drivers/usb/core/port.c

   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
  19 #include <linux/slab.h>
  20 #include <linux/pm_qos.h>
  21
  22 #include "hub.h"
  23
  24 static const struct attribute_group *port_dev_group[];
  25
  26 static ssize_t show_port_connect_type(struct device *dev,
  27         struct device_attribute *attr, char *buf)
  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 }
  49 static DEVICE_ATTR(connect_type, S_IRUGO, show_port_connect_type,
  50                 NULL);
  51
  52 static struct attribute *port_dev_attrs[] = {
  53         &dev_attr_connect_type.attr,
  54         NULL,
  55 };
  56
  57 static struct attribute_group port_dev_attr_grp = {
  58         .attrs = port_dev_attrs,
  59 };
  60
  61 static const struct attribute_group *port_dev_group[] = {
  62         &port_dev_attr_grp,
  63         NULL,
  64 };
  65
  66 static void usb_port_device_release(struct device *dev)
  67 {
  68         struct usb_port *port_dev = to_usb_port(dev);
  69
  70         usb_acpi_unregister_power_resources(dev);
  71         kfree(port_dev);
  72 }
  73
  74 #ifdef CONFIG_USB_SUSPEND
  75 static int usb_port_runtime_resume(struct device *dev)
  76 {
  77         struct usb_port *port_dev = to_usb_port(dev);
  78         struct usb_device *hdev = to_usb_device(dev->parent->parent);
  79         struct usb_interface *intf = to_usb_interface(dev->parent);
  80         int retval;
  81
  82         usb_autopm_get_interface(intf);
  83         retval = usb_hub_set_port_power(hdev, port_dev->portnum, true);
  84         usb_autopm_put_interface(intf);
  85         return retval;
  86 }
  87
  88 static int usb_port_runtime_suspend(struct device *dev)
  89 {
  90         struct usb_port *port_dev = to_usb_port(dev);
  91         struct usb_device *hdev = to_usb_device(dev->parent->parent);
  92         struct usb_interface *intf = to_usb_interface(dev->parent);
  93         int retval;
  94
  95         if (dev_pm_qos_flags(&port_dev->dev, PM_QOS_FLAG_NO_POWER_OFF)
  96                         == PM_QOS_FLAGS_ALL)
  97                 return -EAGAIN;
  98
  99         usb_autopm_get_interface(intf);
 100         retval = usb_hub_set_port_power(hdev, port_dev->portnum, false);
 101         usb_autopm_put_interface(intf);
 102         return retval;
 103 }
 104 #endif
 105
 106 static const struct dev_pm_ops usb_port_pm_ops = {
 107 #ifdef CONFIG_USB_SUSPEND
 108         .runtime_suspend =      usb_port_runtime_suspend,
 109         .runtime_resume =       usb_port_runtime_resume,
 110         .runtime_idle =         pm_generic_runtime_idle,
 111 #endif
 112 };
 113
 114 struct device_type usb_port_device_type = {
 115         .name =         "usb_port",
 116         .release =      usb_port_device_release,
 117         .pm =           &usb_port_pm_ops,
 118 };
 119
 120 int usb_hub_create_port_device(struct usb_hub *hub, int port1)
 121 {
 122         struct usb_port *port_dev = NULL;
 123         int retval;
 124
 125         port_dev = kzalloc(sizeof(*port_dev), GFP_KERNEL);
 126         if (!port_dev) {
 127                 retval = -ENOMEM;
 128                 goto exit;
 129         }
 130
 131         hub->ports[port1 - 1] = port_dev;
 132         port_dev->portnum = port1;
 133         port_dev->dev.parent = hub->intfdev;
 134         port_dev->dev.groups = port_dev_group;
 135         port_dev->dev.type = &usb_port_device_type;
 136         dev_set_name(&port_dev->dev, "port%d", port1);
 137
 138         retval = device_register(&port_dev->dev);
 139         if (retval)
 140                 goto error_register;
 141
 142         pm_runtime_set_active(&port_dev->dev);
 143         pm_runtime_enable(&port_dev->dev);
 144
 145         retval = usb_acpi_register_power_resources(&port_dev->dev);
 146         if (retval && retval != -ENODEV)
 147                 dev_warn(&port_dev->dev, "the port can't register its ACPI power resource.\n");
 148
 149         return 0;
 150
 151 error_register:
 152         put_device(&port_dev->dev);
 153 exit:
 154         return retval;
 155 }
 156
 157 void usb_hub_remove_port_device(struct usb_hub *hub,
 158                                        int port1)
 159 {
 160         device_unregister(&hub->ports[port1 - 1]->dev);
 161 }
 162