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 *cooling_dev;
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 *cooling_dev, unsigned
393 struct acpi_device *device = cooling_dev->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 *cooling_dev, unsigned
403 struct acpi_device *device = cooling_dev->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 *cooling_dev, unsigned long state)
422 struct acpi_device *device = cooling_dev->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"),
591 .callback = video_set_bqc_offset,
592 .ident = "Acer Aspire 7720",
594 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
595 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
602 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
603 unsigned long long *level)
605 acpi_status status = AE_OK;
608 if (device->cap._BQC || device->cap._BCQ) {
609 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
611 status = acpi_evaluate_integer(device->dev->handle, buf,
613 if (ACPI_SUCCESS(status)) {
614 if (device->brightness->flags._BQC_use_index) {
615 if (device->brightness->flags._BCL_reversed)
616 *level = device->brightness->count
618 *level = device->brightness->levels[*level + 2];
621 *level += bqc_offset_aml_bug_workaround;
622 for (i = 2; i < device->brightness->count; i++)
623 if (device->brightness->levels[i] == *level) {
624 device->brightness->curr = *level;
627 /* BQC returned an invalid level. Stop using it. */
628 ACPI_WARNING((AE_INFO, "%s returned an invalid level",
630 device->cap._BQC = device->cap._BCQ = 0;
633 * should we return an error or ignore this failure?
634 * dev->brightness->curr is a cached value which stores
635 * the correct current backlight level in most cases.
636 * ACPI video backlight still works w/ buggy _BQC.
637 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
639 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
640 device->cap._BQC = device->cap._BCQ = 0;
644 *level = device->brightness->curr;
649 acpi_video_device_EDID(struct acpi_video_device *device,
650 union acpi_object **edid, ssize_t length)
653 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
654 union acpi_object *obj;
655 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
656 struct acpi_object_list args = { 1, &arg0 };
664 arg0.integer.value = 1;
665 else if (length == 256)
666 arg0.integer.value = 2;
670 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
671 if (ACPI_FAILURE(status))
674 obj = buffer.pointer;
676 if (obj && obj->type == ACPI_TYPE_BUFFER)
679 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
690 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
693 unsigned long long tmp;
694 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
695 struct acpi_object_list args = { 1, &arg0 };
698 arg0.integer.value = option;
700 status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
701 if (ACPI_SUCCESS(status))
702 status = tmp ? (-EINVAL) : (AE_OK);
708 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long long *id)
712 status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
718 acpi_video_bus_POST_options(struct acpi_video_bus *video,
719 unsigned long long *options)
723 status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
731 * video : video bus device pointer
733 * 0. The system BIOS should NOT automatically switch(toggle)
734 * the active display output.
735 * 1. The system BIOS should automatically switch (toggle) the
736 * active display output. No switch event.
737 * 2. The _DGS value should be locked.
738 * 3. The system BIOS should not automatically switch (toggle) the
739 * active display output, but instead generate the display switch
742 * 0. The system BIOS should automatically control the brightness level
743 * of the LCD when the power changes from AC to DC
744 * 1. The system BIOS should NOT automatically control the brightness
745 * level of the LCD when the power changes from AC to DC.
751 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
753 acpi_integer status = 0;
754 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
755 struct acpi_object_list args = { 1, &arg0 };
758 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
762 arg0.integer.value = (lcd_flag << 2) | bios_flag;
763 video->dos_setting = arg0.integer.value;
764 acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
771 * Simple comparison function used to sort backlight levels.
775 acpi_video_cmp_level(const void *a, const void *b)
777 return *(int *)a - *(int *)b;
782 * device : video output device (LCD, CRT, ..)
785 * Maximum brightness level
787 * Allocate and initialize device->brightness.
791 acpi_video_init_brightness(struct acpi_video_device *device)
793 union acpi_object *obj = NULL;
794 int i, max_level = 0, count = 0, level_ac_battery = 0;
795 unsigned long long level, level_old;
796 union acpi_object *o;
797 struct acpi_video_device_brightness *br = NULL;
798 int result = -EINVAL;
800 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
801 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
802 "LCD brightness level\n"));
806 if (obj->package.count < 2)
809 br = kzalloc(sizeof(*br), GFP_KERNEL);
811 printk(KERN_ERR "can't allocate memory\n");
816 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
823 for (i = 0; i < obj->package.count; i++) {
824 o = (union acpi_object *)&obj->package.elements[i];
825 if (o->type != ACPI_TYPE_INTEGER) {
826 printk(KERN_ERR PREFIX "Invalid data\n");
829 br->levels[count] = (u32) o->integer.value;
831 if (br->levels[count] > max_level)
832 max_level = br->levels[count];
837 * some buggy BIOS don't export the levels
838 * when machine is on AC/Battery in _BCL package.
