device_set_state(struct acpi_video_device *device, int state)
469 {
470 int status;
471 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
472 struct acpi_object_list args = { 1, &arg0 };
473 unsigned long long ret;
474
475
476 arg0.integer.value = state;
477 status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
478
479 return status;
480 }
481
482 static int
483 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
484 union acpi_object **levels)
485 {
486 int status;
487 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
488 union acpi_object *obj;
489
490
491 *levels = NULL;
492
493 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
494 if (!ACPI_SUCCESS(status))
495 return status;
496 obj = (union acpi_object *)buffer.pointer;
497 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
498 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
499 status = -EFAULT;
500 goto err;
501 }
502
503 *levels = obj;
504
505 return 0;
506
507 err:
508 kfree(buffer.pointer);
509
510 return status;
511 }
512
513 static int
514 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
515 {
516 int status;
517 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
518 struct acpi_object_list args = { 1, &arg0 };
519 int state;
520
521 arg0.integer.value = level;
522
523 status = acpi_evaluate_object(device->dev->handle, "_BCM",
524 &args, NULL);
525 if (ACPI_FAILURE(status)) {
526 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
527 return -EIO;
528 }
529
530 device->brightness->curr = level;
531 for (state = 2; state < device->brightness->count; state++)
532 if (level == device->brightness->levels[state]) {
533 if (device->backlight)
534 device->backlight->props.brightness = state - 2;
535 return 0;
536 }
537
538 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
539 return -EINVAL;
540 }
541
542 /*
543 * For some buggy _BQC methods, we need to add a constant value to
544 * the _BQC return value to get the actual current brightness level
545 */
546
547 static int bqc_offset_aml_bug_workaround;
548 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
549 {
550 bqc_offset_aml_bug_workaround = 9;
551 return 0;
552 }
553
554 static struct dmi_system_id video_dmi_table[] __initdata = {
555 /*
556 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
557 */
558 {
559 .callback = video_set_bqc_offset,
560 .ident = "Acer Aspire 5720",
561 .matches = {
562 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
563 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
564 },
565 },
566 {
567 .callback = video_set_bqc_offset,
568 .ident = "Acer Aspire 5710Z",
569 .matches = {
570 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
571 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
572 },
573 },
574 {
575 .callback = video_set_bqc_offset,
576 .ident = "eMachines E510",
577 .matches = {
578 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
579 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
580 },
581 },
582 {
583 .callback = video_set_bqc_offset,
584 .ident = "Acer Aspire 5315",
585 .matches = {
586 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
587 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
588 },
589 },
590 {
591 .callback = video_set_bqc_offset,
592 .ident = "Acer Aspire 7720",
593 .matches = {
594 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
595 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
596 },
597 },
598 {}
599 };
600
601 static int
602 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
603 unsigned long long *level)
604 {
605 acpi_status status = AE_OK;
606
607 if (device->cap._BQC || device->cap._BCQ) {
608 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
609
610 status = acpi_evaluate_integer(device->dev->handle, buf,
611 NULL, level);
612 if (ACPI_SUCCESS(status)) {
613 if (device->brightness->flags._BQC_use_index) {
614 if (device->brightness->flags._BCL_reversed)
615 *level = device->brightness->count
616 - 3 - (*level);
617 *level = device->brightness->levels[*level + 2];
618
619 }
620 *level += bqc_offset_aml_bug_workaround;
621 device->brightness->curr = *level;
622 return 0;
623 } else {
624 /* Fixme:
625 * should we return an error or ignore this failure?
626 * dev->brightness->curr is a cached value which stores
627 * the correct current backlight level in most cases.
628 * ACPI video backlight still works w/ buggy _BQC.
629 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
630 */
631 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
632 device->cap._BQC = device->cap._BCQ = 0;
633 }
634 }
635
636 *level = device->brightness->curr;
637 return 0;
638 }
639
640 static int
641 acpi_video_device_EDID(struct acpi_video_device *device,
642 union acpi_object **edid, ssize_t length)
643 {
644 int status;
645 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
646 union acpi_object *obj;
647 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
648 struct acpi_object_list args = { 1, &arg0 };
649
650
651 *edid = NULL;
652
653 if (!device)
654 return -ENODEV;
655 if (length == 128)
656 arg0.integer.value = 1;
657 else if (length == 256)
658 arg0.integer.value = 2;
659 else
660 return -EINVAL;
661
662 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
663 if (ACPI_FAILURE(status))
664 return -ENODEV;
665
666 obj = buffer.pointer;
667
668 if (obj && obj->type == ACPI_TYPE_BUFFER)
669 *edid = obj;
670 else {
671 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
672 status = -EFAULT;
673 kfree(obj);
674 }
675
676 return status;
677 }
678
679 /* bus */
680
681 static int
682 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
683 {
684 int status;
685 unsigned long long tmp;
686 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
687 struct acpi_object_list args = { 1, &arg0 };
688
689
690 arg0.integer.value = option;
691
692 status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
693 if (ACPI_SUCCESS(status))
694 status = tmp ? (-EINVAL) : (AE_OK);
695
696 return status;
697 }
698
699 static int
700 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long long *id)
701 {
702 int status;
703
704 status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
705
706 return status;
707 }
708
709 static int
710 acpi_video_bus_POST_options(struct acpi_video_bus *video,
711 unsigned long long *options)
712 {
713 int status;
714
715 status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
716 *options &= 3;
717
718 return status;
719 }
720
721 /*
722 * Arg:
723 * video : video bus device pointer
724 * bios_flag :
725 * 0. The system BIOS should NOT automatically switch(toggle)
726 * the active display output.
727 * 1. The system BIOS should automatically switch (toggle) the
728 * active display output. No switch event.
729 * 2. The _DGS value should be locked.
730 * 3. The system BIOS should not automatically switch (toggle) the
731 * active display output, but instead generate the display switch
732 * event notify code.
733 * lcd_flag :
734 * 0. The system BIOS should automatically control the brightness level
735 * of the LCD when the power changes from AC to DC
736 * 1. The system BIOS should NOT automatically control the brightness
737 * level of the LCD when the power changes from AC to DC.
738 * Return Value:
739 * -1 wrong arg.
740 */
741
742 static int
743 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
744 {
745 acpi_integer status = 0;
746 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
747 struct acpi_object_list args = { 1, &arg0 };
748
749
750 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
751 status = -1;
752 goto Failed;
753 }
754 arg0.integer.value = (lcd_flag << 2) | bios_flag;
755 video->dos_setting = arg0.integer.value;
756 acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
757
758 Failed:
759 return status;
760 }
761
762 /*
763 * Simple comparison function used to sort backlight levels.
