2 * video.c - ACPI Video Driver ($Revision:$)
4 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
5 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
6 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/types.h>
31 #include <linux/list.h>
32 #include <linux/mutex.h>
33 #include <linux/proc_fs.h>
34 #include <linux/seq_file.h>
35 #include <linux/input.h>
36 #include <linux/backlight.h>
37 #include <linux/thermal.h>
38 #include <linux/video_output.h>
39 #include <linux/sort.h>
40 #include <linux/pci.h>
41 #include <linux/pci_ids.h>
42 #include <linux/slab.h>
43 #include <asm/uaccess.h>
44 #include <linux/dmi.h>
45 #include <acpi/acpi_bus.h>
46 #include <acpi/acpi_drivers.h>
48 #define PREFIX "ACPI: "
50 #define ACPI_VIDEO_CLASS "video"
51 #define ACPI_VIDEO_BUS_NAME "Video Bus"
52 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
53 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
54 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
55 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
56 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
57 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
59 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
60 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
61 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
62 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
63 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
65 #define MAX_NAME_LEN 20
67 #define ACPI_VIDEO_DISPLAY_CRT 1
68 #define ACPI_VIDEO_DISPLAY_TV 2
69 #define ACPI_VIDEO_DISPLAY_DVI 3
70 #define ACPI_VIDEO_DISPLAY_LCD 4
72 #define _COMPONENT ACPI_VIDEO_COMPONENT
73 ACPI_MODULE_NAME("video");
75 MODULE_AUTHOR("Bruno Ducrot");
76 MODULE_DESCRIPTION("ACPI Video Driver");
77 MODULE_LICENSE("GPL");
79 static int brightness_switch_enabled = 1;
80 module_param(brightness_switch_enabled, bool, 0644);
83 * By default, we don't allow duplicate ACPI video bus devices
84 * under the same VGA controller
86 static int allow_duplicates;
87 module_param(allow_duplicates, bool, 0644);
89 static int register_count = 0;
90 static int acpi_video_bus_add(struct acpi_device *device);
91 static int acpi_video_bus_remove(struct acpi_device *device, int type);
92 static int acpi_video_resume(struct acpi_device *device);
93 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
95 static const struct acpi_device_id video_device_ids[] = {
99 MODULE_DEVICE_TABLE(acpi, video_device_ids);
101 static struct acpi_driver acpi_video_bus = {
103 .class = ACPI_VIDEO_CLASS,
104 .ids = video_device_ids,
106 .add = acpi_video_bus_add,
107 .remove = acpi_video_bus_remove,
108 .resume = acpi_video_resume,
109 .notify = acpi_video_bus_notify,
113 struct acpi_video_bus_flags {
114 u8 multihead:1; /* can switch video heads */
115 u8 rom:1; /* can retrieve a video rom */
116 u8 post:1; /* can configure the head to */
120 struct acpi_video_bus_cap {
121 u8 _DOS:1; /*Enable/Disable output switching */
122 u8 _DOD:1; /*Enumerate all devices attached to display adapter */
123 u8 _ROM:1; /*Get ROM Data */
124 u8 _GPD:1; /*Get POST Device */
125 u8 _SPD:1; /*Set POST Device */
126 u8 _VPO:1; /*Video POST Options */
130 struct acpi_video_device_attrib {
131 u32 display_index:4; /* A zero-based instance of the Display */
132 u32 display_port_attachment:4; /*This field differentiates the display type */
133 u32 display_type:4; /*Describe the specific type in use */
134 u32 vendor_specific:4; /*Chipset Vendor Specific */
135 u32 bios_can_detect:1; /*BIOS can detect the device */
136 u32 depend_on_vga:1; /*Non-VGA output device whose power is related to
138 u32 pipe_id:3; /*For VGA multiple-head devices. */
139 u32 reserved:10; /*Must be 0 */
140 u32 device_id_scheme:1; /*Device ID Scheme */
143 struct acpi_video_enumerated_device {
146 struct acpi_video_device_attrib attrib;
148 struct acpi_video_device *bind_info;
151 struct acpi_video_bus {
152 struct acpi_device *device;
154 struct acpi_video_enumerated_device *attached_array;
156 struct acpi_video_bus_cap cap;
157 struct acpi_video_bus_flags flags;
158 struct list_head video_device_list;
159 struct mutex device_list_lock; /* protects video_device_list */
160 struct proc_dir_entry *dir;
161 struct input_dev *input;
162 char phys[32]; /* for input device */
165 struct acpi_video_device_flags {
175 struct acpi_video_device_cap {
176 u8 _ADR:1; /*Return the unique ID */
177 u8 _BCL:1; /*Query list of brightness control levels supported */
178 u8 _BCM:1; /*Set the brightness level */
179 u8 _BQC:1; /* Get current brightness level */
180 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
181 u8 _DDC:1; /*Return the EDID for this device */
182 u8 _DCS:1; /*Return status of output device */
183 u8 _DGS:1; /*Query graphics state */
184 u8 _DSS:1; /*Device state set */
187 struct acpi_video_brightness_flags {
188 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
189 u8 _BCL_reversed:1; /* _BCL package is in a reversed order*/
190 u8 _BCL_use_index:1; /* levels in _BCL are index values */
191 u8 _BCM_use_index:1; /* input of _BCM is an index value */
192 u8 _BQC_use_index:1; /* _BQC returns an index value */
195 struct acpi_video_device_brightness {
199 struct acpi_video_brightness_flags flags;
202 struct acpi_video_device {
203 unsigned long device_id;
204 struct acpi_video_device_flags flags;
205 struct acpi_video_device_cap cap;
206 struct list_head entry;
207 struct acpi_video_bus *video;
208 struct acpi_device *dev;
209 struct acpi_video_device_brightness *brightness;
210 struct backlight_device *backlight;
211 struct thermal_cooling_device *cooling_dev;
212 struct output_device *output_dev;
216 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
217 static const struct file_operations acpi_video_bus_info_fops = {
218 .owner = THIS_MODULE,
219 .open = acpi_video_bus_info_open_fs,
222 .release = single_release,
225 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
226 static const struct file_operations acpi_video_bus_ROM_fops = {
227 .owner = THIS_MODULE,
228 .open = acpi_video_bus_ROM_open_fs,
231 .release = single_release,
234 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
236 static const struct file_operations acpi_video_bus_POST_info_fops = {
237 .owner = THIS_MODULE,
238 .open = acpi_video_bus_POST_info_open_fs,
241 .release = single_release,
244 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
245 static ssize_t acpi_video_bus_write_POST(struct file *file,
246 const char __user *buffer, size_t count, loff_t *data);
247 static const struct file_operations acpi_video_bus_POST_fops = {
248 .owner = THIS_MODULE,
249 .open = acpi_video_bus_POST_open_fs,
251 .write = acpi_video_bus_write_POST,
253 .release = single_release,
256 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
257 static ssize_t acpi_video_bus_write_DOS(struct file *file,
258 const char __user *buffer, size_t count, loff_t *data);
259 static const struct file_operations acpi_video_bus_DOS_fops = {
260 .owner = THIS_MODULE,
261 .open = acpi_video_bus_DOS_open_fs,
263 .write = acpi_video_bus_write_DOS,
265 .release = single_release,
269 static int acpi_video_device_info_open_fs(struct inode *inode,
271 static const struct file_operations acpi_video_device_info_fops = {
272 .owner = THIS_MODULE,
273 .open = acpi_video_device_info_open_fs,
276 .release = single_release,
279 static int acpi_video_device_state_open_fs(struct inode *inode,
281 static ssize_t acpi_video_device_write_state(struct file *file,
282 const char __user *buffer, size_t count, loff_t *data);
283 static const struct file_operations acpi_video_device_state_fops = {
284 .owner = THIS_MODULE,
285 .open = acpi_video_device_state_open_fs,
287 .write = acpi_video_device_write_state,
289 .release = single_release,
292 static int acpi_video_device_brightness_open_fs(struct inode *inode,
294 static ssize_t acpi_video_device_write_brightness(struct file *file,
295 const char __user *buffer, size_t count, loff_t *data);
296 static const struct file_operations acpi_video_device_brightness_fops = {
297 .owner = THIS_MODULE,