839 * In this case, the first two elements in _BCL packages
840 * are also supported brightness levels that OS should take care of.
842 for (i = 2; i < count; i++) {
843 if (br->levels[i] == br->levels[0])
845 if (br->levels[i] == br->levels[1])
849 if (level_ac_battery < 2) {
850 level_ac_battery = 2 - level_ac_battery;
851 br->flags._BCL_no_ac_battery_levels = 1;
852 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
853 br->levels[i] = br->levels[i - level_ac_battery];
854 count += level_ac_battery;
855 } else if (level_ac_battery > 2)
856 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
858 /* Check if the _BCL package is in a reversed order */
859 if (max_level == br->levels[2]) {
860 br->flags._BCL_reversed = 1;
861 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
862 acpi_video_cmp_level, NULL);
863 } else if (max_level != br->levels[count - 1])
865 "Found unordered _BCL package\n"));
868 device->brightness = br;
870 /* Check the input/output of _BQC/_BCL/_BCM */
871 if ((max_level < 100) && (max_level <= (count - 2)))
872 br->flags._BCL_use_index = 1;
875 * _BCM is always consistent with _BCL,
876 * at least for all the laptops we have ever seen.
878 br->flags._BCM_use_index = br->flags._BCL_use_index;
880 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
881 br->curr = level_old = max_level;
883 if (!device->cap._BQC)
886 result = acpi_video_device_lcd_get_level_current(device, &level_old);
888 goto out_free_levels;
891 * Set the level to maximum and check if _BQC uses indexed value
893 result = acpi_video_device_lcd_set_level(device, max_level);
895 goto out_free_levels;
897 result = acpi_video_device_lcd_get_level_current(device, &level);
899 goto out_free_levels;
901 br->flags._BQC_use_index = (level == max_level ? 0 : 1);
903 if (!br->flags._BQC_use_index)
906 if (br->flags._BCL_reversed)
907 level_old = (br->count - 1) - level_old;
908 level_old = br->levels[level_old];
911 result = acpi_video_device_lcd_set_level(device, level_old);
913 goto out_free_levels;
915 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
916 "found %d brightness levels\n", count - 2));
925 device->brightness = NULL;
932 * device : video output device (LCD, CRT, ..)
937 * Find out all required AML methods defined under the output
941 static void acpi_video_device_find_cap(struct acpi_video_device *device)
943 acpi_handle h_dummy1;
945 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
946 device->cap._ADR = 1;
948 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
949 device->cap._BCL = 1;
951 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
952 device->cap._BCM = 1;
954 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
955 device->cap._BQC = 1;
956 else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
958 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
959 device->cap._BCQ = 1;
962 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
963 device->cap._DDC = 1;
965 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
966 device->cap._DCS = 1;
968 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
969 device->cap._DGS = 1;
971 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
972 device->cap._DSS = 1;
975 if (acpi_video_backlight_support()) {
977 static int count = 0;
980 result = acpi_video_init_brightness(device);
983 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
987 sprintf(name, "acpi_video%d", count++);
988 device->backlight = backlight_device_register(name,
989 NULL, device, &acpi_backlight_ops);
990 device->backlight->props.max_brightness = device->brightness->count-3;
993 result = sysfs_create_link(&device->backlight->dev.kobj,
994 &device->dev->dev.kobj, "device");
996 printk(KERN_ERR PREFIX "Create sysfs link\n");
998 device->cooling_dev = thermal_cooling_device_register("LCD",
999 device->dev, &video_cooling_ops);
1000 if (IS_ERR(device->cooling_dev)) {
1002 * Set cooling_dev to NULL so we don't crash trying to
1004 * Also, why the hell we are returning early and
1005 * not attempt to register video output if cooling
1006 * device registration failed?
1009 device->cooling_dev = NULL;
1013 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1014 device->cooling_dev->id);
1015 result = sysfs_create_link(&device->dev->dev.kobj,
1016 &device->cooling_dev->device.kobj,
1019 printk(KERN_ERR PREFIX "Create sysfs link\n");
1020 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1021 &device->dev->dev.kobj, "device");
1023 printk(KERN_ERR PREFIX "Create sysfs link\n");
1027 if (acpi_video_display_switch_support()) {
1029 if (device->cap._DCS && device->cap._DSS) {
1032 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
1035 sprintf(name, "acpi_video%d", count++);
1036 device->output_dev = video_output_register(name,
1037 NULL, device, &acpi_output_properties);
1045 * device : video output device (VGA)
1050 * Find out all required AML methods defined under the video bus device.
