Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0+
/*
 * USB Wishbone-Serial adapter driver
 *
 * Copyright (C) 2013 Wesley W. Terpstra <w.terpstra@gsi.de>
 * Copyright (C) 2013 GSI Helmholtz Centre for Heavy Ion Research GmbH
 */
 
#include <linux/kernel.h>
#include <linux/tty.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include <linux/uaccess.h>
 
#define GSI_VENDOR_OPENCLOSE 0xB0
 
static const struct usb_device_id id_table[] = {
<------>{ USB_DEVICE_AND_INTERFACE_INFO(0x1D50, 0x6062, 0xFF, 0xFF, 0xFF) },
<------>{ },
};
MODULE_DEVICE_TABLE(usb, id_table);
 
/*
 * Etherbone must be told that a new stream has begun before data arrives.
 * This is necessary to restart the negotiation of Wishbone bus parameters.
 * Similarly, when the stream ends, Etherbone must be told so that the cycle
 * line can be driven low in the case that userspace failed to do so.
 */
static int usb_gsi_openclose(struct usb_serial_port *port, int value)
{
<------>struct usb_device *dev = port->serial->dev;
 
<------>return usb_control_msg(
<------><------>dev,
<------><------>usb_sndctrlpipe(dev, 0), /* Send to EP0OUT */
<------><------>GSI_VENDOR_OPENCLOSE,
<------><------>USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
<------><------>value, /* wValue = device is open(1) or closed(0) */
<------><------>port->serial->interface->cur_altsetting->desc.bInterfaceNumber,
<------><------>NULL, 0,  /* There is no data stage */
<------><------>5000); /* Timeout till operation fails */
}
 
static int wishbone_serial_open(struct tty_struct *tty,
<------><------><------><------>struct usb_serial_port *port)
{
<------>int retval;
 
<------>retval = usb_gsi_openclose(port, 1);
<------>if (retval) {
<------><------>dev_err(&port->serial->dev->dev,
<------><------>       "Could not mark device as open (%d)\n",
<------><------>       retval);
<------><------>return retval;
<------>}
 
<------>retval = usb_serial_generic_open(tty, port);
<------>if (retval)
<------><------>usb_gsi_openclose(port, 0);
 
<------>return retval;
}
 
static void wishbone_serial_close(struct usb_serial_port *port)
{
<------>usb_serial_generic_close(port);
<------>usb_gsi_openclose(port, 0);
}
 
static struct usb_serial_driver wishbone_serial_device = {
<------>.driver = {
<------><------>.owner =	THIS_MODULE,
<------><------>.name =		"wishbone_serial",
<------>},
<------>.id_table =		id_table,
<------>.num_ports =		1,
<------>.open =			&wishbone_serial_open,
<------>.close =		&wishbone_serial_close,
};
 
static struct usb_serial_driver * const serial_drivers[] = {
<------>&wishbone_serial_device, NULL
};
 
module_usb_serial_driver(serial_drivers, id_table);
 
MODULE_AUTHOR("Wesley W. Terpstra <w.terpstra@gsi.de>");
MODULE_DESCRIPTION("USB Wishbone-Serial adapter");
MODULE_LICENSE("GPL");