298 .open = acpi_video_device_brightness_open_fs,
300 .write = acpi_video_device_write_brightness,
302 .release = single_release,
305 static int acpi_video_device_EDID_open_fs(struct inode *inode,
307 static const struct file_operations acpi_video_device_EDID_fops = {
308 .owner = THIS_MODULE,
309 .open = acpi_video_device_EDID_open_fs,
312 .release = single_release,
315 static const char device_decode[][30] = {
316 "motherboard VGA device",
322 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
323 static void acpi_video_device_rebind(struct acpi_video_bus *video);
324 static void acpi_video_device_bind(struct acpi_video_bus *video,
325 struct acpi_video_device *device);
326 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
327 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
329 static int acpi_video_device_lcd_get_level_current(
330 struct acpi_video_device *device,
331 unsigned long long *level, int init);
332 static int acpi_video_get_next_level(struct acpi_video_device *device,
333 u32 level_current, u32 event);
334 static int acpi_video_switch_brightness(struct acpi_video_device *device,
336 static int acpi_video_device_get_state(struct acpi_video_device *device,
337 unsigned long long *state);
338 static int acpi_video_output_get(struct output_device *od);
339 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
341 /*backlight device sysfs support*/
342 static int acpi_video_get_brightness(struct backlight_device *bd)
344 unsigned long long cur_level;
346 struct acpi_video_device *vd =
347 (struct acpi_video_device *)bl_get_data(bd);
349 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, 0))
351 for (i = 2; i < vd->brightness->count; i++) {
352 if (vd->brightness->levels[i] == cur_level)
353 /* The first two entries are special - see page 575
354 of the ACPI spec 3.0 */
360 static int acpi_video_set_brightness(struct backlight_device *bd)
362 int request_level = bd->props.brightness + 2;
363 struct acpi_video_device *vd =
364 (struct acpi_video_device *)bl_get_data(bd);
366 return acpi_video_device_lcd_set_level(vd,
367 vd->brightness->levels[request_level]);
370 static struct backlight_ops acpi_backlight_ops = {
371 .get_brightness = acpi_video_get_brightness,
372 .update_status = acpi_video_set_brightness,
375 /*video output device sysfs support*/
376 static int acpi_video_output_get(struct output_device *od)
378 unsigned long long state;
379 struct acpi_video_device *vd =
380 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
381 acpi_video_device_get_state(vd, &state);
385 static int acpi_video_output_set(struct output_device *od)
387 unsigned long state = od->request_state;
388 struct acpi_video_device *vd=
389 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
390 return acpi_video_device_set_state(vd, state);
393 static struct output_properties acpi_output_properties = {
394 .set_state = acpi_video_output_set,
395 .get_status = acpi_video_output_get,
399 /* thermal cooling device callbacks */
400 static int video_get_max_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);
406 *state = video->brightness->count - 3;
410 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
413 struct acpi_device *device = cooling_dev->devdata;
414 struct acpi_video_device *video = acpi_driver_data(device);
415 unsigned long long level;
418 if (acpi_video_device_lcd_get_level_current(video, &level, 0))
420 for (offset = 2; offset < video->brightness->count; offset++)
421 if (level == video->brightness->levels[offset]) {
422 *state = video->brightness->count - offset - 1;
430 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
432 struct acpi_device *device = cooling_dev->devdata;
433 struct acpi_video_device *video = acpi_driver_data(device);
436 if ( state >= video->brightness->count - 2)
439 state = video->brightness->count - state;
440 level = video->brightness->levels[state -1];
441 return acpi_video_device_lcd_set_level(video, level);
444 static struct thermal_cooling_device_ops video_cooling_ops = {
445 .get_max_state = video_get_max_state,
446 .get_cur_state = video_get_cur_state,
447 .set_cur_state = video_set_cur_state,
450 /* --------------------------------------------------------------------------
452 -------------------------------------------------------------------------- */
457 acpi_video_device_query(struct acpi_video_device *device, unsigned long long *state)
461 status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
467 acpi_video_device_get_state(struct acpi_video_device *device,
468 unsigned long long *state)
472 status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
478 acpi_video_device_set_state(struct acpi_video_device *device, int state)
481 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
482 struct acpi_object_list args = { 1, &arg0 };
483 unsigned long long ret;
486 arg0.integer.value = state;
487 status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
493 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
494 union acpi_object **levels)
497 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
498 union acpi_object *obj;
503 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
504 if (!ACPI_SUCCESS(status))
506 obj = (union acpi_object *)buffer.pointer;
507 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
508 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
518 kfree(buffer.pointer);
524 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
527 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
528 struct acpi_object_list args = { 1, &arg0 };
531 arg0.integer.value = level;
533 status = acpi_evaluate_object(device->dev->handle, "_BCM",
535 if (ACPI_FAILURE(status)) {
536 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
540 device->brightness->curr = level;
541 for (state = 2; state < device->brightness->count; state++)
542 if (level == device->brightness->levels[state]) {
543 if (device->backlight)
544 device->backlight->props.brightness = state - 2;
548 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
553 * For some buggy _BQC methods, we need to add a constant value to
554 * the _BQC return value to get the actual current brightness level
557 static int bqc_offset_aml_bug_workaround;
558 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
560 bqc_offset_aml_bug_workaround = 9;
564 static struct dmi_system_id video_dmi_table[] __initdata = {
566 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
569 .callback = video_set_bqc_offset,
570 .ident = "Acer Aspire 5720",
572 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
573 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
577 .callback = video_set_bqc_offset,
578 .ident = "Acer Aspire 5710Z",
580 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
581 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
585 .callback = video_set_bqc_offset,
586 .ident = "eMachines E510",
588 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
589 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
593 .callback = video_set_bqc_offset,
594 .ident = "Acer Aspire 5315",
596 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
597 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
601 .callback = video_set_bqc_offset,
602 .ident = "Acer Aspire 7720",
604 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
605 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
612 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
613 unsigned long long *level, int init)
615 acpi_status status = AE_OK;
618 if (device->cap._BQC || device->cap._BCQ) {
619 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
621 status = acpi_evaluate_integer(device->dev->handle, buf,
623 if (ACPI_SUCCESS(status)) {
624 if (device->brightness->flags._BQC_use_index) {
625 if (device->brightness->flags._BCL_reversed)
626 *level = device->brightness->count
628 *level = device->brightness->levels[*level + 2];
631 *level += bqc_offset_aml_bug_workaround;
632 for (i = 2; i < device->brightness->count; i++)
633 if (device->brightness->levels[i] == *level) {
634 device->brightness->curr = *level;
639 * BQC returned an invalid level.