1053 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1055 acpi_handle h_dummy1;
1057 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
1058 video->cap._DOS = 1;
1060 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
1061 video->cap._DOD = 1;
1063 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
1064 video->cap._ROM = 1;
1066 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
1067 video->cap._GPD = 1;
1069 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
1070 video->cap._SPD = 1;
1072 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
1073 video->cap._VPO = 1;
1078 * Check whether the video bus device has required AML method to
1079 * support the desired features
1082 static int acpi_video_bus_check(struct acpi_video_bus *video)
1084 acpi_status status = -ENOENT;
1085 struct pci_dev *dev;
1090 dev = acpi_get_pci_dev(video->device->handle);
1095 /* Since there is no HID, CID and so on for VGA driver, we have
1096 * to check well known required nodes.
1099 /* Does this device support video switching? */
1100 if (video->cap._DOS) {
1101 video->flags.multihead = 1;
1105 /* Does this device support retrieving a video ROM? */
1106 if (video->cap._ROM) {
1107 video->flags.rom = 1;
1111 /* Does this device support configuring which video device to POST? */
1112 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1113 video->flags.post = 1;
1120 /* --------------------------------------------------------------------------
1121 FS Interface (/proc)
1122 -------------------------------------------------------------------------- */
1124 static struct proc_dir_entry *acpi_video_dir;
1128 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
1130 struct acpi_video_device *dev = seq->private;
1136 seq_printf(seq, "device_id: 0x%04x\n", (u32) dev->device_id);
1137 seq_printf(seq, "type: ");
1139 seq_printf(seq, "CRT\n");
1140 else if (dev->flags.lcd)
1141 seq_printf(seq, "LCD\n");
1142 else if (dev->flags.tvout)
1143 seq_printf(seq, "TVOUT\n");
1144 else if (dev->flags.dvi)
1145 seq_printf(seq, "DVI\n");
1147 seq_printf(seq, "UNKNOWN\n");
1149 seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
1156 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
1158 return single_open(file, acpi_video_device_info_seq_show,
1162 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
1165 struct acpi_video_device *dev = seq->private;
1166 unsigned long long state;
1172 status = acpi_video_device_get_state(dev, &state);
1173 seq_printf(seq, "state: ");
1174 if (ACPI_SUCCESS(status))
1175 seq_printf(seq, "0x%02llx\n", state);
1177 seq_printf(seq, "<not supported>\n");
1179 status = acpi_video_device_query(dev, &state);
1180 seq_printf(seq, "query: ");
1181 if (ACPI_SUCCESS(status))
1182 seq_printf(seq, "0x%02llx\n", state);
1184 seq_printf(seq, "<not supported>\n");
1191 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
1193 return single_open(file, acpi_video_device_state_seq_show,
1198 acpi_video_device_write_state(struct file *file,
1199 const char __user * buffer,
1200 size_t count, loff_t * data)
1203 struct seq_file *m = file->private_data;
1204 struct acpi_video_device *dev = m->private;
1205 char str[12] = { 0 };
1209 if (!dev || count + 1 > sizeof str)
1212 if (copy_from_user(str, buffer, count))
1216 state = simple_strtoul(str, NULL, 0);
1217 state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
1219 status = acpi_video_device_set_state(dev, state);
1228 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
1230 struct acpi_video_device *dev = seq->private;
1234 if (!dev || !dev->brightness) {
1235 seq_printf(seq, "<not supported>\n");
1239 seq_printf(seq, "levels: ");
1240 for (i = 2; i < dev->brightness->count; i++)
1241 seq_printf(seq, " %d", dev->brightness->levels[i]);
1242 seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
1248 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1250 return single_open(file, acpi_video_device_brightness_seq_show,
1255 acpi_video_device_write_brightness(struct file *file,
1256 const char __user * buffer,
1257 size_t count, loff_t * data)
1259 struct seq_file *m = file->private_data;
1260 struct acpi_video_device *dev = m->private;
1261 char str[5] = { 0 };
1262 unsigned int level = 0;
1266 if (!dev || !dev->brightness || count + 1 > sizeof str)
1269 if (copy_from_user(str, buffer, count))
1273 level = simple_strtoul(str, NULL, 0);
1278 /* validate through the list of available levels */
1279 for (i = 2; i < dev->brightness->count; i++)
1280 if (level == dev->brightness->levels[i]) {
1281 if (!acpi_video_device_lcd_set_level(dev, level))
1289 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1291 struct acpi_video_device *dev = seq->private;
1294 union acpi_object *edid = NULL;
1300 status = acpi_video_device_EDID(dev, &edid, 128);
1301 if (ACPI_FAILURE(status)) {
1302 status = acpi_video_device_EDID(dev, &edid, 256);
1305 if (ACPI_FAILURE(status)) {
