David Brownell | 47ee305 | 2005-08-31 09:53:42 -0700 | [diff] [blame] | 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 | |
David Brownell | 47ee305 | 2005-08-31 09:53:42 -0700 | [diff] [blame] | 24 | #include <linux/module.h> |
David Brownell | 47ee305 | 2005-08-31 09:53:42 -0700 | [diff] [blame] | 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 | |
| 33 | #include "usbnet.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 | |
| 71 | struct gl_packet { |
Al Viro | 53ebb3b | 2007-02-09 16:39:55 +0000 | [diff] [blame] | 72 | __le32 packet_length; |
David Brownell | 47ee305 | 2005-08-31 09:53:42 -0700 | [diff] [blame] | 73 | char packet_data [1]; |
| 74 | }; |
| 75 | |
| 76 | struct gl_header { |
Al Viro | 53ebb3b | 2007-02-09 16:39:55 +0000 | [diff] [blame] | 77 | __le32 packet_count; |
David Brownell | 47ee305 | 2005-08-31 09:53:42 -0700 | [diff] [blame] | 78 | struct gl_packet packets; |
| 79 | }; |
| 80 | |
David Brownell | 47ee305 | 2005-08-31 09:53:42 -0700 | [diff] [blame] | 81 | static 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; |
Al Viro | 53ebb3b | 2007-02-09 16:39:55 +0000 | [diff] [blame] | 87 | u32 count; |
David Brownell | 47ee305 | 2005-08-31 09:53:42 -0700 | [diff] [blame] | 88 | |
| 89 | header = (struct gl_header *) skb->data; |
| 90 | |
| 91 | // get the packet count of the received skb |
Al Viro | 53ebb3b | 2007-02-09 16:39:55 +0000 | [diff] [blame] | 92 | count = le32_to_cpu(header->packet_count); |
| 93 | if (count > GL_MAX_TRANSMIT_PACKETS) { |
| 94 | dbg("genelink: invalid received packet count %u", count); |
David Brownell | 47ee305 | 2005-08-31 09:53:42 -0700 | [diff] [blame] | 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 | |
Al Viro | 53ebb3b | 2007-02-09 16:39:55 +0000 | [diff] [blame] | 104 | while (count > 1) { |
David Brownell | 47ee305 | 2005-08-31 09:53:42 -0700 | [diff] [blame] | 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 |
Al Viro | 53ebb3b | 2007-02-09 16:39:55 +0000 | [diff] [blame] | 125 | packet = (struct gl_packet *)&packet->packet_data[size]; |
| 126 | count--; |
David Brownell | 47ee305 | 2005-08-31 09:53:42 -0700 | [diff] [blame] | 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 | |
| 142 | static struct sk_buff * |
Al Viro | 55016f1 | 2005-10-21 03:21:58 -0400 | [diff] [blame] | 143 | genelink_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags) |
David Brownell | 47ee305 | 2005-08-31 09:53:42 -0700 | [diff] [blame] | 144 | { |
| 145 | int padlen; |
| 146 | int length = skb->len; |
| 147 | int headroom = skb_headroom(skb); |
| 148 | int tailroom = skb_tailroom(skb); |
Al Viro | 53ebb3b | 2007-02-09 16:39:55 +0000 | [diff] [blame] | 149 | __le32 *packet_count; |
| 150 | __le32 *packet_len; |
David Brownell | 47ee305 | 2005-08-31 09:53:42 -0700 | [diff] [blame] | 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->tail = skb->data + 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 |
Al Viro | 53ebb3b | 2007-02-09 16:39:55 +0000 | [diff] [blame] | 172 | packet_count = (__le32 *) skb_push(skb, (4 + 4*1)); |
David Brownell | 47ee305 | 2005-08-31 09:53:42 -0700 | [diff] [blame] | 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 | |
| 185 | static 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 | |
| 194 | static const struct driver_info genelink_info = { |
| 195 | .description = "Genesys GeneLink", |
| 196 | .flags = 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 | |
| 208 | static 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 | }; |
| 219 | MODULE_DEVICE_TABLE(usb, products); |
| 220 | |
| 221 | static struct usb_driver gl620a_driver = { |
David Brownell | 47ee305 | 2005-08-31 09:53:42 -0700 | [diff] [blame] | 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 | |
| 230 | static int __init usbnet_init(void) |
| 231 | { |
| 232 | return usb_register(&gl620a_driver); |
| 233 | } |
| 234 | module_init(usbnet_init); |
| 235 | |
| 236 | static void __exit usbnet_exit(void) |
| 237 | { |
| 238 | usb_deregister(&gl620a_driver); |
| 239 | } |
| 240 | module_exit(usbnet_exit); |
| 241 | |
| 242 | MODULE_AUTHOR("Jiun-Jie Huang"); |
| 243 | MODULE_DESCRIPTION("GL620-USB-A Host-to-Host Link cables"); |
| 244 | MODULE_LICENSE("GPL"); |
| 245 | |