2 * video.c - ACPI Video Driver ($Revision:$)
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>
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.
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.
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.
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/types.h>
31 #include <linux/list.h>
32 #include <linux/mutex.h>
33 #include <linux/proc_fs.h>
34 #include <linux/seq_file.h>
35 #include <linux/input.h>
36 #include <linux/backlight.h>
37 #include <linux/thermal.h>
38 #include <linux/video_output.h>
39 #include <linux/sort.h>
40 #include <linux/pci.h>
41 #include <linux/pci_ids.h>
42 #include <linux/slab.h>
43 #include <asm/uaccess.h>
44 #include <linux/dmi.h>
45 #include <acpi/acpi_bus.h>
46 #include <acpi/acpi_drivers.h>
47 #include <linux/suspend.h>
48 #include <acpi/video.h>
50 #define PREFIX "ACPI: "
52 #define ACPI_VIDEO_CLASS "video"
53 #define ACPI_VIDEO_BUS_NAME "Video Bus"
54 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
55 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
56 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
57 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
58 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
59 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
61 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
62 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
63 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
64 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
65 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
67 #define MAX_NAME_LEN 20
69 #define _COMPONENT ACPI_VIDEO_COMPONENT
70 ACPI_MODULE_NAME("video");
72 MODULE_AUTHOR("Bruno Ducrot");
73 MODULE_DESCRIPTION("ACPI Video Driver");
74 MODULE_LICENSE("GPL");
76 static int brightness_switch_enabled = 1;
77 module_param(brightness_switch_enabled, bool, 0644);
80 * By default, we don't allow duplicate ACPI video bus devices
81 * under the same VGA controller
83 static int allow_duplicates;
84 module_param(allow_duplicates, bool, 0644);
86 static int register_count = 0;
87 static int acpi_video_bus_add(struct acpi_device *device);
88 static int acpi_video_bus_remove(struct acpi_device *device, int type);
89 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
91 static const struct acpi_device_id video_device_ids[] = {
95 MODULE_DEVICE_TABLE(acpi, video_device_ids);
97 static struct acpi_driver acpi_video_bus = {
99 .class = ACPI_VIDEO_CLASS,
100 .ids = video_device_ids,
102 .add = acpi_video_bus_add,
103 .remove = acpi_video_bus_remove,
104 .notify = acpi_video_bus_notify,
108 struct acpi_video_bus_flags {
109 u8 multihead:1; /* can switch video heads */
110 u8 rom:1; /* can retrieve a video rom */
111 u8 post:1; /* can configure the head to */
115 struct acpi_video_bus_cap {
116 u8 _DOS:1; /*Enable/Disable output switching */
117 u8 _DOD:1; /*Enumerate all devices attached to display adapter */
118 u8 _ROM:1; /*Get ROM Data */
119 u8 _GPD:1; /*Get POST Device */
120 u8 _SPD:1; /*Set POST Device */
121 u8 _VPO:1; /*Video POST Options */
125 struct acpi_video_device_attrib {
126 u32 display_index:4; /* A zero-based instance of the Display */
127 u32 display_port_attachment:4; /*This field differentiates the display type */
128 u32 display_type:4; /*Describe the specific type in use */
129 u32 vendor_specific:4; /*Chipset Vendor Specific */
130 u32 bios_can_detect:1; /*BIOS can detect the device */
131 u32 depend_on_vga:1; /*Non-VGA output device whose power is related to
133 u32 pipe_id:3; /*For VGA multiple-head devices. */
134 u32 reserved:10; /*Must be 0 */
135 u32 device_id_scheme:1; /*Device ID Scheme */
138 struct acpi_video_enumerated_device {
141 struct acpi_video_device_attrib attrib;
143 struct acpi_video_device *bind_info;
146 struct acpi_video_bus {
147 struct acpi_device *device;
149 struct acpi_video_enumerated_device *attached_array;
151 struct acpi_video_bus_cap cap;
152 struct acpi_video_bus_flags flags;
153 struct list_head video_device_list;
154 struct mutex device_list_lock; /* protects video_device_list */
155 struct proc_dir_entry *dir;
156 struct input_dev *input;
157 char phys[32]; /* for input device */
158 struct notifier_block pm_nb;
161 struct acpi_video_device_flags {
171 struct acpi_video_device_cap {
172 u8 _ADR:1; /*Return the unique ID */
173 u8 _BCL:1; /*Query list of brightness control levels supported */
174 u8 _BCM:1; /*Set the brightness level */
175 u8 _BQC:1; /* Get current brightness level */
176 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
177 u8 _DDC:1; /*Return the EDID for this device */
178 u8 _DCS:1; /*Return status of output device */
179 u8 _DGS:1; /*Query graphics state */
180 u8 _DSS:1; /*Device state set */
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 */
191 struct acpi_video_device_brightness {
195 struct acpi_video_brightness_flags flags;
198 struct acpi_video_device {
199 unsigned long device_id;
200 struct acpi_video_device_flags flags;
201 struct acpi_video_device_cap cap;
202 struct list_head entry;
203 struct acpi_video_bus *video;
204 struct acpi_device *dev;
205 struct acpi_video_device_brightness *brightness;
206 struct backlight_device *backlight;
207 struct thermal_cooling_device *cooling_dev;
208 struct output_device *output_dev;
212 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
213 static const struct file_operations acpi_video_bus_info_fops = {
214 .owner = THIS_MODULE,
215 .open = acpi_video_bus_info_open_fs,
218 .release = single_release,
221 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
222 static const struct file_operations acpi_video_bus_ROM_fops = {
223 .owner = THIS_MODULE,
224 .open = acpi_video_bus_ROM_open_fs,
227 .release = single_release,
230 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
232 static const struct file_operations acpi_video_bus_POST_info_fops = {
233 .owner = THIS_MODULE,
234 .open = acpi_video_bus_POST_info_open_fs,
237 .release = single_release,
240 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
241 static ssize_t acpi_video_bus_write_POST(struct file *file,
242 const char __user *buffer, size_t count, loff_t *data);
243 static const struct file_operations acpi_video_bus_POST_fops = {
244 .owner = THIS_MODULE,
245 .open = acpi_video_bus_POST_open_fs,
247 .write = acpi_video_bus_write_POST,
249 .release = single_release,
252 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
253 static ssize_t acpi_video_bus_write_DOS(struct file *file,
254 const char __user *buffer, size_t count, loff_t *data);
255 static const struct file_operations acpi_video_bus_DOS_fops = {
256 .owner = THIS_MODULE,
257 .open = acpi_video_bus_DOS_open_fs,
259 .write = acpi_video_bus_write_DOS,
261 .release = single_release,
265 static int acpi_video_device_info_open_fs(struct inode *inode,
267 static const struct file_operations acpi_video_device_info_fops = {
268 .owner = THIS_MODULE,
269 .open = acpi_video_device_info_open_fs,
272 .release = single_release,
275 static int acpi_video_device_state_open_fs(struct inode *inode,
277 static ssize_t acpi_video_device_write_state(struct file *file,
278 const char __user *buffer, size_t count, loff_t *data);
279 static const struct file_operations acpi_video_device_state_fops = {
280 .owner = THIS_MODULE,
281 .open = acpi_video_device_state_open_fs,
283 .write = acpi_video_device_write_state,
285 .release = single_release,
288 static int acpi_video_device_brightness_open_fs(struct inode *inode,
290 static ssize_t acpi_video_device_write_brightness(struct file *file,
291 const char __user *buffer, size_t count, loff_t *data);
292 static const struct file_operations acpi_video_device_brightness_fops = {
293 .owner = THIS_MODULE,
294 .open = acpi_video_device_brightness_open_fs,
296 .write = acpi_video_device_write_brightness,
298 .release = single_release,
301 static int acpi_video_device_EDID_open_fs(struct inode *inode,
