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47ee3051 DB |
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 | |
9cb00073 | 17 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
47ee3051 DB |
18 | */ |
19 | ||
20 | // #define DEBUG // error path messages, extra info | |
21 | // #define VERBOSE // more; success messages | |
22 | ||
47ee3051 | 23 | #include <linux/module.h> |
47ee3051 DB |
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> | |
3692e94f | 30 | #include <linux/usb/usbnet.h> |
5a0e3ad6 | 31 | #include <linux/gfp.h> |
47ee3051 DB |
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 | ||
69 | struct gl_packet { | |
53ebb3b8 | 70 | __le32 packet_length; |
47ee3051 DB |
71 | char packet_data [1]; |
72 | }; | |
73 | ||
74 | struct gl_header { | |
53ebb3b8 | 75 | __le32 packet_count; |
47ee3051 DB |
76 | struct gl_packet packets; |
77 | }; | |
78 | ||
47ee3051 DB |
79 | static 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; | |
53ebb3b8 | 85 | u32 count; |
47ee3051 | 86 | |
eb85569f EG |
87 | /* This check is no longer done by usbnet */ |
88 | if (skb->len < dev->net->hard_header_len) | |
89 | return 0; | |
90 | ||
47ee3051 DB |
91 | header = (struct gl_header *) skb->data; |
92 | ||
93 | // get the packet count of the received skb | |
53ebb3b8 AV |
94 | count = le32_to_cpu(header->packet_count); |
95 | if (count > GL_MAX_TRANSMIT_PACKETS) { | |
49ae25b0 GKH |
96 | netdev_dbg(dev->net, |
97 | "genelink: invalid received packet count %u\n", | |
98 | count); | |
47ee3051 DB |
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 | ||
53ebb3b8 | 108 | while (count > 1) { |
47ee3051 DB |
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) { | |
49ae25b0 GKH |
114 | netdev_dbg(dev->net, "genelink: invalid rx length %d\n", |
115 | size); | |
47ee3051 DB |
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 | |
53ebb3b8 AV |
130 | packet = (struct gl_packet *)&packet->packet_data[size]; |
131 | count--; | |
47ee3051 DB |
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) { | |
49ae25b0 GKH |
141 | netdev_dbg(dev->net, "genelink: invalid rx length %d\n", |
142 | skb->len); | |
47ee3051 DB |
143 | return 0; |
144 | } | |
145 | return 1; | |
146 | } | |
147 | ||
148 | static struct sk_buff * | |
55016f10 | 149 | genelink_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags) |
47ee3051 DB |
150 | { |
151 | int padlen; | |
152 | int length = skb->len; | |
153 | int headroom = skb_headroom(skb); | |
154 | int tailroom = skb_tailroom(skb); | |
53ebb3b8 AV |
155 | __le32 *packet_count; |
156 | __le32 *packet_len; | |
47ee3051 DB |
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); | |
27a884dc | 166 | skb_set_tail_pointer(skb, skb->len); |
47ee3051 DB |
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 | |
53ebb3b8 | 178 | packet_count = (__le32 *) skb_push(skb, (4 + 4*1)); |
47ee3051 DB |
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 | ||
191 | static 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 | ||
200 | static const struct driver_info genelink_info = { | |
201 | .description = "Genesys GeneLink", | |
c261344d | 202 | .flags = FLAG_POINTTOPOINT | FLAG_FRAMING_GL | FLAG_NO_SETINT, |
47ee3051 DB |
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 | ||
214 | static 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 | }; | |
225 | MODULE_DEVICE_TABLE(usb, products); | |
226 | ||
227 | static struct usb_driver gl620a_driver = { | |
47ee3051 DB |
228 | .name = "gl620a", |
229 | .id_table = products, | |
230 | .probe = usbnet_probe, | |
231 | .disconnect = usbnet_disconnect, | |
232 | .suspend = usbnet_suspend, | |
233 | .resume = usbnet_resume, | |
e1f12eb6 | 234 | .disable_hub_initiated_lpm = 1, |
47ee3051 DB |
235 | }; |
236 | ||
d632eb1b | 237 | module_usb_driver(gl620a_driver); |
47ee3051 DB |
238 | |
239 | MODULE_AUTHOR("Jiun-Jie Huang"); | |
240 | MODULE_DESCRIPTION("GL620-USB-A Host-to-Host Link cables"); | |
241 | MODULE_LICENSE("GPL"); | |
242 |