1 /*
2 * GeneSys GL620USB-A based links
3 * Copyright (C) 2001 by Jiun-Jie Huang <huangjj@genesyslogic.com.tw>
4 * Copyright (C) 2001 by Stanislav Brabec <utx@penguin.cz>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 // #define DEBUG // error path messages, extra info
22 // #define VERBOSE // more; success messages
23
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <linux/netdevice.h>
27 #include <linux/etherdevice.h>
28 #include <linux/ethtool.h>
29 #include <linux/workqueue.h>
30 #include <linux/mii.h>
31 #include <linux/usb.h>
32 #include <linux/usb/usbnet.h>
33
34
35 /*
36 * GeneSys GL620USB-A (www.genesyslogic.com.tw)
37 *
38 * ... should partially interop with the Win32 driver for this hardware.
39 * The GeneSys docs imply there's some NDIS issue motivating this framing.
40 *
41 * Some info from GeneSys:
42 * - GL620USB-A is full duplex; GL620USB is only half duplex for bulk.
43 * (Some cables, like the BAFO-100c, use the half duplex version.)
44 * - For the full duplex model, the low bit of the version code says
45 * which side is which ("left/right").
46 * - For the half duplex type, a control/interrupt handshake settles
47 * the transfer direction. (That's disabled here, partially coded.)
48 * A control URB would block until other side writes an interrupt.
49 *
50 * Original code from Jiun-Jie Huang <huangjj@genesyslogic.com.tw>
51 * and merged into "usbnet" by Stanislav Brabec <utx@penguin.cz>.
52 */
53
54 // control msg write command
55 #define GENELINK_CONNECT_WRITE 0xF0
56 // interrupt pipe index
57 #define GENELINK_INTERRUPT_PIPE 0x03
58 // interrupt read buffer size
59 #define INTERRUPT_BUFSIZE 0x08
60 // interrupt pipe interval value
61 #define GENELINK_INTERRUPT_INTERVAL 0x10
62 // max transmit packet number per transmit
63 #define GL_MAX_TRANSMIT_PACKETS 32
64 // max packet length
65 #define GL_MAX_PACKET_LEN 1514
66 // max receive buffer size
67 #define GL_RCV_BUF_SIZE \
68 (((GL_MAX_PACKET_LEN + 4) * GL_MAX_TRANSMIT_PACKETS) + 4)
69
70 struct gl_packet {
71 __le32 packet_length;
72 char packet_data [1];
73 };
74
75 struct gl_header {
76 __le32 packet_count;
77 struct gl_packet packets;
78 };
79
80 static int genelink_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
81 {
82 struct gl_header *header;
83 struct gl_packet *packet;
84 struct sk_buff *gl_skb;
85 u32 size;
86 u32 count;
87
88 header = (struct gl_header *) skb->data;
89
90 // get the packet count of the received skb
91 count = le32_to_cpu(header->packet_count);
92 if (count > GL_MAX_TRANSMIT_PACKETS) {
93 dbg("genelink: invalid received packet count %u", count);
94 return 0;
95 }
96
97 // set the current packet pointer to the first packet
98 packet = &header->packets;
99
100 // decrement the length for the packet count size 4 bytes
101 skb_pull(skb, 4);
102
103 while (count > 1) {
104 // get the packet length
105 size = le32_to_cpu(packet->packet_length);
106
107 // this may be a broken packet
108 if (size > GL_MAX_PACKET_LEN) {
109 dbg("genelink: invalid rx length %d", size);
110 return 0;
111 }
112
113 // allocate the skb for the individual packet
114 gl_skb = alloc_skb(size, GFP_ATOMIC);
115 if (gl_skb) {
116
117 // copy the packet data to the new skb
118 memcpy(skb_put(gl_skb, size),
119 packet->packet_data, size);