642 ACPI_WARNING((AE_INFO,
643 "%s returned an invalid level",
645 device->cap._BQC = device->cap._BCQ = 0;
649 * should we return an error or ignore this failure?
650 * dev->brightness->curr is a cached value which stores
651 * the correct current backlight level in most cases.
652 * ACPI video backlight still works w/ buggy _BQC.
653 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
655 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
656 device->cap._BQC = device->cap._BCQ = 0;
660 *level = device->brightness->curr;
665 acpi_video_device_EDID(struct acpi_video_device *device,
666 union acpi_object **edid, ssize_t length)
669 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
670 union acpi_object *obj;
671 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
672 struct acpi_object_list args = { 1, &arg0 };
680 arg0.integer.value = 1;
681 else if (length == 256)
682 arg0.integer.value = 2;
686 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
687 if (ACPI_FAILURE(status))
690 obj = buffer.pointer;
692 if (obj && obj->type == ACPI_TYPE_BUFFER)
695 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
706 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
709 unsigned long long tmp;
710 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
711 struct acpi_object_list args = { 1, &arg0 };
714 arg0.integer.value = option;
716 status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
717 if (ACPI_SUCCESS(status))
718 status = tmp ? (-EINVAL) : (AE_OK);
724 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long long *id)
728 status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
734 acpi_video_bus_POST_options(struct acpi_video_bus *video,
735 unsigned long long *options)
739 status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
747 * video : video bus device pointer
749 * 0. The system BIOS should NOT automatically switch(toggle)
750 * the active display output.
751 * 1. The system BIOS should automatically switch (toggle) the
752 * active display output. No switch event.
753 * 2. The _DGS value should be locked.
754 * 3. The system BIOS should not automatically switch (toggle) the
755 * active display output, but instead generate the display switch
758 * 0. The system BIOS should automatically control the brightness level
759 * of the LCD when the power changes from AC to DC
760 * 1. The system BIOS should NOT automatically control the brightness
761 * level of the LCD when the power changes from AC to DC.
767 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
770 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
771 struct acpi_object_list args = { 1, &arg0 };
774 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
778 arg0.integer.value = (lcd_flag << 2) | bios_flag;
779 video->dos_setting = arg0.integer.value;
780 acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
787 * Simple comparison function used to sort backlight levels.
791 acpi_video_cmp_level(const void *a, const void *b)
793 return *(int *)a - *(int *)b;
798 * device : video output device (LCD, CRT, ..)
801 * Maximum brightness level
803 * Allocate and initialize device->brightness.
807 acpi_video_init_brightness(struct acpi_video_device *device)
809 union acpi_object *obj = NULL;
810 int i, max_level = 0, count = 0, level_ac_battery = 0;
811 unsigned long long level, level_old;
812 union acpi_object *o;
813 struct acpi_video_device_brightness *br = NULL;
814 int result = -EINVAL;
816 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
817 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
818 "LCD brightness level\n"));
822 if (obj->package.count < 2)
825 br = kzalloc(sizeof(*br), GFP_KERNEL);
827 printk(KERN_ERR "can't allocate memory\n");
832 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
839 for (i = 0; i < obj->package.count; i++) {
840 o = (union acpi_object *)&obj->package.elements[i];
841 if (o->type != ACPI_TYPE_INTEGER) {
842 printk(KERN_ERR PREFIX "Invalid data\n");
845 br->levels[count] = (u32) o->integer.value;
847 if (br->levels[count] > max_level)
848 max_level = br->levels[count];
853 * some buggy BIOS don't export the levels
854 * when machine is on AC/Battery in _BCL package.
855 * In this case, the first two elements in _BCL packages
856 * are also supported brightness levels that OS should take care of.
858 for (i = 2; i < count; i++) {
859 if (br->levels[i] == br->levels[0])
861 if (br->levels[i] == br->levels[1])
865 if (level_ac_battery < 2) {
866 level_ac_battery = 2 - level_ac_battery;
867 br->flags._BCL_no_ac_battery_levels = 1;
868 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
869 br->levels[i] = br->levels[i - level_ac_battery];
870 count += level_ac_battery;
871 } else if (level_ac_battery > 2)
872 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
874 /* Check if the _BCL package is in a reversed order */
875 if (max_level == br->levels[2]) {
876 br->flags._BCL_reversed = 1;
877 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
878 acpi_video_cmp_level, NULL);
879 } else if (max_level != br->levels[count - 1])
881 "Found unordered _BCL package\n"));
884 device->brightness = br;
886 /* Check the input/output of _BQC/_BCL/_BCM */
887 if ((max_level < 100) && (max_level <= (count - 2)))
888 br->flags._BCL_use_index = 1;
891 * _BCM is always consistent with _BCL,
892 * at least for all the laptops we have ever seen.
