LXR linux/drivers/usb/core/hub.h

   1/*
   2 * usb hub driver head file
   3 *
   4 * Copyright (C) 1999 Linus Torvalds
   5 * Copyright (C) 1999 Johannes Erdfelt
   6 * Copyright (C) 1999 Gregory P. Smith
   7 * Copyright (C) 2001 Brad Hards (bhards@bigpond.net.au)
   8 * Copyright (C) 2012 Intel Corp (tianyu.lan@intel.com)
   9 *
  10 *  move struct usb_hub to this file.
  11 *
  12 * This program is free software; you can redistribute it and/or modify
  13 * it under the terms of the GNU General Public License version 2 as
  14 * published by the Free Software Foundation.
  15 *
  16 * This program is distributed in the hope that it will be useful, but
  17 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  18 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  19 * for more details.
  20 */
  21
  22#include <linux/usb.h>
  23#include <linux/usb/ch11.h>
  24#include <linux/usb/hcd.h>
  25#include "usb.h"
  26
  27struct usb_hub {
  28        struct device           *intfdev;       /* the "interface" device */
  29        struct usb_device       *hdev;
  30        struct kref             kref;
  31        struct urb              *urb;           /* for interrupt polling pipe */
  32
  33        /* buffer for urb ... with extra space in case of babble */
  34        u8                      (*buffer)[8];
  35        union {
  36                struct usb_hub_status   hub;
  37                struct usb_port_status  port;
  38        }                       *status;        /* buffer for status reports */
  39        struct mutex            status_mutex;   /* for the status buffer */
  40
  41        int                     error;          /* last reported error */
  42        int                     nerrors;        /* track consecutive errors */
  43
  44        unsigned long           event_bits[1];  /* status change bitmask */
  45        unsigned long           change_bits[1]; /* ports with logical connect
  46                                                        status change */
  47        unsigned long           removed_bits[1]; /* ports with a "removed"
  48                                                        device present */
  49        unsigned long           wakeup_bits[1]; /* ports that have signaled
  50                                                        remote wakeup */
  51        unsigned long           power_bits[1]; /* ports that are powered */
  52        unsigned long           child_usage_bits[1]; /* ports powered on for
  53                                                        children */
  54        unsigned long           warm_reset_bits[1]; /* ports requesting warm
  55                                                        reset recovery */
  56#if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
  57#error event_bits[] is too short!
  58#endif
  59
  60        struct usb_hub_descriptor *descriptor;  /* class descriptor */
  61        struct usb_tt           tt;             /* Transaction Translator */
  62
  63        unsigned                mA_per_port;    /* current for each child */
  64#ifdef  CONFIG_PM
  65        unsigned                wakeup_enabled_descendants;
  66#endif
  67
  68        unsigned                limited_power:1;
  69        unsigned                quiescing:1;
  70        unsigned                disconnected:1;
  71        unsigned                in_reset:1;
  72
  73        unsigned                quirk_check_port_auto_suspend:1;
  74
  75        unsigned                has_indicators:1;
  76        u8                      indicator[USB_MAXCHILDREN];
  77        struct delayed_work     leds;
  78        struct delayed_work     init_work;
  79        struct work_struct      events;
  80        struct usb_port         **ports;
  81};
  82
  83/**
  84 * struct usb port - kernel's representation of a usb port
  85 * @child: usb device attached to the port
  86 * @dev: generic device interface
  87 * @port_owner: port's owner
  88 * @peer: related usb2 and usb3 ports (share the same connector)
  89 * @req: default pm qos request for hubs without port power control
  90 * @connect_type: port's connect type
  91 * @location: opaque representation of platform connector location
  92 * @status_lock: synchronize port_event() vs usb_port_{suspend|resume}
  93 * @portnum: port index num based one
  94 * @is_superspeed cache super-speed status
  95 */
  96struct usb_port {
  97        struct usb_device *child;
  98        struct device dev;
  99        struct usb_dev_state *port_owner;
 100        struct usb_port *peer;
 101        struct dev_pm_qos_request *req;
 102        enum usb_port_connect_type connect_type;
 103        usb_port_location_t location;
 104        struct mutex status_lock;
 105        u8 portnum;
 106        unsigned int is_superspeed:1;
 107};
 108
 109#define to_usb_port(_dev) \
 110        container_of(_dev, struct usb_port, dev)
 111
 112extern int usb_hub_create_port_device(struct usb_hub *hub,
 113                int port1);
 114extern void usb_hub_remove_port_device(struct usb_hub *hub,
 115                int port1);
 116extern int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub,
 117                int port1, bool set);
 118extern struct usb_hub *usb_hub_to_struct_hub(struct usb_device *hdev);
 119extern int hub_port_debounce(struct usb_hub *hub, int port1,
 120                bool must_be_connected);
 121extern int usb_clear_port_feature(struct usb_device *hdev,
 122                int port1, int feature);
 123
 124static inline bool hub_is_port_power_switchable(struct usb_hub *hub)
 125{
 126        __le16 hcs;
 127
 128        if (!hub)
 129                return false;
 130        hcs = hub->descriptor->wHubCharacteristics;
 131        return (le16_to_cpu(hcs) & HUB_CHAR_LPSM) < HUB_CHAR_NO_LPSM;
 132}
 133
 134static inline int hub_is_superspeed(struct usb_device *hdev)
 135{
 136        return hdev->descriptor.bDeviceProtocol == USB_HUB_PR_SS;
 137}
 138
 139static inline unsigned hub_power_on_good_delay(struct usb_hub *hub)
 140{
 141        unsigned delay = hub->descriptor->bPwrOn2PwrGood * 2;
 142
 143        /* Wait at least 100 msec for power to become stable */
 144        return max(delay, 100U);
 145}
 146
 147static inline int hub_port_debounce_be_connected(struct usb_hub *hub,
 148                int port1)
 149{
 150        return hub_port_debounce(hub, port1, true);
 151}
 152
 153static inline int hub_port_debounce_be_stable(struct usb_hub *hub,
 154                int port1)
 155{
 156        return hub_port_debounce(hub, port1, false);
 157}
 158
 159