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> | |
b29002a1 | 15 | #include <linux/module.h> |
9b39e9dd BN |
16 | #include <linux/device.h> |
17 | #include <linux/etherdevice.h> | |
18 | #include <linux/crc32.h> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
9b39e9dd BN |
20 | |
21 | #include "u_ether.h" | |
b29002a1 | 22 | #include "u_eem.h" |
9b39e9dd BN |
23 | |
24 | #define EEM_HLEN 2 | |
25 | ||
26 | /* | |
27 | * This function is a "CDC Ethernet Emulation Model" (CDC EEM) | |
28 | * Ethernet link. | |
29 | */ | |
30 | ||
9b39e9dd BN |
31 | struct f_eem { |
32 | struct gether port; | |
33 | u8 ctrl_id; | |
9b39e9dd BN |
34 | }; |
35 | ||
36 | static inline struct f_eem *func_to_eem(struct usb_function *f) | |
37 | { | |
38 | return container_of(f, struct f_eem, port.func); | |
39 | } | |
40 | ||
41 | /*-------------------------------------------------------------------------*/ | |
42 | ||
43 | /* interface descriptor: */ | |
44 | ||
b29002a1 | 45 | static struct usb_interface_descriptor eem_intf = { |
9b39e9dd BN |
46 | .bLength = sizeof eem_intf, |
47 | .bDescriptorType = USB_DT_INTERFACE, | |
48 | ||
49 | /* .bInterfaceNumber = DYNAMIC */ | |
50 | .bNumEndpoints = 2, | |
51 | .bInterfaceClass = USB_CLASS_COMM, | |
52 | .bInterfaceSubClass = USB_CDC_SUBCLASS_EEM, | |
53 | .bInterfaceProtocol = USB_CDC_PROTO_EEM, | |
54 | /* .iInterface = DYNAMIC */ | |
55 | }; | |
56 | ||
57 | /* full speed support: */ | |
58 | ||
b29002a1 | 59 | static struct usb_endpoint_descriptor eem_fs_in_desc = { |
9b39e9dd BN |
60 | .bLength = USB_DT_ENDPOINT_SIZE, |
61 | .bDescriptorType = USB_DT_ENDPOINT, | |
62 | ||
63 | .bEndpointAddress = USB_DIR_IN, | |
64 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
65 | }; | |
66 | ||
b29002a1 | 67 | static struct usb_endpoint_descriptor eem_fs_out_desc = { |
9b39e9dd BN |
68 | .bLength = USB_DT_ENDPOINT_SIZE, |
69 | .bDescriptorType = USB_DT_ENDPOINT, | |
70 | ||
71 | .bEndpointAddress = USB_DIR_OUT, | |
72 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
73 | }; | |
74 | ||
b29002a1 | 75 | static struct usb_descriptor_header *eem_fs_function[] = { |
9b39e9dd BN |
76 | /* CDC EEM control descriptors */ |
77 | (struct usb_descriptor_header *) &eem_intf, | |
78 | (struct usb_descriptor_header *) &eem_fs_in_desc, | |
79 | (struct usb_descriptor_header *) &eem_fs_out_desc, | |
80 | NULL, | |
81 | }; | |
82 | ||
83 | /* high speed support: */ | |
84 | ||
b29002a1 | 85 | static struct usb_endpoint_descriptor eem_hs_in_desc = { |
9b39e9dd BN |
86 | .bLength = USB_DT_ENDPOINT_SIZE, |
87 | .bDescriptorType = USB_DT_ENDPOINT, | |
88 | ||
89 | .bEndpointAddress = USB_DIR_IN, | |
90 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
91 | .wMaxPacketSize = cpu_to_le16(512), | |
92 | }; | |
93 | ||
b29002a1 | 94 | static struct usb_endpoint_descriptor eem_hs_out_desc = { |
9b39e9dd BN |
95 | .bLength = USB_DT_ENDPOINT_SIZE, |
96 | .bDescriptorType = USB_DT_ENDPOINT, | |
97 | ||