894 br->flags._BCM_use_index = br->flags._BCL_use_index;
896 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
897 br->curr = level = max_level;
899 if (!device->cap._BQC)
902 result = acpi_video_device_lcd_get_level_current(device, &level_old, 1);
904 goto out_free_levels;
907 * Set the level to maximum and check if _BQC uses indexed value
909 result = acpi_video_device_lcd_set_level(device, max_level);
911 goto out_free_levels;
913 result = acpi_video_device_lcd_get_level_current(device, &level, 0);
915 goto out_free_levels;
917 br->flags._BQC_use_index = (level == max_level ? 0 : 1);
919 if (!br->flags._BQC_use_index) {
921 * Set the backlight to the initial state.
922 * On some buggy laptops, _BQC returns an uninitialized value
923 * when invoked for the first time, i.e. level_old is invalid.
924 * set the backlight to max_level in this case
926 for (i = 2; i < br->count; i++)
927 if (level_old == br->levels[i])
932 if (br->flags._BCL_reversed)
933 level_old = (br->count - 1) - level_old;
934 level = br->levels[level_old];
937 result = acpi_video_device_lcd_set_level(device, level);
939 goto out_free_levels;
941 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
942 "found %d brightness levels\n", count - 2));
951 device->brightness = NULL;
958 * device : video output device (LCD, CRT, ..)
963 * Find out all required AML methods defined under the output
967 static void acpi_video_device_find_cap(struct acpi_video_device *device)
969 acpi_handle h_dummy1;
971 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
972 device->cap._ADR = 1;
974 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
975 device->cap._BCL = 1;
977 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
978 device->cap._BCM = 1;
980 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
981 device->cap._BQC = 1;
982 else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
984 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
985 device->cap._BCQ = 1;
988 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
989 device->cap._DDC = 1;
991 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
992 device->cap._DCS = 1;
994 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
995 device->cap._DGS = 1;
997 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
998 device->cap._DSS = 1;
1001 if (acpi_video_backlight_support()) {
1002 struct backlight_properties props;
1004 static int count = 0;
1007 result = acpi_video_init_brightness(device);
1010 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
1014 sprintf(name, "acpi_video%d", count++);
1015 memset(&props, 0, sizeof(struct backlight_properties));
1016 props.max_brightness = device->brightness->count - 3;
1017 device->backlight = backlight_device_register(name, NULL, device,
1018 &acpi_backlight_ops,
1021 if (IS_ERR(device->backlight))
1024 result = sysfs_create_link(&device->backlight->dev.kobj,
1025 &device->dev->dev.kobj, "device");
1027 printk(KERN_ERR PREFIX "Create sysfs link\n");
1029 device->cooling_dev = thermal_cooling_device_register("LCD",
1030 device->dev, &video_cooling_ops);
1031 if (IS_ERR(device->cooling_dev)) {
1033 * Set cooling_dev to NULL so we don't crash trying to
1035 * Also, why the hell we are returning early and
1036 * not attempt to register video output if cooling
1037 * device registration failed?
1040 device->cooling_dev = NULL;
1044 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1045 device->cooling_dev->id);
1046 result = sysfs_create_link(&device->dev->dev.kobj,
1047 &device->cooling_dev->device.kobj,
1050 printk(KERN_ERR PREFIX "Create sysfs link\n");
1051 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1052 &device->dev->dev.kobj, "device");
1054 printk(KERN_ERR PREFIX "Create sysfs link\n");
1058 if (acpi_video_display_switch_support()) {
1060 if (device->cap._DCS && device->cap._DSS) {
1063 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
1066 sprintf(name, "acpi_video%d", count++);
1067 device->output_dev = video_output_register(name,
1068 NULL, device, &acpi_output_properties);
1076 * device : video output device (VGA)
1081 * Find out all required AML methods defined under the video bus device.
1084 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1086 acpi_handle h_dummy1;
1088 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
1089 video->cap._DOS = 1;
1091 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
1092 video->cap._DOD = 1;
1094 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
1095 video->cap._ROM = 1;
1097 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
1098 video->cap._GPD = 1;
1100 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
1101 video->cap._SPD = 1;
1103 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
1104 video->cap._VPO = 1;
1109 * Check whether the video bus device has required AML method to
1110 * support the desired features
1113 static int acpi_video_bus_check(struct acpi_video_bus *video)
1115 acpi_status status = -ENOENT;
1116 struct pci_dev *dev;
1121 dev = acpi_get_pci_dev(video->device->handle);
1126 /* Since there is no HID, CID and so on for VGA driver, we have
1127 * to check well known required nodes.
