3  *  video.c - ACPI Video Driver
10 #define pr_fmt(fmt) "ACPI: video: " fmt
28 #include <acpi/video.h>
31 #define ACPI_VIDEO_BUS_NAME		"Video Bus"
32 #define ACPI_VIDEO_DEVICE_NAME		"Video Device"
37 MODULE_DESCRIPTION("ACPI Video Driver");
44  * By default, we don't allow duplicate ACPI video bus devices
101 	.name = "video",
111 	u8 multihead:1;		/* can switch video heads */
112 	u8 rom:1;		/* can retrieve a video rom */
123 	u8 _VPO:1;		/* Video POST Options */
200 	struct acpi_video_bus *video;  member
208 static void acpi_video_device_rebind(struct acpi_video_bus *video);
209 static void acpi_video_device_bind(struct acpi_video_bus *video,
211 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
256 	struct acpi_video_device *video = cooling_dev->devdata;  in video_get_max_state()  local
258 	*state = video->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1;  in video_get_max_state()
265 	struct acpi_video_device *video = cooling_dev->devdata;  in video_get_cur_state()  local
269 	if (acpi_video_device_lcd_get_level_current(video, &level, false))  in video_get_cur_state()
271 	for (offset = ACPI_VIDEO_FIRST_LEVEL; offset < video->brightness->count;  in video_get_cur_state()
273 		if (level == video->brightness->levels[offset]) {  in video_get_cur_state()
274 			*state = video->brightness->count - offset - 1;  in video_get_cur_state()
284 	struct acpi_video_device *video = cooling_dev->devdata;  in video_set_cur_state()  local
287 	if (state >= video->brightness->count - ACPI_VIDEO_FIRST_LEVEL)  in video_set_cur_state()
290 	state = video->brightness->count - state;  in video_set_cur_state()
291 	level = video->brightness->levels[state - 1];  in video_set_cur_state()
292 	return acpi_video_device_lcd_set_level(video, level);  in video_set_cur_state()
303  *                             Video Management
463 	 * Some machines have multiple video output devices, but only the one
465 	 * register backlight interface for other video output devices.
480 	 * events, in this case acpi-video is considered the canonical source
600 			 * ACPI video backlight still works w/ buggy _BQC.  in acpi_video_device_lcd_get_level_current()
655  *	video		: video bus device pointer
679 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)  in acpi_video_bus_DOS()  argument
683 	if (!video->cap._DOS)  in acpi_video_bus_DOS()
688 	video->dos_setting = (lcd_flag << 2) | bios_flag;  in acpi_video_bus_DOS()
689 	status = acpi_execute_simple_method(video->device->handle, "_DOS",  in acpi_video_bus_DOS()
896  *	device	: video output device (LCD, CRT, ..)
970  *	device	: video output device (LCD, CRT, ..)
1001  *	device	: video output device (VGA)
1006  *  Find out all required AML methods defined under the video bus device.
