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>
43 #include <linux/dmi.h>
44 #include <acpi/acpi_bus.h>
45 #include <acpi/acpi_drivers.h>
47 #define PREFIX "ACPI: "
49 #define ACPI_VIDEO_CLASS "video"
50 #define ACPI_VIDEO_BUS_NAME "Video Bus"
51 #define ACPI_VIDEO_DEVICE_NAME "Video Device"
52 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80
53 #define ACPI_VIDEO_NOTIFY_PROBE 0x81
54 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82
55 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
56 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
58 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
59 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
60 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
61 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
62 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
64 #define MAX_NAME_LEN 20
66 #define ACPI_VIDEO_DISPLAY_CRT 1
67 #define ACPI_VIDEO_DISPLAY_TV 2
68 #define ACPI_VIDEO_DISPLAY_DVI 3
69 #define ACPI_VIDEO_DISPLAY_LCD 4
71 #define _COMPONENT ACPI_VIDEO_COMPONENT
72 ACPI_MODULE_NAME("video");
74 MODULE_AUTHOR("Bruno Ducrot");
75 MODULE_DESCRIPTION("ACPI Video Driver");
76 MODULE_LICENSE("GPL");
78 static int brightness_switch_enabled = 1;
79 module_param(brightness_switch_enabled, bool, 0644);
82 * By default, we don't allow duplicate ACPI video bus devices
83 * under the same VGA controller
85 static int allow_duplicates;
86 module_param(allow_duplicates, bool, 0644);
88 static int register_count = 0;
89 static int acpi_video_bus_add(struct acpi_device *device);
90 static int acpi_video_bus_remove(struct acpi_device *device, int type);
91 static int acpi_video_resume(struct acpi_device *device);
92 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
94 static const struct acpi_device_id video_device_ids[] = {
98 MODULE_DEVICE_TABLE(acpi, video_device_ids);
100 static struct acpi_driver acpi_video_bus = {
102 .class = ACPI_VIDEO_CLASS,
103 .ids = video_device_ids,
105 .add = acpi_video_bus_add,
106 .remove = acpi_video_bus_remove,
107 .resume = acpi_video_resume,
108 .notify = acpi_video_bus_notify,
112 struct acpi_video_bus_flags {
113 u8 multihead:1; /* can switch video heads */
114 u8 rom:1; /* can retrieve a video rom */
115 u8 post:1; /* can configure the head to */
119 struct acpi_video_bus_cap {
120 u8 _DOS:1; /*Enable/Disable output switching */
121 u8 _DOD:1; /*Enumerate all devices attached to display adapter */
122 u8 _ROM:1; /*Get ROM Data */
123 u8 _GPD:1; /*Get POST Device */
124 u8 _SPD:1; /*Set POST Device */
125 u8 _VPO:1; /*Video POST Options */
129 struct acpi_video_device_attrib {
130 u32 display_index:4; /* A zero-based instance of the Display */
131 u32 display_port_attachment:4; /*This field differentiates the display type */
132 u32 display_type:4; /*Describe the specific type in use */
133 u32 vendor_specific:4; /*Chipset Vendor Specific */
134 u32 bios_can_detect:1; /*BIOS can detect the device */
135 u32 depend_on_vga:1; /*Non-VGA output device whose power is related to
137 u32 pipe_id:3; /*For VGA multiple-head devices. */
138 u32 reserved:10; /*Must be 0 */
139 u32 device_id_scheme:1; /*Device ID Scheme */
142 struct acpi_video_enumerated_device {
145 struct acpi_video_device_attrib attrib;
147 struct acpi_video_device *bind_info;
150 struct acpi_video_bus {
151 struct acpi_device *device;
153 struct acpi_video_enumerated_device *attached_array;
155 struct acpi_video_bus_cap cap;
156 struct acpi_video_bus_flags flags;
157 struct list_head video_device_list;
158 struct mutex device_list_lock; /* protects video_device_list */
159 struct proc_dir_entry *dir;
160 struct input_dev *input;
161 char phys[32]; /* for input device */
164 struct acpi_video_device_flags {
174 struct acpi_video_device_cap {
175 u8 _ADR:1; /*Return the unique ID */
176 u8 _BCL:1; /*Query list of brightness control levels supported */
177 u8 _BCM:1; /*Set the brightness level */
178 u8 _BQC:1; /* Get current brightness level */
179 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
180 u8 _DDC:1; /*Return the EDID for this device */
181 u8 _DCS:1; /*Return status of output device */
182 u8 _DGS:1; /*Query graphics state */
183 u8 _DSS:1; /*Device state set */
186 struct acpi_video_brightness_flags {
187 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
188 u8 _BCL_reversed:1; /* _BCL package is in a reversed order*/
189 u8 _BCL_use_index:1; /* levels in _BCL are index values */
190 u8 _BCM_use_index:1; /* input of _BCM is an index value */
191 u8 _BQC_use_index:1; /* _BQC returns an index value */
194 struct acpi_video_device_brightness {
198 struct acpi_video_brightness_flags flags;
201 struct acpi_video_device {
202 unsigned long device_id;
203 struct acpi_video_device_flags flags;
204 struct acpi_video_device_cap cap;
205 struct list_head entry;
206 struct acpi_video_bus *video;
207 struct acpi_device *dev;
208 struct acpi_video_device_brightness *brightness;
209 struct backlight_device *backlight;
210 struct thermal_cooling_device *cooling_dev;
211 struct output_device *output_dev;
215 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
216 static const struct file_operations acpi_video_bus_info_fops = {
217 .owner = THIS_MODULE,
218 .open = acpi_video_bus_info_open_fs,
221 .release = single_release,
224 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
225 static const struct file_operations acpi_video_bus_ROM_fops = {
226 .owner = THIS_MODULE,
227 .open = acpi_video_bus_ROM_open_fs,
230 .release = single_release,
233 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
235 static const struct file_operations acpi_video_bus_POST_info_fops = {
236 .owner = THIS_MODULE,
237 .open = acpi_video_bus_POST_info_open_fs,
240 .release = single_release,
243 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
244 static ssize_t acpi_video_bus_write_POST(struct file *file,
245 const char __user *buffer, size_t count, loff_t *data);
246 static const struct file_operations acpi_video_bus_POST_fops = {
247 .owner = THIS_MODULE,
248 .open = acpi_video_bus_POST_open_fs,
250 .write = acpi_video_bus_write_POST,
252 .release = single_release,
255 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
256 static ssize_t acpi_video_bus_write_DOS(struct file *file,
257 const char __user *buffer, size_t count, loff_t *data);
258 static const struct file_operations acpi_video_bus_DOS_fops = {
259 .owner = THIS_MODULE,
260 .open = acpi_video_bus_DOS_open_fs,
262 .write = acpi_video_bus_write_DOS,
264 .release = single_release,
268 static int acpi_video_device_info_open_fs(struct inode *inode,
270 static const struct file_operations acpi_video_device_info_fops = {
271 .owner = THIS_MODULE,
272 .open = acpi_video_device_info_open_fs,
275 .release = single_release,
278 static int acpi_video_device_state_open_fs(struct inode *inode,
280 static ssize_t acpi_video_device_write_state(struct file *file,
281 const char __user *buffer, size_t count, loff_t *data);
282 static const struct file_operations acpi_video_device_state_fops = {
283 .owner = THIS_MODULE,
284 .open = acpi_video_device_state_open_fs,
286 .write = acpi_video_device_write_state,
288 .release = single_release,
291 static int acpi_video_device_brightness_open_fs(struct inode *inode,
293 static ssize_t acpi_video_device_write_brightness(struct file *file,
294 const char __user *buffer, size_t count, loff_t *data);
295 static const struct file_operations acpi_video_device_brightness_fops = {
296 .owner = THIS_MODULE,
297 .open = acpi_video_device_brightness_open_fs,
299 .write = acpi_video_device_write_brightness,
301 .release = single_release,
304 static int acpi_video_device_EDID_open_fs(struct inode *inode,
306 static const struct file_operations acpi_video_device_EDID_fops = {
307 .owner = THIS_MODULE,
308 .open = acpi_video_device_EDID_open_fs,
311 .release = single_release,
314 static const char device_decode[][30] = {
