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