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cc28a20e OZ |
1 | /* |
2 | * Driver for USB ethernet port of Conexant CX82310-based ADSL routers | |
3 | * Copyright (C) 2010 by Ondrej Zary | |
4 | * some parts inspired by the cxacru driver | |
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/>. |
cc28a20e OZ |
18 | */ |
19 | ||
20 | #include <linux/module.h> | |
cc28a20e OZ |
21 | #include <linux/netdevice.h> |
22 | #include <linux/etherdevice.h> | |
23 | #include <linux/ethtool.h> | |
24 | #include <linux/workqueue.h> | |
25 | #include <linux/mii.h> | |
26 | #include <linux/usb.h> | |
27 | #include <linux/usb/usbnet.h> | |
28 | ||
29 | enum cx82310_cmd { | |
30 | CMD_START = 0x84, /* no effect? */ | |
31 | CMD_STOP = 0x85, /* no effect? */ | |
32 | CMD_GET_STATUS = 0x90, /* returns nothing? */ | |
33 | CMD_GET_MAC_ADDR = 0x91, /* read MAC address */ | |
34 | CMD_GET_LINK_STATUS = 0x92, /* not useful, link is always up */ | |
35 | CMD_ETHERNET_MODE = 0x99, /* unknown, needed during init */ | |
36 | }; | |
37 | ||
38 | enum cx82310_status { | |
39 | STATUS_UNDEFINED, | |
40 | STATUS_SUCCESS, | |
41 | STATUS_ERROR, | |
42 | STATUS_UNSUPPORTED, | |
43 | STATUS_UNIMPLEMENTED, | |
44 | STATUS_PARAMETER_ERROR, | |
45 | STATUS_DBG_LOOPBACK, | |
46 | }; | |
47 | ||
48 | #define CMD_PACKET_SIZE 64 | |
49 | /* first command after power on can take around 8 seconds */ | |
50 | #define CMD_TIMEOUT 15000 | |
51 | #define CMD_REPLY_RETRY 5 | |
52 | ||
53 | #define CX82310_MTU 1514 | |
54 | #define CMD_EP 0x01 | |
55 | ||
56 | /* | |
57 | * execute control command | |
58 | * - optionally send some data (command parameters) | |
59 | * - optionally wait for the reply | |
60 | * - optionally read some data from the reply | |
61 | */ | |
62 | static int cx82310_cmd(struct usbnet *dev, enum cx82310_cmd cmd, bool reply, | |
63 | u8 *wdata, int wlen, u8 *rdata, int rlen) | |
64 | { | |
65 | int actual_len, retries, ret; | |
66 | struct usb_device *udev = dev->udev; | |
67 | u8 *buf = kzalloc(CMD_PACKET_SIZE, GFP_KERNEL); | |
68 | ||
69 | if (!buf) | |
70 | return -ENOMEM; | |
71 | ||
72 | /* create command packet */ | |
73 | buf[0] = cmd; | |
74 | if (wdata) | |
75 | memcpy(buf + 4, wdata, min_t(int, wlen, CMD_PACKET_SIZE - 4)); | |
76 | ||
77 | /* send command packet */ | |
78 | ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, CMD_EP), buf, | |
79 | CMD_PACKET_SIZE, &actual_len, CMD_TIMEOUT); | |
80 | if (ret < 0) { | |
81 | dev_err(&dev->udev->dev, "send command %#x: error %d\n", | |
82 | cmd, ret); | |
83 | goto end; | |
84 | } | |
85 | ||
86 | if (reply) { | |
87 | /* wait for reply, retry if it's empty */ | |
88 | for (retries = 0; retries < CMD_REPLY_RETRY; retries++) { | |
89 | ret = usb_bulk_msg(udev, usb_rcvbulkpipe(udev, CMD_EP), | |
90 | buf, CMD_PACKET_SIZE, &actual_len, | |
91 | CMD_TIMEOUT); | |
92 | if (ret < 0) { | |
93 | dev_err(&dev->udev->dev, | |
94 | "reply receive error %d\n", ret); | |
95 | goto end; | |
96 | } | |
97 | if (actual_len > 0) | |
98 | break; | |
99 | } | |
100 | if (actual_len == 0) { | |
101 | dev_err(&dev->udev->dev, "no reply to command %#x\n", | |
102 | cmd); | |
103 | ret = -EIO; | |
104 | goto end; | |
105 | } | |
106 | if (buf[0] != cmd) { | |
107 | dev_err(&dev->udev->dev, | |
108 | "got reply to command %#x, expected: %#x\n", | |
109 | buf[0], cmd); | |
110 | ret = -EIO; | |
111 | goto end; | |
112 | } | |
113 | if (buf[1] != STATUS_SUCCESS) { | |
114 | dev_err(&dev->udev->dev, "command %#x failed: %#x\n", | |
115 | cmd, buf[1]); | |
116 | ret = -EIO; | |
117 | goto end; | |
118 | } | |
