mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-04 07:36:46 +07:00
7a8a3a9bec
Introducing struct otg and collecting otg specific members to it from struct usb_phy. There are no changes to struct usb_phy at this stage. This also renames transceiver specific functions, and offers aliases for the old otg ones. Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Reviewed-by: Marek Vasut <marek.vasut@gmail.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
103 lines
2.5 KiB
C
103 lines
2.5 KiB
C
/*
|
|
* otg.c -- USB OTG utility code
|
|
*
|
|
* Copyright (C) 2004 Texas Instruments
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/export.h>
|
|
#include <linux/device.h>
|
|
|
|
#include <linux/usb/otg.h>
|
|
|
|
static struct usb_phy *phy;
|
|
|
|
/**
|
|
* usb_get_transceiver - find the (single) USB transceiver
|
|
*
|
|
* Returns the transceiver driver, after getting a refcount to it; or
|
|
* null if there is no such transceiver. The caller is responsible for
|
|
* calling usb_put_transceiver() to release that count.
|
|
*
|
|
* For use by USB host and peripheral drivers.
|
|
*/
|
|
struct usb_phy *usb_get_transceiver(void)
|
|
{
|
|
if (phy)
|
|
get_device(phy->dev);
|
|
return phy;
|
|
}
|
|
EXPORT_SYMBOL(usb_get_transceiver);
|
|
|
|
/**
|
|
* usb_put_transceiver - release the (single) USB transceiver
|
|
* @x: the transceiver returned by usb_get_transceiver()
|
|
*
|
|
* Releases a refcount the caller received from usb_get_transceiver().
|
|
*
|
|
* For use by USB host and peripheral drivers.
|
|
*/
|
|
void usb_put_transceiver(struct usb_phy *x)
|
|
{
|
|
if (x)
|
|
put_device(x->dev);
|
|
}
|
|
EXPORT_SYMBOL(usb_put_transceiver);
|
|
|
|
/**
|
|
* usb_set_transceiver - declare the (single) USB transceiver
|
|
* @x: the USB transceiver to be used; or NULL
|
|
*
|
|
* This call is exclusively for use by transceiver drivers, which
|
|
* coordinate the activities of drivers for host and peripheral
|
|
* controllers, and in some cases for VBUS current regulation.
|
|
*/
|
|
int usb_set_transceiver(struct usb_phy *x)
|
|
{
|
|
if (phy && x)
|
|
return -EBUSY;
|
|
phy = x;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(usb_set_transceiver);
|
|
|
|
const char *otg_state_string(enum usb_otg_state state)
|
|
{
|
|
switch (state) {
|
|
case OTG_STATE_A_IDLE:
|
|
return "a_idle";
|
|
case OTG_STATE_A_WAIT_VRISE:
|
|
return "a_wait_vrise";
|
|
case OTG_STATE_A_WAIT_BCON:
|
|
return "a_wait_bcon";
|
|
case OTG_STATE_A_HOST:
|
|
return "a_host";
|
|
case OTG_STATE_A_SUSPEND:
|
|
return "a_suspend";
|
|
case OTG_STATE_A_PERIPHERAL:
|
|
return "a_peripheral";
|
|
case OTG_STATE_A_WAIT_VFALL:
|
|
return "a_wait_vfall";
|
|
case OTG_STATE_A_VBUS_ERR:
|
|
return "a_vbus_err";
|
|
case OTG_STATE_B_IDLE:
|
|
return "b_idle";
|
|
case OTG_STATE_B_SRP_INIT:
|
|
return "b_srp_init";
|
|
case OTG_STATE_B_PERIPHERAL:
|
|
return "b_peripheral";
|
|
case OTG_STATE_B_WAIT_ACON:
|
|
return "b_wait_acon";
|
|
case OTG_STATE_B_HOST:
|
|
return "b_host";
|
|
default:
|
|
return "UNDEFINED";
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(otg_state_string);
|