1130 /* Does this device support video switching? */
1131 if (video->cap._DOS || video->cap._DOD) {
1132 if (!video->cap._DOS) {
1133 printk(KERN_WARNING FW_BUG
1134 "ACPI(%s) defines _DOD but not _DOS\n",
1135 acpi_device_bid(video->device));
1137 video->flags.multihead = 1;
1141 /* Does this device support retrieving a video ROM? */
1142 if (video->cap._ROM) {
1143 video->flags.rom = 1;
1147 /* Does this device support configuring which video device to POST? */
1148 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1149 video->flags.post = 1;
1156 /* --------------------------------------------------------------------------
1157 FS Interface (/proc)
1158 -------------------------------------------------------------------------- */
1160 static struct proc_dir_entry *acpi_video_dir;
1164 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
1166 struct acpi_video_device *dev = seq->private;
1172 seq_printf(seq, "device_id: 0x%04x\n", (u32) dev->device_id);
1173 seq_printf(seq, "type: ");
1175 seq_printf(seq, "CRT\n");
1176 else if (dev->flags.lcd)
1177 seq_printf(seq, "LCD\n");
1178 else if (dev->flags.tvout)
1179 seq_printf(seq, "TVOUT\n");
1180 else if (dev->flags.dvi)
1181 seq_printf(seq, "DVI\n");
1183 seq_printf(seq, "UNKNOWN\n");
1185 seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
1192 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
1194 return single_open(file, acpi_video_device_info_seq_show,
1198 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
1201 struct acpi_video_device *dev = seq->private;
1202 unsigned long long state;
1208 status = acpi_video_device_get_state(dev, &state);
1209 seq_printf(seq, "state: ");
1210 if (ACPI_SUCCESS(status))
1211 seq_printf(seq, "0x%02llx\n", state);
1213 seq_printf(seq, "<not supported>\n");
1215 status = acpi_video_device_query(dev, &state);
1216 seq_printf(seq, "query: ");
1217 if (ACPI_SUCCESS(status))
1218 seq_printf(seq, "0x%02llx\n", state);
1220 seq_printf(seq, "<not supported>\n");
1227 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
1229 return single_open(file, acpi_video_device_state_seq_show,
1234 acpi_video_device_write_state(struct file *file,
1235 const char __user * buffer,
1236 size_t count, loff_t * data)
1239 struct seq_file *m = file->private_data;
1240 struct acpi_video_device *dev = m->private;
1241 char str[12] = { 0 };
1245 if (!dev || count >= sizeof(str))
1248 if (copy_from_user(str, buffer, count))
1252 state = simple_strtoul(str, NULL, 0);
1253 state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
1255 status = acpi_video_device_set_state(dev, state);
1264 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
1266 struct acpi_video_device *dev = seq->private;
1270 if (!dev || !dev->brightness) {
1271 seq_printf(seq, "<not supported>\n");
1275 seq_printf(seq, "levels: ");
1276 for (i = 2; i < dev->brightness->count; i++)
1277 seq_printf(seq, " %d", dev->brightness->levels[i]);
1278 seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
1284 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1286 return single_open(file, acpi_video_device_brightness_seq_show,
1291 acpi_video_device_write_brightness(struct file *file,
1292 const char __user * buffer,
1293 size_t count, loff_t * data)
1295 struct seq_file *m = file->private_data;
1296 struct acpi_video_device *dev = m->private;
1297 char str[5] = { 0 };
1298 unsigned int level = 0;
1302 if (!dev || !dev->brightness || count >= sizeof(str))
1305 if (copy_from_user(str, buffer, count))
1309 level = simple_strtoul(str, NULL, 0);
1314 /* validate through the list of available levels */
1315 for (i = 2; i < dev->brightness->count; i++)
1316 if (level == dev->brightness->levels[i]) {
1317 if (!acpi_video_device_lcd_set_level(dev, level))
1325 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1327 struct acpi_video_device *dev = seq->private;
1330 union acpi_object *edid = NULL;
1336 status = acpi_video_device_EDID(dev, &edid, 128);
1337 if (ACPI_FAILURE(status)) {
1338 status = acpi_video_device_EDID(dev, &edid, 256);
1341 if (ACPI_FAILURE(status)) {
1345 if (edid && edid->type == ACPI_TYPE_BUFFER) {
1346 for (i = 0; i < edid->buffer.length; i++)
1347 seq_putc(seq, edid->buffer.pointer[i]);
1352 seq_printf(seq, "<not supported>\n");
1360 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1362 return single_open(file, acpi_video_device_EDID_seq_show,
1366 static int acpi_video_device_add_fs(struct acpi_device *device)
1368 struct proc_dir_entry *entry, *device_dir;
1369 struct acpi_video_device *vid_dev;
1371 vid_dev = acpi_driver_data(device);
1375 device_dir = proc_mkdir(acpi_device_bid(device),
1376 vid_dev->video->dir);
1381 entry = proc_create_data("info", S_IRUGO, device_dir,
1382 &acpi_video_device_info_fops, acpi_driver_data(device));
1384 goto err_remove_dir;
1387 entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1389 &acpi_video_device_state_fops,
1390 acpi_driver_data(device));
1392 goto err_remove_info;
1394 /* 'brightness' [R/W] */
1395 entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1397 &acpi_video_device_brightness_fops,
1398 acpi_driver_data(device));
1400 goto err_remove_state;
1403 entry = proc_create_data("EDID", S_IRUGO, device_dir,
1404 &acpi_video_device_EDID_fops,
1405 acpi_driver_data(device));
1407 goto err_remove_brightness;
1409 acpi_device_dir(device) = device_dir;
1413 err_remove_brightness:
1414 remove_proc_entry("brightness", device_dir);
1416 remove_proc_entry("state", device_dir);
1418 remove_proc_entry("info", device_dir);
1420 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1424 static int acpi_video_device_remove_fs(struct acpi_device *device)
1426 struct acpi_video_device *vid_dev;
1427 struct proc_dir_entry *device_dir;
1429 vid_dev = acpi_driver_data(device);
1430 if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1433 device_dir = acpi_device_dir(device);
1435 remove_proc_entry("info", device_dir);
1436 remove_proc_entry("state", device_dir);
1437 remove_proc_entry("brightness", device_dir);
1438 remove_proc_entry("EDID", device_dir);
1439 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1440 acpi_device_dir(device) = NULL;
1447 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1449 struct acpi_video_bus *video = seq->private;
1455 seq_printf(seq, "Switching heads: %s\n",
1456 video->flags.multihead ? "yes" : "no");
1457 seq_printf(seq, "Video ROM: %s\n",
1458 video->flags.rom ? "yes" : "no");
1459 seq_printf(seq, "Device to be POSTed on boot: %s\n",
1460 video->flags.post ? "yes" : "no");
1466 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1468 return single_open(file, acpi_video_bus_info_seq_show,
1472 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1474 struct acpi_video_bus *video = seq->private;
1480 printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1481 seq_printf(seq, "<TODO>\n");
1487 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1489 return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1492 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1494 struct acpi_video_bus *video = seq->private;
1495 unsigned long long options;
1502 status = acpi_video_bus_POST_options(video, &options);
