This source file includes following definitions.
- func_to_geth
- geth_set_alt
- geth_disable
- geth_bind
- to_f_gether_opts
- geth_free_inst
- geth_alloc_inst
- geth_free
- geth_unbind
- geth_alloc
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9 #include <linux/slab.h>
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/device.h>
13 #include <linux/etherdevice.h>
14
15 #include "u_ether.h"
16 #include "u_ether_configfs.h"
17 #include "u_gether.h"
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49 struct f_gether {
50 struct gether port;
51
52 char ethaddr[14];
53 };
54
55 static inline struct f_gether *func_to_geth(struct usb_function *f)
56 {
57 return container_of(f, struct f_gether, port.func);
58 }
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74
75 static struct usb_interface_descriptor subset_data_intf = {
76 .bLength = sizeof subset_data_intf,
77 .bDescriptorType = USB_DT_INTERFACE,
78
79
80 .bAlternateSetting = 0,
81 .bNumEndpoints = 2,
82 .bInterfaceClass = USB_CLASS_COMM,
83 .bInterfaceSubClass = USB_CDC_SUBCLASS_MDLM,
84 .bInterfaceProtocol = 0,
85
86 };
87
88 static struct usb_cdc_header_desc mdlm_header_desc = {
89 .bLength = sizeof mdlm_header_desc,
90 .bDescriptorType = USB_DT_CS_INTERFACE,
91 .bDescriptorSubType = USB_CDC_HEADER_TYPE,
92
93 .bcdCDC = cpu_to_le16(0x0110),
94 };
95
96 static struct usb_cdc_mdlm_desc mdlm_desc = {
97 .bLength = sizeof mdlm_desc,
98 .bDescriptorType = USB_DT_CS_INTERFACE,
99 .bDescriptorSubType = USB_CDC_MDLM_TYPE,
100
101 .bcdVersion = cpu_to_le16(0x0100),
102 .bGUID = {
103 0x5d, 0x34, 0xcf, 0x66, 0x11, 0x18, 0x11, 0xd6,
104 0xa2, 0x1a, 0x00, 0x01, 0x02, 0xca, 0x9a, 0x7f,
105 },
106 };
107
108
109
110
111
112 static u8 mdlm_detail_desc[] = {
113 6,
114 USB_DT_CS_INTERFACE,
115 USB_CDC_MDLM_DETAIL_TYPE,
116
117 0,
118 0,
119 0,
120 };
121
122 static struct usb_cdc_ether_desc ether_desc = {
123 .bLength = sizeof ether_desc,
124 .bDescriptorType = USB_DT_CS_INTERFACE,
125 .bDescriptorSubType = USB_CDC_ETHERNET_TYPE,
126
127
128
129 .bmEthernetStatistics = cpu_to_le32(0),
130 .wMaxSegmentSize = cpu_to_le16(ETH_FRAME_LEN),
131 .wNumberMCFilters = cpu_to_le16(0),
132 .bNumberPowerFilters = 0,
133 };
134
135
136
137 static struct usb_endpoint_descriptor fs_subset_in_desc = {
138 .bLength = USB_DT_ENDPOINT_SIZE,
139 .bDescriptorType = USB_DT_ENDPOINT,
140
141 .bEndpointAddress = USB_DIR_IN,
142 .bmAttributes = USB_ENDPOINT_XFER_BULK,
143 };
144
145 static struct usb_endpoint_descriptor fs_subset_out_desc = {
146 .bLength = USB_DT_ENDPOINT_SIZE,
147 .bDescriptorType = USB_DT_ENDPOINT,
148
149 .bEndpointAddress = USB_DIR_OUT,
150 .bmAttributes = USB_ENDPOINT_XFER_BULK,
151 };
152
153 static struct usb_descriptor_header *fs_eth_function[] = {
154 (struct usb_descriptor_header *) &subset_data_intf,
155 (struct usb_descriptor_header *) &mdlm_header_desc,
156 (struct usb_descriptor_header *) &mdlm_desc,
157 (struct usb_descriptor_header *) &mdlm_detail_desc,
158 (struct usb_descriptor_header *) ðer_desc,
159 (struct usb_descriptor_header *) &fs_subset_in_desc,
160 (struct usb_descriptor_header *) &fs_subset_out_desc,
161 NULL,
162 };
163
164
165
166 static struct usb_endpoint_descriptor hs_subset_in_desc = {
167 .bLength = USB_DT_ENDPOINT_SIZE,
168 .bDescriptorType = USB_DT_ENDPOINT,
169
170 .bmAttributes = USB_ENDPOINT_XFER_BULK,
171 .wMaxPacketSize = cpu_to_le16(512),
172 };
173
174 static struct usb_endpoint_descriptor hs_subset_out_desc = {
175 .bLength = USB_DT_ENDPOINT_SIZE,
176 .bDescriptorType = USB_DT_ENDPOINT,
177
178 .bmAttributes = USB_ENDPOINT_XFER_BULK,
179 .wMaxPacketSize = cpu_to_le16(512),
180 };
181
182 static struct usb_descriptor_header *hs_eth_function[] = {
183 (struct usb_descriptor_header *) &subset_data_intf,
184 (struct usb_descriptor_header *) &mdlm_header_desc,
185 (struct usb_descriptor_header *) &mdlm_desc,
186 (struct usb_descriptor_header *) &mdlm_detail_desc,
187 (struct usb_descriptor_header *) ðer_desc,
188 (struct usb_descriptor_header *) &hs_subset_in_desc,
189 (struct usb_descriptor_header *) &hs_subset_out_desc,
190 NULL,
191 };
192
193
194
195 static struct usb_endpoint_descriptor ss_subset_in_desc = {
