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 <asm/uaccess.h>
44 #include <acpi/acpi_bus.h>
45 #include <acpi/acpi_drivers.h>
47 #define ACPI_VIDEO_CLASS "video"
48 #define ACPI_VIDEO_BUS_NAME "Video Bus"
49 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
50 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
51 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
52 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
53 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
54 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
56 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
57 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
58 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
59 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
60 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
62 #define MAX_NAME_LEN 20
64 #define ACPI_VIDEO_DISPLAY_CRT 1
65 #define ACPI_VIDEO_DISPLAY_TV 2
66 #define ACPI_VIDEO_DISPLAY_DVI 3
67 #define ACPI_VIDEO_DISPLAY_LCD 4
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);
79 static int register_count = 0;
80 static int acpi_video_bus_add(struct acpi_device *device);
81 static int acpi_video_bus_remove(struct acpi_device *device, int type);
82 static int acpi_video_resume(struct acpi_device *device);
83 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
85 static const struct acpi_device_id video_device_ids[] = {
89 MODULE_DEVICE_TABLE(acpi, video_device_ids);
91 static struct acpi_driver acpi_video_bus = {
93 .class = ACPI_VIDEO_CLASS,
94 .ids = video_device_ids,
96 .add = acpi_video_bus_add,
97 .remove = acpi_video_bus_remove,
98 .resume = acpi_video_resume,
99 .notify = acpi_video_bus_notify,
103 struct acpi_video_bus_flags {
104 u8 multihead:1; /* can switch video heads */
105 u8 rom:1; /* can retrieve a video rom */
106 u8 post:1; /* can configure the head to */
110 struct acpi_video_bus_cap {
111 u8 _DOS:1; /*Enable/Disable output switching */
112 u8 _DOD:1; /*Enumerate all devices attached to display adapter */
113 u8 _ROM:1; /*Get ROM Data */
114 u8 _GPD:1; /*Get POST Device */
115 u8 _SPD:1; /*Set POST Device */
116 u8 _VPO:1; /*Video POST Options */
120 struct acpi_video_device_attrib {
121 u32 display_index:4; /* A zero-based instance of the Display */
122 u32 display_port_attachment:4; /*This field differentiates the display type */
123 u32 display_type:4; /*Describe the specific type in use */
124 u32 vendor_specific:4; /*Chipset Vendor Specific */
125 u32 bios_can_detect:1; /*BIOS can detect the device */
126 u32 depend_on_vga:1; /*Non-VGA output device whose power is related to
128 u32 pipe_id:3; /*For VGA multiple-head devices. */
129 u32 reserved:10; /*Must be 0 */
130 u32 device_id_scheme:1; /*Device ID Scheme */
133 struct acpi_video_enumerated_device {
136 struct acpi_video_device_attrib attrib;
138 struct acpi_video_device *bind_info;
141 struct acpi_video_bus {
142 struct acpi_device *device;
144 struct acpi_video_enumerated_device *attached_array;
146 struct acpi_video_bus_cap cap;
147 struct acpi_video_bus_flags flags;
148 struct list_head video_device_list;
149 struct mutex device_list_lock; /* protects video_device_list */
150 struct proc_dir_entry *dir;
151 struct input_dev *input;
152 char phys[32]; /* for input device */
155 struct acpi_video_device_flags {
165 struct acpi_video_device_cap {
166 u8 _ADR:1; /*Return the unique ID */
167 u8 _BCL:1; /*Query list of brightness control levels supported */
168 u8 _BCM:1; /*Set the brightness level */
169 u8 _BQC:1; /* Get current brightness level */
170 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
171 u8 _DDC:1; /*Return the EDID for this device */
172 u8 _DCS:1; /*Return status of output device */
173 u8 _DGS:1; /*Query graphics state */
174 u8 _DSS:1; /*Device state set */
177 struct acpi_video_brightness_flags {
178 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
179 u8 _BCL_reversed:1; /* _BCL package is in a reversed order*/
180 u8 _BCL_use_index:1; /* levels in _BCL are index values */
181 u8 _BCM_use_index:1; /* input of _BCM is an index value */
182 u8 _BQC_use_index:1; /* _BQC returns an index value */
185 struct acpi_video_device_brightness {
189 struct acpi_video_brightness_flags flags;
192 struct acpi_video_device {
193 unsigned long device_id;
194 struct acpi_video_device_flags flags;
195 struct acpi_video_device_cap cap;
196 struct list_head entry;
197 struct acpi_video_bus *video;
198 struct acpi_device *dev;
199 struct acpi_video_device_brightness *brightness;
200 struct backlight_device *backlight;
201 struct thermal_cooling_device *cdev;
202 struct output_device *output_dev;
206 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
207 static const struct file_operations acpi_video_bus_info_fops = {
208 .owner = THIS_MODULE,
209 .open = acpi_video_bus_info_open_fs,
212 .release = single_release,
215 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
216 static const struct file_operations acpi_video_bus_ROM_fops = {
217 .owner = THIS_MODULE,
218 .open = acpi_video_bus_ROM_open_fs,
221 .release = single_release,
224 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
226 static const struct file_operations acpi_video_bus_POST_info_fops = {
227 .owner = THIS_MODULE,
228 .open = acpi_video_bus_POST_info_open_fs,
231 .release = single_release,
234 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
235 static ssize_t acpi_video_bus_write_POST(struct file *file,
236 const char __user *buffer, size_t count, loff_t *data);
237 static const struct file_operations acpi_video_bus_POST_fops = {
238 .owner = THIS_MODULE,
239 .open = acpi_video_bus_POST_open_fs,
241 .write = acpi_video_bus_write_POST,
243 .release = single_release,
246 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
247 static ssize_t acpi_video_bus_write_DOS(struct file *file,
248 const char __user *buffer, size_t count, loff_t *data);
249 static const struct file_operations acpi_video_bus_DOS_fops = {
250 .owner = THIS_MODULE,
251 .open = acpi_video_bus_DOS_open_fs,
253 .write = acpi_video_bus_write_DOS,
255 .release = single_release,
259 static int acpi_video_device_info_open_fs(struct inode *inode,
261 static const struct file_operations acpi_video_device_info_fops = {
262 .owner = THIS_MODULE,
263 .open = acpi_video_device_info_open_fs,
266 .release = single_release,
269 static int acpi_video_device_state_open_fs(struct inode *inode,
271 static ssize_t acpi_video_device_write_state(struct file *file,
272 const char __user *buffer, size_t count, loff_t *data);
273 static const struct file_operations acpi_video_device_state_fops = {
274 .owner = THIS_MODULE,
275 .open = acpi_video_device_state_open_fs,
277 .write = acpi_video_device_write_state,
279 .release = single_release,
282 static int acpi_video_device_brightness_open_fs(struct inode *inode,
284 static ssize_t acpi_video_device_write_brightness(struct file *file,
285 const char __user *buffer, size_t count, loff_t *data);
286 static struct file_operations acpi_video_device_brightness_fops = {
287 .owner = THIS_MODULE,
288 .open = acpi_video_device_brightness_open_fs,
290 .write = acpi_video_device_write_brightness,
292 .release = single_release,
295 static int acpi_video_device_EDID_open_fs(struct inode *inode,
297 static const struct file_operations acpi_video_device_EDID_fops = {
298 .owner = THIS_MODULE,
299 .open = acpi_video_device_EDID_open_fs,
302 .release = single_release,
305 static const char device_decode[][30] = {
306 "motherboard VGA device",