303 static const struct file_operations acpi_video_device_EDID_fops = {
304 .owner = THIS_MODULE,
305 .open = acpi_video_device_EDID_open_fs,
308 .release = single_release,
311 static const char device_decode[][30] = {
312 "motherboard VGA device",
318 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
319 static void acpi_video_device_rebind(struct acpi_video_bus *video);
320 static void acpi_video_device_bind(struct acpi_video_bus *video,
321 struct acpi_video_device *device);
322 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
323 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
325 static int acpi_video_device_lcd_get_level_current(
326 struct acpi_video_device *device,
327 unsigned long long *level, int init);
328 static int acpi_video_get_next_level(struct acpi_video_device *device,
329 u32 level_current, u32 event);
330 static int acpi_video_switch_brightness(struct acpi_video_device *device,
332 static int acpi_video_device_get_state(struct acpi_video_device *device,
333 unsigned long long *state);
334 static int acpi_video_output_get(struct output_device *od);
335 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
337 /*backlight device sysfs support*/
338 static int acpi_video_get_brightness(struct backlight_device *bd)
340 unsigned long long cur_level;
342 struct acpi_video_device *vd =
343 (struct acpi_video_device *)bl_get_data(bd);
345 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, 0))
347 for (i = 2; i < vd->brightness->count; i++) {
348 if (vd->brightness->levels[i] == cur_level)
349 /* The first two entries are special - see page 575
350 of the ACPI spec 3.0 */
356 static int acpi_video_set_brightness(struct backlight_device *bd)
358 int request_level = bd->props.brightness + 2;
359 struct acpi_video_device *vd =
360 (struct acpi_video_device *)bl_get_data(bd);
362 return acpi_video_device_lcd_set_level(vd,
363 vd->brightness->levels[request_level]);
366 static struct backlight_ops acpi_backlight_ops = {
367 .get_brightness = acpi_video_get_brightness,
368 .update_status = acpi_video_set_brightness,
371 /*video output device sysfs support*/
372 static int acpi_video_output_get(struct output_device *od)
374 unsigned long long state;
375 struct acpi_video_device *vd =
376 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
377 acpi_video_device_get_state(vd, &state);
381 static int acpi_video_output_set(struct output_device *od)
383 unsigned long state = od->request_state;
384 struct acpi_video_device *vd=
385 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
386 return acpi_video_device_set_state(vd, state);
389 static struct output_properties acpi_output_properties = {
390 .set_state = acpi_video_output_set,
391 .get_status = acpi_video_output_get,
395 /* thermal cooling device callbacks */
396 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
399 struct acpi_device *device = cooling_dev->devdata;
400 struct acpi_video_device *video = acpi_driver_data(device);
402 *state = video->brightness->count - 3;
406 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
409 struct acpi_device *device = cooling_dev->devdata;
410 struct acpi_video_device *video = acpi_driver_data(device);
411 unsigned long long level;
414 if (acpi_video_device_lcd_get_level_current(video, &level, 0))
416 for (offset = 2; offset < video->brightness->count; offset++)
417 if (level == video->brightness->levels[offset]) {
418 *state = video->brightness->count - offset - 1;
426 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
428 struct acpi_device *device = cooling_dev->devdata;
429 struct acpi_video_device *video = acpi_driver_data(device);
432 if ( state >= video->brightness->count - 2)
435 state = video->brightness->count - state;
436 level = video->brightness->levels[state -1];
437 return acpi_video_device_lcd_set_level(video, level);
440 static struct thermal_cooling_device_ops video_cooling_ops = {
441 .get_max_state = video_get_max_state,
442 .get_cur_state = video_get_cur_state,
443 .set_cur_state = video_set_cur_state,
446 /* --------------------------------------------------------------------------
448 -------------------------------------------------------------------------- */
453 acpi_video_device_query(struct acpi_video_device *device, unsigned long long *state)
457 status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
463 acpi_video_device_get_state(struct acpi_video_device *device,
464 unsigned long long *state)
468 status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
474 acpi_video_device_set_state(struct acpi_video_device *device, int state)
477 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
478 struct acpi_object_list args = { 1, &arg0 };
479 unsigned long long ret;
482 arg0.integer.value = state;
483 status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
489 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
490 union acpi_object **levels)
493 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
494 union acpi_object *obj;
499 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
500 if (!ACPI_SUCCESS(status))
502 obj = (union acpi_object *)buffer.pointer;
503 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
504 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
514 kfree(buffer.pointer);
520 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
523 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
524 struct acpi_object_list args = { 1, &arg0 };
527 arg0.integer.value = level;
529 status = acpi_evaluate_object(device->dev->handle, "_BCM",
531 if (ACPI_FAILURE(status)) {
532 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
536 device->brightness->curr = level;
537 for (state = 2; state < device->brightness->count; state++)
538 if (level == device->brightness->levels[state]) {
539 if (device->backlight)
540 device->backlight->props.brightness = state - 2;
544 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
549 * For some buggy _BQC methods, we need to add a constant value to
550 * the _BQC return value to get the actual current brightness level
553 static int bqc_offset_aml_bug_workaround;
554 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
556 bqc_offset_aml_bug_workaround = 9;
560 static struct dmi_system_id video_dmi_table[] __initdata = {
562 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
565 .callback = video_set_bqc_offset,
566 .ident = "Acer Aspire 5720",
568 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
569 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
573 .callback = video_set_bqc_offset,
574 .ident = "Acer Aspire 5710Z",
576 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
577 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
581 .callback = video_set_bqc_offset,
582 .ident = "eMachines E510",
584 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
585 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
589 .callback = video_set_bqc_offset,
590 .ident = "Acer Aspire 5315",
592 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
593 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
597 .callback = video_set_bqc_offset,
598 .ident = "Acer Aspire 7720",
600 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
601 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
608 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
609 unsigned long long *level, int init)
611 acpi_status status = AE_OK;
614 if (device->cap._BQC || device->cap._BCQ) {
615 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
617 status = acpi_evaluate_integer(device->dev->handle, buf,
619 if (ACPI_SUCCESS(status)) {
620 if (device->brightness->flags._BQC_use_index) {
621 if (device->brightness->flags._BCL_reversed)
622 *level = device->brightness->count
624 *level = device->brightness->levels[*level + 2];
627 *level += bqc_offset_aml_bug_workaround;
628 for (i = 2; i < device->brightness->count; i++)
629 if (device->brightness->levels[i] == *level) {
630 device->brightness->curr = *level;
635 * BQC returned an invalid level.