764 */
765
766 static int
767 acpi_video_cmp_level(const void *a, const void *b)
768 {
769 return *(int *)a - *(int *)b;
770 }
771
772 /*
773 * Arg:
774 * device : video output device (LCD, CRT, ..)
775 *
776 * Return Value:
777 * Maximum brightness level
778 *
779 * Allocate and initialize device->brightness.
780 */
781
782 static int
783 acpi_video_init_brightness(struct acpi_video_device *device)
784 {
785 union acpi_object *obj = NULL;
786 int i, max_level = 0, count = 0, level_ac_battery = 0;
787 unsigned long long level, level_old;
788 union acpi_object *o;
789 struct acpi_video_device_brightness *br = NULL;
790 int result = -EINVAL;
791
792 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
793 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
794 "LCD brightness level\n"));
795 goto out;
796 }
797
798 if (obj->package.count < 2)
799 goto out;
800
801 br = kzalloc(sizeof(*br), GFP_KERNEL);
802 if (!br) {
803 printk(KERN_ERR "can't allocate memory\n");
804 result = -ENOMEM;
805 goto out;
806 }
807
808 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
809 GFP_KERNEL);
810 if (!br->levels) {
811 result = -ENOMEM;
812 goto out_free;
813 }
814
815 for (i = 0; i < obj->package.count; i++) {
816 o = (union acpi_object *)&obj->package.elements[i];
817 if (o->type != ACPI_TYPE_INTEGER) {
818 printk(KERN_ERR PREFIX "Invalid data\n");
819 continue;
820 }
821 br->levels[count] = (u32) o->integer.value;
822
823 if (br->levels[count] > max_level)
824 max_level = br->levels[count];
825 count++;
826 }
827
828 /*
829 * some buggy BIOS don't export the levels
830 * when machine is on AC/Battery in _BCL package.
831 * In this case, the first two elements in _BCL packages
832 * are also supported brightness levels that OS should take care of.
833 */
834 for (i = 2; i < count; i++) {
835 if (br->levels[i] == br->levels[0])
836 level_ac_battery++;
837 if (br->levels[i] == br->levels[1])
838 level_ac_battery++;
839 }
840
841 if (level_ac_battery < 2) {
842 level_ac_battery = 2 - level_ac_battery;
843 br->flags._BCL_no_ac_battery_levels = 1;
844 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
845 br->levels[i] = br->levels[i - level_ac_battery];
846 count += level_ac_battery;
847 } else if (level_ac_battery > 2)
848 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
849
850 /* Check if the _BCL package is in a reversed order */
851 if (max_level == br->levels[2]) {
852 br->flags._BCL_reversed = 1;
853 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
854 acpi_video_cmp_level, NULL);
855 } else if (max_level != br->levels[count - 1])
856 ACPI_ERROR((AE_INFO,
857 "Found unordered _BCL package\n"));
858
859 br->count = count;
860 device->brightness = br;
861
862 /* Check the input/output of _BQC/_BCL/_BCM */
863 if ((max_level < 100) && (max_level <= (count - 2)))
864 br->flags._BCL_use_index = 1;
865
866 /*
867 * _BCM is always consistent with _BCL,
868 * at least for all the laptops we have ever seen.
869 */
870 br->flags._BCM_use_index = br->flags._BCL_use_index;
871
872 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
873 br->curr = level_old = max_level;
874
875 if (!device->cap._BQC)
876 goto set_level;
877
878 result = acpi_video_device_lcd_get_level_current(device, &level_old);
879 if (result)
880 goto out_free_levels;
881
882 /*
883 * Set the level to maximum and check if _BQC uses indexed value
884 */
885 result = acpi_video_device_lcd_set_level(device, max_level);
886 if (result)
887 goto out_free_levels;
888
889 result = acpi_video_device_lcd_get_level_current(device, &level);
890 if (result)
891 goto out_free_levels;
892
893 br->flags._BQC_use_index = (level == max_level ? 0 : 1);
894
895 if (!br->flags._BQC_use_index)
896 goto set_level;
897
898 if (br->flags._BCL_reversed)
899 level_old = (br->count - 1) - level_old;
900 level_old = br->levels[level_old];
901
902 set_level:
903 result = acpi_video_device_lcd_set_level(device, level_old);
904 if (result)
905 goto out_free_levels;
906
907 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
908 "found %d brightness levels\n", count - 2));
909 kfree(obj);
910 return result;
911
912 out_free_levels:
913 kfree(br->levels);
914 out_free:
915 kfree(br);
916 out:
917 device->brightness = NULL;
918 kfree(obj);
919 return result;
920 }
921
922 /*
923 * Arg:
924 * device : video output device (LCD, CRT, ..)
925 *
926 * Return Value:
927 * None
928 *
929 * Find out all required AML methods defined under the output
930 * device.
931 */
932
933 static void acpi_video_device_find_cap(struct acpi_video_device *device)
934 {
935 acpi_handle h_dummy1;
936
937
938 memset(&device->cap, 0, sizeof(device->cap));
939
940 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
941 device->cap._ADR = 1;
942 }
943 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
944 device->cap._BCL = 1;
945 }
946 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
947 device->cap._BCM = 1;
948 }
949 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
950 device->cap._BQC = 1;
951 else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
952 &h_dummy1))) {
953 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
954 device->cap._BCQ = 1;
955 }
956
957 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
958 device->cap._DDC = 1;
959 }
960 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
961 device->cap._DCS = 1;
962 }
963 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
964 device->cap._DGS = 1;
965 }
966 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
967 device->cap._DSS = 1;
968 }
969
970 if (acpi_video_backlight_support()) {
971 int result;
972 static int count = 0;
973 char *name;
974
975 result = acpi_video_init_brightness(device);
976 if (result)
977 return;
978 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
979 if (!name)
980 return;
981
982 sprintf(name, "acpi_video%d", count++);
983 device->backlight = backlight_device_register(name,
984 NULL, device, &acpi_backlight_ops);
985 device->backlight->props.max_brightness = device->brightness->count-3;
986 kfree(name);
987
988 result = sysfs_create_link(&device->backlight->dev.kobj,
989 &device->dev->dev.kobj, "device");
990 if (result)
991 printk(KERN_ERR PREFIX "Create sysfs link\n");
992
993 device->cdev = thermal_cooling_device_register("LCD",
994 device->dev, &video_cooling_ops);
995 if (IS_ERR(device->cdev))
996 return;
997
998 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
999 device->cdev->id);
1000 result = sysfs_create_link(&device->dev->dev.kobj,
1001 &device->cdev->device.kobj,
1002 "thermal_cooling");
1003 if (result)
1004 printk(KERN_ERR PREFIX "Create sysfs link\n");
1005 result = sysfs_create_link(&device->cdev->device.kobj,
1006 &device->dev->dev.kobj, "device");
1007 if (result)
1008 printk(KERN_ERR PREFIX "Create sysfs link\n");
1009
1010 }
1011
1012 if (acpi_video_display_switch_support()) {
1013
1014 if (device->cap._DCS && device->cap._DSS) {
1015 static int count;
1016 char *name;
1017 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
1018 if (!name)
1019 return;
1020 sprintf(name, "acpi_video%d", count++);
1021 device->output_dev = video_output_register(name,
1022 NULL, device, &acpi_output_properties);
1023 kfree(name);
1024 }
1025 }
1026 }
1027
1028 /*
1029 * Arg:
1030 * device : video output device (VGA)
1031 *
1032 * Return Value:
1033 * None
1034 *
1035 * Find out all required AML methods defined under the video bus device.