315 "motherboard VGA device",
321 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
322 static void acpi_video_device_rebind(struct acpi_video_bus *video);
323 static void acpi_video_device_bind(struct acpi_video_bus *video,
324 struct acpi_video_device *device);
325 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
326 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
328 static int acpi_video_device_lcd_get_level_current(
329 struct acpi_video_device *device,
330 unsigned long long *level);
331 static int acpi_video_get_next_level(struct acpi_video_device *device,
332 u32 level_current, u32 event);
333 static int acpi_video_switch_brightness(struct acpi_video_device *device,
335 static int acpi_video_device_get_state(struct acpi_video_device *device,
336 unsigned long long *state);
337 static int acpi_video_output_get(struct output_device *od);
338 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
340 /*backlight device sysfs support*/
341 static int acpi_video_get_brightness(struct backlight_device *bd)
343 unsigned long long cur_level;
345 struct acpi_video_device *vd =
346 (struct acpi_video_device *)bl_get_data(bd);
348 if (acpi_video_device_lcd_get_level_current(vd, &cur_level))
350 for (i = 2; i < vd->brightness->count; i++) {
351 if (vd->brightness->levels[i] == cur_level)
352 /* The first two entries are special - see page 575
353 of the ACPI spec 3.0 */
359 static int acpi_video_set_brightness(struct backlight_device *bd)
361 int request_level = bd->props.brightness + 2;
362 struct acpi_video_device *vd =
363 (struct acpi_video_device *)bl_get_data(bd);
365 return acpi_video_device_lcd_set_level(vd,
366 vd->brightness->levels[request_level]);
369 static struct backlight_ops acpi_backlight_ops = {
370 .get_brightness = acpi_video_get_brightness,
371 .update_status = acpi_video_set_brightness,
374 /*video output device sysfs support*/
375 static int acpi_video_output_get(struct output_device *od)
377 unsigned long long state;
378 struct acpi_video_device *vd =
379 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
380 acpi_video_device_get_state(vd, &state);
384 static int acpi_video_output_set(struct output_device *od)
386 unsigned long state = od->request_state;
387 struct acpi_video_device *vd=
388 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
389 return acpi_video_device_set_state(vd, state);
392 static struct output_properties acpi_output_properties = {
393 .set_state = acpi_video_output_set,
394 .get_status = acpi_video_output_get,
398 /* thermal cooling device callbacks */
399 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
402 struct acpi_device *device = cooling_dev->devdata;
403 struct acpi_video_device *video = acpi_driver_data(device);
405 *state = video->brightness->count - 3;
409 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
412 struct acpi_device *device = cooling_dev->devdata;
413 struct acpi_video_device *video = acpi_driver_data(device);
414 unsigned long long level;
417 if (acpi_video_device_lcd_get_level_current(video, &level))
419 for (offset = 2; offset < video->brightness->count; offset++)
420 if (level == video->brightness->levels[offset]) {
421 *state = video->brightness->count - offset - 1;
429 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
431 struct acpi_device *device = cooling_dev->devdata;
432 struct acpi_video_device *video = acpi_driver_data(device);
435 if ( state >= video->brightness->count - 2)
438 state = video->brightness->count - state;
439 level = video->brightness->levels[state -1];
440 return acpi_video_device_lcd_set_level(video, level);
443 static struct thermal_cooling_device_ops video_cooling_ops = {
444 .get_max_state = video_get_max_state,
445 .get_cur_state = video_get_cur_state,
446 .set_cur_state = video_set_cur_state,
449 /* --------------------------------------------------------------------------
451 -------------------------------------------------------------------------- */
456 acpi_video_device_query(struct acpi_video_device *device, unsigned long long *state)
460 status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
466 acpi_video_device_get_state(struct acpi_video_device *device,
467 unsigned long long *state)
471 status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
477 acpi_video_device_set_state(struct acpi_video_device *device, int state)
480 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
481 struct acpi_object_list args = { 1, &arg0 };
482 unsigned long long ret;
485 arg0.integer.value = state;
486 status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
492 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
493 union acpi_object **levels)
496 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
497 union acpi_object *obj;
502 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
503 if (!ACPI_SUCCESS(status))
505 obj = (union acpi_object *)buffer.pointer;
506 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
507 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
517 kfree(buffer.pointer);
523 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
526 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
527 struct acpi_object_list args = { 1, &arg0 };
530 arg0.integer.value = level;
532 status = acpi_evaluate_object(device->dev->handle, "_BCM",
534 if (ACPI_FAILURE(status)) {
535 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
539 device->brightness->curr = level;
540 for (state = 2; state < device->brightness->count; state++)
541 if (level == device->brightness->levels[state]) {
542 if (device->backlight)
543 device->backlight->props.brightness = state - 2;
547 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
552 * For some buggy _BQC methods, we need to add a constant value to
553 * the _BQC return value to get the actual current brightness level
556 static int bqc_offset_aml_bug_workaround;
557 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
559 bqc_offset_aml_bug_workaround = 9;
563 static struct dmi_system_id video_dmi_table[] __initdata = {
565 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
568 .callback = video_set_bqc_offset,
569 .ident = "Acer Aspire 5720",
571 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
572 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
576 .callback = video_set_bqc_offset,
577 .ident = "Acer Aspire 5710Z",
579 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
580 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
584 .callback = video_set_bqc_offset,
585 .ident = "eMachines E510",
587 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
588 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
592 .callback = video_set_bqc_offset,
593 .ident = "Acer Aspire 5315",
595 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
596 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
600 .callback = video_set_bqc_offset,
601 .ident = "Acer Aspire 7720",
603 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
604 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
611 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
612 unsigned long long *level)
614 acpi_status status = AE_OK;
617 if (device->cap._BQC || device->cap._BCQ) {
618 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
620 status = acpi_evaluate_integer(device->dev->handle, buf,
622 if (ACPI_SUCCESS(status)) {
623 if (device->brightness->flags._BQC_use_index) {
624 if (device->brightness->flags._BCL_reversed)
625 *level = device->brightness->count
627 *level = device->brightness->levels[*level + 2];
630 *level += bqc_offset_aml_bug_workaround;
631 for (i = 2; i < device->brightness->count; i++)
632 if (device->brightness->levels[i] == *level) {
633 device->brightness->curr = *level;
636 /* BQC returned an invalid level. Stop using it. */
637 ACPI_WARNING((AE_INFO, "%s returned an invalid level",
639 device->cap._BQC = device->cap._BCQ = 0;
642 * should we return an error or ignore this failure?
