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5fd54ace | 1 | // SPDX-License-Identifier: GPL-2.0+ |
1157f69b WT |
2 | /* |
3 | * USB Wishbone-Serial adapter driver | |
4 | * | |
5 | * Copyright (C) 2013 Wesley W. Terpstra <w.terpstra@gsi.de> | |
6 | * Copyright (C) 2013 GSI Helmholtz Centre for Heavy Ion Research GmbH | |
1157f69b WT |
7 | */ |
8 | ||
9 | #include <linux/kernel.h> | |
1157f69b WT |
10 | #include <linux/tty.h> |
11 | #include <linux/module.h> | |
12 | #include <linux/usb.h> | |
13 | #include <linux/usb/serial.h> | |
14 | #include <linux/uaccess.h> | |
15 | ||
16 | #define GSI_VENDOR_OPENCLOSE 0xB0 | |
17 | ||
18 | static const struct usb_device_id id_table[] = { | |
19 | { USB_DEVICE_AND_INTERFACE_INFO(0x1D50, 0x6062, 0xFF, 0xFF, 0xFF) }, | |
20 | { }, | |
21 | }; | |
22 | MODULE_DEVICE_TABLE(usb, id_table); | |
23 | ||
24 | /* | |
25 | * Etherbone must be told that a new stream has begun before data arrives. | |
26 | * This is necessary to restart the negotiation of Wishbone bus parameters. | |
27 | * Similarly, when the stream ends, Etherbone must be told so that the cycle | |
28 | * line can be driven low in the case that userspace failed to do so. | |
29 | */ | |
30 | static int usb_gsi_openclose(struct usb_serial_port *port, int value) | |
31 | { | |
32 | struct usb_device *dev = port->serial->dev; | |
33 | ||
34 | return usb_control_msg( | |
35 | dev, | |
36 | usb_sndctrlpipe(dev, 0), /* Send to EP0OUT */ | |
37 | GSI_VENDOR_OPENCLOSE, | |
38 | USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE, | |
39 | value, /* wValue = device is open(1) or closed(0) */ | |
40 | port->serial->interface->cur_altsetting->desc.bInterfaceNumber, | |
b8a261b5 | 41 | NULL, 0, /* There is no data stage */ |
1157f69b WT |
42 | 5000); /* Timeout till operation fails */ |
43 | } | |
44 | ||
45 | static int wishbone_serial_open(struct tty_struct *tty, | |
46 | struct usb_serial_port *port) | |
47 | { | |
48 | int retval; | |
49 | ||
50 | retval = usb_gsi_openclose(port, 1); | |
51 | if (retval) { | |
52 | dev_err(&port->serial->dev->dev, | |
53 | "Could not mark device as open (%d)\n", | |
54 | retval); | |
55 | return retval; | |
56 | } | |
57 | ||
58 | retval = usb_serial_generic_open(tty, port); | |
59 | if (retval) | |
60 | usb_gsi_openclose(port, 0); | |
61 | ||
62 | return retval; | |
63 | } | |
64 | ||
65 | static void wishbone_serial_close(struct usb_serial_port *port) | |
66 | { | |
67 | usb_serial_generic_close(port); | |
68 | usb_gsi_openclose(port, 0); | |
69 | } | |
70 | ||
71 | static struct usb_serial_driver wishbone_serial_device = { | |
72 | .driver = { | |
73 | .owner = THIS_MODULE, | |
74 | .name = "wishbone_serial", | |
75 | }, | |
76 | .id_table = id_table, | |
77 | .num_ports = 1, | |
78 | .open = &wishbone_serial_open, | |
79 | .close = &wishbone_serial_close, | |
80 | }; | |
81 | ||
82 | static struct usb_serial_driver * const serial_drivers[] = { | |
83 | &wishbone_serial_device, NULL | |
84 | }; | |
85 | ||
86 | module_usb_serial_driver(serial_drivers, id_table); | |
87 | ||
88 | MODULE_AUTHOR("Wesley W. Terpstra <w.terpstra@gsi.de>"); | |
89 | MODULE_DESCRIPTION("USB Wishbone-Serial adapter"); | |
90 | MODULE_LICENSE("GPL"); |