119 | if (rdata) | |
120 | memcpy(rdata, buf + 4, | |
121 | min_t(int, rlen, CMD_PACKET_SIZE - 4)); | |
122 | } | |
123 | end: | |
124 | kfree(buf); | |
125 | return ret; | |
126 | } | |
127 | ||
128 | #define partial_len data[0] /* length of partial packet data */ | |
129 | #define partial_rem data[1] /* remaining (missing) data length */ | |
130 | #define partial_data data[2] /* partial packet data */ | |
131 | ||
132 | static int cx82310_bind(struct usbnet *dev, struct usb_interface *intf) | |
133 | { | |
134 | int ret; | |
135 | char buf[15]; | |
136 | struct usb_device *udev = dev->udev; | |
137 | ||
138 | /* avoid ADSL modems - continue only if iProduct is "USB NET CARD" */ | |
7dbfdc23 OZ |
139 | if (usb_string(udev, udev->descriptor.iProduct, buf, sizeof(buf)) > 0 |
140 | && strcmp(buf, "USB NET CARD")) { | |
141 | dev_info(&udev->dev, "ignoring: probably an ADSL modem\n"); | |
cc28a20e OZ |
142 | return -ENODEV; |
143 | } | |
144 | ||
145 | ret = usbnet_get_endpoints(dev, intf); | |
146 | if (ret) | |
147 | return ret; | |
148 | ||
149 | /* | |
150 | * this must not include ethernet header as the device can send partial | |
441993da | 151 | * packets with no header (and sometimes even empty URBs) |
cc28a20e | 152 | */ |
441993da | 153 | dev->net->hard_header_len = 0; |
cc28a20e | 154 | /* we can send at most 1514 bytes of data (+ 2-byte header) per URB */ |
441993da | 155 | dev->hard_mtu = CX82310_MTU + 2; |
cc28a20e OZ |
156 | /* we can receive URBs up to 4KB from the device */ |
157 | dev->rx_urb_size = 4096; | |
158 | ||
159 | dev->partial_data = (unsigned long) kmalloc(dev->hard_mtu, GFP_KERNEL); | |
160 | if (!dev->partial_data) | |
161 | return -ENOMEM; | |
162 | ||
163 | /* enable ethernet mode (?) */ | |
164 | ret = cx82310_cmd(dev, CMD_ETHERNET_MODE, true, "\x01", 1, NULL, 0); | |
165 | if (ret) { | |
166 | dev_err(&udev->dev, "unable to enable ethernet mode: %d\n", | |
167 | ret); | |
168 | goto err; | |
169 | } | |
170 | ||
171 | /* get the MAC address */ | |
172 | ret = cx82310_cmd(dev, CMD_GET_MAC_ADDR, true, NULL, 0, | |
173 | dev->net->dev_addr, ETH_ALEN); | |
174 | if (ret) { | |
175 | dev_err(&udev->dev, "unable to read MAC address: %d\n", ret); | |
176 | goto err; | |
177 | } | |
178 | ||
179 | /* start (does not seem to have any effect?) */ | |
180 | ret = cx82310_cmd(dev, CMD_START, false, NULL, 0, NULL, 0); | |
181 | if (ret) | |
182 | goto err; | |
183 | ||
184 | return 0; | |
185 | err: | |
186 | kfree((void *)dev->partial_data); | |
187 | return ret; | |
188 | } | |
189 | ||
190 | static void cx82310_unbind(struct usbnet *dev, struct usb_interface *intf) | |
191 | { | |
192 | kfree((void *)dev->partial_data); | |
193 | } | |
194 | ||
195 | /* | |
196 | * RX is NOT easy - we can receive multiple packets per skb, each having 2-byte | |
197 | * packet length at the beginning. | |
198 | * The last packet might be incomplete (when it crosses the 4KB URB size), | |
199 | * continuing in the next skb (without any headers). | |
200 | * If a packet has odd length, there is one extra byte at the end (before next | |
201 | * packet or at the end of the URB). | |
202 | */ | |
203 | static int cx82310_rx_fixup(struct usbnet *dev, struct sk_buff *skb) | |
204 | { | |
205 | int len; | |
206 | struct sk_buff *skb2; | |
207 | ||
208 | /* | |
209 | * If the last skb ended with an incomplete packet, this skb contains | |
210 | * end of that packet at the beginning. | |
211 | */ | |
212 | if (dev->partial_rem) { | |
213 | len = dev->partial_len + dev->partial_rem; | |
214 | skb2 = alloc_skb(len, GFP_ATOMIC); | |