312 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
313 static void acpi_video_device_rebind(struct acpi_video_bus *video);
314 static void acpi_video_device_bind(struct acpi_video_bus *video,
315 struct acpi_video_device *device);
316 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
317 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
319 static int acpi_video_device_lcd_get_level_current(
320 struct acpi_video_device *device,
321 unsigned long long *level);
322 static int acpi_video_get_next_level(struct acpi_video_device *device,
323 u32 level_current, u32 event);
324 static int acpi_video_switch_brightness(struct acpi_video_device *device,
326 static int acpi_video_device_get_state(struct acpi_video_device *device,
327 unsigned long long *state);
328 static int acpi_video_output_get(struct output_device *od);
329 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
331 /*backlight device sysfs support*/
332 static int acpi_video_get_brightness(struct backlight_device *bd)
334 unsigned long long cur_level;
336 struct acpi_video_device *vd =
337 (struct acpi_video_device *)bl_get_data(bd);
339 if (acpi_video_device_lcd_get_level_current(vd, &cur_level))
341 for (i = 2; i < vd->brightness->count; i++) {
342 if (vd->brightness->levels[i] == cur_level)
343 /* The first two entries are special - see page 575
344 of the ACPI spec 3.0 */
350 static int acpi_video_set_brightness(struct backlight_device *bd)
352 int request_level = bd->props.brightness + 2;
353 struct acpi_video_device *vd =
354 (struct acpi_video_device *)bl_get_data(bd);
356 return acpi_video_device_lcd_set_level(vd,
357 vd->brightness->levels[request_level]);
360 static struct backlight_ops acpi_backlight_ops = {
361 .get_brightness = acpi_video_get_brightness,
362 .update_status = acpi_video_set_brightness,
365 /*video output device sysfs support*/
366 static int acpi_video_output_get(struct output_device *od)
368 unsigned long long state;
369 struct acpi_video_device *vd =
370 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
371 acpi_video_device_get_state(vd, &state);
375 static int acpi_video_output_set(struct output_device *od)
377 unsigned long state = od->request_state;
378 struct acpi_video_device *vd=
379 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
380 return acpi_video_device_set_state(vd, state);
383 static struct output_properties acpi_output_properties = {
384 .set_state = acpi_video_output_set,
385 .get_status = acpi_video_output_get,
389 /* thermal cooling device callbacks */
390 static int video_get_max_state(struct thermal_cooling_device *cdev, unsigned
393 struct acpi_device *device = cdev->devdata;
394 struct acpi_video_device *video = acpi_driver_data(device);
396 *state = video->brightness->count - 3;
400 static int video_get_cur_state(struct thermal_cooling_device *cdev, unsigned
403 struct acpi_device *device = cdev->devdata;
404 struct acpi_video_device *video = acpi_driver_data(device);
405 unsigned long long level;
408 if (acpi_video_device_lcd_get_level_current(video, &level))
410 for (offset = 2; offset < video->brightness->count; offset++)
411 if (level == video->brightness->levels[offset]) {
412 *state = video->brightness->count - offset - 1;
420 video_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
422 struct acpi_device *device = cdev->devdata;
423 struct acpi_video_device *video = acpi_driver_data(device);
426 if ( state >= video->brightness->count - 2)
429 state = video->brightness->count - state;
430 level = video->brightness->levels[state -1];
431 return acpi_video_device_lcd_set_level(video, level);
434 static struct thermal_cooling_device_ops video_cooling_ops = {
435 .get_max_state = video_get_max_state,
436 .get_cur_state = video_get_cur_state,
437 .set_cur_state = video_set_cur_state,
440 /* --------------------------------------------------------------------------
442 -------------------------------------------------------------------------- */
447 acpi_video_device_query(struct acpi_video_device *device, unsigned long long *state)
451 status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
457 acpi_video_device_get_state(struct acpi_video_device *device,
458 unsigned long long *state)
462 status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
468 acpi_video_device_set_state(struct acpi_video_device *device, int state)
471 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
472 struct acpi_object_list args = { 1, &arg0 };
473 unsigned long long ret;
476 arg0.integer.value = state;
477 status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
483 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
484 union acpi_object **levels)
487 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
488 union acpi_object *obj;
493 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
494 if (!ACPI_SUCCESS(status))
496 obj = (union acpi_object *)buffer.pointer;
497 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
498 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
508 kfree(buffer.pointer);
514 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
517 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
518 struct acpi_object_list args = { 1, &arg0 };
521 arg0.integer.value = level;
523 status = acpi_evaluate_object(device->dev->handle, "_BCM",
525 if (ACPI_FAILURE(status)) {
526 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
530 device->brightness->curr = level;
531 for (state = 2; state < device->brightness->count; state++)
532 if (level == device->brightness->levels[state]) {
533 if (device->backlight)
534 device->backlight->props.brightness = state - 2;
538 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
543 * For some buggy _BQC methods, we need to add a constant value to
544 * the _BQC return value to get the actual current brightness level
547 static int bqc_offset_aml_bug_workaround;
548 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
550 bqc_offset_aml_bug_workaround = 9;
554 static struct dmi_system_id video_dmi_table[] __initdata = {
556 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
559 .callback = video_set_bqc_offset,
560 .ident = "Acer Aspire 5720",
562 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
563 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
567 .callback = video_set_bqc_offset,
568 .ident = "Acer Aspire 5710Z",
570 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
571 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
575 .callback = video_set_bqc_offset,
576 .ident = "eMachines E510",
578 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
579 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
583 .callback = video_set_bqc_offset,
584 .ident = "Acer Aspire 5315",
586 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
587 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
594 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
595 unsigned long long *level)
597 acpi_status status = AE_OK;
599 if (device->cap._BQC || device->cap._BCQ) {
600 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
602 status = acpi_evaluate_integer(device->dev->handle, buf,
604 if (ACPI_SUCCESS(status)) {
605 if (device->brightness->flags._BQC_use_index) {
606 if (device->brightness->flags._BCL_reversed)
607 *level = device->brightness->count
609 *level = device->brightness->levels[*level + 2];
612 *level += bqc_offset_aml_bug_workaround;
613 device->brightness->curr = *level;
617 * should we return an error or ignore this failure?