1036 */
1037
1038 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1039 {
1040 acpi_handle h_dummy1;
1041
1042 memset(&video->cap, 0, sizeof(video->cap));
1043 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
1044 video->cap._DOS = 1;
1045 }
1046 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
1047 video->cap._DOD = 1;
1048 }
1049 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
1050 video->cap._ROM = 1;
1051 }
1052 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
1053 video->cap._GPD = 1;
1054 }
1055 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
1056 video->cap._SPD = 1;
1057 }
1058 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
1059 video->cap._VPO = 1;
1060 }
1061 }
1062
1063 /*
1064 * Check whether the video bus device has required AML method to
1065 * support the desired features
1066 */
1067
1068 static int acpi_video_bus_check(struct acpi_video_bus *video)
1069 {
1070 acpi_status status = -ENOENT;
1071 struct pci_dev *dev;
1072
1073 if (!video)
1074 return -EINVAL;
1075
1076 dev = acpi_get_pci_dev(video->device->handle);
1077 if (!dev)
1078 return -ENODEV;
1079 pci_dev_put(dev);
1080
1081 /* Since there is no HID, CID and so on for VGA driver, we have
1082 * to check well known required nodes.
1083 */
1084
1085 /* Does this device support video switching? */
1086 if (video->cap._DOS) {
1087 video->flags.multihead = 1;
1088 status = 0;
1089 }
1090
1091 /* Does this device support retrieving a video ROM? */
1092 if (video->cap._ROM) {
1093 video->flags.rom = 1;
1094 status = 0;
1095 }
1096
1097 /* Does this device support configuring which video device to POST? */
1098 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1099 video->flags.post = 1;
1100 status = 0;
1101 }
1102
1103 return status;
1104 }
1105
1106 /* --------------------------------------------------------------------------
1107 FS Interface (/proc)
1108 -------------------------------------------------------------------------- */
1109
1110 static struct proc_dir_entry *acpi_video_dir;
1111
1112 /* video devices */
1113
1114 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
1115 {
1116 struct acpi_video_device *dev = seq->private;
1117
1118
1119 if (!dev)
1120 goto end;
1121
1122 seq_printf(seq, "device_id: 0x%04x\n", (u32) dev->device_id);
1123 seq_printf(seq, "type: ");
1124 if (dev->flags.crt)
1125 seq_printf(seq, "CRT\n");
1126 else if (dev->flags.lcd)
1127 seq_printf(seq, "LCD\n");
1128 else if (dev->flags.tvout)
1129 seq_printf(seq, "TVOUT\n");
1130 else if (dev->flags.dvi)
1131 seq_printf(seq, "DVI\n");
1132 else
1133 seq_printf(seq, "UNKNOWN\n");
1134
1135 seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
1136
1137 end:
1138 return 0;
1139 }
1140
1141 static int
1142 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
1143 {
1144 return single_open(file, acpi_video_device_info_seq_show,
1145 PDE(inode)->data);
1146 }
1147
1148 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
1149 {
1150 int status;
1151 struct acpi_video_device *dev = seq->private;
1152 unsigned long long state;
1153
1154
1155 if (!dev)
1156 goto end;
1157
1158 status = acpi_video_device_get_state(dev, &state);
1159 seq_printf(seq, "state: ");
1160 if (ACPI_SUCCESS(status))
1161 seq_printf(seq, "0x%02llx\n", state);
1162 else
1163 seq_printf(seq, "<not supported>\n");
1164
1165 status = acpi_video_device_query(dev, &state);
1166 seq_printf(seq, "query: ");
1167 if (ACPI_SUCCESS(status))
1168 seq_printf(seq, "0x%02llx\n", state);
1169 else
1170 seq_printf(seq, "<not supported>\n");
1171
1172 end:
1173 return 0;
1174 }
1175
1176 static int
1177 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
1178 {
1179 return single_open(file, acpi_video_device_state_seq_show,
1180 PDE(inode)->data);
1181 }
1182
1183 static ssize_t
1184 acpi_video_device_write_state(struct file *file,
1185 const char __user * buffer,
1186 size_t count, loff_t * data)
1187 {
1188 int status;
1189 struct seq_file *m = file->private_data;
1190 struct acpi_video_device *dev = m->private;
1191 char str[12] = { 0 };
1192 u32 state = 0;
1193
1194
1195 if (!dev || count + 1 > sizeof str)
1196 return -EINVAL;
1197
1198 if (copy_from_user(str, buffer, count))
1199 return -EFAULT;
1200
1201 str[count] = 0;
1202 state = simple_strtoul(str, NULL, 0);
1203 state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
1204
1205 status = acpi_video_device_set_state(dev, state);
1206
1207 if (status)
1208 return -EFAULT;
1209
1210 return count;
1211 }
1212
1213 static int
1214 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
1215 {
1216 struct acpi_video_device *dev = seq->private;
1217 int i;
1218
1219
1220 if (!dev || !dev->brightness) {
1221 seq_printf(seq, "<not supported>\n");
1222 return 0;
1223 }
1224
1225 seq_printf(seq, "levels: ");
1226 for (i = 2; i < dev->brightness->count; i++)
1227 seq_printf(seq, " %d", dev->brightness->levels[i]);
1228 seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
1229
1230 return 0;
1231 }
1232
1233 static int
1234 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1235 {
1236 return single_open(file, acpi_video_device_brightness_seq_show,
1237 PDE(inode)->data);
1238 }
1239
1240 static ssize_t
1241 acpi_video_device_write_brightness(struct file *file,
1242 const char __user * buffer,
1243 size_t count, loff_t * data)
1244 {
1245 struct seq_file *m = file->private_data;
1246 struct acpi_video_device *dev = m->private;
1247 char str[5] = { 0 };
1248 unsigned int level = 0;
1249 int i;
1250
1251
1252 if (!dev || !dev->brightness || count + 1 > sizeof str)
1253 return -EINVAL;
1254
1255 if (copy_from_user(str, buffer, count))
1256 return -EFAULT;
1257
1258 str[count] = 0;
1259 level = simple_strtoul(str, NULL, 0);
1260
1261 if (level > 100)
1262 return -EFAULT;
1263
1264 /* validate through the list of available levels */
1265 for (i = 2; i < dev->brightness->count; i++)
1266 if (level == dev->brightness->levels[i]) {
1267 if (!acpi_video_device_lcd_set_level(dev, level))
1268 return count;
1269 break;
1270 }
1271
1272 return -EINVAL;
1273 }
1274
