1 // SPDX-License-Identifier: GPL-2.0
3  * USB-ACPI glue code
19  * usb_acpi_power_manageable - check whether usb port has
24  * Return true if the port has acpi power resource and false if no.
33 	if (port_handle)  in usb_acpi_power_manageable()
40 #define UUID_USB_CONTROLLER_DSM "ce2ee385-00e6-48cb-9f05-2edb927c4899"
44  * usb_acpi_port_lpm_incapable - check if lpm should be disabled for a port.
48  * Some USB3 ports may not support USB3 link power management U1/U2 states
50  * if U1 and U2 states should be disabled. Evaluate _DSM with:
51  * Arg0: UUID = ce2ee385-00e6-48cb-9f05-2edb927c4899
56  * Return 1 if USB3 port is LPM incapable, negative on error, otherwise 0
68 	if (ret)  in usb_acpi_port_lpm_incapable()
72 	if (!port_handle) {  in usb_acpi_port_lpm_incapable()
73 		dev_dbg(&hdev->dev, "port-%d no acpi handle\n", port1);  in usb_acpi_port_lpm_incapable()
74 		return -ENODEV;  in usb_acpi_port_lpm_incapable()
77 	if (!acpi_check_dsm(port_handle, &guid, 0,  in usb_acpi_port_lpm_incapable()
79 		dev_dbg(&hdev->dev, "port-%d no _DSM function %d\n",  in usb_acpi_port_lpm_incapable()
81 		return -ENODEV;  in usb_acpi_port_lpm_incapable()
87 	if (!obj) {  in usb_acpi_port_lpm_incapable()
88 		dev_dbg(&hdev->dev, "evaluate port-%d _DSM failed\n", port1);  in usb_acpi_port_lpm_incapable()
89 		return -EINVAL;  in usb_acpi_port_lpm_incapable()
92 	if (obj->integer.value == 0x01)  in usb_acpi_port_lpm_incapable()
102  * usb_acpi_set_power_state - control usb port's power via acpi power
120 	int error = -EINVAL;  in usb_acpi_set_power_state()
122 	if (!hub)  in usb_acpi_set_power_state()
123 		return -ENODEV;  in usb_acpi_set_power_state()
124 	port_dev = hub->ports[port1 - 1];  in usb_acpi_set_power_state()
127 	if (!port_handle)  in usb_acpi_set_power_state()
130 	if (enable)  in usb_acpi_set_power_state()
136 	if (!error)  in usb_acpi_set_power_state()
137 		dev_dbg(&port_dev->dev, "acpi: power was set to %d\n", enable);  in usb_acpi_set_power_state()
139 		dev_dbg(&port_dev->dev, "acpi: power failed to be set\n");  in usb_acpi_set_power_state()
146  * usb_acpi_add_usb4_devlink - add device link to USB4 Host Interface for tunneled USB3 devices
148  * @udev: Tunneled USB3 device connected to a roothub.
150  * Adds a device link between a tunneled USB3 device and the USB4 Host Interface
152  * should only be called for tunneled USB3 devices.
164 	if (!udev->parent || udev->parent->parent)  in usb_acpi_add_usb4_devlink()
167 	hub = usb_hub_to_struct_hub(udev->parent);  in usb_acpi_add_usb4_devlink()
168 	port_dev = hub->ports[udev->portnum - 1];  in usb_acpi_add_usb4_devlink()
171 		fwnode_find_reference(dev_fwnode(&port_dev->dev), "usb4-host-interface", 0);  in usb_acpi_add_usb4_devlink()
173 	if (IS_ERR(nhi_fwnode) || !nhi_fwnode->dev)  in usb_acpi_add_usb4_devlink()
176 	link = device_link_add(&port_dev->child->dev, nhi_fwnode->dev,  in usb_acpi_add_usb4_devlink()
180 	if (!link) {  in usb_acpi_add_usb4_devlink()
181 		dev_err(&port_dev->dev, "Failed to created device link from %s to %s\n",  in usb_acpi_add_usb4_devlink()
182 			dev_name(&port_dev->child->dev), dev_name(nhi_fwnode->dev));  in usb_acpi_add_usb4_devlink()
183 		return -EINVAL;  in usb_acpi_add_usb4_devlink()
186 	dev_dbg(&port_dev->dev, "Created device link from %s to %s\n",  in usb_acpi_add_usb4_devlink()
187 		dev_name(&port_dev->child->dev), dev_name(nhi_fwnode->dev));  in usb_acpi_add_usb4_devlink()
193  * Private to usb-acpi, all the core needs to know is that
194  * port_dev->location is non-zero when it has been set by the firmware.
