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video.c
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1 /*
2  * video.c - ACPI Video Driver ($Revision:$)
3  *
4  * Copyright (C) 2004 Luming Yu <[email protected]>
5  * Copyright (C) 2004 Bruno Ducrot <[email protected]>
6  * Copyright (C) 2006 Thomas Tuttle <[email protected]>
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, int type);
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 reserved:2;
171 };
172 
173 struct acpi_video_device_cap {
174  u8 _ADR:1; /*Return the unique ID */
175  u8 _BCL:1; /*Query list of brightness control levels supported */
176  u8 _BCM:1; /*Set the brightness level */
177  u8 _BQC:1; /* Get current brightness level */
178  u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
179  u8 _DDC:1; /*Return the EDID for this device */
180 };
181 
182 struct acpi_video_brightness_flags {
183  u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
184  u8 _BCL_reversed:1; /* _BCL package is in a reversed order*/
185  u8 _BCL_use_index:1; /* levels in _BCL are index values */
186  u8 _BCM_use_index:1; /* input of _BCM is an index value */
187  u8 _BQC_use_index:1; /* _BQC returns an index value */
188 };
189 
190 struct acpi_video_device_brightness {
191  int curr;
192  int count;
193  int *levels;
194  struct acpi_video_brightness_flags flags;
195 };
196 
197 struct acpi_video_device {
198  unsigned long device_id;
199  struct acpi_video_device_flags flags;
200  struct acpi_video_device_cap cap;
201  struct list_head entry;
202  struct acpi_video_bus *video;
203  struct acpi_device *dev;
204  struct acpi_video_device_brightness *brightness;
205  struct backlight_device *backlight;
206  struct thermal_cooling_device *cooling_dev;
207 };
208 
209 static const char device_decode[][30] = {
210  "motherboard VGA device",
211  "PCI VGA device",
212  "AGP VGA device",
213  "UNKNOWN",
214 };
215 
216 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
217 static void acpi_video_device_rebind(struct acpi_video_bus *video);
218 static void acpi_video_device_bind(struct acpi_video_bus *video,
219  struct acpi_video_device *device);
220 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
221 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
222  int level);
223 static int acpi_video_device_lcd_get_level_current(
224  struct acpi_video_device *device,
225  unsigned long long *level, int init);
226 static int acpi_video_get_next_level(struct acpi_video_device *device,
227  u32 level_current, u32 event);
228 static int acpi_video_switch_brightness(struct acpi_video_device *device,
229  int event);
230 
231 /*backlight device sysfs support*/
232 static int acpi_video_get_brightness(struct backlight_device *bd)
233 {
234  unsigned long long cur_level;
235  int i;
236  struct acpi_video_device *vd =
237  (struct acpi_video_device *)bl_get_data(bd);
238 
239  if (acpi_video_device_lcd_get_level_current(vd, &cur_level, 0))
240  return -EINVAL;
241  for (i = 2; i < vd->brightness->count; i++) {
242  if (vd->brightness->levels[i] == cur_level)
243  /* The first two entries are special - see page 575
244  of the ACPI spec 3.0 */
245  return i-2;
246  }
247  return 0;
248 }
249 
250 static int acpi_video_set_brightness(struct backlight_device *bd)
251 {
252  int request_level = bd->props.brightness + 2;
253  struct acpi_video_device *vd =
254  (struct acpi_video_device *)bl_get_data(bd);
255 
256  return acpi_video_device_lcd_set_level(vd,
257  vd->brightness->levels[request_level]);
258 }
259 
260 static const struct backlight_ops acpi_backlight_ops = {
261  .get_brightness = acpi_video_get_brightness,
262  .update_status = acpi_video_set_brightness,
263 };
264 
265 /* thermal cooling device callbacks */
266 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
267  long *state)
268 {
269  struct acpi_device *device = cooling_dev->devdata;
270  struct acpi_video_device *video = acpi_driver_data(device);
271 
272  *state = video->brightness->count - 3;
273  return 0;
274 }
275 
276 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
277  long *state)
278 {
279  struct acpi_device *device = cooling_dev->devdata;
280  struct acpi_video_device *video = acpi_driver_data(device);
281  unsigned long long level;
282  int offset;
283 
284  if (acpi_video_device_lcd_get_level_current(video, &level, 0))
285  return -EINVAL;
286  for (offset = 2; offset < video->brightness->count; offset++)
287  if (level == video->brightness->levels[offset]) {
288  *state = video->brightness->count - offset - 1;
289  return 0;
290  }
291 
292  return -EINVAL;
293 }
294 
295 static int
296 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
297 {
298  struct acpi_device *device = cooling_dev->devdata;
299  struct acpi_video_device *video = acpi_driver_data(device);
300  int level;
301 
302  if ( state >= video->brightness->count - 2)
303  return -EINVAL;
304 
305  state = video->brightness->count - state;
306  level = video->brightness->levels[state -1];
307  return acpi_video_device_lcd_set_level(video, level);
308 }
309 
310 static const struct thermal_cooling_device_ops video_cooling_ops = {
311  .get_max_state = video_get_max_state,
312  .get_cur_state = video_get_cur_state,
313  .set_cur_state = video_set_cur_state,
314 };
315 
316 /* --------------------------------------------------------------------------
317  Video Management
318  -------------------------------------------------------------------------- */
319 
320 static int
321 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
322  union acpi_object **levels)
323 {
324  int status;
325  struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
326  union acpi_object *obj;
327 
328 
329  *levels = NULL;
330 
331  status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
332  if (!ACPI_SUCCESS(status))
333  return status;
334  obj = (union acpi_object *)buffer.pointer;
335  if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
336  printk(KERN_ERR PREFIX "Invalid _BCL data\n");
337  status = -EFAULT;
338  goto err;
339  }
340 
341  *levels = obj;
342 
343  return 0;
344 
345  err:
346  kfree(buffer.pointer);
347 
348  return status;
349 }
350 
351 static int
352 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
353 {
354  int status;
355  union acpi_object arg0 = { ACPI_TYPE_INTEGER };
356  struct acpi_object_list args = { 1, &arg0 };
357  int state;
358 
359  arg0.integer.value = level;
360 
361  status = acpi_evaluate_object(device->dev->handle, "_BCM",
362  &args, NULL);
363  if (ACPI_FAILURE(status)) {