643 * dev->brightness->curr is a cached value which stores
644 * the correct current backlight level in most cases.
645 * ACPI video backlight still works w/ buggy _BQC.
646 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
648 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
649 device->cap._BQC = device->cap._BCQ = 0;
653 *level = device->brightness->curr;
658 acpi_video_device_EDID(struct acpi_video_device *device,
659 union acpi_object **edid, ssize_t length)
662 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
663 union acpi_object *obj;
664 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
665 struct acpi_object_list args = { 1, &arg0 };
673 arg0.integer.value = 1;
674 else if (length == 256)
675 arg0.integer.value = 2;
679 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
680 if (ACPI_FAILURE(status))
683 obj = buffer.pointer;
685 if (obj && obj->type == ACPI_TYPE_BUFFER)
688 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
699 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
702 unsigned long long tmp;
703 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
704 struct acpi_object_list args = { 1, &arg0 };
707 arg0.integer.value = option;
709 status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
710 if (ACPI_SUCCESS(status))
711 status = tmp ? (-EINVAL) : (AE_OK);
717 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long long *id)
721 status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
727 acpi_video_bus_POST_options(struct acpi_video_bus *video,
728 unsigned long long *options)
732 status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
740 * video : video bus device pointer
742 * 0. The system BIOS should NOT automatically switch(toggle)
743 * the active display output.
744 * 1. The system BIOS should automatically switch (toggle) the
745 * active display output. No switch event.
746 * 2. The _DGS value should be locked.
747 * 3. The system BIOS should not automatically switch (toggle) the
748 * active display output, but instead generate the display switch
751 * 0. The system BIOS should automatically control the brightness level
752 * of the LCD when the power changes from AC to DC
753 * 1. The system BIOS should NOT automatically control the brightness
754 * level of the LCD when the power changes from AC to DC.
760 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
762 acpi_integer status = 0;
763 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
764 struct acpi_object_list args = { 1, &arg0 };
767 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
771 arg0.integer.value = (lcd_flag << 2) | bios_flag;
772 video->dos_setting = arg0.integer.value;
773 acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
780 * Simple comparison function used to sort backlight levels.
784 acpi_video_cmp_level(const void *a, const void *b)
786 return *(int *)a - *(int *)b;
791 * device : video output device (LCD, CRT, ..)
794 * Maximum brightness level
796 * Allocate and initialize device->brightness.
800 acpi_video_init_brightness(struct acpi_video_device *device)
802 union acpi_object *obj = NULL;
803 int i, max_level = 0, count = 0, level_ac_battery = 0;
804 unsigned long long level, level_old;
805 union acpi_object *o;
806 struct acpi_video_device_brightness *br = NULL;
807 int result = -EINVAL;
809 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
810 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
811 "LCD brightness level\n"));
815 if (obj->package.count < 2)
818 br = kzalloc(sizeof(*br), GFP_KERNEL);
820 printk(KERN_ERR "can't allocate memory\n");
825 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
832 for (i = 0; i < obj->package.count; i++) {
833 o = (union acpi_object *)&obj->package.elements[i];
834 if (o->type != ACPI_TYPE_INTEGER) {
835 printk(KERN_ERR PREFIX "Invalid data\n");
838 br->levels[count] = (u32) o->integer.value;
840 if (br->levels[count] > max_level)
841 max_level = br->levels[count];
846 * some buggy BIOS don't export the levels
847 * when machine is on AC/Battery in _BCL package.
848 * In this case, the first two elements in _BCL packages
849 * are also supported brightness levels that OS should take care of.
851 for (i = 2; i < count; i++) {
852 if (br->levels[i] == br->levels[0])
854 if (br->levels[i] == br->levels[1])
858 if (level_ac_battery < 2) {
859 level_ac_battery = 2 - level_ac_battery;
860 br->flags._BCL_no_ac_battery_levels = 1;
861 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
862 br->levels[i] = br->levels[i - level_ac_battery];
863 count += level_ac_battery;
864 } else if (level_ac_battery > 2)
865 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
867 /* Check if the _BCL package is in a reversed order */
868 if (max_level == br->levels[2]) {
869 br->flags._BCL_reversed = 1;
870 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
871 acpi_video_cmp_level, NULL);
872 } else if (max_level != br->levels[count - 1])
874 "Found unordered _BCL package\n"));
877 device->brightness = br;
879 /* Check the input/output of _BQC/_BCL/_BCM */
880 if ((max_level < 100) && (max_level <= (count - 2)))
881 br->flags._BCL_use_index = 1;
884 * _BCM is always consistent with _BCL,
885 * at least for all the laptops we have ever seen.
