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
114 	.name = "video",
125 	u8 multihead:1;		/* can switch video heads */
126 	u8 rom:1;		/* can retrieve a video rom */
137 	u8 _VPO:1;		/* Video POST Options */
214 	struct acpi_video_bus *video;  member
222 static void acpi_video_device_rebind(struct acpi_video_bus *video);
223 static void acpi_video_device_bind(struct acpi_video_bus *video,
225 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
271 	struct acpi_video_device *video = acpi_driver_data(device);  in video_get_max_state()  local
273 	*state = video->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1;  in video_get_max_state()
281 	struct acpi_video_device *video = acpi_driver_data(device);  in video_get_cur_state()  local
285 	if (acpi_video_device_lcd_get_level_current(video, &level, false))  in video_get_cur_state()
287 	for (offset = ACPI_VIDEO_FIRST_LEVEL; offset < video->brightness->count;  in video_get_cur_state()
289 		if (level == video->brightness->levels[offset]) {  in video_get_cur_state()
290 			*state = video->brightness->count - offset - 1;  in video_get_cur_state()
301 	struct acpi_video_device *video = acpi_driver_data(device);  in video_set_cur_state()  local
304 	if (state >= video->brightness->count - ACPI_VIDEO_FIRST_LEVEL)  in video_set_cur_state()
307 	state = video->brightness->count - state;  in video_set_cur_state()
308 	level = video->brightness->levels[state - 1];  in video_set_cur_state()
309 	return acpi_video_device_lcd_set_level(video, level);  in video_set_cur_state()
320  *                             Video Management
480 	 * Some machines have multiple video output devices, but only the one
482 	 * register backlight interface for other video output devices.
497 	 * events, in this case acpi-video is considered the canonical source
608 			 * ACPI video backlight still works w/ buggy _BQC.  in acpi_video_device_lcd_get_level_current()
664  *	video		: video bus device pointer
688 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)  in acpi_video_bus_DOS()  argument
692 	if (!video->cap._DOS)  in acpi_video_bus_DOS()
697 	video->dos_setting = (lcd_flag << 2) | bios_flag;  in acpi_video_bus_DOS()
698 	status = acpi_execute_simple_method(video->device->handle, "_DOS",  in acpi_video_bus_DOS()
905  *	device	: video output device (LCD, CRT, ..)
979  *	device	: video output device (LCD, CRT, ..)
1010  *	device	: video output device (VGA)
1015  *  Find out all required AML methods defined under the video bus device.
1018 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)  in acpi_video_bus_find_cap()  argument
1020 	if (acpi_has_method(video->device->handle, "_DOS"))  in acpi_video_bus_find_cap()
1021 		video->cap._DOS = 1;  in acpi_video_bus_find_cap()
1022 	if (acpi_has_method(video->device->handle, "_DOD"))  in acpi_video_bus_find_cap()
1023 		video->cap._DOD = 1;  in acpi_video_bus_find_cap()
1024 	if (acpi_has_method(video->device->handle, "_ROM"))  in acpi_video_bus_find_cap()
1025 		video->cap._ROM = 1;  in acpi_video_bus_find_cap()
1026 	if (acpi_has_method(video->device->handle, "_GPD"))  in acpi_video_bus_find_cap()
1027 		video->cap._GPD = 1;  in acpi_video_bus_find_cap()
1028 	if (acpi_has_method(video->device->handle, "_SPD"))  in acpi_video_bus_find_cap()
1029 		video->cap._SPD = 1;  in acpi_video_bus_find_cap()
1030 	if (acpi_has_method(video->device->handle, "_VPO"))  in acpi_video_bus_find_cap()
1031 		video->cap._VPO = 1;  in acpi_video_bus_find_cap()
1035  * Check whether the video bus device has required AML method to
1039 static int acpi_video_bus_check(struct acpi_video_bus *video)  in acpi_video_bus_check()  argument
1044 	if (!video)  in acpi_video_bus_check()
1047 	dev = acpi_get_pci_dev(video->device->handle);  in acpi_video_bus_check()
1057 	/* Does this device support video switching? */  in acpi_video_bus_check()
1058 	if (video->cap._DOS || video->cap._DOD) {  in acpi_video_bus_check()
1059 		if (!video->cap._DOS) {  in acpi_video_bus_check()
1061 				acpi_device_bid(video->device));  in acpi_video_bus_check()
1063 		video->flags.multihead = 1;  in acpi_video_bus_check()
1067 	/* Does this device support retrieving a video ROM? */  in acpi_video_bus_check()