1309 if (edid && edid->type == ACPI_TYPE_BUFFER) {
1310 for (i = 0; i < edid->buffer.length; i++)
1311 seq_putc(seq, edid->buffer.pointer[i]);
1316 seq_printf(seq, "<not supported>\n");
1324 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1326 return single_open(file, acpi_video_device_EDID_seq_show,
1330 static int acpi_video_device_add_fs(struct acpi_device *device)
1332 struct proc_dir_entry *entry, *device_dir;
1333 struct acpi_video_device *vid_dev;
1335 vid_dev = acpi_driver_data(device);
1339 device_dir = proc_mkdir(acpi_device_bid(device),
1340 vid_dev->video->dir);
1345 entry = proc_create_data("info", S_IRUGO, device_dir,
1346 &acpi_video_device_info_fops, acpi_driver_data(device));
1348 goto err_remove_dir;
1351 entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1353 &acpi_video_device_state_fops,
1354 acpi_driver_data(device));
1356 goto err_remove_info;
1358 /* 'brightness' [R/W] */
1359 entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1361 &acpi_video_device_brightness_fops,
1362 acpi_driver_data(device));
1364 goto err_remove_state;
1367 entry = proc_create_data("EDID", S_IRUGO, device_dir,
1368 &acpi_video_device_EDID_fops,
1369 acpi_driver_data(device));
1371 goto err_remove_brightness;
1373 acpi_device_dir(device) = device_dir;
1377 err_remove_brightness:
1378 remove_proc_entry("brightness", device_dir);
1380 remove_proc_entry("state", device_dir);
1382 remove_proc_entry("info", device_dir);
1384 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1388 static int acpi_video_device_remove_fs(struct acpi_device *device)
1390 struct acpi_video_device *vid_dev;
1391 struct proc_dir_entry *device_dir;
1393 vid_dev = acpi_driver_data(device);
1394 if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1397 device_dir = acpi_device_dir(device);
1399 remove_proc_entry("info", device_dir);
1400 remove_proc_entry("state", device_dir);
1401 remove_proc_entry("brightness", device_dir);
1402 remove_proc_entry("EDID", device_dir);
1403 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1404 acpi_device_dir(device) = NULL;
1411 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1413 struct acpi_video_bus *video = seq->private;
1419 seq_printf(seq, "Switching heads: %s\n",
1420 video->flags.multihead ? "yes" : "no");
1421 seq_printf(seq, "Video ROM: %s\n",
1422 video->flags.rom ? "yes" : "no");
1423 seq_printf(seq, "Device to be POSTed on boot: %s\n",
1424 video->flags.post ? "yes" : "no");
1430 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1432 return single_open(file, acpi_video_bus_info_seq_show,
1436 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1438 struct acpi_video_bus *video = seq->private;
1444 printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1445 seq_printf(seq, "<TODO>\n");
1451 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1453 return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1456 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1458 struct acpi_video_bus *video = seq->private;
1459 unsigned long long options;
1466 status = acpi_video_bus_POST_options(video, &options);
1467 if (ACPI_SUCCESS(status)) {
1468 if (!(options & 1)) {
1469 printk(KERN_WARNING PREFIX
1470 "The motherboard VGA device is not listed as a possible POST device.\n");
1471 printk(KERN_WARNING PREFIX
1472 "This indicates a BIOS bug. Please contact the manufacturer.\n");
1474 printk(KERN_WARNING "%llx\n", options);
1475 seq_printf(seq, "can POST: <integrated video>");
1477 seq_printf(seq, " <PCI video>");
1479 seq_printf(seq, " <AGP video>");
1480 seq_putc(seq, '\n');
1482 seq_printf(seq, "<not supported>\n");
1488 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1490 return single_open(file, acpi_video_bus_POST_info_seq_show,
1494 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1496 struct acpi_video_bus *video = seq->private;
1498 unsigned long long id;
1504 status = acpi_video_bus_get_POST(video, &id);
1505 if (!ACPI_SUCCESS(status)) {
1506 seq_printf(seq, "<not supported>\n");
1509 seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1515 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1517 struct acpi_video_bus *video = seq->private;
1520 seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1525 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1527 return single_open(file, acpi_video_bus_POST_seq_show,
1531 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1533 return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1537 acpi_video_bus_write_POST(struct file *file,
1538 const char __user * buffer,
1539 size_t count, loff_t * data)
1542 struct seq_file *m = file->private_data;
1543 struct acpi_video_bus *video = m->private;
1544 char str[12] = { 0 };
1545 unsigned long long opt, options;
1548 if (!video || count + 1 > sizeof str)
1551 status = acpi_video_bus_POST_options(video, &options);
1552 if (!ACPI_SUCCESS(status))