887 br->flags._BCM_use_index = br->flags._BCL_use_index;
889 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
890 br->curr = level = max_level;
892 if (!device->cap._BQC)
895 result = acpi_video_device_lcd_get_level_current(device, &level_old);
897 goto out_free_levels;
900 * Set the level to maximum and check if _BQC uses indexed value
902 result = acpi_video_device_lcd_set_level(device, max_level);
904 goto out_free_levels;
906 result = acpi_video_device_lcd_get_level_current(device, &level);
908 goto out_free_levels;
910 br->flags._BQC_use_index = (level == max_level ? 0 : 1);
912 if (!br->flags._BQC_use_index) {
914 * Set the backlight to the initial state.
915 * On some buggy laptops, _BQC returns an uninitialized value
916 * when invoked for the first time, i.e. level_old is invalid.
917 * set the backlight to max_level in this case
919 for (i = 2; i < br->count; i++)
920 if (level_old == br->levels[i])
925 if (br->flags._BCL_reversed)
926 level_old = (br->count - 1) - level_old;
927 level = br->levels[level_old];
930 result = acpi_video_device_lcd_set_level(device, level);
932 goto out_free_levels;
934 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
935 "found %d brightness levels\n", count - 2));
944 device->brightness = NULL;
951 * device : video output device (LCD, CRT, ..)
956 * Find out all required AML methods defined under the output
960 static void acpi_video_device_find_cap(struct acpi_video_device *device)
962 acpi_handle h_dummy1;
964 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
965 device->cap._ADR = 1;
967 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
968 device->cap._BCL = 1;
970 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
971 device->cap._BCM = 1;
973 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
974 device->cap._BQC = 1;
975 else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
977 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
978 device->cap._BCQ = 1;
981 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
982 device->cap._DDC = 1;
984 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
985 device->cap._DCS = 1;
987 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
988 device->cap._DGS = 1;
990 if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
991 device->cap._DSS = 1;
994 if (acpi_video_backlight_support()) {
996 static int count = 0;
999 result = acpi_video_init_brightness(device);
1002 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
1006 sprintf(name, "acpi_video%d", count++);
1007 device->backlight = backlight_device_register(name,
1008 NULL, device, &acpi_backlight_ops);
1009 device->backlight->props.max_brightness = device->brightness->count-3;
1012 result = sysfs_create_link(&device->backlight->dev.kobj,
1013 &device->dev->dev.kobj, "device");
1015 printk(KERN_ERR PREFIX "Create sysfs link\n");
1017 device->cooling_dev = thermal_cooling_device_register("LCD",
1018 device->dev, &video_cooling_ops);
1019 if (IS_ERR(device->cooling_dev)) {
1021 * Set cooling_dev to NULL so we don't crash trying to
1023 * Also, why the hell we are returning early and
1024 * not attempt to register video output if cooling
1025 * device registration failed?
1028 device->cooling_dev = NULL;
1032 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1033 device->cooling_dev->id);
1034 result = sysfs_create_link(&device->dev->dev.kobj,
1035 &device->cooling_dev->device.kobj,
1038 printk(KERN_ERR PREFIX "Create sysfs link\n");
1039 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1040 &device->dev->dev.kobj, "device");
1042 printk(KERN_ERR PREFIX "Create sysfs link\n");
1046 if (acpi_video_display_switch_support()) {
1048 if (device->cap._DCS && device->cap._DSS) {
1051 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
1054 sprintf(name, "acpi_video%d", count++);
1055 device->output_dev = video_output_register(name,
1056 NULL, device, &acpi_output_properties);
1064 * device : video output device (VGA)
1069 * Find out all required AML methods defined under the video bus device.
1072 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1074 acpi_handle h_dummy1;
1076 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
1077 video->cap._DOS = 1;
1079 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
1080 video->cap._DOD = 1;
1082 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
1083 video->cap._ROM = 1;
1085 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
1086 video->cap._GPD = 1;
1088 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
1089 video->cap._SPD = 1;
1091 if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
1092 video->cap._VPO = 1;
1097 * Check whether the video bus device has required AML method to
1098 * support the desired features
1101 static int acpi_video_bus_check(struct acpi_video_bus *video)
1103 acpi_status status = -ENOENT;
1104 struct pci_dev *dev;
1109 dev = acpi_get_pci_dev(video->device->handle);
1114 /* Since there is no HID, CID and so on for VGA driver, we have
1115 * to check well known required nodes.
1118 /* Does this device support video switching? */
1119 if (video->cap._DOS || video->cap._DOD) {
1120 if (!video->cap._DOS) {
1121 printk(KERN_WARNING FW_BUG
1122 "ACPI(%s) defines _DOD but not _DOS\n",
1123 acpi_device_bid(video->device));
1125 video->flags.multihead = 1;
1129 /* Does this device support retrieving a video ROM? */
1130 if (video->cap._ROM) {
1131 video->flags.rom = 1;
1135 /* Does this device support configuring which video device to POST? */
1136 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1137 video->flags.post = 1;
1144 /* --------------------------------------------------------------------------
1145 FS Interface (/proc)
1146 -------------------------------------------------------------------------- */
1148 static struct proc_dir_entry *acpi_video_dir;
1152 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
1154 struct acpi_video_device *dev = seq->private;
1160 seq_printf(seq, "device_id: 0x%04x\n", (u32) dev->device_id);
1161 seq_printf(seq, "type: ");
1163 seq_printf(seq, "CRT\n");
1164 else if (dev->flags.lcd)
1165 seq_printf(seq, "LCD\n");
1166 else if (dev->flags.tvout)
1167 seq_printf(seq, "TVOUT\n");
1168 else if (dev->flags.dvi)
1169 seq_printf(seq, "DVI\n");
1171 seq_printf(seq, "UNKNOWN\n");
1173 seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
1180 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
1182 return single_open(file, acpi_video_device_info_seq_show,
