Commit | Line | Data |
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6e30d7cb LT |
1 | /* |
2 | * usb port device code | |
3 | * | |
4 | * Copyright (C) 2012 Intel Corp | |
5 | * | |
6 | * Author: Lan Tianyu <tianyu.lan@intel.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
14 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | * for more details. | |
16 | * | |
17 | */ | |
18 | ||
9f7344fb | 19 | #include <linux/slab.h> |
971fcd49 | 20 | #include <linux/pm_qos.h> |
9f7344fb | 21 | |
6e30d7cb LT |
22 | #include "hub.h" |
23 | ||
cef7468c LT |
24 | static const struct attribute_group *port_dev_group[]; |
25 | ||
d03f254f GKH |
26 | static ssize_t connect_type_show(struct device *dev, |
27 | struct device_attribute *attr, char *buf) | |
cef7468c LT |
28 | { |
29 | struct usb_port *port_dev = to_usb_port(dev); | |
30 | char *result; | |
31 | ||
32 | switch (port_dev->connect_type) { | |
33 | case USB_PORT_CONNECT_TYPE_HOT_PLUG: | |
34 | result = "hotplug"; | |
35 | break; | |
36 | case USB_PORT_CONNECT_TYPE_HARD_WIRED: | |
37 | result = "hardwired"; | |
38 | break; | |
39 | case USB_PORT_NOT_USED: | |
40 | result = "not used"; | |
41 | break; | |
42 | default: | |
43 | result = "unknown"; | |
44 | break; | |
45 | } | |
46 | ||
47 | return sprintf(buf, "%s\n", result); | |
48 | } | |
d03f254f | 49 | static DEVICE_ATTR_RO(connect_type); |
cef7468c LT |
50 | |
51 | static struct attribute *port_dev_attrs[] = { | |
52 | &dev_attr_connect_type.attr, | |
53 | NULL, | |
54 | }; | |
55 | ||
56 | static struct attribute_group port_dev_attr_grp = { | |
57 | .attrs = port_dev_attrs, | |
58 | }; | |
59 | ||
60 | static const struct attribute_group *port_dev_group[] = { | |
61 | &port_dev_attr_grp, | |
62 | NULL, | |
63 | }; | |
64 | ||
6e30d7cb LT |
65 | static void usb_port_device_release(struct device *dev) |
66 | { | |
67 | struct usb_port *port_dev = to_usb_port(dev); | |
68 | ||
69 | kfree(port_dev); | |
70 | } | |
71 | ||
84ebc102 | 72 | #ifdef CONFIG_PM_RUNTIME |
971fcd49 LT |
73 | static int usb_port_runtime_resume(struct device *dev) |
74 | { | |
75 | struct usb_port *port_dev = to_usb_port(dev); | |
76 | struct usb_device *hdev = to_usb_device(dev->parent->parent); | |
77 | struct usb_interface *intf = to_usb_interface(dev->parent); | |
ad493e5e LT |
78 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
79 | int port1 = port_dev->portnum; | |
971fcd49 LT |
80 | int retval; |
81 | ||
ad493e5e LT |
82 | if (!hub) |
83 | return -EINVAL; | |
600856c2 AS |
84 | if (hub->in_reset) { |
85 | port_dev->power_is_on = 1; | |
86 | return 0; | |
87 | } | |
ad493e5e | 88 | |
971fcd49 | 89 | usb_autopm_get_interface(intf); |
ad493e5e LT |
90 | set_bit(port1, hub->busy_bits); |
91 | ||
41341261 | 92 | retval = usb_hub_set_port_power(hdev, hub, port1, true); |
ad493e5e LT |
93 | if (port_dev->child && !retval) { |
94 | /* | |
d49dad3e SS |
95 | * Attempt to wait for usb hub port to be reconnected in order |
96 | * to make the resume procedure successful. The device may have | |
97 | * disconnected while the port was powered off, so ignore the | |
98 | * return status. | |
ad493e5e LT |
99 | */ |
100 | retval = hub_port_debounce_be_connected(hub, port1); | |
d49dad3e | 101 | if (retval < 0) |
ad493e5e LT |
102 | dev_dbg(&port_dev->dev, "can't get reconnection after setting port power on, status %d\n", |
103 | retval); | |
ad493e5e | 104 | usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE); |