1068 	if (video->cap._ROM) {  in acpi_video_bus_check()
1069 		video->flags.rom = 1;  in acpi_video_bus_check()
1073 	/* Does this device support configuring which video device to POST? */  in acpi_video_bus_check()
1074 	if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {  in acpi_video_bus_check()
1075 		video->flags.post = 1;  in acpi_video_bus_check()
1090 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)  in acpi_video_get_device_attr()  argument
1095 	for (i = 0; i < video->attached_count; i++) {  in acpi_video_get_device_attr()
1096 		ids = &video->attached_array[i];  in acpi_video_get_device_attr()
1105 acpi_video_get_device_type(struct acpi_video_bus *video,  in acpi_video_get_device_type()  argument
1111 	for (i = 0; i < video->attached_count; i++) {  in acpi_video_get_device_type()
1112 		ids = &video->attached_array[i];  in acpi_video_get_device_type()
1122 	struct acpi_video_bus *video = arg;  in acpi_video_bus_get_one_device()  local
1145 	data->video = video;  in acpi_video_bus_get_one_device()
1150 	attribute = acpi_video_get_device_attr(video, device_id);  in acpi_video_bus_get_one_device()
1174 		device_type = acpi_video_get_device_type(video, device_id);  in acpi_video_bus_get_one_device()
1191 	acpi_video_device_bind(video, data);  in acpi_video_bus_get_one_device()
1197 	mutex_lock(&video->device_list_lock);  in acpi_video_bus_get_one_device()
1198 	list_add_tail(&data->entry, &video->video_device_list);  in acpi_video_bus_get_one_device()
1199 	mutex_unlock(&video->device_list_lock);  in acpi_video_bus_get_one_device()
1202 	video->child_count++;  in acpi_video_bus_get_one_device()
1208  *	video	: video bus device
1213  *  Enumerate the video device list of the video bus,
1214  *  bind the ids with the corresponding video devices
1215  *  under the video bus.
1218 static void acpi_video_device_rebind(struct acpi_video_bus *video)  in acpi_video_device_rebind()  argument
1222 	mutex_lock(&video->device_list_lock);  in acpi_video_device_rebind()
1224 	list_for_each_entry(dev, &video->video_device_list, entry)  in acpi_video_device_rebind()
1225 		acpi_video_device_bind(video, dev);  in acpi_video_device_rebind()
1227 	mutex_unlock(&video->device_list_lock);  in acpi_video_device_rebind()
1232  *	video	: video bus device
1233  *	device	: video output device under the video
1239  *  Bind the ids with the corresponding video devices
1240  *  under the video bus.
1244 acpi_video_device_bind(struct acpi_video_bus *video,  in acpi_video_device_bind()  argument
1250 	for (i = 0; i < video->attached_count; i++) {  in acpi_video_device_bind()
1251 		ids = &video->attached_array[i];  in acpi_video_device_bind()
1254 			acpi_handle_debug(video->device->handle, "%s: %d\n",  in acpi_video_device_bind()
1262 	struct acpi_video_bus *video = device->video;  in acpi_video_device_in_dod()  local
1270 	if (!video->attached_count || video->child_count > 8)  in acpi_video_device_in_dod()
1273 	for (i = 0; i < video->attached_count; i++) {  in acpi_video_device_in_dod()
1274 		if ((video->attached_array[i].value.int_val & 0xfff) ==  in acpi_video_device_in_dod()
1284  *	video	: video bus device
1293 static int acpi_video_device_enumerate(struct acpi_video_bus *video)  in acpi_video_device_enumerate()  argument
1303 	if (!video->cap._DOD)  in acpi_video_device_enumerate()
1306 	status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);  in acpi_video_device_enumerate()
1308 		acpi_handle_info(video->device->handle,  in acpi_video_device_enumerate()
1316 		acpi_handle_info(video->device->handle, "Invalid _DOD data\n");  in acpi_video_device_enumerate()
1321 	acpi_handle_debug(video->device->handle, "Found %d video heads in _DOD\n",  in acpi_video_device_enumerate()
1337 			acpi_handle_info(video->device->handle,  in acpi_video_device_enumerate()
1345 		acpi_handle_debug(video->device->handle,  in acpi_video_device_enumerate()
1352 	kfree(video->attached_array);  in acpi_video_device_enumerate()
1354 	video->attached_array = active_list;  in acpi_video_device_enumerate()
1355 	video->attached_count = count;  in acpi_video_device_enumerate()
1446 	struct acpi_video_bus *video;  in acpi_video_get_edid()  local
1455 	video = acpi_driver_data(device);  in acpi_video_get_edid()