1186 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
1189 struct acpi_video_device *dev = seq->private;
1190 unsigned long long state;
1196 status = acpi_video_device_get_state(dev, &state);
1197 seq_printf(seq, "state: ");
1198 if (ACPI_SUCCESS(status))
1199 seq_printf(seq, "0x%02llx\n", state);
1201 seq_printf(seq, "<not supported>\n");
1203 status = acpi_video_device_query(dev, &state);
1204 seq_printf(seq, "query: ");
1205 if (ACPI_SUCCESS(status))
1206 seq_printf(seq, "0x%02llx\n", state);
1208 seq_printf(seq, "<not supported>\n");
1215 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
1217 return single_open(file, acpi_video_device_state_seq_show,
1222 acpi_video_device_write_state(struct file *file,
1223 const char __user * buffer,
1224 size_t count, loff_t * data)
1227 struct seq_file *m = file->private_data;
1228 struct acpi_video_device *dev = m->private;
1229 char str[12] = { 0 };
1233 if (!dev || count >= sizeof(str))
1236 if (copy_from_user(str, buffer, count))
1240 state = simple_strtoul(str, NULL, 0);
1241 state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
1243 status = acpi_video_device_set_state(dev, state);
1252 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
1254 struct acpi_video_device *dev = seq->private;
1258 if (!dev || !dev->brightness) {
1259 seq_printf(seq, "<not supported>\n");
1263 seq_printf(seq, "levels: ");
1264 for (i = 2; i < dev->brightness->count; i++)
1265 seq_printf(seq, " %d", dev->brightness->levels[i]);
1266 seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
1272 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1274 return single_open(file, acpi_video_device_brightness_seq_show,
1279 acpi_video_device_write_brightness(struct file *file,
1280 const char __user * buffer,
1281 size_t count, loff_t * data)
1283 struct seq_file *m = file->private_data;
1284 struct acpi_video_device *dev = m->private;
1285 char str[5] = { 0 };
1286 unsigned int level = 0;
1290 if (!dev || !dev->brightness || count >= sizeof(str))
1293 if (copy_from_user(str, buffer, count))
1297 level = simple_strtoul(str, NULL, 0);
1302 /* validate through the list of available levels */
1303 for (i = 2; i < dev->brightness->count; i++)
1304 if (level == dev->brightness->levels[i]) {
1305 if (!acpi_video_device_lcd_set_level(dev, level))
1313 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1315 struct acpi_video_device *dev = seq->private;
1318 union acpi_object *edid = NULL;
1324 status = acpi_video_device_EDID(dev, &edid, 128);
1325 if (ACPI_FAILURE(status)) {
1326 status = acpi_video_device_EDID(dev, &edid, 256);
1329 if (ACPI_FAILURE(status)) {
1333 if (edid && edid->type == ACPI_TYPE_BUFFER) {
1334 for (i = 0; i < edid->buffer.length; i++)
1335 seq_putc(seq, edid->buffer.pointer[i]);
1340 seq_printf(seq, "<not supported>\n");
1348 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1350 return single_open(file, acpi_video_device_EDID_seq_show,
1354 static int acpi_video_device_add_fs(struct acpi_device *device)
1356 struct proc_dir_entry *entry, *device_dir;
1357 struct acpi_video_device *vid_dev;
1359 vid_dev = acpi_driver_data(device);
1363 device_dir = proc_mkdir(acpi_device_bid(device),
1364 vid_dev->video->dir);
1369 entry = proc_create_data("info", S_IRUGO, device_dir,
1370 &acpi_video_device_info_fops, acpi_driver_data(device));
1372 goto err_remove_dir;
1375 entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1377 &acpi_video_device_state_fops,
1378 acpi_driver_data(device));
1380 goto err_remove_info;
1382 /* 'brightness' [R/W] */
1383 entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1385 &acpi_video_device_brightness_fops,
1386 acpi_driver_data(device));
1388 goto err_remove_state;
1391 entry = proc_create_data("EDID", S_IRUGO, device_dir,
1392 &acpi_video_device_EDID_fops,
1393 acpi_driver_data(device));
1395 goto err_remove_brightness;
1397 acpi_device_dir(device) = device_dir;
1401 err_remove_brightness:
1402 remove_proc_entry("brightness", device_dir);
1404 remove_proc_entry("state", device_dir);
1406 remove_proc_entry("info", device_dir);
1408 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1412 static int acpi_video_device_remove_fs(struct acpi_device *device)
1414 struct acpi_video_device *vid_dev;
1415 struct proc_dir_entry *device_dir;
1417 vid_dev = acpi_driver_data(device);
1418 if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1421 device_dir = acpi_device_dir(device);
1423 remove_proc_entry("info", device_dir);
1424 remove_proc_entry("state", device_dir);
1425 remove_proc_entry("brightness", device_dir);
1426 remove_proc_entry("EDID", device_dir);
1427 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1428 acpi_device_dir(device) = NULL;
1435 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1437 struct acpi_video_bus *video = seq->private;
1443 seq_printf(seq, "Switching heads: %s\n",
1444 video->flags.multihead ? "yes" : "no");
1445 seq_printf(seq, "Video ROM: %s\n",
1446 video->flags.rom ? "yes" : "no");
1447 seq_printf(seq, "Device to be POSTed on boot: %s\n",
1448 video->flags.post ? "yes" : "no");
1454 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1456 return single_open(file, acpi_video_bus_info_seq_show,
1460 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1462 struct acpi_video_bus *video = seq->private;
1468 printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1469 seq_printf(seq, "<TODO>\n");
1475 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1477 return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1480 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1482 struct acpi_video_bus *video = seq->private;
1483 unsigned long long options;
1490 status = acpi_video_bus_POST_options(video, &options);
1491 if (ACPI_SUCCESS(status)) {
1492 if (!(options & 1)) {
1493 printk(KERN_WARNING PREFIX
1494 "The motherboard VGA device is not listed as a possible POST device.\n");
1495 printk(KERN_WARNING PREFIX
1496 "This indicates a BIOS bug. Please contact the manufacturer.\n");
1498 printk(KERN_WARNING "%llx\n", options);
1499 seq_printf(seq, "can POST: <integrated video>");
1501 seq_printf(seq, " <PCI video>");
1503 seq_printf(seq, " <AGP video>");
1504 seq_putc(seq, '\n');
1506 seq_printf(seq, "<not supported>\n");
1512 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1514 return single_open(file, acpi_video_bus_POST_info_seq_show,