618 * dev->brightness->curr is a cached value which stores
619 * the correct current backlight level in most cases.
620 * ACPI video backlight still works w/ buggy _BQC.
621 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
623 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
624 device->cap._BQC = device->cap._BCQ = 0;
628 *level = device->brightness->curr;
633 acpi_video_device_EDID(struct acpi_video_device *device,
634 union acpi_object **edid, ssize_t length)
637 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
638 union acpi_object *obj;
639 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
640 struct acpi_object_list args = { 1, &arg0 };
648 arg0.integer.value = 1;
649 else if (length == 256)
650 arg0.integer.value = 2;
654 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
655 if (ACPI_FAILURE(status))
658 obj = buffer.pointer;
660 if (obj && obj->type == ACPI_TYPE_BUFFER)
663 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
674 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
677 unsigned long long tmp;
678 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
679 struct acpi_object_list args = { 1, &arg0 };
682 arg0.integer.value = option;
684 status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
685 if (ACPI_SUCCESS(status))
686 status = tmp ? (-EINVAL) : (AE_OK);
692 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long long *id)
696 status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
702 acpi_video_bus_POST_options(struct acpi_video_bus *video,
703 unsigned long long *options)
707 status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
715 * video : video bus device pointer
717 * 0. The system BIOS should NOT automatically switch(toggle)
718 * the active display output.
719 * 1. The system BIOS should automatically switch (toggle) the
720 * active display output. No switch event.
721 * 2. The _DGS value should be locked.
722 * 3. The system BIOS should not automatically switch (toggle) the
723 * active display output, but instead generate the display switch
726 * 0. The system BIOS should automatically control the brightness level
727 * of the LCD when the power changes from AC to DC
728 * 1. The system BIOS should NOT automatically control the brightness
729 * level of the LCD when the power changes from AC to DC.
735 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
737 acpi_integer status = 0;
738 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
739 struct acpi_object_list args = { 1, &arg0 };
742 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
746 arg0.integer.value = (lcd_flag << 2) | bios_flag;
747 video->dos_setting = arg0.integer.value;
748 acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
755 * Simple comparison function used to sort backlight levels.
759 acpi_video_cmp_level(const void *a, const void *b)
761 return *(int *)a - *(int *)b;
766 * device : video output device (LCD, CRT, ..)
769 * Maximum brightness level
771 * Allocate and initialize device->brightness.
775 acpi_video_init_brightness(struct acpi_video_device *device)
777 union acpi_object *obj = NULL;
778 int i, max_level = 0, count = 0, level_ac_battery = 0;
779 unsigned long long level, level_old;
780 union acpi_object *o;
781 struct acpi_video_device_brightness *br = NULL;
782 int result = -EINVAL;
784 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
785 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
786 "LCD brightness level\n"));
790 if (obj->package.count < 2)
793 br = kzalloc(sizeof(*br), GFP_KERNEL);
795 printk(KERN_ERR "can't allocate memory\n");
800 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
807 for (i = 0; i < obj->package.count; i++) {
808 o = (union acpi_object *)&obj->package.elements[i];
809 if (o->type != ACPI_TYPE_INTEGER) {
810 printk(KERN_ERR PREFIX "Invalid data\n");
813 br->levels[count] = (u32) o->integer.value;
815 if (br->levels[count] > max_level)
816 max_level = br->levels[count];
821 * some buggy BIOS don't export the levels
822 * when machine is on AC/Battery in _BCL package.
823 * In this case, the first two elements in _BCL packages
824 * are also supported brightness levels that OS should take care of.
826 for (i = 2; i < count; i++) {
827 if (br->levels[i] == br->levels[0])
829 if (br->levels[i] == br->levels[1])
833 if (level_ac_battery < 2) {
834 level_ac_battery = 2 - level_ac_battery;
835 br->flags._BCL_no_ac_battery_levels = 1;
836 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
837 br->levels[i] = br->levels[i - level_ac_battery];
838 count += level_ac_battery;
839 } else if (level_ac_battery > 2)
840 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
842 /* Check if the _BCL package is in a reversed order */
843 if (max_level == br->levels[2]) {
844 br->flags._BCL_reversed = 1;
845 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
846 acpi_video_cmp_level, NULL);
847 } else if (max_level != br->levels[count - 1])
849 "Found unordered _BCL package\n"));
852 device->brightness = br;
854 /* Check the input/output of _BQC/_BCL/_BCM */
855 if ((max_level < 100) && (max_level <= (count - 2)))
856 br->flags._BCL_use_index = 1;
859 * _BCM is always consistent with _BCL,
860 * at least for all the laptops we have ever seen.
