1 // SPDX-License-Identifier: GPL-2.0
3  * USB-ACPI glue code
8 #include <linux/usb.h>
14 #include <linux/usb/hcd.h>
16 #include "hub.h"
19  * usb_acpi_power_manageable - check whether usb port has
21  * @hdev: USB device belonging to the usb hub
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.
45  * @hdev: USB device belonging to the usb hub
51  * Arg0: UUID = ce2ee385-00e6-48cb-9f05-2edb927c4899
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()
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()
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
104  * @hdev: USB device belonging to the usb hub
108  * Notice to use usb_acpi_power_manageable() to check whether the usb port
115 	struct usb_hub *hub = usb_hub_to_struct_hub(hdev);  in usb_acpi_set_power_state()  local
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()
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()
154 	 * According to 9.14 in ACPI Spec 6.2. _PLD indicates whether usb port  in usb_acpi_get_connect_type()
157 	 * and disconnected with USB devices. If no visible and connectable,  in usb_acpi_get_connect_type()
158 	 * a usb device is directly hard-wired to the port. If no visible and  in usb_acpi_get_connect_type()
166 	if (!upc || (upc->type != ACPI_TYPE_PACKAGE) || upc->package.count != 4)  in usb_acpi_get_connect_type()
169 	if (upc->package.elements[0].integer.value)  in usb_acpi_get_connect_type()
170 		if (pld->user_visible)  in usb_acpi_get_connect_type()
174 	else if (!pld->user_visible)  in usb_acpi_get_connect_type()
183  * Private to usb-acpi, all the core needs to know is that
184  * port_dev->location is non-zero when it has been set by the firmware.
196 	/* Get the struct usb_device point of port's hub */  in usb_acpi_get_companion_for_port()
197 	udev = to_usb_device(port_dev->dev.parent->parent);  in usb_acpi_get_companion_for_port()
200 	 * The root hub ports' parent is the root hub. The non-root-hub  in usb_acpi_get_companion_for_port()
201 	 * ports' parent is the parent hub port which the hub is  in usb_acpi_get_companion_for_port()
204 	if (!udev->parent) {  in usb_acpi_get_companion_for_port()
205 		adev = ACPI_COMPANION(&udev->dev);  in usb_acpi_get_companion_for_port()
206 		port1 = usb_hcd_find_raw_port_number(bus_to_hcd(udev->bus),  in usb_acpi_get_companion_for_port()
207 						     port_dev->portnum);  in usb_acpi_get_companion_for_port()
209 		parent_handle = usb_get_hub_port_acpi_handle(udev->parent,  in usb_acpi_get_companion_for_port()
210 							     udev->portnum);  in usb_acpi_get_companion_for_port()
215 		port1 = port_dev->portnum;  in usb_acpi_get_companion_for_port()
233 	handle = adev->handle;  in usb_acpi_find_companion_for_port()
236 		port_dev->location = USB_ACPI_LOCATION_VALID  in usb_acpi_find_companion_for_port()
237 			| pld->group_token << 8 | pld->group_position;  in usb_acpi_find_companion_for_port()
238 		port_dev->connect_type = usb_acpi_get_connect_type(handle, pld);  in usb_acpi_find_companion_for_port()
250 	struct usb_hub *hub;  in usb_acpi_find_companion_for_device()  local
252 	if (!udev->parent) {  in usb_acpi_find_companion_for_device()
254 		 * root hub is only child (_ADR=0) under its parent, the HC.  in usb_acpi_find_companion_for_device()
257 		adev = ACPI_COMPANION(udev->bus->sysdev);  in usb_acpi_find_companion_for_device()
261 	hub = usb_hub_to_struct_hub(udev->parent);  in usb_acpi_find_companion_for_device()
262 	if (!hub)  in usb_acpi_find_companion_for_device()
266 	 * This is an embedded USB device connected to a port and such  in usb_acpi_find_companion_for_device()
269 	port_dev = hub->ports[udev->portnum - 1];  in usb_acpi_find_companion_for_device()
276 	 * The USB hierarchy like following:  in usb_acpi_find_companion()
287 	 * where HUBN is root hub, and PRNN are USB ports and devices  in usb_acpi_find_companion()
289 	 * connected composite USB devices. PRNN and FNNN may contain  in usb_acpi_find_companion()
293 	 * On the kernel side both root hub and embedded USB devices are  in usb_acpi_find_companion()
301 	 * devices corresponding to USB interfaces.  in usb_acpi_find_companion()
317 	.name = "USB",