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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
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#include <linux/module.h>
22#include <linux/init.h>
23#include <linux/netdevice.h>
24#include <linux/etherdevice.h>
25#include <linux/ethtool.h>
26#include <linux/workqueue.h>
27#include <linux/mii.h>
28#include <linux/usb.h>
29#include <linux/usb/usbnet.h>
30
31enum cx82310_cmd {
32 CMD_START = 0x84, /* no effect? */
33 CMD_STOP = 0x85, /* no effect? */
34 CMD_GET_STATUS = 0x90, /* returns nothing? */
35 CMD_GET_MAC_ADDR = 0x91, /* read MAC address */
36 CMD_GET_LINK_STATUS = 0x92, /* not useful, link is always up */
37 CMD_ETHERNET_MODE = 0x99, /* unknown, needed during init */
38};
39
40enum cx82310_status {
41 STATUS_UNDEFINED,
42 STATUS_SUCCESS,
43 STATUS_ERROR,
44 STATUS_UNSUPPORTED,
45 STATUS_UNIMPLEMENTED,
46 STATUS_PARAMETER_ERROR,
47 STATUS_DBG_LOOPBACK,
48};
49
50#define CMD_PACKET_SIZE 64
51/* first command after power on can take around 8 seconds */
52#define CMD_TIMEOUT 15000
53#define CMD_REPLY_RETRY 5
54
55#define CX82310_MTU 1514
56#define CMD_EP 0x01
57
58/*
59 * execute control command
60 * - optionally send some data (command parameters)
61 * - optionally wait for the reply
62 * - optionally read some data from the reply
63 */
64static int cx82310_cmd(struct usbnet *dev, enum cx82310_cmd cmd, bool reply,
65 u8 *wdata, int wlen, u8 *rdata, int rlen)
66{
67 int actual_len, retries, ret;
68 struct usb_device *udev = dev->udev;
69 u8 *buf = kzalloc(CMD_PACKET_SIZE, GFP_KERNEL);
70
71 if (!buf)
72 return -ENOMEM;
73
74 /* create command packet */
75 buf[0] = cmd;
76 if (wdata)
77 memcpy(buf + 4, wdata, min_t(int, wlen, CMD_PACKET_SIZE - 4));
78
79 /* send command packet */
80 ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, CMD_EP), buf,
81 CMD_PACKET_SIZE, &actual_len, CMD_TIMEOUT);
82 if (ret < 0) {
83 dev_err(&dev->udev->dev, "send command %#x: error %d\n",
84 cmd, ret);
85 goto end;
86 }
87
88 if (reply) {
89 /* wait for reply, retry if it's empty */
90 for (retries = 0; retries < CMD_REPLY_RETRY; retries++) {
91 ret = usb_bulk_msg(udev, usb_rcvbulkpipe(udev, CMD_EP),
92 buf, CMD_PACKET_SIZE, &actual_len,
93 CMD_TIMEOUT);
94 if (ret < 0) {
95 dev_err(&dev->udev->dev,
96 "reply receive error %d\n", ret);
97 goto end;
98 }
99 if (actual_len > 0)
100 break;
101 }
102 if (actual_len == 0) {
103 dev_err(&dev->udev->dev, "no reply to command %#x\n",
104 cmd);
105 ret = -EIO;
106 goto end;
107 }
108 if (buf[0] != cmd) {
109 dev_err(&dev->udev->dev,
110 "got reply to command %#x, expected: %#x\n",
111 buf[0], cmd);
112 ret = -EIO;
113 goto end;
114 }
115 if (buf[1] != STATUS_SUCCESS) {
116 dev_err(&dev->udev->dev, "command %#x failed: %#x\n",
117 cmd, buf[1]);
118 ret = -EIO;
119 goto end;
120 }
121 if (rdata)
122 memcpy(rdata, buf + 4,
123 min_t(int, rlen, CMD_PACKET_SIZE - 4));
124 }
125end:
126 kfree(buf);
127 return ret;
128}
129
130#define partial_len data[0] /* length of partial packet data */
131#define partial_rem data[1] /* remaining (missing) data length */
132#define partial_data data[2] /* partial packet data */
133
134static int cx82310_bind(struct usbnet *dev, struct usb_interface *intf)
135{
136 int ret;
137 char buf[15];
138 struct usb_device *udev = dev->udev;
139
140 /* avoid ADSL modems - continue only if iProduct is "USB NET CARD" */
141 if (usb_string(udev, udev->descriptor.iProduct, buf, sizeof(buf)) > 0
142 && strcmp(buf, "USB NET CARD")) {
143 dev_info(&udev->dev, "ignoring: probably an ADSL modem\n");
144 return -ENODEV;
145 }
146
147 ret = usbnet_get_endpoints(dev, intf);