1555 if (copy_from_user(str, buffer, count))
1559 opt = strtoul(str, NULL, 0);
1563 /* just in case an OEM 'forgot' the motherboard... */
1566 if (options & (1ul << opt)) {
1567 status = acpi_video_bus_set_POST(video, opt);
1568 if (!ACPI_SUCCESS(status))
1577 acpi_video_bus_write_DOS(struct file *file,
1578 const char __user * buffer,
1579 size_t count, loff_t * data)
1582 struct seq_file *m = file->private_data;
1583 struct acpi_video_bus *video = m->private;
1584 char str[12] = { 0 };
1588 if (!video || count + 1 > sizeof str)
1591 if (copy_from_user(str, buffer, count))
1595 opt = strtoul(str, NULL, 0);
1599 status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1601 if (!ACPI_SUCCESS(status))
1607 static int acpi_video_bus_add_fs(struct acpi_device *device)
1609 struct acpi_video_bus *video = acpi_driver_data(device);
1610 struct proc_dir_entry *device_dir;
1611 struct proc_dir_entry *entry;
1613 device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1618 entry = proc_create_data("info", S_IRUGO, device_dir,
1619 &acpi_video_bus_info_fops,
1620 acpi_driver_data(device));
1622 goto err_remove_dir;
1625 entry = proc_create_data("ROM", S_IRUGO, device_dir,
1626 &acpi_video_bus_ROM_fops,
1627 acpi_driver_data(device));
1629 goto err_remove_info;
1631 /* 'POST_info' [R] */
1632 entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1633 &acpi_video_bus_POST_info_fops,
1634 acpi_driver_data(device));
1636 goto err_remove_rom;
1639 entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1641 &acpi_video_bus_POST_fops,
1642 acpi_driver_data(device));
1644 goto err_remove_post_info;
1647 entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1649 &acpi_video_bus_DOS_fops,
1650 acpi_driver_data(device));
1652 goto err_remove_post;
1654 video->dir = acpi_device_dir(device) = device_dir;
1658 remove_proc_entry("POST", device_dir);
1659 err_remove_post_info:
1660 remove_proc_entry("POST_info", device_dir);
1662 remove_proc_entry("ROM", device_dir);
1664 remove_proc_entry("info", device_dir);
1666 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1670 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1672 struct proc_dir_entry *device_dir = acpi_device_dir(device);
1675 remove_proc_entry("info", device_dir);
1676 remove_proc_entry("ROM", device_dir);
1677 remove_proc_entry("POST_info", device_dir);
1678 remove_proc_entry("POST", device_dir);
1679 remove_proc_entry("DOS", device_dir);
1680 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1681 acpi_device_dir(device) = NULL;
1687 /* --------------------------------------------------------------------------
1689 -------------------------------------------------------------------------- */
1691 /* device interface */
1692 static struct acpi_video_device_attrib*
1693 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1695 struct acpi_video_enumerated_device *ids;
1698 for (i = 0; i < video->attached_count; i++) {
1699 ids = &video->attached_array[i];
1700 if ((ids->value.int_val & 0xffff) == device_id)
1701 return &ids->value.attrib;
1708 acpi_video_bus_get_one_device(struct acpi_device *device,
1709 struct acpi_video_bus *video)
1711 unsigned long long device_id;
1713 struct acpi_video_device *data;
1714 struct acpi_video_device_attrib* attribute;
1716 if (!device || !video)
1720 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1721 if (ACPI_SUCCESS(status)) {
1723 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1727 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1728 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1729 device->driver_data = data;
1731 data->device_id = device_id;
1732 data->video = video;
1735 attribute = acpi_video_get_device_attr(video, device_id);
1737 if((attribute != NULL) && attribute->device_id_scheme) {
1738 switch (attribute->display_type) {
1739 case ACPI_VIDEO_DISPLAY_CRT:
1740 data->flags.crt = 1;
1742 case ACPI_VIDEO_DISPLAY_TV:
1743 data->flags.tvout = 1;
1745 case ACPI_VIDEO_DISPLAY_DVI:
1746 data->flags.dvi = 1;
1748 case ACPI_VIDEO_DISPLAY_LCD:
1749 data->flags.lcd = 1;
1752 data->flags.unknown = 1;
1755 if(attribute->bios_can_detect)
1756 data->flags.bios = 1;
1758 data->flags.unknown = 1;
1760 acpi_video_device_bind(video, data);
1761 acpi_video_device_find_cap(data);
1763 status = acpi_install_notify_handler(device->handle,
1765 acpi_video_device_notify,
1767 if (ACPI_FAILURE(status)) {
1768 printk(KERN_ERR PREFIX
1769 "Error installing notify handler\n");
1770 if(data->brightness)
1771 kfree(data->brightness->levels);
1772 kfree(data->brightness);
1777 mutex_lock(&video->device_list_lock);
1778 list_add_tail(&data->entry, &video->video_device_list);
1779 mutex_unlock(&video->device_list_lock);
1781 acpi_video_device_add_fs(device);
1791 * video : video bus device
1796 * Enumerate the video device list of the video bus,
1797 * bind the ids with the corresponding video devices
1798 * under the video bus.
