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

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * usb hub driver head file
   4 *
   5 * Copyright (C) 1999 Linus Torvalds
   6 * Copyright (C) 1999 Johannes Erdfelt
   7 * Copyright (C) 1999 Gregory P. Smith
   8 * Copyright (C) 2001 Brad Hards (bhards@bigpond.net.au)
   9 * Copyright (C) 2012 Intel Corp (tianyu.lan@intel.com)
  10 *
  11 *  move struct usb_hub to this file.
  12 */
  13
  14#include <linux/usb.h>
  15#include <linux/usb/ch11.h>
  16#include <linux/usb/hcd.h>
  17#include "usb.h"
  18
  19struct usb_hub {
  20        struct device           *intfdev;       /* the "interface" device */
  21        struct usb_device       *hdev;
  22        struct kref             kref;
  23        struct urb              *urb;           /* for interrupt polling pipe */
  24
  25        /* buffer for urb ... with extra space in case of babble */
  26        u8                      (*buffer)[8];
  27        union {
  28                struct usb_hub_status   hub;
  29                struct usb_port_status  port;
  30        }                       *status;        /* buffer for status reports */
  31        struct mutex            status_mutex;   /* for the status buffer */
  32
  33        int                     error;          /* last reported error */
  34        int                     nerrors;        /* track consecutive errors */
  35
  36        unsigned long           event_bits[1];  /* status change bitmask */
  37        unsigned long           change_bits[1]; /* ports with logical connect
  38                                                        status change */
  39        unsigned long           removed_bits[1]; /* ports with a "removed"
  40                                                        device present */
  41        unsigned long           wakeup_bits[1]; /* ports that have signaled
  42                                                        remote wakeup */
  43        unsigned long           power_bits[1]; /* ports that are powered */
  44        unsigned long           child_usage_bits[1]; /* ports powered on for
  45                                                        children */
  46        unsigned long           warm_reset_bits[1]; /* ports requesting warm
  47                                                        reset recovery */
  48#if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
  49#error event_bits[] is too short!
  50#endif
  51
  52        struct usb_hub_descriptor *descriptor;  /* class descriptor */
  53        struct usb_tt           tt;             /* Transaction Translator */
  54
  55        unsigned                mA_per_port;    /* current for each child */
  56#ifdef  CONFIG_PM
  57        unsigned                wakeup_enabled_descendants;
  58#endif
  59
  60        unsigned                limited_power:1;
  61        unsigned                quiescing:1;
  62        unsigned                disconnected:1;
  63        unsigned                in_reset:1;
  64
  65        unsigned                quirk_check_port_auto_suspend:1;
  66
  67        unsigned                has_indicators:1;
  68        u8                      indicator[USB_MAXCHILDREN];
  69        struct delayed_work     leds;
  70        struct delayed_work     init_work;
  71        struct work_struct      events;
  72        spinlock_t              irq_urb_lock;
  73        struct timer_list       irq_urb_retry;
  74        struct usb_port         **ports;
  75};
  76
  77/**
  78 * struct usb port - kernel's representation of a usb port
  79 * @child: usb device attached to the port
  80 * @dev: generic device interface
  81 * @port_owner: port's owner
  82 * @peer: related usb2 and usb3 ports (share the same connector)
  83 * @req: default pm qos request for hubs without port power control
  84 * @connect_type: port's connect type
  85 * @location: opaque representation of platform connector location
  86 * @status_lock: synchronize port_event() vs usb_port_{suspend|resume}
  87 * @portnum: port index num based one
  88 * @is_superspeed cache super-speed status
  89 * @usb3_lpm_u1_permit: whether USB3 U1 LPM is permitted.
  90 * @usb3_lpm_u2_permit: whether USB3 U2 LPM is permitted.
  91 */
  92struct usb_port {
  93        struct usb_device *child;
  94        struct device dev;
  95        struct usb_dev_state *port_owner;
  96        struct usb_port *peer;
  97        struct dev_pm_qos_request *req;
  98        enum usb_port_connect_type connect_type;
  99        usb_port_location_t location;
 100        struct mutex status_lock;
 101        u32 over_current_count;
 102        u8 portnum;
 103        u32 quirks;
 104        unsigned int is_superspeed:1;
 105        unsigned int usb3_lpm_u1_permit:1;
 106        unsigned int usb3_lpm_u2_permit: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 int hub_is_superspeedplus(struct usb_device *hdev)
 140{
 141        return (hdev->descriptor.bDeviceProtocol == USB_HUB_PR_SS &&
 142                le16_to_cpu(hdev->descriptor.bcdUSB) >= 0x0310 &&
 143                hdev->bos->ssp_cap);
 144}
 145
 146static inline unsigned hub_power_on_good_delay(struct usb_hub *hub)
 147{
 148        unsigned delay = hub->descriptor->bPwrOn2PwrGood * 2;
 149
 150        /* Wait at least 100 msec for power to become stable */
 151        return max(delay, 100U);
 152}
 153
 154static inline int hub_port_debounce_be_connected(struct usb_hub *hub,
 155                int port1)
 156{
 157        return hub_port_debounce(hub, port1, true);
 158}
 159
 160static inline int hub_port_debounce_be_stable(struct usb_hub *hub,
 161                int port1)
 162{
 163        return hub_port_debounce(hub, port1, false);
 164}
 165