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/* SPDX-License-Identifier: GPL-2.0 */
* usb hub driver head file
* Copyright (C) 1999 Linus Torvalds
* Copyright (C) 1999 Johannes Erdfelt
* Copyright (C) 1999 Gregory P. Smith
* Copyright (C) 2001 Brad Hards (
* Copyright (C) 2012 Intel Corp (
* move struct usb_hub to this file.
#include <linux/usb.h>
#include <linux/usb/ch11.h>
#include <linux/usb/hcd.h>
#include "usb.h"
struct usb_hub {
struct device *intfdev; /* the "interface" device */
struct usb_device *hdev;
struct kref kref;
struct urb *urb; /* for interrupt polling pipe */
/* buffer for urb ... with extra space in case of babble */
u8 (*buffer)[8];
union {
struct usb_hub_status hub;
struct usb_port_status port;
} *status; /* buffer for status reports */
struct mutex status_mutex; /* for the status buffer */
int error; /* last reported error */
int nerrors; /* track consecutive errors */
unsigned long event_bits[1]; /* status change bitmask */
unsigned long change_bits[1]; /* ports with logical connect
status change */
unsigned long removed_bits[1]; /* ports with a "removed"
device present */
unsigned long wakeup_bits[1]; /* ports that have signaled
remote wakeup */
unsigned long power_bits[1]; /* ports that are powered */
unsigned long child_usage_bits[1]; /* ports powered on for
children */
unsigned long warm_reset_bits[1]; /* ports requesting warm
reset recovery */
#if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
#error event_bits[] is too short!
struct usb_hub_descriptor *descriptor; /* class descriptor */
struct usb_tt tt; /* Transaction Translator */
unsigned mA_per_port; /* current for each child */
#ifdef CONFIG_PM
unsigned wakeup_enabled_descendants;
unsigned limited_power:1;
unsigned quiescing:1;
unsigned disconnected:1;
unsigned in_reset:1;
unsigned quirk_disable_autosuspend:1;
unsigned quirk_check_port_auto_suspend:1;
unsigned has_indicators:1;
u8 indicator[USB_MAXCHILDREN];
struct delayed_work leds;
struct delayed_work init_work;
struct work_struct events;
spinlock_t irq_urb_lock;
struct timer_list irq_urb_retry;
struct usb_port **ports;
* struct usb port - kernel's representation of a usb port
* @child: usb device attached to the port
* @dev: generic device interface
* @port_owner: port's owner
* @peer: related usb2 and usb3 ports (share the same connector)
* @req: default pm qos request for hubs without port power control
* @connect_type: port's connect type
* @location: opaque representation of platform connector location
* @status_lock: synchronize port_event() vs usb_port_{suspend|resume}
* @portnum: port index num based one
* @is_superspeed cache super-speed status
* @usb3_lpm_u1_permit: whether USB3 U1 LPM is permitted.
* @usb3_lpm_u2_permit: whether USB3 U2 LPM is permitted.
struct usb_port {
struct usb_device *child;
struct device dev;
struct usb_dev_state *port_owner;
struct usb_port *peer;
struct dev_pm_qos_request *req;
enum usb_port_connect_type connect_type;
usb_port_location_t location;
struct mutex status_lock;
u32 over_current_count;
u8 portnum;
u32 quirks;
unsigned int is_superspeed:1;
unsigned int usb3_lpm_u1_permit:1;
unsigned int usb3_lpm_u2_permit:1;
#define to_usb_port(_dev) \
container_of(_dev, struct usb_port, dev)
extern int usb_hub_create_port_device(struct usb_hub *hub,
int port1);
extern void usb_hub_remove_port_device(struct usb_hub *hub,
int port1);
extern int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub,
int port1, bool set);
extern struct usb_hub *usb_hub_to_struct_hub(struct usb_device *hdev);
extern int hub_port_debounce(struct usb_hub *hub, int port1,
bool must_be_connected);
extern int usb_clear_port_feature(struct usb_device *hdev,
int port1, int feature);
static inline bool hub_is_port_power_switchable(struct usb_hub *hub)
__le16 hcs;
if (!hub)
return false;
hcs = hub->descriptor->wHubCharacteristics;
return (le16_to_cpu(hcs) & HUB_CHAR_LPSM) < HUB_CHAR_NO_LPSM;
static inline int hub_is_superspeed(struct usb_device *hdev)
return hdev->descriptor.bDeviceProtocol == USB_HUB_PR_SS;
static inline int hub_is_superspeedplus(struct usb_device *hdev)
return (hdev->descriptor.bDeviceProtocol == USB_HUB_PR_SS &&
le16_to_cpu(hdev->descriptor.bcdUSB) >= 0x0310 &&
static inline unsigned hub_power_on_good_delay(struct usb_hub *hub)
unsigned delay = hub->descriptor->bPwrOn2PwrGood * 2;
/* Wait at least 100 msec for power to become stable */
return max(delay, 100U);
static inline int hub_port_debounce_be_connected(struct usb_hub *hub,
int port1)
return hub_port_debounce(hub, port1, true);
static inline int hub_port_debounce_be_stable(struct usb_hub *hub,
int port1)
return hub_port_debounce(hub, port1, false);