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
104 	.name = "video",
115 	u8 multihead:1;		/* can switch video heads */
116 	u8 rom:1;		/* can retrieve a video rom */
127 	u8 _VPO:1;		/* Video POST Options */
204 	struct acpi_video_bus *video;  member
212 static void acpi_video_device_rebind(struct acpi_video_bus *video);
213 static void acpi_video_device_bind(struct acpi_video_bus *video,
215 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
261 	struct acpi_video_device *video = acpi_driver_data(device);  in video_get_max_state()  local
263 	*state = video->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1;  in video_get_max_state()
271 	struct acpi_video_device *video = acpi_driver_data(device);  in video_get_cur_state()  local
275 	if (acpi_video_device_lcd_get_level_current(video, &level, false))  in video_get_cur_state()
277 	for (offset = ACPI_VIDEO_FIRST_LEVEL; offset < video->brightness->count;  in video_get_cur_state()
279 		if (level == video->brightness->levels[offset]) {  in video_get_cur_state()
280 			*state = video->brightness->count - offset - 1;  in video_get_cur_state()
291 	struct acpi_video_device *video = acpi_driver_data(device);  in video_set_cur_state()  local
294 	if (state >= video->brightness->count - ACPI_VIDEO_FIRST_LEVEL)  in video_set_cur_state()
297 	state = video->brightness->count - state;  in video_set_cur_state()
298 	level = video->brightness->levels[state - 1];  in video_set_cur_state()
299 	return acpi_video_device_lcd_set_level(video, level);  in video_set_cur_state()
310  *                             Video Management
465 	 * Some machines have a broken acpi-video interface for brightness
512 	 * Some machines have multiple video output devices, but only the one
514 	 * register backlight interface for other video output devices.
529 	 * events, in this case acpi-video is considered the canonical source
640 			 * ACPI video backlight still works w/ buggy _BQC.  in acpi_video_device_lcd_get_level_current()
696  *	video		: video bus device pointer
720 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)  in acpi_video_bus_DOS()  argument
724 	if (!video->cap._DOS)  in acpi_video_bus_DOS()
729 	video->dos_setting = (lcd_flag << 2) | bios_flag;  in acpi_video_bus_DOS()
730 	status = acpi_execute_simple_method(video->device->handle, "_DOS",  in acpi_video_bus_DOS()
937  *	device	: video output device (LCD, CRT, ..)
1011  *	device	: video output device (LCD, CRT, ..)
1042  *	device	: video output device (VGA)
1047  *  Find out all required AML methods defined under the video bus device.
1050 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)  in acpi_video_bus_find_cap()  argument
1052 	if (acpi_has_method(video->device->handle, "_DOS"))  in acpi_video_bus_find_cap()
1053 		video->cap._DOS = 1;  in acpi_video_bus_find_cap()
1054 	if (acpi_has_method(video->device->handle, "_DOD"))  in acpi_video_bus_find_cap()
1055 		video->cap._DOD = 1;  in acpi_video_bus_find_cap()
1056 	if (acpi_has_method(video->device->handle, "_ROM"))  in acpi_video_bus_find_cap()
1057 		video->cap._ROM = 1;  in acpi_video_bus_find_cap()
1058 	if (acpi_has_method(video->device->handle, "_GPD"))  in acpi_video_bus_find_cap()
1059 		video->cap._GPD = 1;  in acpi_video_bus_find_cap()
1060 	if (acpi_has_method(video->device->handle, "_SPD"))  in acpi_video_bus_find_cap()
1061 		video->cap._SPD = 1;  in acpi_video_bus_find_cap()
1062 	if (acpi_has_method(video->device->handle, "_VPO"))  in acpi_video_bus_find_cap()
1063 		video->cap._VPO = 1;  in acpi_video_bus_find_cap()
1067  * Check whether the video bus device has required AML method to
1071 static int acpi_video_bus_check(struct acpi_video_bus *video)  in acpi_video_bus_check()  argument
1076 	if (!video)  in acpi_video_bus_check()
1079 	dev = acpi_get_pci_dev(video->device->handle);  in acpi_video_bus_check()
1089 	/* Does this device support video switching? */  in acpi_video_bus_check()
1090 	if (video->cap._DOS || video->cap._DOD) {  in acpi_video_bus_check()
1091 		if (!video->cap._DOS) {  in acpi_video_bus_check()
1093 				acpi_device_bid(video->device));  in acpi_video_bus_check()
1095 		video->flags.multihead = 1;  in acpi_video_bus_check()
1099 	/* Does this device support retrieving a video ROM? */  in acpi_video_bus_check()