1503 if (ACPI_SUCCESS(status)) {
1504 if (!(options & 1)) {
1505 printk(KERN_WARNING PREFIX
1506 "The motherboard VGA device is not listed as a possible POST device.\n");
1507 printk(KERN_WARNING PREFIX
1508 "This indicates a BIOS bug. Please contact the manufacturer.\n");
1510 printk(KERN_WARNING "%llx\n", options);
1511 seq_printf(seq, "can POST: <integrated video>");
1513 seq_printf(seq, " <PCI video>");
1515 seq_printf(seq, " <AGP video>");
1516 seq_putc(seq, '\n');
1518 seq_printf(seq, "<not supported>\n");
1524 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1526 return single_open(file, acpi_video_bus_POST_info_seq_show,
1530 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1532 struct acpi_video_bus *video = seq->private;
1534 unsigned long long id;
1540 status = acpi_video_bus_get_POST(video, &id);
1541 if (!ACPI_SUCCESS(status)) {
1542 seq_printf(seq, "<not supported>\n");
1545 seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1551 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1553 struct acpi_video_bus *video = seq->private;
1556 seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1561 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1563 return single_open(file, acpi_video_bus_POST_seq_show,
1567 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1569 return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1573 acpi_video_bus_write_POST(struct file *file,
1574 const char __user * buffer,
1575 size_t count, loff_t * data)
1578 struct seq_file *m = file->private_data;
1579 struct acpi_video_bus *video = m->private;
1580 char str[12] = { 0 };
1581 unsigned long long opt, options;
1584 if (!video || count >= sizeof(str))
1587 status = acpi_video_bus_POST_options(video, &options);
1588 if (!ACPI_SUCCESS(status))
1591 if (copy_from_user(str, buffer, count))
1595 opt = strtoul(str, NULL, 0);
1599 /* just in case an OEM 'forgot' the motherboard... */
1602 if (options & (1ul << opt)) {
1603 status = acpi_video_bus_set_POST(video, opt);
1604 if (!ACPI_SUCCESS(status))
1613 acpi_video_bus_write_DOS(struct file *file,
1614 const char __user * buffer,
1615 size_t count, loff_t * data)
1618 struct seq_file *m = file->private_data;
1619 struct acpi_video_bus *video = m->private;
1620 char str[12] = { 0 };
1624 if (!video || count >= sizeof(str))
1627 if (copy_from_user(str, buffer, count))
1631 opt = strtoul(str, NULL, 0);
1635 status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1637 if (!ACPI_SUCCESS(status))
1643 static int acpi_video_bus_add_fs(struct acpi_device *device)
1645 struct acpi_video_bus *video = acpi_driver_data(device);
1646 struct proc_dir_entry *device_dir;
1647 struct proc_dir_entry *entry;
1649 device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1654 entry = proc_create_data("info", S_IRUGO, device_dir,
1655 &acpi_video_bus_info_fops,
1656 acpi_driver_data(device));
1658 goto err_remove_dir;
1661 entry = proc_create_data("ROM", S_IRUGO, device_dir,
1662 &acpi_video_bus_ROM_fops,
1663 acpi_driver_data(device));
1665 goto err_remove_info;
1667 /* 'POST_info' [R] */
1668 entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1669 &acpi_video_bus_POST_info_fops,
1670 acpi_driver_data(device));
1672 goto err_remove_rom;
1675 entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1677 &acpi_video_bus_POST_fops,
1678 acpi_driver_data(device));
1680 goto err_remove_post_info;
1683 entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1685 &acpi_video_bus_DOS_fops,
1686 acpi_driver_data(device));
1688 goto err_remove_post;
1690 video->dir = acpi_device_dir(device) = device_dir;
1694 remove_proc_entry("POST", device_dir);
1695 err_remove_post_info:
1696 remove_proc_entry("POST_info", device_dir);
1698 remove_proc_entry("ROM", device_dir);
1700 remove_proc_entry("info", device_dir);
1702 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1706 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1708 struct proc_dir_entry *device_dir = acpi_device_dir(device);
1711 remove_proc_entry("info", device_dir);
1712 remove_proc_entry("ROM", device_dir);
1713 remove_proc_entry("POST_info", device_dir);
1714 remove_proc_entry("POST", device_dir);
1715 remove_proc_entry("DOS", device_dir);
1716 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1717 acpi_device_dir(device) = NULL;
1723 /* --------------------------------------------------------------------------
1725 -------------------------------------------------------------------------- */
1727 /* device interface */
1728 static struct acpi_video_device_attrib*
1729 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1731 struct acpi_video_enumerated_device *ids;
1734 for (i = 0; i < video->attached_count; i++) {
1735 ids = &video->attached_array[i];
1736 if ((ids->value.int_val & 0xffff) == device_id)
1737 return &ids->value.attrib;
1744 acpi_video_bus_get_one_device(struct acpi_device *device,
1745 struct acpi_video_bus *video)
1747 unsigned long long device_id;
1749 struct acpi_video_device *data;
1750 struct acpi_video_device_attrib* attribute;
1752 if (!device || !video)
1756 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1757 if (ACPI_SUCCESS(status)) {
1759 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1763 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1764 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1765 device->driver_data = data;
1767 data->device_id = device_id;
1768 data->video = video;
1771 attribute = acpi_video_get_device_attr(video, device_id);
1773 if((attribute != NULL) && attribute->device_id_scheme) {
1774 switch (attribute->display_type) {
1775 case ACPI_VIDEO_DISPLAY_CRT:
1776 data->flags.crt = 1;
1778 case ACPI_VIDEO_DISPLAY_TV:
1779 data->flags.tvout = 1;
1781 case ACPI_VIDEO_DISPLAY_DVI:
1782 data->flags.dvi = 1;
1784 case ACPI_VIDEO_DISPLAY_LCD:
1785 data->flags.lcd = 1;
1788 data->flags.unknown = 1;
1791 if(attribute->bios_can_detect)
1792 data->flags.bios = 1;
1794 data->flags.unknown = 1;
1796 acpi_video_device_bind(video, data);
1797 acpi_video_device_find_cap(data);
1799 status = acpi_install_notify_handler(device->handle,
1801 acpi_video_device_notify,
1803 if (ACPI_FAILURE(status)) {
1804 printk(KERN_ERR PREFIX
1805 "Error installing notify handler\n");
1806 if(data->brightness)
1807 kfree(data->brightness->levels);
1808 kfree(data->brightness);
1813 mutex_lock(&video->device_list_lock);
1814 list_add_tail(&data->entry, &video->video_device_list);
1815 mutex_unlock(&video->device_list_lock);
1817 acpi_video_device_add_fs(device);
1827 * video : video bus device
1832 * Enumerate the video device list of the video bus,
1833 * bind the ids with the corresponding video devices
1834 * under the video bus.
1837 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1839 struct acpi_video_device *dev;
1841 mutex_lock(&video->device_list_lock);
1843 list_for_each_entry(dev, &video->video_device_list, entry)
1844 acpi_video_device_bind(video, dev);
1846 mutex_unlock(&video->device_list_lock);
1851 * video : video bus device
1852 * device : video output device under the video
1858 * Bind the ids with the corresponding video devices
1859 * under the video bus.