638 ACPI_WARNING((AE_INFO,
639 "%s returned an invalid level",
641 device->cap._BQC = device->cap._BCQ = 0;
645 * should we return an error or ignore this failure?
646 * dev->brightness->curr is a cached value which stores
647 * the correct current backlight level in most cases.
648 * ACPI video backlight still works w/ buggy _BQC.
649 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
651 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
652 device->cap._BQC = device->cap._BCQ = 0;
656 *level = device->brightness->curr;
661 acpi_video_device_EDID(struct acpi_video_device *device,
662 union acpi_object **edid, ssize_t length)
665 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
666 union acpi_object *obj;
667 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
668 struct acpi_object_list args = { 1, &arg0 };
676 arg0.integer.value = 1;
677 else if (length == 256)
678 arg0.integer.value = 2;
682 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
683 if (ACPI_FAILURE(status))
686 obj = buffer.pointer;
688 if (obj && obj->type == ACPI_TYPE_BUFFER)
691 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
702 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
705 unsigned long long tmp;
706 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
707 struct acpi_object_list args = { 1, &arg0 };
710 arg0.integer.value = option;
712 status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
713 if (ACPI_SUCCESS(status))
714 status = tmp ? (-EINVAL) : (AE_OK);
720 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long long *id)
724 status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
730 acpi_video_bus_POST_options(struct acpi_video_bus *video,
731 unsigned long long *options)
735 status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
743 * video : video bus device pointer
745 * 0. The system BIOS should NOT automatically switch(toggle)
746 * the active display output.
747 * 1. The system BIOS should automatically switch (toggle) the
748 * active display output. No switch event.
749 * 2. The _DGS value should be locked.
750 * 3. The system BIOS should not automatically switch (toggle) the
751 * active display output, but instead generate the display switch
754 * 0. The system BIOS should automatically control the brightness level
755 * of the LCD when the power changes from AC to DC
756 * 1. The system BIOS should NOT automatically control the brightness
757 * level of the LCD when the power changes from AC to DC.
763 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
766 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
767 struct acpi_object_list args = { 1, &arg0 };
770 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
774 arg0.integer.value = (lcd_flag << 2) | bios_flag;
775 video->dos_setting = arg0.integer.value;
776 acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
783 * Simple comparison function used to sort backlight levels.
787 acpi_video_cmp_level(const void *a, const void *b)
789 return *(int *)a - *(int *)b;
794 * device : video output device (LCD, CRT, ..)
797 * Maximum brightness level
799 * Allocate and initialize device->brightness.
803 acpi_video_init_brightness(struct acpi_video_device *device)
805 union acpi_object *obj = NULL;
806 int i, max_level = 0, count = 0, level_ac_battery = 0;
807 unsigned long long level, level_old;
808 union acpi_object *o;
809 struct acpi_video_device_brightness *br = NULL;
810 int result = -EINVAL;
812 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
813 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
814 "LCD brightness level\n"));
818 if (obj->package.count < 2)
821 br = kzalloc(sizeof(*br), GFP_KERNEL);
823 printk(KERN_ERR "can't allocate memory\n");
828 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
835 for (i = 0; i < obj->package.count; i++) {
836 o = (union acpi_object *)&obj->package.elements[i];
837 if (o->type != ACPI_TYPE_INTEGER) {
838 printk(KERN_ERR PREFIX "Invalid data\n");
841 br->levels[count] = (u32) o->integer.value;
843 if (br->levels[count] > max_level)
844 max_level = br->levels[count];
849 * some buggy BIOS don't export the levels
850 * when machine is on AC/Battery in _BCL package.
851 * In this case, the first two elements in _BCL packages
852 * are also supported brightness levels that OS should take care of.
854 for (i = 2; i < count; i++) {
855 if (br->levels[i] == br->levels[0])
857 if (br->levels[i] == br->levels[1])
861 if (level_ac_battery < 2) {
862 level_ac_battery = 2 - level_ac_battery;
863 br->flags._BCL_no_ac_battery_levels = 1;
864 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
865 br->levels[i] = br->levels[i - level_ac_battery];
866 count += level_ac_battery;
867 } else if (level_ac_battery > 2)
868 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
870 /* Check if the _BCL package is in a reversed order */
871 if (max_level == br->levels[2]) {
872 br->flags._BCL_reversed = 1;
873 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
874 acpi_video_cmp_level, NULL);
875 } else if (max_level != br->levels[count - 1])
877 "Found unordered _BCL package\n"));
880 device->brightness = br;
882 /* Check the input/output of _BQC/_BCL/_BCM */
883 if ((max_level < 100) && (max_level <= (count - 2)))
884 br->flags._BCL_use_index = 1;
887 * _BCM is always consistent with _BCL,
888 * at least for all the laptops we have ever seen.
890 br->flags._BCM_use_index = br->flags._BCL_use_index;
892 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
893 br->curr = level = max_level;
895 if (!device->cap._BQC)
898 result = acpi_video_device_lcd_get_level_current(device, &level_old, 1);
900 goto out_free_levels;
903 * Set the level to maximum and check if _BQC uses indexed value
905 result = acpi_video_device_lcd_set_level(device, max_level);
907 goto out_free_levels;
909 result = acpi_video_device_lcd_get_level_current(device, &level, 0);
911 goto out_free_levels;
913 br->flags._BQC_use_index = (level == max_level ? 0 : 1);
915 if (!br->flags._BQC_use_index) {
917 * Set the backlight to the initial state.
918 * On some buggy laptops, _BQC returns an uninitialized value
919 * when invoked for the first time, i.e. level_old is invalid.
920 * set the backlight to max_level in this case
922 for (i = 2; i < br->count; i++)
923 if (level_old == br->levels[i])
928 if (br->flags._BCL_reversed)
929 level_old = (br->count - 1) - level_old;
930 level = br->levels[level_old];
933 result = acpi_video_device_lcd_set_level(device, level);
935 goto out_free_levels;
937 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
938 "found %d brightness levels\n", count - 2));
947 device->brightness = NULL;
954 * device : video output device (LCD, CRT, ..)