1100 	if (video->cap._ROM) {  in acpi_video_bus_check()
1101 		video->flags.rom = 1;  in acpi_video_bus_check()
1105 	/* Does this device support configuring which video device to POST? */  in acpi_video_bus_check()
1106 	if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {  in acpi_video_bus_check()
1107 		video->flags.post = 1;  in acpi_video_bus_check()
1122 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)  in acpi_video_get_device_attr()  argument
1127 	for (i = 0; i < video->attached_count; i++) {  in acpi_video_get_device_attr()
1128 		ids = &video->attached_array[i];  in acpi_video_get_device_attr()
1137 acpi_video_get_device_type(struct acpi_video_bus *video,  in acpi_video_get_device_type()  argument
1143 	for (i = 0; i < video->attached_count; i++) {  in acpi_video_get_device_type()
1144 		ids = &video->attached_array[i];  in acpi_video_get_device_type()
1154 			      struct acpi_video_bus *video)  in acpi_video_bus_get_one_device()  argument
1176 	data->video = video;  in acpi_video_bus_get_one_device()
1181 	attribute = acpi_video_get_device_attr(video, device_id);  in acpi_video_bus_get_one_device()
1205 		device_type = acpi_video_get_device_type(video, device_id);  in acpi_video_bus_get_one_device()
1222 	acpi_video_device_bind(video, data);  in acpi_video_bus_get_one_device()
1225 	mutex_lock(&video->device_list_lock);  in acpi_video_bus_get_one_device()
1226 	list_add_tail(&data->entry, &video->video_device_list);  in acpi_video_bus_get_one_device()
1227 	mutex_unlock(&video->device_list_lock);  in acpi_video_bus_get_one_device()
1234  *	video	: video bus device
1239  *  Enumerate the video device list of the video bus,
1240  *  bind the ids with the corresponding video devices
1241  *  under the video bus.
1244 static void acpi_video_device_rebind(struct acpi_video_bus *video)  in acpi_video_device_rebind()  argument
1248 	mutex_lock(&video->device_list_lock);  in acpi_video_device_rebind()
1250 	list_for_each_entry(dev, &video->video_device_list, entry)  in acpi_video_device_rebind()
1251 		acpi_video_device_bind(video, dev);  in acpi_video_device_rebind()
1253 	mutex_unlock(&video->device_list_lock);  in acpi_video_device_rebind()
1258  *	video	: video bus device
1259  *	device	: video output device under the video
1265  *  Bind the ids with the corresponding video devices
1266  *  under the video bus.
1270 acpi_video_device_bind(struct acpi_video_bus *video,  in acpi_video_device_bind()  argument
1276 	for (i = 0; i < video->attached_count; i++) {  in acpi_video_device_bind()
1277 		ids = &video->attached_array[i];  in acpi_video_device_bind()
1280 			acpi_handle_debug(video->device->handle, "%s: %d\n",  in acpi_video_device_bind()
1288 	struct acpi_video_bus *video = device->video;  in acpi_video_device_in_dod()  local
1296 	if (!video->attached_count || video->child_count > 8)  in acpi_video_device_in_dod()
1299 	for (i = 0; i < video->attached_count; i++) {  in acpi_video_device_in_dod()
1300 		if ((video->attached_array[i].value.int_val & 0xfff) ==  in acpi_video_device_in_dod()
1310  *	video	: video bus device
1319 static int acpi_video_device_enumerate(struct acpi_video_bus *video)  in acpi_video_device_enumerate()  argument
1329 	if (!video->cap._DOD)  in acpi_video_device_enumerate()
1332 	status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);  in acpi_video_device_enumerate()
1334 		acpi_handle_info(video->device->handle,  in acpi_video_device_enumerate()
1342 		acpi_handle_info(video->device->handle, "Invalid _DOD data\n");  in acpi_video_device_enumerate()
1347 	acpi_handle_debug(video->device->handle, "Found %d video heads in _DOD\n",  in acpi_video_device_enumerate()
1363 			acpi_handle_info(video->device->handle,  in acpi_video_device_enumerate()
1371 		acpi_handle_debug(video->device->handle,  in acpi_video_device_enumerate()
1378 	kfree(video->attached_array);  in acpi_video_device_enumerate()
1380 	video->attached_array = active_list;  in acpi_video_device_enumerate()
1381 	video->attached_count = count;  in acpi_video_device_enumerate()
1472 	struct acpi_video_bus *video;  in acpi_video_get_edid()  local
1481 	video = acpi_driver_data(device);  in acpi_video_get_edid()
1483 	for (i = 0; i < video->attached_count; i++) {  in acpi_video_get_edid()
