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1ccea77e | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
47ee3051 DB |
2 | /* |
3 | * GeneSys GL620USB-A based links | |
4 | * Copyright (C) 2001 by Jiun-Jie Huang <huangjj@genesyslogic.com.tw> | |
5 | * Copyright (C) 2001 by Stanislav Brabec <utx@penguin.cz> | |
47ee3051 DB |
6 | */ |
7 | ||
8 | // #define DEBUG // error path messages, extra info | |
9 | // #define VERBOSE // more; success messages | |
10 | ||
47ee3051 | 11 | #include <linux/module.h> |
47ee3051 DB |
12 | #include <linux/netdevice.h> |
13 | #include <linux/etherdevice.h> | |
14 | #include <linux/ethtool.h> | |
15 | #include <linux/workqueue.h> | |
16 | #include <linux/mii.h> | |
17 | #include <linux/usb.h> | |
3692e94f | 18 | #include <linux/usb/usbnet.h> |
5a0e3ad6 | 19 | #include <linux/gfp.h> |
47ee3051 DB |
20 | |
21 | ||
22 | /* | |
23 | * GeneSys GL620USB-A (www.genesyslogic.com.tw) | |
24 | * | |
25 | * ... should partially interop with the Win32 driver for this hardware. | |
26 | * The GeneSys docs imply there's some NDIS issue motivating this framing. | |
27 | * | |
28 | * Some info from GeneSys: | |
29 | * - GL620USB-A is full duplex; GL620USB is only half duplex for bulk. | |
30 | * (Some cables, like the BAFO-100c, use the half duplex version.) | |
31 | * - For the full duplex model, the low bit of the version code says | |
32 | * which side is which ("left/right"). | |
33 | * - For the half duplex type, a control/interrupt handshake settles | |
34 | * the transfer direction. (That's disabled here, partially coded.) | |
35 | * A control URB would block until other side writes an interrupt. | |
36 | * | |
37 | * Original code from Jiun-Jie Huang <huangjj@genesyslogic.com.tw> | |
38 | * and merged into "usbnet" by Stanislav Brabec <utx@penguin.cz>. | |
39 | */ | |
40 | ||
41 | // control msg write command | |
42 | #define GENELINK_CONNECT_WRITE 0xF0 | |
43 | // interrupt pipe index | |
44 | #define GENELINK_INTERRUPT_PIPE 0x03 | |
45 | // interrupt read buffer size | |
46 | #define INTERRUPT_BUFSIZE 0x08 | |
47 | // interrupt pipe interval value | |
48 | #define GENELINK_INTERRUPT_INTERVAL 0x10 | |
49 | // max transmit packet number per transmit | |
50 | #define GL_MAX_TRANSMIT_PACKETS 32 | |
51 | // max packet length | |
52 | #define GL_MAX_PACKET_LEN 1514 | |
53 | // max receive buffer size | |
54 | #define GL_RCV_BUF_SIZE \ | |
55 | (((GL_MAX_PACKET_LEN + 4) * GL_MAX_TRANSMIT_PACKETS) + 4) | |
56 | ||
57 | struct gl_packet { | |
53ebb3b8 | 58 | __le32 packet_length; |
cc727b64 | 59 | char packet_data[]; |
47ee3051 DB |
60 | }; |
61 | ||
62 | struct gl_header { | |
53ebb3b8 | 63 | __le32 packet_count; |
47ee3051 DB |
64 | struct gl_packet packets; |
65 | }; | |
66 | ||
47ee3051 DB |
67 | static int genelink_rx_fixup(struct usbnet *dev, struct sk_buff *skb) |
68 | { | |
69 | struct gl_header *header; | |
70 | struct gl_packet *packet; | |
71 | struct sk_buff *gl_skb; | |
72 | u32 size; | |
53ebb3b8 | 73 | u32 count; |
47ee3051 | 74 | |
eb85569f EG |
75 | /* This check is no longer done by usbnet */ |
76 | if (skb->len < dev->net->hard_header_len) | |
77 | return 0; | |
78 | ||
47ee3051 DB |
79 | header = (struct gl_header *) skb->data; |
80 | ||
81 | // get the packet count of the received skb | |
53ebb3b8 AV |
82 | count = le32_to_cpu(header->packet_count); |
83 | if (count > GL_MAX_TRANSMIT_PACKETS) { | |
49ae25b0 GKH |
84 | netdev_dbg(dev->net, |
85 | "genelink: invalid received packet count %u\n", | |
86 | count); | |
47ee3051 DB |
87 | return 0; |
88 | } | |
89 | ||
90 | // set the current packet pointer to the first packet | |
91 | packet = &header->packets; | |
92 | ||
93 | // decrement the length for the packet count size 4 bytes | |
94 | skb_pull(skb, 4); | |
95 | ||
53ebb3b8 | 96 | while (count > 1) { |
47ee3051 DB |
97 | // get the packet length |
98 | size = le32_to_cpu(packet->packet_length); | |
99 | ||
100 | // this may be a broken packet | |
101 | if (size > GL_MAX_PACKET_LEN) { | |
49ae25b0 GKH |
102 | netdev_dbg(dev->net, "genelink: invalid rx length %d\n", |
103 | size); | |
47ee3051 DB |
104 | return 0; |
105 | } | |
106 | ||
107 | // allocate the skb for the individual packet | |