120 usbnet_skb_return(dev, gl_skb);
121 }
122
123 // advance to the next packet
124 packet = (struct gl_packet *)&packet->packet_data[size];
125 count--;
126
127 // shift the data pointer to the next gl_packet
128 skb_pull(skb, size + 4);
129 }
130
131 // skip the packet length field 4 bytes
132 skb_pull(skb, 4);
133
134 if (skb->len > GL_MAX_PACKET_LEN) {
135 dbg("genelink: invalid rx length %d", skb->len);
136 return 0;
137 }
138 return 1;
139 }
140
141 static struct sk_buff *
142 genelink_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
143 {
144 int padlen;
145 int length = skb->len;
146 int headroom = skb_headroom(skb);
147 int tailroom = skb_tailroom(skb);
148 __le32 *packet_count;
149 __le32 *packet_len;
150
151 // FIXME: magic numbers, bleech
152 padlen = ((skb->len + (4 + 4*1)) % 64) ? 0 : 1;
153
154 if ((!skb_cloned(skb))
155 && ((headroom + tailroom) >= (padlen + (4 + 4*1)))) {
156 if ((headroom < (4 + 4*1)) || (tailroom < padlen)) {
157 skb->data = memmove(skb->head + (4 + 4*1),
158 skb->data, skb->len);
159 skb_set_tail_pointer(skb, skb->len);
160 }
161 } else {
162 struct sk_buff *skb2;
163 skb2 = skb_copy_expand(skb, (4 + 4*1) , padlen, flags);
164 dev_kfree_skb_any(skb);
165 skb = skb2;
166 if (!skb)
167 return NULL;
168 }
169
170 // attach the packet count to the header
171 packet_count = (__le32 *) skb_push(skb, (4 + 4*1));
172 packet_len = packet_count + 1;
173
174 *packet_count = cpu_to_le32(1);
175 *packet_len = cpu_to_le32(length);
176
177 // add padding byte
178 if ((skb->len % dev->maxpacket) == 0)
179 skb_put(skb, 1);
180
181 return skb;
182 }
183
184 static int genelink_bind(struct usbnet *dev, struct usb_interface *intf)
185 {
186 dev->hard_mtu = GL_RCV_BUF_SIZE;
187 dev->net->hard_header_len += 4;
188 dev->in = usb_rcvbulkpipe(dev->udev, dev->driver_info->in);
189 dev->out = usb_sndbulkpipe(dev->udev, dev->driver_info->out);
190 return 0;
191 }
192
193 static const struct driver_info genelink_info = {
194 .description = "Genesys GeneLink",
195 .flags = FLAG_FRAMING_GL | FLAG_NO_SETINT,
196 .bind = genelink_bind,
197 .rx_fixup = genelink_rx_fixup,
198 .tx_fixup = genelink_tx_fixup,
199
200 .in = 1, .out = 2,
201
202 #ifdef GENELINK_ACK
203 .check_connect =genelink_check_connect,
204 #endif
205 };
206
207 static const struct usb_device_id products [] = {
208
209 {
210 USB_DEVICE(0x05e3, 0x0502), // GL620USB-A
211 .driver_info = (unsigned long) &genelink_info,
212 },
213 /* NOT: USB_DEVICE(0x05e3, 0x0501), // GL620USB
214 * that's half duplex, not currently supported
215 */
216 { }, // END
217 };
218 MODULE_DEVICE_TABLE(usb, products);
219
220 static struct usb_driver gl620a_driver = {
221 .name = "gl620a",
222 .id_table = products,
223 .probe = usbnet_probe,
224 .disconnect = usbnet_disconnect,
225 .suspend = usbnet_suspend,
226 .resume = usbnet_resume,
227 };
228
229 static int __init usbnet_init(void)
230 {
231 return usb_register(&gl620a_driver);
232 }
233 module_init(usbnet_init);
234
235 static void __exit usbnet_exit(void)
236 {
237 usb_deregister(&gl620a_driver);
238 }
239 module_exit(usbnet_exit);
240
241 MODULE_AUTHOR("Jiun-Jie Huang");
242 MODULE_DESCRIPTION("GL620-USB-A Host-to-Host Link cables");
243 MODULE_LICENSE("GPL");
244
245
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