364  ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
365  return -EIO;
366  }
367 
368  device->brightness->curr = level;
369  for (state = 2; state < device->brightness->count; state++)
370  if (level == device->brightness->levels[state]) {
371  if (device->backlight)
372  device->backlight->props.brightness = state - 2;
373  return 0;
374  }
375 
376  ACPI_ERROR((AE_INFO, "Current brightness invalid"));
377  return -EINVAL;
378 }
379 
380 /*
381  * For some buggy _BQC methods, we need to add a constant value to
382  * the _BQC return value to get the actual current brightness level
383  */
384 
385 static int bqc_offset_aml_bug_workaround;
386 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
387 {
388  bqc_offset_aml_bug_workaround = 9;
389  return 0;
390 }
391 
392 static int video_ignore_initial_backlight(const struct dmi_system_id *d)
393 {
394  use_bios_initial_backlight = 0;
395  return 0;
396 }
397 
398 static struct dmi_system_id video_dmi_table[] __initdata = {
399  /*
400  * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
401  */
402  {
403  .callback = video_set_bqc_offset,
404  .ident = "Acer Aspire 5720",
405  .matches = {
406  DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
407  DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
408  },
409  },
410  {
411  .callback = video_set_bqc_offset,
412  .ident = "Acer Aspire 5710Z",
413  .matches = {
414  DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
415  DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
416  },
417  },
418  {
419  .callback = video_set_bqc_offset,
420  .ident = "eMachines E510",
421  .matches = {
422  DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
423  DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
424  },
425  },
426  {
427  .callback = video_set_bqc_offset,
428  .ident = "Acer Aspire 5315",
429  .matches = {
430  DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
431  DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
432  },
433  },
434  {
435  .callback = video_set_bqc_offset,
436  .ident = "Acer Aspire 7720",
437  .matches = {
438  DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
439  DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
440  },
441  },
442  {
443  .callback = video_ignore_initial_backlight,
444  .ident = "HP Folio 13-2000",
445  .matches = {
446  DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
447  DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13 - 2000 Notebook PC"),
448  },
449  },
450  {}
451 };
452 
453 static int
454 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
455  unsigned long long *level, int init)
456 {
457  acpi_status status = AE_OK;
458  int i;
459 
460  if (device->cap._BQC || device->cap._BCQ) {
461  char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
462 
463  status = acpi_evaluate_integer(device->dev->handle, buf,
464  NULL, level);
465  if (ACPI_SUCCESS(status)) {
466  if (device->brightness->flags._BQC_use_index) {
467  if (device->brightness->flags._BCL_reversed)
468  *level = device->brightness->count
469  - 3 - (*level);
470  *level = device->brightness->levels[*level + 2];
471 
472  }
473  *level += bqc_offset_aml_bug_workaround;
474  for (i = 2; i < device->brightness->count; i++)
475  if (device->brightness->levels[i] == *level) {
476  device->brightness->curr = *level;
477  return 0;
478  }
479  if (!init) {
480  /*
481  * BQC returned an invalid level.
482  * Stop using it.
483  */
484  ACPI_WARNING((AE_INFO,
485  "%s returned an invalid level",
486  buf));
487  device->cap._BQC = device->cap._BCQ = 0;
488  }
489  } else {
490  /* Fixme:
491  * should we return an error or ignore this failure?
492  * dev->brightness->curr is a cached value which stores
493  * the correct current backlight level in most cases.
494  * ACPI video backlight still works w/ buggy _BQC.
495  * http://bugzilla.kernel.org/show_bug.cgi?id=12233
496  */
497  ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
498  device->cap._BQC = device->cap._BCQ = 0;
499  }
500  }
501 
502  *level = device->brightness->curr;
503  return 0;
504 }
505 
506 static int
507 acpi_video_device_EDID(struct acpi_video_device *device,
508  union acpi_object **edid, ssize_t length)
509 {
510  int status;
511  struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
512  union acpi_object *obj;
513  union acpi_object arg0 = { ACPI_TYPE_INTEGER };
514  struct acpi_object_list args = { 1, &arg0 };
515 
516 
517  *edid = NULL;
518 
519  if (!device)
520  return -ENODEV;
521  if (length == 128)
522  arg0.integer.value = 1;
523  else if (length == 256)
524  arg0.integer.value = 2;
525  else
526  return -EINVAL;
527 
528  status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
529  if (ACPI_FAILURE(status))
530  return -ENODEV;
531 
532  obj = buffer.pointer;
533 
534  if (obj && obj->type == ACPI_TYPE_BUFFER)
535  *edid = obj;
536  else {
537  printk(KERN_ERR PREFIX "Invalid _DDC data\n");
538  status = -EFAULT;
539  kfree(obj);
540  }
541 
542  return status;
543 }
544 
545 /* bus */
546 
547 /*
548  * Arg:
549  * video : video bus device pointer
550  * bios_flag :
551  * 0. The system BIOS should NOT automatically switch(toggle)
552  * the active display output.
553  * 1. The system BIOS should automatically switch (toggle) the
554  * active display output. No switch event.
555  * 2. The _DGS value should be locked.
556  * 3. The system BIOS should not automatically switch (toggle) the
557  * active display output, but instead generate the display switch
558  * event notify code.
559  * lcd_flag :
560  * 0. The system BIOS should automatically control the brightness level
561  * of the LCD when the power changes from AC to DC
562  * 1. The system BIOS should NOT automatically control the brightness
563  * level of the LCD when the power changes from AC to DC.
564  * Return Value:
565  * -EINVAL wrong arg.
566  */
567 
568 static int
569 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
570 {
571  acpi_status status;
572  union acpi_object arg0 = { ACPI_TYPE_INTEGER };
573  struct acpi_object_list args = { 1, &arg0 };
574 
575  if (!video->cap._DOS)
576  return 0;
577 
578  if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
579  return -EINVAL;
580  arg0.integer.value = (lcd_flag << 2) | bios_flag;
581  video->dos_setting = arg0.integer.value;
582  status = acpi_evaluate_object(video->device->handle, "_DOS",
583  &args, NULL);
584  if (ACPI_FAILURE(status))
585  return -EIO;
586 
587  return 0;
588 }
589 
590 /*
591  * Simple comparison function used to sort backlight levels.