98 | .bEndpointAddress = USB_DIR_OUT, | |
99 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
100 | .wMaxPacketSize = cpu_to_le16(512), | |
101 | }; | |
102 | ||
b29002a1 | 103 | static struct usb_descriptor_header *eem_hs_function[] = { |
9b39e9dd BN |
104 | /* CDC EEM control descriptors */ |
105 | (struct usb_descriptor_header *) &eem_intf, | |
106 | (struct usb_descriptor_header *) &eem_hs_in_desc, | |
107 | (struct usb_descriptor_header *) &eem_hs_out_desc, | |
108 | NULL, | |
109 | }; | |
110 | ||
04617db7 PZ |
111 | /* super speed support: */ |
112 | ||
b29002a1 | 113 | static struct usb_endpoint_descriptor eem_ss_in_desc = { |
04617db7 PZ |
114 | .bLength = USB_DT_ENDPOINT_SIZE, |
115 | .bDescriptorType = USB_DT_ENDPOINT, | |
116 | ||
117 | .bEndpointAddress = USB_DIR_IN, | |
118 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
119 | .wMaxPacketSize = cpu_to_le16(1024), | |
120 | }; | |
121 | ||
b29002a1 | 122 | static struct usb_endpoint_descriptor eem_ss_out_desc = { |
04617db7 PZ |
123 | .bLength = USB_DT_ENDPOINT_SIZE, |
124 | .bDescriptorType = USB_DT_ENDPOINT, | |
125 | ||
126 | .bEndpointAddress = USB_DIR_OUT, | |
127 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
128 | .wMaxPacketSize = cpu_to_le16(1024), | |
129 | }; | |
130 | ||
b29002a1 | 131 | static struct usb_ss_ep_comp_descriptor eem_ss_bulk_comp_desc = { |
04617db7 PZ |
132 | .bLength = sizeof eem_ss_bulk_comp_desc, |
133 | .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, | |
134 | ||
135 | /* the following 2 values can be tweaked if necessary */ | |
136 | /* .bMaxBurst = 0, */ | |
137 | /* .bmAttributes = 0, */ | |
138 | }; | |
139 | ||
b29002a1 | 140 | static struct usb_descriptor_header *eem_ss_function[] = { |
04617db7 PZ |
141 | /* CDC EEM control descriptors */ |
142 | (struct usb_descriptor_header *) &eem_intf, | |
143 | (struct usb_descriptor_header *) &eem_ss_in_desc, | |
144 | (struct usb_descriptor_header *) &eem_ss_bulk_comp_desc, | |
145 | (struct usb_descriptor_header *) &eem_ss_out_desc, | |
146 | (struct usb_descriptor_header *) &eem_ss_bulk_comp_desc, | |
147 | NULL, | |
148 | }; | |
149 | ||
9b39e9dd BN |
150 | /* string descriptors: */ |
151 | ||
152 | static struct usb_string eem_string_defs[] = { | |
153 | [0].s = "CDC Ethernet Emulation Model (EEM)", | |
154 | { } /* end of list */ | |
155 | }; | |
156 | ||
157 | static struct usb_gadget_strings eem_string_table = { | |
158 | .language = 0x0409, /* en-us */ | |
159 | .strings = eem_string_defs, | |
160 | }; | |
161 | ||
162 | static struct usb_gadget_strings *eem_strings[] = { | |
163 | &eem_string_table, | |
164 | NULL, | |
165 | }; | |
166 | ||
167 | /*-------------------------------------------------------------------------*/ | |
168 | ||
169 | static int eem_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl) | |
170 | { | |
171 | struct usb_composite_dev *cdev = f->config->cdev; | |
172 | int value = -EOPNOTSUPP; | |