1518 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1520 struct acpi_video_bus *video = seq->private;
1522 unsigned long long id;
1528 status = acpi_video_bus_get_POST(video, &id);
1529 if (!ACPI_SUCCESS(status)) {
1530 seq_printf(seq, "<not supported>\n");
1533 seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1539 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1541 struct acpi_video_bus *video = seq->private;
1544 seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1549 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1551 return single_open(file, acpi_video_bus_POST_seq_show,
1555 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1557 return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1561 acpi_video_bus_write_POST(struct file *file,
1562 const char __user * buffer,
1563 size_t count, loff_t * data)
1566 struct seq_file *m = file->private_data;
1567 struct acpi_video_bus *video = m->private;
1568 char str[12] = { 0 };
1569 unsigned long long opt, options;
1572 if (!video || count >= sizeof(str))
1575 status = acpi_video_bus_POST_options(video, &options);
1576 if (!ACPI_SUCCESS(status))
1579 if (copy_from_user(str, buffer, count))
1583 opt = strtoul(str, NULL, 0);
1587 /* just in case an OEM 'forgot' the motherboard... */
1590 if (options & (1ul << opt)) {
1591 status = acpi_video_bus_set_POST(video, opt);
1592 if (!ACPI_SUCCESS(status))
1601 acpi_video_bus_write_DOS(struct file *file,
1602 const char __user * buffer,
1603 size_t count, loff_t * data)
1606 struct seq_file *m = file->private_data;
1607 struct acpi_video_bus *video = m->private;
1608 char str[12] = { 0 };
1612 if (!video || count >= sizeof(str))
1615 if (copy_from_user(str, buffer, count))
1619 opt = strtoul(str, NULL, 0);
1623 status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1625 if (!ACPI_SUCCESS(status))
1631 static int acpi_video_bus_add_fs(struct acpi_device *device)
1633 struct acpi_video_bus *video = acpi_driver_data(device);
1634 struct proc_dir_entry *device_dir;
1635 struct proc_dir_entry *entry;
1637 device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1642 entry = proc_create_data("info", S_IRUGO, device_dir,
1643 &acpi_video_bus_info_fops,
1644 acpi_driver_data(device));
1646 goto err_remove_dir;
1649 entry = proc_create_data("ROM", S_IRUGO, device_dir,
1650 &acpi_video_bus_ROM_fops,
1651 acpi_driver_data(device));
1653 goto err_remove_info;
1655 /* 'POST_info' [R] */
1656 entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1657 &acpi_video_bus_POST_info_fops,
1658 acpi_driver_data(device));
1660 goto err_remove_rom;
1663 entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1665 &acpi_video_bus_POST_fops,
1666 acpi_driver_data(device));
1668 goto err_remove_post_info;
1671 entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1673 &acpi_video_bus_DOS_fops,
1674 acpi_driver_data(device));
1676 goto err_remove_post;
1678 video->dir = acpi_device_dir(device) = device_dir;
1682 remove_proc_entry("POST", device_dir);
1683 err_remove_post_info:
1684 remove_proc_entry("POST_info", device_dir);
1686 remove_proc_entry("ROM", device_dir);
1688 remove_proc_entry("info", device_dir);
1690 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1694 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1696 struct proc_dir_entry *device_dir = acpi_device_dir(device);
1699 remove_proc_entry("info", device_dir);
1700 remove_proc_entry("ROM", device_dir);
1701 remove_proc_entry("POST_info", device_dir);
1702 remove_proc_entry("POST", device_dir);
1703 remove_proc_entry("DOS", device_dir);
1704 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1705 acpi_device_dir(device) = NULL;
1711 /* --------------------------------------------------------------------------
1713 -------------------------------------------------------------------------- */
1715 /* device interface */
1716 static struct acpi_video_device_attrib*
1717 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1719 struct acpi_video_enumerated_device *ids;
1722 for (i = 0; i < video->attached_count; i++) {
1723 ids = &video->attached_array[i];
1724 if ((ids->value.int_val & 0xffff) == device_id)
1725 return &ids->value.attrib;
1732 acpi_video_bus_get_one_device(struct acpi_device *device,
1733 struct acpi_video_bus *video)
1735 unsigned long long device_id;
1737 struct acpi_video_device *data;
1738 struct acpi_video_device_attrib* attribute;
1740 if (!device || !video)
1744 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1745 if (ACPI_SUCCESS(status)) {
1747 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1751 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1752 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1753 device->driver_data = data;
1755 data->device_id = device_id;
1756 data->video = video;
1759 attribute = acpi_video_get_device_attr(video, device_id);
1761 if((attribute != NULL) && attribute->device_id_scheme) {
1762 switch (attribute->display_type) {
1763 case ACPI_VIDEO_DISPLAY_CRT:
1764 data->flags.crt = 1;
1766 case ACPI_VIDEO_DISPLAY_TV:
1767 data->flags.tvout = 1;
1769 case ACPI_VIDEO_DISPLAY_DVI:
1770 data->flags.dvi = 1;
1772 case ACPI_VIDEO_DISPLAY_LCD:
1773 data->flags.lcd = 1;
1776 data->flags.unknown = 1;
1779 if(attribute->bios_can_detect)
1780 data->flags.bios = 1;
1782 data->flags.unknown = 1;
1784 acpi_video_device_bind(video, data);
1785 acpi_video_device_find_cap(data);
1787 status = acpi_install_notify_handler(device->handle,
1789 acpi_video_device_notify,
1791 if (ACPI_FAILURE(status)) {
1792 printk(KERN_ERR PREFIX
1793 "Error installing notify handler\n");
1794 if(data->brightness)
1795 kfree(data->brightness->levels);
1796 kfree(data->brightness);
1801 mutex_lock(&video->device_list_lock);
1802 list_add_tail(&data->entry, &video->video_device_list);
1803 mutex_unlock(&video->device_list_lock);
1805 acpi_video_device_add_fs(device);
1815 * video : video bus device
1820 * Enumerate the video device list of the video bus,
1821 * bind the ids with the corresponding video devices
1822 * under the video bus.
1825 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1827 struct acpi_video_device *dev;
1829 mutex_lock(&video->device_list_lock);
1831 list_for_each_entry(dev, &video->video_device_list, entry)
1832 acpi_video_device_bind(video, dev);
1834 mutex_unlock(&video->device_list_lock);
1839 * video : video bus device
1840 * device : video output device under the video
1846 * Bind the ids with the corresponding video devices
1847 * under the video bus.
