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Commit | Line | Data |
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5fd54ace | 1 | // SPDX-License-Identifier: GPL-2.0+ |
9b39e9dd BN |
2 | /* |
3 | * f_eem.c -- USB CDC Ethernet (EEM) link function driver | |
4 | * | |
5 | * Copyright (C) 2003-2005,2008 David Brownell | |
6 | * Copyright (C) 2008 Nokia Corporation | |
7 | * Copyright (C) 2009 EF Johnson Technologies | |
9b39e9dd BN |
8 | */ |
9 | ||
10 | #include <linux/kernel.h> | |
b29002a1 | 11 | #include <linux/module.h> |
9b39e9dd BN |
12 | #include <linux/device.h> |
13 | #include <linux/etherdevice.h> | |
14 | #include <linux/crc32.h> | |
5a0e3ad6 | 15 | #include <linux/slab.h> |
9b39e9dd BN |
16 | |
17 | #include "u_ether.h" | |
17b80976 | 18 | #include "u_ether_configfs.h" |
b29002a1 | 19 | #include "u_eem.h" |
9b39e9dd BN |
20 | |
21 | #define EEM_HLEN 2 | |
22 | ||
23 | /* | |
24 | * This function is a "CDC Ethernet Emulation Model" (CDC EEM) | |
25 | * Ethernet link. | |
26 | */ | |
27 | ||
9b39e9dd BN |
28 | struct f_eem { |
29 | struct gether port; | |
30 | u8 ctrl_id; | |
9b39e9dd BN |
31 | }; |
32 | ||
33 | static inline struct f_eem *func_to_eem(struct usb_function *f) | |
34 | { | |
35 | return container_of(f, struct f_eem, port.func); | |
36 | } | |
37 | ||
38 | /*-------------------------------------------------------------------------*/ | |
39 | ||
40 | /* interface descriptor: */ | |
41 | ||
b29002a1 | 42 | static struct usb_interface_descriptor eem_intf = { |
9b39e9dd BN |
43 | .bLength = sizeof eem_intf, |
44 | .bDescriptorType = USB_DT_INTERFACE, | |
45 | ||
46 | /* .bInterfaceNumber = DYNAMIC */ | |
47 | .bNumEndpoints = 2, | |
48 | .bInterfaceClass = USB_CLASS_COMM, | |
49 | .bInterfaceSubClass = USB_CDC_SUBCLASS_EEM, | |
50 | .bInterfaceProtocol = USB_CDC_PROTO_EEM, | |
51 | /* .iInterface = DYNAMIC */ | |
52 | }; | |
53 | ||
54 | /* full speed support: */ | |
55 | ||
b29002a1 | 56 | static struct usb_endpoint_descriptor eem_fs_in_desc = { |
9b39e9dd BN |
57 | .bLength = USB_DT_ENDPOINT_SIZE, |
58 | .bDescriptorType = USB_DT_ENDPOINT, | |
59 | ||
60 | .bEndpointAddress = USB_DIR_IN, | |
61 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
62 | }; | |
63 | ||
b29002a1 | 64 | static struct usb_endpoint_descriptor eem_fs_out_desc = { |
9b39e9dd BN |
65 | .bLength = USB_DT_ENDPOINT_SIZE, |
66 | .bDescriptorType = USB_DT_ENDPOINT, | |
67 | ||
68 | .bEndpointAddress = USB_DIR_OUT, | |
69 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
70 | }; | |
71 | ||
b29002a1 | 72 | static struct usb_descriptor_header *eem_fs_function[] = { |
9b39e9dd BN |
73 | /* CDC EEM control descriptors */ |
74 | (struct usb_descriptor_header *) &eem_intf, | |
75 | (struct usb_descriptor_header *) &eem_fs_in_desc, | |
76 | (struct usb_descriptor_header *) &eem_fs_out_desc, | |
77 | NULL, | |
78 | }; | |