1863 acpi_video_device_bind(struct acpi_video_bus *video,
1864 struct acpi_video_device *device)
1866 struct acpi_video_enumerated_device *ids;
1869 for (i = 0; i < video->attached_count; i++) {
1870 ids = &video->attached_array[i];
1871 if (device->device_id == (ids->value.int_val & 0xffff)) {
1872 ids->bind_info = device;
1873 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1880 * video : video bus device
1885 * Call _DOD to enumerate all devices attached to display adapter
1889 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1894 struct acpi_video_enumerated_device *active_list;
1895 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1896 union acpi_object *dod = NULL;
1897 union acpi_object *obj;
1899 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1900 if (!ACPI_SUCCESS(status)) {
1901 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1905 dod = buffer.pointer;
1906 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1907 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1912 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1913 dod->package.count));
1915 active_list = kcalloc(1 + dod->package.count,
1916 sizeof(struct acpi_video_enumerated_device),
1924 for (i = 0; i < dod->package.count; i++) {
1925 obj = &dod->package.elements[i];
1927 if (obj->type != ACPI_TYPE_INTEGER) {
1928 printk(KERN_ERR PREFIX
1929 "Invalid _DOD data in element %d\n", i);
1933 active_list[count].value.int_val = obj->integer.value;
1934 active_list[count].bind_info = NULL;
1935 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1936 (int)obj->integer.value));
1940 kfree(video->attached_array);
1942 video->attached_array = active_list;
1943 video->attached_count = count;
1946 kfree(buffer.pointer);
1951 acpi_video_get_next_level(struct acpi_video_device *device,
1952 u32 level_current, u32 event)
1954 int min, max, min_above, max_below, i, l, delta = 255;
1955 max = max_below = 0;
1956 min = min_above = 255;
1957 /* Find closest level to level_current */
1958 for (i = 2; i < device->brightness->count; i++) {
1959 l = device->brightness->levels[i];
1960 if (abs(l - level_current) < abs(delta)) {
1961 delta = l - level_current;
1966 /* Ajust level_current to closest available level */
1967 level_current += delta;
1968 for (i = 2; i < device->brightness->count; i++) {
1969 l = device->brightness->levels[i];
1974 if (l < min_above && l > level_current)
1976 if (l > max_below && l < level_current)
1981 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1982 return (level_current < max) ? min_above : min;
1983 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1984 return (level_current < max) ? min_above : max;
1985 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1986 return (level_current > min) ? max_below : min;
1987 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1988 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1991 return level_current;
1996 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1998 unsigned long long level_current, level_next;
1999 int result = -EINVAL;
2001 /* no warning message if acpi_backlight=vendor is used */
2002 if (!acpi_video_backlight_support())
2005 if (!device->brightness)
2008 result = acpi_video_device_lcd_get_level_current(device,
2013 level_next = acpi_video_get_next_level(device, level_current, event);
2015 result = acpi_video_device_lcd_set_level(device, level_next);
2018 backlight_force_update(device->backlight,
2019 BACKLIGHT_UPDATE_HOTKEY);
2023 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
2029 acpi_video_bus_get_devices(struct acpi_video_bus *video,
2030 struct acpi_device *device)
2033 struct acpi_device *dev;
2035 acpi_video_device_enumerate(video);
2037 list_for_each_entry(dev, &device->children, node) {
2039 status = acpi_video_bus_get_one_device(dev, video);
2040 if (ACPI_FAILURE(status)) {
2041 printk(KERN_WARNING PREFIX
2042 "Cant attach device");
2049 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
2052 struct acpi_video_bus *video;
2055 if (!device || !device->video)
2058 video = device->video;
2060 acpi_video_device_remove_fs(device->dev);
2062 status = acpi_remove_notify_handler(device->dev->handle,
2064 acpi_video_device_notify);
2065 if (device->backlight) {
2066 sysfs_remove_link(&device->backlight->dev.kobj, "device");
2067 backlight_device_unregister(device->backlight);
2068 device->backlight = NULL;
2070 if (device->cooling_dev) {
2071 sysfs_remove_link(&device->dev->dev.kobj,
2073 sysfs_remove_link(&device->cooling_dev->device.kobj,
2075 thermal_cooling_device_unregister(device->cooling_dev);
2076 device->cooling_dev = NULL;
2078 video_output_unregister(device->output_dev);
2083 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2086 struct acpi_video_device *dev, *next;
2088 mutex_lock(&video->device_list_lock);
2090 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2092 status = acpi_video_bus_put_one_device(dev);
2093 if (ACPI_FAILURE(status))
2094 printk(KERN_WARNING PREFIX
2095 "hhuuhhuu bug in acpi video driver.\n");
2097 if (dev->brightness) {
2098 kfree(dev->brightness->levels);
2099 kfree(dev->brightness);
2101 list_del(&dev->entry);
2105 mutex_unlock(&video->device_list_lock);
2110 /* acpi_video interface */
2112 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
2114 return acpi_video_bus_DOS(video, 0, 0);
2117 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
2119 return acpi_video_bus_DOS(video, 0, 1);
2122 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
2124 struct acpi_video_bus *video = acpi_driver_data(device);
2125 struct input_dev *input;
2131 input = video->input;
2134 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
2135 * most likely via hotkey. */
2136 acpi_bus_generate_proc_event(device, event, 0);
2137 keycode = KEY_SWITCHVIDEOMODE;
2140 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
2142 acpi_video_device_enumerate(video);
2143 acpi_video_device_rebind(video);
2144 acpi_bus_generate_proc_event(device, event, 0);
2145 keycode = KEY_SWITCHVIDEOMODE;
2148 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
2149 acpi_bus_generate_proc_event(device, event, 0);
2150 keycode = KEY_SWITCHVIDEOMODE;
2152 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
2153 acpi_bus_generate_proc_event(device, event, 0);
2154 keycode = KEY_VIDEO_NEXT;
2156 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
2157 acpi_bus_generate_proc_event(device, event, 0);
2158 keycode = KEY_VIDEO_PREV;
2162 keycode = KEY_UNKNOWN;
2163 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2164 "Unsupported event [0x%x]\n", event));
2168 acpi_notifier_call_chain(device, event, 0);
2169 input_report_key(input, keycode, 1);
2171 input_report_key(input, keycode, 0);
2177 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
2179 struct acpi_video_device *video_device = data;
2180 struct acpi_device *device = NULL;
2181 struct acpi_video_bus *bus;
2182 struct input_dev *input;
2188 device = video_device->dev;
2189 bus = video_device->video;
2193 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
2194 if (brightness_switch_enabled)
2195 acpi_video_switch_brightness(video_device, event);
