linux/drivers/usb/host/ehci-hub.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2001-2004 by David Brownell
 */

/* this file is part of ehci-hcd.c */

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

/*
 * EHCI Root Hub ... the nonsharable stuff
 *
 * Registers don't need cpu_to_le32, that happens transparently
 */

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

#define PORT_WAKE_BITS …

#ifdef	CONFIG_PM

static void unlink_empty_async_suspended(struct ehci_hcd *ehci);

static int persist_enabled_on_companion(struct usb_device *udev, void *unused)
{ … }

/* After a power loss, ports that were owned by the companion must be
 * reset so that the companion can still own them.
 */
static void ehci_handover_companion_ports(struct ehci_hcd *ehci)
{ … }

static int ehci_port_change(struct ehci_hcd *ehci)
{ … }

void ehci_adjust_port_wakeup_flags(struct ehci_hcd *ehci,
		bool suspending, bool do_wakeup)
{ … }
EXPORT_SYMBOL_GPL(…);

static int ehci_bus_suspend (struct usb_hcd *hcd)
{ … }


/* caller has locked the root hub, and should reset/reinit on error */
static int ehci_bus_resume (struct usb_hcd *hcd)
{ … }

static unsigned long ehci_get_resuming_ports(struct usb_hcd *hcd)
{ … }

#else

#define ehci_bus_suspend …
#define ehci_bus_resume …
#define ehci_get_resuming_ports …

#endif	/* CONFIG_PM */

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

/*
 * Sets the owner of a port
 */
static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
{ … }

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

static int check_reset_complete (
	struct ehci_hcd	*ehci,
	int		index,
	u32 __iomem	*status_reg,
	int		port_status
) { … }

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


/* build "status change" packet (one or two bytes) from HC registers */

static int
ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
{ … }

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

static void
ehci_hub_descriptor (
	struct ehci_hcd			*ehci,
	struct usb_hub_descriptor	*desc
) { … }

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

int ehci_hub_control(
	struct usb_hcd	*hcd,
	u16		typeReq,
	u16		wValue,
	u16		wIndex,
	char		*buf,
	u16		wLength
) { … }
EXPORT_SYMBOL_GPL(…);

static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
{ … }

static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
{ … }

static int ehci_port_power(struct ehci_hcd *ehci, int portnum, bool enable)
{ … }