79 | ||
80 | /* high speed support: */ | |
81 | ||
b29002a1 | 82 | static struct usb_endpoint_descriptor eem_hs_in_desc = { |
9b39e9dd BN |
83 | .bLength = USB_DT_ENDPOINT_SIZE, |
84 | .bDescriptorType = USB_DT_ENDPOINT, | |
85 | ||
86 | .bEndpointAddress = USB_DIR_IN, | |
87 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
88 | .wMaxPacketSize = cpu_to_le16(512), | |
89 | }; | |
90 | ||
b29002a1 | 91 | static struct usb_endpoint_descriptor eem_hs_out_desc = { |
9b39e9dd BN |
92 | .bLength = USB_DT_ENDPOINT_SIZE, |
93 | .bDescriptorType = USB_DT_ENDPOINT, | |
94 | ||
95 | .bEndpointAddress = USB_DIR_OUT, | |
96 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
97 | .wMaxPacketSize = cpu_to_le16(512), | |
98 | }; | |
99 | ||
b29002a1 | 100 | static struct usb_descriptor_header *eem_hs_function[] = { |
9b39e9dd BN |
101 | /* CDC EEM control descriptors */ |
102 | (struct usb_descriptor_header *) &eem_intf, | |
103 | (struct usb_descriptor_header *) &eem_hs_in_desc, | |
104 | (struct usb_descriptor_header *) &eem_hs_out_desc, | |
105 | NULL, | |
106 | }; | |
107 | ||
04617db7 PZ |
108 | /* super speed support: */ |
109 | ||
b29002a1 | 110 | static struct usb_endpoint_descriptor eem_ss_in_desc = { |
04617db7 PZ |
111 | .bLength = USB_DT_ENDPOINT_SIZE, |
112 | .bDescriptorType = USB_DT_ENDPOINT, | |
113 | ||
114 | .bEndpointAddress = USB_DIR_IN, | |
115 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
116 | .wMaxPacketSize = cpu_to_le16(1024), | |
117 | }; | |
118 | ||
b29002a1 | 119 | static struct usb_endpoint_descriptor eem_ss_out_desc = { |
04617db7 PZ |
120 | .bLength = USB_DT_ENDPOINT_SIZE, |
121 | .bDescriptorType = USB_DT_ENDPOINT, | |
122 | ||
123 | .bEndpointAddress = USB_DIR_OUT, | |
124 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
125 | .wMaxPacketSize = cpu_to_le16(1024), | |
126 | }; | |
127 | ||
b29002a1 | 128 | static struct usb_ss_ep_comp_descriptor eem_ss_bulk_comp_desc = { |
04617db7 PZ |
129 | .bLength = sizeof eem_ss_bulk_comp_desc, |
130 | .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, | |
131 | ||
132 | /* the following 2 values can be tweaked if necessary */ | |
133 | /* .bMaxBurst = 0, */ | |
134 | /* .bmAttributes = 0, */ | |
135 | }; | |
136 | ||
b29002a1 | 137 | static struct usb_descriptor_header *eem_ss_function[] = { |
04617db7 PZ |
138 | /* CDC EEM control descriptors */ |
139 | (struct usb_descriptor_header *) &eem_intf, | |
140 | (struct usb_descriptor_header *) &eem_ss_in_desc, | |
141 | (struct usb_descriptor_header *) &eem_ss_bulk_comp_desc, | |
142 | (struct usb_descriptor_header *) &eem_ss_out_desc, | |
143 | (struct usb_descriptor_header *) &eem_ss_bulk_comp_desc, | |
144 | NULL, | |
145 | }; | |
146 | ||
9b39e9dd BN |
147 | /* string descriptors: */ |
148 | ||
149 | static struct usb_string eem_string_defs[] = { | |
150 | [0].s = "CDC Ethernet Emulation Model (EEM)", | |
