blob: b6f4bad3f756eefb173097767ffde6970e06220e [file] [log] [blame]
Matthew Garrettda0af6e2012-05-11 16:08:27 +08001/*
2 * USB-ACPI glue code
3 *
4 * Copyright 2012 Red Hat <mjg@redhat.com>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation, version 2.
9 *
10 */
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 <acpi/acpi_bus.h>
19
20#include "usb.h"
21
Lan Tianyuf7ac7782012-09-05 13:44:36 +080022/**
23 * usb_acpi_power_manageable - check whether usb port has
24 * acpi power resource.
25 * @hdev: USB device belonging to the usb hub
26 * @index: port index based zero
27 *
28 * Return true if the port has acpi power resource and false if no.
29 */
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);
43
44/**
45 * usb_acpi_set_power_state - control usb port's power via acpi power
46 * resource
47 * @hdev: USB device belonging to the usb hub
48 * @index: port index based zero
49 * @enable: power state expected to be set
50 *
51 * Notice to use usb_acpi_power_manageable() to check whether the usb port
52 * has acpi power resource before invoking this function.
53 *
54 * Returns 0 on success, else negative errno.
55 */
56int usb_acpi_set_power_state(struct usb_device *hdev, int index, bool enable)
57{
58 acpi_handle port_handle;
59 unsigned char state;
60 int port1 = index + 1;
61 int error = -EINVAL;
62
63 port_handle = (acpi_handle)usb_get_hub_port_acpi_handle(hdev,
64 port1);
65 if (!port_handle)
66 return error;
67
68 if (enable)
69 state = ACPI_STATE_D0;
70 else
71 state = ACPI_STATE_D3_COLD;
72
73 error = acpi_bus_set_power(port_handle, state);
74 if (!error)
75 dev_dbg(&hdev->dev, "The power of hub port %d was set to %d\n",
76 port1, enable);
77 else
78 dev_dbg(&hdev->dev, "The power of hub port failed to be set\n");
79
80 return error;
81}
82EXPORT_SYMBOL_GPL(usb_acpi_set_power_state);
83
Lan Tianyu05f91682012-09-05 13:44:34 +080084static int usb_acpi_check_port_connect_type(struct usb_device *hdev,
85 acpi_handle handle, int port1)
Matthew Garrett54d3f8c2012-05-11 16:08:28 +080086{
87 acpi_status status;
88 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
89 union acpi_object *upc;
Linus Torvaldsd8dc91b2012-10-08 07:14:06 +090090 struct acpi_pld_info *pld;
Matthew Garrett54d3f8c2012-05-11 16:08:28 +080091 int ret = 0;
92
Lan Tianyu05f91682012-09-05 13:44:34 +080093 /*
94 * Accoding to ACPI Spec 9.13. PLD indicates whether usb port is
95 * user visible and _UPC indicates whether it is connectable. If
96 * the port was visible and connectable, it could be freely connected
97 * and disconnected with USB devices. If no visible and connectable,
98 * a usb device is directly hard-wired to the port. If no visible and
99 * no connectable, the port would be not used.
100 */
101 status = acpi_get_physical_device_location(handle, &pld);
Matthew Garrett54d3f8c2012-05-11 16:08:28 +0800102 if (ACPI_FAILURE(status))
103 return -ENODEV;
104
Lan Tianyu05f91682012-09-05 13:44:34 +0800105 status = acpi_evaluate_object(handle, "_UPC", NULL, &buffer);
Matthew Garrett54d3f8c2012-05-11 16:08:28 +0800106 upc = buffer.pointer;
Matthew Garrett54d3f8c2012-05-11 16:08:28 +0800107 if (!upc || (upc->type != ACPI_TYPE_PACKAGE)
108 || upc->package.count != 4) {
109 ret = -EINVAL;
110 goto out;
111 }
112
113 if (upc->package.elements[0].integer.value)
Linus Torvaldsd8dc91b2012-10-08 07:14:06 +0900114 if (pld->user_visible)
Lan Tianyu05f91682012-09-05 13:44:34 +0800115 usb_set_hub_port_connect_type(hdev, port1,
116 USB_PORT_CONNECT_TYPE_HOT_PLUG);
117 else
118 usb_set_hub_port_connect_type(hdev, port1,
119 USB_PORT_CONNECT_TYPE_HARD_WIRED);
Linus Torvaldsd8dc91b2012-10-08 07:14:06 +0900120 else if (!pld->user_visible)
Lan Tianyu05f91682012-09-05 13:44:34 +0800121 usb_set_hub_port_connect_type(hdev, port1, USB_PORT_NOT_USED);
Matthew Garrett54d3f8c2012-05-11 16:08:28 +0800122
123out:
Linus Torvaldsd8dc91b2012-10-08 07:14:06 +0900124 ACPI_FREE(pld);
Matthew Garrett54d3f8c2012-05-11 16:08:28 +0800125 kfree(upc);
126 return ret;
127}
128
Matthew Garrettda0af6e2012-05-11 16:08:27 +0800129static int usb_acpi_find_device(struct device *dev, acpi_handle *handle)
130{
131 struct usb_device *udev;
Matthew Garrettda0af6e2012-05-11 16:08:27 +0800132 acpi_handle *parent_handle;
Lan Tianyud5575422012-09-05 13:44:33 +0800133 int port_num;
Matthew Garrettda0af6e2012-05-11 16:08:27 +0800134
Lan Tianyud5575422012-09-05 13:44:33 +0800135 /*
136 * In the ACPI DSDT table, only usb root hub and usb ports are
137 * acpi device nodes. The hierarchy like following.