ad493e5e LT |
105 | retval = 0; |
106 | } | |
107 | ||
ad493e5e | 108 | clear_bit(port1, hub->busy_bits); |
971fcd49 LT |
109 | usb_autopm_put_interface(intf); |
110 | return retval; | |
111 | } | |
112 | ||
113 | static int usb_port_runtime_suspend(struct device *dev) | |
114 | { | |
115 | struct usb_port *port_dev = to_usb_port(dev); | |
116 | struct usb_device *hdev = to_usb_device(dev->parent->parent); | |
117 | struct usb_interface *intf = to_usb_interface(dev->parent); | |
ad493e5e LT |
118 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
119 | int port1 = port_dev->portnum; | |
971fcd49 LT |
120 | int retval; |
121 | ||
ad493e5e LT |
122 | if (!hub) |
123 | return -EINVAL; | |
600856c2 AS |
124 | if (hub->in_reset) |
125 | return -EBUSY; | |
ad493e5e | 126 | |
971fcd49 LT |
127 | if (dev_pm_qos_flags(&port_dev->dev, PM_QOS_FLAG_NO_POWER_OFF) |
128 | == PM_QOS_FLAGS_ALL) | |
129 | return -EAGAIN; | |
130 | ||
131 | usb_autopm_get_interface(intf); | |
ad493e5e | 132 | set_bit(port1, hub->busy_bits); |
41341261 | 133 | retval = usb_hub_set_port_power(hdev, hub, port1, false); |
ad493e5e LT |
134 | usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_CONNECTION); |
135 | usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE); | |
136 | clear_bit(port1, hub->busy_bits); | |
971fcd49 LT |
137 | usb_autopm_put_interface(intf); |
138 | return retval; | |
139 | } | |
140 | #endif | |
141 | ||
142 | static const struct dev_pm_ops usb_port_pm_ops = { | |
84ebc102 | 143 | #ifdef CONFIG_PM_RUNTIME |
971fcd49 LT |
144 | .runtime_suspend = usb_port_runtime_suspend, |
145 | .runtime_resume = usb_port_runtime_resume, | |
971fcd49 LT |
146 | #endif |
147 | }; | |
148 | ||
6e30d7cb LT |
149 | struct device_type usb_port_device_type = { |
150 | .name = "usb_port", | |
151 | .release = usb_port_device_release, | |
971fcd49 | 152 | .pm = &usb_port_pm_ops, |
6e30d7cb LT |
153 | }; |
154 | ||
d99f6b41 DW |
155 | static struct device_driver usb_port_driver = { |
156 | .name = "usb", | |
157 | .owner = THIS_MODULE, | |
158 | }; | |
159 | ||
d8521afe DW |
160 | static void link_peers(struct usb_port *left, struct usb_port *right) |
161 | { | |
162 | if (left->peer == right && right->peer == left) | |
163 | return; | |
164 | ||
165 | if (left->peer || right->peer) { | |
166 | struct usb_port *lpeer = left->peer; | |
167 | struct usb_port *rpeer = right->peer; | |
168 | ||
169 | WARN(1, "failed to peer %s and %s (%s -> %p) (%s -> %p)\n", | |
170 | dev_name(&left->dev), dev_name(&right->dev), | |
171 | dev_name(&left->dev), lpeer, | |
172 | dev_name(&right->dev), rpeer); | |
173 | return; | |
174 | } | |
175 | ||
176 | left->peer = right; | |
177 | right->peer = left; | |
178 | } | |
179 | ||
180 | static void unlink_peers(struct usb_port *left, struct usb_port *right) | |
181 | { | |
182 | WARN(right->peer != left || left->peer != right, | |
183 | "%s and %s are not peers?\n", | |
184 | dev_name(&left->dev), dev_name(&right->dev)); | |
185 | ||
186 | right->peer = NULL; | |
187 | left->peer = NULL; | |
188 | } | |
189 | ||
8b1ba80c DW |
190 | /* |
191 | * Set the default peer port for root hubs, or via the upstream peer | |
192 | * relationship for all other hubs | |
193 | */ | |
d8521afe DW |
194 | static void find_and_link_peer(struct usb_hub *hub, int port1) |
195 | { | |
196 | struct usb_port *port_dev = hub->ports[port1 - 1], *peer; | |