592  */
593 
594 static int
595 acpi_video_cmp_level(const void *a, const void *b)
596 {
597  return *(int *)a - *(int *)b;
598 }
599 
600 /*
601  * Arg:
602  * device : video output device (LCD, CRT, ..)
603  *
604  * Return Value:
605  * Maximum brightness level
606  *
607  * Allocate and initialize device->brightness.
608  */
609 
610 static int
611 acpi_video_init_brightness(struct acpi_video_device *device)
612 {
613  union acpi_object *obj = NULL;
614  int i, max_level = 0, count = 0, level_ac_battery = 0;
615  unsigned long long level, level_old;
616  union acpi_object *o;
617  struct acpi_video_device_brightness *br = NULL;
618  int result = -EINVAL;
619 
620  if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
621  ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
622  "LCD brightness level\n"));
623  goto out;
624  }
625 
626  if (obj->package.count < 2)
627  goto out;
628 
629  br = kzalloc(sizeof(*br), GFP_KERNEL);
630  if (!br) {
631  printk(KERN_ERR "can't allocate memory\n");
632  result = -ENOMEM;
633  goto out;
634  }
635 
636  br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
637  GFP_KERNEL);
638  if (!br->levels) {
639  result = -ENOMEM;
640  goto out_free;
641  }
642 
643  for (i = 0; i < obj->package.count; i++) {
644  o = (union acpi_object *)&obj->package.elements[i];
645  if (o->type != ACPI_TYPE_INTEGER) {
646  printk(KERN_ERR PREFIX "Invalid data\n");
647  continue;
648  }
649  br->levels[count] = (u32) o->integer.value;
650 
651  if (br->levels[count] > max_level)
652  max_level = br->levels[count];
653  count++;
654  }
655 
656  /*
657  * some buggy BIOS don't export the levels
658  * when machine is on AC/Battery in _BCL package.
659  * In this case, the first two elements in _BCL packages
660  * are also supported brightness levels that OS should take care of.
661  */
662  for (i = 2; i < count; i++) {
663  if (br->levels[i] == br->levels[0])
664  level_ac_battery++;
665  if (br->levels[i] == br->levels[1])
666  level_ac_battery++;
667  }
668 
669  if (level_ac_battery < 2) {
670  level_ac_battery = 2 - level_ac_battery;
671  br->flags._BCL_no_ac_battery_levels = 1;
672  for (i = (count - 1 + level_ac_battery); i >= 2; i--)
673  br->levels[i] = br->levels[i - level_ac_battery];
674  count += level_ac_battery;
675  } else if (level_ac_battery > 2)
676  ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
677 
678  /* Check if the _BCL package is in a reversed order */
679  if (max_level == br->levels[2]) {
680  br->flags._BCL_reversed = 1;
681  sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
682  acpi_video_cmp_level, NULL);
683  } else if (max_level != br->levels[count - 1])
684  ACPI_ERROR((AE_INFO,
685  "Found unordered _BCL package\n"));
686 
687  br->count = count;
688  device->brightness = br;
689 
690  /* Check the input/output of _BQC/_BCL/_BCM */
691  if ((max_level < 100) && (max_level <= (count - 2)))
692  br->flags._BCL_use_index = 1;
693 
694  /*
695  * _BCM is always consistent with _BCL,
696  * at least for all the laptops we have ever seen.
697  */
698  br->flags._BCM_use_index = br->flags._BCL_use_index;
699 
700  /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
701  br->curr = level = max_level;
702 
703  if (!device->cap._BQC)
704  goto set_level;
705 
706  result = acpi_video_device_lcd_get_level_current(device, &level_old, 1);
707  if (result)
708  goto out_free_levels;
709 
710  /*
711  * Set the level to maximum and check if _BQC uses indexed value
712  */
713  result = acpi_video_device_lcd_set_level(device, max_level);
714  if (result)
715  goto out_free_levels;
716 
717  result = acpi_video_device_lcd_get_level_current(device, &level, 0);
718  if (result)
719  goto out_free_levels;
720 
721  br->flags._BQC_use_index = (level == max_level ? 0 : 1);
722 
723  if (!br->flags._BQC_use_index) {
724  /*
725  * Set the backlight to the initial state.
726  * On some buggy laptops, _BQC returns an uninitialized value
727  * when invoked for the first time, i.e. level_old is invalid.
728  * set the backlight to max_level in this case
729  */
730  if (use_bios_initial_backlight) {
731  for (i = 2; i < br->count; i++)
732  if (level_old == br->levels[i])
733  level = level_old;
734  }
735  goto set_level;
736  }
737 
738  if (br->flags._BCL_reversed)
739  level_old = (br->count - 1) - level_old;
740  level = br->levels[level_old];
741 
742 set_level:
743  result = acpi_video_device_lcd_set_level(device, level);
744  if (result)
745  goto out_free_levels;
746 
747  ACPI_DEBUG_PRINT((ACPI_DB_INFO,
748  "found %d brightness levels\n", count - 2));
749  kfree(obj);
750  return result;
751 
752 out_free_levels:
753  kfree(br->levels);
754 out_free:
755  kfree(br);
756 out:
757  device->brightness = NULL;
758  kfree(obj);
759  return result;
760 }
761 
762 /*
763  * Arg:
764  * device : video output device (LCD, CRT, ..)
765  *
766  * Return Value:
767  * None
768  *
769  * Find out all required AML methods defined under the output
770  * device.
