mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
90 lines
2.4 KiB
90 lines
2.4 KiB
// SPDX-License-Identifier: GPL-2.0+ |
|
/* |
|
* USB Wishbone-Serial adapter driver |
|
* |
|
* Copyright (C) 2013 Wesley W. Terpstra <[email protected]> |
|
* 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 <[email protected]>"); |
|
MODULE_DESCRIPTION("USB Wishbone-Serial adapter"); |
|
MODULE_LICENSE("GPL");
|
|
|