3  *  video.c - ACPI Video Driver
26 #include <acpi/video.h>
31 #define ACPI_VIDEO_BUS_NAME		"Video Bus"
32 #define ACPI_VIDEO_DEVICE_NAME		"Video Device"
37 ACPI_MODULE_NAME("video");
40 MODULE_DESCRIPTION("ACPI Video Driver");
47  * By default, we don't allow duplicate ACPI video bus devices
107 	.name = "video",
118 	u8 multihead:1;		/* can switch video heads */
119 	u8 rom:1;		/* can retrieve a video rom */
130 	u8 _VPO:1;		/* Video POST Options */
207 	struct acpi_video_bus *video;  member
215 static void acpi_video_device_rebind(struct acpi_video_bus *video);
216 static void acpi_video_device_bind(struct acpi_video_bus *video,
218 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
264 	struct acpi_video_device *video = acpi_driver_data(device);  in video_get_max_state()  local
266 	*state = video->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1;  in video_get_max_state()
274 	struct acpi_video_device *video = acpi_driver_data(device);  in video_get_cur_state()  local
278 	if (acpi_video_device_lcd_get_level_current(video, &level, false))  in video_get_cur_state()
280 	for (offset = ACPI_VIDEO_FIRST_LEVEL; offset < video->brightness->count;  in video_get_cur_state()
282 		if (level == video->brightness->levels[offset]) {  in video_get_cur_state()
283 			*state = video->brightness->count - offset - 1;  in video_get_cur_state()
294 	struct acpi_video_device *video = acpi_driver_data(device);  in video_set_cur_state()  local
297 	if (state >= video->brightness->count - ACPI_VIDEO_FIRST_LEVEL)  in video_set_cur_state()
300 	state = video->brightness->count - state;  in video_set_cur_state()
301 	level = video->brightness->levels[state - 1];  in video_set_cur_state()
302 	return acpi_video_device_lcd_set_level(video, level);  in video_set_cur_state()
313  *                             Video Management
468 	 * Some machines have a broken acpi-video interface for brightness
515 	 * Some machines have multiple video output devices, but only the one
517 	 * register backlight interface for other video output devices.
532 	 * events, in this case acpi-video is considered the canonical source
635 			 * ACPI video backlight still works w/ buggy _BQC.  in acpi_video_device_lcd_get_level_current()
690  *	video		: video bus device pointer
710 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)  in acpi_video_bus_DOS()  argument
714 	if (!video->cap._DOS)  in acpi_video_bus_DOS()
719 	video->dos_setting = (lcd_flag << 2) | bios_flag;  in acpi_video_bus_DOS()
720 	status = acpi_execute_simple_method(video->device->handle, "_DOS",  in acpi_video_bus_DOS()
928  *	device	: video output device (LCD, CRT, ..)
1002  *	device	: video output device (LCD, CRT, ..)
1032  *	device	: video output device (VGA)
1037  *  Find out all required AML methods defined under the video bus device.
1040 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)  in acpi_video_bus_find_cap()  argument
1042 	if (acpi_has_method(video->device->handle, "_DOS"))  in acpi_video_bus_find_cap()
1043 		video->cap._DOS = 1;  in acpi_video_bus_find_cap()
1044 	if (acpi_has_method(video->device->handle, "_DOD"))  in acpi_video_bus_find_cap()
1045 		video->cap._DOD = 1;  in acpi_video_bus_find_cap()
1046 	if (acpi_has_method(video->device->handle, "_ROM"))  in acpi_video_bus_find_cap()
1047 		video->cap._ROM = 1;  in acpi_video_bus_find_cap()
1048 	if (acpi_has_method(video->device->handle, "_GPD"))  in acpi_video_bus_find_cap()
1049 		video->cap._GPD = 1;  in acpi_video_bus_find_cap()
1050 	if (acpi_has_method(video->device->handle, "_SPD"))  in acpi_video_bus_find_cap()
1051 		video->cap._SPD = 1;  in acpi_video_bus_find_cap()
1052 	if (acpi_has_method(video->device->handle, "_VPO"))  in acpi_video_bus_find_cap()
1053 		video->cap._VPO = 1;  in acpi_video_bus_find_cap()
1057  * Check whether the video bus device has required AML method to
1061 static int acpi_video_bus_check(struct acpi_video_bus *video)  in acpi_video_bus_check()  argument
1066 	if (!video)  in acpi_video_bus_check()
1069 	dev = acpi_get_pci_dev(video->device->handle);  in acpi_video_bus_check()
1079 	/* Does this device support video switching? */  in acpi_video_bus_check()
1080 	if (video->cap._DOS || video->cap._DOD) {  in acpi_video_bus_check()