959 * Find out all required AML methods defined under the output
963 static void acpi_video_device_find_cap(struct acpi_video_device *device)
965 acpi_handle h_dummy1;
967 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
968 device->cap._ADR = 1;
970 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
971 device->cap._BCL = 1;
973 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
974 device->cap._BCM = 1;
976 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
977 device->cap._BQC = 1;
978 else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
980 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
981 device->cap._BCQ = 1;
984 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
985 device->cap._DDC = 1;
987 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
988 device->cap._DCS = 1;
990 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
991 device->cap._DGS = 1;
993 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
994 device->cap._DSS = 1;
997 if (acpi_video_backlight_support()) {
998 struct backlight_properties props;
1000 static int count = 0;
1003 result = acpi_video_init_brightness(device);
1006 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1011 memset(&props, 0, sizeof(struct backlight_properties));
1012 props.max_brightness = device->brightness->count - 3;
1013 device->backlight = backlight_device_register(name, NULL, device,
1014 &acpi_backlight_ops,
1017 if (IS_ERR(device->backlight))
1021 * Save current brightness level in case we have to restore it
1022 * before acpi_video_device_lcd_set_level() is called next time.
1024 device->backlight->props.brightness =
1025 acpi_video_get_brightness(device->backlight);
1027 result = sysfs_create_link(&device->backlight->dev.kobj,
1028 &device->dev->dev.kobj, "device");
1030 printk(KERN_ERR PREFIX "Create sysfs link\n");
1032 device->cooling_dev = thermal_cooling_device_register("LCD",
1033 device->dev, &video_cooling_ops);
1034 if (IS_ERR(device->cooling_dev)) {
1036 * Set cooling_dev to NULL so we don't crash trying to
1038 * Also, why the hell we are returning early and
1039 * not attempt to register video output if cooling
1040 * device registration failed?
1043 device->cooling_dev = NULL;
1047 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1048 device->cooling_dev->id);
1049 result = sysfs_create_link(&device->dev->dev.kobj,
1050 &device->cooling_dev->device.kobj,
1053 printk(KERN_ERR PREFIX "Create sysfs link\n");
1054 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1055 &device->dev->dev.kobj, "device");
1057 printk(KERN_ERR PREFIX "Create sysfs link\n");
1061 if (acpi_video_display_switch_support()) {
1063 if (device->cap._DCS && device->cap._DSS) {
1066 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1070 device->output_dev = video_output_register(name,
1071 NULL, device, &acpi_output_properties);
1079 * device : video output device (VGA)
1084 * Find out all required AML methods defined under the video bus device.
1087 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1089 acpi_handle h_dummy1;
1091 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
1092 video->cap._DOS = 1;
1094 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
1095 video->cap._DOD = 1;
1097 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
1098 video->cap._ROM = 1;
1100 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
1101 video->cap._GPD = 1;
1103 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
1104 video->cap._SPD = 1;
1106 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
1107 video->cap._VPO = 1;
1112 * Check whether the video bus device has required AML method to
1113 * support the desired features
1116 static int acpi_video_bus_check(struct acpi_video_bus *video)
1118 acpi_status status = -ENOENT;
1119 struct pci_dev *dev;
1124 dev = acpi_get_pci_dev(video->device->handle);
1129 /* Since there is no HID, CID and so on for VGA driver, we have
1130 * to check well known required nodes.
1133 /* Does this device support video switching? */
1134 if (video->cap._DOS || video->cap._DOD) {
1135 if (!video->cap._DOS) {
1136 printk(KERN_WARNING FW_BUG
1137 "ACPI(%s) defines _DOD but not _DOS\n",
1138 acpi_device_bid(video->device));
1140 video->flags.multihead = 1;
1144 /* Does this device support retrieving a video ROM? */
1145 if (video->cap._ROM) {
1146 video->flags.rom = 1;
1150 /* Does this device support configuring which video device to POST? */
1151 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1152 video->flags.post = 1;
1159 /* --------------------------------------------------------------------------
1160 FS Interface (/proc)
1161 -------------------------------------------------------------------------- */
1163 static struct proc_dir_entry *acpi_video_dir;
1167 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
1169 struct acpi_video_device *dev = seq->private;
1175 seq_printf(seq, "device_id: 0x%04x\n", (u32) dev->device_id);
1176 seq_printf(seq, "type: ");
1178 seq_printf(seq, "CRT\n");
1179 else if (dev->flags.lcd)
1180 seq_printf(seq, "LCD\n");
1181 else if (dev->flags.tvout)
1182 seq_printf(seq, "TVOUT\n");
1183 else if (dev->flags.dvi)
1184 seq_printf(seq, "DVI\n");
1186 seq_printf(seq, "UNKNOWN\n");
1188 seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
1195 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
1197 return single_open(file, acpi_video_device_info_seq_show,
1201 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
1204 struct acpi_video_device *dev = seq->private;
1205 unsigned long long state;
1211 status = acpi_video_device_get_state(dev, &state);
1212 seq_printf(seq, "state: ");
1213 if (ACPI_SUCCESS(status))
1214 seq_printf(seq, "0x%02llx\n", state);
1216 seq_printf(seq, "<not supported>\n");
1218 status = acpi_video_device_query(dev, &state);
1219 seq_printf(seq, "query: ");
1220 if (ACPI_SUCCESS(status))
1221 seq_printf(seq, "0x%02llx\n", state);
1223 seq_printf(seq, "<not supported>\n");
1230 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
1232 return single_open(file, acpi_video_device_state_seq_show,
1237 acpi_video_device_write_state(struct file *file,
1238 const char __user * buffer,
1239 size_t count, loff_t * data)
1242 struct seq_file *m = file->private_data;
1243 struct acpi_video_device *dev = m->private;
1244 char str[12] = { 0 };
1248 if (!dev || count >= sizeof(str))