1801 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1803 struct acpi_video_device *dev;
1805 mutex_lock(&video->device_list_lock);
1807 list_for_each_entry(dev, &video->video_device_list, entry)
1808 acpi_video_device_bind(video, dev);
1810 mutex_unlock(&video->device_list_lock);
1815 * video : video bus device
1816 * device : video output device under the video
1822 * Bind the ids with the corresponding video devices
1823 * under the video bus.
1827 acpi_video_device_bind(struct acpi_video_bus *video,
1828 struct acpi_video_device *device)
1830 struct acpi_video_enumerated_device *ids;
1833 for (i = 0; i < video->attached_count; i++) {
1834 ids = &video->attached_array[i];
1835 if (device->device_id == (ids->value.int_val & 0xffff)) {
1836 ids->bind_info = device;
1837 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1844 * video : video bus device
1849 * Call _DOD to enumerate all devices attached to display adapter
1853 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1858 struct acpi_video_enumerated_device *active_list;
1859 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1860 union acpi_object *dod = NULL;
1861 union acpi_object *obj;
1863 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1864 if (!ACPI_SUCCESS(status)) {
1865 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1869 dod = buffer.pointer;
1870 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1871 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1876 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1877 dod->package.count));
1879 active_list = kcalloc(1 + dod->package.count,
1880 sizeof(struct acpi_video_enumerated_device),
1888 for (i = 0; i < dod->package.count; i++) {
1889 obj = &dod->package.elements[i];
1891 if (obj->type != ACPI_TYPE_INTEGER) {
1892 printk(KERN_ERR PREFIX
1893 "Invalid _DOD data in element %d\n", i);
1897 active_list[count].value.int_val = obj->integer.value;
1898 active_list[count].bind_info = NULL;
1899 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1900 (int)obj->integer.value));
1904 kfree(video->attached_array);
1906 video->attached_array = active_list;
1907 video->attached_count = count;
1910 kfree(buffer.pointer);
1915 acpi_video_get_next_level(struct acpi_video_device *device,
1916 u32 level_current, u32 event)
1918 int min, max, min_above, max_below, i, l, delta = 255;
1919 max = max_below = 0;
1920 min = min_above = 255;
1921 /* Find closest level to level_current */
1922 for (i = 2; i < device->brightness->count; i++) {
1923 l = device->brightness->levels[i];
1924 if (abs(l - level_current) < abs(delta)) {
1925 delta = l - level_current;
1930 /* Ajust level_current to closest available level */
1931 level_current += delta;
1932 for (i = 2; i < device->brightness->count; i++) {
1933 l = device->brightness->levels[i];
1938 if (l < min_above && l > level_current)
1940 if (l > max_below && l < level_current)
1945 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1946 return (level_current < max) ? min_above : min;
1947 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1948 return (level_current < max) ? min_above : max;
1949 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1950 return (level_current > min) ? max_below : min;
1951 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1952 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1955 return level_current;
1960 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1962 unsigned long long level_current, level_next;
1963 int result = -EINVAL;
1965 if (!device->brightness)
1968 result = acpi_video_device_lcd_get_level_current(device,
1973 level_next = acpi_video_get_next_level(device, level_current, event);
1975 result = acpi_video_device_lcd_set_level(device, level_next);
1979 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1985 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1986 struct acpi_device *device)
1989 struct acpi_device *dev;
1991 acpi_video_device_enumerate(video);
1993 list_for_each_entry(dev, &device->children, node) {
1995 status = acpi_video_bus_get_one_device(dev, video);
1996 if (ACPI_FAILURE(status)) {
1997 printk(KERN_WARNING PREFIX
1998 "Cant attach device");
2005 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
2008 struct acpi_video_bus *video;
2011 if (!device || !device->video)
2014 video = device->video;
2016 acpi_video_device_remove_fs(device->dev);
2018 status = acpi_remove_notify_handler(device->dev->handle,
2020 acpi_video_device_notify);
2021 sysfs_remove_link(&device->backlight->dev.kobj, "device");
2022 backlight_device_unregister(device->backlight);