1275 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1276 {
1277 struct acpi_video_device *dev = seq->private;
1278 int status;
1279 int i;
1280 union acpi_object *edid = NULL;
1281
1282
1283 if (!dev)
1284 goto out;
1285
1286 status = acpi_video_device_EDID(dev, &edid, 128);
1287 if (ACPI_FAILURE(status)) {
1288 status = acpi_video_device_EDID(dev, &edid, 256);
1289 }
1290
1291 if (ACPI_FAILURE(status)) {
1292 goto out;
1293 }
1294
1295 if (edid && edid->type == ACPI_TYPE_BUFFER) {
1296 for (i = 0; i < edid->buffer.length; i++)
1297 seq_putc(seq, edid->buffer.pointer[i]);
1298 }
1299
1300 out:
1301 if (!edid)
1302 seq_printf(seq, "<not supported>\n");
1303 else
1304 kfree(edid);
1305
1306 return 0;
1307 }
1308
1309 static int
1310 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1311 {
1312 return single_open(file, acpi_video_device_EDID_seq_show,
1313 PDE(inode)->data);
1314 }
1315
1316 static int acpi_video_device_add_fs(struct acpi_device *device)
1317 {
1318 struct proc_dir_entry *entry, *device_dir;
1319 struct acpi_video_device *vid_dev;
1320
1321 vid_dev = acpi_driver_data(device);
1322 if (!vid_dev)
1323 return -ENODEV;
1324
1325 device_dir = proc_mkdir(acpi_device_bid(device),
1326 vid_dev->video->dir);
1327 if (!device_dir)
1328 return -ENOMEM;
1329
1330 /* 'info' [R] */
1331 entry = proc_create_data("info", S_IRUGO, device_dir,
1332 &acpi_video_device_info_fops, acpi_driver_data(device));
1333 if (!entry)
1334 goto err_remove_dir;
1335
1336 /* 'state' [R/W] */
1337 entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1338 device_dir,
1339 &acpi_video_device_state_fops,
1340 acpi_driver_data(device));
1341 if (!entry)
1342 goto err_remove_info;
1343
1344 /* 'brightness' [R/W] */
1345 entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1346 device_dir,
1347 &acpi_video_device_brightness_fops,
1348 acpi_driver_data(device));
1349 if (!entry)
1350 goto err_remove_state;
1351
1352 /* 'EDID' [R] */
1353 entry = proc_create_data("EDID", S_IRUGO, device_dir,
1354 &acpi_video_device_EDID_fops,
1355 acpi_driver_data(device));
1356 if (!entry)
1357 goto err_remove_brightness;
1358
1359 acpi_device_dir(device) = device_dir;
1360
1361 return 0;
1362
1363 err_remove_brightness:
1364 remove_proc_entry("brightness", device_dir);
1365 err_remove_state:
1366 remove_proc_entry("state", device_dir);
1367 err_remove_info:
1368 remove_proc_entry("info", device_dir);
1369 err_remove_dir:
1370 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1371 return -ENOMEM;
1372 }
1373
1374 static int acpi_video_device_remove_fs(struct acpi_device *device)
1375 {
1376 struct acpi_video_device *vid_dev;
1377 struct proc_dir_entry *device_dir;
1378
1379 vid_dev = acpi_driver_data(device);
1380 if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1381 return -ENODEV;
1382
1383 device_dir = acpi_device_dir(device);
1384 if (device_dir) {
1385 remove_proc_entry("info", device_dir);
1386 remove_proc_entry("state", device_dir);
1387 remove_proc_entry("brightness", device_dir);
1388 remove_proc_entry("EDID", device_dir);
1389 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1390 acpi_device_dir(device) = NULL;
1391 }
1392
1393 return 0;
1394 }
1395
1396 /* video bus */
1397 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1398 {
1399 struct acpi_video_bus *video = seq->private;
1400
1401
1402 if (!video)
1403 goto end;
1404
1405 seq_printf(seq, "Switching heads: %s\n",
1406 video->flags.multihead ? "yes" : "no");
1407 seq_printf(seq, "Video ROM: %s\n",
1408 video->flags.rom ? "yes" : "no");
1409 seq_printf(seq, "Device to be POSTed on boot: %s\n",
1410 video->flags.post ? "yes" : "no");
1411
1412 end:
1413 return 0;
1414 }
1415
1416 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1417 {
1418 return single_open(file, acpi_video_bus_info_seq_show,
1419 PDE(inode)->data);
1420 }
1421
1422 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1423 {
1424 struct acpi_video_bus *video = seq->private;
1425
1426
1427 if (!video)
1428 goto end;
1429
1430 printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1431 seq_printf(seq, "<TODO>\n");
1432
1433 end:
1434 return 0;
1435 }
1436
1437 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1438 {
1439 return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1440 }
1441
1442 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1443 {
1444 struct acpi_video_bus *video = seq->private;
1445 unsigned long long options;
1446 int status;
1447
1448
1449 if (!video)
1450 goto end;
1451
1452 status = acpi_video_bus_POST_options(video, &options);
1453 if (ACPI_SUCCESS(status)) {
1454 if (!(options & 1)) {
1455 printk(KERN_WARNING PREFIX
1456 "The motherboard VGA device is not listed as a possible POST device.\n");
1457 printk(KERN_WARNING PREFIX
1458 "This indicates a BIOS bug. Please contact the manufacturer.\n");
1459 }
1460 printk(KERN_WARNING "%llx\n", options);
1461 seq_printf(seq, "can POST: <integrated video>");
1462 if (options & 2)
1463 seq_printf(seq, " <PCI video>");
1464 if (options & 4)
1465 seq_printf(seq, " <AGP video>");
1466 seq_putc(seq, '\n');
1467 } else
1468 seq_printf(seq, "<not supported>\n");
1469 end:
1470 return 0;
1471 }
1472
1473 static int
1474 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1475 {
1476 return single_open(file, acpi_video_bus_POST_info_seq_show,
1477 PDE(inode)->data);
1478 }
1479
1480 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1481 {
1482 struct acpi_video_bus *video = seq->private;
1483 int status;
1484 unsigned long long id;
1485
1486
1487 if (!video)
1488 goto end;
1489
1490 status = acpi_video_bus_get_POST(video, &id);
1491 if (!ACPI_SUCCESS(status)) {
1492 seq_printf(seq, "<not supported>\n");
1493 goto end;
1494 }
1495 seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1496
1497 end:
1498 return 0;
1499 }
1500
1501 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1502 {
1503 struct acpi_video_bus *video = seq->private;
1504
1505
1506 seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1507
1508 return 0;
1509 }
1510
1511 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1512 {