148 if (ret)
149 return ret;
150
151 /*
152 * this must not include ethernet header as the device can send partial
153 * packets with no header (and sometimes even empty URBs)
154 */
155 dev->net->hard_header_len = 0;
156 /* we can send at most 1514 bytes of data (+ 2-byte header) per URB */
157 dev->hard_mtu = CX82310_MTU + 2;
158 /* we can receive URBs up to 4KB from the device */
159 dev->rx_urb_size = 4096;
160
161 dev->partial_data = (unsigned long) kmalloc(dev->hard_mtu, GFP_KERNEL);
162 if (!dev->partial_data)
163 return -ENOMEM;
164
165 /* enable ethernet mode (?) */
166 ret = cx82310_cmd(dev, CMD_ETHERNET_MODE, true, "\x01", 1, NULL, 0);
167 if (ret) {
168 dev_err(&udev->dev, "unable to enable ethernet mode: %d\n",
169 ret);
170 goto err;
171 }
172
173 /* get the MAC address */
174 ret = cx82310_cmd(dev, CMD_GET_MAC_ADDR, true, NULL, 0,
175 dev->net->dev_addr, ETH_ALEN);
176 if (ret) {
177 dev_err(&udev->dev, "unable to read MAC address: %d\n", ret);
178 goto err;
179 }
180
181 /* start (does not seem to have any effect?) */
182 ret = cx82310_cmd(dev, CMD_START, false, NULL, 0, NULL, 0);
183 if (ret)
184 goto err;
185
186 return 0;
187err:
188 kfree((void *)dev->partial_data);
189 return ret;
190}
191
192static void cx82310_unbind(struct usbnet *dev, struct usb_interface *intf)
193{
194 kfree((void *)dev->partial_data);
195}
196
197/*
198 * RX is NOT easy - we can receive multiple packets per skb, each having 2-byte
199 * packet length at the beginning.
200 * The last packet might be incomplete (when it crosses the 4KB URB size),
201 * continuing in the next skb (without any headers).
202 * If a packet has odd length, there is one extra byte at the end (before next
203 * packet or at the end of the URB).
204 */
205static int cx82310_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
206{
207 int len;
208 struct sk_buff *skb2;
209
210 /*
211 * If the last skb ended with an incomplete packet, this skb contains
212 * end of that packet at the beginning.
213 */
214 if (dev->partial_rem) {
215 len = dev->partial_len + dev->partial_rem;
216 skb2 = alloc_skb(len, GFP_ATOMIC);
217 if (!skb2)
218 return 0;
219 skb_put(skb2, len);
220 memcpy(skb2->data, (void *)dev->partial_data,
221 dev->partial_len);
222 memcpy(skb2->data + dev->partial_len, skb->data,
223 dev->partial_rem);
224 usbnet_skb_return(dev, skb2);
225 skb_pull(skb, (dev->partial_rem + 1) & ~1);
226 dev->partial_rem = 0;
227 if (skb->len < 2)
228 return 1;
229 }
230
231 /* a skb can contain multiple packets */
232 while (skb->len > 1) {
233 /* first two bytes are packet length */
234 len = skb->data[0] | (skb->data[1] << 8);
235 skb_pull(skb, 2);
236
237 /* if last packet in the skb, let usbnet to process it */
238 if (len == skb->len || len + 1 == skb->len) {
239 skb_trim(skb, len);
240 break;
241 }
242
243 if (len > CX82310_MTU) {
244 dev_err(&dev->udev->dev, "RX packet too long: %d B\n",
245 len);
246 return 0;
247 }
248
249 /* incomplete packet, save it for the next skb */
250 if (len > skb->len) {
251 dev->partial_len = skb->len;
252 dev->partial_rem = len - skb->len;
253 memcpy((void *)dev->partial_data, skb->data,
254 dev->partial_len);
255 skb_pull(skb, skb->len);
256 break;
257 }
258
259 skb2 = alloc_skb(len, GFP_ATOMIC);
260 if (!skb2)
261 return 0;
262 skb_put(skb2, len);
263 memcpy(skb2->data, skb->data, len);
264 /* process the packet */
265 usbnet_skb_return(dev, skb2);
266
267 skb_pull(skb, (len + 1) & ~1);
268 }
269
270 /* let usbnet process the last packet */
271 return 1;
272}
273
274/* TX is easy, just add 2 bytes of length at the beginning */
275static struct sk_buff *cx82310_tx_fixup(struct usbnet *dev, struct sk_buff *skb,
276 gfp_t flags)
277{
278 int len = skb->len;
279
280 if (skb_headroom(skb) < 2) {
281 struct sk_buff *skb2 = skb_copy_expand(skb, 2, 0, flags);
282 dev_kfree_skb_any(skb);
283 skb = skb2;
284 if (!skb)
285 return NULL;
286 }
287 skb_push(skb, 2);
288
289 skb->data[0] = len;
290 skb->data[1] = len >> 8;
291
292 return skb;
293}
294
295
296static const struct driver_info cx82310_info = {
297 .description = "Conexant CX82310 USB ethernet",
298 .flags = FLAG_ETHER,
299 .bind = cx82310_bind,
300 .unbind = cx82310_unbind,
301 .rx_fixup = cx82310_rx_fixup,
302 .tx_fixup = cx82310_tx_fixup,
303};
304
305#define USB_DEVICE_CLASS(vend, prod, cl, sc, pr) \
306 .match_flags = USB_DEVICE_ID_MATCH_DEVICE | \
307 USB_DEVICE_ID_MATCH_DEV_INFO, \
308 .idVendor = (vend), \
309 .idProduct = (prod), \
310 .bDeviceClass = (cl), \
311 .bDeviceSubClass = (sc), \
312 .bDeviceProtocol = (pr)
313
314static const struct usb_device_id products[] = {
315 {
316 USB_DEVICE_CLASS(0x0572, 0xcb01, 0xff, 0, 0),
317 .driver_info = (unsigned long) &cx82310_info
318 },
319 { },
320};
321MODULE_DEVICE_TABLE(usb, products);
322
323static struct usb_driver cx82310_driver = {
324 .name = "cx82310_eth",
325 .id_table = products,
326 .probe = usbnet_probe,
327 .disconnect = usbnet_disconnect,
328 .suspend = usbnet_suspend,
329 .resume = usbnet_resume,
330};
331
332static int __init cx82310_init(void)
333{
334 return usb_register(&cx82310_driver);
335}
336module_init(cx82310_init);
337
338static void __exit cx82310_exit(void)
339{
340 usb_deregister(&cx82310_driver);
341}
342module_exit(cx82310_exit);
343
344MODULE_AUTHOR("Ondrej Zary");
345MODULE_DESCRIPTION("Conexant CX82310-based ADSL router USB ethernet driver");
346MODULE_LICENSE("GPL");
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
17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
18 */
19
20#include <linux/module.h>
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
29enum 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
38enum 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 */
62static 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 }
123end:
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
132static 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" */
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");
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
151 * packets with no header (and sometimes even empty URBs)
152 */
153 dev->net->hard_header_len = 0;
154 /* we can send at most 1514 bytes of data (+ 2-byte header) per URB */
155 dev->hard_mtu = CX82310_MTU + 2;
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;
185err:
186 kfree((void *)dev->partial_data);
187 return ret;
188}
189
190static 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 */
203static 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
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 */
273static 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
294static 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
303static const struct usb_device_id products[] = {
304 {
305 USB_DEVICE_AND_INTERFACE_INFO(0x0572, 0xcb01, 0xff, 0, 0),
306 .driver_info = (unsigned long) &cx82310_info
307 },
308 { },
309};
310MODULE_DEVICE_TABLE(usb, products);
311
312static 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,
319 .disable_hub_initiated_lpm = 1,
320};
321
322module_usb_driver(cx82310_driver);
323
324MODULE_AUTHOR("Ondrej Zary");
325MODULE_DESCRIPTION("Conexant CX82310-based ADSL router USB ethernet driver");
326MODULE_LICENSE("GPL");