862 br->flags._BCM_use_index = br->flags._BCL_use_index;
864 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
865 br->curr = level_old = max_level;
867 if (!device->cap._BQC)
870 result = acpi_video_device_lcd_get_level_current(device, &level_old);
872 goto out_free_levels;
875 * Set the level to maximum and check if _BQC uses indexed value
877 result = acpi_video_device_lcd_set_level(device, max_level);
879 goto out_free_levels;
881 result = acpi_video_device_lcd_get_level_current(device, &level);
883 goto out_free_levels;
885 br->flags._BQC_use_index = (level == max_level ? 0 : 1);
887 if (!br->flags._BQC_use_index)
890 if (br->flags._BCL_reversed)
891 level_old = (br->count - 1) - level_old;
892 level_old = br->levels[level_old];
895 result = acpi_video_device_lcd_set_level(device, level_old);
897 goto out_free_levels;
899 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
900 "found %d brightness levels\n", count - 2));
909 device->brightness = NULL;
916 * device : video output device (LCD, CRT, ..)
921 * Find out all required AML methods defined under the output
925 static void acpi_video_device_find_cap(struct acpi_video_device *device)
927 acpi_handle h_dummy1;
930 memset(&device->cap, 0, sizeof(device->cap));
932 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
933 device->cap._ADR = 1;
935 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
936 device->cap._BCL = 1;
938 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
939 device->cap._BCM = 1;
941 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
942 device->cap._BQC = 1;
943 else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
945 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
946 device->cap._BCQ = 1;
949 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
950 device->cap._DDC = 1;
952 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
953 device->cap._DCS = 1;
955 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
956 device->cap._DGS = 1;
958 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
959 device->cap._DSS = 1;
962 if (acpi_video_backlight_support()) {
964 static int count = 0;
967 result = acpi_video_init_brightness(device);
970 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
974 sprintf(name, "acpi_video%d", count++);
975 device->backlight = backlight_device_register(name,
976 NULL, device, &acpi_backlight_ops);
977 device->backlight->props.max_brightness = device->brightness->count-3;
980 device->cdev = thermal_cooling_device_register("LCD",
981 device->dev, &video_cooling_ops);
982 if (IS_ERR(device->cdev))
985 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
987 result = sysfs_create_link(&device->dev->dev.kobj,
988 &device->cdev->device.kobj,
991 printk(KERN_ERR PREFIX "Create sysfs link\n");
992 result = sysfs_create_link(&device->cdev->device.kobj,
993 &device->dev->dev.kobj, "device");
995 printk(KERN_ERR PREFIX "Create sysfs link\n");
999 if (acpi_video_display_switch_support()) {
1001 if (device->cap._DCS && device->cap._DSS) {
1004 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
1007 sprintf(name, "acpi_video%d", count++);
1008 device->output_dev = video_output_register(name,
1009 NULL, device, &acpi_output_properties);
1017 * device : video output device (VGA)
1022 * Find out all required AML methods defined under the video bus device.
1025 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1027 acpi_handle h_dummy1;
1029 memset(&video->cap, 0, sizeof(video->cap));
1030 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
1031 video->cap._DOS = 1;
1033 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
1034 video->cap._DOD = 1;
1036 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
1037 video->cap._ROM = 1;
1039 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
1040 video->cap._GPD = 1;
1042 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
1043 video->cap._SPD = 1;
1045 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
1046 video->cap._VPO = 1;
1051 * Check whether the video bus device has required AML method to
1052 * support the desired features
1055 static int acpi_video_bus_check(struct acpi_video_bus *video)
1057 acpi_status status = -ENOENT;
1063 dev = acpi_get_physical_pci_device(video->device->handle);
1068 /* Since there is no HID, CID and so on for VGA driver, we have
1069 * to check well known required nodes.
1072 /* Does this device support video switching? */
1073 if (video->cap._DOS) {
1074 video->flags.multihead = 1;
1078 /* Does this device support retrieving a video ROM? */
1079 if (video->cap._ROM) {
1080 video->flags.rom = 1;
1084 /* Does this device support configuring which video device to POST? */
1085 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1086 video->flags.post = 1;
1093 /* --------------------------------------------------------------------------
1094 FS Interface (/proc)
1095 -------------------------------------------------------------------------- */
1097 static struct proc_dir_entry *acpi_video_dir;
1101 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
1103 struct acpi_video_device *dev = seq->private;
1109 seq_printf(seq, "device_id: 0x%04x\n", (u32) dev->device_id);
1110 seq_printf(seq, "type: ");
1112 seq_printf(seq, "CRT\n");
1113 else if (dev->flags.lcd)
1114 seq_printf(seq, "LCD\n");
1115 else if (dev->flags.tvout)
1116 seq_printf(seq, "TVOUT\n");
1117 else if (dev->flags.dvi)
1118 seq_printf(seq, "DVI\n");
1120 seq_printf(seq, "UNKNOWN\n");
1122 seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
1129 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
1131 return single_open(file, acpi_video_device_info_seq_show,
1135 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
1138 struct acpi_video_device *dev = seq->private;
1139 unsigned long long state;
1145 status = acpi_video_device_get_state(dev, &state);
1146 seq_printf(seq, "state: ");
1147 if (ACPI_SUCCESS(status))
1148 seq_printf(seq, "0x%02llx\n", state);
1150 seq_printf(seq, "<not supported>\n");
1152 status = acpi_video_device_query(dev, &state);
1153 seq_printf(seq, "query: ");
1154 if (ACPI_SUCCESS(status))
1155 seq_printf(seq, "0x%02llx\n", state);
1157 seq_printf(seq, "<not supported>\n");