771  */
772 
773 static void acpi_video_device_find_cap(struct acpi_video_device *device)
774 {
775  acpi_handle h_dummy1;
776 
777  if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
778  device->cap._ADR = 1;
779  }
780  if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
781  device->cap._BCL = 1;
782  }
783  if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
784  device->cap._BCM = 1;
785  }
786  if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
787  device->cap._BQC = 1;
788  else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
789  &h_dummy1))) {
790  printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
791  device->cap._BCQ = 1;
792  }
793 
794  if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
795  device->cap._DDC = 1;
796  }
797 
798  if (acpi_video_backlight_support()) {
799  struct backlight_properties props;
800  struct pci_dev *pdev;
801  acpi_handle acpi_parent;
802  struct device *parent = NULL;
803  int result;
804  static int count = 0;
805  char *name;
806 
807  result = acpi_video_init_brightness(device);
808  if (result)
809  return;
810  name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
811  if (!name)
812  return;
813  count++;
814 
815  acpi_get_parent(device->dev->handle, &acpi_parent);
816 
817  pdev = acpi_get_pci_dev(acpi_parent);
818  if (pdev) {
819  parent = &pdev->dev;
820  pci_dev_put(pdev);
821  }
822 
823  memset(&props, 0, sizeof(struct backlight_properties));
824  props.type = BACKLIGHT_FIRMWARE;
825  props.max_brightness = device->brightness->count - 3;
826  device->backlight = backlight_device_register(name,
827  parent,
828  device,
829  &acpi_backlight_ops,
830  &props);
831  kfree(name);
832  if (IS_ERR(device->backlight))
833  return;
834 
835  /*
836  * Save current brightness level in case we have to restore it
837  * before acpi_video_device_lcd_set_level() is called next time.
838  */
839  device->backlight->props.brightness =
840  acpi_video_get_brightness(device->backlight);
841 
842  device->cooling_dev = thermal_cooling_device_register("LCD",
843  device->dev, &video_cooling_ops);
844  if (IS_ERR(device->cooling_dev)) {
845  /*
846  * Set cooling_dev to NULL so we don't crash trying to
847  * free it.
848  * Also, why the hell we are returning early and
849  * not attempt to register video output if cooling
850  * device registration failed?
851  * -- dtor
852  */
853  device->cooling_dev = NULL;
854  return;
855  }
856 
857  dev_info(&device->dev->dev, "registered as cooling_device%d\n",
858  device->cooling_dev->id);
859  result = sysfs_create_link(&device->dev->dev.kobj,
860  &device->cooling_dev->device.kobj,
861  "thermal_cooling");
862  if (result)
863  printk(KERN_ERR PREFIX "Create sysfs link\n");
864  result = sysfs_create_link(&device->cooling_dev->device.kobj,
865  &device->dev->dev.kobj, "device");
866  if (result)
867  printk(KERN_ERR PREFIX "Create sysfs link\n");
868 
869  }
870 }
871 
872 /*
873  * Arg:
874  * device : video output device (VGA)
875  *
876  * Return Value:
877  * None
878  *
879  * Find out all required AML methods defined under the video bus device.
880  */
881 
882 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
883 {
884  acpi_handle h_dummy1;
885 
886  if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
887  video->cap._DOS = 1;
888  }
889  if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
890  video->cap._DOD = 1;
891  }
892  if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
893  video->cap._ROM = 1;
894  }
895  if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
896  video->cap._GPD = 1;
897  }
898  if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
899  video->cap._SPD = 1;
900  }
901  if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
902  video->cap._VPO = 1;
903  }
904 }
905 
906 /*
907  * Check whether the video bus device has required AML method to
908  * support the desired features
909  */
910 
911 static int acpi_video_bus_check(struct acpi_video_bus *video)
912 {
913  acpi_status status = -ENOENT;
914  struct pci_dev *dev;
915 
916  if (!video)
917  return -EINVAL;
918 
919  dev = acpi_get_pci_dev(video->device->handle);
920  if (!dev)
921  return -ENODEV;
922  pci_dev_put(dev);
923 
924  /* Since there is no HID, CID and so on for VGA driver, we have
925  * to check well known required nodes.
926  */
927 
928  /* Does this device support video switching? */
929  if (video->cap._DOS || video->cap._DOD) {
930  if (!video->cap._DOS) {
931  printk(KERN_WARNING FW_BUG
932  "ACPI(%s) defines _DOD but not _DOS\n",
933  acpi_device_bid(video->device));
934  }
935  video->flags.multihead = 1;
936  status = 0;
937  }
938 
939  /* Does this device support retrieving a video ROM? */
940  if (video->cap._ROM) {
941  video->flags.rom = 1;
942  status = 0;
943  }
944 
945  /* Does this device support configuring which video device to POST? */
946  if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
947  video->flags.post = 1;
948  status = 0;
949  }
950 
951  return status;
952 }
953 
954 /* --------------------------------------------------------------------------
955  Driver Interface
956  -------------------------------------------------------------------------- */
957 
958 /* device interface */
959 static struct acpi_video_device_attrib*
960 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
961 {
962  struct acpi_video_enumerated_device *ids;
963  int i;
964 
965  for (i = 0; i < video->attached_count; i++) {
966  ids = &video->attached_array[i];
967  if ((ids->value.int_val & 0xffff) == device_id)
968  return &ids->value.attrib;
969  }
970 
971  return NULL;
972 }
973 
974 static int
975 acpi_video_get_device_type(struct acpi_video_bus *video,
976  unsigned long device_id)
977 {
978  struct acpi_video_enumerated_device *ids;
979  int i;
980 
981  for (i = 0; i < video->attached_count; i++) {
982  ids = &video->attached_array[i];
983  if ((ids->value.int_val & 0xffff) == device_id)
984  return ids->value.int_val;
985  }
986 
987  return 0;
988 }
989 
990 static int
991 acpi_video_bus_get_one_device(struct acpi_device *device,