1251 if (copy_from_user(str, buffer, count))
1255 state = simple_strtoul(str, NULL, 0);
1256 state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
1258 status = acpi_video_device_set_state(dev, state);
1267 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
1269 struct acpi_video_device *dev = seq->private;
1273 if (!dev || !dev->brightness) {
1274 seq_printf(seq, "<not supported>\n");
1278 seq_printf(seq, "levels: ");
1279 for (i = 2; i < dev->brightness->count; i++)
1280 seq_printf(seq, " %d", dev->brightness->levels[i]);
1281 seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
1287 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1289 return single_open(file, acpi_video_device_brightness_seq_show,
1294 acpi_video_device_write_brightness(struct file *file,
1295 const char __user * buffer,
1296 size_t count, loff_t * data)
1298 struct seq_file *m = file->private_data;
1299 struct acpi_video_device *dev = m->private;
1300 char str[5] = { 0 };
1301 unsigned int level = 0;
1305 if (!dev || !dev->brightness || count >= sizeof(str))
1308 if (copy_from_user(str, buffer, count))
1312 level = simple_strtoul(str, NULL, 0);
1317 /* validate through the list of available levels */
1318 for (i = 2; i < dev->brightness->count; i++)
1319 if (level == dev->brightness->levels[i]) {
1320 if (!acpi_video_device_lcd_set_level(dev, level))
1328 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1330 struct acpi_video_device *dev = seq->private;
1333 union acpi_object *edid = NULL;
1339 status = acpi_video_device_EDID(dev, &edid, 128);
1340 if (ACPI_FAILURE(status)) {
1341 status = acpi_video_device_EDID(dev, &edid, 256);
1344 if (ACPI_FAILURE(status)) {
1348 if (edid && edid->type == ACPI_TYPE_BUFFER) {
1349 for (i = 0; i < edid->buffer.length; i++)
1350 seq_putc(seq, edid->buffer.pointer[i]);
1355 seq_printf(seq, "<not supported>\n");
1363 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1365 return single_open(file, acpi_video_device_EDID_seq_show,
1369 static int acpi_video_device_add_fs(struct acpi_device *device)
1371 struct proc_dir_entry *entry, *device_dir;
1372 struct acpi_video_device *vid_dev;
1374 vid_dev = acpi_driver_data(device);
1378 device_dir = proc_mkdir(acpi_device_bid(device),
1379 vid_dev->video->dir);
1384 entry = proc_create_data("info", S_IRUGO, device_dir,
1385 &acpi_video_device_info_fops, acpi_driver_data(device));
1387 goto err_remove_dir;
1390 entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1392 &acpi_video_device_state_fops,
1393 acpi_driver_data(device));
1395 goto err_remove_info;
1397 /* 'brightness' [R/W] */
1398 entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1400 &acpi_video_device_brightness_fops,
1401 acpi_driver_data(device));
1403 goto err_remove_state;
1406 entry = proc_create_data("EDID", S_IRUGO, device_dir,
1407 &acpi_video_device_EDID_fops,
1408 acpi_driver_data(device));
1410 goto err_remove_brightness;
1412 acpi_device_dir(device) = device_dir;
1416 err_remove_brightness:
1417 remove_proc_entry("brightness", device_dir);
1419 remove_proc_entry("state", device_dir);
1421 remove_proc_entry("info", device_dir);
1423 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1427 static int acpi_video_device_remove_fs(struct acpi_device *device)
1429 struct acpi_video_device *vid_dev;
1430 struct proc_dir_entry *device_dir;
1432 vid_dev = acpi_driver_data(device);
1433 if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1436 device_dir = acpi_device_dir(device);
1438 remove_proc_entry("info", device_dir);
1439 remove_proc_entry("state", device_dir);
1440 remove_proc_entry("brightness", device_dir);
1441 remove_proc_entry("EDID", device_dir);
1442 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1443 acpi_device_dir(device) = NULL;
1450 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1452 struct acpi_video_bus *video = seq->private;
1458 seq_printf(seq, "Switching heads: %s\n",
1459 video->flags.multihead ? "yes" : "no");
1460 seq_printf(seq, "Video ROM: %s\n",
1461 video->flags.rom ? "yes" : "no");
1462 seq_printf(seq, "Device to be POSTed on boot: %s\n",
1463 video->flags.post ? "yes" : "no");
1469 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1471 return single_open(file, acpi_video_bus_info_seq_show,
1475 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1477 struct acpi_video_bus *video = seq->private;
1483 printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1484 seq_printf(seq, "<TODO>\n");
1490 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1492 return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1495 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1497 struct acpi_video_bus *video = seq->private;
1498 unsigned long long options;
1505 status = acpi_video_bus_POST_options(video, &options);
1506 if (ACPI_SUCCESS(status)) {
1507 if (!(options & 1)) {
1508 printk(KERN_WARNING PREFIX
1509 "The motherboard VGA device is not listed as a possible POST device.\n");
1510 printk(KERN_WARNING PREFIX
1511 "This indicates a BIOS bug. Please contact the manufacturer.\n");
1513 printk(KERN_WARNING "%llx\n", options);
1514 seq_printf(seq, "can POST: <integrated video>");
1516 seq_printf(seq, " <PCI video>");
1518 seq_printf(seq, " <AGP video>");
1519 seq_putc(seq, '\n');
1521 seq_printf(seq, "<not supported>\n");
1527 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1529 return single_open(file, acpi_video_bus_POST_info_seq_show,
1533 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1535 struct acpi_video_bus *video = seq->private;
1537 unsigned long long id;
1543 status = acpi_video_bus_get_POST(video, &id);
1544 if (!ACPI_SUCCESS(status)) {
1545 seq_printf(seq, "<not supported>\n");
1548 seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1554 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1556 struct acpi_video_bus *video = seq->private;
1559 seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1564 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1566 return single_open(file, acpi_video_bus_POST_seq_show,
1570 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1572 return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1576 acpi_video_bus_write_POST(struct file *file,
1577 const char __user * buffer,
1578 size_t count, loff_t * data)
1581 struct seq_file *m = file->private_data;