1164 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
1166 return single_open(file, acpi_video_device_state_seq_show,
1171 acpi_video_device_write_state(struct file *file,
1172 const char __user * buffer,
1173 size_t count, loff_t * data)
1176 struct seq_file *m = file->private_data;
1177 struct acpi_video_device *dev = m->private;
1178 char str[12] = { 0 };
1182 if (!dev || count + 1 > sizeof str)
1185 if (copy_from_user(str, buffer, count))
1189 state = simple_strtoul(str, NULL, 0);
1190 state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
1192 status = acpi_video_device_set_state(dev, state);
1201 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
1203 struct acpi_video_device *dev = seq->private;
1207 if (!dev || !dev->brightness) {
1208 seq_printf(seq, "<not supported>\n");
1212 seq_printf(seq, "levels: ");
1213 for (i = 2; i < dev->brightness->count; i++)
1214 seq_printf(seq, " %d", dev->brightness->levels[i]);
1215 seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
1221 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1223 return single_open(file, acpi_video_device_brightness_seq_show,
1228 acpi_video_device_write_brightness(struct file *file,
1229 const char __user * buffer,
1230 size_t count, loff_t * data)
1232 struct seq_file *m = file->private_data;
1233 struct acpi_video_device *dev = m->private;
1234 char str[5] = { 0 };
1235 unsigned int level = 0;
1239 if (!dev || !dev->brightness || count + 1 > sizeof str)
1242 if (copy_from_user(str, buffer, count))
1246 level = simple_strtoul(str, NULL, 0);
1251 /* validate through the list of available levels */
1252 for (i = 2; i < dev->brightness->count; i++)
1253 if (level == dev->brightness->levels[i]) {
1254 if (!acpi_video_device_lcd_set_level(dev, level))
1262 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1264 struct acpi_video_device *dev = seq->private;
1267 union acpi_object *edid = NULL;
1273 status = acpi_video_device_EDID(dev, &edid, 128);
1274 if (ACPI_FAILURE(status)) {
1275 status = acpi_video_device_EDID(dev, &edid, 256);
1278 if (ACPI_FAILURE(status)) {
1282 if (edid && edid->type == ACPI_TYPE_BUFFER) {
1283 for (i = 0; i < edid->buffer.length; i++)
1284 seq_putc(seq, edid->buffer.pointer[i]);
1289 seq_printf(seq, "<not supported>\n");
1297 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1299 return single_open(file, acpi_video_device_EDID_seq_show,
1303 static int acpi_video_device_add_fs(struct acpi_device *device)
1305 struct proc_dir_entry *entry, *device_dir;
1306 struct acpi_video_device *vid_dev;
1308 vid_dev = acpi_driver_data(device);
1312 device_dir = proc_mkdir(acpi_device_bid(device),
1313 vid_dev->video->dir);
1318 entry = proc_create_data("info", S_IRUGO, device_dir,
1319 &acpi_video_device_info_fops, acpi_driver_data(device));
1321 goto err_remove_dir;
1324 entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1326 &acpi_video_device_state_fops,
1327 acpi_driver_data(device));
1329 goto err_remove_info;
1331 /* 'brightness' [R/W] */
1332 entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1334 &acpi_video_device_brightness_fops,
1335 acpi_driver_data(device));
1337 goto err_remove_state;
1340 entry = proc_create_data("EDID", S_IRUGO, device_dir,
1341 &acpi_video_device_EDID_fops,
1342 acpi_driver_data(device));
1344 goto err_remove_brightness;
1346 acpi_device_dir(device) = device_dir;
1350 err_remove_brightness:
1351 remove_proc_entry("brightness", device_dir);
1353 remove_proc_entry("state", device_dir);
1355 remove_proc_entry("info", device_dir);
1357 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1361 static int acpi_video_device_remove_fs(struct acpi_device *device)
1363 struct acpi_video_device *vid_dev;
1364 struct proc_dir_entry *device_dir;
1366 vid_dev = acpi_driver_data(device);
1367 if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1370 device_dir = acpi_device_dir(device);
1372 remove_proc_entry("info", device_dir);
1373 remove_proc_entry("state", device_dir);
1374 remove_proc_entry("brightness", device_dir);
1375 remove_proc_entry("EDID", device_dir);
1376 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1377 acpi_device_dir(device) = NULL;
1384 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1386 struct acpi_video_bus *video = seq->private;
1392 seq_printf(seq, "Switching heads: %s\n",
1393 video->flags.multihead ? "yes" : "no");
1394 seq_printf(seq, "Video ROM: %s\n",
1395 video->flags.rom ? "yes" : "no");
1396 seq_printf(seq, "Device to be POSTed on boot: %s\n",
1397 video->flags.post ? "yes" : "no");
1403 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1405 return single_open(file, acpi_video_bus_info_seq_show,
1409 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1411 struct acpi_video_bus *video = seq->private;
1417 printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1418 seq_printf(seq, "<TODO>\n");
1424 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1426 return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1429 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1431 struct acpi_video_bus *video = seq->private;
1432 unsigned long long options;
1439 status = acpi_video_bus_POST_options(video, &options);
1440 if (ACPI_SUCCESS(status)) {
1441 if (!(options & 1)) {
1442 printk(KERN_WARNING PREFIX
1443 "The motherboard VGA device is not listed as a possible POST device.\n");
1444 printk(KERN_WARNING PREFIX
1445 "This indicates a BIOS bug. Please contact the manufacturer.\n");
1447 printk(KERN_WARNING "%llx\n", options);
1448 seq_printf(seq, "can POST: <integrated video>");
1450 seq_printf(seq, " <PCI video>");
1452 seq_printf(seq, " <AGP video>");
1453 seq_putc(seq, '\n');
1455 seq_printf(seq, "<not supported>\n");
1461 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1463 return single_open(file, acpi_video_bus_POST_info_seq_show,
1467 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1469 struct acpi_video_bus *video = seq->private;
1471 unsigned long long id;
1477 status = acpi_video_bus_get_POST(video, &id);
1478 if (!ACPI_SUCCESS(status)) {
1479 seq_printf(seq, "<not supported>\n");