2023 if (device->cooling_dev) {
2024 sysfs_remove_link(&device->dev->dev.kobj,
2026 sysfs_remove_link(&device->cooling_dev->device.kobj,
2028 thermal_cooling_device_unregister(device->cooling_dev);
2029 device->cooling_dev = NULL;
2031 video_output_unregister(device->output_dev);
2036 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2039 struct acpi_video_device *dev, *next;
2041 mutex_lock(&video->device_list_lock);
2043 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2045 status = acpi_video_bus_put_one_device(dev);
2046 if (ACPI_FAILURE(status))
2047 printk(KERN_WARNING PREFIX
2048 "hhuuhhuu bug in acpi video driver.\n");
2050 if (dev->brightness) {
2051 kfree(dev->brightness->levels);
2052 kfree(dev->brightness);
2054 list_del(&dev->entry);
2058 mutex_unlock(&video->device_list_lock);
2063 /* acpi_video interface */
2065 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
2067 return acpi_video_bus_DOS(video, 0, 0);
2070 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
2072 return acpi_video_bus_DOS(video, 0, 1);
2075 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
2077 struct acpi_video_bus *video = acpi_driver_data(device);
2078 struct input_dev *input;
2084 input = video->input;
2087 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
2088 * most likely via hotkey. */
2089 acpi_bus_generate_proc_event(device, event, 0);
2090 keycode = KEY_SWITCHVIDEOMODE;
2093 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
2095 acpi_video_device_enumerate(video);
2096 acpi_video_device_rebind(video);
2097 acpi_bus_generate_proc_event(device, event, 0);
2098 keycode = KEY_SWITCHVIDEOMODE;
2101 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
2102 acpi_bus_generate_proc_event(device, event, 0);
2103 keycode = KEY_SWITCHVIDEOMODE;
2105 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
2106 acpi_bus_generate_proc_event(device, event, 0);
2107 keycode = KEY_VIDEO_NEXT;
2109 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
2110 acpi_bus_generate_proc_event(device, event, 0);
2111 keycode = KEY_VIDEO_PREV;
2115 keycode = KEY_UNKNOWN;
2116 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2117 "Unsupported event [0x%x]\n", event));
2121 acpi_notifier_call_chain(device, event, 0);
2122 input_report_key(input, keycode, 1);
2124 input_report_key(input, keycode, 0);
2130 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
2132 struct acpi_video_device *video_device = data;
2133 struct acpi_device *device = NULL;
2134 struct acpi_video_bus *bus;
2135 struct input_dev *input;
2141 device = video_device->dev;
2142 bus = video_device->video;
2146 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
2147 if (brightness_switch_enabled)
2148 acpi_video_switch_brightness(video_device, event);
2149 acpi_bus_generate_proc_event(device, event, 0);
2150 keycode = KEY_BRIGHTNESS_CYCLE;
2152 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
2153 if (brightness_switch_enabled)
2154 acpi_video_switch_brightness(video_device, event);
2155 acpi_bus_generate_proc_event(device, event, 0);
2156 keycode = KEY_BRIGHTNESSUP;
2158 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
2159 if (brightness_switch_enabled)
2160 acpi_video_switch_brightness(video_device, event);
2161 acpi_bus_generate_proc_event(device, event, 0);
2162 keycode = KEY_BRIGHTNESSDOWN;
2164 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
2165 if (brightness_switch_enabled)
2166 acpi_video_switch_brightness(video_device, event);
2167 acpi_bus_generate_proc_event(device, event, 0);
2168 keycode = KEY_BRIGHTNESS_ZERO;
2170 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
2171 if (brightness_switch_enabled)
2172 acpi_video_switch_brightness(video_device, event);
2173 acpi_bus_generate_proc_event(device, event, 0);
2174 keycode = KEY_DISPLAY_OFF;
2177 keycode = KEY_UNKNOWN;
2178 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2179 "Unsupported event [0x%x]\n", event));
2183 acpi_notifier_call_chain(device, event, 0);
2184 input_report_key(input, keycode, 1);
2186 input_report_key(input, keycode, 0);
2192 static int instance;
2193 static int acpi_video_resume(struct acpi_device *device)
2195 struct acpi_video_bus *video;
2196 struct acpi_video_device *video_device;
2199 if (!device || !acpi_driver_data(device))
2202 video = acpi_driver_data(device);
2204 for (i = 0; i < video->attached_count; i++) {
2205 video_device = video->attached_array[i].bind_info;
2206 if (video_device && video_device->backlight)
2207 acpi_video_set_brightness(video_device->backlight);