151 | { } /* end of list */ | |
152 | }; | |
153 | ||
154 | static struct usb_gadget_strings eem_string_table = { | |
155 | .language = 0x0409, /* en-us */ | |
156 | .strings = eem_string_defs, | |
157 | }; | |
158 | ||
159 | static struct usb_gadget_strings *eem_strings[] = { | |
160 | &eem_string_table, | |
161 | NULL, | |
162 | }; | |
163 | ||
164 | /*-------------------------------------------------------------------------*/ | |
165 | ||
166 | static int eem_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl) | |
167 | { | |
168 | struct usb_composite_dev *cdev = f->config->cdev; | |
169 | int value = -EOPNOTSUPP; | |
170 | u16 w_index = le16_to_cpu(ctrl->wIndex); | |
171 | u16 w_value = le16_to_cpu(ctrl->wValue); | |
172 | u16 w_length = le16_to_cpu(ctrl->wLength); | |
173 | ||
174 | DBG(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n", | |
175 | ctrl->bRequestType, ctrl->bRequest, | |
176 | w_value, w_index, w_length); | |
177 | ||
178 | /* device either stalls (value < 0) or reports success */ | |
179 | return value; | |
180 | } | |
181 | ||
182 | ||
183 | static int eem_set_alt(struct usb_function *f, unsigned intf, unsigned alt) | |
184 | { | |
185 | struct f_eem *eem = func_to_eem(f); | |
186 | struct usb_composite_dev *cdev = f->config->cdev; | |
187 | struct net_device *net; | |
188 | ||
189 | /* we know alt == 0, so this is an activation or a reset */ | |
190 | if (alt != 0) | |
191 | goto fail; | |
192 | ||
193 | if (intf == eem->ctrl_id) { | |
34422a5e RB |
194 | DBG(cdev, "reset eem\n"); |
195 | gether_disconnect(&eem->port); | |
9b39e9dd | 196 | |
ea2a1df7 | 197 | if (!eem->port.in_ep->desc || !eem->port.out_ep->desc) { |
9b39e9dd | 198 | DBG(cdev, "init eem\n"); |
ea2a1df7 TB |
199 | if (config_ep_by_speed(cdev->gadget, f, |
200 | eem->port.in_ep) || | |
201 | config_ep_by_speed(cdev->gadget, f, | |
202 | eem->port.out_ep)) { | |
203 | eem->port.in_ep->desc = NULL; | |
204 | eem->port.out_ep->desc = NULL; | |
205 | goto fail; | |
206 | } | |
9b39e9dd BN |
207 | } |
208 | ||
209 | /* zlps should not occur because zero-length EEM packets | |
210 | * will be inserted in those cases where they would occur | |
211 | */ | |
212 | eem->port.is_zlp_ok = 1; | |
213 | eem->port.cdc_filter = DEFAULT_FILTER; | |
214 | DBG(cdev, "activate eem\n"); | |
215 | net = gether_connect(&eem->port); | |
216 | if (IS_ERR(net)) | |
217 | return PTR_ERR(net); | |
218 | } else | |
219 | goto fail; | |
220 | ||
221 | return 0; | |
222 | fail: | |
223 | return -EINVAL; | |
224 | } | |
225 | ||
226 | static void eem_disable(struct usb_function *f) | |
227 | { | |
228 | struct f_eem *eem = func_to_eem(f); | |
229 | struct usb_composite_dev *cdev = f->config->cdev; | |
230 | ||
231 | DBG(cdev, "eem deactivated\n"); | |
232 | ||
34422a5e | 233 | if (eem->port.in_ep->enabled) |
9b39e9dd BN |
234 | gether_disconnect(&eem->port); |