173 | u16 w_index = le16_to_cpu(ctrl->wIndex); | |
174 | u16 w_value = le16_to_cpu(ctrl->wValue); | |
175 | u16 w_length = le16_to_cpu(ctrl->wLength); | |
176 | ||
177 | DBG(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n", | |
178 | ctrl->bRequestType, ctrl->bRequest, | |
179 | w_value, w_index, w_length); | |
180 | ||
181 | /* device either stalls (value < 0) or reports success */ | |
182 | return value; | |
183 | } | |
184 | ||
185 | ||
186 | static int eem_set_alt(struct usb_function *f, unsigned intf, unsigned alt) | |
187 | { | |
188 | struct f_eem *eem = func_to_eem(f); | |
189 | struct usb_composite_dev *cdev = f->config->cdev; | |
190 | struct net_device *net; | |
191 | ||
192 | /* we know alt == 0, so this is an activation or a reset */ | |
193 | if (alt != 0) | |
194 | goto fail; | |
195 | ||
196 | if (intf == eem->ctrl_id) { | |
197 | ||
198 | if (eem->port.in_ep->driver_data) { | |
199 | DBG(cdev, "reset eem\n"); | |
200 | gether_disconnect(&eem->port); | |
201 | } | |
202 | ||
ea2a1df7 | 203 | if (!eem->port.in_ep->desc || !eem->port.out_ep->desc) { |
9b39e9dd | 204 | DBG(cdev, "init eem\n"); |
ea2a1df7 TB |
205 | if (config_ep_by_speed(cdev->gadget, f, |
206 | eem->port.in_ep) || | |
207 | config_ep_by_speed(cdev->gadget, f, | |
208 | eem->port.out_ep)) { | |
209 | eem->port.in_ep->desc = NULL; | |
210 | eem->port.out_ep->desc = NULL; | |
211 | goto fail; | |
212 | } | |
9b39e9dd BN |
213 | } |
214 | ||
215 | /* zlps should not occur because zero-length EEM packets | |
216 | * will be inserted in those cases where they would occur | |
217 | */ | |
218 | eem->port.is_zlp_ok = 1; | |
219 | eem->port.cdc_filter = DEFAULT_FILTER; | |
220 | DBG(cdev, "activate eem\n"); | |
221 | net = gether_connect(&eem->port); | |
222 | if (IS_ERR(net)) | |
223 | return PTR_ERR(net); | |
224 | } else | |
225 | goto fail; | |
226 | ||
227 | return 0; | |
228 | fail: | |
229 | return -EINVAL; | |
230 | } | |
231 | ||
232 | static void eem_disable(struct usb_function *f) | |
233 | { | |
234 | struct f_eem *eem = func_to_eem(f); | |
235 | struct usb_composite_dev *cdev = f->config->cdev; | |
236 | ||
237 | DBG(cdev, "eem deactivated\n"); | |
238 | ||
239 | if (eem->port.in_ep->driver_data) | |
240 | gether_disconnect(&eem->port); | |
241 | } | |
242 | ||
243 | /*-------------------------------------------------------------------------*/ | |
244 | ||
245 | /* EEM function driver setup/binding */ | |
246 | ||
b29002a1 | 247 | static int eem_bind(struct usb_configuration *c, struct usb_function *f) |
9b39e9dd BN |
248 | { |
249 | struct usb_composite_dev *cdev = c->cdev; | |
250 | struct f_eem *eem = func_to_eem(f); | |
251 | int status; | |
252 | struct usb_ep *ep; | |
253 | ||
b29002a1 AP |
254 | struct f_eem_opts *eem_opts; |
255 | ||
256 | eem_opts = container_of(f->fi, struct f_eem_opts, func_inst); | |
257 | /* | |
258 | * in drivers/usb/gadget/configfs.c:configfs_composite_bind() | |
259 | * configurations are bound in sequence with list_for_each_entry, | |
260 | * in each configuration its functions are bound in sequence | |
261 | * with list_for_each_entry, so we assume no race condition | |
262 | * with regard to eem_opts->bound access | |
263 | */ | |
264 | if (!eem_opts->bound) { | |
265 | gether_set_gadget(eem_opts->net, cdev->gadget); | |
266 | status = gether_register_netdev(eem_opts->net); | |
267 | if (status) | |
268 | return status; | |
269 | eem_opts->bound = true; | |
270 | } | |
b29002a1 AP |
271 | |
272 | /* maybe allocate device-global string IDs */ | |
273 | if (eem_string_defs[0].id == 0) { | |
274 | ||
275 | /* control interface label */ | |
276 | status = usb_string_id(c->cdev); | |
277 | if (status < 0) | |
278 | return status; | |
279 | eem_string_defs[0].id = status; | |
280 | eem_intf.iInterface = status; | |
281 | } | |
282 | ||
9b39e9dd BN |
283 | /* allocate instance-specific interface IDs */ |
284 | status = usb_interface_id(c, f); | |
285 | if (status < 0) | |
286 | goto fail; | |
287 | eem->ctrl_id = status; | |
288 | eem_intf.bInterfaceNumber = status; | |
289 | ||
290 | status = -ENODEV; | |
291 | ||
292 | /* allocate instance-specific endpoints */ | |
293 | ep = usb_ep_autoconfig(cdev->gadget, &eem_fs_in_desc); | |
294 | if (!ep) | |
295 | goto fail; | |
296 | eem->port.in_ep = ep; | |
297 | ep->driver_data = cdev; /* claim */ | |
298 | ||
299 | ep = usb_ep_autoconfig(cdev->gadget, &eem_fs_out_desc); | |
300 | if (!ep) | |
301 | goto fail; | |
302 | eem->port.out_ep = ep; | |
303 | ep->driver_data = cdev; /* claim */ | |
304 | ||
305 | status = -ENOMEM; | |
306 | ||
9b39e9dd BN |
307 | /* support all relevant hardware speeds... we expect that when |
308 | * hardware is dual speed, all bulk-capable endpoints work at | |
309 | * both speeds | |
310 | */ | |
10287bae SAS |
311 | eem_hs_in_desc.bEndpointAddress = eem_fs_in_desc.bEndpointAddress; |
312 | eem_hs_out_desc.bEndpointAddress = eem_fs_out_desc.bEndpointAddress; | |
9b39e9dd | 313 | |
10287bae SAS |
314 | eem_ss_in_desc.bEndpointAddress = eem_fs_in_desc.bEndpointAddress; |
315 | eem_ss_out_desc.bEndpointAddress = eem_fs_out_desc.bEndpointAddress; | |
04617db7 | 316 | |
10287bae SAS |
317 | status = usb_assign_descriptors(f, eem_fs_function, eem_hs_function, |
318 | eem_ss_function); | |
319 | if (status) | |
320 | goto fail; | |
04617db7 | 321 | |
9b39e9dd | 322 | DBG(cdev, "CDC Ethernet (EEM): %s speed IN/%s OUT/%s\n", |
04617db7 | 323 | gadget_is_superspeed(c->cdev->gadget) ? "super" : |
9b39e9dd BN |
324 | gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full", |
325 | eem->port.in_ep->name, eem->port.out_ep->name); | |
326 | return 0; | |
327 | ||
328 | fail: | |
10287bae | 329 | usb_free_all_descriptors(f); |
e79cc615 | 330 | if (eem->port.out_ep) |
9b39e9dd | 331 | eem->port.out_ep->driver_data = NULL; |
e79cc615 | 332 | if (eem->port.in_ep) |
9b39e9dd BN |
333 | eem->port.in_ep->driver_data = NULL; |
334 | ||
335 | ERROR(cdev, "%s: can't bind, err %d\n", f->name, status); | |
336 | ||
337 | return status; | |
338 | } | |
339 | ||
9b39e9dd BN |
340 | static void eem_cmd_complete(struct usb_ep *ep, struct usb_request *req) |
341 | { | |
505d1f69 YK |
342 | struct sk_buff *skb = (struct sk_buff *)req->context; |
343 | ||
344 | dev_kfree_skb_any(skb); | |
9b39e9dd BN |
345 | } |
346 | ||
347 | /* | |
348 | * Add the EEM header and ethernet checksum. | |
349 | * We currently do not attempt to put multiple ethernet frames | |
350 | * into a single USB transfer | |
351 | */ | |
352 | static struct sk_buff *eem_wrap(struct gether *port, struct sk_buff *skb) | |
353 | { | |
354 | struct sk_buff *skb2 = NULL; | |
355 | struct usb_ep *in = port->in_ep; | |
356 | int padlen = 0; | |
357 | u16 len = skb->len; | |
358 | ||
359 | if (!skb_cloned(skb)) { | |
360 | int headroom = skb_headroom(skb); | |
361 | int tailroom = skb_tailroom(skb); | |
362 | ||
363 | /* When (len + EEM_HLEN + ETH_FCS_LEN) % in->maxpacket) is 0, | |
364 | * stick two bytes of zero-length EEM packet on the end. | |
365 | */ | |
366 | if (((len + EEM_HLEN + ETH_FCS_LEN) % in->maxpacket) == 0) | |
367 | padlen += 2; | |
368 | ||
369 | if ((tailroom >= (ETH_FCS_LEN + padlen)) && | |
370 | (headroom >= EEM_HLEN)) | |
371 | goto done; | |
372 | } | |
373 | ||
374 | skb2 = skb_copy_expand(skb, EEM_HLEN, ETH_FCS_LEN + padlen, GFP_ATOMIC); | |
375 | dev_kfree_skb_any(skb); | |
376 | skb = skb2; | |
377 | if (!skb) | |
378 | return skb; | |
379 | ||
380 | done: | |
381 | /* use the "no CRC" option */ | |
382 | put_unaligned_be32(0xdeadbeef, skb_put(skb, 4)); | |
383 | ||
384 | /* EEM packet header format: | |
385 | * b0..13: length of ethernet frame | |
386 | * b14: bmCRC (0 == sentinel CRC) | |
387 | * b15: bmType (0 == data) | |
388 | */ | |
389 | len = skb->len; | |
31e5d4ab | 390 | put_unaligned_le16(len & 0x3FFF, skb_push(skb, 2)); |
9b39e9dd BN |
391 | |
392 | /* add a zero-length EEM packet, if needed */ | |
393 | if (padlen) | |
394 | put_unaligned_le16(0, skb_put(skb, 2)); | |
395 | ||
396 | return skb; | |
397 | } | |
398 | ||
399 | /* | |
400 | * Remove the EEM header. Note that there can be many EEM packets in a single | |
401 | * USB transfer, so we need to break them out and handle them independently. | |
402 | */ | |
403 | static int eem_unwrap(struct gether *port, | |
404 | struct sk_buff *skb, | |
405 | struct sk_buff_head *list) | |
406 | { | |
407 | struct usb_composite_dev *cdev = port->func.config->cdev; | |
408 | int status = 0; | |
409 | ||
410 | do { | |
411 | struct sk_buff *skb2; | |
412 | u16 header; | |
413 | u16 len = 0; | |
414 | ||
415 | if (skb->len < EEM_HLEN) { | |
416 | status = -EINVAL; | |
417 | DBG(cdev, "invalid EEM header\n"); | |
418 | goto error; | |
419 | } | |
420 | ||
421 | /* remove the EEM header */ | |
422 | header = get_unaligned_le16(skb->data); | |
423 | skb_pull(skb, EEM_HLEN); | |
424 | ||
425 | /* EEM packet header format: | |
426 | * b0..14: EEM type dependent (data or command) | |
427 | * b15: bmType (0 == data, 1 == command) | |
428 | */ | |
429 | if (header & BIT(15)) { | |
430 | struct usb_request *req = cdev->req; | |
431 | u16 bmEEMCmd; | |
432 | ||
433 | /* EEM command packet format: | |
434 | * b0..10: bmEEMCmdParam | |
435 | * b11..13: bmEEMCmd | |
436 | * b14: reserved (must be zero) | |
437 | * b15: bmType (1 == command) | |
438 | */ | |
439 | if (header & BIT(14)) | |
440 | continue; | |
441 | ||
442 | bmEEMCmd = (header >> 11) & 0x7; | |
443 | switch (bmEEMCmd) { | |
444 | case 0: /* echo */ | |
445 | len = header & 0x7FF; | |
446 | if (skb->len < len) { | |
447 | status = -EOVERFLOW; | |
448 | goto error; | |
449 | } | |
450 | ||
451 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
452 | if (unlikely(!skb2)) { | |
453 | DBG(cdev, "EEM echo response error\n"); | |
454 | goto next; | |
455 | } | |
456 | skb_trim(skb2, len); | |
457 | put_unaligned_le16(BIT(15) | BIT(11) | len, | |
458 | skb_push(skb2, 2)); | |
505d1f69 YK |
459 | skb_copy_bits(skb2, 0, req->buf, skb2->len); |
460 | req->length = skb2->len; | |
9b39e9dd BN |
461 | req->complete = eem_cmd_complete; |
462 | req->zero = 1; | |
505d1f69 | 463 | req->context = skb2; |
9b39e9dd BN |
464 | if (usb_ep_queue(port->in_ep, req, GFP_ATOMIC)) |
465 | DBG(cdev, "echo response queue fail\n"); | |
466 | break; | |
467 | ||
468 | case 1: /* echo response */ | |
469 | case 2: /* suspend hint */ | |
470 | case 3: /* response hint */ | |
471 | case 4: /* response complete hint */ | |
472 | case 5: /* tickle */ | |
473 | default: /* reserved */ | |
474 | continue; | |
475 | } | |
476 | } else { | |
477 | u32 crc, crc2; | |
478 | struct sk_buff *skb3; | |
479 | ||
480 | /* check for zero-length EEM packet */ | |
481 | if (header == 0) | |
482 | continue; | |
483 | ||
484 | /* EEM data packet format: | |
485 | * b0..13: length of ethernet frame | |
486 | * b14: bmCRC (0 == sentinel, 1 == calculated) | |
487 | * b15: bmType (0 == data) | |
488 | */ | |
489 | len = header & 0x3FFF; | |
490 | if ((skb->len < len) | |
491 | || (len < (ETH_HLEN + ETH_FCS_LEN))) { | |
492 | status = -EINVAL; | |
493 | goto error; | |
494 | } | |
495 | ||
496 | /* validate CRC */ | |
9b39e9dd BN |
497 | if (header & BIT(14)) { |
498 | crc = get_unaligned_le32(skb->data + len | |
499 | - ETH_FCS_LEN); | |
500 | crc2 = ~crc32_le(~0, | |
03ab7461 | 501 | skb->data, len - ETH_FCS_LEN); |
9b39e9dd BN |
502 | } else { |
503 | crc = get_unaligned_be32(skb->data + len | |
504 | - ETH_FCS_LEN); | |
505 | crc2 = 0xdeadbeef; | |
506 | } | |
507 | if (crc != crc2) { | |
508 | DBG(cdev, "invalid EEM CRC\n"); | |
509 | goto next; | |
510 | } | |
511 | ||
512 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
513 | if (unlikely(!skb2)) { | |
514 | DBG(cdev, "unable to unframe EEM packet\n"); | |
515 | continue; | |
516 | } | |
517 | skb_trim(skb2, len - ETH_FCS_LEN); | |
518 | ||
519 | skb3 = skb_copy_expand(skb2, | |
520 | NET_IP_ALIGN, | |
521 | 0, | |
522 | GFP_ATOMIC); | |
523 | if (unlikely(!skb3)) { | |
524 | DBG(cdev, "unable to realign EEM packet\n"); | |
525 | dev_kfree_skb_any(skb2); | |
526 | continue; | |
527 | } | |
528 | dev_kfree_skb_any(skb2); | |
529 | skb_queue_tail(list, skb3); | |
530 | } | |
531 | next: | |
532 | skb_pull(skb, len); | |
533 | } while (skb->len); | |
534 | ||
535 | error: | |
536 | dev_kfree_skb_any(skb); | |
537 | return status; | |
538 | } | |
539 | ||
b29002a1 AP |
540 | static void eem_free_inst(struct usb_function_instance *f) |
541 | { | |
542 | struct f_eem_opts *opts; | |
543 | ||
544 | opts = container_of(f, struct f_eem_opts, func_inst); | |
545 | if (opts->bound) | |
546 | gether_cleanup(netdev_priv(opts->net)); | |
547 | else | |
548 | free_netdev(opts->net); | |
549 | kfree(opts); | |
550 | } | |
551 | ||
552 | static struct usb_function_instance *eem_alloc_inst(void) | |
553 | { | |
554 | struct f_eem_opts *opts; | |
555 | ||
556 | opts = kzalloc(sizeof(*opts), GFP_KERNEL); | |
557 | if (!opts) | |
558 | return ERR_PTR(-ENOMEM); | |
559 | opts->func_inst.free_func_inst = eem_free_inst; | |
560 | opts->net = gether_setup_default(); | |
561 | if (IS_ERR(opts->net)) | |
562 | return ERR_CAST(opts->net); | |
563 | ||
564 | return &opts->func_inst; | |
565 | } | |
566 | ||
567 | static void eem_free(struct usb_function *f) | |
568 | { | |
569 | struct f_eem *eem; | |
570 | ||
571 | eem = func_to_eem(f); | |
572 | kfree(eem); | |
573 | } | |
574 | ||
575 | static void eem_unbind(struct usb_configuration *c, struct usb_function *f) | |
576 | { | |
577 | DBG(c->cdev, "eem unbind\n"); | |
578 | ||
579 | usb_free_all_descriptors(f); | |
580 | } | |
581 | ||
582 | struct usb_function *eem_alloc(struct usb_function_instance *fi) | |
583 | { | |
584 | struct f_eem *eem; | |
585 | struct f_eem_opts *opts; | |
586 | ||
587 | /* allocate and initialize one new instance */ | |
588 | eem = kzalloc(sizeof(*eem), GFP_KERNEL); | |
589 | if (!eem) | |
590 | return ERR_PTR(-ENOMEM); | |
591 | ||
592 | opts = container_of(fi, struct f_eem_opts, func_inst); | |
593 | ||
594 | eem->port.ioport = netdev_priv(opts->net); | |
595 | eem->port.cdc_filter = DEFAULT_FILTER; | |
596 | ||
597 | eem->port.func.name = "cdc_eem"; | |
598 | eem->port.func.strings = eem_strings; | |
599 | /* descriptors are per-instance copies */ | |
600 | eem->port.func.bind = eem_bind; | |
601 | eem->port.func.unbind = eem_unbind; | |
602 | eem->port.func.set_alt = eem_set_alt; | |
603 | eem->port.func.setup = eem_setup; | |
604 | eem->port.func.disable = eem_disable; | |
605 | eem->port.func.free_func = eem_free; | |
606 | eem->port.wrap = eem_wrap; | |
607 | eem->port.unwrap = eem_unwrap; | |
608 | eem->port.header_len = EEM_HLEN; | |
609 | ||
610 | return &eem->port.func; | |
611 | } | |
612 | ||
613 | DECLARE_USB_FUNCTION_INIT(eem, eem_alloc_inst, eem_alloc); | |
614 | MODULE_LICENSE("GPL"); | |
615 | MODULE_AUTHOR("David Brownell"); |