1009 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)  in acpi_video_bus_find_cap()  argument
1011 	if (acpi_has_method(video->device->handle, "_DOS"))  in acpi_video_bus_find_cap()
1012 		video->cap._DOS = 1;  in acpi_video_bus_find_cap()
1013 	if (acpi_has_method(video->device->handle, "_DOD"))  in acpi_video_bus_find_cap()
1014 		video->cap._DOD = 1;  in acpi_video_bus_find_cap()
1015 	if (acpi_has_method(video->device->handle, "_ROM"))  in acpi_video_bus_find_cap()
1016 		video->cap._ROM = 1;  in acpi_video_bus_find_cap()
1017 	if (acpi_has_method(video->device->handle, "_GPD"))  in acpi_video_bus_find_cap()
1018 		video->cap._GPD = 1;  in acpi_video_bus_find_cap()
1019 	if (acpi_has_method(video->device->handle, "_SPD"))  in acpi_video_bus_find_cap()
1020 		video->cap._SPD = 1;  in acpi_video_bus_find_cap()
1021 	if (acpi_has_method(video->device->handle, "_VPO"))  in acpi_video_bus_find_cap()
1022 		video->cap._VPO = 1;  in acpi_video_bus_find_cap()
1026  * Check whether the video bus device has required AML method to
1030 static int acpi_video_bus_check(struct acpi_video_bus *video)  in acpi_video_bus_check()  argument
1035 	if (!video)  in acpi_video_bus_check()
1038 	dev = acpi_get_pci_dev(video->device->handle);  in acpi_video_bus_check()
1048 	/* Does this device support video switching? */  in acpi_video_bus_check()
1049 	if (video->cap._DOS || video->cap._DOD) {  in acpi_video_bus_check()
1050 		if (!video->cap._DOS) {  in acpi_video_bus_check()
1052 				acpi_device_bid(video->device));  in acpi_video_bus_check()
1054 		video->flags.multihead = 1;  in acpi_video_bus_check()
1058 	/* Does this device support retrieving a video ROM? */  in acpi_video_bus_check()
1059 	if (video->cap._ROM) {  in acpi_video_bus_check()
1060 		video->flags.rom = 1;  in acpi_video_bus_check()
1064 	/* Does this device support configuring which video device to POST? */  in acpi_video_bus_check()
1065 	if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {  in acpi_video_bus_check()
1066 		video->flags.post = 1;  in acpi_video_bus_check()
1081 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)  in acpi_video_get_device_attr()  argument
1086 	for (i = 0; i < video->attached_count; i++) {  in acpi_video_get_device_attr()
1087 		ids = &video->attached_array[i];  in acpi_video_get_device_attr()
1096 acpi_video_get_device_type(struct acpi_video_bus *video,  in acpi_video_get_device_type()  argument
1102 	for (i = 0; i < video->attached_count; i++) {  in acpi_video_get_device_type()
1103 		ids = &video->attached_array[i];  in acpi_video_get_device_type()
1113 	struct acpi_video_bus *video = arg;  in acpi_video_bus_get_one_device()  local
1135 	data->video = video;  in acpi_video_bus_get_one_device()
1140 	attribute = acpi_video_get_device_attr(video, device_id);  in acpi_video_bus_get_one_device()
1164 		device_type = acpi_video_get_device_type(video, device_id);  in acpi_video_bus_get_one_device()
1181 	acpi_video_device_bind(video, data);  in acpi_video_bus_get_one_device()
1187 	mutex_lock(&video->device_list_lock);  in acpi_video_bus_get_one_device()
1188 	list_add_tail(&data->entry, &video->video_device_list);  in acpi_video_bus_get_one_device()
1189 	mutex_unlock(&video->device_list_lock);  in acpi_video_bus_get_one_device()
1192 	video->child_count++;  in acpi_video_bus_get_one_device()
1198  *	video	: video bus device
1203  *  Enumerate the video device list of the video bus,
1204  *  bind the ids with the corresponding video devices
1205  *  under the video bus.
1208 static void acpi_video_device_rebind(struct acpi_video_bus *video)  in acpi_video_device_rebind()  argument
1212 	mutex_lock(&video->device_list_lock);  in acpi_video_device_rebind()
1214 	list_for_each_entry(dev, &video->video_device_list, entry)  in acpi_video_device_rebind()
1215 		acpi_video_device_bind(video, dev);  in acpi_video_device_rebind()
1217 	mutex_unlock(&video->device_list_lock);  in acpi_video_device_rebind()
1222  *	video	: video bus device
1223  *	device	: video output device under the video
1229  *  Bind the ids with the corresponding video devices
1230  *  under the video bus.