1484 		video_device = video->attached_array[i].bind_info;  in acpi_video_get_edid()
1538 acpi_video_bus_get_devices(struct acpi_video_bus *video,  in acpi_video_bus_get_devices()  argument
1545 	 * There are systems where video module known to work fine regardless  in acpi_video_bus_get_devices()
1549 	acpi_video_device_enumerate(video);  in acpi_video_bus_get_devices()
1553 		status = acpi_video_bus_get_one_device(dev, video);  in acpi_video_bus_get_devices()
1558 		video->child_count++;  in acpi_video_bus_get_devices()
1569 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)  in acpi_video_bus_start_devices()  argument
1571 	return acpi_video_bus_DOS(video, 0,  in acpi_video_bus_start_devices()
1575 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)  in acpi_video_bus_stop_devices()  argument
1577 	return acpi_video_bus_DOS(video, 0,  in acpi_video_bus_stop_devices()
1583 	struct acpi_video_bus *video = acpi_driver_data(device);  in acpi_video_bus_notify()  local
1587 	if (!video || !video->input)  in acpi_video_bus_notify()
1590 	input = video->input;  in acpi_video_bus_notify()
1598 	case ACPI_VIDEO_NOTIFY_PROBE:	/* User plugged in or removed a video  in acpi_video_bus_notify()
1600 		acpi_video_device_enumerate(video);  in acpi_video_bus_notify()
1601 		acpi_video_device_rebind(video);  in acpi_video_bus_notify()
1655 	bus = video_device->video;  in acpi_video_device_notify()
1705 	struct acpi_video_bus *video;  in acpi_video_resume()  local
1716 	video = container_of(nb, struct acpi_video_bus, pm_nb);  in acpi_video_resume()
1718 	dev_info(&video->device->dev, "Restoring backlight state\n");  in acpi_video_resume()
1720 	for (i = 0; i < video->attached_count; i++) {  in acpi_video_resume()
1721 		video_device = video->attached_array[i].bind_info;  in acpi_video_resume()
1809 		 * register video output if cooling device registration failed?  in acpi_video_dev_register_backlight()
1830 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)  in acpi_video_run_bcl_for_osi()  argument
1835 	mutex_lock(&video->device_list_lock);  in acpi_video_run_bcl_for_osi()
1836 	list_for_each_entry(dev, &video->video_device_list, entry) {  in acpi_video_run_bcl_for_osi()
1840 	mutex_unlock(&video->device_list_lock);  in acpi_video_run_bcl_for_osi()
1846 	 * Do not create backlight device for video output  in acpi_video_should_register_backlight()
1859 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)  in acpi_video_bus_register_backlight()  argument
1863 	if (video->backlight_registered)  in acpi_video_bus_register_backlight()
1866 	acpi_video_run_bcl_for_osi(video);  in acpi_video_bus_register_backlight()
1871 	mutex_lock(&video->device_list_lock);  in acpi_video_bus_register_backlight()
1872 	list_for_each_entry(dev, &video->video_device_list, entry) {  in acpi_video_bus_register_backlight()
1876 	mutex_unlock(&video->device_list_lock);  in acpi_video_bus_register_backlight()
1878 	video->backlight_registered = true;  in acpi_video_bus_register_backlight()
1880 	video->pm_nb.notifier_call = acpi_video_resume;  in acpi_video_bus_register_backlight()
1881 	video->pm_nb.priority = 0;  in acpi_video_bus_register_backlight()
1882 	return register_pm_notifier(&video->pm_nb);  in acpi_video_bus_register_backlight()
1904 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)  in acpi_video_bus_unregister_backlight()  argument
1909 	if (!video->backlight_registered)  in acpi_video_bus_unregister_backlight()
1912 	error = unregister_pm_notifier(&video->pm_nb);  in acpi_video_bus_unregister_backlight()
1914 	mutex_lock(&video->device_list_lock);  in acpi_video_bus_unregister_backlight()
1915 	list_for_each_entry(dev, &video->video_device_list, entry)  in acpi_video_bus_unregister_backlight()
1917 	mutex_unlock(&video->device_list_lock);  in acpi_video_bus_unregister_backlight()
1919 	video->backlight_registered = false;  in acpi_video_bus_unregister_backlight()
1937 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)  in acpi_video_bus_add_notify_handler()  argument
1943 	video->input = input = input_allocate_device();  in acpi_video_bus_add_notify_handler()
1949 	error = acpi_video_bus_start_devices(video);  in acpi_video_bus_add_notify_handler()
1953 	snprintf(video->phys, sizeof(video->phys),  in acpi_video_bus_add_notify_handler()
