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 int usb_hub_create_port_device(struct usb_hub *hub, int port1)
162 struct usb_port *port_dev = NULL;
165 port_dev = kzalloc(sizeof(*port_dev), GFP_KERNEL);
171 hub->ports[port1 - 1] = port_dev;
172 port_dev->portnum = port1;
173 port_dev->power_is_on = true;
174 port_dev->dev.parent = hub->intfdev;
175 port_dev->dev.groups = port_dev_group;
176 port_dev->dev.type = &usb_port_device_type;
177 port_dev->dev.driver = &usb_port_driver;
178 dev_set_name(&port_dev->dev, "%s-port%d", dev_name(&hub->hdev->dev),
180 retval = device_register(&port_dev->dev);
184 pm_runtime_set_active(&port_dev->dev);
187 * Do not enable port runtime pm if the hub does not support
188 * power switching. Also, userspace must have final say of
189 * whether a port is permitted to power-off. Do not enable
190 * runtime pm if we fail to expose pm_qos_no_power_off.
192 if (hub_is_port_power_switchable(hub)
193 && dev_pm_qos_expose_flags(&port_dev->dev,
194 PM_QOS_FLAG_NO_POWER_OFF) == 0)
195 pm_runtime_enable(&port_dev->dev);
197 device_enable_async_suspend(&port_dev->dev);
201 put_device(&port_dev->dev);
206 void usb_hub_remove_port_device(struct usb_hub *hub,
209 device_unregister(&hub->ports[port1 - 1]->dev);