1482 seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1488 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1490 struct acpi_video_bus *video = seq->private;
1493 seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1498 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1500 return single_open(file, acpi_video_bus_POST_seq_show,
1504 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1506 return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1510 acpi_video_bus_write_POST(struct file *file,
1511 const char __user * buffer,
1512 size_t count, loff_t * data)
1515 struct seq_file *m = file->private_data;
1516 struct acpi_video_bus *video = m->private;
1517 char str[12] = { 0 };
1518 unsigned long long opt, options;
1521 if (!video || count + 1 > sizeof str)
1524 status = acpi_video_bus_POST_options(video, &options);
1525 if (!ACPI_SUCCESS(status))
1528 if (copy_from_user(str, buffer, count))
1532 opt = strtoul(str, NULL, 0);
1536 /* just in case an OEM 'forgot' the motherboard... */
1539 if (options & (1ul << opt)) {
1540 status = acpi_video_bus_set_POST(video, opt);
1541 if (!ACPI_SUCCESS(status))
1550 acpi_video_bus_write_DOS(struct file *file,
1551 const char __user * buffer,
1552 size_t count, loff_t * data)
1555 struct seq_file *m = file->private_data;
1556 struct acpi_video_bus *video = m->private;
1557 char str[12] = { 0 };
1561 if (!video || count + 1 > sizeof str)
1564 if (copy_from_user(str, buffer, count))
1568 opt = strtoul(str, NULL, 0);
1572 status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1574 if (!ACPI_SUCCESS(status))
1580 static int acpi_video_bus_add_fs(struct acpi_device *device)
1582 struct acpi_video_bus *video = acpi_driver_data(device);
1583 struct proc_dir_entry *device_dir;
1584 struct proc_dir_entry *entry;
1586 device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1591 entry = proc_create_data("info", S_IRUGO, device_dir,
1592 &acpi_video_bus_info_fops,
1593 acpi_driver_data(device));
1595 goto err_remove_dir;
1598 entry = proc_create_data("ROM", S_IRUGO, device_dir,
1599 &acpi_video_bus_ROM_fops,
1600 acpi_driver_data(device));
1602 goto err_remove_info;
1604 /* 'POST_info' [R] */
1605 entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1606 &acpi_video_bus_POST_info_fops,
1607 acpi_driver_data(device));
1609 goto err_remove_rom;
1612 entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1614 &acpi_video_bus_POST_fops,
1615 acpi_driver_data(device));
1617 goto err_remove_post_info;
1620 entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1622 &acpi_video_bus_DOS_fops,
1623 acpi_driver_data(device));
1625 goto err_remove_post;
1627 video->dir = acpi_device_dir(device) = device_dir;
1631 remove_proc_entry("POST", device_dir);
1632 err_remove_post_info:
1633 remove_proc_entry("POST_info", device_dir);
1635 remove_proc_entry("ROM", device_dir);
1637 remove_proc_entry("info", device_dir);
1639 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1643 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1645 struct proc_dir_entry *device_dir = acpi_device_dir(device);
1648 remove_proc_entry("info", device_dir);
1649 remove_proc_entry("ROM", device_dir);
1650 remove_proc_entry("POST_info", device_dir);
1651 remove_proc_entry("POST", device_dir);
1652 remove_proc_entry("DOS", device_dir);
1653 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1654 acpi_device_dir(device) = NULL;
1660 /* --------------------------------------------------------------------------
1662 -------------------------------------------------------------------------- */
1664 /* device interface */
1665 static struct acpi_video_device_attrib*
1666 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1668 struct acpi_video_enumerated_device *ids;
1671 for (i = 0; i < video->attached_count; i++) {
1672 ids = &video->attached_array[i];
1673 if ((ids->value.int_val & 0xffff) == device_id)
1674 return &ids->value.attrib;
1681 acpi_video_bus_get_one_device(struct acpi_device *device,
1682 struct acpi_video_bus *video)
1684 unsigned long long device_id;
1686 struct acpi_video_device *data;
1687 struct acpi_video_device_attrib* attribute;
1689 if (!device || !video)
1693 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1694 if (ACPI_SUCCESS(status)) {
1696 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1700 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1701 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1702 device->driver_data = data;
1704 data->device_id = device_id;
1705 data->video = video;
1708 attribute = acpi_video_get_device_attr(video, device_id);
1710 if((attribute != NULL) && attribute->device_id_scheme) {
1711 switch (attribute->display_type) {
1712 case ACPI_VIDEO_DISPLAY_CRT:
1713 data->flags.crt = 1;
1715 case ACPI_VIDEO_DISPLAY_TV:
1716 data->flags.tvout = 1;
1718 case ACPI_VIDEO_DISPLAY_DVI:
1719 data->flags.dvi = 1;
1721 case ACPI_VIDEO_DISPLAY_LCD:
1722 data->flags.lcd = 1;
1725 data->flags.unknown = 1;
1728 if(attribute->bios_can_detect)
1729 data->flags.bios = 1;
1731 data->flags.unknown = 1;
1733 acpi_video_device_bind(video, data);
1734 acpi_video_device_find_cap(data);
1736 status = acpi_install_notify_handler(device->handle,
1738 acpi_video_device_notify,
1740 if (ACPI_FAILURE(status)) {
1741 printk(KERN_ERR PREFIX
1742 "Error installing notify handler\n");
1743 if(data->brightness)
1744 kfree(data->brightness->levels);
1745 kfree(data->brightness);
1750 mutex_lock(&video->device_list_lock);
1751 list_add_tail(&data->entry, &video->video_device_list);
1752 mutex_unlock(&video->device_list_lock);
1754 acpi_video_device_add_fs(device);
1764 * video : video bus device
1769 * Enumerate the video device list of the video bus,
1770 * bind the ids with the corresponding video devices
1771 * under the video bus.
1774 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1776 struct acpi_video_device *dev;
1778 mutex_lock(&video->device_list_lock);
1780 list_for_each_entry(dev, &video->video_device_list, entry)
1781 acpi_video_device_bind(video, dev);
1783 mutex_unlock(&video->device_list_lock);
1788 * video : video bus device
1789 * device : video output device under the video
1795 * Bind the ids with the corresponding video devices
1796 * under the video bus.