138 * Device (EHC1)
139 * Device (HUBN)
140 * Device (PR01)
141 * Device (PR11)
142 * Device (PR12)
143 * Device (PR13)
144 * ...
145 * So all binding process is divided into two parts. binding
146 * root hub and usb ports.
147 */
148 if (is_usb_device(dev)) {
149 udev = to_usb_device(dev);
Lan Tianyu05f91682012-09-05 13:44:34 +0800150 if (udev->parent) {
151 enum usb_port_connect_type type;
152
153 /*
154 * According usb port's connect type to set usb device's
155 * removability.
156 */
157 type = usb_get_hub_port_connect_type(udev->parent,
158 udev->portnum);
159 switch (type) {
160 case USB_PORT_CONNECT_TYPE_HOT_PLUG:
161 udev->removable = USB_DEVICE_REMOVABLE;
162 break;
163 case USB_PORT_CONNECT_TYPE_HARD_WIRED:
164 udev->removable = USB_DEVICE_FIXED;
165 break;
166 default:
167 udev->removable = USB_DEVICE_REMOVABLE_UNKNOWN;
168 break;
169 }
170
Lan Tianyud5575422012-09-05 13:44:33 +0800171 return -ENODEV;
Lan Tianyu05f91682012-09-05 13:44:34 +0800172 }
173
Lan Tianyud5575422012-09-05 13:44:33 +0800174 /* root hub's parent is the usb hcd. */
175 parent_handle = DEVICE_ACPI_HANDLE(dev->parent);
176 *handle = acpi_get_child(parent_handle, udev->portnum);
177 if (!*handle)
178 return -ENODEV;
179 return 0;
180 } else if (is_usb_port(dev)) {
181 sscanf(dev_name(dev), "port%d", &port_num);
182 /* Get the struct usb_device point of port's hub */
183 udev = to_usb_device(dev->parent->parent);
Matthew Garrettda0af6e2012-05-11 16:08:27 +0800184
Lan Tianyud5575422012-09-05 13:44:33 +0800185 /*
186 * The root hub ports' parent is the root hub. The non-root-hub
187 * ports' parent is the parent hub port which the hub is
188 * connected to.
189 */
190 if (!udev->parent) {
191 *handle = acpi_get_child(DEVICE_ACPI_HANDLE(&udev->dev),
192 port_num);
193 if (!*handle)
194 return -ENODEV;
195 } else {
196 parent_handle =
197 usb_get_hub_port_acpi_handle(udev->parent,
198 udev->portnum);
199 if (!parent_handle)
200 return -ENODEV;
Matthew Garrettda0af6e2012-05-11 16:08:27 +0800201
Lan Tianyud5575422012-09-05 13:44:33 +0800202 *handle = acpi_get_child(parent_handle, port_num);
203 if (!*handle)
204 return -ENODEV;
205 }
Lan Tianyu05f91682012-09-05 13:44:34 +0800206 usb_acpi_check_port_connect_type(udev, *handle, port_num);
Lan Tianyud5575422012-09-05 13:44:33 +0800207 } else
Matthew Garrettda0af6e2012-05-11 16:08:27 +0800208 return -ENODEV;
209
Matthew Garrettda0af6e2012-05-11 16:08:27 +0800210 return 0;
211}
212
Rafael J. Wysocki53540092013-03-03 22:35:20 +0100213static bool usb_acpi_bus_match(struct device *dev)
214{
215 return is_usb_device(dev) || is_usb_port(dev);
216}
217
Matthew Garrettda0af6e2012-05-11 16:08:27 +0800218static struct acpi_bus_type usb_acpi_bus = {
Rafael J. Wysocki53540092013-03-03 22:35:20 +0100219 .name = "USB",
220 .match = usb_acpi_bus_match,
Matthew Garrettda0af6e2012-05-11 16:08:27 +0800221 .find_device = usb_acpi_find_device,
222};
223
224int usb_acpi_register(void)
225{
226 return register_acpi_bus_type(&usb_acpi_bus);
227}
228
229void usb_acpi_unregister(void)
230{
231 unregister_acpi_bus_type(&usb_acpi_bus);
232}