Commit | Line | Data |
---|---|---|
9b39e9dd BN |
1 | /* |
2 | * f_eem.c -- USB CDC Ethernet (EEM) link function driver | |
3 | * | |
4 | * Copyright (C) 2003-2005,2008 David Brownell | |
5 | * Copyright (C) 2008 Nokia Corporation | |
6 | * Copyright (C) 2009 EF Johnson Technologies | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
9b39e9dd BN |
12 | */ |
13 | ||
14 | #include <linux/kernel.h> | |
15 | #include <linux/device.h> | |
16 | #include <linux/etherdevice.h> | |
17 | #include <linux/crc32.h> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
9b39e9dd BN |
19 | |
20 | #include "u_ether.h" | |
21 | ||
22 | #define EEM_HLEN 2 | |
23 | ||
24 | /* | |
25 | * This function is a "CDC Ethernet Emulation Model" (CDC EEM) | |
26 | * Ethernet link. | |
27 | */ | |
28 | ||
9b39e9dd BN |
29 | struct f_eem { |
30 | struct gether port; | |
31 | u8 ctrl_id; | |
9b39e9dd BN |
32 | }; |
33 | ||
34 | static inline struct f_eem *func_to_eem(struct usb_function *f) | |
35 | { | |
36 | return container_of(f, struct f_eem, port.func); | |
37 | } | |
38 | ||
39 | /*-------------------------------------------------------------------------*/ | |
40 | ||
41 | /* interface descriptor: */ | |
42 | ||
6fa3eb70 | 43 | static struct usb_interface_descriptor eem_intf = { |
9b39e9dd BN |
44 | .bLength = sizeof eem_intf, |
45 | .bDescriptorType = USB_DT_INTERFACE, | |
46 | ||
47 | /* .bInterfaceNumber = DYNAMIC */ | |
48 | .bNumEndpoints = 2, | |
49 | .bInterfaceClass = USB_CLASS_COMM, | |
50 | .bInterfaceSubClass = USB_CDC_SUBCLASS_EEM, | |
51 | .bInterfaceProtocol = USB_CDC_PROTO_EEM, | |
52 | /* .iInterface = DYNAMIC */ | |
53 | }; | |
54 | ||
55 | /* full speed support: */ | |
56 | ||
6fa3eb70 | 57 | static struct usb_endpoint_descriptor eem_fs_in_desc = { |
9b39e9dd BN |
58 | .bLength = USB_DT_ENDPOINT_SIZE, |
59 | .bDescriptorType = USB_DT_ENDPOINT, | |
60 | ||
61 | .bEndpointAddress = USB_DIR_IN, | |
62 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
63 | }; | |
64 | ||
6fa3eb70 | 65 | static struct usb_endpoint_descriptor eem_fs_out_desc = { |
9b39e9dd BN |
66 | .bLength = USB_DT_ENDPOINT_SIZE, |
67 | .bDescriptorType = USB_DT_ENDPOINT, | |
68 | ||
69 | .bEndpointAddress = USB_DIR_OUT, | |
70 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
71 | }; | |
72 | ||
6fa3eb70 | 73 | static struct usb_descriptor_header *eem_fs_function[] = { |
9b39e9dd BN |
74 | /* CDC EEM control descriptors */ |
75 | (struct usb_descriptor_header *) &eem_intf, | |
76 | (struct usb_descriptor_header *) &eem_fs_in_desc, | |
77 | (struct usb_descriptor_header *) &eem_fs_out_desc, | |
78 | NULL, | |
79 | }; | |
80 | ||
81 | /* high speed support: */ | |
82 | ||
6fa3eb70 | 83 | static struct usb_endpoint_descriptor eem_hs_in_desc = { |
9b39e9dd BN |
84 | .bLength = USB_DT_ENDPOINT_SIZE, |
85 | .bDescriptorType = USB_DT_ENDPOINT, | |
86 | ||
87 | .bEndpointAddress = USB_DIR_IN, | |
88 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
89 | .wMaxPacketSize = cpu_to_le16(512), | |
90 | }; | |
91 | ||
6fa3eb70 | 92 | static struct usb_endpoint_descriptor eem_hs_out_desc = { |
9b39e9dd BN |
93 | .bLength = USB_DT_ENDPOINT_SIZE, |
94 | .bDescriptorType = USB_DT_ENDPOINT, | |
95 | ||
96 | .bEndpointAddress = USB_DIR_OUT, | |
97 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
98 | .wMaxPacketSize = cpu_to_le16(512), | |
99 | }; | |
100 | ||
6fa3eb70 | 101 | static struct usb_descriptor_header *eem_hs_function[] = { |
9b39e9dd BN |
102 | /* CDC EEM control descriptors */ |
103 | (struct usb_descriptor_header *) &eem_intf, | |
104 | (struct usb_descriptor_header *) &eem_hs_in_desc, | |
105 | (struct usb_descriptor_header *) &eem_hs_out_desc, | |
106 | NULL, | |
107 | }; | |
108 | ||
04617db7 PZ |
109 | /* super speed support: */ |
110 | ||
6fa3eb70 | 111 | static struct usb_endpoint_descriptor eem_ss_in_desc = { |
04617db7 PZ |
112 | .bLength = USB_DT_ENDPOINT_SIZE, |
113 | .bDescriptorType = USB_DT_ENDPOINT, | |
114 | ||
115 | .bEndpointAddress = USB_DIR_IN, | |
116 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
117 | .wMaxPacketSize = cpu_to_le16(1024), | |
118 | }; | |
119 | ||
6fa3eb70 | 120 | static struct usb_endpoint_descriptor eem_ss_out_desc = { |
04617db7 PZ |
121 | .bLength = USB_DT_ENDPOINT_SIZE, |
122 | .bDescriptorType = USB_DT_ENDPOINT, | |
123 | ||
124 | .bEndpointAddress = USB_DIR_OUT, | |
125 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
126 | .wMaxPacketSize = cpu_to_le16(1024), | |
127 | }; | |
128 | ||
6fa3eb70 | 129 | static struct usb_ss_ep_comp_descriptor eem_ss_bulk_comp_desc = { |
04617db7 PZ |
130 | .bLength = sizeof eem_ss_bulk_comp_desc, |
131 | .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, | |
132 | ||
133 | /* the following 2 values can be tweaked if necessary */ | |
134 | /* .bMaxBurst = 0, */ | |
135 | /* .bmAttributes = 0, */ | |
136 | }; | |
137 | ||
6fa3eb70 | 138 | static struct usb_descriptor_header *eem_ss_function[] = { |
04617db7 PZ |
139 | /* CDC EEM control descriptors */ |
140 | (struct usb_descriptor_header *) &eem_intf, | |
141 | (struct usb_descriptor_header *) &eem_ss_in_desc, | |
142 | (struct usb_descriptor_header *) &eem_ss_bulk_comp_desc, | |
143 | (struct usb_descriptor_header *) &eem_ss_out_desc, | |
144 | (struct usb_descriptor_header *) &eem_ss_bulk_comp_desc, | |
145 | NULL, | |
146 | }; | |
147 | ||
9b39e9dd BN |
148 | /* string descriptors: */ |
149 | ||
150 | static struct usb_string eem_string_defs[] = { | |
151 | [0].s = "CDC Ethernet Emulation Model (EEM)", | |
152 | { } /* end of list */ | |
153 | }; | |
154 | ||
155 | static struct usb_gadget_strings eem_string_table = { | |
156 | .language = 0x0409, /* en-us */ | |
157 | .strings = eem_string_defs, | |
158 | }; | |
159 | ||
160 | static struct usb_gadget_strings *eem_strings[] = { | |
161 | &eem_string_table, | |
162 | NULL, | |
163 | }; | |
164 | ||
165 | /*-------------------------------------------------------------------------*/ | |
166 | ||
167 | static int eem_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl) | |
168 | { | |
169 | struct usb_composite_dev *cdev = f->config->cdev; | |
170 | int value = -EOPNOTSUPP; | |
171 | u16 w_index = le16_to_cpu(ctrl->wIndex); | |
172 | u16 w_value = le16_to_cpu(ctrl->wValue); | |
173 | u16 w_length = le16_to_cpu(ctrl->wLength); | |
174 | ||
175 | DBG(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n", | |
176 | ctrl->bRequestType, ctrl->bRequest, | |
177 | w_value, w_index, w_length); | |
178 | ||
179 | /* device either stalls (value < 0) or reports success */ | |
180 | return value; | |
181 | } | |
182 | ||
183 | ||
184 | static int eem_set_alt(struct usb_function *f, unsigned intf, unsigned alt) | |
185 | { | |
186 | struct f_eem *eem = func_to_eem(f); | |
187 | struct usb_composite_dev *cdev = f->config->cdev; | |
188 | struct net_device *net; | |
189 | ||
190 | /* we know alt == 0, so this is an activation or a reset */ | |
191 | if (alt != 0) | |
192 | goto fail; | |
193 | ||
194 | if (intf == eem->ctrl_id) { | |
195 | ||
196 | if (eem->port.in_ep->driver_data) { | |
197 | DBG(cdev, "reset eem\n"); | |
198 | gether_disconnect(&eem->port); | |
199 | } | |
200 | ||
ea2a1df7 | 201 | if (!eem->port.in_ep->desc || !eem->port.out_ep->desc) { |
9b39e9dd | 202 | DBG(cdev, "init eem\n"); |
ea2a1df7 TB |
203 | if (config_ep_by_speed(cdev->gadget, f, |
204 | eem->port.in_ep) || | |
205 | config_ep_by_speed(cdev->gadget, f, | |
206 | eem->port.out_ep)) { | |
207 | eem->port.in_ep->desc = NULL; | |
208 | eem->port.out_ep->desc = NULL; | |
209 | goto fail; | |
210 | } | |
9b39e9dd BN |
211 | } |
212 | ||
213 | /* zlps should not occur because zero-length EEM packets | |
214 | * will be inserted in those cases where they would occur | |
215 | */ | |
216 | eem->port.is_zlp_ok = 1; | |
217 | eem->port.cdc_filter = DEFAULT_FILTER; | |
218 | DBG(cdev, "activate eem\n"); | |
219 | net = gether_connect(&eem->port); | |
220 | if (IS_ERR(net)) | |
221 | return PTR_ERR(net); | |
222 | } else | |
223 | goto fail; | |
224 | ||
225 | return 0; | |
226 | fail: | |
227 | return -EINVAL; | |
228 | } | |
229 | ||
230 | static void eem_disable(struct usb_function *f) | |
231 | { | |
232 | struct f_eem *eem = func_to_eem(f); | |
233 | struct usb_composite_dev *cdev = f->config->cdev; | |
234 | ||
235 | DBG(cdev, "eem deactivated\n"); | |
236 | ||
237 | if (eem->port.in_ep->driver_data) | |
238 | gether_disconnect(&eem->port); | |
239 | } | |
240 | ||
241 | /*-------------------------------------------------------------------------*/ | |
242 | ||
243 | /* EEM function driver setup/binding */ | |
244 | ||
6fa3eb70 | 245 | static int |
9b39e9dd BN |
246 | eem_bind(struct usb_configuration *c, struct usb_function *f) |
247 | { | |
248 | struct usb_composite_dev *cdev = c->cdev; | |
249 | struct f_eem *eem = func_to_eem(f); | |
250 | int status; | |
251 | struct usb_ep *ep; | |
252 | ||
253 | /* allocate instance-specific interface IDs */ | |
254 | status = usb_interface_id(c, f); | |
255 | if (status < 0) | |
256 | goto fail; | |
257 | eem->ctrl_id = status; | |
258 | eem_intf.bInterfaceNumber = status; | |
259 | ||
260 | status = -ENODEV; | |
261 | ||
262 | /* allocate instance-specific endpoints */ | |
263 | ep = usb_ep_autoconfig(cdev->gadget, &eem_fs_in_desc); | |
264 | if (!ep) | |
265 | goto fail; | |
266 | eem->port.in_ep = ep; | |
267 | ep->driver_data = cdev; /* claim */ | |
268 | ||
269 | ep = usb_ep_autoconfig(cdev->gadget, &eem_fs_out_desc); | |
270 | if (!ep) | |
271 | goto fail; | |
272 | eem->port.out_ep = ep; | |
273 | ep->driver_data = cdev; /* claim */ | |
274 | ||
275 | status = -ENOMEM; | |
276 | ||
9b39e9dd BN |
277 | /* support all relevant hardware speeds... we expect that when |
278 | * hardware is dual speed, all bulk-capable endpoints work at | |
279 | * both speeds | |
280 | */ | |
10287bae SAS |
281 | eem_hs_in_desc.bEndpointAddress = eem_fs_in_desc.bEndpointAddress; |
282 | eem_hs_out_desc.bEndpointAddress = eem_fs_out_desc.bEndpointAddress; | |
9b39e9dd | 283 | |
10287bae SAS |
284 | eem_ss_in_desc.bEndpointAddress = eem_fs_in_desc.bEndpointAddress; |
285 | eem_ss_out_desc.bEndpointAddress = eem_fs_out_desc.bEndpointAddress; | |
04617db7 | 286 | |
10287bae SAS |
287 | status = usb_assign_descriptors(f, eem_fs_function, eem_hs_function, |
288 | eem_ss_function); | |
289 | if (status) | |
290 | goto fail; | |
04617db7 | 291 | |
9b39e9dd | 292 | DBG(cdev, "CDC Ethernet (EEM): %s speed IN/%s OUT/%s\n", |
04617db7 | 293 | gadget_is_superspeed(c->cdev->gadget) ? "super" : |
9b39e9dd BN |
294 | gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full", |
295 | eem->port.in_ep->name, eem->port.out_ep->name); | |
296 | return 0; | |
297 | ||
298 | fail: | |
10287bae | 299 | usb_free_all_descriptors(f); |
e79cc615 | 300 | if (eem->port.out_ep) |
9b39e9dd | 301 | eem->port.out_ep->driver_data = NULL; |
e79cc615 | 302 | if (eem->port.in_ep) |
9b39e9dd BN |
303 | eem->port.in_ep->driver_data = NULL; |
304 | ||
305 | ERROR(cdev, "%s: can't bind, err %d\n", f->name, status); | |
306 | ||
307 | return status; | |
308 | } | |
309 | ||
310 | static void | |
311 | eem_unbind(struct usb_configuration *c, struct usb_function *f) | |
312 | { | |
313 | struct f_eem *eem = func_to_eem(f); | |
314 | ||
315 | DBG(c->cdev, "eem unbind\n"); | |
316 | ||
10287bae | 317 | usb_free_all_descriptors(f); |
9b39e9dd BN |
318 | kfree(eem); |
319 | } | |
320 | ||
321 | static void eem_cmd_complete(struct usb_ep *ep, struct usb_request *req) | |
322 | { | |
505d1f69 YK |
323 | struct sk_buff *skb = (struct sk_buff *)req->context; |
324 | ||
325 | dev_kfree_skb_any(skb); | |
9b39e9dd BN |
326 | } |
327 | ||
328 | /* | |
329 | * Add the EEM header and ethernet checksum. | |
330 | * We currently do not attempt to put multiple ethernet frames | |
331 | * into a single USB transfer | |
332 | */ | |
333 | static struct sk_buff *eem_wrap(struct gether *port, struct sk_buff *skb) | |
334 | { | |
335 | struct sk_buff *skb2 = NULL; | |
336 | struct usb_ep *in = port->in_ep; | |
337 | int padlen = 0; | |
338 | u16 len = skb->len; | |
339 | ||
340 | if (!skb_cloned(skb)) { | |
341 | int headroom = skb_headroom(skb); | |
342 | int tailroom = skb_tailroom(skb); | |
343 | ||
344 | /* When (len + EEM_HLEN + ETH_FCS_LEN) % in->maxpacket) is 0, | |
345 | * stick two bytes of zero-length EEM packet on the end. | |
346 | */ | |
347 | if (((len + EEM_HLEN + ETH_FCS_LEN) % in->maxpacket) == 0) | |
348 | padlen += 2; | |
349 | ||
350 | if ((tailroom >= (ETH_FCS_LEN + padlen)) && | |
351 | (headroom >= EEM_HLEN)) | |
352 | goto done; | |
353 | } | |
354 | ||
355 | skb2 = skb_copy_expand(skb, EEM_HLEN, ETH_FCS_LEN + padlen, GFP_ATOMIC); | |
356 | dev_kfree_skb_any(skb); | |
357 | skb = skb2; | |
358 | if (!skb) | |
359 | return skb; | |
360 | ||
361 | done: | |
362 | /* use the "no CRC" option */ | |
363 | put_unaligned_be32(0xdeadbeef, skb_put(skb, 4)); | |
364 | ||
365 | /* EEM packet header format: | |
366 | * b0..13: length of ethernet frame | |
367 | * b14: bmCRC (0 == sentinel CRC) | |
368 | * b15: bmType (0 == data) | |
369 | */ | |
370 | len = skb->len; | |
31e5d4ab | 371 | put_unaligned_le16(len & 0x3FFF, skb_push(skb, 2)); |
9b39e9dd BN |
372 | |
373 | /* add a zero-length EEM packet, if needed */ | |
374 | if (padlen) | |
375 | put_unaligned_le16(0, skb_put(skb, 2)); | |
376 | ||
377 | return skb; | |
378 | } | |
379 | ||
380 | /* | |
381 | * Remove the EEM header. Note that there can be many EEM packets in a single | |
382 | * USB transfer, so we need to break them out and handle them independently. | |
383 | */ | |
384 | static int eem_unwrap(struct gether *port, | |
385 | struct sk_buff *skb, | |
386 | struct sk_buff_head *list) | |
387 | { | |
388 | struct usb_composite_dev *cdev = port->func.config->cdev; | |
389 | int status = 0; | |
390 | ||
391 | do { | |
392 | struct sk_buff *skb2; | |
393 | u16 header; | |
394 | u16 len = 0; | |
395 | ||
396 | if (skb->len < EEM_HLEN) { | |
397 | status = -EINVAL; | |
398 | DBG(cdev, "invalid EEM header\n"); | |
399 | goto error; | |
400 | } | |
401 | ||
402 | /* remove the EEM header */ | |
403 | header = get_unaligned_le16(skb->data); | |
404 | skb_pull(skb, EEM_HLEN); | |
405 | ||
406 | /* EEM packet header format: | |
407 | * b0..14: EEM type dependent (data or command) | |
408 | * b15: bmType (0 == data, 1 == command) | |
409 | */ | |
410 | if (header & BIT(15)) { | |
411 | struct usb_request *req = cdev->req; | |
412 | u16 bmEEMCmd; | |
413 | ||
414 | /* EEM command packet format: | |
415 | * b0..10: bmEEMCmdParam | |
416 | * b11..13: bmEEMCmd | |
417 | * b14: reserved (must be zero) | |
418 | * b15: bmType (1 == command) | |
419 | */ | |
420 | if (header & BIT(14)) | |
421 | continue; | |
422 | ||
423 | bmEEMCmd = (header >> 11) & 0x7; | |
424 | switch (bmEEMCmd) { | |
425 | case 0: /* echo */ | |
426 | len = header & 0x7FF; | |
427 | if (skb->len < len) { | |
428 | status = -EOVERFLOW; | |
429 | goto error; | |
430 | } | |
431 | ||
432 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
433 | if (unlikely(!skb2)) { | |
434 | DBG(cdev, "EEM echo response error\n"); | |
435 | goto next; | |
436 | } | |
437 | skb_trim(skb2, len); | |
438 | put_unaligned_le16(BIT(15) | BIT(11) | len, | |
439 | skb_push(skb2, 2)); | |
505d1f69 YK |
440 | skb_copy_bits(skb2, 0, req->buf, skb2->len); |
441 | req->length = skb2->len; | |
9b39e9dd BN |
442 | req->complete = eem_cmd_complete; |
443 | req->zero = 1; | |
505d1f69 | 444 | req->context = skb2; |
9b39e9dd BN |
445 | if (usb_ep_queue(port->in_ep, req, GFP_ATOMIC)) |
446 | DBG(cdev, "echo response queue fail\n"); | |
447 | break; | |
448 | ||
449 | case 1: /* echo response */ | |
450 | case 2: /* suspend hint */ | |
451 | case 3: /* response hint */ | |
452 | case 4: /* response complete hint */ | |
453 | case 5: /* tickle */ | |
454 | default: /* reserved */ | |
455 | continue; | |
456 | } | |
457 | } else { | |
458 | u32 crc, crc2; | |
459 | struct sk_buff *skb3; | |
460 | ||
461 | /* check for zero-length EEM packet */ | |
462 | if (header == 0) | |
463 | continue; | |
464 | ||
465 | /* EEM data packet format: | |
466 | * b0..13: length of ethernet frame | |
467 | * b14: bmCRC (0 == sentinel, 1 == calculated) | |
468 | * b15: bmType (0 == data) | |
469 | */ | |
470 | len = header & 0x3FFF; | |
471 | if ((skb->len < len) | |
472 | || (len < (ETH_HLEN + ETH_FCS_LEN))) { | |
473 | status = -EINVAL; | |
474 | goto error; | |
475 | } | |
476 | ||
477 | /* validate CRC */ | |
9b39e9dd BN |
478 | if (header & BIT(14)) { |
479 | crc = get_unaligned_le32(skb->data + len | |
480 | - ETH_FCS_LEN); | |
481 | crc2 = ~crc32_le(~0, | |
03ab7461 | 482 | skb->data, len - ETH_FCS_LEN); |
9b39e9dd BN |
483 | } else { |
484 | crc = get_unaligned_be32(skb->data + len | |
485 | - ETH_FCS_LEN); | |
486 | crc2 = 0xdeadbeef; | |
487 | } | |
488 | if (crc != crc2) { | |
489 | DBG(cdev, "invalid EEM CRC\n"); | |
490 | goto next; | |
491 | } | |
492 | ||
493 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
494 | if (unlikely(!skb2)) { | |
495 | DBG(cdev, "unable to unframe EEM packet\n"); | |
496 | continue; | |
497 | } | |
498 | skb_trim(skb2, len - ETH_FCS_LEN); | |
499 | ||
500 | skb3 = skb_copy_expand(skb2, | |
501 | NET_IP_ALIGN, | |
502 | 0, | |
503 | GFP_ATOMIC); | |
504 | if (unlikely(!skb3)) { | |
505 | DBG(cdev, "unable to realign EEM packet\n"); | |
506 | dev_kfree_skb_any(skb2); | |
507 | continue; | |
508 | } | |
509 | dev_kfree_skb_any(skb2); | |
510 | skb_queue_tail(list, skb3); | |
511 | } | |
512 | next: | |
513 | skb_pull(skb, len); | |
514 | } while (skb->len); | |
515 | ||
516 | error: | |
517 | dev_kfree_skb_any(skb); | |
518 | return status; | |
519 | } | |
520 | ||
521 | /** | |
522 | * eem_bind_config - add CDC Ethernet (EEM) network link to a configuration | |
523 | * @c: the configuration to support the network link | |
524 | * Context: single threaded during gadget setup | |
525 | * | |
526 | * Returns zero on success, else negative errno. | |
527 | * | |
528 | * Caller must have called @gether_setup(). Caller is also responsible | |
529 | * for calling @gether_cleanup() before module unload. | |
530 | */ | |
6fa3eb70 | 531 | int eem_bind_config(struct usb_configuration *c, struct eth_dev *dev) |
9b39e9dd BN |
532 | { |
533 | struct f_eem *eem; | |
534 | int status; | |
535 | ||
536 | /* maybe allocate device-global string IDs */ | |
537 | if (eem_string_defs[0].id == 0) { | |
538 | ||
539 | /* control interface label */ | |
540 | status = usb_string_id(c->cdev); | |
541 | if (status < 0) | |
542 | return status; | |
543 | eem_string_defs[0].id = status; | |
544 | eem_intf.iInterface = status; | |
545 | } | |
546 | ||
547 | /* allocate and initialize one new instance */ | |
548 | eem = kzalloc(sizeof *eem, GFP_KERNEL); | |
549 | if (!eem) | |
550 | return -ENOMEM; | |
551 | ||
d6a01439 | 552 | eem->port.ioport = dev; |
9b39e9dd BN |
553 | eem->port.cdc_filter = DEFAULT_FILTER; |
554 | ||
555 | eem->port.func.name = "cdc_eem"; | |
556 | eem->port.func.strings = eem_strings; | |
557 | /* descriptors are per-instance copies */ | |
558 | eem->port.func.bind = eem_bind; | |
559 | eem->port.func.unbind = eem_unbind; | |
560 | eem->port.func.set_alt = eem_set_alt; | |
561 | eem->port.func.setup = eem_setup; | |
562 | eem->port.func.disable = eem_disable; | |
563 | eem->port.wrap = eem_wrap; | |
564 | eem->port.unwrap = eem_unwrap; | |
565 | eem->port.header_len = EEM_HLEN; | |
566 | ||
567 | status = usb_add_function(c, &eem->port.func); | |
568 | if (status) | |
569 | kfree(eem); | |
570 | return status; | |
571 | } | |
572 |