1457 	for (i = 0; i < video->attached_count; i++) {  in acpi_video_get_edid()
1458 		video_device = video->attached_array[i].bind_info;  in acpi_video_get_edid()
1512 acpi_video_bus_get_devices(struct acpi_video_bus *video,  in acpi_video_bus_get_devices()  argument
1516 	 * There are systems where video module known to work fine regardless  in acpi_video_bus_get_devices()
1520 	acpi_video_device_enumerate(video);  in acpi_video_bus_get_devices()
1522 	return acpi_dev_for_each_child(device, acpi_video_bus_get_one_device, video);  in acpi_video_bus_get_devices()
1531 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)  in acpi_video_bus_start_devices()  argument
1533 	return acpi_video_bus_DOS(video, 0,  in acpi_video_bus_start_devices()
1537 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)  in acpi_video_bus_stop_devices()  argument
1539 	return acpi_video_bus_DOS(video, 0,  in acpi_video_bus_stop_devices()
1545 	struct acpi_video_bus *video = acpi_driver_data(device);  in acpi_video_bus_notify()  local
1549 	if (!video || !video->input)  in acpi_video_bus_notify()
1552 	input = video->input;  in acpi_video_bus_notify()
1560 	case ACPI_VIDEO_NOTIFY_PROBE:	/* User plugged in or removed a video  in acpi_video_bus_notify()
1562 		acpi_video_device_enumerate(video);  in acpi_video_bus_notify()
1563 		acpi_video_device_rebind(video);  in acpi_video_bus_notify()
1617 	bus = video_device->video;  in acpi_video_device_notify()
1670 	struct acpi_video_bus *video;  in acpi_video_resume()  local
1678 		video = container_of(nb, struct acpi_video_bus, pm_nb);  in acpi_video_resume()
1680 		dev_info(&video->device->dev, "Restoring backlight state\n");  in acpi_video_resume()
1682 		for (i = 0; i < video->attached_count; i++) {  in acpi_video_resume()
1683 			video_device = video->attached_array[i].bind_info;  in acpi_video_resume()
1769 		 * register video output if cooling device registration failed?  in acpi_video_dev_register_backlight()
1790 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)  in acpi_video_run_bcl_for_osi()  argument
1795 	mutex_lock(&video->device_list_lock);  in acpi_video_run_bcl_for_osi()
1796 	list_for_each_entry(dev, &video->video_device_list, entry) {  in acpi_video_run_bcl_for_osi()
1800 	mutex_unlock(&video->device_list_lock);  in acpi_video_run_bcl_for_osi()
1806 	 * Do not create backlight device for video output  in acpi_video_should_register_backlight()
1819 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)  in acpi_video_bus_register_backlight()  argument
1823 	if (video->backlight_registered)  in acpi_video_bus_register_backlight()
1829 	mutex_lock(&video->device_list_lock);  in acpi_video_bus_register_backlight()
1830 	list_for_each_entry(dev, &video->video_device_list, entry) {  in acpi_video_bus_register_backlight()
1834 	mutex_unlock(&video->device_list_lock);  in acpi_video_bus_register_backlight()
1836 	video->backlight_registered = true;  in acpi_video_bus_register_backlight()
1838 	video->pm_nb.notifier_call = acpi_video_resume;  in acpi_video_bus_register_backlight()
1839 	video->pm_nb.priority = 0;  in acpi_video_bus_register_backlight()
1840 	return register_pm_notifier(&video->pm_nb);  in acpi_video_bus_register_backlight()
1862 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)  in acpi_video_bus_unregister_backlight()  argument
1867 	if (!video->backlight_registered)  in acpi_video_bus_unregister_backlight()
1870 	error = unregister_pm_notifier(&video->pm_nb);  in acpi_video_bus_unregister_backlight()
1872 	mutex_lock(&video->device_list_lock);  in acpi_video_bus_unregister_backlight()
1873 	list_for_each_entry(dev, &video->video_device_list, entry)  in acpi_video_bus_unregister_backlight()
1875 	mutex_unlock(&video->device_list_lock);  in acpi_video_bus_unregister_backlight()
1877 	video->backlight_registered = false;  in acpi_video_bus_unregister_backlight()
1895 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)  in acpi_video_bus_add_notify_handler()  argument
1901 	video->input = input = input_allocate_device();  in acpi_video_bus_add_notify_handler()
1907 	error = acpi_video_bus_start_devices(video);  in acpi_video_bus_add_notify_handler()
1911 	snprintf(video->phys, sizeof(video->phys),  in acpi_video_bus_add_notify_handler()