1800 acpi_video_device_bind(struct acpi_video_bus *video,
1801 struct acpi_video_device *device)
1803 struct acpi_video_enumerated_device *ids;
1806 for (i = 0; i < video->attached_count; i++) {
1807 ids = &video->attached_array[i];
1808 if (device->device_id == (ids->value.int_val & 0xffff)) {
1809 ids->bind_info = device;
1810 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1817 * video : video bus device
1822 * Call _DOD to enumerate all devices attached to display adapter
1826 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1831 struct acpi_video_enumerated_device *active_list;
1832 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1833 union acpi_object *dod = NULL;
1834 union acpi_object *obj;
1836 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1837 if (!ACPI_SUCCESS(status)) {
1838 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1842 dod = buffer.pointer;
1843 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1844 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1849 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1850 dod->package.count));
1852 active_list = kcalloc(1 + dod->package.count,
1853 sizeof(struct acpi_video_enumerated_device),
1861 for (i = 0; i < dod->package.count; i++) {
1862 obj = &dod->package.elements[i];
1864 if (obj->type != ACPI_TYPE_INTEGER) {
1865 printk(KERN_ERR PREFIX
1866 "Invalid _DOD data in element %d\n", i);
1870 active_list[count].value.int_val = obj->integer.value;
1871 active_list[count].bind_info = NULL;
1872 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1873 (int)obj->integer.value));
1877 kfree(video->attached_array);
1879 video->attached_array = active_list;
1880 video->attached_count = count;
1883 kfree(buffer.pointer);
1888 acpi_video_get_next_level(struct acpi_video_device *device,
1889 u32 level_current, u32 event)
1891 int min, max, min_above, max_below, i, l, delta = 255;
1892 max = max_below = 0;
1893 min = min_above = 255;
1894 /* Find closest level to level_current */
1895 for (i = 2; i < device->brightness->count; i++) {
1896 l = device->brightness->levels[i];
1897 if (abs(l - level_current) < abs(delta)) {
1898 delta = l - level_current;
1903 /* Ajust level_current to closest available level */
1904 level_current += delta;
1905 for (i = 2; i < device->brightness->count; i++) {
1906 l = device->brightness->levels[i];
1911 if (l < min_above && l > level_current)
1913 if (l > max_below && l < level_current)
1918 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1919 return (level_current < max) ? min_above : min;
1920 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1921 return (level_current < max) ? min_above : max;
1922 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1923 return (level_current > min) ? max_below : min;
1924 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1925 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1928 return level_current;
1933 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1935 unsigned long long level_current, level_next;
1936 int result = -EINVAL;
1938 if (!device->brightness)
1941 result = acpi_video_device_lcd_get_level_current(device,
1946 level_next = acpi_video_get_next_level(device, level_current, event);
1948 result = acpi_video_device_lcd_set_level(device, level_next);
1952 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1958 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1959 struct acpi_device *device)
1962 struct acpi_device *dev;
1964 acpi_video_device_enumerate(video);
1966 list_for_each_entry(dev, &device->children, node) {
1968 status = acpi_video_bus_get_one_device(dev, video);
1969 if (ACPI_FAILURE(status)) {
1970 printk(KERN_WARNING PREFIX
1971 "Cant attach device");
1978 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1981 struct acpi_video_bus *video;
1984 if (!device || !device->video)
1987 video = device->video;
1989 acpi_video_device_remove_fs(device->dev);
1991 status = acpi_remove_notify_handler(device->dev->handle,
1993 acpi_video_device_notify);
1994 backlight_device_unregister(device->backlight);
1996 sysfs_remove_link(&device->dev->dev.kobj,
1998 sysfs_remove_link(&device->cdev->device.kobj,
2000 thermal_cooling_device_unregister(device->cdev);
2001 device->cdev = NULL;
2003 video_output_unregister(device->output_dev);
2008 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2011 struct acpi_video_device *dev, *next;
2013 mutex_lock(&video->device_list_lock);
2015 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2017 status = acpi_video_bus_put_one_device(dev);
2018 if (ACPI_FAILURE(status))
2019 printk(KERN_WARNING PREFIX
2020 "hhuuhhuu bug in acpi video driver.\n");
2022 if (dev->brightness) {
2023 kfree(dev->brightness->levels);
2024 kfree(dev->brightness);
2026 list_del(&dev->entry);
2030 mutex_unlock(&video->device_list_lock);
2035 /* acpi_video interface */
2037 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
2039 return acpi_video_bus_DOS(video, 0, 0);
2042 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
2044 return acpi_video_bus_DOS(video, 0, 1);
2047 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
2049 struct acpi_video_bus *video = acpi_driver_data(device);
2050 struct input_dev *input;
2056 input = video->input;
2059 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
2060 * most likely via hotkey. */
2061 acpi_bus_generate_proc_event(device, event, 0);
2062 keycode = KEY_SWITCHVIDEOMODE;
2065 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
2067 acpi_video_device_enumerate(video);
2068 acpi_video_device_rebind(video);
2069 acpi_bus_generate_proc_event(device, event, 0);
2070 keycode = KEY_SWITCHVIDEOMODE;
2073 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
2074 acpi_bus_generate_proc_event(device, event, 0);
2075 keycode = KEY_SWITCHVIDEOMODE;
2077 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
2078 acpi_bus_generate_proc_event(device, event, 0);
2079 keycode = KEY_VIDEO_NEXT;
2081 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
2082 acpi_bus_generate_proc_event(device, event, 0);
2083 keycode = KEY_VIDEO_PREV;
2087 keycode = KEY_UNKNOWN;
2088 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2089 "Unsupported event [0x%x]\n", event));
2093 acpi_notifier_call_chain(device, event, 0);
2094 input_report_key(input, keycode, 1);
2096 input_report_key(input, keycode, 0);
2102 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
2104 struct acpi_video_device *video_device = data;
2105 struct acpi_device *device = NULL;
2106 struct acpi_video_bus *bus;
2107 struct input_dev *input;