235 | } | |
236 | ||
237 | /*-------------------------------------------------------------------------*/ | |
238 | ||
239 | /* EEM function driver setup/binding */ | |
240 | ||
b29002a1 | 241 | static int eem_bind(struct usb_configuration *c, struct usb_function *f) |
9b39e9dd BN |
242 | { |
243 | struct usb_composite_dev *cdev = c->cdev; | |
244 | struct f_eem *eem = func_to_eem(f); | |
998da497 | 245 | struct usb_string *us; |
9b39e9dd BN |
246 | int status; |
247 | struct usb_ep *ep; | |
248 | ||
b29002a1 AP |
249 | struct f_eem_opts *eem_opts; |
250 | ||
251 | eem_opts = container_of(f->fi, struct f_eem_opts, func_inst); | |
252 | /* | |
253 | * in drivers/usb/gadget/configfs.c:configfs_composite_bind() | |
254 | * configurations are bound in sequence with list_for_each_entry, | |
255 | * in each configuration its functions are bound in sequence | |
256 | * with list_for_each_entry, so we assume no race condition | |
257 | * with regard to eem_opts->bound access | |
258 | */ | |
259 | if (!eem_opts->bound) { | |
17b80976 | 260 | mutex_lock(&eem_opts->lock); |
b29002a1 AP |
261 | gether_set_gadget(eem_opts->net, cdev->gadget); |
262 | status = gether_register_netdev(eem_opts->net); | |
17b80976 | 263 | mutex_unlock(&eem_opts->lock); |
b29002a1 AP |
264 | if (status) |
265 | return status; | |
266 | eem_opts->bound = true; | |
267 | } | |
b29002a1 | 268 | |
998da497 AP |
269 | us = usb_gstrings_attach(cdev, eem_strings, |
270 | ARRAY_SIZE(eem_string_defs)); | |
271 | if (IS_ERR(us)) | |
272 | return PTR_ERR(us); | |
273 | eem_intf.iInterface = us[0].id; | |
b29002a1 | 274 | |
9b39e9dd BN |
275 | /* allocate instance-specific interface IDs */ |
276 | status = usb_interface_id(c, f); | |
277 | if (status < 0) | |
278 | goto fail; | |
279 | eem->ctrl_id = status; | |
280 | eem_intf.bInterfaceNumber = status; | |
281 | ||
282 | status = -ENODEV; | |
283 | ||
284 | /* allocate instance-specific endpoints */ | |
285 | ep = usb_ep_autoconfig(cdev->gadget, &eem_fs_in_desc); | |
286 | if (!ep) | |
287 | goto fail; | |
288 | eem->port.in_ep = ep; | |
9b39e9dd BN |
289 | |
290 | ep = usb_ep_autoconfig(cdev->gadget, &eem_fs_out_desc); | |
291 | if (!ep) | |
292 | goto fail; | |
293 | eem->port.out_ep = ep; | |
9b39e9dd BN |
294 | |
295 | status = -ENOMEM; | |
296 | ||
9b39e9dd BN |
297 | /* support all relevant hardware speeds... we expect that when |
298 | * hardware is dual speed, all bulk-capable endpoints work at | |
299 | * both speeds | |
300 | */ | |
10287bae SAS |
301 | eem_hs_in_desc.bEndpointAddress = eem_fs_in_desc.bEndpointAddress; |
302 | eem_hs_out_desc.bEndpointAddress = eem_fs_out_desc.bEndpointAddress; | |
9b39e9dd | 303 | |
10287bae SAS |
304 | eem_ss_in_desc.bEndpointAddress = eem_fs_in_desc.bEndpointAddress; |
305 | eem_ss_out_desc.bEndpointAddress = eem_fs_out_desc.bEndpointAddress; | |