215 | if (!skb2) | |
216 | return 0; | |
217 | skb_put(skb2, len); | |
218 | memcpy(skb2->data, (void *)dev->partial_data, | |
219 | dev->partial_len); | |
220 | memcpy(skb2->data + dev->partial_len, skb->data, | |
221 | dev->partial_rem); | |
222 | usbnet_skb_return(dev, skb2); | |
223 | skb_pull(skb, (dev->partial_rem + 1) & ~1); | |
224 | dev->partial_rem = 0; | |
225 | if (skb->len < 2) | |
226 | return 1; | |
227 | } | |
228 | ||
cc28a20e OZ |
229 | /* a skb can contain multiple packets */ |
230 | while (skb->len > 1) { | |
231 | /* first two bytes are packet length */ | |
232 | len = skb->data[0] | (skb->data[1] << 8); | |
233 | skb_pull(skb, 2); | |
234 | ||
235 | /* if last packet in the skb, let usbnet to process it */ | |
236 | if (len == skb->len || len + 1 == skb->len) { | |
237 | skb_trim(skb, len); | |
238 | break; | |
239 | } | |
240 | ||
241 | if (len > CX82310_MTU) { | |
242 | dev_err(&dev->udev->dev, "RX packet too long: %d B\n", | |
243 | len); | |
244 | return 0; | |
245 | } | |
246 | ||
247 | /* incomplete packet, save it for the next skb */ | |
248 | if (len > skb->len) { | |
249 | dev->partial_len = skb->len; | |
250 | dev->partial_rem = len - skb->len; | |
251 | memcpy((void *)dev->partial_data, skb->data, | |
252 | dev->partial_len); | |
253 | skb_pull(skb, skb->len); | |
254 | break; | |
255 | } | |
256 | ||
257 | skb2 = alloc_skb(len, GFP_ATOMIC); | |
258 | if (!skb2) | |
259 | return 0; | |
260 | skb_put(skb2, len); | |
261 | memcpy(skb2->data, skb->data, len); | |
262 | /* process the packet */ | |
263 | usbnet_skb_return(dev, skb2); | |
264 | ||
265 | skb_pull(skb, (len + 1) & ~1); | |
266 | } | |
267 | ||
268 | /* let usbnet process the last packet */ | |
269 | return 1; | |
270 | } | |
271 | ||
272 | /* TX is easy, just add 2 bytes of length at the beginning */ | |
273 | static struct sk_buff *cx82310_tx_fixup(struct usbnet *dev, struct sk_buff *skb, | |
274 | gfp_t flags) | |
275 | { | |
276 | int len = skb->len; | |
277 | ||
278 | if (skb_headroom(skb) < 2) { | |
279 | struct sk_buff *skb2 = skb_copy_expand(skb, 2, 0, flags); | |
280 | dev_kfree_skb_any(skb); | |
281 | skb = skb2; | |
282 | if (!skb) | |
283 | return NULL; | |
284 | } | |
285 | skb_push(skb, 2); | |
286 | ||
287 | skb->data[0] = len; | |
288 | skb->data[1] = len >> 8; | |
289 | ||
290 | return skb; | |
291 | } | |
292 | ||
293 | ||
294 | static const struct driver_info cx82310_info = { | |
295 | .description = "Conexant CX82310 USB ethernet", | |
296 | .flags = FLAG_ETHER, | |
297 | .bind = cx82310_bind, | |
298 | .unbind = cx82310_unbind, | |
299 | .rx_fixup = cx82310_rx_fixup, | |
300 | .tx_fixup = cx82310_tx_fixup, | |
301 | }; | |
302 | ||
cc28a20e OZ |
303 | static const struct usb_device_id products[] = { |
304 | { | |
11ad714b | 305 | USB_DEVICE_AND_INTERFACE_INFO(0x0572, 0xcb01, 0xff, 0, 0), |
cc28a20e OZ |
306 | .driver_info = (unsigned long) &cx82310_info |
307 | }, | |
308 | { }, | |
309 | }; | |
310 | MODULE_DEVICE_TABLE(usb, products); | |
311 | ||
312 | static struct usb_driver cx82310_driver = { | |
313 | .name = "cx82310_eth", | |
314 | .id_table = products, | |
315 | .probe = usbnet_probe, | |
316 | .disconnect = usbnet_disconnect, | |
317 | .suspend = usbnet_suspend, | |
318 | .resume = usbnet_resume, | |
e1f12eb6 | 319 | .disable_hub_initiated_lpm = 1, |
cc28a20e OZ |
320 | }; |
321 | ||
d632eb1b | 322 | module_usb_driver(cx82310_driver); |
cc28a20e OZ |
323 | |
324 | MODULE_AUTHOR("Ondrej Zary"); | |
325 | MODULE_DESCRIPTION("Conexant CX82310-based ADSL router USB ethernet driver"); | |
326 | MODULE_LICENSE("GPL"); |