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);
257 	struct acpi_video_device *video = acpi_driver_data(device);  in video_get_max_state()  local
259 	*state = video->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1;  in video_get_max_state()
267 	struct acpi_video_device *video = acpi_driver_data(device);  in video_get_cur_state()  local
271 	if (acpi_video_device_lcd_get_level_current(video, &level, false))  in video_get_cur_state()
273 	for (offset = ACPI_VIDEO_FIRST_LEVEL; offset < video->brightness->count;  in video_get_cur_state()
275 		if (level == video->brightness->levels[offset]) {  in video_get_cur_state()
276 			*state = video->brightness->count - offset - 1;  in video_get_cur_state()
287 	struct acpi_video_device *video = acpi_driver_data(device);  in video_set_cur_state()  local
290 	if (state >= video->brightness->count - ACPI_VIDEO_FIRST_LEVEL)  in video_set_cur_state()
293 	state = video->brightness->count - state;  in video_set_cur_state()
294 	level = video->brightness->levels[state - 1];  in video_set_cur_state()
295 	return acpi_video_device_lcd_set_level(video, level);  in video_set_cur_state()
306  *                             Video Management
466 	 * Some machines have multiple video output devices, but only the one
468 	 * register backlight interface for other video output devices.
483 	 * events, in this case acpi-video is considered the canonical source
594 			 * ACPI video backlight still works w/ buggy _BQC.  in acpi_video_device_lcd_get_level_current()
650  *	video		: video bus device pointer
674 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)  in acpi_video_bus_DOS()  argument
678 	if (!video->cap._DOS)  in acpi_video_bus_DOS()
683 	video->dos_setting = (lcd_flag << 2) | bios_flag;  in acpi_video_bus_DOS()
684 	status = acpi_execute_simple_method(video->device->handle, "_DOS",  in acpi_video_bus_DOS()
891  *	device	: video output device (LCD, CRT, ..)
965  *	device	: video output device (LCD, CRT, ..)
996  *	device	: video output device (VGA)
1001  *  Find out all required AML methods defined under the video bus device.
1004 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)  in acpi_video_bus_find_cap()  argument
1006 	if (acpi_has_method(video->device->handle, "_DOS"))  in acpi_video_bus_find_cap()
1007 		video->cap._DOS = 1;  in acpi_video_bus_find_cap()
1008 	if (acpi_has_method(video->device->handle, "_DOD"))  in acpi_video_bus_find_cap()
1009 		video->cap._DOD = 1;  in acpi_video_bus_find_cap()
1010 	if (acpi_has_method(video->device->handle, "_ROM"))  in acpi_video_bus_find_cap()
1011 		video->cap._ROM = 1;  in acpi_video_bus_find_cap()
1012 	if (acpi_has_method(video->device->handle, "_GPD"))  in acpi_video_bus_find_cap()
1013 		video->cap._GPD = 1;  in acpi_video_bus_find_cap()
1014 	if (acpi_has_method(video->device->handle, "_SPD"))  in acpi_video_bus_find_cap()
1015 		video->cap._SPD = 1;  in acpi_video_bus_find_cap()
1016 	if (acpi_has_method(video->device->handle, "_VPO"))  in acpi_video_bus_find_cap()
1017 		video->cap._VPO = 1;  in acpi_video_bus_find_cap()
1021  * Check whether the video bus device has required AML method to
1025 static int acpi_video_bus_check(struct acpi_video_bus *video)  in acpi_video_bus_check()  argument
1030 	if (!video)  in acpi_video_bus_check()
1033 	dev = acpi_get_pci_dev(video->device->handle);  in acpi_video_bus_check()
1043 	/* Does this device support video switching? */  in acpi_video_bus_check()
1044 	if (video->cap._DOS || video->cap._DOD) {  in acpi_video_bus_check()
1045 		if (!video->cap._DOS) {  in acpi_video_bus_check()
1047 				acpi_device_bid(video->device));  in acpi_video_bus_check()
1049 		video->flags.multihead = 1;  in acpi_video_bus_check()
1053 	/* Does this device support retrieving a video ROM? */  in acpi_video_bus_check()
1054 	if (video->cap._ROM) {  in acpi_video_bus_check()
1055 		video->flags.rom = 1;  in acpi_video_bus_check()
1059 	/* Does this device support configuring which video device to POST? */  in acpi_video_bus_check()
1060 	if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {  in acpi_video_bus_check()
1061 		video->flags.post = 1;  in acpi_video_bus_check()
1076 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)  in acpi_video_get_device_attr()  argument
1081 	for (i = 0; i < video->attached_count; i++) {  in acpi_video_get_device_attr()
1082 		ids = &video->attached_array[i];  in acpi_video_get_device_attr()
1091 acpi_video_get_device_type(struct acpi_video_bus *video,  in acpi_video_get_device_type()  argument
1097 	for (i = 0; i < video->attached_count; i++) {  in acpi_video_get_device_type()
1098 		ids = &video->attached_array[i];  in acpi_video_get_device_type()
1108 	struct acpi_video_bus *video = arg;  in acpi_video_bus_get_one_device()  local
1131 	data->video = video;  in acpi_video_bus_get_one_device()
1136 	attribute = acpi_video_get_device_attr(video, device_id);  in acpi_video_bus_get_one_device()
1160 		device_type = acpi_video_get_device_type(video, device_id);  in acpi_video_bus_get_one_device()
1177 	acpi_video_device_bind(video, data);  in acpi_video_bus_get_one_device()
1183 	mutex_lock(&video->device_list_lock);  in acpi_video_bus_get_one_device()
1184 	list_add_tail(&data->entry, &video->video_device_list);  in acpi_video_bus_get_one_device()
1185 	mutex_unlock(&video->device_list_lock);  in acpi_video_bus_get_one_device()
1188 	video->child_count++;  in acpi_video_bus_get_one_device()
1194  *	video	: video bus device
1199  *  Enumerate the video device list of the video bus,
1200  *  bind the ids with the corresponding video devices
1201  *  under the video bus.