2196 acpi_bus_generate_proc_event(device, event, 0);
2197 keycode = KEY_BRIGHTNESS_CYCLE;
2199 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
2200 if (brightness_switch_enabled)
2201 acpi_video_switch_brightness(video_device, event);
2202 acpi_bus_generate_proc_event(device, event, 0);
2203 keycode = KEY_BRIGHTNESSUP;
2205 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
2206 if (brightness_switch_enabled)
2207 acpi_video_switch_brightness(video_device, event);
2208 acpi_bus_generate_proc_event(device, event, 0);
2209 keycode = KEY_BRIGHTNESSDOWN;
2211 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
2212 if (brightness_switch_enabled)
2213 acpi_video_switch_brightness(video_device, event);
2214 acpi_bus_generate_proc_event(device, event, 0);
2215 keycode = KEY_BRIGHTNESS_ZERO;
2217 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
2218 if (brightness_switch_enabled)
2219 acpi_video_switch_brightness(video_device, event);
2220 acpi_bus_generate_proc_event(device, event, 0);
2221 keycode = KEY_DISPLAY_OFF;
2224 keycode = KEY_UNKNOWN;
2225 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2226 "Unsupported event [0x%x]\n", event));
2230 acpi_notifier_call_chain(device, event, 0);
2231 input_report_key(input, keycode, 1);
2233 input_report_key(input, keycode, 0);
2239 static int instance;
2240 static int acpi_video_resume(struct acpi_device *device)
2242 struct acpi_video_bus *video;
2243 struct acpi_video_device *video_device;
2246 if (!device || !acpi_driver_data(device))
2249 video = acpi_driver_data(device);
2251 for (i = 0; i < video->attached_count; i++) {
2252 video_device = video->attached_array[i].bind_info;
2253 if (video_device && video_device->backlight)
2254 acpi_video_set_brightness(video_device->backlight);
2260 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
2261 void **return_value)
2263 struct acpi_device *device = context;
2264 struct acpi_device *sibling;
2267 if (handle == device->handle)
2268 return AE_CTRL_TERMINATE;
2270 result = acpi_bus_get_device(handle, &sibling);
2274 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
2275 return AE_ALREADY_EXISTS;
2280 static int acpi_video_bus_add(struct acpi_device *device)
2282 struct acpi_video_bus *video;
2283 struct input_dev *input;
2287 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
2288 device->parent->handle, 1,
2289 acpi_video_bus_match, NULL,
2291 if (status == AE_ALREADY_EXISTS) {
2292 printk(KERN_WARNING FW_BUG
2293 "Duplicate ACPI video bus devices for the"
2294 " same VGA controller, please try module "
2295 "parameter \"video.allow_duplicates=1\""
2296 "if the current driver doesn't work.\n");
2297 if (!allow_duplicates)
2301 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2305 /* a hack to fix the duplicate name "VID" problem on T61 */
2306 if (!strcmp(device->pnp.bus_id, "VID")) {
2308 device->pnp.bus_id[3] = '0' + instance;
2311 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2312 if (!strcmp(device->pnp.bus_id, "VGA")) {
2314 device->pnp.bus_id[3] = '0' + instance;
2318 video->device = device;
2319 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2320 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2321 device->driver_data = video;
2323 acpi_video_bus_find_cap(video);
2324 error = acpi_video_bus_check(video);
2326 goto err_free_video;
2328 error = acpi_video_bus_add_fs(device);
2330 goto err_free_video;
2332 mutex_init(&video->device_list_lock);
2333 INIT_LIST_HEAD(&video->video_device_list);
2335 acpi_video_bus_get_devices(video, device);
2336 acpi_video_bus_start_devices(video);
2338 video->input = input = input_allocate_device();
2341 goto err_stop_video;
2344 snprintf(video->phys, sizeof(video->phys),
2345 "%s/video/input0", acpi_device_hid(video->device));
2347 input->name = acpi_device_name(video->device);
2348 input->phys = video->phys;
2349 input->id.bustype = BUS_HOST;
2350 input->id.product = 0x06;
2351 input->dev.parent = &device->dev;
2352 input->evbit[0] = BIT(EV_KEY);
2353 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2354 set_bit(KEY_VIDEO_NEXT, input->keybit);
2355 set_bit(KEY_VIDEO_PREV, input->keybit);
2356 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2357 set_bit(KEY_BRIGHTNESSUP, input->keybit);
2358 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2359 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2360 set_bit(KEY_DISPLAY_OFF, input->keybit);
2361 set_bit(KEY_UNKNOWN, input->keybit);
2363 error = input_register_device(input);
2365 goto err_free_input_dev;
2367 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
2368 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2369 video->flags.multihead ? "yes" : "no",
2370 video->flags.rom ? "yes" : "no",
2371 video->flags.post ? "yes" : "no");
2376 input_free_device(input);
2378 acpi_video_bus_stop_devices(video);
2379 acpi_video_bus_put_devices(video);
2380 kfree(video->attached_array);
2381 acpi_video_bus_remove_fs(device);
2384 device->driver_data = NULL;
2389 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2391 struct acpi_video_bus *video = NULL;
2394 if (!device || !acpi_driver_data(device))
2397 video = acpi_driver_data(device);
2399 acpi_video_bus_stop_devices(video);
2400 acpi_video_bus_put_devices(video);
2401 acpi_video_bus_remove_fs(device);
2403 input_unregister_device(video->input);
2404 kfree(video->attached_array);
2410 static int __init intel_opregion_present(void)
2412 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
2413 struct pci_dev *dev = NULL;
2416 for_each_pci_dev(dev) {
2417 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2419 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2421 pci_read_config_dword(dev, 0xfc, &address);
2430 int acpi_video_register(void)
2433 if (register_count) {
2435 * if the function of acpi_video_register is already called,
2436 * don't register the acpi_vide_bus again and return no error.
2441 acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2442 if (!acpi_video_dir)
2445 result = acpi_bus_register_driver(&acpi_video_bus);
2447 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2452 * When the acpi_video_bus is loaded successfully, increase
2453 * the counter reference.
2459 EXPORT_SYMBOL(acpi_video_register);
2461 void acpi_video_unregister(void)
2463 if (!register_count) {
2465 * If the acpi video bus is already unloaded, don't
2466 * unload it again and return directly.
2470 acpi_bus_unregister_driver(&acpi_video_bus);
2472 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2478 EXPORT_SYMBOL(acpi_video_unregister);
2481 * This is kind of nasty. Hardware using Intel chipsets may require
2482 * the video opregion code to be run first in order to initialise
2483 * state before any ACPI video calls are made. To handle this we defer
2484 * registration of the video class until the opregion code has run.
2487 static int __init acpi_video_init(void)
2489 dmi_check_system(video_dmi_table);
2491 if (intel_opregion_present())
2494 return acpi_video_register();
2497 static void __exit acpi_video_exit(void)
2499 acpi_video_unregister();
2504 module_init(acpi_video_init);
2505 module_exit(acpi_video_exit);