mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-24 09:50:04 +00:00
![Anatolij Gustschin](/assets/img/avatar_default.png)
Provide common otg_state_string() and use it in drivers. Signed-off-by: Anatolij Gustschin <agust@denx.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
101 lines
2.5 KiB
C
101 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/device.h>
|
|
|
|
#include <linux/usb/otg.h>
|
|
|
|
static struct otg_transceiver *xceiv;
|
|
|
|
/**
|
|
* otg_get_transceiver - find the (single) OTG 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 otg_put_transceiver() to release that count.
|
|
*
|
|
* For use by USB host and peripheral drivers.
|
|
*/
|
|
struct otg_transceiver *otg_get_transceiver(void)
|
|
{
|
|
if (xceiv)
|
|
get_device(xceiv->dev);
|
|
return xceiv;
|
|
}
|
|
EXPORT_SYMBOL(otg_get_transceiver);
|
|
|
|
/**
|
|
* otg_put_transceiver - release the (single) OTG transceiver
|
|
* @x: the transceiver returned by otg_get_transceiver()
|
|
*
|
|
* Releases a refcount the caller received from otg_get_transceiver().
|
|
*
|
|
* For use by USB host and peripheral drivers.
|
|
*/
|
|
void otg_put_transceiver(struct otg_transceiver *x)
|
|
{
|
|
if (x)
|
|
put_device(x->dev);
|
|
}
|
|
EXPORT_SYMBOL(otg_put_transceiver);
|
|
|
|
/**
|
|
* otg_set_transceiver - declare the (single) OTG transceiver
|
|
* @x: the USB OTG 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 otg_set_transceiver(struct otg_transceiver *x)
|
|
{
|
|
if (xceiv && x)
|
|
return -EBUSY;
|
|
xceiv = x;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(otg_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);
|