04617db7 | 306 | |
10287bae | 307 | status = usb_assign_descriptors(f, eem_fs_function, eem_hs_function, |
eaef50c7 | 308 | eem_ss_function, NULL); |
10287bae SAS |
309 | if (status) |
310 | goto fail; | |
04617db7 | 311 | |
9b39e9dd | 312 | DBG(cdev, "CDC Ethernet (EEM): %s speed IN/%s OUT/%s\n", |
04617db7 | 313 | gadget_is_superspeed(c->cdev->gadget) ? "super" : |
9b39e9dd BN |
314 | gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full", |
315 | eem->port.in_ep->name, eem->port.out_ep->name); | |
316 | return 0; | |
317 | ||
318 | fail: | |
9b39e9dd BN |
319 | ERROR(cdev, "%s: can't bind, err %d\n", f->name, status); |
320 | ||
321 | return status; | |
322 | } | |
323 | ||
9b39e9dd BN |
324 | static void eem_cmd_complete(struct usb_ep *ep, struct usb_request *req) |
325 | { | |
505d1f69 YK |
326 | struct sk_buff *skb = (struct sk_buff *)req->context; |
327 | ||
328 | dev_kfree_skb_any(skb); | |
9b39e9dd BN |
329 | } |
330 | ||
331 | /* | |
332 | * Add the EEM header and ethernet checksum. | |
333 | * We currently do not attempt to put multiple ethernet frames | |
334 | * into a single USB transfer | |
335 | */ | |
336 | static struct sk_buff *eem_wrap(struct gether *port, struct sk_buff *skb) | |
337 | { | |
338 | struct sk_buff *skb2 = NULL; | |
339 | struct usb_ep *in = port->in_ep; | |
70237dc8 | 340 | int headroom, tailroom, padlen = 0; |
3ff488ab | 341 | u16 len; |
9b39e9dd | 342 | |
70237dc8 PC |
343 | if (!skb) |
344 | return NULL; | |
345 | ||
346 | len = skb->len; | |
347 | headroom = skb_headroom(skb); | |
348 | tailroom = skb_tailroom(skb); | |
9b39e9dd | 349 | |
d82aa8ae NS |
350 | /* When (len + EEM_HLEN + ETH_FCS_LEN) % in->maxpacket) is 0, |
351 | * stick two bytes of zero-length EEM packet on the end. | |
352 | */ | |
353 | if (((len + EEM_HLEN + ETH_FCS_LEN) % in->maxpacket) == 0) | |
354 | padlen += 2; | |
9b39e9dd | 355 | |
d82aa8ae NS |
356 | if ((tailroom >= (ETH_FCS_LEN + padlen)) && |
357 | (headroom >= EEM_HLEN) && !skb_cloned(skb)) | |
358 | goto done; | |
9b39e9dd BN |
359 | |
360 | skb2 = skb_copy_expand(skb, EEM_HLEN, ETH_FCS_LEN + padlen, GFP_ATOMIC); | |
361 | dev_kfree_skb_any(skb); | |
362 | skb = skb2; | |
363 | if (!skb) | |
364 | return skb; | |
365 | ||
366 | done: | |
367 | /* use the "no CRC" option */ | |
368 | put_unaligned_be32(0xdeadbeef, skb_put(skb, 4)); | |
369 | ||
370 | /* EEM packet header format: | |
371 | * b0..13: length of ethernet frame | |
372 | * b14: bmCRC (0 == sentinel CRC) | |
373 | * b15: bmType (0 == data) | |
374 | */ | |
375 | len = skb->len; | |
31e5d4ab | 376 | put_unaligned_le16(len & 0x3FFF, skb_push(skb, 2)); |
9b39e9dd BN |
377 | |
378 | /* add a zero-length EEM packet, if needed */ | |
379 | if (padlen) | |
380 | put_unaligned_le16(0, skb_put(skb, 2)); | |
381 | ||
382 | return skb; | |
383 | } | |
384 | ||
385 | /* | |