992  struct acpi_video_bus *video)
993 {
994  unsigned long long device_id;
995  int status, device_type;
996  struct acpi_video_device *data;
997  struct acpi_video_device_attrib* attribute;
998 
999  if (!device || !video)
1000  return -EINVAL;
1001 
1002  status =
1003  acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1004  if (ACPI_SUCCESS(status)) {
1005 
1006  data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1007  if (!data)
1008  return -ENOMEM;
1009 
1010  strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1011  strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1012  device->driver_data = data;
1013 
1014  data->device_id = device_id;
1015  data->video = video;
1016  data->dev = device;
1017 
1018  attribute = acpi_video_get_device_attr(video, device_id);
1019 
1020  if((attribute != NULL) && attribute->device_id_scheme) {
1021  switch (attribute->display_type) {
1022  case ACPI_VIDEO_DISPLAY_CRT:
1023  data->flags.crt = 1;
1024  break;
1025  case ACPI_VIDEO_DISPLAY_TV:
1026  data->flags.tvout = 1;
1027  break;
1028  case ACPI_VIDEO_DISPLAY_DVI:
1029  data->flags.dvi = 1;
1030  break;
1031  case ACPI_VIDEO_DISPLAY_LCD:
1032  data->flags.lcd = 1;
1033  break;
1034  default:
1035  data->flags.unknown = 1;
1036  break;
1037  }
1038  if(attribute->bios_can_detect)
1039  data->flags.bios = 1;
1040  } else {
1041  /* Check for legacy IDs */
1042  device_type = acpi_video_get_device_type(video,
1043  device_id);
1044  /* Ignore bits 16 and 18-20 */
1045  switch (device_type & 0xffe2ffff) {
1046  case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1047  data->flags.crt = 1;
1048  break;
1049  case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1050  data->flags.lcd = 1;
1051  break;
1052  case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1053  data->flags.tvout = 1;
1054  break;
1055  default:
1056  data->flags.unknown = 1;
1057  }
1058  }
1059 
1060  acpi_video_device_bind(video, data);
1061  acpi_video_device_find_cap(data);
1062 
1063  status = acpi_install_notify_handler(device->handle,
1064  ACPI_DEVICE_NOTIFY,
1065  acpi_video_device_notify,
1066  data);
1067  if (ACPI_FAILURE(status)) {
1068  printk(KERN_ERR PREFIX
1069  "Error installing notify handler\n");
1070  if(data->brightness)
1071  kfree(data->brightness->levels);
1072  kfree(data->brightness);
1073  kfree(data);
1074  return -ENODEV;
1075  }
1076 
1077  mutex_lock(&video->device_list_lock);
1078  list_add_tail(&data->entry, &video->video_device_list);
1079  mutex_unlock(&video->device_list_lock);
1080 
1081  return 0;
1082  }
1083 
1084  return -ENOENT;
1085 }
1086 
1087 /*
1088  * Arg:
1089  * video : video bus device
1090  *
1091  * Return:
1092  * none
1093  *
1094  * Enumerate the video device list of the video bus,
1095  * bind the ids with the corresponding video devices
1096  * under the video bus.
1097  */
1098 
1099 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1100 {
1101  struct acpi_video_device *dev;
1102 
1103  mutex_lock(&video->device_list_lock);
1104 
1105  list_for_each_entry(dev, &video->video_device_list, entry)
1106  acpi_video_device_bind(video, dev);
1107 
1108  mutex_unlock(&video->device_list_lock);
1109 }
1110 
1111 /*
1112  * Arg:
1113  * video : video bus device
1114  * device : video output device under the video
1115  * bus
1116  *
1117  * Return:
1118  * none
1119  *
1120  * Bind the ids with the corresponding video devices
1121  * under the video bus.
1122  */
1123 
1124 static void
1125 acpi_video_device_bind(struct acpi_video_bus *video,
1126  struct acpi_video_device *device)
1127 {
1128  struct acpi_video_enumerated_device *ids;
1129  int i;
1130 
1131  for (i = 0; i < video->attached_count; i++) {
1132  ids = &video->attached_array[i];
1133  if (device->device_id == (ids->value.int_val & 0xffff)) {
1134  ids->bind_info = device;
1135  ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1136  }
1137  }
1138 }
1139 
1140 /*
1141  * Arg:
1142  * video : video bus device
1143  *
1144  * Return:
1145  * < 0 : error
1146  *
1147  * Call _DOD to enumerate all devices attached to display adapter
1148  *
1149  */
1150 
1151 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1152 {
1153  int status;
1154  int count;
1155  int i;
1156  struct acpi_video_enumerated_device *active_list;
1157  struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1158  union acpi_object *dod = NULL;
1159  union acpi_object *obj;
1160 
1161  status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1162  if (!ACPI_SUCCESS(status)) {
1163  ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1164  return status;
1165  }
1166 
1167  dod = buffer.pointer;
1168  if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1169  ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1170  status = -EFAULT;
1171  goto out;
1172  }
1173 
1174  ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1175  dod->package.count));
1176 
1177  active_list = kcalloc(1 + dod->package.count,
1178  sizeof(struct acpi_video_enumerated_device),
1179  GFP_KERNEL);
1180  if (!active_list) {
1181  status = -ENOMEM;
1182  goto out;
1183  }
1184 
1185  count = 0;
1186  for (i = 0; i < dod->package.count; i++) {
1187  obj = &dod->package.elements[i];
1188 
1189  if (obj->type != ACPI_TYPE_INTEGER) {
1190  printk(KERN_ERR PREFIX
1191  "Invalid _DOD data in element %d\n", i);
1192  continue;
1193  }
1194 
1195  active_list[count].value.int_val = obj->integer.value;
1196  active_list[count].bind_info = NULL;
1197  ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1198  (int)obj->integer.value));
1199  count++;
1200  }
1201 
1202  kfree(video->attached_array);
1203 
1204  video->attached_array = active_list;
1205  video->attached_count = count;
1206 
1207  out:
1208  kfree(buffer.pointer);
1209  return status;
1210 }
1211 
1212 static int
1213 acpi_video_get_next_level(struct acpi_video_device *device,
1214  u32 level_current, u32 event)
1215 {
1216  int min, max, min_above, max_below, i, l, delta = 255;
1217  max = max_below = 0;
1218  min = min_above = 255;