209 	 * is user visible and _UPC indicates whether it is connectable. If  in usb_acpi_get_connect_type()
211 	 * and disconnected with USB devices. If no visible and connectable,  in usb_acpi_get_connect_type()
212 	 * a usb device is directly hard-wired to the port. If no visible and  in usb_acpi_get_connect_type()
217 	if (ACPI_SUCCESS(status) && pld)  in usb_acpi_get_connect_type()
218 		port_dev->location = USB_ACPI_LOCATION_VALID |  in usb_acpi_get_connect_type()
219 			pld->group_token << 8 | pld->group_position;  in usb_acpi_get_connect_type()
222 	if (ACPI_FAILURE(status))  in usb_acpi_get_connect_type()
226 	if (!upc || (upc->type != ACPI_TYPE_PACKAGE) || upc->package.count != 4)  in usb_acpi_get_connect_type()
230 	if (upc->package.elements[0].integer.value)  in usb_acpi_get_connect_type()
231 		if (!pld)  in usb_acpi_get_connect_type()
233 		else if (pld->user_visible)  in usb_acpi_get_connect_type()
240 	port_dev->connect_type = connect_type;  in usb_acpi_get_connect_type()
254 	udev = to_usb_device(port_dev->dev.parent->parent);  in usb_acpi_get_companion_for_port()
257 	 * The root hub ports' parent is the root hub. The non-root-hub  in usb_acpi_get_companion_for_port()
261 	if (!udev->parent) {  in usb_acpi_get_companion_for_port()
262 		adev = ACPI_COMPANION(&udev->dev);  in usb_acpi_get_companion_for_port()
263 		port1 = usb_hcd_find_raw_port_number(bus_to_hcd(udev->bus),  in usb_acpi_get_companion_for_port()
264 						     port_dev->portnum);  in usb_acpi_get_companion_for_port()
266 		parent_handle = usb_get_hub_port_acpi_handle(udev->parent,  in usb_acpi_get_companion_for_port()
267 							     udev->portnum);  in usb_acpi_get_companion_for_port()
268 		if (!parent_handle)  in usb_acpi_get_companion_for_port()
272 		port1 = port_dev->portnum;  in usb_acpi_get_companion_for_port()
284 	if (!adev)  in usb_acpi_find_companion_for_port()
287 	usb_acpi_get_connect_type(port_dev, adev->handle);  in usb_acpi_find_companion_for_port()
299 	if (!udev->parent) {  in usb_acpi_find_companion_for_device()
304 		adev = ACPI_COMPANION(udev->bus->sysdev);  in usb_acpi_find_companion_for_device()
308 	hub = usb_hub_to_struct_hub(udev->parent);  in usb_acpi_find_companion_for_device()
309 	if (!hub)  in usb_acpi_find_companion_for_device()
313 	/* Tunneled USB3 devices depend on USB4 Host Interface, set device link to it */  in usb_acpi_find_companion_for_device()
314 	if (udev->speed >= USB_SPEED_SUPER &&  in usb_acpi_find_companion_for_device()
315 	    udev->tunnel_mode != USB_LINK_NATIVE)  in usb_acpi_find_companion_for_device()
322 	port_dev = hub->ports[udev->portnum - 1];  in usb_acpi_find_companion_for_device()
356 	if (is_usb_device(dev))  in usb_acpi_find_companion()
358 	else if (is_usb_port(dev))  in usb_acpi_find_companion()