1851 acpi_video_device_bind(struct acpi_video_bus *video,
1852 struct acpi_video_device *device)
1854 struct acpi_video_enumerated_device *ids;
1857 for (i = 0; i < video->attached_count; i++) {
1858 ids = &video->attached_array[i];
1859 if (device->device_id == (ids->value.int_val & 0xffff)) {
1860 ids->bind_info = device;
1861 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1868 * video : video bus device
1873 * Call _DOD to enumerate all devices attached to display adapter
1877 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1882 struct acpi_video_enumerated_device *active_list;
1883 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1884 union acpi_object *dod = NULL;
1885 union acpi_object *obj;
1887 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1888 if (!ACPI_SUCCESS(status)) {
1889 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1893 dod = buffer.pointer;
1894 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1895 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1900 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1901 dod->package.count));
1903 active_list = kcalloc(1 + dod->package.count,
1904 sizeof(struct acpi_video_enumerated_device),
1912 for (i = 0; i < dod->package.count; i++) {
1913 obj = &dod->package.elements[i];
1915 if (obj->type != ACPI_TYPE_INTEGER) {
1916 printk(KERN_ERR PREFIX
1917 "Invalid _DOD data in element %d\n", i);
1921 active_list[count].value.int_val = obj->integer.value;
1922 active_list[count].bind_info = NULL;
1923 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1924 (int)obj->integer.value));
1928 kfree(video->attached_array);
1930 video->attached_array = active_list;
1931 video->attached_count = count;
1934 kfree(buffer.pointer);
1939 acpi_video_get_next_level(struct acpi_video_device *device,
1940 u32 level_current, u32 event)
1942 int min, max, min_above, max_below, i, l, delta = 255;
1943 max = max_below = 0;
1944 min = min_above = 255;
1945 /* Find closest level to level_current */
1946 for (i = 2; i < device->brightness->count; i++) {
1947 l = device->brightness->levels[i];
1948 if (abs(l - level_current) < abs(delta)) {
1949 delta = l - level_current;
1954 /* Ajust level_current to closest available level */
1955 level_current += delta;
1956 for (i = 2; i < device->brightness->count; i++) {
1957 l = device->brightness->levels[i];
1962 if (l < min_above && l > level_current)
1964 if (l > max_below && l < level_current)
1969 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1970 return (level_current < max) ? min_above : min;
1971 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1972 return (level_current < max) ? min_above : max;
1973 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1974 return (level_current > min) ? max_below : min;
1975 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1976 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1979 return level_current;
1984 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1986 unsigned long long level_current, level_next;
1987 int result = -EINVAL;
1989 if (!device->brightness)
1992 result = acpi_video_device_lcd_get_level_current(device,
1997 level_next = acpi_video_get_next_level(device, level_current, event);
1999 result = acpi_video_device_lcd_set_level(device, level_next);
2002 backlight_force_update(device->backlight,
2003 BACKLIGHT_UPDATE_HOTKEY);
2007 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
2013 acpi_video_bus_get_devices(struct acpi_video_bus *video,
2014 struct acpi_device *device)
2017 struct acpi_device *dev;
2019 acpi_video_device_enumerate(video);
2021 list_for_each_entry(dev, &device->children, node) {
2023 status = acpi_video_bus_get_one_device(dev, video);
2024 if (ACPI_FAILURE(status)) {
2025 printk(KERN_WARNING PREFIX
2026 "Cant attach device");
2033 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
2036 struct acpi_video_bus *video;
2039 if (!device || !device->video)
2042 video = device->video;
2044 acpi_video_device_remove_fs(device->dev);
2046 status = acpi_remove_notify_handler(device->dev->handle,
2048 acpi_video_device_notify);
2049 if (device->backlight) {
2050 sysfs_remove_link(&device->backlight->dev.kobj, "device");
2051 backlight_device_unregister(device->backlight);
2052 device->backlight = NULL;
2054 if (device->cooling_dev) {
2055 sysfs_remove_link(&device->dev->dev.kobj,
2057 sysfs_remove_link(&device->cooling_dev->device.kobj,
2059 thermal_cooling_device_unregister(device->cooling_dev);
2060 device->cooling_dev = NULL;
2062 video_output_unregister(device->output_dev);
2067 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2070 struct acpi_video_device *dev, *next;
2072 mutex_lock(&video->device_list_lock);
2074 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2076 status = acpi_video_bus_put_one_device(dev);
2077 if (ACPI_FAILURE(status))
2078 printk(KERN_WARNING PREFIX
2079 "hhuuhhuu bug in acpi video driver.\n");
2081 if (dev->brightness) {
2082 kfree(dev->brightness->levels);
2083 kfree(dev->brightness);
2085 list_del(&dev->entry);
2089 mutex_unlock(&video->device_list_lock);
2094 /* acpi_video interface */
2096 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
2098 return acpi_video_bus_DOS(video, 0, 0);
2101 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
2103 return acpi_video_bus_DOS(video, 0, 1);
2106 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
2108 struct acpi_video_bus *video = acpi_driver_data(device);
2109 struct input_dev *input;
2115 input = video->input;
2118 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
2119 * most likely via hotkey. */
2120 acpi_bus_generate_proc_event(device, event, 0);
2121 keycode = KEY_SWITCHVIDEOMODE;
2124 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
2126 acpi_video_device_enumerate(video);
2127 acpi_video_device_rebind(video);
2128 acpi_bus_generate_proc_event(device, event, 0);
2129 keycode = KEY_SWITCHVIDEOMODE;
2132 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
2133 acpi_bus_generate_proc_event(device, event, 0);
2134 keycode = KEY_SWITCHVIDEOMODE;
2136 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
2137 acpi_bus_generate_proc_event(device, event, 0);
2138 keycode = KEY_VIDEO_NEXT;
2140 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
2141 acpi_bus_generate_proc_event(device, event, 0);
2142 keycode = KEY_VIDEO_PREV;
2146 keycode = KEY_UNKNOWN;
2147 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2148 "Unsupported event [0x%x]\n", event));
2152 acpi_notifier_call_chain(device, event, 0);
2153 input_report_key(input, keycode, 1);
2155 input_report_key(input, keycode, 0);
2161 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
2163 struct acpi_video_device *video_device = data;
2164 struct acpi_device *device = NULL;
2165 struct acpi_video_bus *bus;
2166 struct input_dev *input;
2172 device = video_device->dev;
2173 bus = video_device->video;
2177 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
2178 if (brightness_switch_enabled)
2179 acpi_video_switch_brightness(video_device, event);
2180 acpi_bus_generate_proc_event(device, event, 0);
