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
  19 struct 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         struct usb_port         **ports;
  73 };
  74
  75 /**
  76  * struct usb port - kernel's representation of a usb port
  77  * @child: usb device attached to the port
  78  * @dev: generic device interface
  79  * @port_owner: port's owner
  80  * @peer: related usb2 and usb3 ports (share the same connector)
  81  * @req: default pm qos request for hubs without port power control
  82  * @connect_type: port's connect type
  83  * @location: opaque representation of platform connector location
  84  * @status_lock: synchronize port_event() vs usb_port_{suspend|resume}
  85  * @portnum: port index num based one
  86  * @is_superspeed cache super-speed status
  87  * @usb3_lpm_u1_permit: whether USB3 U1 LPM is permitted.
  88  * @usb3_lpm_u2_permit: whether USB3 U2 LPM is permitted.
  89  */
  90 struct usb_port {
  91         struct usb_device *child;
  92         struct device dev;
  93         struct usb_dev_state *port_owner;
  94         struct usb_port *peer;
  95         struct dev_pm_qos_request *req;
  96         enum usb_port_connect_type connect_type;
  97         usb_port_location_t location;
  98         struct mutex status_lock;
  99         u8 portnum;
 100         unsigned int is_superspeed:1;
 101         unsigned int usb3_lpm_u1_permit:1;
 102         unsigned int usb3_lpm_u2_permit:1;
 103 };
 104
 105 #define to_usb_port(_dev) \
 106         container_of(_dev, struct usb_port, dev)
 107
 108 extern int usb_hub_create_port_device(struct usb_hub *hub,
 109                 int port1);
 110 extern void usb_hub_remove_port_device(struct usb_hub *hub,
 111                 int port1);
 112 extern int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub,
 113                 int port1, bool set);
 114 extern struct usb_hub *usb_hub_to_struct_hub(struct usb_device *hdev);
 115 extern int hub_port_debounce(struct usb_hub *hub, int port1,
 116                 bool must_be_connected);
 117 extern int usb_clear_port_feature(struct usb_device *hdev,
 118                 int port1, int feature);
 119
 120 static inline bool hub_is_port_power_switchable(struct usb_hub *hub)
 121 {
 122         __le16 hcs;
 123
 124         if (!hub)
 125                 return false;
 126         hcs = hub->descriptor->wHubCharacteristics;
 127         return (le16_to_cpu(hcs) & HUB_CHAR_LPSM) < HUB_CHAR_NO_LPSM;
 128 }
 129
 130 static inline int hub_is_superspeed(struct usb_device *hdev)
 131 {
 132         return hdev->descriptor.bDeviceProtocol == USB_HUB_PR_SS;
 133 }
 134
 135 static inline int hub_is_superspeedplus(struct usb_device *hdev)
 136 {
 137         return (hdev->descriptor.bDeviceProtocol == USB_HUB_PR_SS &&
 138                 le16_to_cpu(hdev->descriptor.bcdUSB) >= 0x0310 &&
 139                 hdev->bos->ssp_cap);
 140 }
 141
 142 static inline unsigned hub_power_on_good_delay(struct usb_hub *hub)
 143 {
 144         unsigned delay = hub->descriptor->bPwrOn2PwrGood * 2;
 145
 146         /* Wait at least 100 msec for power to become stable */
 147         return max(delay, 100U);
 148 }
 149
 150 static inline int hub_port_debounce_be_connected(struct usb_hub *hub,
 151                 int port1)
 152 {
 153         return hub_port_debounce(hub, port1, true);
 154 }
 155
 156 static inline int hub_port_debounce_be_stable(struct usb_hub *hub,
 157                 int port1)
 158 {
 159         return hub_port_debounce(hub, port1, false);
 160 }