386 | * Remove the EEM header. Note that there can be many EEM packets in a single | |
387 | * USB transfer, so we need to break them out and handle them independently. | |
388 | */ | |
389 | static int eem_unwrap(struct gether *port, | |
390 | struct sk_buff *skb, | |
391 | struct sk_buff_head *list) | |
392 | { | |
393 | struct usb_composite_dev *cdev = port->func.config->cdev; | |
394 | int status = 0; | |
395 | ||
396 | do { | |
397 | struct sk_buff *skb2; | |
398 | u16 header; | |
399 | u16 len = 0; | |
400 | ||
401 | if (skb->len < EEM_HLEN) { | |
402 | status = -EINVAL; | |
403 | DBG(cdev, "invalid EEM header\n"); | |
404 | goto error; | |
405 | } | |
406 | ||
407 | /* remove the EEM header */ | |
408 | header = get_unaligned_le16(skb->data); | |
409 | skb_pull(skb, EEM_HLEN); | |
410 | ||
411 | /* EEM packet header format: | |
412 | * b0..14: EEM type dependent (data or command) | |
413 | * b15: bmType (0 == data, 1 == command) | |
414 | */ | |
415 | if (header & BIT(15)) { | |
416 | struct usb_request *req = cdev->req; | |
417 | u16 bmEEMCmd; | |
418 | ||
419 | /* EEM command packet format: | |
420 | * b0..10: bmEEMCmdParam | |
421 | * b11..13: bmEEMCmd | |
422 | * b14: reserved (must be zero) | |
423 | * b15: bmType (1 == command) | |
424 | */ | |
425 | if (header & BIT(14)) | |
426 | continue; | |
427 | ||
428 | bmEEMCmd = (header >> 11) & 0x7; | |
429 | switch (bmEEMCmd) { | |
430 | case 0: /* echo */ | |
431 | len = header & 0x7FF; | |
432 | if (skb->len < len) { | |
433 | status = -EOVERFLOW; | |
434 | goto error; | |
435 | } | |
436 | ||
437 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
438 | if (unlikely(!skb2)) { | |
439 | DBG(cdev, "EEM echo response error\n"); | |
440 | goto next; | |
441 | } | |
442 | skb_trim(skb2, len); | |
443 | put_unaligned_le16(BIT(15) | BIT(11) | len, | |
444 | skb_push(skb2, 2)); | |
505d1f69 YK |
445 | skb_copy_bits(skb2, 0, req->buf, skb2->len); |
446 | req->length = skb2->len; | |
9b39e9dd BN |
447 | req->complete = eem_cmd_complete; |
448 | req->zero = 1; | |
505d1f69 | 449 | req->context = skb2; |
9b39e9dd BN |
450 | if (usb_ep_queue(port->in_ep, req, GFP_ATOMIC)) |
451 | DBG(cdev, "echo response queue fail\n"); | |
452 | break; | |
453 | ||
454 | case 1: /* echo response */ | |
455 | case 2: /* suspend hint */ | |
456 | case 3: /* response hint */ | |
457 | case 4: /* response complete hint */ | |
458 | case 5: /* tickle */ | |
459 | default: /* reserved */ | |
460 | continue; | |
461 | } | |
462 | } else { | |
463 | u32 crc, crc2; | |
464 | struct sk_buff *skb3; | |
465 | ||
466 | /* check for zero-length EEM packet */ | |
467 | if (header == 0) | |
468 | continue; | |
469 | ||
470 | /* EEM data packet format: | |
471 | * b0..13: length of ethernet frame | |
472 | * b14: bmCRC (0 == sentinel, 1 == calculated) | |
473 | * b15: bmType (0 == data) | |
474 | */ | |
475 | len = header & 0x3FFF; | |
