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     ˆ¿Å„Àt_¾ÄÃ ?÷     // SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (c) 2001-2002 by David Brownell
 */

#ifndef __USB_CORE_HCD_H
#define __USB_CORE_HCD_H

#ifdef __KERNEL__

#include <linux/rwsem.h>
#include <linux/interrupt.h>
#include <linux/idr.h>

#define MAX_TOPO_LEVEL		6

/* This file contains declarations of usbcore internals that are mostly
 * used or exposed by Host Controller Drivers.
 */

/*
 * USB Packet IDs (PIDs)
 */
#define USB_PID_EXT			0xf0	/* USB 2.0 LPM ECN */
#define USB_PID_OUT			0xe1
#define USB_PID_ACK			0xd2
#define USB_PID_DATA0			0xc3
#define USB_PID_PING			0xb4	/* USB 2.0 */
#define USB_PID_SOF			0xa5
#define USB_PID_NYET			0x96	/* USB 2.0 */
#define USB_PID_DATA2			0x87	/* USB 2.0 */
#define USB_PID_SPLIT			0x78	/* USB 2.0 */
#define USB_PID_IN			0x69
#define USB_PID_NAK			0x5a
#define USB_PID_DATA1			0x4b
#define USB_PID_PREAMBLE		0x3c	/* Token mode */
#define USB_PID_ERR			0x3c	/* USB 2.0: handshake mode */
#define USB_PID_SETUP			0x2d
#define USB_PID_STALL			0x1e
#define USB_PID_MDATA			0x0f	/* USB 2.0 */

/*-------------------------------------------------------------------------*/

/*
 * USB Host Controller Driver (usb_hcd) framework
 *
 * Since "struct usb_bus" is so thin, you can't share much code in it.
 * This framework is a layer over that, and should be more shareable.
 */

/*-------------------------------------------------------------------------*/

struct giveback_urb_bh {
	bool running;
	bool high_prio;
	spinlock_t lock;
	struct list_head  head;
	struct work_struct bh;
	struct usb_host_endpoint *completing_ep;
};

enum usb_dev_authorize_policy {
	USB_DEVICE_AUTHORIZE_NONE	= 0,
	USB_DEVICE_AUTHORIZE_ALL	= 1,
	USB_DEVICE_AUTHORIZE_INTERNAL	= 2,
};

struct usb_hcd {

	/*
	 * housekeeping
	 */
	struct usb_bus		self;		/* hcd is-a bus */
	struct kref		kref;		/* reference counter */

	const char		*product_desc;	/* product/vendor string */
	int			speed;		/* Speed for this roothub.
						 * May be different from
						 * hcd->driver->flags & HCD_MASK
						 */
	char			irq_descr[24];	/* driver + bus # */

	struct timer_list	rh_timer;	/* drives root-hub polling */
	struct urb		*status_urb;	/* the current status urb */
#ifdef CONFIG_PM
	struct work_struct	wakeup_work;	/* for remote wakeup */
#endif
	struct work_struct	died_work;	/* for when the device dies */

	/*
	 * hardware info/state
	 */
	const struct hc_driver	*driver;	/* hw-specific hooks */

	/*
	 * OTG and some Host controllers need software interaction with phys;
	 * other external phys should be software-transparent
	 */
	struct usb_phy		*usb_phy;
	struct usb_phy_roothub	*phy_roothub;

	/* Flags that need to be manipulated atomically because they can
	 * change while the host controller is running.  Always use
	 * set_bit() or clear_bit() to change their values.
	 */
	unsigned long		flags;
#define HCD_FLAG_HW_ACCESSIBLE		0	/* at full power */
#define HCD_FLAG_POLL_RH		2	/* poll for rh status? */
#define HCD_FLAG_POLL_PENDING		3	/* status has changed? */
#define HCD_FLAG_WAKEUP_PENDING		4	/* root hub is resuming? */
#define HCD_FLAG_RH_RUNNING		5	/* root hub is running? */
#define HCD_FLAG_DEAD			6	/* controller has died? */
#define HCD_FLAG_INTF_AUTHORIZED	7	/* authorize interfaces? */
#define HCD_FLAG_DEFER_RH_REGISTER	8	/* Defer roothub registration */

	/* The flags can be tested using these macros; they are likely to
	 * be slightly faster than test_bit().
	 */
#define HCD_HW_ACCESSIBLE(hcd)	((hcd)->flags & (1U << HCD_FLAG_HW_ACCESSIBLE))
#define HCD_POLL_RH(hcd)	((hcd)->flags & (1U << HCD_FLAG_POLL_RH))
#define HCD_POLL_PENDING(hcd)	((hcd)->flags & (1U << HCD_FLAG_POLL_PENDING))
#define HCD_WAKEUP_PENDING(hcd)	((hcd)->flags & (1U << HCD_FLAG_WAKEUP_PENDING))
#define HCD_RH_RUNNING(hcd)	((hcd)->flags & (1U << HCD_FLAG_RH_RUNNING))
#define HCD_DEAD(hcd)		((hcd)->flags & (1U << HCD_FLAG_DEAD))
#define HCD_DEFER_RH_REGISTER(hcd) ((hcd)->flags & (1U << HCD_FLAG_DEFER_RH_REGISTER))

	/*
	 * Specifies if interfaces are authoriz