1954 			"%s/video/input0", acpi_device_hid(video->device));  in acpi_video_bus_add_notify_handler()
1956 	input->name = acpi_device_name(video->device);  in acpi_video_bus_add_notify_handler()
1957 	input->phys = video->phys;  in acpi_video_bus_add_notify_handler()
1960 	input->dev.parent = &video->device->dev;  in acpi_video_bus_add_notify_handler()
1975 	mutex_lock(&video->device_list_lock);  in acpi_video_bus_add_notify_handler()
1976 	list_for_each_entry(dev, &video->video_device_list, entry)  in acpi_video_bus_add_notify_handler()
1978 	mutex_unlock(&video->device_list_lock);  in acpi_video_bus_add_notify_handler()
1983 	acpi_video_bus_stop_devices(video);  in acpi_video_bus_add_notify_handler()
1986 	video->input = NULL;  in acpi_video_bus_add_notify_handler()
2000 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)  in acpi_video_bus_remove_notify_handler()  argument
2004 	mutex_lock(&video->device_list_lock);  in acpi_video_bus_remove_notify_handler()
2005 	list_for_each_entry(dev, &video->video_device_list, entry)  in acpi_video_bus_remove_notify_handler()
2007 	mutex_unlock(&video->device_list_lock);  in acpi_video_bus_remove_notify_handler()
2009 	acpi_video_bus_stop_devices(video);  in acpi_video_bus_remove_notify_handler()
2010 	input_unregister_device(video->input);  in acpi_video_bus_remove_notify_handler()
2011 	video->input = NULL;  in acpi_video_bus_remove_notify_handler()
2014 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)  in acpi_video_bus_put_devices()  argument
2018 	mutex_lock(&video->device_list_lock);  in acpi_video_bus_put_devices()
2019 	list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {  in acpi_video_bus_put_devices()
2023 	mutex_unlock(&video->device_list_lock);  in acpi_video_bus_put_devices()
2032 	struct acpi_video_bus *video;  in acpi_video_bus_add()  local
2042 			"Duplicate ACPI video bus devices for the"  in acpi_video_bus_add()
2044 			"parameter \"video.allow_duplicates=1\""  in acpi_video_bus_add()
2050 	video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);  in acpi_video_bus_add()
2051 	if (!video)  in acpi_video_bus_add()
2067 	video->device = device;  in acpi_video_bus_add()
2070 	device->driver_data = video;  in acpi_video_bus_add()
2072 	acpi_video_bus_find_cap(video);  in acpi_video_bus_add()
2073 	error = acpi_video_bus_check(video);  in acpi_video_bus_add()
2077 	mutex_init(&video->device_list_lock);  in acpi_video_bus_add()
2078 	INIT_LIST_HEAD(&video->video_device_list);  in acpi_video_bus_add()
2080 	error = acpi_video_bus_get_devices(video, device);  in acpi_video_bus_add()
2086 	       video->flags.multihead ? "yes" : "no",  in acpi_video_bus_add()
2087 	       video->flags.rom ? "yes" : "no",  in acpi_video_bus_add()
2088 	       video->flags.post ? "yes" : "no");  in acpi_video_bus_add()
2090 	list_add_tail(&video->entry, &video_bus_head);  in acpi_video_bus_add()
2093 	acpi_video_bus_register_backlight(video);  in acpi_video_bus_add()
2094 	acpi_video_bus_add_notify_handler(video);  in acpi_video_bus_add()
2099 	acpi_video_bus_put_devices(video);  in acpi_video_bus_add()
2100 	kfree(video->attached_array);  in acpi_video_bus_add()
2102 	kfree(video);  in acpi_video_bus_add()
2110 	struct acpi_video_bus *video = NULL;  in acpi_video_bus_remove()  local
2116 	video = acpi_driver_data(device);  in acpi_video_bus_remove()
2118 	acpi_video_bus_remove_notify_handler(video);  in acpi_video_bus_remove()
2119 	acpi_video_bus_unregister_backlight(video);  in acpi_video_bus_remove()
2120 	acpi_video_bus_put_devices(video);  in acpi_video_bus_remove()
2123 	list_del(&video->entry);  in acpi_video_bus_remove()
2126 	kfree(video->attached_array);  in acpi_video_bus_remove()
2127 	kfree(video);  in acpi_video_bus_remove()
2261 	struct acpi_video_bus *video;  in acpi_video_unregister_backlight()  local
2266 		list_for_each_entry(video, &video_bus_head, entry)  in acpi_video_unregister_backlight()
2267 			acpi_video_bus_unregister_backlight(video);  in acpi_video_unregister_backlight()
2288  * the video opregion code to be run first in order to initialise
2289  * state before any ACPI video calls are made. To handle this we defer
2290  * registration of the video class until the opregion code has run.