drivers/usb/usbip/vhci.h

   1 /*
   2  * Copyright (C) 2003-2008 Takahiro Hirofuchi
   3  * Copyright (C) 2015 Nobuo Iwata
   4  *
   5  * This is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  */
  11
  12 #ifndef __USBIP_VHCI_H
  13 #define __USBIP_VHCI_H
  14
  15 #include <linux/device.h>
  16 #include <linux/list.h>
  17 #include <linux/spinlock.h>
  18 #include <linux/sysfs.h>
  19 #include <linux/types.h>
  20 #include <linux/usb.h>
  21 #include <linux/usb/hcd.h>
  22 #include <linux/wait.h>
  23
  24 struct vhci_device {
  25         struct usb_device *udev;
  26
  27         /*
  28          * devid specifies a remote usb device uniquely instead
  29          * of combination of busnum and devnum.
  30          */
  31         __u32 devid;
  32
  33         /* speed of a remote device */
  34         enum usb_device_speed speed;
  35
  36         /* vhci root-hub port to which this device is attached */
  37         __u32 rhport;
  38
  39         struct usbip_device ud;
  40
  41         /* lock for the below link lists */
  42         spinlock_t priv_lock;
  43
  44         /* vhci_priv is linked to one of them. */
  45         struct list_head priv_tx;
  46         struct list_head priv_rx;
  47
  48         /* vhci_unlink is linked to one of them */
  49         struct list_head unlink_tx;
  50         struct list_head unlink_rx;
  51
  52         /* vhci_tx thread sleeps for this queue */
  53         wait_queue_head_t waitq_tx;
  54 };
  55
  56 /* urb->hcpriv, use container_of() */
  57 struct vhci_priv {
  58         unsigned long seqnum;
  59         struct list_head list;
  60
  61         struct vhci_device *vdev;
  62         struct urb *urb;
  63 };
  64
  65 struct vhci_unlink {
  66         /* seqnum of this request */
  67         unsigned long seqnum;
  68
  69         struct list_head list;
  70
  71         /* seqnum of the unlink target */
  72         unsigned long unlink_seqnum;
  73 };
  74
  75 /* Number of supported ports. Value has an upperbound of USB_MAXCHILDREN */
  76 #ifdef CONFIG_USBIP_VHCI_HC_PORTS
  77 #define VHCI_HC_PORTS CONFIG_USBIP_VHCI_HC_PORTS
  78 #else
  79 #define VHCI_HC_PORTS 8
  80 #endif
  81
  82 #ifdef CONFIG_USBIP_VHCI_NR_HCS
  83 #define VHCI_NR_HCS CONFIG_USBIP_VHCI_NR_HCS
  84 #else
  85 #define VHCI_NR_HCS 1
  86 #endif
  87
  88 #define MAX_STATUS_NAME 16
  89
  90 /* for usb_bus.hcpriv */
  91 struct vhci_hcd {
  92         spinlock_t lock;
  93
  94         u32 port_status[VHCI_HC_PORTS];
  95
  96         unsigned resuming:1;
  97         unsigned long re_timeout;
  98
  99         atomic_t seqnum;
 100
 101         /*
 102          * NOTE:
 103          * wIndex shows the port number and begins from 1.
 104          * But, the index of this array begins from 0.
 105          */
 106         struct vhci_device vdev[VHCI_HC_PORTS];
 107 };
 108
 109 extern int vhci_num_controllers;
 110 extern struct platform_device **vhci_pdevs;
 111 extern struct attribute_group vhci_attr_group;
 112
 113 /* vhci_hcd.c */
 114 void rh_port_connect(struct vhci_device *vdev, enum usb_device_speed speed);
 115
 116 /* vhci_sysfs.c */
 117 int vhci_init_attr_group(void);
 118 void vhci_finish_attr_group(void);
 119
 120 /* vhci_rx.c */
 121 struct urb *pickup_urb_and_free_priv(struct vhci_device *vdev, __u32 seqnum);
 122 int vhci_rx_loop(void *data);
 123
 124 /* vhci_tx.c */
 125 int vhci_tx_loop(void *data);
 126
 127 static inline __u32 port_to_rhport(__u32 port)
 128 {
 129         return port % VHCI_HC_PORTS;
 130 }
 131
 132 static inline int port_to_pdev_nr(__u32 port)
 133 {
 134         return port / VHCI_HC_PORTS;
 135 }
 136
 137 static inline struct vhci_hcd *hcd_to_vhci(struct usb_hcd *hcd)
 138 {
 139         return (struct vhci_hcd *) (hcd->hcd_priv);
 140 }
 141
 142 static inline struct device *hcd_dev(struct usb_hcd *hcd)
 143 {
 144         return (hcd)->self.controller;
 145 }
 146
 147 static inline const char *hcd_name(struct usb_hcd *hcd)
 148 {
 149         return (hcd)->self.bus_name;
 150 }
 151
 152 static inline struct usb_hcd *vhci_to_hcd(struct vhci_hcd *vhci)
 153 {
 154         return container_of((void *) vhci, struct usb_hcd, hcd_priv);
 155 }
 156
 157 static inline struct vhci_hcd *vdev_to_vhci(struct vhci_device *vdev)
 158 {
 159         return container_of(
 160                         (void *)(vdev - vdev->rhport), struct vhci_hcd, vdev);
 161 }
 162
 163 #endif /* __USBIP_VHCI_H */