1912 			"%s/video/input0", acpi_device_hid(video->device));  in acpi_video_bus_add_notify_handler()
1914 	input->name = acpi_device_name(video->device);  in acpi_video_bus_add_notify_handler()
1915 	input->phys = video->phys;  in acpi_video_bus_add_notify_handler()
1918 	input->dev.parent = &video->device->dev;  in acpi_video_bus_add_notify_handler()
1933 	mutex_lock(&video->device_list_lock);  in acpi_video_bus_add_notify_handler()
1934 	list_for_each_entry(dev, &video->video_device_list, entry)  in acpi_video_bus_add_notify_handler()
1936 	mutex_unlock(&video->device_list_lock);  in acpi_video_bus_add_notify_handler()
1941 	acpi_video_bus_stop_devices(video);  in acpi_video_bus_add_notify_handler()
1944 	video->input = NULL;  in acpi_video_bus_add_notify_handler()
1958 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)  in acpi_video_bus_remove_notify_handler()  argument
1962 	mutex_lock(&video->device_list_lock);  in acpi_video_bus_remove_notify_handler()
1963 	list_for_each_entry(dev, &video->video_device_list, entry)  in acpi_video_bus_remove_notify_handler()
1965 	mutex_unlock(&video->device_list_lock);  in acpi_video_bus_remove_notify_handler()
1967 	acpi_video_bus_stop_devices(video);  in acpi_video_bus_remove_notify_handler()
1968 	input_unregister_device(video->input);  in acpi_video_bus_remove_notify_handler()
1969 	video->input = NULL;  in acpi_video_bus_remove_notify_handler()
1972 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)  in acpi_video_bus_put_devices()  argument
1976 	mutex_lock(&video->device_list_lock);  in acpi_video_bus_put_devices()
1977 	list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {  in acpi_video_bus_put_devices()
1981 	mutex_unlock(&video->device_list_lock);  in acpi_video_bus_put_devices()
1990 	struct acpi_video_bus *video;  in acpi_video_bus_add()  local
2000 			"Duplicate ACPI video bus devices for the"  in acpi_video_bus_add()
2002 			"parameter \"video.allow_duplicates=1\""  in acpi_video_bus_add()
2008 	video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);  in acpi_video_bus_add()
2009 	if (!video)  in acpi_video_bus_add()
2025 	video->device = device;  in acpi_video_bus_add()
2028 	device->driver_data = video;  in acpi_video_bus_add()
2030 	acpi_video_bus_find_cap(video);  in acpi_video_bus_add()
2031 	error = acpi_video_bus_check(video);  in acpi_video_bus_add()
2035 	mutex_init(&video->device_list_lock);  in acpi_video_bus_add()
2036 	INIT_LIST_HEAD(&video->video_device_list);  in acpi_video_bus_add()
2038 	error = acpi_video_bus_get_devices(video, device);  in acpi_video_bus_add()
2044 	       video->flags.multihead ? "yes" : "no",  in acpi_video_bus_add()
2045 	       video->flags.rom ? "yes" : "no",  in acpi_video_bus_add()
2046 	       video->flags.post ? "yes" : "no");  in acpi_video_bus_add()
2048 	list_add_tail(&video->entry, &video_bus_head);  in acpi_video_bus_add()
2055 	acpi_video_run_bcl_for_osi(video);  in acpi_video_bus_add()
2056 	acpi_video_bus_add_notify_handler(video);  in acpi_video_bus_add()
2061 	acpi_video_bus_put_devices(video);  in acpi_video_bus_add()
2062 	kfree(video->attached_array);  in acpi_video_bus_add()
2064 	kfree(video);  in acpi_video_bus_add()
2072 	struct acpi_video_bus *video = NULL;  in acpi_video_bus_remove()  local
2078 	video = acpi_driver_data(device);  in acpi_video_bus_remove()
2081 	list_del(&video->entry);  in acpi_video_bus_remove()
2084 	acpi_video_bus_remove_notify_handler(video);  in acpi_video_bus_remove()
2085 	acpi_video_bus_unregister_backlight(video);  in acpi_video_bus_remove()
2086 	acpi_video_bus_put_devices(video);  in acpi_video_bus_remove()
2088 	kfree(video->attached_array);  in acpi_video_bus_remove()
2089 	kfree(video);  in acpi_video_bus_remove()
2242 	struct acpi_video_bus *video;  in acpi_video_register_backlight()  local
2245 	list_for_each_entry(video, &video_bus_head, entry)  in acpi_video_register_backlight()
2246 		acpi_video_bus_register_backlight(video);  in acpi_video_register_backlight()
2260  * the video opregion code to be run first in order to initialise
2261  * state before any ACPI video calls are made. To handle this we defer
2262  * registration of the video class until the opregion code has run.