1513 return single_open(file, acpi_video_bus_POST_seq_show,
1514 PDE(inode)->data);
1515 }
1516
1517 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1518 {
1519 return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1520 }
1521
1522 static ssize_t
1523 acpi_video_bus_write_POST(struct file *file,
1524 const char __user * buffer,
1525 size_t count, loff_t * data)
1526 {
1527 int status;
1528 struct seq_file *m = file->private_data;
1529 struct acpi_video_bus *video = m->private;
1530 char str[12] = { 0 };
1531 unsigned long long opt, options;
1532
1533
1534 if (!video || count + 1 > sizeof str)
1535 return -EINVAL;
1536
1537 status = acpi_video_bus_POST_options(video, &options);
1538 if (!ACPI_SUCCESS(status))
1539 return -EINVAL;
1540
1541 if (copy_from_user(str, buffer, count))
1542 return -EFAULT;
1543
1544 str[count] = 0;
1545 opt = strtoul(str, NULL, 0);
1546 if (opt > 3)
1547 return -EFAULT;
1548
1549 /* just in case an OEM 'forgot' the motherboard... */
1550 options |= 1;
1551
1552 if (options & (1ul << opt)) {
1553 status = acpi_video_bus_set_POST(video, opt);
1554 if (!ACPI_SUCCESS(status))
1555 return -EFAULT;
1556
1557 }
1558
1559 return count;
1560 }
1561
1562 static ssize_t
1563 acpi_video_bus_write_DOS(struct file *file,
1564 const char __user * buffer,
1565 size_t count, loff_t * data)
1566 {
1567 int status;
1568 struct seq_file *m = file->private_data;
1569 struct acpi_video_bus *video = m->private;
1570 char str[12] = { 0 };
1571 unsigned long opt;
1572
1573
1574 if (!video || count + 1 > sizeof str)
1575 return -EINVAL;
1576
1577 if (copy_from_user(str, buffer, count))
1578 return -EFAULT;
1579
1580 str[count] = 0;
1581 opt = strtoul(str, NULL, 0);
1582 if (opt > 7)
1583 return -EFAULT;
1584
1585 status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1586
1587 if (!ACPI_SUCCESS(status))
1588 return -EFAULT;
1589
1590 return count;
1591 }
1592
1593 static int acpi_video_bus_add_fs(struct acpi_device *device)
1594 {
1595 struct acpi_video_bus *video = acpi_driver_data(device);
1596 struct proc_dir_entry *device_dir;
1597 struct proc_dir_entry *entry;
1598
1599 device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1600 if (!device_dir)
1601 return -ENOMEM;
1602
1603 /* 'info' [R] */
1604 entry = proc_create_data("info", S_IRUGO, device_dir,
1605 &acpi_video_bus_info_fops,
1606 acpi_driver_data(device));
1607 if (!entry)
1608 goto err_remove_dir;
1609
1610 /* 'ROM' [R] */
1611 entry = proc_create_data("ROM", S_IRUGO, device_dir,
1612 &acpi_video_bus_ROM_fops,
1613 acpi_driver_data(device));
1614 if (!entry)
1615 goto err_remove_info;
1616
1617 /* 'POST_info' [R] */
1618 entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1619 &acpi_video_bus_POST_info_fops,
1620 acpi_driver_data(device));
1621 if (!entry)
1622 goto err_remove_rom;
1623
1624 /* 'POST' [R/W] */
1625 entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1626 device_dir,
1627 &acpi_video_bus_POST_fops,
1628 acpi_driver_data(device));
1629 if (!entry)
1630 goto err_remove_post_info;
1631
1632 /* 'DOS' [R/W] */
1633 entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1634 device_dir,
1635 &acpi_video_bus_DOS_fops,
1636 acpi_driver_data(device));
1637 if (!entry)
1638 goto err_remove_post;
1639
1640 video->dir = acpi_device_dir(device) = device_dir;
1641 return 0;
1642
1643 err_remove_post:
1644 remove_proc_entry("POST", device_dir);
1645 err_remove_post_info:
1646 remove_proc_entry("POST_info", device_dir);
1647 err_remove_rom:
1648 remove_proc_entry("ROM", device_dir);
1649 err_remove_info:
1650 remove_proc_entry("info", device_dir);
1651 err_remove_dir:
1652 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1653 return -ENOMEM;
1654 }
1655
1656 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1657 {
1658 struct proc_dir_entry *device_dir = acpi_device_dir(device);
1659
1660 if (device_dir) {
1661 remove_proc_entry("info", device_dir);
1662 remove_proc_entry("ROM", device_dir);
1663 remove_proc_entry("POST_info", device_dir);
1664 remove_proc_entry("POST", device_dir);
1665 remove_proc_entry("DOS", device_dir);
1666 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1667 acpi_device_dir(device) = NULL;
1668 }
1669
1670 return 0;
1671 }
1672
1673 /* --------------------------------------------------------------------------
1674 Driver Interface
1675 -------------------------------------------------------------------------- */
1676
1677 /* device interface */
1678 static struct acpi_video_device_attrib*
1679 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1680 {
1681 struct acpi_video_enumerated_device *ids;
1682 int i;
1683
1684 for (i = 0; i < video->attached_count; i++) {
1685 ids = &video->attached_array[i];
1686 if ((ids->value.int_val & 0xffff) == device_id)
1687 return &ids->value.attrib;
1688 }
1689
1690 return NULL;
1691 }
1692
1693 static int
1694 acpi_video_bus_get_one_device(struct acpi_device *device,
1695 struct acpi_video_bus *video)
1696 {
1697 unsigned long long device_id;
1698 int status;
1699 struct acpi_video_device *data;
1700 struct acpi_video_device_attrib* attribute;
1701
1702 if (!device || !video)
1703 return -EINVAL;
1704
1705 status =
1706 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1707 if (ACPI_SUCCESS(status)) {
1708
1709 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1710 if (!data)
1711 return -ENOMEM;
1712
1713 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1714 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1715 device->driver_data = data;
1716
1717 data->device_id = device_id;
1718 data->video = video;
1719 data->dev = device;
1720
1721 attribute = acpi_video_get_device_attr(video, device_id);
1722
1723 if((attribute != NULL) && attribute->device_id_scheme) {
1724 switch (attribute->display_type) {
1725 case ACPI_VIDEO_DISPLAY_CRT:
1726 data->flags.crt = 1;
1727 break;
1728 case ACPI_VIDEO_DISPLAY_TV:
1729 data->flags.tvout = 1;
1730 break;
1731 case ACPI_VIDEO_DISPLAY_DVI:
1732 data->flags.dvi = 1;
1733 break;
1734 case ACPI_VIDEO_DISPLAY_LCD:
1735 data->flags.lcd = 1;
1736 break;