1219  /* Find closest level to level_current */
1220  for (i = 2; i < device->brightness->count; i++) {
1221  l = device->brightness->levels[i];
1222  if (abs(l - level_current) < abs(delta)) {
1223  delta = l - level_current;
1224  if (!delta)
1225  break;
1226  }
1227  }
1228  /* Ajust level_current to closest available level */
1229  level_current += delta;
1230  for (i = 2; i < device->brightness->count; i++) {
1231  l = device->brightness->levels[i];
1232  if (l < min)
1233  min = l;
1234  if (l > max)
1235  max = l;
1236  if (l < min_above && l > level_current)
1237  min_above = l;
1238  if (l > max_below && l < level_current)
1239  max_below = l;
1240  }
1241 
1242  switch (event) {
1243  case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1244  return (level_current < max) ? min_above : min;
1245  case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1246  return (level_current < max) ? min_above : max;
1247  case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1248  return (level_current > min) ? max_below : min;
1249  case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1250  case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1251  return 0;
1252  default:
1253  return level_current;
1254  }
1255 }
1256 
1257 static int
1258 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1259 {
1260  unsigned long long level_current, level_next;
1261  int result = -EINVAL;
1262 
1263  /* no warning message if acpi_backlight=vendor is used */
1264  if (!acpi_video_backlight_support())
1265  return 0;
1266 
1267  if (!device->brightness)
1268  goto out;
1269 
1270  result = acpi_video_device_lcd_get_level_current(device,
1271  &level_current, 0);
1272  if (result)
1273  goto out;
1274 
1275  level_next = acpi_video_get_next_level(device, level_current, event);
1276 
1277  result = acpi_video_device_lcd_set_level(device, level_next);
1278 
1279  if (!result)
1280  backlight_force_update(device->backlight,
1281  BACKLIGHT_UPDATE_HOTKEY);
1282 
1283 out:
1284  if (result)
1285  printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1286 
1287  return result;
1288 }
1289 
1290 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1291  void **edid)
1292 {
1293  struct acpi_video_bus *video;
1294  struct acpi_video_device *video_device;
1295  union acpi_object *buffer = NULL;
1296  acpi_status status;
1297  int i, length;
1298 
1299  if (!device || !acpi_driver_data(device))
1300  return -EINVAL;
1301 
1302  video = acpi_driver_data(device);
1303 
1304  for (i = 0; i < video->attached_count; i++) {
1305  video_device = video->attached_array[i].bind_info;
1306  length = 256;
1307 
1308  if (!video_device)
1309  continue;
1310 
1311  if (!video_device->cap._DDC)
1312  continue;
1313 
1314  if (type) {
1315  switch (type) {
1316  case ACPI_VIDEO_DISPLAY_CRT:
1317  if (!video_device->flags.crt)
1318  continue;
1319  break;
1320  case ACPI_VIDEO_DISPLAY_TV:
1321  if (!video_device->flags.tvout)
1322  continue;
1323  break;
1324  case ACPI_VIDEO_DISPLAY_DVI:
1325  if (!video_device->flags.dvi)
1326  continue;
1327  break;
1328  case ACPI_VIDEO_DISPLAY_LCD:
1329  if (!video_device->flags.lcd)
1330  continue;
1331  break;
1332  }
1333  } else if (video_device->device_id != device_id) {
1334  continue;
1335  }
1336 
1337  status = acpi_video_device_EDID(video_device, &buffer, length);
1338 
1339  if (ACPI_FAILURE(status) || !buffer ||
1340  buffer->type != ACPI_TYPE_BUFFER) {
1341  length = 128;
1342  status = acpi_video_device_EDID(video_device, &buffer,
1343  length);
1344  if (ACPI_FAILURE(status) || !buffer ||
1345  buffer->type != ACPI_TYPE_BUFFER) {
1346  continue;
1347  }
1348  }
1349 
1350  *edid = buffer->buffer.pointer;
1351  return length;
1352  }
1353 
1354  return -ENODEV;
1355 }
1356 EXPORT_SYMBOL(acpi_video_get_edid);
1357 
1358 static int
1359 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1360  struct acpi_device *device)
1361 {
1362  int status = 0;
1363  struct acpi_device *dev;
1364 
1365  /*
1366  * There are systems where video module known to work fine regardless
1367  * of broken _DOD and ignoring returned value here doesn't cause
1368  * any issues later.
1369  */
1370  acpi_video_device_enumerate(video);
1371 
1372  list_for_each_entry(dev, &device->children, node) {
1373 
1374  status = acpi_video_bus_get_one_device(dev, video);
1375  if (status) {
1376  printk(KERN_WARNING PREFIX
1377  "Can't attach device\n");
1378  continue;
1379  }
1380  }
1381  return status;
1382 }
1383 
1384 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1385 {
1386  acpi_status status;
1387 
1388  if (!device || !device->video)
1389  return -ENOENT;
1390 
1391  status = acpi_remove_notify_handler(device->dev->handle,
1392  ACPI_DEVICE_NOTIFY,
1393  acpi_video_device_notify);
1394  if (ACPI_FAILURE(status)) {
1395  printk(KERN_WARNING PREFIX
1396  "Can't remove video notify handler\n");
1397  }
1398  if (device->backlight) {
1399  backlight_device_unregister(device->backlight);
1400  device->backlight = NULL;
1401  }
1402  if (device->cooling_dev) {
1403  sysfs_remove_link(&device->dev->dev.kobj,
1404  "thermal_cooling");
1405  sysfs_remove_link(&device->cooling_dev->device.kobj,
1406  "device");
1407  thermal_cooling_device_unregister(device->cooling_dev);
1408  device->cooling_dev = NULL;
1409  }
1410 
1411  return 0;
1412 }
1413 
1414 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1415 {
1416  int status;
1417  struct acpi_video_device *dev, *next;
1418 
1419  mutex_lock(&video->device_list_lock);
1420 
1421  list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1422 
1423  status = acpi_video_bus_put_one_device(dev);
1424  if (ACPI_FAILURE(status))
1425  printk(KERN_WARNING PREFIX
1426  "hhuuhhuu bug in acpi video driver.\n");
1427 
1428  if (dev->brightness) {
1429  kfree(dev->brightness->levels);
1430  kfree(dev->brightness);
1431  }
1432  list_del(&dev->entry);
1433  kfree(dev);
1434  }
1435 
1436  mutex_unlock(&video->device_list_lock);
1437 
1438  return 0;
1439 }
1440 
1441 /* acpi_video interface */
1442 
1443 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1444 {
1445  return acpi_video_bus_DOS(video, 0, 0);
1446 }
1447 
1448 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1449 {
1450  return acpi_video_bus_DOS(video, 0, 1);
1451 }
1452 
1453 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1454 {
1455  struct acpi_video_bus *video = acpi_driver_data(device);
1456  struct input_dev *input;
1457  int keycode = 0;
1458 
1459  if (!video)
1460  return;
1461 
1462  input = video->input;
1463 
1464  switch (event) {
1465  case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
1466  * most likely via hotkey. */
1467  acpi_bus_generate_proc_event(device, event, 0);
1468  keycode = KEY_SWITCHVIDEOMODE;
1469  break;
1470 
1471  case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
1472  * connector. */
1473  acpi_video_device_enumerate(video);
1474  acpi_video_device_rebind(video);
1475  acpi_bus_generate_proc_event(device, event, 0);
1476  keycode = KEY_SWITCHVIDEOMODE;
1477  break;
1478 
1479  case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
1480  acpi_bus_generate_proc_event(device, event, 0);
1481  keycode = KEY_SWITCHVIDEOMODE;
1482  break;
1483  case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
1484  acpi_bus_generate_proc_event(device, event, 0);
1485  keycode = KEY_VIDEO_NEXT;
1486  break;
1487  case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
1488  acpi_bus_generate_proc_event(device, event, 0);
1489  keycode = KEY_VIDEO_PREV;
1490  break;
1491 
1492  default:
1493  ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1494  "Unsupported event [0x%x]\n", event));
1495  break;
1496  }
1497 
1498  if (acpi_notifier_call_chain(device, event, 0))
1499  /* Something vetoed the keypress. */
1500  keycode = 0;
1501 
1502  if (keycode) {
1503  input_report_key(input, keycode, 1);
1504  input_sync(input);
1505  input_report_key(input, keycode, 0);
1506  input_sync(input);
1507  }
1508 
1509  return;
1510 }
1511 
1512 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1513 {
1514  struct acpi_video_device *video_device = data;
1515  struct acpi_device *device = NULL;
1516  struct acpi_video_bus *bus;
1517  struct input_dev *input;
1518  int keycode = 0;
1519 
1520  if (!video_device)
1521  return;
1522 
1523  device = video_device->dev;
1524  bus = video_device->video;
1525  input = bus->input;
1526 
1527  switch (event) {
1528  case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
1529  if (brightness_switch_enabled)
1530  acpi_video_switch_brightness(video_device, event);
1531  acpi_bus_generate_proc_event(device, event, 0);
1532  keycode = KEY_BRIGHTNESS_CYCLE;
1533  break;
1534  case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
1535  if (brightness_switch_enabled)
1536  acpi_video_switch_brightness(video_device, event);
1537  acpi_bus_generate_proc_event(device, event, 0);
1538  keycode = KEY_BRIGHTNESSUP;
1539  break;
1540  case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
1541  if (brightness_switch_enabled)
1542  acpi_video_switch_brightness(video_device, event);
1543  acpi_bus_generate_proc_event(device, event, 0);
1544  keycode = KEY_BRIGHTNESSDOWN;
1545  break;
1546  case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1547  if (brightness_switch_enabled)
1548  acpi_video_switch_brightness(video_device, event);
1549  acpi_bus_generate_proc_event(device, event, 0);
1550  keycode = KEY_BRIGHTNESS_ZERO;
1551  break;
1552  case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
1553  if (brightness_switch_enabled)
1554  acpi_video_switch_brightness(video_device, event);
1555  acpi_bus_generate_proc_event(device, event, 0);
1556  keycode = KEY_DISPLAY_OFF;
1557  break;
1558  default:
1559  ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1560  "Unsupported event [0x%x]\n", event));
1561  break;
1562  }
1563 
1564  acpi_notifier_call_chain(device, event, 0);
1565 
1566  if (keycode) {
1567  input_report_key(input, keycode, 1);
1568  input_sync(input);
1569  input_report_key(input, keycode, 0);
1570  input_sync(input);
1571  }
1572 
1573  return;
1574 }
1575 
1576 static int acpi_video_resume(struct notifier_block *nb,
1577  unsigned long val, void *ign)
1578 {
1579  struct acpi_video_bus *video;
1580  struct acpi_video_device *video_device;
1581  int i;
1582 
1583  switch (val) {
1584  case PM_HIBERNATION_PREPARE:
1585  case PM_SUSPEND_PREPARE:
1586  case PM_RESTORE_PREPARE:
1587  return NOTIFY_DONE;
1588  }
1589 
1590  video = container_of(nb, struct acpi_video_bus, pm_nb);
1591 
1592  dev_info(&video->device->dev, "Restoring backlight state\n");
1593 
1594  for (i = 0; i < video->attached_count; i++) {
1595  video_device = video->attached_array[i].bind_info;
1596  if (video_device && video_device->backlight)
1597  acpi_video_set_brightness(video_device->backlight);
1598  }
1599 
1600  return NOTIFY_OK;
1601 }
1602 
1603 static acpi_status
1604 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1605  void **return_value)
1606 {
1607  struct acpi_device *device = context;
1608  struct acpi_device *sibling;
1609  int result;
1610 
1611  if (handle == device->handle)
1612  return AE_CTRL_TERMINATE;
1613 
1614  result = acpi_bus_get_device(handle, &sibling);
1615  if (result)
1616  return AE_OK;
1617 
1618  if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1619  return AE_ALREADY_EXISTS;
1620 
1621  return AE_OK;
1622 }
1623 
1624 static int instance;
1625 
1626 static int acpi_video_bus_add(struct acpi_device *device)
1627 {
1628  struct acpi_video_bus *video;
1629  struct input_dev *input;
1630  int error;
1631  acpi_status status;
1632 
1633  status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1634  device->parent->handle, 1,
1635  acpi_video_bus_match, NULL,
1636  device, NULL);
1637  if (status == AE_ALREADY_EXISTS) {
1638  printk(KERN_WARNING FW_BUG
1639  "Duplicate ACPI video bus devices for the"
1640  " same VGA controller, please try module "
1641  "parameter \"video.allow_duplicates=1\""
1642  "if the current driver doesn't work.\n");
1643  if (!allow_duplicates)
1644  return -ENODEV;
1645  }
1646 
1647  video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1648  if (!video)
1649  return -ENOMEM;
1650 
1651  /* a hack to fix the duplicate name "VID" problem on T61 */
1652  if (!strcmp(device->pnp.bus_id, "VID")) {
1653  if (instance)
1654  device->pnp.bus_id[3] = '0' + instance;
1655  instance ++;
1656  }
1657  /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1658  if (!strcmp(device->pnp.bus_id, "VGA")) {
1659  if (instance)
1660  device->pnp.bus_id[3] = '0' + instance;
1661  instance++;
1662  }
1663 
1664  video->device = device;
1665  strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1666  strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1667  device->driver_data = video;
1668 
1669  acpi_video_bus_find_cap(video);
1670  error = acpi_video_bus_check(video);
1671  if (error)
1672  goto err_free_video;
1673 
1674  mutex_init(&video->device_list_lock);
1675  INIT_LIST_HEAD(&video->video_device_list);
1676 
1677  error = acpi_video_bus_get_devices(video, device);
1678  if (error)
1679  goto err_free_video;
1680 
1681  video->input = input = input_allocate_device();
1682  if (!input) {
1683  error = -ENOMEM;
1684  goto err_put_video;
1685  }
1686 
1687  error = acpi_video_bus_start_devices(video);
1688  if (error)
1689  goto err_free_input_dev;
1690 
1691  snprintf(video->phys, sizeof(video->phys),
1692  "%s/video/input0", acpi_device_hid(video->device));
1693 
1694  input->name = acpi_device_name(video->device);
1695  input->phys = video->phys;
1696  input->id.bustype = BUS_HOST;
1697  input->id.product = 0x06;
1698  input->dev.parent = &device->dev;
1699  input->evbit[0] = BIT(EV_KEY);
1700  set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1701  set_bit(KEY_VIDEO_NEXT, input->keybit);
1702  set_bit(KEY_VIDEO_PREV, input->keybit);
1703  set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1704  set_bit(KEY_BRIGHTNESSUP, input->keybit);
1705  set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1706  set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1707  set_bit(KEY_DISPLAY_OFF, input->keybit);
1708 
1709  printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
1710  ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1711  video->flags.multihead ? "yes" : "no",
1712  video->flags.rom ? "yes" : "no",
1713  video->flags.post ? "yes" : "no");
1714 
1715  video->pm_nb.notifier_call = acpi_video_resume;
1716  video->pm_nb.priority = 0;
1717  error = register_pm_notifier(&video->pm_nb);
1718  if (error)
1719  goto err_stop_video;
1720 
1721  error = input_register_device(input);
1722  if (error)
1723  goto err_unregister_pm_notifier;
1724 
1725  return 0;
1726 
1727  err_unregister_pm_notifier:
1728  unregister_pm_notifier(&video->pm_nb);
1729  err_stop_video:
1730  acpi_video_bus_stop_devices(video);
1731  err_free_input_dev:
1732  input_free_device(input);
1733  err_put_video:
1734  acpi_video_bus_put_devices(video);
1735  kfree(video->attached_array);
1736  err_free_video:
1737  kfree(video);
1738  device->driver_data = NULL;
1739 
1740  return error;
1741 }
1742 
1743 static int acpi_video_bus_remove(struct acpi_device *device, int type)
1744 {
1745  struct acpi_video_bus *video = NULL;
1746 
1747 
1748  if (!device || !acpi_driver_data(device))
1749  return -EINVAL;
1750 
1751  video = acpi_driver_data(device);
1752 
1753  unregister_pm_notifier(&video->pm_nb);
1754 
1755  acpi_video_bus_stop_devices(video);
1756  acpi_video_bus_put_devices(video);
1757 
1758  input_unregister_device(video->input);
1759  kfree(video->attached_array);
1760  kfree(video);
1761 
1762  return 0;
1763 }
1764 
1765 static int __init is_i740(struct pci_dev *dev)
1766 {
1767  if (dev->device == 0x00D1)
1768  return 1;
1769  if (dev->device == 0x7000)
1770  return 1;
1771  return 0;
1772 }
1773 
1774 static int __init intel_opregion_present(void)
1775 {
1776  int opregion = 0;
1777  struct pci_dev *dev = NULL;
1778  u32 address;
1779 
1780  for_each_pci_dev(dev) {
1781  if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1782  continue;
1783  if (dev->vendor != PCI_VENDOR_ID_INTEL)
1784  continue;
1785  /* We don't want to poke around undefined i740 registers */
1786  if (is_i740(dev))
1787  continue;
1788  pci_read_config_dword(dev, 0xfc, &address);
1789  if (!address)
1790  continue;
1791  opregion = 1;
1792  }
1793  return opregion;
1794 }
1795 
1796 int acpi_video_register(void)
1797 {
1798  int result = 0;
1799  if (register_count) {
1800  /*
1801  * if the function of acpi_video_register is already called,
1802  * don't register the acpi_vide_bus again and return no error.
1803  */
1804  return 0;
1805  }
1806 
1807  result = acpi_bus_register_driver(&acpi_video_bus);
1808  if (result < 0)
1809  return -ENODEV;
1810 
1811  /*
1812  * When the acpi_video_bus is loaded successfully, increase
1813  * the counter reference.
1814  */
1815  register_count = 1;
1816 
1817  return 0;
1818 }
1819 EXPORT_SYMBOL(acpi_video_register);
1820 
1821 void acpi_video_unregister(void)
1822 {
1823  if (!register_count) {
1824  /*
1825  * If the acpi video bus is already unloaded, don't
1826  * unload it again and return directly.
1827  */
1828  return;
1829  }
1830  acpi_bus_unregister_driver(&acpi_video_bus);
1831 
1832  register_count = 0;
1833 
1834  return;
1835 }
1836 EXPORT_SYMBOL(acpi_video_unregister);
1837 
1838 /*
1839  * This is kind of nasty. Hardware using Intel chipsets may require
1840  * the video opregion code to be run first in order to initialise
1841  * state before any ACPI video calls are made. To handle this we defer
1842  * registration of the video class until the opregion code has run.
1843  */
1844 
1845 static int __init acpi_video_init(void)
1846 {
1847  dmi_check_system(video_dmi_table);
1848 
1849  if (intel_opregion_present())
1850  return 0;
1851 
1852  return acpi_video_register();
1853 }
1854 
1855 static void __exit acpi_video_exit(void)
1856 {
1857  acpi_video_unregister();
1858 
1859  return;
1860 }
1861 
1862 module_init(acpi_video_init);
1863 module_exit(acpi_video_exit);
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