2212 static int acpi_video_bus_add(struct acpi_device *device)
2214 struct acpi_video_bus *video;
2215 struct input_dev *input;
2218 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2222 /* a hack to fix the duplicate name "VID" problem on T61 */
2223 if (!strcmp(device->pnp.bus_id, "VID")) {
2225 device->pnp.bus_id[3] = '0' + instance;
2228 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2229 if (!strcmp(device->pnp.bus_id, "VGA")) {
2231 device->pnp.bus_id[3] = '0' + instance;
2235 video->device = device;
2236 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2237 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2238 device->driver_data = video;
2240 acpi_video_bus_find_cap(video);
2241 error = acpi_video_bus_check(video);
2243 goto err_free_video;
2245 error = acpi_video_bus_add_fs(device);
2247 goto err_free_video;
2249 mutex_init(&video->device_list_lock);
2250 INIT_LIST_HEAD(&video->video_device_list);
2252 acpi_video_bus_get_devices(video, device);
2253 acpi_video_bus_start_devices(video);
2255 video->input = input = input_allocate_device();
2258 goto err_stop_video;
2261 snprintf(video->phys, sizeof(video->phys),
2262 "%s/video/input0", acpi_device_hid(video->device));
2264 input->name = acpi_device_name(video->device);
2265 input->phys = video->phys;
2266 input->id.bustype = BUS_HOST;
2267 input->id.product = 0x06;
2268 input->dev.parent = &device->dev;
2269 input->evbit[0] = BIT(EV_KEY);
2270 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2271 set_bit(KEY_VIDEO_NEXT, input->keybit);
2272 set_bit(KEY_VIDEO_PREV, input->keybit);
2273 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2274 set_bit(KEY_BRIGHTNESSUP, input->keybit);
2275 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2276 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2277 set_bit(KEY_DISPLAY_OFF, input->keybit);
2278 set_bit(KEY_UNKNOWN, input->keybit);
2280 error = input_register_device(input);
2282 goto err_free_input_dev;
2284 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
2285 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2286 video->flags.multihead ? "yes" : "no",
2287 video->flags.rom ? "yes" : "no",
2288 video->flags.post ? "yes" : "no");
2293 input_free_device(input);
2295 acpi_video_bus_stop_devices(video);
2296 acpi_video_bus_put_devices(video);
2297 kfree(video->attached_array);
2298 acpi_video_bus_remove_fs(device);
2301 device->driver_data = NULL;
2306 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2308 struct acpi_video_bus *video = NULL;
2311 if (!device || !acpi_driver_data(device))
2314 video = acpi_driver_data(device);
2316 acpi_video_bus_stop_devices(video);
2317 acpi_video_bus_put_devices(video);
2318 acpi_video_bus_remove_fs(device);
2320 input_unregister_device(video->input);
2321 kfree(video->attached_array);
2327 static int __init intel_opregion_present(void)
2329 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
2330 struct pci_dev *dev = NULL;
2333 for_each_pci_dev(dev) {
2334 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2336 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2338 pci_read_config_dword(dev, 0xfc, &address);
2347 int acpi_video_register(void)
2350 if (register_count) {
2352 * if the function of acpi_video_register is already called,
2353 * don't register the acpi_vide_bus again and return no error.
2358 acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2359 if (!acpi_video_dir)
2362 result = acpi_bus_register_driver(&acpi_video_bus);
2364 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2369 * When the acpi_video_bus is loaded successfully, increase
2370 * the counter reference.
2376 EXPORT_SYMBOL(acpi_video_register);
2378 void acpi_video_unregister(void)
2380 if (!register_count) {
2382 * If the acpi video bus is already unloaded, don't
2383 * unload it again and return directly.
2387 acpi_bus_unregister_driver(&acpi_video_bus);
2389 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2395 EXPORT_SYMBOL(acpi_video_unregister);
2398 * This is kind of nasty. Hardware using Intel chipsets may require
2399 * the video opregion code to be run first in order to initialise
2400 * state before any ACPI video calls are made. To handle this we defer
2401 * registration of the video class until the opregion code has run.
2404 static int __init acpi_video_init(void)
2406 dmi_check_system(video_dmi_table);
2408 if (intel_opregion_present())
2411 return acpi_video_register();
2414 static void __exit acpi_video_exit(void)
2416 acpi_video_unregister();
2421 module_init(acpi_video_init);
2422 module_exit(acpi_video_exit);