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11#include <linux/module.h>
12#include <linux/usb.h>
13#include <linux/device.h>
14#include <linux/errno.h>
15#include <linux/kernel.h>
16#include <linux/acpi.h>
17#include <linux/pci.h>
18#include <linux/usb/hcd.h>
19
20#include "hub.h"
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30bool usb_acpi_power_manageable(struct usb_device *hdev, int index)
31{
32 acpi_handle port_handle;
33 int port1 = index + 1;
34
35 port_handle = usb_get_hub_port_acpi_handle(hdev,
36 port1);
37 if (port_handle)
38 return acpi_bus_power_manageable(port_handle);
39 else
40 return false;
41}
42EXPORT_SYMBOL_GPL(usb_acpi_power_manageable);
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55
56int usb_acpi_set_power_state(struct usb_device *hdev, int index, bool enable)
57{
58 struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
59 struct usb_port *port_dev;
60 acpi_handle port_handle;
61 unsigned char state;
62 int port1 = index + 1;
63 int error = -EINVAL;
64
65 if (!hub)
66 return -ENODEV;
67 port_dev = hub->ports[port1 - 1];
68
69 port_handle = (acpi_handle) usb_get_hub_port_acpi_handle(hdev, port1);
70 if (!port_handle)
71 return error;
72
73 if (enable)
74 state = ACPI_STATE_D0;
75 else
76 state = ACPI_STATE_D3_COLD;
77
78 error = acpi_bus_set_power(port_handle, state);
79 if (!error)
80 dev_dbg(&port_dev->dev, "acpi: power was set to %d\n", enable);
81 else
82 dev_dbg(&port_dev->dev, "acpi: power failed to be set\n");
83
84 return error;
85}
86EXPORT_SYMBOL_GPL(usb_acpi_set_power_state);
87
88static enum usb_port_connect_type usb_acpi_get_connect_type(acpi_handle handle,
89 struct acpi_pld_info *pld)
90{
91 enum usb_port_connect_type connect_type = USB_PORT_CONNECT_TYPE_UNKNOWN;
92 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
93 union acpi_object *upc;
94 acpi_status status;
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104 status = acpi_evaluate_object(handle, "_UPC", NULL, &buffer);
105 upc = buffer.pointer;
106 if (!upc || (upc->type != ACPI_TYPE_PACKAGE)
107 || upc->package.count != 4) {
108 goto out;
109 }
110
111 if (upc->package.elements[0].integer.value)
112 if (pld->user_visible)
113 connect_type = USB_PORT_CONNECT_TYPE_HOT_PLUG;
114 else
115 connect_type = USB_PORT_CONNECT_TYPE_HARD_WIRED;
116 else if (!pld->user_visible)
117 connect_type = USB_PORT_NOT_USED;
118out:
119 kfree(upc);
120 return connect_type;
121}
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127
128#define USB_ACPI_LOCATION_VALID (1 << 31)
129
130static struct acpi_device *usb_acpi_find_companion(struct device *dev)
131{
132 struct usb_device *udev;
133 struct acpi_device *adev;
134 acpi_handle *parent_handle;
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149 if (is_usb_device(dev)) {
150 udev = to_usb_device(dev);
151 if (udev->parent)
152 return NULL;
153
154
155 adev = ACPI_COMPANION(dev->parent);
156 return acpi_find_child_device(adev, 0, false);
157 } else if (is_usb_port(dev)) {
158 struct usb_port *port_dev = to_usb_port(dev);
159 int port1 = port_dev->portnum;
160 struct acpi_pld_info *pld;
161 acpi_handle *handle;
162 acpi_status status;
163
164
165 udev = to_usb_device(dev->parent->parent);
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171
172 if (!udev->parent) {
173 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
174 int raw;
175
176 raw = usb_hcd_find_raw_port_number(hcd, port1);
177 adev = acpi_find_child_device(ACPI_COMPANION(&udev->dev),
178 raw, false);
179 if (!adev)
180 return NULL;
181 } else {
182 parent_handle =
183 usb_get_hub_port_acpi_handle(udev->parent,
184 udev->portnum);
185 if (!parent_handle)
186 return NULL;
187
188 acpi_bus_get_device(parent_handle, &adev);
189 adev = acpi_find_child_device(adev, port1, false);
190 if (!adev)
191 return NULL;
192 }
193 handle = adev->handle;
194 status = acpi_get_physical_device_location(handle, &pld);
195 if (ACPI_FAILURE(status) || !pld)
196 return adev;
197
198 port_dev->location = USB_ACPI_LOCATION_VALID
199 | pld->group_token << 8 | pld->group_position;
200 port_dev->connect_type = usb_acpi_get_connect_type(handle, pld);
201 ACPI_FREE(pld);
202
203 return adev;
204 }
205
206 return NULL;
207}
208
209static bool usb_acpi_bus_match(struct device *dev)
210{
211 return is_usb_device(dev) || is_usb_port(dev);
212}
213
214static struct acpi_bus_type usb_acpi_bus = {
215 .name = "USB",
216 .match = usb_acpi_bus_match,
217 .find_companion = usb_acpi_find_companion,
218};
219
220int usb_acpi_register(void)
221{
222 return register_acpi_bus_type(&usb_acpi_bus);
223}
224
225void usb_acpi_unregister(void)
226{
227 unregister_acpi_bus_type(&usb_acpi_bus);
228}
229