2181 keycode = KEY_BRIGHTNESS_CYCLE;
2183 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
2184 if (brightness_switch_enabled)
2185 acpi_video_switch_brightness(video_device, event);
2186 acpi_bus_generate_proc_event(device, event, 0);
2187 keycode = KEY_BRIGHTNESSUP;
2189 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
2190 if (brightness_switch_enabled)
2191 acpi_video_switch_brightness(video_device, event);
2192 acpi_bus_generate_proc_event(device, event, 0);
2193 keycode = KEY_BRIGHTNESSDOWN;
2195 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
2196 if (brightness_switch_enabled)
2197 acpi_video_switch_brightness(video_device, event);
2198 acpi_bus_generate_proc_event(device, event, 0);
2199 keycode = KEY_BRIGHTNESS_ZERO;
2201 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
2202 if (brightness_switch_enabled)
2203 acpi_video_switch_brightness(video_device, event);
2204 acpi_bus_generate_proc_event(device, event, 0);
2205 keycode = KEY_DISPLAY_OFF;
2208 keycode = KEY_UNKNOWN;
2209 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2210 "Unsupported event [0x%x]\n", event));
2214 acpi_notifier_call_chain(device, event, 0);
2215 input_report_key(input, keycode, 1);
2217 input_report_key(input, keycode, 0);
2223 static int instance;
2224 static int acpi_video_resume(struct acpi_device *device)
2226 struct acpi_video_bus *video;
2227 struct acpi_video_device *video_device;
2230 if (!device || !acpi_driver_data(device))
2233 video = acpi_driver_data(device);
2235 for (i = 0; i < video->attached_count; i++) {
2236 video_device = video->attached_array[i].bind_info;
2237 if (video_device && video_device->backlight)
2238 acpi_video_set_brightness(video_device->backlight);
2244 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
2245 void **return_value)
2247 struct acpi_device *device = context;
2248 struct acpi_device *sibling;
2251 if (handle == device->handle)
2252 return AE_CTRL_TERMINATE;
2254 result = acpi_bus_get_device(handle, &sibling);
2258 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
2259 return AE_ALREADY_EXISTS;
2264 static int acpi_video_bus_add(struct acpi_device *device)
2266 struct acpi_video_bus *video;
2267 struct input_dev *input;
2271 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
2272 device->parent->handle, 1,
2273 acpi_video_bus_match, NULL,
2275 if (status == AE_ALREADY_EXISTS) {
2276 printk(KERN_WARNING FW_BUG
2277 "Duplicate ACPI video bus devices for the"
2278 " same VGA controller, please try module "
2279 "parameter \"video.allow_duplicates=1\""
2280 "if the current driver doesn't work.\n");
2281 if (!allow_duplicates)
2285 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2289 /* a hack to fix the duplicate name "VID" problem on T61 */
2290 if (!strcmp(device->pnp.bus_id, "VID")) {
2292 device->pnp.bus_id[3] = '0' + instance;
2295 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2296 if (!strcmp(device->pnp.bus_id, "VGA")) {
2298 device->pnp.bus_id[3] = '0' + instance;
2302 video->device = device;
2303 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2304 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2305 device->driver_data = video;
2307 acpi_video_bus_find_cap(video);
2308 error = acpi_video_bus_check(video);
2310 goto err_free_video;
2312 error = acpi_video_bus_add_fs(device);
2314 goto err_free_video;
2316 mutex_init(&video->device_list_lock);
2317 INIT_LIST_HEAD(&video->video_device_list);
2319 acpi_video_bus_get_devices(video, device);
2320 acpi_video_bus_start_devices(video);
2322 video->input = input = input_allocate_device();
2325 goto err_stop_video;
2328 snprintf(video->phys, sizeof(video->phys),
2329 "%s/video/input0", acpi_device_hid(video->device));
2331 input->name = acpi_device_name(video->device);
2332 input->phys = video->phys;
2333 input->id.bustype = BUS_HOST;
2334 input->id.product = 0x06;
2335 input->dev.parent = &device->dev;
2336 input->evbit[0] = BIT(EV_KEY);
2337 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2338 set_bit(KEY_VIDEO_NEXT, input->keybit);
2339 set_bit(KEY_VIDEO_PREV, input->keybit);
2340 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2341 set_bit(KEY_BRIGHTNESSUP, input->keybit);
2342 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2343 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2344 set_bit(KEY_DISPLAY_OFF, input->keybit);
2345 set_bit(KEY_UNKNOWN, input->keybit);
2347 error = input_register_device(input);
2349 goto err_free_input_dev;
2351 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
2352 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2353 video->flags.multihead ? "yes" : "no",
2354 video->flags.rom ? "yes" : "no",
2355 video->flags.post ? "yes" : "no");
2360 input_free_device(input);
2362 acpi_video_bus_stop_devices(video);
2363 acpi_video_bus_put_devices(video);
2364 kfree(video->attached_array);
2365 acpi_video_bus_remove_fs(device);
2368 device->driver_data = NULL;
2373 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2375 struct acpi_video_bus *video = NULL;
2378 if (!device || !acpi_driver_data(device))
2381 video = acpi_driver_data(device);
2383 acpi_video_bus_stop_devices(video);
2384 acpi_video_bus_put_devices(video);
2385 acpi_video_bus_remove_fs(device);
2387 input_unregister_device(video->input);
2388 kfree(video->attached_array);
2394 static int __init intel_opregion_present(void)
2396 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
2397 struct pci_dev *dev = NULL;
2400 for_each_pci_dev(dev) {
2401 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2403 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2405 pci_read_config_dword(dev, 0xfc, &address);
2414 int acpi_video_register(void)
2417 if (register_count) {
2419 * if the function of acpi_video_register is already called,
2420 * don't register the acpi_vide_bus again and return no error.
2425 acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2426 if (!acpi_video_dir)
2429 result = acpi_bus_register_driver(&acpi_video_bus);
2431 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2436 * When the acpi_video_bus is loaded successfully, increase
2437 * the counter reference.
2443 EXPORT_SYMBOL(acpi_video_register);
2445 void acpi_video_unregister(void)
2447 if (!register_count) {
2449 * If the acpi video bus is already unloaded, don't
2450 * unload it again and return directly.
2454 acpi_bus_unregister_driver(&acpi_video_bus);
2456 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2462 EXPORT_SYMBOL(acpi_video_unregister);
2465 * This is kind of nasty. Hardware using Intel chipsets may require
2466 * the video opregion code to be run first in order to initialise
2467 * state before any ACPI video calls are made. To handle this we defer
2468 * registration of the video class until the opregion code has run.
2471 static int __init acpi_video_init(void)
2473 dmi_check_system(video_dmi_table);
2475 if (intel_opregion_present())
2478 return acpi_video_register();
2481 static void __exit acpi_video_exit(void)
2483 acpi_video_unregister();
2488 module_init(acpi_video_init);
2489 module_exit(acpi_video_exit);