1737 default:
1738 data->flags.unknown = 1;
1739 break;
1740 }
1741 if(attribute->bios_can_detect)
1742 data->flags.bios = 1;
1743 } else
1744 data->flags.unknown = 1;
1745
1746 acpi_video_device_bind(video, data);
1747 acpi_video_device_find_cap(data);
1748
1749 status = acpi_install_notify_handler(device->handle,
1750 ACPI_DEVICE_NOTIFY,
1751 acpi_video_device_notify,
1752 data);
1753 if (ACPI_FAILURE(status)) {
1754 printk(KERN_ERR PREFIX
1755 "Error installing notify handler\n");
1756 if(data->brightness)
1757 kfree(data->brightness->levels);
1758 kfree(data->brightness);
1759 kfree(data);
1760 return -ENODEV;
1761 }
1762
1763 mutex_lock(&video->device_list_lock);
1764 list_add_tail(&data->entry, &video->video_device_list);
1765 mutex_unlock(&video->device_list_lock);
1766
1767 acpi_video_device_add_fs(device);
1768
1769 return 0;
1770 }
1771
1772 return -ENOENT;
1773 }
1774
1775 /*
1776 * Arg:
1777 * video : video bus device
1778 *
1779 * Return:
1780 * none
1781 *
1782 * Enumerate the video device list of the video bus,
1783 * bind the ids with the corresponding video devices
1784 * under the video bus.
1785 */
1786
1787 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1788 {
1789 struct acpi_video_device *dev;
1790
1791 mutex_lock(&video->device_list_lock);
1792
1793 list_for_each_entry(dev, &video->video_device_list, entry)
1794 acpi_video_device_bind(video, dev);
1795
1796 mutex_unlock(&video->device_list_lock);
1797 }
1798
1799 /*
1800 * Arg:
1801 * video : video bus device
1802 * device : video output device under the video
1803 * bus
1804 *
1805 * Return:
1806 * none
1807 *
1808 * Bind the ids with the corresponding video devices
1809 * under the video bus.
1810 */
1811
1812 static void
1813 acpi_video_device_bind(struct acpi_video_bus *video,
1814 struct acpi_video_device *device)
1815 {
1816 struct acpi_video_enumerated_device *ids;
1817 int i;
1818
1819 for (i = 0; i < video->attached_count; i++) {
1820 ids = &video->attached_array[i];
1821 if (device->device_id == (ids->value.int_val & 0xffff)) {
1822 ids->bind_info = device;
1823 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1824 }
1825 }
1826 }
1827
1828 /*
1829 * Arg:
1830 * video : video bus device
1831 *
1832 * Return:
1833 * < 0 : error
1834 *
1835 * Call _DOD to enumerate all devices attached to display adapter
1836 *
1837 */
1838
1839 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1840 {
1841 int status;
1842 int count;
1843 int i;
1844 struct acpi_video_enumerated_device *active_list;
1845 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1846 union acpi_object *dod = NULL;
1847 union acpi_object *obj;
1848
1849 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1850 if (!ACPI_SUCCESS(status)) {
1851 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1852 return status;
1853 }
1854
1855 dod = buffer.pointer;
1856 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1857 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1858 status = -EFAULT;
1859 goto out;
1860 }
1861
1862 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1863 dod->package.count));
1864
1865 active_list = kcalloc(1 + dod->package.count,
1866 sizeof(struct acpi_video_enumerated_device),
1867 GFP_KERNEL);
1868 if (!active_list) {
1869 status = -ENOMEM;
1870 goto out;
1871 }
1872
1873 count = 0;
1874 for (i = 0; i < dod->package.count; i++) {
1875 obj = &dod->package.elements[i];
1876
1877 if (obj->type != ACPI_TYPE_INTEGER) {
1878 printk(KERN_ERR PREFIX
1879 "Invalid _DOD data in element %d\n", i);
1880 continue;
1881 }
1882
1883 active_list[count].value.int_val = obj->integer.value;
1884 active_list[count].bind_info = NULL;
1885 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1886 (int)obj->integer.value));
1887 count++;
1888 }
1889
1890 kfree(video->attached_array);
1891
1892 video->attached_array = active_list;
1893 video->attached_count = count;
1894
1895 out:
1896 kfree(buffer.pointer);
1897 return status;
1898 }
1899
1900 static int
1901 acpi_video_get_next_level(struct acpi_video_device *device,
1902 u32 level_current, u32 event)
1903 {
1904 int min, max, min_above, max_below, i, l, delta = 255;
1905 max = max_below = 0;
1906 min = min_above = 255;
1907 /* Find closest level to level_current */
1908 for (i = 2; i < device->brightness->count; i++) {
1909 l = device->brightness->levels[i];
1910 if (abs(l - level_current) < abs(delta)) {
1911 delta = l - level_current;
1912 if (!delta)
1913 break;
1914 }
1915 }
1916 /* Ajust level_current to closest available level */
1917 level_current += delta;
1918 for (i = 2; i < device->brightness->count; i++) {
1919 l = device->brightness->levels[i];
1920 if (l < min)
1921 min = l;
1922 if (l > max)
1923 max = l;
1924 if (l < min_above && l > level_current)
1925 min_above = l;
1926 if (l > max_below && l < level_current)
1927 max_below = l;
1928 }
1929
1930 switch (event) {
1931 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1932 return (level_current < max) ? min_above : min;
1933 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1934 return (level_current < max) ? min_above : max;
1935 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1936 return (level_current > min) ? max_below : min;
1937 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1938 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1939 return 0;
1940 default:
1941 return level_current;
1942 }
1943 }
1944
1945 static int
1946 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1947 {
1948 unsigned long long level_current, level_next;
1949 int result = -EINVAL;
1950
1951 if (!device->brightness)
1952 goto out;
1953
1954 result = acpi_video_device_lcd_get_level_current(device,
1955 &level_current);
1956 if (result)
1957 goto out;
1958
1959 level_next = acpi_video_get_next_level(device, level_current, event);
1960
1961 result = acpi_video_device_lcd_set_level(device, level_next);
1962
1963 out:
1964 if (result)
1965 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1966
1967 return result;
1968 }
1969
1970 static int
1971 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1972 struct acpi_device *device)