1582 struct acpi_video_bus *video = m->private;
1583 char str[12] = { 0 };
1584 unsigned long long opt, options;
1587 if (!video || count >= sizeof(str))
1590 status = acpi_video_bus_POST_options(video, &options);
1591 if (!ACPI_SUCCESS(status))
1594 if (copy_from_user(str, buffer, count))
1598 opt = strtoul(str, NULL, 0);
1602 /* just in case an OEM 'forgot' the motherboard... */
1605 if (options & (1ul << opt)) {
1606 status = acpi_video_bus_set_POST(video, opt);
1607 if (!ACPI_SUCCESS(status))
1616 acpi_video_bus_write_DOS(struct file *file,
1617 const char __user * buffer,
1618 size_t count, loff_t * data)
1621 struct seq_file *m = file->private_data;
1622 struct acpi_video_bus *video = m->private;
1623 char str[12] = { 0 };
1627 if (!video || count >= sizeof(str))
1630 if (copy_from_user(str, buffer, count))
1634 opt = strtoul(str, NULL, 0);
1638 status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1640 if (!ACPI_SUCCESS(status))
1646 static int acpi_video_bus_add_fs(struct acpi_device *device)
1648 struct acpi_video_bus *video = acpi_driver_data(device);
1649 struct proc_dir_entry *device_dir;
1650 struct proc_dir_entry *entry;
1652 device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1657 entry = proc_create_data("info", S_IRUGO, device_dir,
1658 &acpi_video_bus_info_fops,
1659 acpi_driver_data(device));
1661 goto err_remove_dir;
1664 entry = proc_create_data("ROM", S_IRUGO, device_dir,
1665 &acpi_video_bus_ROM_fops,
1666 acpi_driver_data(device));
1668 goto err_remove_info;
1670 /* 'POST_info' [R] */
1671 entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1672 &acpi_video_bus_POST_info_fops,
1673 acpi_driver_data(device));
1675 goto err_remove_rom;
1678 entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1680 &acpi_video_bus_POST_fops,
1681 acpi_driver_data(device));
1683 goto err_remove_post_info;
1686 entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1688 &acpi_video_bus_DOS_fops,
1689 acpi_driver_data(device));
1691 goto err_remove_post;
1693 video->dir = acpi_device_dir(device) = device_dir;
1697 remove_proc_entry("POST", device_dir);
1698 err_remove_post_info:
1699 remove_proc_entry("POST_info", device_dir);
1701 remove_proc_entry("ROM", device_dir);
1703 remove_proc_entry("info", device_dir);
1705 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1709 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1711 struct proc_dir_entry *device_dir = acpi_device_dir(device);
1714 remove_proc_entry("info", device_dir);
1715 remove_proc_entry("ROM", device_dir);
1716 remove_proc_entry("POST_info", device_dir);
1717 remove_proc_entry("POST", device_dir);
1718 remove_proc_entry("DOS", device_dir);
1719 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1720 acpi_device_dir(device) = NULL;
1726 /* --------------------------------------------------------------------------
1728 -------------------------------------------------------------------------- */
1730 /* device interface */
1731 static struct acpi_video_device_attrib*
1732 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1734 struct acpi_video_enumerated_device *ids;
1737 for (i = 0; i < video->attached_count; i++) {
1738 ids = &video->attached_array[i];
1739 if ((ids->value.int_val & 0xffff) == device_id)
1740 return &ids->value.attrib;
1747 acpi_video_get_device_type(struct acpi_video_bus *video,
1748 unsigned long device_id)
1750 struct acpi_video_enumerated_device *ids;
1753 for (i = 0; i < video->attached_count; i++) {
1754 ids = &video->attached_array[i];
1755 if ((ids->value.int_val & 0xffff) == device_id)
1756 return ids->value.int_val;
1763 acpi_video_bus_get_one_device(struct acpi_device *device,
1764 struct acpi_video_bus *video)
1766 unsigned long long device_id;
1767 int status, device_type;
1768 struct acpi_video_device *data;
1769 struct acpi_video_device_attrib* attribute;
1771 if (!device || !video)
1775 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1776 if (ACPI_SUCCESS(status)) {
1778 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1782 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1783 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1784 device->driver_data = data;
1786 data->device_id = device_id;
1787 data->video = video;
1790 attribute = acpi_video_get_device_attr(video, device_id);
1792 if((attribute != NULL) && attribute->device_id_scheme) {
1793 switch (attribute->display_type) {
1794 case ACPI_VIDEO_DISPLAY_CRT:
1795 data->flags.crt = 1;
1797 case ACPI_VIDEO_DISPLAY_TV:
1798 data->flags.tvout = 1;
1800 case ACPI_VIDEO_DISPLAY_DVI:
1801 data->flags.dvi = 1;
1803 case ACPI_VIDEO_DISPLAY_LCD:
1804 data->flags.lcd = 1;
1807 data->flags.unknown = 1;
1810 if(attribute->bios_can_detect)
1811 data->flags.bios = 1;
1813 /* Check for legacy IDs */
1814 device_type = acpi_video_get_device_type(video,
1816 /* Ignore bits 16 and 18-20 */
1817 switch (device_type & 0xffe2ffff) {
1818 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1819 data->flags.crt = 1;
1821 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1822 data->flags.lcd = 1;
1824 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1825 data->flags.tvout = 1;
1828 data->flags.unknown = 1;
1832 acpi_video_device_bind(video, data);
1833 acpi_video_device_find_cap(data);
1835 status = acpi_install_notify_handler(device->handle,
1837 acpi_video_device_notify,
1839 if (ACPI_FAILURE(status)) {
1840 printk(KERN_ERR PREFIX
1841 "Error installing notify handler\n");
1842 if(data->brightness)
1843 kfree(data->brightness->levels);
1844 kfree(data->brightness);
1849 mutex_lock(&video->device_list_lock);
1850 list_add_tail(&data->entry, &video->video_device_list);
1851 mutex_unlock(&video->device_list_lock);
1853 acpi_video_device_add_fs(device);
1863 * video : video bus device
1868 * Enumerate the video device list of the video bus,
1869 * bind the ids with the corresponding video devices
1870 * under the video bus.
1873 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1875 struct acpi_video_device *dev;
1877 mutex_lock(&video->device_list_lock);
1879 list_for_each_entry(dev, &video->video_device_list, entry)
1880 acpi_video_device_bind(video, dev);
1882 mutex_unlock(&video->device_list_lock);
1887 * video : video bus device
1888 * device : video output device under the video
1894 * Bind the ids with the corresponding video devices
1895 * under the video bus.