1081 		if (!video->cap._DOS) {  in acpi_video_bus_check()
1084 				acpi_device_bid(video->device));  in acpi_video_bus_check()
1086 		video->flags.multihead = 1;  in acpi_video_bus_check()
1090 	/* Does this device support retrieving a video ROM? */  in acpi_video_bus_check()
1091 	if (video->cap._ROM) {  in acpi_video_bus_check()
1092 		video->flags.rom = 1;  in acpi_video_bus_check()
1096 	/* Does this device support configuring which video device to POST? */  in acpi_video_bus_check()
1097 	if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {  in acpi_video_bus_check()
1098 		video->flags.post = 1;  in acpi_video_bus_check()
1113 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)  in acpi_video_get_device_attr()  argument
1118 	for (i = 0; i < video->attached_count; i++) {  in acpi_video_get_device_attr()
1119 		ids = &video->attached_array[i];  in acpi_video_get_device_attr()
1128 acpi_video_get_device_type(struct acpi_video_bus *video,  in acpi_video_get_device_type()  argument
1134 	for (i = 0; i < video->attached_count; i++) {  in acpi_video_get_device_type()
1135 		ids = &video->attached_array[i];  in acpi_video_get_device_type()
1145 			      struct acpi_video_bus *video)  in acpi_video_bus_get_one_device()  argument
1167 	data->video = video;  in acpi_video_bus_get_one_device()
1172 	attribute = acpi_video_get_device_attr(video, device_id);  in acpi_video_bus_get_one_device()
1196 		device_type = acpi_video_get_device_type(video, device_id);  in acpi_video_bus_get_one_device()
1213 	acpi_video_device_bind(video, data);  in acpi_video_bus_get_one_device()
1216 	mutex_lock(&video->device_list_lock);  in acpi_video_bus_get_one_device()
1217 	list_add_tail(&data->entry, &video->video_device_list);  in acpi_video_bus_get_one_device()
1218 	mutex_unlock(&video->device_list_lock);  in acpi_video_bus_get_one_device()
1225  *	video	: video bus device
1230  *  Enumerate the video device list of the video bus,
1231  *  bind the ids with the corresponding video devices
1232  *  under the video bus.
1235 static void acpi_video_device_rebind(struct acpi_video_bus *video)  in acpi_video_device_rebind()  argument
1239 	mutex_lock(&video->device_list_lock);  in acpi_video_device_rebind()
1241 	list_for_each_entry(dev, &video->video_device_list, entry)  in acpi_video_device_rebind()
1242 		acpi_video_device_bind(video, dev);  in acpi_video_device_rebind()
1244 	mutex_unlock(&video->device_list_lock);  in acpi_video_device_rebind()
1249  *	video	: video bus device
1250  *	device	: video output device under the video
1256  *  Bind the ids with the corresponding video devices
1257  *  under the video bus.
1261 acpi_video_device_bind(struct acpi_video_bus *video,  in acpi_video_device_bind()  argument
1267 	for (i = 0; i < video->attached_count; i++) {  in acpi_video_device_bind()
1268 		ids = &video->attached_array[i];  in acpi_video_device_bind()
1278 	struct acpi_video_bus *video = device->video;  in acpi_video_device_in_dod()  local
1286 	if (!video->attached_count || video->child_count > 8)  in acpi_video_device_in_dod()
1289 	for (i = 0; i < video->attached_count; i++) {  in acpi_video_device_in_dod()
1290 		if ((video->attached_array[i].value.int_val & 0xfff) ==  in acpi_video_device_in_dod()
1300  *	video	: video bus device
1309 static int acpi_video_device_enumerate(struct acpi_video_bus *video)  in acpi_video_device_enumerate()  argument
1319 	if (!video->cap._DOD)  in acpi_video_device_enumerate()
1322 	status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);  in acpi_video_device_enumerate()
1335 	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",  in acpi_video_device_enumerate()
1363 	kfree(video->attached_array);  in acpi_video_device_enumerate()
1365 	video->attached_array = active_list;  in acpi_video_device_enumerate()
1366 	video->attached_count = count;  in acpi_video_device_enumerate()
1456 	struct acpi_video_bus *video;  in acpi_video_get_edid()  local
1465 	video = acpi_driver_data(device);  in acpi_video_get_edid()
1467 	for (i = 0; i < video->attached_count; i++) {  in acpi_video_get_edid()
1468 		video_device = video->attached_array[i].bind_info;  in acpi_video_get_edid()