108 | gl_skb = alloc_skb(size, GFP_ATOMIC); | |
109 | if (gl_skb) { | |
110 | ||
111 | // copy the packet data to the new skb | |
59ae1d12 | 112 | skb_put_data(gl_skb, packet->packet_data, size); |
47ee3051 DB |
113 | usbnet_skb_return(dev, gl_skb); |
114 | } | |
115 | ||
116 | // advance to the next packet | |
53ebb3b8 AV |
117 | packet = (struct gl_packet *)&packet->packet_data[size]; |
118 | count--; | |
47ee3051 DB |
119 | |
120 | // shift the data pointer to the next gl_packet | |
121 | skb_pull(skb, size + 4); | |
122 | } | |
123 | ||
124 | // skip the packet length field 4 bytes | |
125 | skb_pull(skb, 4); | |
126 | ||
127 | if (skb->len > GL_MAX_PACKET_LEN) { | |
49ae25b0 GKH |
128 | netdev_dbg(dev->net, "genelink: invalid rx length %d\n", |
129 | skb->len); | |
47ee3051 DB |
130 | return 0; |
131 | } | |
132 | return 1; | |
133 | } | |
134 | ||
135 | static struct sk_buff * | |
55016f10 | 136 | genelink_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags) |
47ee3051 DB |
137 | { |
138 | int padlen; | |
139 | int length = skb->len; | |
140 | int headroom = skb_headroom(skb); | |
141 | int tailroom = skb_tailroom(skb); | |
53ebb3b8 AV |
142 | __le32 *packet_count; |
143 | __le32 *packet_len; | |
47ee3051 DB |
144 | |
145 | // FIXME: magic numbers, bleech | |
146 | padlen = ((skb->len + (4 + 4*1)) % 64) ? 0 : 1; | |
147 | ||
148 | if ((!skb_cloned(skb)) | |
149 | && ((headroom + tailroom) >= (padlen + (4 + 4*1)))) { | |
150 | if ((headroom < (4 + 4*1)) || (tailroom < padlen)) { | |
151 | skb->data = memmove(skb->head + (4 + 4*1), | |
152 | skb->data, skb->len); | |
27a884dc | 153 | skb_set_tail_pointer(skb, skb->len); |
47ee3051 DB |
154 | } |
155 | } else { | |
156 | struct sk_buff *skb2; | |
157 | skb2 = skb_copy_expand(skb, (4 + 4*1) , padlen, flags); | |
158 | dev_kfree_skb_any(skb); | |
159 | skb = skb2; | |
160 | if (!skb) | |
161 | return NULL; | |
162 | } | |
163 | ||
164 | // attach the packet count to the header | |
d58ff351 | 165 | packet_count = skb_push(skb, (4 + 4 * 1)); |
47ee3051 DB |
166 | packet_len = packet_count + 1; |
167 | ||
168 | *packet_count = cpu_to_le32(1); | |
169 | *packet_len = cpu_to_le32(length); | |
170 | ||
171 | // add padding byte | |
172 | if ((skb->len % dev->maxpacket) == 0) | |
173 | skb_put(skb, 1); | |
174 | ||
175 | return skb; | |
176 | } | |
177 | ||
178 | static int genelink_bind(struct usbnet *dev, struct usb_interface *intf) | |
179 | { | |
180 | dev->hard_mtu = GL_RCV_BUF_SIZE; | |
181 | dev->net->hard_header_len += 4; | |
182 | dev->in = usb_rcvbulkpipe(dev->udev, dev->driver_info->in); | |
183 | dev->out = usb_sndbulkpipe(dev->udev, dev->driver_info->out); | |
184 | return 0; | |
185 | } | |
186 | ||
187 | static const struct driver_info genelink_info = { | |
188 | .description = "Genesys GeneLink", | |
c261344d | 189 | .flags = FLAG_POINTTOPOINT | FLAG_FRAMING_GL | FLAG_NO_SETINT, |
47ee3051 DB |
190 | .bind = genelink_bind, |
191 | .rx_fixup = genelink_rx_fixup, | |
192 | .tx_fixup = genelink_tx_fixup, | |
193 | ||
194 | .in = 1, .out = 2, | |
195 | ||
196 | #ifdef GENELINK_ACK | |
197 | .check_connect =genelink_check_connect, | |
198 | #endif | |
199 | }; | |
200 | ||
201 | static const struct usb_device_id products [] = { | |
202 | ||
203 | { | |
204 | USB_DEVICE(0x05e3, 0x0502), // GL620USB-A | |
205 | .driver_info = (unsigned long) &genelink_info, | |
206 | }, | |
207 | /* NOT: USB_DEVICE(0x05e3, 0x0501), // GL620USB | |
208 | * that's half duplex, not currently supported | |
209 | */ | |
210 | { }, // END | |
211 | }; | |
212 | MODULE_DEVICE_TABLE(usb, products); | |
213 | ||
214 | static struct usb_driver gl620a_driver = { | |
47ee3051 DB |
215 | .name = "gl620a", |
216 | .id_table = products, | |
217 | .probe = usbnet_probe, | |
218 | .disconnect = usbnet_disconnect, | |
219 | .suspend = usbnet_suspend, | |
220 | .resume = usbnet_resume, | |
e1f12eb6 | 221 | .disable_hub_initiated_lpm = 1, |
47ee3051 DB |
222 | }; |
223 | ||
d632eb1b | 224 | module_usb_driver(gl620a_driver); |
47ee3051 DB |
225 | |
226 | MODULE_AUTHOR("Jiun-Jie Huang"); | |
227 | MODULE_DESCRIPTION("GL620-USB-A Host-to-Host Link cables"); | |
228 | MODULE_LICENSE("GPL"); | |
229 |