1899 acpi_video_device_bind(struct acpi_video_bus *video,
1900 struct acpi_video_device *device)
1902 struct acpi_video_enumerated_device *ids;
1905 for (i = 0; i < video->attached_count; i++) {
1906 ids = &video->attached_array[i];
1907 if (device->device_id == (ids->value.int_val & 0xffff)) {
1908 ids->bind_info = device;
1909 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1916 * video : video bus device
1921 * Call _DOD to enumerate all devices attached to display adapter
1925 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1930 struct acpi_video_enumerated_device *active_list;
1931 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1932 union acpi_object *dod = NULL;
1933 union acpi_object *obj;
1935 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1936 if (!ACPI_SUCCESS(status)) {
1937 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1941 dod = buffer.pointer;
1942 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1943 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1948 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1949 dod->package.count));
1951 active_list = kcalloc(1 + dod->package.count,
1952 sizeof(struct acpi_video_enumerated_device),
1960 for (i = 0; i < dod->package.count; i++) {
1961 obj = &dod->package.elements[i];
1963 if (obj->type != ACPI_TYPE_INTEGER) {
1964 printk(KERN_ERR PREFIX
1965 "Invalid _DOD data in element %d\n", i);
1969 active_list[count].value.int_val = obj->integer.value;
1970 active_list[count].bind_info = NULL;
1971 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1972 (int)obj->integer.value));
1976 kfree(video->attached_array);
1978 video->attached_array = active_list;
1979 video->attached_count = count;
1982 kfree(buffer.pointer);
1987 acpi_video_get_next_level(struct acpi_video_device *device,
1988 u32 level_current, u32 event)
1990 int min, max, min_above, max_below, i, l, delta = 255;
1991 max = max_below = 0;
1992 min = min_above = 255;
1993 /* Find closest level to level_current */
1994 for (i = 2; i < device->brightness->count; i++) {
1995 l = device->brightness->levels[i];
1996 if (abs(l - level_current) < abs(delta)) {
1997 delta = l - level_current;
2002 /* Ajust level_current to closest available level */
2003 level_current += delta;
2004 for (i = 2; i < device->brightness->count; i++) {
2005 l = device->brightness->levels[i];
2010 if (l < min_above && l > level_current)
2012 if (l > max_below && l < level_current)
2017 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
2018 return (level_current < max) ? min_above : min;
2019 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
2020 return (level_current < max) ? min_above : max;
2021 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
2022 return (level_current > min) ? max_below : min;
2023 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
2024 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
2027 return level_current;
2032 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
2034 unsigned long long level_current, level_next;
2035 int result = -EINVAL;
2037 /* no warning message if acpi_backlight=vendor is used */
2038 if (!acpi_video_backlight_support())
2041 if (!device->brightness)
2044 result = acpi_video_device_lcd_get_level_current(device,
2049 level_next = acpi_video_get_next_level(device, level_current, event);
2051 result = acpi_video_device_lcd_set_level(device, level_next);
2054 backlight_force_update(device->backlight,
2055 BACKLIGHT_UPDATE_HOTKEY);
2059 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
2064 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
2067 struct acpi_video_bus *video;
2068 struct acpi_video_device *video_device;
2069 union acpi_object *buffer = NULL;
2073 if (!device || !acpi_driver_data(device))
2076 video = acpi_driver_data(device);
2078 for (i = 0; i < video->attached_count; i++) {
2079 video_device = video->attached_array[i].bind_info;
2087 case ACPI_VIDEO_DISPLAY_CRT:
2088 if (!video_device->flags.crt)
2091 case ACPI_VIDEO_DISPLAY_TV:
2092 if (!video_device->flags.tvout)
2095 case ACPI_VIDEO_DISPLAY_DVI:
2096 if (!video_device->flags.dvi)
2099 case ACPI_VIDEO_DISPLAY_LCD:
2100 if (!video_device->flags.lcd)
2104 } else if (video_device->device_id != device_id) {
2108 status = acpi_video_device_EDID(video_device, &buffer, length);
2110 if (ACPI_FAILURE(status) || !buffer ||
2111 buffer->type != ACPI_TYPE_BUFFER) {
2113 status = acpi_video_device_EDID(video_device, &buffer,
2115 if (ACPI_FAILURE(status) || !buffer ||
2116 buffer->type != ACPI_TYPE_BUFFER) {
2121 *edid = buffer->buffer.pointer;
2127 EXPORT_SYMBOL(acpi_video_get_edid);
2130 acpi_video_bus_get_devices(struct acpi_video_bus *video,
2131 struct acpi_device *device)
2134 struct acpi_device *dev;
2136 acpi_video_device_enumerate(video);
2138 list_for_each_entry(dev, &device->children, node) {
2140 status = acpi_video_bus_get_one_device(dev, video);
2141 if (ACPI_FAILURE(status)) {
2142 printk(KERN_WARNING PREFIX
2143 "Cant attach device");
2150 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
2153 struct acpi_video_bus *video;
2156 if (!device || !device->video)
2159 video = device->video;
2161 acpi_video_device_remove_fs(device->dev);
2163 status = acpi_remove_notify_handler(device->dev->handle,
2165 acpi_video_device_notify);
2166 if (device->backlight) {
2167 sysfs_remove_link(&device->backlight->dev.kobj, "device");
2168 backlight_device_unregister(device->backlight);
2169 device->backlight = NULL;
2171 if (device->cooling_dev) {
2172 sysfs_remove_link(&device->dev->dev.kobj,
2174 sysfs_remove_link(&device->cooling_dev->device.kobj,
2176 thermal_cooling_device_unregister(device->cooling_dev);
2177 device->cooling_dev = NULL;
2179 video_output_unregister(device->output_dev);
2184 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2187 struct acpi_video_device *dev, *next;
2189 mutex_lock(&video->device_list_lock);
2191 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2193 status = acpi_video_bus_put_one_device(dev);
2194 if (ACPI_FAILURE(status))
2195 printk(KERN_WARNING PREFIX
2196 "hhuuhhuu bug in acpi video driver.\n");
2198 if (dev->brightness) {
2199 kfree(dev->brightness->levels);
2200 kfree(dev->brightness);
2202 list_del(&dev->entry);
2206 mutex_unlock(&video->device_list_lock);
2211 /* acpi_video interface */
2213 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
2215 return acpi_video_bus_DOS(video, 0, 0);
2218 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
2220 return acpi_video_bus_DOS(video, 0, 1);
2223 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
2225 struct acpi_video_bus *video = acpi_driver_data(device);
2226 struct input_dev *input;
2232 input = video->input;
2235 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
2236 * most likely via hotkey. */
2237 acpi_bus_generate_proc_event(device, event, 0);
2238 keycode = KEY_SWITCHVIDEOMODE;
2241 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
2243 acpi_video_device_enumerate(video);
2244 acpi_video_device_rebind(video);
2245 acpi_bus_generate_proc_event(device, event, 0);
2246 keycode = KEY_SWITCHVIDEOMODE;
2249 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
2250 acpi_bus_generate_proc_event(device, event, 0);
2251 keycode = KEY_SWITCHVIDEOMODE;
2253 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
2254 acpi_bus_generate_proc_event(device, event, 0);
2255 keycode = KEY_VIDEO_NEXT;
2257 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
2258 acpi_bus_generate_proc_event(device, event, 0);
2259 keycode = KEY_VIDEO_PREV;
2263 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2264 "Unsupported event [0x%x]\n", event));
2268 acpi_notifier_call_chain(device, event, 0);
2271 input_report_key(input, keycode, 1);
2273 input_report_key(input, keycode, 0);
2280 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