1522 acpi_video_bus_get_devices(struct acpi_video_bus *video,  in acpi_video_bus_get_devices()  argument
1529 	 * There are systems where video module known to work fine regardless  in acpi_video_bus_get_devices()
1533 	acpi_video_device_enumerate(video);  in acpi_video_bus_get_devices()
1537 		status = acpi_video_bus_get_one_device(dev, video);  in acpi_video_bus_get_devices()
1542 		video->child_count++;  in acpi_video_bus_get_devices()
1553 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)  in acpi_video_bus_start_devices()  argument
1555 	return acpi_video_bus_DOS(video, 0,  in acpi_video_bus_start_devices()
1559 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)  in acpi_video_bus_stop_devices()  argument
1561 	return acpi_video_bus_DOS(video, 0,  in acpi_video_bus_stop_devices()
1567 	struct acpi_video_bus *video = acpi_driver_data(device);  in acpi_video_bus_notify()  local
1571 	if (!video || !video->input)  in acpi_video_bus_notify()
1574 	input = video->input;  in acpi_video_bus_notify()
1582 	case ACPI_VIDEO_NOTIFY_PROBE:	/* User plugged in or removed a video  in acpi_video_bus_notify()
1584 		acpi_video_device_enumerate(video);  in acpi_video_bus_notify()
1585 		acpi_video_device_rebind(video);  in acpi_video_bus_notify()
1641 	bus = video_device->video;  in acpi_video_device_notify()
1694 	struct acpi_video_bus *video;  in acpi_video_resume()  local
1705 	video = container_of(nb, struct acpi_video_bus, pm_nb);  in acpi_video_resume()
1707 	dev_info(&video->device->dev, "Restoring backlight state\n");  in acpi_video_resume()
1709 	for (i = 0; i < video->attached_count; i++) {  in acpi_video_resume()
1710 		video_device = video->attached_array[i].bind_info;  in acpi_video_resume()
1798 		 * register video output if cooling device registration failed?  in acpi_video_dev_register_backlight()
1818 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)  in acpi_video_run_bcl_for_osi()  argument
1823 	mutex_lock(&video->device_list_lock);  in acpi_video_run_bcl_for_osi()
1824 	list_for_each_entry(dev, &video->video_device_list, entry) {  in acpi_video_run_bcl_for_osi()
1828 	mutex_unlock(&video->device_list_lock);  in acpi_video_run_bcl_for_osi()
1834 	 * Do not create backlight device for video output  in acpi_video_should_register_backlight()
1847 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)  in acpi_video_bus_register_backlight()  argument
1851 	if (video->backlight_registered)  in acpi_video_bus_register_backlight()
1854 	acpi_video_run_bcl_for_osi(video);  in acpi_video_bus_register_backlight()
1859 	mutex_lock(&video->device_list_lock);  in acpi_video_bus_register_backlight()
1860 	list_for_each_entry(dev, &video->video_device_list, entry) {  in acpi_video_bus_register_backlight()
1864 	mutex_unlock(&video->device_list_lock);  in acpi_video_bus_register_backlight()
1866 	video->backlight_registered = true;  in acpi_video_bus_register_backlight()
1868 	video->pm_nb.notifier_call = acpi_video_resume;  in acpi_video_bus_register_backlight()
1869 	video->pm_nb.priority = 0;  in acpi_video_bus_register_backlight()
1870 	return register_pm_notifier(&video->pm_nb);  in acpi_video_bus_register_backlight()
1892 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)  in acpi_video_bus_unregister_backlight()  argument
1897 	if (!video->backlight_registered)  in acpi_video_bus_unregister_backlight()
1900 	error = unregister_pm_notifier(&video->pm_nb);  in acpi_video_bus_unregister_backlight()
1902 	mutex_lock(&video->device_list_lock);  in acpi_video_bus_unregister_backlight()
1903 	list_for_each_entry(dev, &video->video_device_list, entry)  in acpi_video_bus_unregister_backlight()
1905 	mutex_unlock(&video->device_list_lock);  in acpi_video_bus_unregister_backlight()
1907 	video->backlight_registered = false;  in acpi_video_bus_unregister_backlight()
1925 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)  in acpi_video_bus_add_notify_handler()  argument
1931 	video->input = input = input_allocate_device();  in acpi_video_bus_add_notify_handler()
1937 	error = acpi_video_bus_start_devices(video);  in acpi_video_bus_add_notify_handler()
1941 	snprintf(video->phys, sizeof(video->phys),  in acpi_video_bus_add_notify_handler()