1204 static void acpi_video_device_rebind(struct acpi_video_bus *video)  in acpi_video_device_rebind()  argument
1208 	mutex_lock(&video->device_list_lock);  in acpi_video_device_rebind()
1210 	list_for_each_entry(dev, &video->video_device_list, entry)  in acpi_video_device_rebind()
1211 		acpi_video_device_bind(video, dev);  in acpi_video_device_rebind()
1213 	mutex_unlock(&video->device_list_lock);  in acpi_video_device_rebind()
1218  *	video	: video bus device
1219  *	device	: video output device under the video
1225  *  Bind the ids with the corresponding video devices
1226  *  under the video bus.
1230 acpi_video_device_bind(struct acpi_video_bus *video,  in acpi_video_device_bind()  argument
1236 	for (i = 0; i < video->attached_count; i++) {  in acpi_video_device_bind()
1237 		ids = &video->attached_array[i];  in acpi_video_device_bind()
1240 			acpi_handle_debug(video->device->handle, "%s: %d\n",  in acpi_video_device_bind()
1248 	struct acpi_video_bus *video = device->video;  in acpi_video_device_in_dod()  local
1256 	if (!video->attached_count || video->child_count > 8)  in acpi_video_device_in_dod()
1259 	for (i = 0; i < video->attached_count; i++) {  in acpi_video_device_in_dod()
1260 		if ((video->attached_array[i].value.int_val & 0xfff) ==  in acpi_video_device_in_dod()
1270  *	video	: video bus device
1279 static int acpi_video_device_enumerate(struct acpi_video_bus *video)  in acpi_video_device_enumerate()  argument
1289 	if (!video->cap._DOD)  in acpi_video_device_enumerate()
1292 	status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);  in acpi_video_device_enumerate()
1294 		acpi_handle_info(video->device->handle,  in acpi_video_device_enumerate()
1302 		acpi_handle_info(video->device->handle, "Invalid _DOD data\n");  in acpi_video_device_enumerate()
1307 	acpi_handle_debug(video->device->handle, "Found %d video heads in _DOD\n",  in acpi_video_device_enumerate()
1323 			acpi_handle_info(video->device->handle,  in acpi_video_device_enumerate()
1331 		acpi_handle_debug(video->device->handle,  in acpi_video_device_enumerate()
1338 	kfree(video->attached_array);  in acpi_video_device_enumerate()
1340 	video->attached_array = active_list;  in acpi_video_device_enumerate()
1341 	video->attached_count = count;  in acpi_video_device_enumerate()
1432 	struct acpi_video_bus *video;  in acpi_video_get_edid()  local
1441 	video = acpi_driver_data(device);  in acpi_video_get_edid()
1443 	for (i = 0; i < video->attached_count; i++) {  in acpi_video_get_edid()
1444 		video_device = video->attached_array[i].bind_info;  in acpi_video_get_edid()
1498 acpi_video_bus_get_devices(struct acpi_video_bus *video,  in acpi_video_bus_get_devices()  argument
1502 	 * There are systems where video module known to work fine regardless  in acpi_video_bus_get_devices()
1506 	acpi_video_device_enumerate(video);  in acpi_video_bus_get_devices()
1508 	return acpi_dev_for_each_child(device, acpi_video_bus_get_one_device, video);  in acpi_video_bus_get_devices()
1517 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)  in acpi_video_bus_start_devices()  argument
1519 	return acpi_video_bus_DOS(video, 0,  in acpi_video_bus_start_devices()
1523 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)  in acpi_video_bus_stop_devices()  argument
1525 	return acpi_video_bus_DOS(video, 0,  in acpi_video_bus_stop_devices()
1532 	struct acpi_video_bus *video = acpi_driver_data(device);  in acpi_video_bus_notify()  local
1536 	if (!video || !video->input)  in acpi_video_bus_notify()
1539 	input = video->input;  in acpi_video_bus_notify()
1547 	case ACPI_VIDEO_NOTIFY_PROBE:	/* User plugged in or removed a video  in acpi_video_bus_notify()
1549 		acpi_video_device_enumerate(video);  in acpi_video_bus_notify()
1550 		acpi_video_device_rebind(video);  in acpi_video_bus_notify()