2113 device = video_device->dev;
2114 bus = video_device->video;
2118 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
2119 if (brightness_switch_enabled)
2120 acpi_video_switch_brightness(video_device, event);
2121 acpi_bus_generate_proc_event(device, event, 0);
2122 keycode = KEY_BRIGHTNESS_CYCLE;
2124 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
2125 if (brightness_switch_enabled)
2126 acpi_video_switch_brightness(video_device, event);
2127 acpi_bus_generate_proc_event(device, event, 0);
2128 keycode = KEY_BRIGHTNESSUP;
2130 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
2131 if (brightness_switch_enabled)
2132 acpi_video_switch_brightness(video_device, event);
2133 acpi_bus_generate_proc_event(device, event, 0);
2134 keycode = KEY_BRIGHTNESSDOWN;
2136 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
2137 if (brightness_switch_enabled)
2138 acpi_video_switch_brightness(video_device, event);
2139 acpi_bus_generate_proc_event(device, event, 0);
2140 keycode = KEY_BRIGHTNESS_ZERO;
2142 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
2143 if (brightness_switch_enabled)
2144 acpi_video_switch_brightness(video_device, event);
2145 acpi_bus_generate_proc_event(device, event, 0);
2146 keycode = KEY_DISPLAY_OFF;
2149 keycode = KEY_UNKNOWN;
2150 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2151 "Unsupported event [0x%x]\n", event));
2155 acpi_notifier_call_chain(device, event, 0);
2156 input_report_key(input, keycode, 1);
2158 input_report_key(input, keycode, 0);
2164 static int instance;
2165 static int acpi_video_resume(struct acpi_device *device)
2167 struct acpi_video_bus *video;
2168 struct acpi_video_device *video_device;
2171 if (!device || !acpi_driver_data(device))
2174 video = acpi_driver_data(device);
2176 for (i = 0; i < video->attached_count; i++) {
2177 video_device = video->attached_array[i].bind_info;
2178 if (video_device && video_device->backlight)
2179 acpi_video_set_brightness(video_device->backlight);
2184 static int acpi_video_bus_add(struct acpi_device *device)
2186 struct acpi_video_bus *video;
2187 struct input_dev *input;
2190 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2194 /* a hack to fix the duplicate name "VID" problem on T61 */
2195 if (!strcmp(device->pnp.bus_id, "VID")) {
2197 device->pnp.bus_id[3] = '0' + instance;
2200 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2201 if (!strcmp(device->pnp.bus_id, "VGA")) {
2203 device->pnp.bus_id[3] = '0' + instance;
2207 video->device = device;
2208 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2209 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2210 device->driver_data = video;
2212 acpi_video_bus_find_cap(video);
2213 error = acpi_video_bus_check(video);
2215 goto err_free_video;
2217 error = acpi_video_bus_add_fs(device);
2219 goto err_free_video;
2221 mutex_init(&video->device_list_lock);
2222 INIT_LIST_HEAD(&video->video_device_list);
2224 acpi_video_bus_get_devices(video, device);
2225 acpi_video_bus_start_devices(video);
2227 video->input = input = input_allocate_device();
2230 goto err_stop_video;
2233 snprintf(video->phys, sizeof(video->phys),
2234 "%s/video/input0", acpi_device_hid(video->device));
2236 input->name = acpi_device_name(video->device);
2237 input->phys = video->phys;
2238 input->id.bustype = BUS_HOST;
2239 input->id.product = 0x06;
2240 input->dev.parent = &device->dev;
2241 input->evbit[0] = BIT(EV_KEY);
2242 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2243 set_bit(KEY_VIDEO_NEXT, input->keybit);
2244 set_bit(KEY_VIDEO_PREV, input->keybit);
2245 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2246 set_bit(KEY_BRIGHTNESSUP, input->keybit);
2247 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2248 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2249 set_bit(KEY_DISPLAY_OFF, input->keybit);
2250 set_bit(KEY_UNKNOWN, input->keybit);
2252 error = input_register_device(input);
2254 goto err_free_input_dev;
2256 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
2257 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2258 video->flags.multihead ? "yes" : "no",
2259 video->flags.rom ? "yes" : "no",
2260 video->flags.post ? "yes" : "no");
2265 input_free_device(input);
2267 acpi_video_bus_stop_devices(video);
2268 acpi_video_bus_put_devices(video);
2269 kfree(video->attached_array);
2270 acpi_video_bus_remove_fs(device);
2273 device->driver_data = NULL;
2278 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2280 struct acpi_video_bus *video = NULL;
2283 if (!device || !acpi_driver_data(device))
2286 video = acpi_driver_data(device);
2288 acpi_video_bus_stop_devices(video);
2289 acpi_video_bus_put_devices(video);
2290 acpi_video_bus_remove_fs(device);
2292 input_unregister_device(video->input);
2293 kfree(video->attached_array);
2299 static int __init intel_opregion_present(void)
2301 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
2302 struct pci_dev *dev = NULL;
2305 for_each_pci_dev(dev) {
2306 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2308 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2310 pci_read_config_dword(dev, 0xfc, &address);
2319 int acpi_video_register(void)
2322 if (register_count) {
2324 * if the function of acpi_video_register is already called,
2325 * don't register the acpi_vide_bus again and return no error.
2330 acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2331 if (!acpi_video_dir)
2334 result = acpi_bus_register_driver(&acpi_video_bus);
2336 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2341 * When the acpi_video_bus is loaded successfully, increase
2342 * the counter reference.
2348 EXPORT_SYMBOL(acpi_video_register);
2350 void acpi_video_unregister(void)
2352 if (!register_count) {
2354 * If the acpi video bus is already unloaded, don't
2355 * unload it again and return directly.
2359 acpi_bus_unregister_driver(&acpi_video_bus);
2361 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2367 EXPORT_SYMBOL(acpi_video_unregister);
2370 * This is kind of nasty. Hardware using Intel chipsets may require
2371 * the video opregion code to be run first in order to initialise
2372 * state before any ACPI video calls are made. To handle this we defer
2373 * registration of the video class until the opregion code has run.
2376 static int __init acpi_video_init(void)
2378 dmi_check_system(video_dmi_table);
2380 if (intel_opregion_present())
2383 return acpi_video_register();
2386 static void __exit acpi_video_exit(void)
2388 acpi_video_unregister();
2393 module_init(acpi_video_init);
2394 module_exit(acpi_video_exit);