476 | if ((skb->len < len) | |
477 | || (len < (ETH_HLEN + ETH_FCS_LEN))) { | |
478 | status = -EINVAL; | |
479 | goto error; | |
480 | } | |
481 | ||
482 | /* validate CRC */ | |
9b39e9dd BN |
483 | if (header & BIT(14)) { |
484 | crc = get_unaligned_le32(skb->data + len | |
485 | - ETH_FCS_LEN); | |
486 | crc2 = ~crc32_le(~0, | |
03ab7461 | 487 | skb->data, len - ETH_FCS_LEN); |
9b39e9dd BN |
488 | } else { |
489 | crc = get_unaligned_be32(skb->data + len | |
490 | - ETH_FCS_LEN); | |
491 | crc2 = 0xdeadbeef; | |
492 | } | |
493 | if (crc != crc2) { | |
494 | DBG(cdev, "invalid EEM CRC\n"); | |
495 | goto next; | |
496 | } | |
497 | ||
498 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
499 | if (unlikely(!skb2)) { | |
500 | DBG(cdev, "unable to unframe EEM packet\n"); | |
501 | continue; | |
502 | } | |
503 | skb_trim(skb2, len - ETH_FCS_LEN); | |
504 | ||
505 | skb3 = skb_copy_expand(skb2, | |
506 | NET_IP_ALIGN, | |
507 | 0, | |
508 | GFP_ATOMIC); | |
509 | if (unlikely(!skb3)) { | |
510 | DBG(cdev, "unable to realign EEM packet\n"); | |
511 | dev_kfree_skb_any(skb2); | |
512 | continue; | |
513 | } | |
514 | dev_kfree_skb_any(skb2); | |
515 | skb_queue_tail(list, skb3); | |
516 | } | |
517 | next: | |
518 | skb_pull(skb, len); | |
519 | } while (skb->len); | |
520 | ||
521 | error: | |
522 | dev_kfree_skb_any(skb); | |
523 | return status; | |
524 | } | |
525 | ||
17b80976 AP |
526 | static inline struct f_eem_opts *to_f_eem_opts(struct config_item *item) |
527 | { | |
528 | return container_of(to_config_group(item), struct f_eem_opts, | |
529 | func_inst.group); | |
530 | } | |
531 | ||
532 | /* f_eem_item_ops */ | |
533 | USB_ETHERNET_CONFIGFS_ITEM(eem); | |
534 | ||
535 | /* f_eem_opts_dev_addr */ | |
536 | USB_ETHERNET_CONFIGFS_ITEM_ATTR_DEV_ADDR(eem); | |
537 | ||
538 | /* f_eem_opts_host_addr */ | |
539 | USB_ETHERNET_CONFIGFS_ITEM_ATTR_HOST_ADDR(eem); | |
540 | ||
541 | /* f_eem_opts_qmult */ | |
542 | USB_ETHERNET_CONFIGFS_ITEM_ATTR_QMULT(eem); | |
543 | ||
544 | /* f_eem_opts_ifname */ | |
545 | USB_ETHERNET_CONFIGFS_ITEM_ATTR_IFNAME(eem); | |
546 | ||
547 | static struct configfs_attribute *eem_attrs[] = { | |
f9a63da3 CH |
548 | &eem_opts_attr_dev_addr, |
549 | &eem_opts_attr_host_addr, | |
550 | &eem_opts_attr_qmult, | |
551 | &eem_opts_attr_ifname, | |
17b80976 AP |
552 | NULL, |
553 | }; | |
554 | ||
97363902 | 555 | static const struct config_item_type eem_func_type = { |
17b80976 AP |
556 | .ct_item_ops = &eem_item_ops, |
557 | .ct_attrs = eem_attrs, | |
558 | .ct_owner = THIS_MODULE, | |
559 | }; | |
560 | ||
b29002a1 AP |
561 | static void eem_free_inst(struct usb_function_instance *f) |
562 | { | |
563 | struct f_eem_opts *opts; | |
564 | ||
565 | opts = container_of(f, struct f_eem_opts, func_inst); | |
566 | if (opts->bound) | |
567 | gether_cleanup(netdev_priv(opts->net)); | |
568 | else | |
