4 * Copyright (C) 2012 Intel Corp
6 * Author: Lan Tianyu <tianyu.lan@intel.com>
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.
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
19 #include <linux/slab.h>
20 #include <linux/pm_qos.h>
24 static const struct attribute_group *port_dev_group[];
26 static ssize_t connect_type_show(struct device *dev,
27 struct device_attribute *attr, char *buf)
29 struct usb_port *port_dev = to_usb_port(dev);
32 switch (port_dev->connect_type) {
33 case USB_PORT_CONNECT_TYPE_HOT_PLUG:
36 case USB_PORT_CONNECT_TYPE_HARD_WIRED:
39 case USB_PORT_NOT_USED:
47 return sprintf(buf, "%s\n", result);
49 static DEVICE_ATTR_RO(connect_type);
51 static struct attribute *port_dev_attrs[] = {
52 &dev_attr_connect_type.attr,
56 static struct attribute_group port_dev_attr_grp = {
57 .attrs = port_dev_attrs,
60 static const struct attribute_group *port_dev_group[] = {
65 static void usb_port_device_release(struct device *dev)
67 struct usb_port *port_dev = to_usb_port(dev);
72 #ifdef CONFIG_PM_RUNTIME
73 static int usb_port_runtime_resume(struct device *dev)
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);
78 struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
79 int port1 = port_dev->portnum;
85 port_dev->power_is_on = 1;
89 usb_autopm_get_interface(intf);
90 set_bit(port1, hub->busy_bits);
92 retval = usb_hub_set_port_power(hdev, hub, port1, true);
93 if (port_dev->child && !retval) {
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
100 retval = hub_port_debounce_be_connected(hub, port1);
102 dev_dbg(&port_dev->dev, "can't get reconnection after setting port power on, status %d\n",
104 usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE);
108 clear_bit(port1, hub->busy_bits);
109 usb_autopm_put_interface(intf);
113 static int usb_port_runtime_suspend(struct device *dev)
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);
118 struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
119 int port1 = port_dev->portnum;
127 if (dev_pm_qos_flags(&port_dev->dev, PM_QOS_FLAG_NO_POWER_OFF)
131 usb_autopm_get_interface(intf);
132 set_bit(port1, hub->busy_bits);
133 retval = usb_hub_set_port_power(hdev, hub, port1, false);
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);
137 usb_autopm_put_interface(intf);
142 static const struct dev_pm_ops usb_port_pm_ops = {
143 #ifdef CONFIG_PM_RUNTIME
144 .runtime_suspend = usb_port_runtime_suspend,
145 .runtime_resume = usb_port_runtime_resume,
149 struct device_type usb_port_device_type = {
151 .release = usb_port_device_release,
152 .pm = &usb_port_pm_ops,
155 static struct device_driver usb_port_driver = {
157 .owner = THIS_MODULE,
160 static void link_peers(struct usb_port *left, struct usb_port *right)
162 if (left->peer == right && right->peer == left)
165 if (left->peer || right->peer) {
166 struct usb_port *lpeer = left->peer;
167 struct usb_port *rpeer = right->peer;
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);
180 static void unlink_peers(struct usb_port *left, struct usb_port *right)
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));
191 * For each usb hub device in the system check to see if it is in the
192 * peer domain of the given port_dev, and if it is check to see if it
193 * has a port that matches the given port by location
195 static int match_location(struct usb_device *peer_hdev, void *p)
198 struct usb_hcd *hcd, *peer_hcd;
199 struct usb_port *port_dev = p, *peer;
200 struct usb_hub *peer_hub = usb_hub_to_struct_hub(peer_hdev);
201 struct usb_device *hdev = to_usb_device(port_dev->dev.parent->parent);
206 hcd = bus_to_hcd(hdev->bus);
207 peer_hcd = bus_to_hcd(peer_hdev->bus);
208 /* peer_hcd is provisional until we verify it against the known peer */
209 if (peer_hcd != hcd->shared_hcd)
212 for (port1 = 1; port1 <= peer_hdev->maxchild; port1++) {
213 peer = peer_hub->ports[port1 - 1];
214 if (peer && peer->location == port_dev->location) {
215 link_peers(port_dev, peer);
224 * Find the peer port either via explicit platform firmware "location"
225 * data, the peer hcd for root hubs, or the upstream peer relationship
226 * for all other hubs.
228 static void find_and_link_peer(struct usb_hub *hub, int port1)
230 struct usb_port *port_dev = hub->ports[port1 - 1], *peer;
231 struct usb_device *hdev = hub->hdev;
232 struct usb_device *peer_hdev;
233 struct usb_hub *peer_hub;
236 * If location data is available then we can only peer this port
237 * by a location match, not the default peer (lest we create a
238 * situation where we need to go back and undo a default peering
239 * when the port is later peered by location data)
241 if (port_dev->location) {
242 /* we link the peer in match_location() if found */
243 usb_for_each_dev(port_dev, match_location);
245 } else if (!hdev->parent) {
246 struct usb_hcd *hcd = bus_to_hcd(hdev->bus);
247 struct usb_hcd *peer_hcd = hcd->shared_hcd;
252 peer_hdev = peer_hcd->self.root_hub;
254 struct usb_port *upstream;
255 struct usb_device *parent = hdev->parent;
256 struct usb_hub *parent_hub = usb_hub_to_struct_hub(parent);
261 upstream = parent_hub->ports[hdev->portnum - 1];
262 if (!upstream || !upstream->peer)
265 peer_hdev = upstream->peer->child;
268 peer_hub = usb_hub_to_struct_hub(peer_hdev);
269 if (!peer_hub || port1 > peer_hdev->maxchild)
273 * we found a valid default peer, last check is to make sure it
274 * does not have location data
276 peer = peer_hub->ports[port1 - 1];
277 if (peer && peer->location == 0)
278 link_peers(port_dev, peer);
281 int usb_hub_create_port_device(struct usb_hub *hub, int port1)
283 struct usb_port *port_dev;
286 port_dev = kzalloc(sizeof(*port_dev), GFP_KERNEL);
292 hub->ports[port1 - 1] = port_dev;
293 port_dev->portnum = port1;
294 port_dev->power_is_on = true;
295 port_dev->dev.parent = hub->intfdev;
296 port_dev->dev.groups = port_dev_group;
297 port_dev->dev.type = &usb_port_device_type;
298 port_dev->dev.driver = &usb_port_driver;
299 dev_set_name(&port_dev->dev, "%s-port%d", dev_name(&hub->hdev->dev),
301 retval = device_register(&port_dev->dev);
305 find_and_link_peer(hub, port1);
307 pm_runtime_set_active(&port_dev->dev);
310 * Do not enable port runtime pm if the hub does not support
311 * power switching. Also, userspace must have final say of
312 * whether a port is permitted to power-off. Do not enable
313 * runtime pm if we fail to expose pm_qos_no_power_off.
315 if (hub_is_port_power_switchable(hub)
316 && dev_pm_qos_expose_flags(&port_dev->dev,
317 PM_QOS_FLAG_NO_POWER_OFF) == 0)
318 pm_runtime_enable(&port_dev->dev);
320 device_enable_async_suspend(&port_dev->dev);
324 put_device(&port_dev->dev);
329 void usb_hub_remove_port_device(struct usb_hub *hub, int port1)
331 struct usb_port *port_dev = hub->ports[port1 - 1];
332 struct usb_port *peer;
334 peer = port_dev->peer;
336 unlink_peers(port_dev, peer);
337 device_unregister(&port_dev->dev);