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1157f69b WT |
1 | /* |
2 | * USB Wishbone-Serial adapter driver | |
3 | * | |
4 | * Copyright (C) 2013 Wesley W. Terpstra <w.terpstra@gsi.de> | |
5 | * Copyright (C) 2013 GSI Helmholtz Centre for Heavy Ion Research GmbH | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version 2 | |
10 | * of the License, or (at your option) any later version. | |
11 | */ | |
12 | ||
13 | #include <linux/kernel.h> | |
1157f69b WT |
14 | #include <linux/tty.h> |
15 | #include <linux/module.h> | |
16 | #include <linux/usb.h> | |
17 | #include <linux/usb/serial.h> | |
18 | #include <linux/uaccess.h> | |
19 | ||
20 | #define GSI_VENDOR_OPENCLOSE 0xB0 | |
21 | ||
22 | static const struct usb_device_id id_table[] = { | |
23 | { USB_DEVICE_AND_INTERFACE_INFO(0x1D50, 0x6062, 0xFF, 0xFF, 0xFF) }, | |
24 | { }, | |
25 | }; | |
26 | MODULE_DEVICE_TABLE(usb, id_table); | |
27 | ||
28 | /* | |
29 | * Etherbone must be told that a new stream has begun before data arrives. | |
30 | * This is necessary to restart the negotiation of Wishbone bus parameters. | |
31 | * Similarly, when the stream ends, Etherbone must be told so that the cycle | |
32 | * line can be driven low in the case that userspace failed to do so. | |
33 | */ | |
34 | static int usb_gsi_openclose(struct usb_serial_port *port, int value) | |
35 | { | |
36 | struct usb_device *dev = port->serial->dev; | |
37 | ||
38 | return usb_control_msg( | |
39 | dev, | |
40 | usb_sndctrlpipe(dev, 0), /* Send to EP0OUT */ | |
41 | GSI_VENDOR_OPENCLOSE, | |
42 | USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE, | |
43 | value, /* wValue = device is open(1) or closed(0) */ | |
44 | port->serial->interface->cur_altsetting->desc.bInterfaceNumber, | |
b8a261b5 | 45 | NULL, 0, /* There is no data stage */ |
1157f69b WT |
46 | 5000); /* Timeout till operation fails */ |
47 | } | |
48 | ||
49 | static int wishbone_serial_open(struct tty_struct *tty, | |
50 | struct usb_serial_port *port) | |
51 | { | |
52 | int retval; | |
53 | ||
54 | retval = usb_gsi_openclose(port, 1); | |
55 | if (retval) { | |
56 | dev_err(&port->serial->dev->dev, | |
57 | "Could not mark device as open (%d)\n", | |
58 | retval); | |
59 | return retval; | |
60 | } | |
61 | ||
62 | retval = usb_serial_generic_open(tty, port); | |
63 | if (retval) | |
64 | usb_gsi_openclose(port, 0); | |
65 | ||
66 | return retval; | |
67 | } | |
68 | ||
69 | static void wishbone_serial_close(struct usb_serial_port *port) | |
70 | { | |
71 | usb_serial_generic_close(port); | |
72 | usb_gsi_openclose(port, 0); | |
73 | } | |
74 | ||
75 | static struct usb_serial_driver wishbone_serial_device = { | |
76 | .driver = { | |
77 | .owner = THIS_MODULE, | |
78 | .name = "wishbone_serial", | |
79 | }, | |
80 | .id_table = id_table, | |
81 | .num_ports = 1, | |
82 | .open = &wishbone_serial_open, | |
83 | .close = &wishbone_serial_close, | |
84 | }; | |
85 | ||
86 | static struct usb_serial_driver * const serial_drivers[] = { | |
87 | &wishbone_serial_device, NULL | |
88 | }; | |
89 | ||
90 | module_usb_serial_driver(serial_drivers, id_table); | |
91 | ||
92 | MODULE_AUTHOR("Wesley W. Terpstra <w.terpstra@gsi.de>"); | |
93 | MODULE_DESCRIPTION("USB Wishbone-Serial adapter"); | |
94 | MODULE_LICENSE("GPL"); |