1604 	bus = video_device->video;  in acpi_video_device_notify()
1657 	struct acpi_video_bus *video;  in acpi_video_resume()  local
1665 		video = container_of(nb, struct acpi_video_bus, pm_nb);  in acpi_video_resume()
1667 		dev_info(&video->device->dev, "Restoring backlight state\n");  in acpi_video_resume()
1669 		for (i = 0; i < video->attached_count; i++) {  in acpi_video_resume()
1670 			video_device = video->attached_array[i].bind_info;  in acpi_video_resume()
1756 		 * register video output if cooling device registration failed?  in acpi_video_dev_register_backlight()
1777 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)  in acpi_video_run_bcl_for_osi()  argument
1782 	mutex_lock(&video->device_list_lock);  in acpi_video_run_bcl_for_osi()
1783 	list_for_each_entry(dev, &video->video_device_list, entry) {  in acpi_video_run_bcl_for_osi()
1787 	mutex_unlock(&video->device_list_lock);  in acpi_video_run_bcl_for_osi()
1793 	 * Do not create backlight device for video output  in acpi_video_should_register_backlight()
1806 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)  in acpi_video_bus_register_backlight()  argument
1810 	if (video->backlight_registered)  in acpi_video_bus_register_backlight()
1816 	mutex_lock(&video->device_list_lock);  in acpi_video_bus_register_backlight()
1817 	list_for_each_entry(dev, &video->video_device_list, entry) {  in acpi_video_bus_register_backlight()
1821 	mutex_unlock(&video->device_list_lock);  in acpi_video_bus_register_backlight()
1823 	video->backlight_registered = true;  in acpi_video_bus_register_backlight()
1825 	video->pm_nb.notifier_call = acpi_video_resume;  in acpi_video_bus_register_backlight()
1826 	video->pm_nb.priority = 0;  in acpi_video_bus_register_backlight()
1827 	return register_pm_notifier(&video->pm_nb);  in acpi_video_bus_register_backlight()
1849 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)  in acpi_video_bus_unregister_backlight()  argument
1854 	if (!video->backlight_registered)  in acpi_video_bus_unregister_backlight()
1857 	error = unregister_pm_notifier(&video->pm_nb);  in acpi_video_bus_unregister_backlight()
1859 	mutex_lock(&video->device_list_lock);  in acpi_video_bus_unregister_backlight()
1860 	list_for_each_entry(dev, &video->video_device_list, entry)  in acpi_video_bus_unregister_backlight()
1862 	mutex_unlock(&video->device_list_lock);  in acpi_video_bus_unregister_backlight()
1864 	video->backlight_registered = false;  in acpi_video_bus_unregister_backlight()
1882 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)  in acpi_video_bus_add_notify_handler()  argument
1888 	video->input = input = input_allocate_device();  in acpi_video_bus_add_notify_handler()
1894 	error = acpi_video_bus_start_devices(video);  in acpi_video_bus_add_notify_handler()
1898 	snprintf(video->phys, sizeof(video->phys),  in acpi_video_bus_add_notify_handler()
1899 			"%s/video/input0", acpi_device_hid(video->device));  in acpi_video_bus_add_notify_handler()
1901 	input->name = acpi_device_name(video->device);  in acpi_video_bus_add_notify_handler()
1902 	input->phys = video->phys;  in acpi_video_bus_add_notify_handler()
1905 	input->dev.parent = &video->device->dev;  in acpi_video_bus_add_notify_handler()
1920 	mutex_lock(&video->device_list_lock);  in acpi_video_bus_add_notify_handler()
1921 	list_for_each_entry(dev, &video->video_device_list, entry)  in acpi_video_bus_add_notify_handler()
1923 	mutex_unlock(&video->device_list_lock);  in acpi_video_bus_add_notify_handler()
1928 	acpi_video_bus_stop_devices(video);  in acpi_video_bus_add_notify_handler()
1931 	video->input = NULL;  in acpi_video_bus_add_notify_handler()
1945 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)  in acpi_video_bus_remove_notify_handler()  argument