2282 struct acpi_video_device *video_device = data;
2283 struct acpi_device *device = NULL;
2284 struct acpi_video_bus *bus;
2285 struct input_dev *input;
2291 device = video_device->dev;
2292 bus = video_device->video;
2296 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
2297 if (brightness_switch_enabled)
2298 acpi_video_switch_brightness(video_device, event);
2299 acpi_bus_generate_proc_event(device, event, 0);
2300 keycode = KEY_BRIGHTNESS_CYCLE;
2302 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
2303 if (brightness_switch_enabled)
2304 acpi_video_switch_brightness(video_device, event);
2305 acpi_bus_generate_proc_event(device, event, 0);
2306 keycode = KEY_BRIGHTNESSUP;
2308 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
2309 if (brightness_switch_enabled)
2310 acpi_video_switch_brightness(video_device, event);
2311 acpi_bus_generate_proc_event(device, event, 0);
2312 keycode = KEY_BRIGHTNESSDOWN;
2314 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
2315 if (brightness_switch_enabled)
2316 acpi_video_switch_brightness(video_device, event);
2317 acpi_bus_generate_proc_event(device, event, 0);
2318 keycode = KEY_BRIGHTNESS_ZERO;
2320 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
2321 if (brightness_switch_enabled)
2322 acpi_video_switch_brightness(video_device, event);
2323 acpi_bus_generate_proc_event(device, event, 0);
2324 keycode = KEY_DISPLAY_OFF;
2327 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2328 "Unsupported event [0x%x]\n", event));
2332 acpi_notifier_call_chain(device, event, 0);
2335 input_report_key(input, keycode, 1);
2337 input_report_key(input, keycode, 0);
2344 static int acpi_video_resume(struct notifier_block *nb,
2345 unsigned long val, void *ign)
2347 struct acpi_video_bus *video;
2348 struct acpi_video_device *video_device;
2352 case PM_HIBERNATION_PREPARE:
2353 case PM_SUSPEND_PREPARE:
2354 case PM_RESTORE_PREPARE:
2358 video = container_of(nb, struct acpi_video_bus, pm_nb);
2360 dev_info(&video->device->dev, "Restoring backlight state\n");
2362 for (i = 0; i < video->attached_count; i++) {
2363 video_device = video->attached_array[i].bind_info;
2364 if (video_device && video_device->backlight)
2365 acpi_video_set_brightness(video_device->backlight);
2372 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
2373 void **return_value)
2375 struct acpi_device *device = context;
2376 struct acpi_device *sibling;
2379 if (handle == device->handle)
2380 return AE_CTRL_TERMINATE;
2382 result = acpi_bus_get_device(handle, &sibling);
2386 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
2387 return AE_ALREADY_EXISTS;
2392 static int instance;
2394 static int acpi_video_bus_add(struct acpi_device *device)
2396 struct acpi_video_bus *video;
2397 struct input_dev *input;
2401 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
2402 device->parent->handle, 1,
2403 acpi_video_bus_match, NULL,
2405 if (status == AE_ALREADY_EXISTS) {
2406 printk(KERN_WARNING FW_BUG
2407 "Duplicate ACPI video bus devices for the"
2408 " same VGA controller, please try module "
2409 "parameter \"video.allow_duplicates=1\""
2410 "if the current driver doesn't work.\n");
2411 if (!allow_duplicates)
2415 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2419 /* a hack to fix the duplicate name "VID" problem on T61 */
2420 if (!strcmp(device->pnp.bus_id, "VID")) {
2422 device->pnp.bus_id[3] = '0' + instance;
2425 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2426 if (!strcmp(device->pnp.bus_id, "VGA")) {
2428 device->pnp.bus_id[3] = '0' + instance;
2432 video->device = device;
2433 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2434 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2435 device->driver_data = video;
2437 acpi_video_bus_find_cap(video);
2438 error = acpi_video_bus_check(video);
2440 goto err_free_video;
2442 error = acpi_video_bus_add_fs(device);
2444 goto err_free_video;
2446 mutex_init(&video->device_list_lock);
2447 INIT_LIST_HEAD(&video->video_device_list);
2449 acpi_video_bus_get_devices(video, device);
2450 acpi_video_bus_start_devices(video);
2452 video->input = input = input_allocate_device();
2455 goto err_stop_video;
2458 snprintf(video->phys, sizeof(video->phys),
2459 "%s/video/input0", acpi_device_hid(video->device));
2461 input->name = acpi_device_name(video->device);
2462 input->phys = video->phys;
2463 input->id.bustype = BUS_HOST;
2464 input->id.product = 0x06;
2465 input->dev.parent = &device->dev;
2466 input->evbit[0] = BIT(EV_KEY);
2467 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2468 set_bit(KEY_VIDEO_NEXT, input->keybit);
2469 set_bit(KEY_VIDEO_PREV, input->keybit);
2470 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2471 set_bit(KEY_BRIGHTNESSUP, input->keybit);
2472 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2473 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2474 set_bit(KEY_DISPLAY_OFF, input->keybit);
2476 error = input_register_device(input);
2478 goto err_free_input_dev;
2480 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
2481 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2482 video->flags.multihead ? "yes" : "no",
2483 video->flags.rom ? "yes" : "no",
2484 video->flags.post ? "yes" : "no");
2486 video->pm_nb.notifier_call = acpi_video_resume;
2487 video->pm_nb.priority = 0;
2488 register_pm_notifier(&video->pm_nb);
2493 input_free_device(input);
2495 acpi_video_bus_stop_devices(video);
2496 acpi_video_bus_put_devices(video);
2497 kfree(video->attached_array);
2498 acpi_video_bus_remove_fs(device);
2501 device->driver_data = NULL;
2506 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2508 struct acpi_video_bus *video = NULL;
2511 if (!device || !acpi_driver_data(device))
2514 video = acpi_driver_data(device);
2516 unregister_pm_notifier(&video->pm_nb);
2518 acpi_video_bus_stop_devices(video);
2519 acpi_video_bus_put_devices(video);
2520 acpi_video_bus_remove_fs(device);
2522 input_unregister_device(video->input);
2523 kfree(video->attached_array);
2529 static int __init intel_opregion_present(void)
2531 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
2532 struct pci_dev *dev = NULL;
2535 for_each_pci_dev(dev) {
2536 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2538 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2540 pci_read_config_dword(dev, 0xfc, &address);
2549 int acpi_video_register(void)
2552 if (register_count) {
2554 * if the function of acpi_video_register is already called,
2555 * don't register the acpi_vide_bus again and return no error.
2560 acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2561 if (!acpi_video_dir)
2564 result = acpi_bus_register_driver(&acpi_video_bus);
2566 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2571 * When the acpi_video_bus is loaded successfully, increase
2572 * the counter reference.
2578 EXPORT_SYMBOL(acpi_video_register);
2580 void acpi_video_unregister(void)
2582 if (!register_count) {
2584 * If the acpi video bus is already unloaded, don't
2585 * unload it again and return directly.
2589 acpi_bus_unregister_driver(&acpi_video_bus);
2591 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2597 EXPORT_SYMBOL(acpi_video_unregister);
2600 * This is kind of nasty. Hardware using Intel chipsets may require
2601 * the video opregion code to be run first in order to initialise
2602 * state before any ACPI video calls are made. To handle this we defer
2603 * registration of the video class until the opregion code has run.
2606 static int __init acpi_video_init(void)
2608 dmi_check_system(video_dmi_table);
2610 if (intel_opregion_present())
2613 return acpi_video_register();
2616 static void __exit acpi_video_exit(void)
2618 acpi_video_unregister();
2623 module_init(acpi_video_init);
2624 module_exit(acpi_video_exit);