1973 {
1974 int status = 0;
1975 struct acpi_device *dev;
1976
1977 acpi_video_device_enumerate(video);
1978
1979 list_for_each_entry(dev, &device->children, node) {
1980
1981 status = acpi_video_bus_get_one_device(dev, video);
1982 if (ACPI_FAILURE(status)) {
1983 printk(KERN_WARNING PREFIX
1984 "Cant attach device");
1985 continue;
1986 }
1987 }
1988 return status;
1989 }
1990
1991 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1992 {
1993 acpi_status status;
1994 struct acpi_video_bus *video;
1995
1996
1997 if (!device || !device->video)
1998 return -ENOENT;
1999
2000 video = device->video;
2001
2002 acpi_video_device_remove_fs(device->dev);
2003
2004 status = acpi_remove_notify_handler(device->dev->handle,
2005 ACPI_DEVICE_NOTIFY,
2006 acpi_video_device_notify);
2007 sysfs_remove_link(&device->backlight->dev.kobj, "device");
2008 backlight_device_unregister(device->backlight);
2009 if (device->cdev) {
2010 sysfs_remove_link(&device->dev->dev.kobj,
2011 "thermal_cooling");
2012 sysfs_remove_link(&device->cdev->device.kobj,
2013 "device");
2014 thermal_cooling_device_unregister(device->cdev);
2015 device->cdev = NULL;
2016 }
2017 video_output_unregister(device->output_dev);
2018
2019 return 0;
2020 }
2021
2022 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2023 {
2024 int status;
2025 struct acpi_video_device *dev, *next;
2026
2027 mutex_lock(&video->device_list_lock);
2028
2029 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2030
2031 status = acpi_video_bus_put_one_device(dev);
2032 if (ACPI_FAILURE(status))
2033 printk(KERN_WARNING PREFIX
2034 "hhuuhhuu bug in acpi video driver.\n");
2035
2036 if (dev->brightness) {
2037 kfree(dev->brightness->levels);
2038 kfree(dev->brightness);
2039 }
2040 list_del(&dev->entry);
2041 kfree(dev);
2042 }
2043
2044 mutex_unlock(&video->device_list_lock);
2045
2046 return 0;
2047 }
2048
2049 /* acpi_video interface */
2050
2051 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
2052 {
2053 return acpi_video_bus_DOS(video, 0, 0);
2054 }
2055
2056 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
2057 {
2058 return acpi_video_bus_DOS(video, 0, 1);
2059 }
2060
2061 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
2062 {
2063 struct acpi_video_bus *video = acpi_driver_data(device);
2064 struct input_dev *input;
2065 int keycode;
2066
2067 if (!video)
2068 return;
2069
2070 input = video->input;
2071
2072 switch (event) {
2073 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
2074 * most likely via hotkey. */
2075 acpi_bus_generate_proc_event(device, event, 0);
2076 keycode = KEY_SWITCHVIDEOMODE;
2077 break;
2078
2079 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
2080 * connector. */
2081 acpi_video_device_enumerate(video);
2082 acpi_video_device_rebind(video);
2083 acpi_bus_generate_proc_event(device, event, 0);
2084 keycode = KEY_SWITCHVIDEOMODE;
2085 break;
2086
2087 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
2088 acpi_bus_generate_proc_event(device, event, 0);
2089 keycode = KEY_SWITCHVIDEOMODE;
2090 break;
2091 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
2092 acpi_bus_generate_proc_event(device, event, 0);
2093 keycode = KEY_VIDEO_NEXT;
2094 break;
2095 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
2096 acpi_bus_generate_proc_event(device, event, 0);
2097 keycode = KEY_VIDEO_PREV;
2098 break;
2099
2100 default:
2101 keycode = KEY_UNKNOWN;
2102 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2103 "Unsupported event [0x%x]\n", event));
2104 break;
2105 }
2106
2107 acpi_notifier_call_chain(device, event, 0);
2108 input_report_key(input, keycode, 1);
2109 input_sync(input);
2110 input_report_key(input, keycode, 0);
2111 input_sync(input);
2112
2113 return;
2114 }
2115
2116 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
2117 {
2118 struct acpi_video_device *video_device = data;
2119 struct acpi_device *device = NULL;
2120 struct acpi_video_bus *bus;
2121 struct input_dev *input;
2122 int keycode;
2123
2124 if (!video_device)
2125 return;
2126
2127 device = video_device->dev;
2128 bus = video_device->video;
2129 input = bus->input;
2130
2131 switch (event) {
2132 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
2133 if (brightness_switch_enabled)
2134 acpi_video_switch_brightness(video_device, event);
2135 acpi_bus_generate_proc_event(device, event, 0);
2136 keycode = KEY_BRIGHTNESS_CYCLE;
2137 break;
2138 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
2139 if (brightness_switch_enabled)
2140 acpi_video_switch_brightness(video_device, event);
2141 acpi_bus_generate_proc_event(device, event, 0);
2142 keycode = KEY_BRIGHTNESSUP;
2143 break;
2144 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
2145 if (brightness_switch_enabled)
2146 acpi_video_switch_brightness(video_device, event);
2147 acpi_bus_generate_proc_event(device, event, 0);
2148 keycode = KEY_BRIGHTNESSDOWN;
2149 break;
2150 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
2151 if (brightness_switch_enabled)
2152 acpi_video_switch_brightness(video_device, event);
2153 acpi_bus_generate_proc_event(device, event, 0);
2154 keycode = KEY_BRIGHTNESS_ZERO;
2155 break;
2156 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
2157 if (brightness_switch_enabled)
2158 acpi_video_switch_brightness(video_device, event);
2159 acpi_bus_generate_proc_event(device, event, 0);
2160 keycode = KEY_DISPLAY_OFF;
2161 break;
2162 default:
2163 keycode = KEY_UNKNOWN;
2164 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2165 "Unsupported event [0x%x]\n", event));
2166 break;
2167 }
2168
2169 acpi_notifier_call_chain(device, event, 0);
2170 input_report_key(input, keycode, 1);
2171 input_sync(input);
2172 input_report_key(input, keycode, 0);
2173 input_sync(input);
2174
2175 return;
2176 }
2177
2178 static int instance;
2179 static int acpi_video_resume(struct acpi_device *device)
2180 {
2181 struct acpi_video_bus *video;
2182 struct acpi_video_device *video_device;
2183 int i;
2184
2185 if (!device || !acpi_driver_data(device))
2186 return -EINVAL;
2187