1949 	mutex_lock(&video->device_list_lock);  in acpi_video_bus_remove_notify_handler()
1950 	list_for_each_entry(dev, &video->video_device_list, entry)  in acpi_video_bus_remove_notify_handler()
1952 	mutex_unlock(&video->device_list_lock);  in acpi_video_bus_remove_notify_handler()
1954 	acpi_video_bus_stop_devices(video);  in acpi_video_bus_remove_notify_handler()
1955 	input_unregister_device(video->input);  in acpi_video_bus_remove_notify_handler()
1956 	video->input = NULL;  in acpi_video_bus_remove_notify_handler()
1959 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)  in acpi_video_bus_put_devices()  argument
1963 	mutex_lock(&video->device_list_lock);  in acpi_video_bus_put_devices()
1964 	list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {  in acpi_video_bus_put_devices()
1968 	mutex_unlock(&video->device_list_lock);  in acpi_video_bus_put_devices()
1977 	struct acpi_video_bus *video;  in acpi_video_bus_add()  local
1988 			"Duplicate ACPI video bus devices for the"  in acpi_video_bus_add()
1990 			"parameter \"video.allow_duplicates=1\""  in acpi_video_bus_add()
1996 	video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);  in acpi_video_bus_add()
1997 	if (!video)  in acpi_video_bus_add()
2013 	video->device = device;  in acpi_video_bus_add()
2016 	device->driver_data = video;  in acpi_video_bus_add()
2018 	acpi_video_bus_find_cap(video);  in acpi_video_bus_add()
2019 	error = acpi_video_bus_check(video);  in acpi_video_bus_add()
2023 	mutex_init(&video->device_list_lock);  in acpi_video_bus_add()
2024 	INIT_LIST_HEAD(&video->video_device_list);  in acpi_video_bus_add()
2026 	error = acpi_video_bus_get_devices(video, device);  in acpi_video_bus_add()
2031 	 * HP ZBook Fury 16 G10 requires ACPI video's child devices have _PS0  in acpi_video_bus_add()
2038 	       video->flags.multihead ? "yes" : "no",  in acpi_video_bus_add()
2039 	       video->flags.rom ? "yes" : "no",  in acpi_video_bus_add()
2040 	       video->flags.post ? "yes" : "no");  in acpi_video_bus_add()
2042 	list_add_tail(&video->entry, &video_bus_head);  in acpi_video_bus_add()
2047 	 * show up later and this may change the result from video to native.  in acpi_video_bus_add()
2055 	acpi_video_run_bcl_for_osi(video);  in acpi_video_bus_add()
2058 		acpi_video_bus_register_backlight(video);  in acpi_video_bus_add()
2060 	error = acpi_video_bus_add_notify_handler(video);  in acpi_video_bus_add()
2072 	acpi_video_bus_remove_notify_handler(video);  in acpi_video_bus_add()
2075 	list_del(&video->entry);  in acpi_video_bus_add()
2077 	acpi_video_bus_unregister_backlight(video);  in acpi_video_bus_add()
2079 	acpi_video_bus_put_devices(video);  in acpi_video_bus_add()
2080 	kfree(video->attached_array);  in acpi_video_bus_add()
2082 	kfree(video);  in acpi_video_bus_add()
2090 	struct acpi_video_bus *video = NULL;  in acpi_video_bus_remove()  local
2096 	video = acpi_driver_data(device);  in acpi_video_bus_remove()
2102 	list_del(&video->entry);  in acpi_video_bus_remove()
2105 	acpi_video_bus_remove_notify_handler(video);  in acpi_video_bus_remove()
2106 	acpi_video_bus_unregister_backlight(video);  in acpi_video_bus_remove()
2107 	acpi_video_bus_put_devices(video);  in acpi_video_bus_remove()
2109 	kfree(video->attached_array);  in acpi_video_bus_remove()
2110 	kfree(video);  in acpi_video_bus_remove()
2243 	struct acpi_video_bus *video;  in acpi_video_register_backlight()  local
2246 	list_for_each_entry(video, &video_bus_head, entry)  in acpi_video_register_backlight()
2247 		acpi_video_bus_register_backlight(video);  in acpi_video_register_backlight()
2261  * the video opregion code to be run first in order to initialise
2262  * state before any ACPI video calls are made. To handle this we defer
2263  * registration of the video class until the opregion code has run.