1942 			"%s/video/input0", acpi_device_hid(video->device));  in acpi_video_bus_add_notify_handler()
1944 	input->name = acpi_device_name(video->device);  in acpi_video_bus_add_notify_handler()
1945 	input->phys = video->phys;  in acpi_video_bus_add_notify_handler()
1948 	input->dev.parent = &video->device->dev;  in acpi_video_bus_add_notify_handler()
1963 	mutex_lock(&video->device_list_lock);  in acpi_video_bus_add_notify_handler()
1964 	list_for_each_entry(dev, &video->video_device_list, entry)  in acpi_video_bus_add_notify_handler()
1966 	mutex_unlock(&video->device_list_lock);  in acpi_video_bus_add_notify_handler()
1971 	acpi_video_bus_stop_devices(video);  in acpi_video_bus_add_notify_handler()
1974 	video->input = NULL;  in acpi_video_bus_add_notify_handler()
1988 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)  in acpi_video_bus_remove_notify_handler()  argument
1992 	mutex_lock(&video->device_list_lock);  in acpi_video_bus_remove_notify_handler()
1993 	list_for_each_entry(dev, &video->video_device_list, entry)  in acpi_video_bus_remove_notify_handler()
1995 	mutex_unlock(&video->device_list_lock);  in acpi_video_bus_remove_notify_handler()
1997 	acpi_video_bus_stop_devices(video);  in acpi_video_bus_remove_notify_handler()
1998 	input_unregister_device(video->input);  in acpi_video_bus_remove_notify_handler()
1999 	video->input = NULL;  in acpi_video_bus_remove_notify_handler()
2002 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)  in acpi_video_bus_put_devices()  argument
2006 	mutex_lock(&video->device_list_lock);  in acpi_video_bus_put_devices()
2007 	list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {  in acpi_video_bus_put_devices()
2011 	mutex_unlock(&video->device_list_lock);  in acpi_video_bus_put_devices()
2020 	struct acpi_video_bus *video;  in acpi_video_bus_add()  local
2030 			"Duplicate ACPI video bus devices for the"  in acpi_video_bus_add()
2032 			"parameter \"video.allow_duplicates=1\""  in acpi_video_bus_add()
2038 	video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);  in acpi_video_bus_add()
2039 	if (!video)  in acpi_video_bus_add()
2055 	video->device = device;  in acpi_video_bus_add()
2058 	device->driver_data = video;  in acpi_video_bus_add()
2060 	acpi_video_bus_find_cap(video);  in acpi_video_bus_add()
2061 	error = acpi_video_bus_check(video);  in acpi_video_bus_add()
2065 	mutex_init(&video->device_list_lock);  in acpi_video_bus_add()
2066 	INIT_LIST_HEAD(&video->video_device_list);  in acpi_video_bus_add()
2068 	error = acpi_video_bus_get_devices(video, device);  in acpi_video_bus_add()
2074 	       video->flags.multihead ? "yes" : "no",  in acpi_video_bus_add()
2075 	       video->flags.rom ? "yes" : "no",  in acpi_video_bus_add()
2076 	       video->flags.post ? "yes" : "no");  in acpi_video_bus_add()
2078 	list_add_tail(&video->entry, &video_bus_head);  in acpi_video_bus_add()
2081 	acpi_video_bus_register_backlight(video);  in acpi_video_bus_add()
2082 	acpi_video_bus_add_notify_handler(video);  in acpi_video_bus_add()
2087 	acpi_video_bus_put_devices(video);  in acpi_video_bus_add()
2088 	kfree(video->attached_array);  in acpi_video_bus_add()
2090 	kfree(video);  in acpi_video_bus_add()
2098 	struct acpi_video_bus *video = NULL;  in acpi_video_bus_remove()  local
2104 	video = acpi_driver_data(device);  in acpi_video_bus_remove()
2106 	acpi_video_bus_remove_notify_handler(video);  in acpi_video_bus_remove()
2107 	acpi_video_bus_unregister_backlight(video);  in acpi_video_bus_remove()
2108 	acpi_video_bus_put_devices(video);  in acpi_video_bus_remove()
2111 	list_del(&video->entry);  in acpi_video_bus_remove()
2114 	kfree(video->attached_array);  in acpi_video_bus_remove()
2115 	kfree(video);  in acpi_video_bus_remove()
2236 	struct acpi_video_bus *video;  in acpi_video_unregister_backlight()  local
2241 		list_for_each_entry(video, &video_bus_head, entry)  in acpi_video_unregister_backlight()
2242 			acpi_video_bus_unregister_backlight(video);  in acpi_video_unregister_backlight()
2263  * the video opregion code to be run first in order to initialise
2264  * state before any ACPI video calls are made. To handle this we defer
2265  * registration of the video class until the opregion code has run.