569 | free_netdev(opts->net); | |
570 | kfree(opts); | |
571 | } | |
572 | ||
573 | static struct usb_function_instance *eem_alloc_inst(void) | |
574 | { | |
575 | struct f_eem_opts *opts; | |
576 | ||
577 | opts = kzalloc(sizeof(*opts), GFP_KERNEL); | |
578 | if (!opts) | |
579 | return ERR_PTR(-ENOMEM); | |
17b80976 | 580 | mutex_init(&opts->lock); |
b29002a1 AP |
581 | opts->func_inst.free_func_inst = eem_free_inst; |
582 | opts->net = gether_setup_default(); | |
172d934c AP |
583 | if (IS_ERR(opts->net)) { |
584 | struct net_device *net = opts->net; | |
585 | kfree(opts); | |
586 | return ERR_CAST(net); | |
587 | } | |
b29002a1 | 588 | |
17b80976 AP |
589 | config_group_init_type_name(&opts->func_inst.group, "", &eem_func_type); |
590 | ||
b29002a1 AP |
591 | return &opts->func_inst; |
592 | } | |
593 | ||
594 | static void eem_free(struct usb_function *f) | |
595 | { | |
596 | struct f_eem *eem; | |
17b80976 | 597 | struct f_eem_opts *opts; |
b29002a1 AP |
598 | |
599 | eem = func_to_eem(f); | |
17b80976 | 600 | opts = container_of(f->fi, struct f_eem_opts, func_inst); |
b29002a1 | 601 | kfree(eem); |
17b80976 AP |
602 | mutex_lock(&opts->lock); |
603 | opts->refcnt--; | |
604 | mutex_unlock(&opts->lock); | |
b29002a1 AP |
605 | } |
606 | ||
607 | static void eem_unbind(struct usb_configuration *c, struct usb_function *f) | |
608 | { | |
609 | DBG(c->cdev, "eem unbind\n"); | |
610 | ||
611 | usb_free_all_descriptors(f); | |
612 | } | |
613 | ||
5c18a363 | 614 | static struct usb_function *eem_alloc(struct usb_function_instance *fi) |
b29002a1 AP |
615 | { |
616 | struct f_eem *eem; | |
617 | struct f_eem_opts *opts; | |
618 | ||
619 | /* allocate and initialize one new instance */ | |
620 | eem = kzalloc(sizeof(*eem), GFP_KERNEL); | |
621 | if (!eem) | |
622 | return ERR_PTR(-ENOMEM); | |
623 | ||
624 | opts = container_of(fi, struct f_eem_opts, func_inst); | |
17b80976 AP |
625 | mutex_lock(&opts->lock); |
626 | opts->refcnt++; | |
b29002a1 AP |
627 | |
628 | eem->port.ioport = netdev_priv(opts->net); | |
17b80976 | 629 | mutex_unlock(&opts->lock); |
b29002a1 AP |
630 | eem->port.cdc_filter = DEFAULT_FILTER; |
631 | ||
632 | eem->port.func.name = "cdc_eem"; | |
b29002a1 AP |
633 | /* descriptors are per-instance copies */ |
634 | eem->port.func.bind = eem_bind; | |
635 | eem->port.func.unbind = eem_unbind; | |
636 | eem->port.func.set_alt = eem_set_alt; | |
637 | eem->port.func.setup = eem_setup; | |
638 | eem->port.func.disable = eem_disable; | |
639 | eem->port.func.free_func = eem_free; | |
640 | eem->port.wrap = eem_wrap; | |
641 | eem->port.unwrap = eem_unwrap; | |
642 | eem->port.header_len = EEM_HLEN; | |
643 | ||
644 | return &eem->port.func; | |
645 | } | |
646 | ||
647 | DECLARE_USB_FUNCTION_INIT(eem, eem_alloc_inst, eem_alloc); | |
648 | MODULE_LICENSE("GPL"); | |
649 | MODULE_AUTHOR("David Brownell"); |