2188 video = acpi_driver_data(device);
2189
2190 for (i = 0; i < video->attached_count; i++) {
2191 video_device = video->attached_array[i].bind_info;
2192 if (video_device && video_device->backlight)
2193 acpi_video_set_brightness(video_device->backlight);
2194 }
2195 return AE_OK;
2196 }
2197
2198 static int acpi_video_bus_add(struct acpi_device *device)
2199 {
2200 struct acpi_video_bus *video;
2201 struct input_dev *input;
2202 int error;
2203
2204 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2205 if (!video)
2206 return -ENOMEM;
2207
2208 /* a hack to fix the duplicate name "VID" problem on T61 */
2209 if (!strcmp(device->pnp.bus_id, "VID")) {
2210 if (instance)
2211 device->pnp.bus_id[3] = '0' + instance;
2212 instance ++;
2213 }
2214 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2215 if (!strcmp(device->pnp.bus_id, "VGA")) {
2216 if (instance)
2217 device->pnp.bus_id[3] = '0' + instance;
2218 instance++;
2219 }
2220
2221 video->device = device;
2222 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2223 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2224 device->driver_data = video;
2225
2226 acpi_video_bus_find_cap(video);
2227 error = acpi_video_bus_check(video);
2228 if (error)
2229 goto err_free_video;
2230
2231 error = acpi_video_bus_add_fs(device);
2232 if (error)
2233 goto err_free_video;
2234
2235 mutex_init(&video->device_list_lock);
2236 INIT_LIST_HEAD(&video->video_device_list);
2237
2238 acpi_video_bus_get_devices(video, device);
2239 acpi_video_bus_start_devices(video);
2240
2241 video->input = input = input_allocate_device();
2242 if (!input) {
2243 error = -ENOMEM;
2244 goto err_stop_video;
2245 }
2246
2247 snprintf(video->phys, sizeof(video->phys),
2248 "%s/video/input0", acpi_device_hid(video->device));
2249
2250 input->name = acpi_device_name(video->device);
2251 input->phys = video->phys;
2252 input->id.bustype = BUS_HOST;
2253 input->id.product = 0x06;
2254 input->dev.parent = &device->dev;
2255 input->evbit[0] = BIT(EV_KEY);
2256 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2257 set_bit(KEY_VIDEO_NEXT, input->keybit);
2258 set_bit(KEY_VIDEO_PREV, input->keybit);
2259 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2260 set_bit(KEY_BRIGHTNESSUP, input->keybit);
2261 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2262 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2263 set_bit(KEY_DISPLAY_OFF, input->keybit);
2264 set_bit(KEY_UNKNOWN, input->keybit);
2265
2266 error = input_register_device(input);
2267 if (error)
2268 goto err_free_input_dev;
2269
2270 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
2271 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2272 video->flags.multihead ? "yes" : "no",
2273 video->flags.rom ? "yes" : "no",
2274 video->flags.post ? "yes" : "no");
2275
2276 return 0;
2277
2278 err_free_input_dev:
2279 input_free_device(input);
2280 err_stop_video:
2281 acpi_video_bus_stop_devices(video);
2282 acpi_video_bus_put_devices(video);
2283 kfree(video->attached_array);
2284 acpi_video_bus_remove_fs(device);
2285 err_free_video:
2286 kfree(video);
2287 device->driver_data = NULL;
2288
2289 return error;
2290 }
2291
2292 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2293 {
2294 struct acpi_video_bus *video = NULL;
2295
2296
2297 if (!device || !acpi_driver_data(device))
2298 return -EINVAL;
2299
2300 video = acpi_driver_data(device);
2301
2302 acpi_video_bus_stop_devices(video);
2303 acpi_video_bus_put_devices(video);
2304 acpi_video_bus_remove_fs(device);
2305
2306 input_unregister_device(video->input);
2307 kfree(video->attached_array);
2308 kfree(video);
2309
2310 return 0;
2311 }
2312
2313 static int __init intel_opregion_present(void)
2314 {
2315 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
2316 struct pci_dev *dev = NULL;
2317 u32 address;
2318
2319 for_each_pci_dev(dev) {
2320 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2321 continue;
2322 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2323 continue;
2324 pci_read_config_dword(dev, 0xfc, &address);
2325 if (!address)
2326 continue;
2327 return 1;
2328 }
2329 #endif
2330 return 0;
2331 }
2332
2333 int acpi_video_register(void)
2334 {
2335 int result = 0;
2336 if (register_count) {
2337 /*
2338 * if the function of acpi_video_register is already called,
2339 * don't register the acpi_vide_bus again and return no error.
2340 */
2341 return 0;
2342 }
2343
2344 acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2345 if (!acpi_video_dir)
2346 return -ENODEV;
2347
2348 result = acpi_bus_register_driver(&acpi_video_bus);
2349 if (result < 0) {
2350 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2351 return -ENODEV;
2352 }
2353
2354 /*
2355 * When the acpi_video_bus is loaded successfully, increase
2356 * the counter reference.
2357 */
2358 register_count = 1;
2359
2360 return 0;
2361 }
2362 EXPORT_SYMBOL(acpi_video_register);
2363
2364 void acpi_video_unregister(void)
2365 {
2366 if (!register_count) {
2367 /*
2368 * If the acpi video bus is already unloaded, don't
2369 * unload it again and return directly.
2370 */
2371 return;
2372 }
2373 acpi_bus_unregister_driver(&acpi_video_bus);
2374
2375 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2376
2377 register_count = 0;
2378
2379 return;
2380 }
2381 EXPORT_SYMBOL(acpi_video_unregister);
2382
2383 /*
2384 * This is kind of nasty. Hardware using Intel chipsets may require
2385 * the video opregion code to be run first in order to initialise
2386 * state before any ACPI video calls are made. To handle this we defer
2387 * registration of the video class until the opregion code has run.
2388 */
2389
2390 static int __init acpi_video_init(void)
2391 {
2392 dmi_check_system(video_dmi_table);
2393
2394 if (intel_opregion_present())
2395 return 0;
2396
2397 return acpi_video_register();
2398 }
2399
2400 static void __exit acpi_video_exit(void)
2401 {
2402 acpi_video_unregister();
2403
2404 return;
2405 }
2406
2407 module_init(acpi_video_init);
2408 module_exit(acpi_video_exit);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree