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/input.h>
34 #include <linux/backlight.h>
35 #include <linux/thermal.h>
36 #include <linux/sort.h>
37 #include <linux/pci.h>
38 #include <linux/pci_ids.h>
39 #include <linux/slab.h>
40 #include <asm/uaccess.h>
41 #include <linux/dmi.h>
42 #include <acpi/acpi_bus.h>
43 #include <acpi/acpi_drivers.h>
44 #include <linux/suspend.h>
45 #include <acpi/video.h>
46
47 #define PREFIX "ACPI: "
48
49 #define ACPI_VIDEO_BUS_NAME "Video Bus"
50 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
51 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
52 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
53 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
54 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
55 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
56
57 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
58 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
59 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
60 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
61 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
62
63 #define MAX_NAME_LEN 20
64
65 #define _COMPONENT ACPI_VIDEO_COMPONENT
66 ACPI_MODULE_NAME("video");
67
68 MODULE_AUTHOR("Bruno Ducrot");
69 MODULE_DESCRIPTION("ACPI Video Driver");
70 MODULE_LICENSE("GPL");
71
72 static bool brightness_switch_enabled = 1;
73 module_param(brightness_switch_enabled, bool, 0644);
74
75 /*
76 * By default, we don't allow duplicate ACPI video bus devices
77 * under the same VGA controller
78 */
79 static bool allow_duplicates;
80 module_param(allow_duplicates, bool, 0644);
81
82 /*
83 * Some BIOSes claim they use minimum backlight at boot,
84 * and this may bring dimming screen after boot
85 */
86 static bool use_bios_initial_backlight = 1;
87 module_param(use_bios_initial_backlight, bool, 0644);
88
89 static int register_count = 0;
90 static int acpi_video_bus_add(struct acpi_device *device);
91 static int acpi_video_bus_remove(struct acpi_device *device);
92 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
93
94 static const struct acpi_device_id video_device_ids[] = {
95 {ACPI_VIDEO_HID, 0},
96 {"", 0},
97 };
98 MODULE_DEVICE_TABLE(acpi, video_device_ids);
99
100 static struct acpi_driver acpi_video_bus = {
101 .name = "video",
102 .class = ACPI_VIDEO_CLASS,
103 .ids = video_device_ids,
104 .ops = {
105 .add = acpi_video_bus_add,
106 .remove = acpi_video_bus_remove,
107 .notify = acpi_video_bus_notify,
108 },
109 };
110
111 struct acpi_video_bus_flags {
112 u8 multihead:1; /* can switch video heads */
113 u8 rom:1; /* can retrieve a video rom */
114 u8 post:1; /* can configure the head to */
115 u8 reserved:5;
116 };
117
118 struct acpi_video_bus_cap {
119 u8 _DOS:1; /*Enable/Disable output switching */
120 u8 _DOD:1; /*Enumerate all devices attached to display adapter */
121 u8 _ROM:1; /*Get ROM Data */
122 u8 _GPD:1; /*Get POST Device */
123 u8 _SPD:1; /*Set POST Device */
124 u8 _VPO:1; /*Video POST Options */
125 u8 reserved:2;
126 };
127
128 struct acpi_video_device_attrib {
129 u32 display_index:4; /* A zero-based instance of the Display */
130 u32 display_port_attachment:4; /*This field differentiates the display type */
131 u32 display_type:4; /*Describe the specific type in use */
132 u32 vendor_specific:4; /*Chipset Vendor Specific */
133 u32 bios_can_detect:1; /*BIOS can detect the device */
134 u32 depend_on_vga:1; /*Non-VGA output device whose power is related to
135 the VGA device. */
136 u32 pipe_id:3; /*For VGA multiple-head devices. */
137 u32 reserved:10; /*Must be 0 */
138 u32 device_id_scheme:1; /*Device ID Scheme */
139 };
140
141 struct acpi_video_enumerated_device {
142 union {
143 u32 int_val;
144 struct acpi_video_device_attrib attrib;
145 } value;
146 struct acpi_video_device *bind_info;
147 };
148
149 struct acpi_video_bus {
150 struct acpi_device *device;
151 u8 dos_setting;
152 struct acpi_video_enumerated_device *attached_array;
153 u8 attached_count;
154 struct acpi_video_bus_cap cap;
155 struct acpi_video_bus_flags flags;
156 struct list_head video_device_list;
157 struct mutex device_list_lock; /* protects video_device_list */
158 struct input_dev *input;
159 char phys[32]; /* for input device */
160 struct notifier_block pm_nb;
161 };
162
163 struct acpi_video_device_flags {
164 u8 crt:1;
165 u8 lcd:1;
166 u8 tvout:1;
167 u8 dvi:1;
168 u8 bios:1;
169 u8 unknown:1;
170 u8 notify:1;
171 u8 reserved:1;
172 };
173
174 struct acpi_video_device_cap {
175 u8 _ADR:1; /*Return the unique ID */
176 u8 _BCL:1; /*Query list of brightness control levels supported */
177 u8 _BCM:1; /*Set the brightness level */
178 u8 _BQC:1; /* Get current brightness level */
179 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
180 u8 _DDC:1; /*Return the EDID for this device */
181 };
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 };
209
210 static const char device_decode[][30] = {
211 "motherboard VGA device",
212 "PCI VGA device",
213 "AGP VGA device",
214 "UNKNOWN",
215 };
216
217 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
218 static void acpi_video_device_rebind(struct acpi_video_bus *video);
219 static void acpi_video_device_bind(struct acpi_video_bus *video,
220 struct acpi_video_device *device);
221 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
222 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
223 int level);
224 static int acpi_video_device_lcd_get_level_current(
225 struct acpi_video_device *device,
226 unsigned long long *level, bool raw);
227 static int acpi_video_get_next_level(struct acpi_video_device *device,
228 u32 level_current, u32 event);
229 static int acpi_video_switch_brightness(struct acpi_video_device *device,
230 int event);
231
232 /*backlight device sysfs support*/
acpi_video_get_brightness(struct backlight_device * bd)233 static int acpi_video_get_brightness(struct backlight_device *bd)
234 {
235 unsigned long long cur_level;
236 int i;
237 struct acpi_video_device *vd =
238 (struct acpi_video_device *)bl_get_data(bd);
239
240 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
241 return -EINVAL;
242 for (i = 2; i < vd->brightness->count; i++) {
243 if (vd->brightness->levels[i] == cur_level)
244 /* The first two entries are special - see page 575
245 of the ACPI spec 3.0 */
246 return i-2;
247 }
248 return 0;
249 }
250
acpi_video_set_brightness(struct backlight_device * bd)251 static int acpi_video_set_brightness(struct backlight_device *bd)
252 {
253 int request_level = bd->props.brightness + 2;
254 struct acpi_video_device *vd =
255 (struct acpi_video_device *)bl_get_data(bd);
256
257 return acpi_video_device_lcd_set_level(vd,
258 vd->brightness->levels[request_level]);
259 }
260
261 static const struct backlight_ops acpi_backlight_ops = {
262 .get_brightness = acpi_video_get_brightness,
263 .update_status = acpi_video_set_brightness,
264 };
265
266 /* thermal cooling device callbacks */
video_get_max_state(struct thermal_cooling_device * cooling_dev,unsigned long * state)267 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
268 long *state)
269 {
270 struct acpi_device *device = cooling_dev->devdata;
271 struct acpi_video_device *video = acpi_driver_data(device);
272
273 *state = video->brightness->count - 3;
274 return 0;
275 }
276
video_get_cur_state(struct thermal_cooling_device * cooling_dev,unsigned long * state)277 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
278 long *state)
279 {
280 struct acpi_device *device = cooling_dev->devdata;
281 struct acpi_video_device *video = acpi_driver_data(device);
282 unsigned long long level;
283 int offset;
284
285 if (acpi_video_device_lcd_get_level_current(video, &level, false))
286 return -EINVAL;
287 for (offset = 2; offset < video->brightness->count; offset++)
288 if (level == video->brightness->levels[offset]) {
289 *state = video->brightness->count - offset - 1;
290 return 0;
291 }
292
293 return -EINVAL;
294 }
295
296 static int
video_set_cur_state(struct thermal_cooling_device * cooling_dev,unsigned long state)297 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
298 {
299 struct acpi_device *device = cooling_dev->devdata;
300 struct acpi_video_device *video = acpi_driver_data(device);
301 int level;
302
303 if ( state >= video->brightness->count - 2)
304 return -EINVAL;
305
306 state = video->brightness->count - state;
307 level = video->brightness->levels[state -1];
308 return acpi_video_device_lcd_set_level(video, level);
309 }
310
311 static const struct thermal_cooling_device_ops video_cooling_ops = {
312 .get_max_state = video_get_max_state,
313 .get_cur_state = video_get_cur_state,
314 .set_cur_state = video_set_cur_state,
315 };
316
317 /* --------------------------------------------------------------------------
318 Video Management
319 -------------------------------------------------------------------------- */
320
321 static int
acpi_video_device_lcd_query_levels(struct acpi_video_device * device,union acpi_object ** levels)322 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
323 union acpi_object **levels)
324 {
325 int status;
326 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
327 union acpi_object *obj;
328
329
330 *levels = NULL;
331
332 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
333 if (!ACPI_SUCCESS(status))
334 return status;
335 obj = (union acpi_object *)buffer.pointer;
336 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
337 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
338 status = -EFAULT;
339 goto err;
340 }
341
342 *levels = obj;
343
344 return 0;
345
346 err:
347 kfree(buffer.pointer);
348
349 return status;
350 }
351
352 static int
acpi_video_device_lcd_set_level(struct acpi_video_device * device,int level)353 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
354 {
355 int status;
356 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
357 struct acpi_object_list args = { 1, &arg0 };
358 int state;
359
360 arg0.integer.value = level;
361
362 status = acpi_evaluate_object(device->dev->handle, "_BCM",
363 &args, NULL);
364 if (ACPI_FAILURE(status)) {
365 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
366 return -EIO;
367 }
368
369 device->brightness->curr = level;
370 for (state = 2; state < device->brightness->count; state++)
371 if (level == device->brightness->levels[state]) {
372 if (device->backlight)
373 device->backlight->props.brightness = state - 2;
374 return 0;
375 }
376
377 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
378 return -EINVAL;
379 }
380
381 /*
382 * For some buggy _BQC methods, we need to add a constant value to
383 * the _BQC return value to get the actual current brightness level
384 */
385
386 static int bqc_offset_aml_bug_workaround;
video_set_bqc_offset(const struct dmi_system_id * d)387 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
388 {
389 bqc_offset_aml_bug_workaround = 9;
390 return 0;
391 }
392
video_ignore_initial_backlight(const struct dmi_system_id * d)393 static int video_ignore_initial_backlight(const struct dmi_system_id *d)
394 {
395 use_bios_initial_backlight = 0;
396 return 0;
397 }
398
399 static struct dmi_system_id video_dmi_table[] __initdata = {
400 /*
401 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
402 */
403 {
404 .callback = video_set_bqc_offset,
405 .ident = "Acer Aspire 5720",
406 .matches = {
407 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
408 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
409 },
410 },
411 {
412 .callback = video_set_bqc_offset,
413 .ident = "Acer Aspire 5710Z",
414 .matches = {
415 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
416 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
417 },
418 },
419 {
420 .callback = video_set_bqc_offset,
421 .ident = "eMachines E510",
422 .matches = {
423 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
424 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
425 },
426 },
427 {
428 .callback = video_set_bqc_offset,
429 .ident = "Acer Aspire 5315",
430 .matches = {
431 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
432 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
433 },
434 },
435 {
436 .callback = video_set_bqc_offset,
437 .ident = "Acer Aspire 7720",
438 .matches = {
439 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
440 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
441 },
442 },
443 {
444 .callback = video_ignore_initial_backlight,
445 .ident = "HP Folio 13-2000",
446 .matches = {
447 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
448 DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13 - 2000 Notebook PC"),
449 },
450 },
451 {
452 .callback = video_ignore_initial_backlight,
453 .ident = "HP Pavilion dm4",
454 .matches = {
455 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
456 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dm4 Notebook PC"),
457 },
458 },
459 {
460 .callback = video_ignore_initial_backlight,
461 .ident = "HP Pavilion g6 Notebook PC",
462 .matches = {
463 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
464 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion g6 Notebook PC"),
465 },
466 },
467 {
468 .callback = video_ignore_initial_backlight,
469 .ident = "HP 1000 Notebook PC",
470 .matches = {
471 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
472 DMI_MATCH(DMI_PRODUCT_NAME, "HP 1000 Notebook PC"),
473 },
474 },
475 {
476 .callback = video_ignore_initial_backlight,
477 .ident = "HP Pavilion m4",
478 .matches = {
479 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
480 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion m4 Notebook PC"),
481 },
482 },
483 {}
484 };
485
486 static unsigned long long
acpi_video_bqc_value_to_level(struct acpi_video_device * device,unsigned long long bqc_value)487 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
488 unsigned long long bqc_value)
489 {
490 unsigned long long level;
491
492 if (device->brightness->flags._BQC_use_index) {
493 /*
494 * _BQC returns an index that doesn't account for
495 * the first 2 items with special meaning, so we need
496 * to compensate for that by offsetting ourselves
497 */
498 if (device->brightness->flags._BCL_reversed)
499 bqc_value = device->brightness->count - 3 - bqc_value;
500
501 level = device->brightness->levels[bqc_value + 2];
502 } else {
503 level = bqc_value;
504 }
505
506 level += bqc_offset_aml_bug_workaround;
507
508 return level;
509 }
510
511 static int
acpi_video_device_lcd_get_level_current(struct acpi_video_device * device,unsigned long long * level,bool raw)512 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
513 unsigned long long *level, bool raw)
514 {
515 acpi_status status = AE_OK;
516 int i;
517
518 if (device->cap._BQC || device->cap._BCQ) {
519 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
520
521 status = acpi_evaluate_integer(device->dev->handle, buf,
522 NULL, level);
523 if (ACPI_SUCCESS(status)) {
524 if (raw) {
525 /*
526 * Caller has indicated he wants the raw
527 * value returned by _BQC, so don't furtherly
528 * mess with the value.
529 */
530 return 0;
531 }
532
533 *level = acpi_video_bqc_value_to_level(device, *level);
534
535 for (i = 2; i < device->brightness->count; i++)
536 if (device->brightness->levels[i] == *level) {
537 device->brightness->curr = *level;
538 return 0;
539 }
540 /*
541 * BQC returned an invalid level.
542 * Stop using it.
543 */
544 ACPI_WARNING((AE_INFO,
545 "%s returned an invalid level",
546 buf));
547 device->cap._BQC = device->cap._BCQ = 0;
548 } else {
549 /* Fixme:
550 * should we return an error or ignore this failure?
551 * dev->brightness->curr is a cached value which stores
552 * the correct current backlight level in most cases.
553 * ACPI video backlight still works w/ buggy _BQC.
554 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
555 */
556 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
557 device->cap._BQC = device->cap._BCQ = 0;
558 }
559 }
560
561 *level = device->brightness->curr;
562 return 0;
563 }
564
565 static int
acpi_video_device_EDID(struct acpi_video_device * device,union acpi_object ** edid,ssize_t length)566 acpi_video_device_EDID(struct acpi_video_device *device,
567 union acpi_object **edid, ssize_t length)
568 {
569 int status;
570 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
571 union acpi_object *obj;
572 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
573 struct acpi_object_list args = { 1, &arg0 };
574
575
576 *edid = NULL;
577
578 if (!device)
579 return -ENODEV;
580 if (length == 128)
581 arg0.integer.value = 1;
582 else if (length == 256)
583 arg0.integer.value = 2;
584 else
585 return -EINVAL;
586
587 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
588 if (ACPI_FAILURE(status))
589 return -ENODEV;
590
591 obj = buffer.pointer;
592
593 if (obj && obj->type == ACPI_TYPE_BUFFER)
594 *edid = obj;
595 else {
596 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
597 status = -EFAULT;
598 kfree(obj);
599 }
600
601 return status;
602 }
603
604 /* bus */
605
606 /*
607 * Arg:
608 * video : video bus device pointer
609 * bios_flag :
610 * 0. The system BIOS should NOT automatically switch(toggle)
611 * the active display output.
612 * 1. The system BIOS should automatically switch (toggle) the
613 * active display output. No switch event.
614 * 2. The _DGS value should be locked.
615 * 3. The system BIOS should not automatically switch (toggle) the
616 * active display output, but instead generate the display switch
617 * event notify code.
618 * lcd_flag :
619 * 0. The system BIOS should automatically control the brightness level
620 * of the LCD when the power changes from AC to DC
621 * 1. The system BIOS should NOT automatically control the brightness
622 * level of the LCD when the power changes from AC to DC.
623 * Return Value:
624 * -EINVAL wrong arg.
625 */
626
627 static int
acpi_video_bus_DOS(struct acpi_video_bus * video,int bios_flag,int lcd_flag)628 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
629 {
630 acpi_status status;
631 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
632 struct acpi_object_list args = { 1, &arg0 };
633
634 if (!video->cap._DOS)
635 return 0;
636
637 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
638 return -EINVAL;
639 arg0.integer.value = (lcd_flag << 2) | bios_flag;
640 video->dos_setting = arg0.integer.value;
641 status = acpi_evaluate_object(video->device->handle, "_DOS",
642 &args, NULL);
643 if (ACPI_FAILURE(status))
644 return -EIO;
645
646 return 0;
647 }
648
649 /*
650 * Simple comparison function used to sort backlight levels.
651 */
652
653 static int
acpi_video_cmp_level(const void * a,const void * b)654 acpi_video_cmp_level(const void *a, const void *b)
655 {
656 return *(int *)a - *(int *)b;
657 }
658
659 /*
660 * Decides if _BQC/_BCQ for this system is usable
661 *
662 * We do this by changing the level first and then read out the current
663 * brightness level, if the value does not match, find out if it is using
664 * index. If not, clear the _BQC/_BCQ capability.
665 */
acpi_video_bqc_quirk(struct acpi_video_device * device,int max_level,int current_level)666 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
667 int max_level, int current_level)
668 {
669 struct acpi_video_device_brightness *br = device->brightness;
670 int result;
671 unsigned long long level;
672 int test_level;
673
674 /* don't mess with existing known broken systems */
675 if (bqc_offset_aml_bug_workaround)
676 return 0;
677
678 /*
679 * Some systems always report current brightness level as maximum
680 * through _BQC, we need to test another value for them.
681 */
682 test_level = current_level == max_level ? br->levels[2] : max_level;
683
684 result = acpi_video_device_lcd_set_level(device, test_level);
685 if (result)
686 return result;
687
688 result = acpi_video_device_lcd_get_level_current(device, &level, true);
689 if (result)
690 return result;
691
692 if (level != test_level) {
693 /* buggy _BQC found, need to find out if it uses index */
694 if (level < br->count) {
695 if (br->flags._BCL_reversed)
696 level = br->count - 3 - level;
697 if (br->levels[level + 2] == test_level)
698 br->flags._BQC_use_index = 1;
699 }
700
701 if (!br->flags._BQC_use_index)
702 device->cap._BQC = device->cap._BCQ = 0;
703 }
704
705 return 0;
706 }
707
708
709 /*
710 * Arg:
711 * device : video output device (LCD, CRT, ..)
712 *
713 * Return Value:
714 * Maximum brightness level
715 *
716 * Allocate and initialize device->brightness.
717 */
718
719 static int
acpi_video_init_brightness(struct acpi_video_device * device)720 acpi_video_init_brightness(struct acpi_video_device *device)
721 {
722 union acpi_object *obj = NULL;
723 int i, max_level = 0, count = 0, level_ac_battery = 0;
724 unsigned long long level, level_old;
725 union acpi_object *o;
726 struct acpi_video_device_brightness *br = NULL;
727 int result = -EINVAL;
728
729 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
730 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
731 "LCD brightness level\n"));
732 goto out;
733 }
734
735 if (obj->package.count < 2)
736 goto out;
737
738 br = kzalloc(sizeof(*br), GFP_KERNEL);
739 if (!br) {
740 printk(KERN_ERR "can't allocate memory\n");
741 result = -ENOMEM;
742 goto out;
743 }
744
745 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
746 GFP_KERNEL);
747 if (!br->levels) {
748 result = -ENOMEM;
749 goto out_free;
750 }
751
752 for (i = 0; i < obj->package.count; i++) {
753 o = (union acpi_object *)&obj->package.elements[i];
754 if (o->type != ACPI_TYPE_INTEGER) {
755 printk(KERN_ERR PREFIX "Invalid data\n");
756 continue;
757 }
758 br->levels[count] = (u32) o->integer.value;
759
760 if (br->levels[count] > max_level)
761 max_level = br->levels[count];
762 count++;
763 }
764
765 /*
766 * some buggy BIOS don't export the levels
767 * when machine is on AC/Battery in _BCL package.
768 * In this case, the first two elements in _BCL packages
769 * are also supported brightness levels that OS should take care of.
770 */
771 for (i = 2; i < count; i++) {
772 if (br->levels[i] == br->levels[0])
773 level_ac_battery++;
774 if (br->levels[i] == br->levels[1])
775 level_ac_battery++;
776 }
777
778 if (level_ac_battery < 2) {
779 level_ac_battery = 2 - level_ac_battery;
780 br->flags._BCL_no_ac_battery_levels = 1;
781 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
782 br->levels[i] = br->levels[i - level_ac_battery];
783 count += level_ac_battery;
784 } else if (level_ac_battery > 2)
785 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
786
787 /* Check if the _BCL package is in a reversed order */
788 if (max_level == br->levels[2]) {
789 br->flags._BCL_reversed = 1;
790 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
791 acpi_video_cmp_level, NULL);
792 } else if (max_level != br->levels[count - 1])
793 ACPI_ERROR((AE_INFO,
794 "Found unordered _BCL package"));
795
796 br->count = count;
797 device->brightness = br;
798
799 /* Check the input/output of _BQC/_BCL/_BCM */
800 if ((max_level < 100) && (max_level <= (count - 2)))
801 br->flags._BCL_use_index = 1;
802
803 /*
804 * _BCM is always consistent with _BCL,
805 * at least for all the laptops we have ever seen.
806 */
807 br->flags._BCM_use_index = br->flags._BCL_use_index;
808
809 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
810 br->curr = level = max_level;
811
812 if (!device->cap._BQC)
813 goto set_level;
814
815 result = acpi_video_device_lcd_get_level_current(device,
816 &level_old, true);
817 if (result)
818 goto out_free_levels;
819
820 result = acpi_video_bqc_quirk(device, max_level, level_old);
821 if (result)
822 goto out_free_levels;
823 /*
824 * cap._BQC may get cleared due to _BQC is found to be broken
825 * in acpi_video_bqc_quirk, so check again here.
826 */
827 if (!device->cap._BQC)
828 goto set_level;
829
830 if (use_bios_initial_backlight) {
831 level = acpi_video_bqc_value_to_level(device, level_old);
832 /*
833 * On some buggy laptops, _BQC returns an uninitialized
834 * value when invoked for the first time, i.e.
835 * level_old is invalid (no matter whether it's a level
836 * or an index). Set the backlight to max_level in this case.
837 */
838 for (i = 2; i < br->count; i++)
839 if (level_old == br->levels[i])
840 break;
841 if (i == br->count)
842 level = max_level;
843 }
844
845 set_level:
846 result = acpi_video_device_lcd_set_level(device, level);
847 if (result)
848 goto out_free_levels;
849
850 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
851 "found %d brightness levels\n", count - 2));
852 kfree(obj);
853 return result;
854
855 out_free_levels:
856 kfree(br->levels);
857 out_free:
858 kfree(br);
859 out:
860 device->brightness = NULL;
861 kfree(obj);
862 return result;
863 }
864
865 /*
866 * Arg:
867 * device : video output device (LCD, CRT, ..)
868 *
869 * Return Value:
870 * None
871 *
872 * Find out all required AML methods defined under the output
873 * device.
874 */
875
acpi_video_device_find_cap(struct acpi_video_device * device)876 static void acpi_video_device_find_cap(struct acpi_video_device *device)
877 {
878 acpi_handle h_dummy1;
879
880 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
881 device->cap._ADR = 1;
882 }
883 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
884 device->cap._BCL = 1;
885 }
886 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
887 device->cap._BCM = 1;
888 }
889 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
890 device->cap._BQC = 1;
891 else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
892 &h_dummy1))) {
893 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
894 device->cap._BCQ = 1;
895 }
896
897 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
898 device->cap._DDC = 1;
899 }
900
901 if (acpi_video_backlight_support()) {
902 struct backlight_properties props;
903 struct pci_dev *pdev;
904 acpi_handle acpi_parent;
905 struct device *parent = NULL;
906 int result;
907 static int count = 0;
908 char *name;
909
910 result = acpi_video_init_brightness(device);
911 if (result)
912 return;
913 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
914 if (!name)
915 return;
916 count++;
917
918 acpi_get_parent(device->dev->handle, &acpi_parent);
919
920 pdev = acpi_get_pci_dev(acpi_parent);
921 if (pdev) {
922 parent = &pdev->dev;
923 pci_dev_put(pdev);
924 }
925
926 memset(&props, 0, sizeof(struct backlight_properties));
927 props.type = BACKLIGHT_FIRMWARE;
928 props.max_brightness = device->brightness->count - 3;
929 device->backlight = backlight_device_register(name,
930 parent,
931 device,
932 &acpi_backlight_ops,
933 &props);
934 kfree(name);
935 if (IS_ERR(device->backlight))
936 return;
937
938 /*
939 * Save current brightness level in case we have to restore it
940 * before acpi_video_device_lcd_set_level() is called next time.
941 */
942 device->backlight->props.brightness =
943 acpi_video_get_brightness(device->backlight);
944
945 device->cooling_dev = thermal_cooling_device_register("LCD",
946 device->dev, &video_cooling_ops);
947 if (IS_ERR(device->cooling_dev)) {
948 /*
949 * Set cooling_dev to NULL so we don't crash trying to
950 * free it.
951 * Also, why the hell we are returning early and
952 * not attempt to register video output if cooling
953 * device registration failed?
954 * -- dtor
955 */
956 device->cooling_dev = NULL;
957 return;
958 }
959
960 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
961 device->cooling_dev->id);
962 result = sysfs_create_link(&device->dev->dev.kobj,
963 &device->cooling_dev->device.kobj,
964 "thermal_cooling");
965 if (result)
966 printk(KERN_ERR PREFIX "Create sysfs link\n");
967 result = sysfs_create_link(&device->cooling_dev->device.kobj,
968 &device->dev->dev.kobj, "device");
969 if (result)
970 printk(KERN_ERR PREFIX "Create sysfs link\n");
971
972 }
973 }
974
975 /*
976 * Arg:
977 * device : video output device (VGA)
978 *
979 * Return Value:
980 * None
981 *
982 * Find out all required AML methods defined under the video bus device.
983 */
984
acpi_video_bus_find_cap(struct acpi_video_bus * video)985 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
986 {
987 acpi_handle h_dummy1;
988
989 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
990 video->cap._DOS = 1;
991 }
992 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
993 video->cap._DOD = 1;
994 }
995 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
996 video->cap._ROM = 1;
997 }
998 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
999 video->cap._GPD = 1;
1000 }
1001 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
1002 video->cap._SPD = 1;
1003 }
1004 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
1005 video->cap._VPO = 1;
1006 }
1007 }
1008
1009 /*
1010 * Check whether the video bus device has required AML method to
1011 * support the desired features
1012 */
1013
acpi_video_bus_check(struct acpi_video_bus * video)1014 static int acpi_video_bus_check(struct acpi_video_bus *video)
1015 {
1016 acpi_status status = -ENOENT;
1017 struct pci_dev *dev;
1018
1019 if (!video)
1020 return -EINVAL;
1021
1022 dev = acpi_get_pci_dev(video->device->handle);
1023 if (!dev)
1024 return -ENODEV;
1025 pci_dev_put(dev);
1026
1027 /* Since there is no HID, CID and so on for VGA driver, we have
1028 * to check well known required nodes.
1029 */
1030
1031 /* Does this device support video switching? */
1032 if (video->cap._DOS || video->cap._DOD) {
1033 if (!video->cap._DOS) {
1034 printk(KERN_WARNING FW_BUG
1035 "ACPI(%s) defines _DOD but not _DOS\n",
1036 acpi_device_bid(video->device));
1037 }
1038 video->flags.multihead = 1;
1039 status = 0;
1040 }
1041
1042 /* Does this device support retrieving a video ROM? */
1043 if (video->cap._ROM) {
1044 video->flags.rom = 1;
1045 status = 0;
1046 }
1047
1048 /* Does this device support configuring which video device to POST? */
1049 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1050 video->flags.post = 1;
1051 status = 0;
1052 }
1053
1054 return status;
1055 }
1056
1057 /* --------------------------------------------------------------------------
1058 Driver Interface
1059 -------------------------------------------------------------------------- */
1060
1061 /* device interface */
1062 static struct acpi_video_device_attrib*
acpi_video_get_device_attr(struct acpi_video_bus * video,unsigned long device_id)1063 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1064 {
1065 struct acpi_video_enumerated_device *ids;
1066 int i;
1067
1068 for (i = 0; i < video->attached_count; i++) {
1069 ids = &video->attached_array[i];
1070 if ((ids->value.int_val & 0xffff) == device_id)
1071 return &ids->value.attrib;
1072 }
1073
1074 return NULL;
1075 }
1076
1077 static int
acpi_video_get_device_type(struct acpi_video_bus * video,unsigned long device_id)1078 acpi_video_get_device_type(struct acpi_video_bus *video,
1079 unsigned long device_id)
1080 {
1081 struct acpi_video_enumerated_device *ids;
1082 int i;
1083
1084 for (i = 0; i < video->attached_count; i++) {
1085 ids = &video->attached_array[i];
1086 if ((ids->value.int_val & 0xffff) == device_id)
1087 return ids->value.int_val;
1088 }
1089
1090 return 0;
1091 }
1092
1093 static int
acpi_video_bus_get_one_device(struct acpi_device * device,struct acpi_video_bus * video)1094 acpi_video_bus_get_one_device(struct acpi_device *device,
1095 struct acpi_video_bus *video)
1096 {
1097 unsigned long long device_id;
1098 int status, device_type;
1099 struct acpi_video_device *data;
1100 struct acpi_video_device_attrib* attribute;
1101
1102 status =
1103 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1104 /* Some device omits _ADR, we skip them instead of fail */
1105 if (ACPI_FAILURE(status))
1106 return 0;
1107
1108 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1109 if (!data)
1110 return -ENOMEM;
1111
1112 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1113 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1114 device->driver_data = data;
1115
1116 data->device_id = device_id;
1117 data->video = video;
1118 data->dev = device;
1119
1120 attribute = acpi_video_get_device_attr(video, device_id);
1121
1122 if((attribute != NULL) && attribute->device_id_scheme) {
1123 switch (attribute->display_type) {
1124 case ACPI_VIDEO_DISPLAY_CRT:
1125 data->flags.crt = 1;
1126 break;
1127 case ACPI_VIDEO_DISPLAY_TV:
1128 data->flags.tvout = 1;
1129 break;
1130 case ACPI_VIDEO_DISPLAY_DVI:
1131 data->flags.dvi = 1;
1132 break;
1133 case ACPI_VIDEO_DISPLAY_LCD:
1134 data->flags.lcd = 1;
1135 break;
1136 default:
1137 data->flags.unknown = 1;
1138 break;
1139 }
1140 if(attribute->bios_can_detect)
1141 data->flags.bios = 1;
1142 } else {
1143 /* Check for legacy IDs */
1144 device_type = acpi_video_get_device_type(video, device_id);
1145 /* Ignore bits 16 and 18-20 */
1146 switch (device_type & 0xffe2ffff) {
1147 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1148 data->flags.crt = 1;
1149 break;
1150 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1151 data->flags.lcd = 1;
1152 break;
1153 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1154 data->flags.tvout = 1;
1155 break;
1156 default:
1157 data->flags.unknown = 1;
1158 }
1159 }
1160
1161 acpi_video_device_bind(video, data);
1162 acpi_video_device_find_cap(data);
1163
1164 status = acpi_install_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
1165 acpi_video_device_notify, data);
1166 if (ACPI_FAILURE(status))
1167 dev_err(&device->dev, "Error installing notify handler\n");
1168 else
1169 data->flags.notify = 1;
1170
1171 mutex_lock(&video->device_list_lock);
1172 list_add_tail(&data->entry, &video->video_device_list);
1173 mutex_unlock(&video->device_list_lock);
1174
1175 return status;
1176 }
1177
1178 /*
1179 * Arg:
1180 * video : video bus device
1181 *
1182 * Return:
1183 * none
1184 *
1185 * Enumerate the video device list of the video bus,
1186 * bind the ids with the corresponding video devices
1187 * under the video bus.
1188 */
1189
acpi_video_device_rebind(struct acpi_video_bus * video)1190 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1191 {
1192 struct acpi_video_device *dev;
1193
1194 mutex_lock(&video->device_list_lock);
1195
1196 list_for_each_entry(dev, &video->video_device_list, entry)
1197 acpi_video_device_bind(video, dev);
1198
1199 mutex_unlock(&video->device_list_lock);
1200 }
1201
1202 /*
1203 * Arg:
1204 * video : video bus device
1205 * device : video output device under the video
1206 * bus
1207 *
1208 * Return:
1209 * none
1210 *
1211 * Bind the ids with the corresponding video devices
1212 * under the video bus.
1213 */
1214
1215 static void
acpi_video_device_bind(struct acpi_video_bus * video,struct acpi_video_device * device)1216 acpi_video_device_bind(struct acpi_video_bus *video,
1217 struct acpi_video_device *device)
1218 {
1219 struct acpi_video_enumerated_device *ids;
1220 int i;
1221
1222 for (i = 0; i < video->attached_count; i++) {
1223 ids = &video->attached_array[i];
1224 if (device->device_id == (ids->value.int_val & 0xffff)) {
1225 ids->bind_info = device;
1226 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1227 }
1228 }
1229 }
1230
1231 /*
1232 * Arg:
1233 * video : video bus device
1234 *
1235 * Return:
1236 * < 0 : error
1237 *
1238 * Call _DOD to enumerate all devices attached to display adapter
1239 *
1240 */
1241
acpi_video_device_enumerate(struct acpi_video_bus * video)1242 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1243 {
1244 int status;
1245 int count;
1246 int i;
1247 struct acpi_video_enumerated_device *active_list;
1248 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1249 union acpi_object *dod = NULL;
1250 union acpi_object *obj;
1251
1252 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1253 if (!ACPI_SUCCESS(status)) {
1254 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1255 return status;
1256 }
1257
1258 dod = buffer.pointer;
1259 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1260 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1261 status = -EFAULT;
1262 goto out;
1263 }
1264
1265 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1266 dod->package.count));
1267
1268 active_list = kcalloc(1 + dod->package.count,
1269 sizeof(struct acpi_video_enumerated_device),
1270 GFP_KERNEL);
1271 if (!active_list) {
1272 status = -ENOMEM;
1273 goto out;
1274 }
1275
1276 count = 0;
1277 for (i = 0; i < dod->package.count; i++) {
1278 obj = &dod->package.elements[i];
1279
1280 if (obj->type != ACPI_TYPE_INTEGER) {
1281 printk(KERN_ERR PREFIX
1282 "Invalid _DOD data in element %d\n", i);
1283 continue;
1284 }
1285
1286 active_list[count].value.int_val = obj->integer.value;
1287 active_list[count].bind_info = NULL;
1288 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1289 (int)obj->integer.value));
1290 count++;
1291 }
1292
1293 kfree(video->attached_array);
1294
1295 video->attached_array = active_list;
1296 video->attached_count = count;
1297
1298 out:
1299 kfree(buffer.pointer);
1300 return status;
1301 }
1302
1303 static int
acpi_video_get_next_level(struct acpi_video_device * device,u32 level_current,u32 event)1304 acpi_video_get_next_level(struct acpi_video_device *device,
1305 u32 level_current, u32 event)
1306 {
1307 int min, max, min_above, max_below, i, l, delta = 255;
1308 max = max_below = 0;
1309 min = min_above = 255;
1310 /* Find closest level to level_current */
1311 for (i = 2; i < device->brightness->count; i++) {
1312 l = device->brightness->levels[i];
1313 if (abs(l - level_current) < abs(delta)) {
1314 delta = l - level_current;
1315 if (!delta)
1316 break;
1317 }
1318 }
1319 /* Ajust level_current to closest available level */
1320 level_current += delta;
1321 for (i = 2; i < device->brightness->count; i++) {
1322 l = device->brightness->levels[i];
1323 if (l < min)
1324 min = l;
1325 if (l > max)
1326 max = l;
1327 if (l < min_above && l > level_current)
1328 min_above = l;
1329 if (l > max_below && l < level_current)
1330 max_below = l;
1331 }
1332
1333 switch (event) {
1334 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1335 return (level_current < max) ? min_above : min;
1336 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1337 return (level_current < max) ? min_above : max;
1338 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1339 return (level_current > min) ? max_below : min;
1340 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1341 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1342 return 0;
1343 default:
1344 return level_current;
1345 }
1346 }
1347
1348 static int
acpi_video_switch_brightness(struct acpi_video_device * device,int event)1349 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1350 {
1351 unsigned long long level_current, level_next;
1352 int result = -EINVAL;
1353
1354 /* no warning message if acpi_backlight=vendor is used */
1355 if (!acpi_video_backlight_support())
1356 return 0;
1357
1358 if (!device->brightness)
1359 goto out;
1360
1361 result = acpi_video_device_lcd_get_level_current(device,
1362 &level_current,
1363 false);
1364 if (result)
1365 goto out;
1366
1367 level_next = acpi_video_get_next_level(device, level_current, event);
1368
1369 result = acpi_video_device_lcd_set_level(device, level_next);
1370
1371 if (!result)
1372 backlight_force_update(device->backlight,
1373 BACKLIGHT_UPDATE_HOTKEY);
1374
1375 out:
1376 if (result)
1377 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1378
1379 return result;
1380 }
1381
acpi_video_get_edid(struct acpi_device * device,int type,int device_id,void ** edid)1382 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1383 void **edid)
1384 {
1385 struct acpi_video_bus *video;
1386 struct acpi_video_device *video_device;
1387 union acpi_object *buffer = NULL;
1388 acpi_status status;
1389 int i, length;
1390
1391 if (!device || !acpi_driver_data(device))
1392 return -EINVAL;
1393
1394 video = acpi_driver_data(device);
1395
1396 for (i = 0; i < video->attached_count; i++) {
1397 video_device = video->attached_array[i].bind_info;
1398 length = 256;
1399
1400 if (!video_device)
1401 continue;
1402
1403 if (!video_device->cap._DDC)
1404 continue;
1405
1406 if (type) {
1407 switch (type) {
1408 case ACPI_VIDEO_DISPLAY_CRT:
1409 if (!video_device->flags.crt)
1410 continue;
1411 break;
1412 case ACPI_VIDEO_DISPLAY_TV:
1413 if (!video_device->flags.tvout)
1414 continue;
1415 break;
1416 case ACPI_VIDEO_DISPLAY_DVI:
1417 if (!video_device->flags.dvi)
1418 continue;
1419 break;
1420 case ACPI_VIDEO_DISPLAY_LCD:
1421 if (!video_device->flags.lcd)
1422 continue;
1423 break;
1424 }
1425 } else if (video_device->device_id != device_id) {
1426 continue;
1427 }
1428
1429 status = acpi_video_device_EDID(video_device, &buffer, length);
1430
1431 if (ACPI_FAILURE(status) || !buffer ||
1432 buffer->type != ACPI_TYPE_BUFFER) {
1433 length = 128;
1434 status = acpi_video_device_EDID(video_device, &buffer,
1435 length);
1436 if (ACPI_FAILURE(status) || !buffer ||
1437 buffer->type != ACPI_TYPE_BUFFER) {
1438 continue;
1439 }
1440 }
1441
1442 *edid = buffer->buffer.pointer;
1443 return length;
1444 }
1445
1446 return -ENODEV;
1447 }
1448 EXPORT_SYMBOL(acpi_video_get_edid);
1449
1450 static int
acpi_video_bus_get_devices(struct acpi_video_bus * video,struct acpi_device * device)1451 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1452 struct acpi_device *device)
1453 {
1454 int status = 0;
1455 struct acpi_device *dev;
1456
1457 /*
1458 * There are systems where video module known to work fine regardless
1459 * of broken _DOD and ignoring returned value here doesn't cause
1460 * any issues later.
1461 */
1462 acpi_video_device_enumerate(video);
1463
1464 list_for_each_entry(dev, &device->children, node) {
1465
1466 status = acpi_video_bus_get_one_device(dev, video);
1467 if (status) {
1468 dev_err(&dev->dev, "Can't attach device\n");
1469 break;
1470 }
1471 }
1472 return status;
1473 }
1474
acpi_video_bus_put_one_device(struct acpi_video_device * device)1475 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1476 {
1477 acpi_status status;
1478
1479 if (!device || !device->video)
1480 return -ENOENT;
1481
1482 if (device->flags.notify) {
1483 status = acpi_remove_notify_handler(device->dev->handle,
1484 ACPI_DEVICE_NOTIFY, acpi_video_device_notify);
1485 if (ACPI_FAILURE(status))
1486 dev_err(&device->dev->dev,
1487 "Can't remove video notify handler\n");
1488 }
1489
1490 if (device->backlight) {
1491 backlight_device_unregister(device->backlight);
1492 device->backlight = NULL;
1493 }
1494 if (device->cooling_dev) {
1495 sysfs_remove_link(&device->dev->dev.kobj,
1496 "thermal_cooling");
1497 sysfs_remove_link(&device->cooling_dev->device.kobj,
1498 "device");
1499 thermal_cooling_device_unregister(device->cooling_dev);
1500 device->cooling_dev = NULL;
1501 }
1502
1503 return 0;
1504 }
1505
acpi_video_bus_put_devices(struct acpi_video_bus * video)1506 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1507 {
1508 int status;
1509 struct acpi_video_device *dev, *next;
1510
1511 mutex_lock(&video->device_list_lock);
1512
1513 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1514
1515 status = acpi_video_bus_put_one_device(dev);
1516 if (ACPI_FAILURE(status))
1517 printk(KERN_WARNING PREFIX
1518 "hhuuhhuu bug in acpi video driver.\n");
1519
1520 if (dev->brightness) {
1521 kfree(dev->brightness->levels);
1522 kfree(dev->brightness);
1523 }
1524 list_del(&dev->entry);
1525 kfree(dev);
1526 }
1527
1528 mutex_unlock(&video->device_list_lock);
1529
1530 return 0;
1531 }
1532
1533 /* acpi_video interface */
1534
acpi_video_bus_start_devices(struct acpi_video_bus * video)1535 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1536 {
1537 return acpi_video_bus_DOS(video, 0, 0);
1538 }
1539
acpi_video_bus_stop_devices(struct acpi_video_bus * video)1540 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1541 {
1542 return acpi_video_bus_DOS(video, 0, 1);
1543 }
1544
acpi_video_bus_notify(struct acpi_device * device,u32 event)1545 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1546 {
1547 struct acpi_video_bus *video = acpi_driver_data(device);
1548 struct input_dev *input;
1549 int keycode = 0;
1550
1551 if (!video)
1552 return;
1553
1554 input = video->input;
1555
1556 switch (event) {
1557 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1558 * most likely via hotkey. */
1559 acpi_bus_generate_proc_event(device, event, 0);
1560 keycode = KEY_SWITCHVIDEOMODE;
1561 break;
1562
1563 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1564 * connector. */
1565 acpi_video_device_enumerate(video);
1566 acpi_video_device_rebind(video);
1567 acpi_bus_generate_proc_event(device, event, 0);
1568 keycode = KEY_SWITCHVIDEOMODE;
1569 break;
1570
1571 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1572 acpi_bus_generate_proc_event(device, event, 0);
1573 keycode = KEY_SWITCHVIDEOMODE;
1574 break;
1575 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1576 acpi_bus_generate_proc_event(device, event, 0);
1577 keycode = KEY_VIDEO_NEXT;
1578 break;
1579 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1580 acpi_bus_generate_proc_event(device, event, 0);
1581 keycode = KEY_VIDEO_PREV;
1582 break;
1583
1584 default:
1585 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1586 "Unsupported event [0x%x]\n", event));
1587 break;
1588 }
1589
1590 if (acpi_notifier_call_chain(device, event, 0))
1591 /* Something vetoed the keypress. */
1592 keycode = 0;
1593
1594 if (keycode) {
1595 input_report_key(input, keycode, 1);
1596 input_sync(input);
1597 input_report_key(input, keycode, 0);
1598 input_sync(input);
1599 }
1600
1601 return;
1602 }
1603
acpi_video_device_notify(acpi_handle handle,u32 event,void * data)1604 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1605 {
1606 struct acpi_video_device *video_device = data;
1607 struct acpi_device *device = NULL;
1608 struct acpi_video_bus *bus;
1609 struct input_dev *input;
1610 int keycode = 0;
1611
1612 if (!video_device)
1613 return;
1614
1615 device = video_device->dev;
1616 bus = video_device->video;
1617 input = bus->input;
1618
1619 switch (event) {
1620 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1621 if (brightness_switch_enabled)
1622 acpi_video_switch_brightness(video_device, event);
1623 acpi_bus_generate_proc_event(device, event, 0);
1624 keycode = KEY_BRIGHTNESS_CYCLE;
1625 break;
1626 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1627 if (brightness_switch_enabled)
1628 acpi_video_switch_brightness(video_device, event);
1629 acpi_bus_generate_proc_event(device, event, 0);
1630 keycode = KEY_BRIGHTNESSUP;
1631 break;
1632 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1633 if (brightness_switch_enabled)
1634 acpi_video_switch_brightness(video_device, event);
1635 acpi_bus_generate_proc_event(device, event, 0);
1636 keycode = KEY_BRIGHTNESSDOWN;
1637 break;
1638 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1639 if (brightness_switch_enabled)
1640 acpi_video_switch_brightness(video_device, event);
1641 acpi_bus_generate_proc_event(device, event, 0);
1642 keycode = KEY_BRIGHTNESS_ZERO;
1643 break;
1644 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1645 if (brightness_switch_enabled)
1646 acpi_video_switch_brightness(video_device, event);
1647 acpi_bus_generate_proc_event(device, event, 0);
1648 keycode = KEY_DISPLAY_OFF;
1649 break;
1650 default:
1651 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1652 "Unsupported event [0x%x]\n", event));
1653 break;
1654 }
1655
1656 acpi_notifier_call_chain(device, event, 0);
1657
1658 if (keycode) {
1659 input_report_key(input, keycode, 1);
1660 input_sync(input);
1661 input_report_key(input, keycode, 0);
1662 input_sync(input);
1663 }
1664
1665 return;
1666 }
1667
acpi_video_resume(struct notifier_block * nb,unsigned long val,void * ign)1668 static int acpi_video_resume(struct notifier_block *nb,
1669 unsigned long val, void *ign)
1670 {
1671 struct acpi_video_bus *video;
1672 struct acpi_video_device *video_device;
1673 int i;
1674
1675 switch (val) {
1676 case PM_HIBERNATION_PREPARE:
1677 case PM_SUSPEND_PREPARE:
1678 case PM_RESTORE_PREPARE:
1679 return NOTIFY_DONE;
1680 }
1681
1682 video = container_of(nb, struct acpi_video_bus, pm_nb);
1683
1684 dev_info(&video->device->dev, "Restoring backlight state\n");
1685
1686 for (i = 0; i < video->attached_count; i++) {
1687 video_device = video->attached_array[i].bind_info;
1688 if (video_device && video_device->backlight)
1689 acpi_video_set_brightness(video_device->backlight);
1690 }
1691
1692 return NOTIFY_OK;
1693 }
1694
1695 static acpi_status
acpi_video_bus_match(acpi_handle handle,u32 level,void * context,void ** return_value)1696 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1697 void **return_value)
1698 {
1699 struct acpi_device *device = context;
1700 struct acpi_device *sibling;
1701 int result;
1702
1703 if (handle == device->handle)
1704 return AE_CTRL_TERMINATE;
1705
1706 result = acpi_bus_get_device(handle, &sibling);
1707 if (result)
1708 return AE_OK;
1709
1710 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1711 return AE_ALREADY_EXISTS;
1712
1713 return AE_OK;
1714 }
1715
1716 static int instance;
1717
acpi_video_bus_add(struct acpi_device * device)1718 static int acpi_video_bus_add(struct acpi_device *device)
1719 {
1720 struct acpi_video_bus *video;
1721 struct input_dev *input;
1722 int error;
1723 acpi_status status;
1724
1725 if (device->handler)
1726 return -EINVAL;
1727
1728 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1729 device->parent->handle, 1,
1730 acpi_video_bus_match, NULL,
1731 device, NULL);
1732 if (status == AE_ALREADY_EXISTS) {
1733 printk(KERN_WARNING FW_BUG
1734 "Duplicate ACPI video bus devices for the"
1735 " same VGA controller, please try module "
1736 "parameter \"video.allow_duplicates=1\""
1737 "if the current driver doesn't work.\n");
1738 if (!allow_duplicates)
1739 return -ENODEV;
1740 }
1741
1742 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1743 if (!video)
1744 return -ENOMEM;
1745
1746 /* a hack to fix the duplicate name "VID" problem on T61 */
1747 if (!strcmp(device->pnp.bus_id, "VID")) {
1748 if (instance)
1749 device->pnp.bus_id[3] = '0' + instance;
1750 instance ++;
1751 }
1752 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1753 if (!strcmp(device->pnp.bus_id, "VGA")) {
1754 if (instance)
1755 device->pnp.bus_id[3] = '0' + instance;
1756 instance++;
1757 }
1758
1759 video->device = device;
1760 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1761 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1762 device->driver_data = video;
1763
1764 acpi_video_bus_find_cap(video);
1765 error = acpi_video_bus_check(video);
1766 if (error)
1767 goto err_free_video;
1768
1769 mutex_init(&video->device_list_lock);
1770 INIT_LIST_HEAD(&video->video_device_list);
1771
1772 error = acpi_video_bus_get_devices(video, device);
1773 if (error)
1774 goto err_put_video;
1775
1776 video->input = input = input_allocate_device();
1777 if (!input) {
1778 error = -ENOMEM;
1779 goto err_put_video;
1780 }
1781
1782 error = acpi_video_bus_start_devices(video);
1783 if (error)
1784 goto err_free_input_dev;
1785
1786 snprintf(video->phys, sizeof(video->phys),
1787 "%s/video/input0", acpi_device_hid(video->device));
1788
1789 input->name = acpi_device_name(video->device);
1790 input->phys = video->phys;
1791 input->id.bustype = BUS_HOST;
1792 input->id.product = 0x06;
1793 input->dev.parent = &device->dev;
1794 input->evbit[0] = BIT(EV_KEY);
1795 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1796 set_bit(KEY_VIDEO_NEXT, input->keybit);
1797 set_bit(KEY_VIDEO_PREV, input->keybit);
1798 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1799 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1800 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1801 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1802 set_bit(KEY_DISPLAY_OFF, input->keybit);
1803
1804 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
1805 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1806 video->flags.multihead ? "yes" : "no",
1807 video->flags.rom ? "yes" : "no",
1808 video->flags.post ? "yes" : "no");
1809
1810 video->pm_nb.notifier_call = acpi_video_resume;
1811 video->pm_nb.priority = 0;
1812 error = register_pm_notifier(&video->pm_nb);
1813 if (error)
1814 goto err_stop_video;
1815
1816 error = input_register_device(input);
1817 if (error)
1818 goto err_unregister_pm_notifier;
1819
1820 return 0;
1821
1822 err_unregister_pm_notifier:
1823 unregister_pm_notifier(&video->pm_nb);
1824 err_stop_video:
1825 acpi_video_bus_stop_devices(video);
1826 err_free_input_dev:
1827 input_free_device(input);
1828 err_put_video:
1829 acpi_video_bus_put_devices(video);
1830 kfree(video->attached_array);
1831 err_free_video:
1832 kfree(video);
1833 device->driver_data = NULL;
1834
1835 return error;
1836 }
1837
acpi_video_bus_remove(struct acpi_device * device)1838 static int acpi_video_bus_remove(struct acpi_device *device)
1839 {
1840 struct acpi_video_bus *video = NULL;
1841
1842
1843 if (!device || !acpi_driver_data(device))
1844 return -EINVAL;
1845
1846 video = acpi_driver_data(device);
1847
1848 unregister_pm_notifier(&video->pm_nb);
1849
1850 acpi_video_bus_stop_devices(video);
1851 acpi_video_bus_put_devices(video);
1852
1853 input_unregister_device(video->input);
1854 kfree(video->attached_array);
1855 kfree(video);
1856
1857 return 0;
1858 }
1859
is_i740(struct pci_dev * dev)1860 static int __init is_i740(struct pci_dev *dev)
1861 {
1862 if (dev->device == 0x00D1)
1863 return 1;
1864 if (dev->device == 0x7000)
1865 return 1;
1866 return 0;
1867 }
1868
intel_opregion_present(void)1869 static int __init intel_opregion_present(void)
1870 {
1871 int opregion = 0;
1872 struct pci_dev *dev = NULL;
1873 u32 address;
1874
1875 for_each_pci_dev(dev) {
1876 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1877 continue;
1878 if (dev->vendor != PCI_VENDOR_ID_INTEL)
1879 continue;
1880 /* We don't want to poke around undefined i740 registers */
1881 if (is_i740(dev))
1882 continue;
1883 pci_read_config_dword(dev, 0xfc, &address);
1884 if (!address)
1885 continue;
1886 opregion = 1;
1887 }
1888 return opregion;
1889 }
1890
acpi_video_register(void)1891 int acpi_video_register(void)
1892 {
1893 int result = 0;
1894 if (register_count) {
1895 /*
1896 * if the function of acpi_video_register is already called,
1897 * don't register the acpi_vide_bus again and return no error.
1898 */
1899 return 0;
1900 }
1901
1902 result = acpi_bus_register_driver(&acpi_video_bus);
1903 if (result < 0)
1904 return -ENODEV;
1905
1906 /*
1907 * When the acpi_video_bus is loaded successfully, increase
1908 * the counter reference.
1909 */
1910 register_count = 1;
1911
1912 return 0;
1913 }
1914 EXPORT_SYMBOL(acpi_video_register);
1915
acpi_video_unregister(void)1916 void acpi_video_unregister(void)
1917 {
1918 if (!register_count) {
1919 /*
1920 * If the acpi video bus is already unloaded, don't
1921 * unload it again and return directly.
1922 */
1923 return;
1924 }
1925 acpi_bus_unregister_driver(&acpi_video_bus);
1926
1927 register_count = 0;
1928
1929 return;
1930 }
1931 EXPORT_SYMBOL(acpi_video_unregister);
1932
1933 /*
1934 * This is kind of nasty. Hardware using Intel chipsets may require
1935 * the video opregion code to be run first in order to initialise
1936 * state before any ACPI video calls are made. To handle this we defer
1937 * registration of the video class until the opregion code has run.
1938 */
1939
acpi_video_init(void)1940 static int __init acpi_video_init(void)
1941 {
1942 dmi_check_system(video_dmi_table);
1943
1944 if (intel_opregion_present())
1945 return 0;
1946
1947 return acpi_video_register();
1948 }
1949
acpi_video_exit(void)1950 static void __exit acpi_video_exit(void)
1951 {
1952 acpi_video_unregister();
1953
1954 return;
1955 }
1956
1957 module_init(acpi_video_init);
1958 module_exit(acpi_video_exit);
1959