197 | struct usb_device *hdev = hub->hdev; | |
8b1ba80c DW |
198 | struct usb_device *peer_hdev; |
199 | struct usb_hub *peer_hub; | |
d8521afe DW |
200 | |
201 | if (!hdev->parent) { | |
d8521afe DW |
202 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
203 | struct usb_hcd *peer_hcd = hcd->shared_hcd; | |
204 | ||
205 | if (!peer_hcd) | |
206 | return; | |
207 | ||
208 | peer_hdev = peer_hcd->self.root_hub; | |
8b1ba80c DW |
209 | } else { |
210 | struct usb_port *upstream; | |
211 | struct usb_device *parent = hdev->parent; | |
212 | struct usb_hub *parent_hub = usb_hub_to_struct_hub(parent); | |
213 | ||
214 | if (!parent_hub) | |
d8521afe DW |
215 | return; |
216 | ||
8b1ba80c DW |
217 | upstream = parent_hub->ports[hdev->portnum - 1]; |
218 | if (!upstream || !upstream->peer) | |
219 | return; | |
d8521afe | 220 | |
8b1ba80c | 221 | peer_hdev = upstream->peer->child; |
d8521afe | 222 | } |
8b1ba80c DW |
223 | |
224 | peer_hub = usb_hub_to_struct_hub(peer_hdev); | |
225 | if (!peer_hub || port1 > peer_hdev->maxchild) | |
226 | return; | |
227 | ||
228 | peer = peer_hub->ports[port1 - 1]; | |
229 | if (peer) | |
230 | link_peers(port_dev, peer); | |
d8521afe DW |
231 | } |
232 | ||
6e30d7cb LT |
233 | int usb_hub_create_port_device(struct usb_hub *hub, int port1) |
234 | { | |
d8521afe | 235 | struct usb_port *port_dev; |
6e30d7cb LT |
236 | int retval; |
237 | ||
238 | port_dev = kzalloc(sizeof(*port_dev), GFP_KERNEL); | |
239 | if (!port_dev) { | |
240 | retval = -ENOMEM; | |
241 | goto exit; | |
242 | } | |
243 | ||
244 | hub->ports[port1 - 1] = port_dev; | |
971fcd49 | 245 | port_dev->portnum = port1; |
ad493e5e | 246 | port_dev->power_is_on = true; |
6e30d7cb | 247 | port_dev->dev.parent = hub->intfdev; |
cef7468c | 248 | port_dev->dev.groups = port_dev_group; |
6e30d7cb | 249 | port_dev->dev.type = &usb_port_device_type; |
d99f6b41 DW |
250 | port_dev->dev.driver = &usb_port_driver; |
251 | dev_set_name(&port_dev->dev, "%s-port%d", dev_name(&hub->hdev->dev), | |
252 | port1); | |
6e30d7cb LT |
253 | retval = device_register(&port_dev->dev); |
254 | if (retval) | |
255 | goto error_register; | |
256 | ||
d8521afe DW |
257 | find_and_link_peer(hub, port1); |
258 | ||
971fcd49 | 259 | pm_runtime_set_active(&port_dev->dev); |
f6cced1a | 260 | |
9262c19d DW |
261 | /* |
262 | * Do not enable port runtime pm if the hub does not support | |
263 | * power switching. Also, userspace must have final say of | |
264 | * whether a port is permitted to power-off. Do not enable | |
265 | * runtime pm if we fail to expose pm_qos_no_power_off. | |
f6cced1a | 266 | */ |
9262c19d DW |
267 | if (hub_is_port_power_switchable(hub) |
268 | && dev_pm_qos_expose_flags(&port_dev->dev, | |
269 | PM_QOS_FLAG_NO_POWER_OFF) == 0) | |
f6cced1a LT |
270 | pm_runtime_enable(&port_dev->dev); |
271 | ||
192fef18 | 272 | device_enable_async_suspend(&port_dev->dev); |
6e30d7cb LT |
273 | return 0; |
274 | ||
275 | error_register: | |
276 | put_device(&port_dev->dev); | |
277 | exit: | |
278 | return retval; | |
279 | } | |
280 | ||
d8521afe | 281 | void usb_hub_remove_port_device(struct usb_hub *hub, int port1) |
6e30d7cb | 282 | { |
d8521afe DW |
283 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
284 | struct usb_port *peer; | |
6e30d7cb | 285 | |
d8521afe DW |
286 | peer = port_dev->peer; |
287 | if (peer) | |
288 | unlink_peers(port_dev, peer); | |
289 | device_unregister(&port_dev->dev); | |
290 | } |