1234 acpi_video_device_bind(struct acpi_video_bus *video,  in acpi_video_device_bind()  argument
1240 	for (i = 0; i < video->attached_count; i++) {  in acpi_video_device_bind()
1241 		ids = &video->attached_array[i];  in acpi_video_device_bind()
1244 			acpi_handle_debug(video->device->handle, "%s: %d\n",  in acpi_video_device_bind()
1252 	struct acpi_video_bus *video = device->video;  in acpi_video_device_in_dod()  local
1260 	if (!video->attached_count || video->child_count > 8)  in acpi_video_device_in_dod()
1263 	for (i = 0; i < video->attached_count; i++) {  in acpi_video_device_in_dod()
1264 		if ((video->attached_array[i].value.int_val & 0xfff) ==  in acpi_video_device_in_dod()
1274  *	video	: video bus device
1283 static int acpi_video_device_enumerate(struct acpi_video_bus *video)  in acpi_video_device_enumerate()  argument
1293 	if (!video->cap._DOD)  in acpi_video_device_enumerate()
1296 	status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);  in acpi_video_device_enumerate()
1298 		acpi_handle_info(video->device->handle,  in acpi_video_device_enumerate()
1306 		acpi_handle_info(video->device->handle, "Invalid _DOD data\n");  in acpi_video_device_enumerate()
1311 	acpi_handle_debug(video->device->handle, "Found %d video heads in _DOD\n",  in acpi_video_device_enumerate()
1327 			acpi_handle_info(video->device->handle,  in acpi_video_device_enumerate()
1335 		acpi_handle_debug(video->device->handle,  in acpi_video_device_enumerate()
1342 	kfree(video->attached_array);  in acpi_video_device_enumerate()
1344 	video->attached_array = active_list;  in acpi_video_device_enumerate()
1345 	video->attached_count = count;  in acpi_video_device_enumerate()
1436 	struct acpi_video_bus *video;  in acpi_video_get_edid()  local
1445 	video = acpi_driver_data(device);  in acpi_video_get_edid()
1447 	for (i = 0; i < video->attached_count; i++) {  in acpi_video_get_edid()
1448 		video_device = video->attached_array[i].bind_info;  in acpi_video_get_edid()
1497 acpi_video_bus_get_devices(struct acpi_video_bus *video,  in acpi_video_bus_get_devices()  argument
1501 	 * There are systems where video module known to work fine regardless  in acpi_video_bus_get_devices()
1505 	acpi_video_device_enumerate(video);  in acpi_video_bus_get_devices()
1507 	return acpi_dev_for_each_child(device, acpi_video_bus_get_one_device, video);  in acpi_video_bus_get_devices()
1516 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)  in acpi_video_bus_start_devices()  argument
1518 	return acpi_video_bus_DOS(video, 0,  in acpi_video_bus_start_devices()
1522 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)  in acpi_video_bus_stop_devices()  argument
1524 	return acpi_video_bus_DOS(video, 0,  in acpi_video_bus_stop_devices()
1531 	struct acpi_video_bus *video = acpi_driver_data(device);  in acpi_video_bus_notify()  local
1535 	if (!video || !video->input)  in acpi_video_bus_notify()
1538 	input = video->input;  in acpi_video_bus_notify()
1546 	case ACPI_VIDEO_NOTIFY_PROBE:	/* User plugged in or removed a video  in acpi_video_bus_notify()
1548 		acpi_video_device_enumerate(video);  in acpi_video_bus_notify()
1549 		acpi_video_device_rebind(video);  in acpi_video_bus_notify()
1603 	bus = video_device->video;  in acpi_video_device_notify()
1656 	struct acpi_video_bus *video;  in acpi_video_resume()  local
1664 		video = container_of(nb, struct acpi_video_bus, pm_nb);  in acpi_video_resume()
1666 		dev_info(&video->device->dev, "Restoring backlight state\n");  in acpi_video_resume()
1668 		for (i = 0; i < video->attached_count; i++) {  in acpi_video_resume()
1669 			video_device = video->attached_array[i].bind_info;  in acpi_video_resume()
1755 		 * register video output if cooling device registration failed?  in acpi_video_dev_register_backlight()
1776 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)  in acpi_video_run_bcl_for_osi()  argument
1781 	mutex_lock(&video->device_list_lock);  in acpi_video_run_bcl_for_osi()
1782 	list_for_each_entry(dev, &video->video_device_list, entry) {  in acpi_video_run_bcl_for_osi()
1786 	mutex_unlock(&video->device_list_lock);  in acpi_video_run_bcl_for_osi()
1792 	 * Do not create backlight device for video output  in acpi_video_should_register_backlight()
1805 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)  in acpi_video_bus_register_backlight()  argument
1809 	if (video->backlight_registered)  in acpi_video_bus_register_backlight()
1815 	mutex_lock(&video->device_list_lock);  in acpi_video_bus_register_backlight()
1816 	list_for_each_entry(dev, &video->video_device_list, entry) {  in acpi_video_bus_register_backlight()
1820 	mutex_unlock(&video->device_list_lock);  in acpi_video_bus_register_backlight()
1822 	video->backlight_registered = true;  in acpi_video_bus_register_backlight()
1824 	video->pm_nb.notifier_call = acpi_video_resume;  in acpi_video_bus_register_backlight()
1825 	video->pm_nb.priority = 0;  in acpi_video_bus_register_backlight()
1826 	return register_pm_notifier(&video->pm_nb);  in acpi_video_bus_register_backlight()
1848 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)  in acpi_video_bus_unregister_backlight()  argument
1853 	if (!video->backlight_registered)  in acpi_video_bus_unregister_backlight()
1856 	error = unregister_pm_notifier(&video->pm_nb);  in acpi_video_bus_unregister_backlight()
1858 	mutex_lock(&video->device_list_lock);  in acpi_video_bus_unregister_backlight()
1859 	list_for_each_entry(dev, &video->video_device_list, entry)  in acpi_video_bus_unregister_backlight()
1861 	mutex_unlock(&video->device_list_lock);  in acpi_video_bus_unregister_backlight()
1863 	video->backlight_registered = false;  in acpi_video_bus_unregister_backlight()
1881 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)  in acpi_video_bus_add_notify_handler()  argument
1887 	video->input = input = input_allocate_device();  in acpi_video_bus_add_notify_handler()
1893 	error = acpi_video_bus_start_devices(video);  in acpi_video_bus_add_notify_handler()
1897 	snprintf(video->phys, sizeof(video->phys),  in acpi_video_bus_add_notify_handler()
1898 			"%s/video/input0", acpi_device_hid(video->device));  in acpi_video_bus_add_notify_handler()
1900 	input->name = acpi_device_name(video->device);  in acpi_video_bus_add_notify_handler()
1901 	input->phys = video->phys;  in acpi_video_bus_add_notify_handler()
1904 	input->dev.parent = &video->device->dev;  in acpi_video_bus_add_notify_handler()
1919 	mutex_lock(&video->device_list_lock);  in acpi_video_bus_add_notify_handler()
1920 	list_for_each_entry(dev, &video->video_device_list, entry)  in acpi_video_bus_add_notify_handler()
1922 	mutex_unlock(&video->device_list_lock);  in acpi_video_bus_add_notify_handler()
1927 	acpi_video_bus_stop_devices(video);  in acpi_video_bus_add_notify_handler()
1930 	video->input = NULL;  in acpi_video_bus_add_notify_handler()
1944 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)  in acpi_video_bus_remove_notify_handler()  argument
1948 	mutex_lock(&video->device_list_lock);  in acpi_video_bus_remove_notify_handler()
1949 	list_for_each_entry(dev, &video->video_device_list, entry)  in acpi_video_bus_remove_notify_handler()
1951 	mutex_unlock(&video->device_list_lock);  in acpi_video_bus_remove_notify_handler()
1953 	acpi_video_bus_stop_devices(video);  in acpi_video_bus_remove_notify_handler()
1954 	input_unregister_device(video->input);  in acpi_video_bus_remove_notify_handler()
1955 	video->input = NULL;  in acpi_video_bus_remove_notify_handler()
1958 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)  in acpi_video_bus_put_devices()  argument
1962 	mutex_lock(&video->device_list_lock);  in acpi_video_bus_put_devices()
1963 	list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {  in acpi_video_bus_put_devices()
1967 	mutex_unlock(&video->device_list_lock);  in acpi_video_bus_put_devices()
1976 	struct acpi_video_bus *video;  in acpi_video_bus_add()  local
1987 			"Duplicate ACPI video bus devices for the"  in acpi_video_bus_add()
1989 			"parameter \"video.allow_duplicates=1\""  in acpi_video_bus_add()
1995 	video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);  in acpi_video_bus_add()
1996 	if (!video)  in acpi_video_bus_add()
2012 	video->device = device;  in acpi_video_bus_add()
2015 	device->driver_data = video;  in acpi_video_bus_add()
2017 	acpi_video_bus_find_cap(video);  in acpi_video_bus_add()
2018 	error = acpi_video_bus_check(video);  in acpi_video_bus_add()
2022 	mutex_init(&video->device_list_lock);  in acpi_video_bus_add()
2023 	INIT_LIST_HEAD(&video->video_device_list);  in acpi_video_bus_add()
2025 	error = acpi_video_bus_get_devices(video, device);  in acpi_video_bus_add()
2030 	 * HP ZBook Fury 16 G10 requires ACPI video's child devices have _PS0  in acpi_video_bus_add()
2037 	       video->flags.multihead ? "yes" : "no",  in acpi_video_bus_add()
2038 	       video->flags.rom ? "yes" : "no",  in acpi_video_bus_add()
2039 	       video->flags.post ? "yes" : "no");  in acpi_video_bus_add()
2041 	list_add_tail(&video->entry, &video_bus_head);  in acpi_video_bus_add()
2046 	 * show up later and this may change the result from video to native.  in acpi_video_bus_add()
2054 	acpi_video_run_bcl_for_osi(video);  in acpi_video_bus_add()
2057 		acpi_video_bus_register_backlight(video);  in acpi_video_bus_add()
2059 	error = acpi_video_bus_add_notify_handler(video);  in acpi_video_bus_add()
2071 	acpi_video_bus_remove_notify_handler(video);  in acpi_video_bus_add()
2074 	list_del(&video->entry);  in acpi_video_bus_add()
2076 	acpi_video_bus_unregister_backlight(video);  in acpi_video_bus_add()
2078 	acpi_video_bus_put_devices(video);  in acpi_video_bus_add()
2079 	kfree(video->attached_array);  in acpi_video_bus_add()
2081 	kfree(video);  in acpi_video_bus_add()
2089 	struct acpi_video_bus *video = NULL;  in acpi_video_bus_remove()  local
2095 	video = acpi_driver_data(device);  in acpi_video_bus_remove()
2101 	list_del(&video->entry);  in acpi_video_bus_remove()
2104 	acpi_video_bus_remove_notify_handler(video);  in acpi_video_bus_remove()
2105 	acpi_video_bus_unregister_backlight(video);  in acpi_video_bus_remove()
2106 	acpi_video_bus_put_devices(video);  in acpi_video_bus_remove()
2108 	kfree(video->attached_array);  in acpi_video_bus_remove()
2109 	kfree(video);  in acpi_video_bus_remove()
2188 	struct acpi_video_bus *video;  in acpi_video_register_backlight()  local
2191 	list_for_each_entry(video, &video_bus_head, entry)  in acpi_video_register_backlight()
2192 		acpi_video_bus_register_backlight(video);  in acpi_video_register_backlight()
2206  * the video opregion code to be run first in order to initialise
2207  * state before any ACPI video calls are made. To handle this we defer
2208  * registration of the video class until the opregion code has run.