196 .bLength = USB_DT_ENDPOINT_SIZE,
197 .bDescriptorType = USB_DT_ENDPOINT,
198
199 .bmAttributes = USB_ENDPOINT_XFER_BULK,
200 .wMaxPacketSize = cpu_to_le16(1024),
201 };
202
203 static struct usb_endpoint_descriptor ss_subset_out_desc = {
204 .bLength = USB_DT_ENDPOINT_SIZE,
205 .bDescriptorType = USB_DT_ENDPOINT,
206
207 .bmAttributes = USB_ENDPOINT_XFER_BULK,
208 .wMaxPacketSize = cpu_to_le16(1024),
209 };
210
211 static struct usb_ss_ep_comp_descriptor ss_subset_bulk_comp_desc = {
212 .bLength = sizeof ss_subset_bulk_comp_desc,
213 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
214
215
216
217
218 };
219
220 static struct usb_descriptor_header *ss_eth_function[] = {
221 (struct usb_descriptor_header *) &subset_data_intf,
222 (struct usb_descriptor_header *) &mdlm_header_desc,
223 (struct usb_descriptor_header *) &mdlm_desc,
224 (struct usb_descriptor_header *) &mdlm_detail_desc,
225 (struct usb_descriptor_header *) ðer_desc,
226 (struct usb_descriptor_header *) &ss_subset_in_desc,
227 (struct usb_descriptor_header *) &ss_subset_bulk_comp_desc,
228 (struct usb_descriptor_header *) &ss_subset_out_desc,
229 (struct usb_descriptor_header *) &ss_subset_bulk_comp_desc,
230 NULL,
231 };
232
233
234
235 static struct usb_string geth_string_defs[] = {
236 [0].s = "CDC Ethernet Subset/SAFE",
237 [1].s = "",
238 { }
239 };
240
241 static struct usb_gadget_strings geth_string_table = {
242 .language = 0x0409,
243 .strings = geth_string_defs,
244 };
245
246 static struct usb_gadget_strings *geth_strings[] = {
247 &geth_string_table,
248 NULL,
249 };
250
251
252
253 static int geth_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
254 {
255 struct f_gether *geth = func_to_geth(f);
256 struct usb_composite_dev *cdev = f->config->cdev;
257 struct net_device *net;
258
259
260
261 if (geth->port.in_ep->enabled) {
262 DBG(cdev, "reset cdc subset\n");
263 gether_disconnect(&geth->port);
264 }
265
266 DBG(cdev, "init + activate cdc subset\n");
267 if (config_ep_by_speed(cdev->gadget, f, geth->port.in_ep) ||
268 config_ep_by_speed(cdev->gadget, f, geth->port.out_ep)) {
269 geth->port.in_ep->desc = NULL;
270 geth->port.out_ep->desc = NULL;
271 return -EINVAL;
272 }
273
274 net = gether_connect(&geth->port);
275 return PTR_ERR_OR_ZERO(net);
276 }
277
278 static void geth_disable(struct usb_function *f)
279 {
280 struct f_gether *geth = func_to_geth(f);
281 struct usb_composite_dev *cdev = f->config->cdev;
282
283 DBG(cdev, "net deactivated\n");
284 gether_disconnect(&geth->port);
285 }
286
287
288
289
290
291 static int
292 geth_bind(struct usb_configuration *c, struct usb_function *f)
293 {
294 struct usb_composite_dev *cdev = c->cdev;
295 struct f_gether *geth = func_to_geth(f);
296 struct usb_string *us;
297 int status;
298 struct usb_ep *ep;
299
300 struct f_gether_opts *gether_opts;
301
302 gether_opts = container_of(f->fi, struct f_gether_opts, func_inst);
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310
311 if (!gether_opts->bound) {
312 mutex_lock(&gether_opts->lock);
313 gether_set_gadget(gether_opts->net, cdev->gadget);
314 status = gether_register_netdev(gether_opts->net);
315 mutex_unlock(&gether_opts->lock);
316 if (status)
317 return status;
318 gether_opts->bound = true;
319 }
320
321 us = usb_gstrings_attach(cdev, geth_strings,
322 ARRAY_SIZE(geth_string_defs));
323 if (IS_ERR(us))
324 return PTR_ERR(us);
325
326 subset_data_intf.iInterface = us[0].id;
327 ether_desc.iMACAddress = us[1].id;
328
329
330 status = usb_interface_id(c, f);
331 if (status < 0)
332 goto fail;
333 subset_data_intf.bInterfaceNumber = status;
334
335 status = -ENODEV;
336
337
338 ep = usb_ep_autoconfig(cdev->gadget, &fs_subset_in_desc);
339 if (!ep)
340 goto fail;
341 geth->port.in_ep = ep;
342
343 ep = usb_ep_autoconfig(cdev->gadget, &fs_subset_out_desc);
344 if (!ep)
345 goto fail;
346 geth->port.out_ep = ep;
347
348
349
350
351
352 hs_subset_in_desc.bEndpointAddress = fs_subset_in_desc.bEndpointAddress;
353 hs_subset_out_desc.bEndpointAddress =
354 fs_subset_out_desc.bEndpointAddress;
355
356 ss_subset_in_desc.bEndpointAddress = fs_subset_in_desc.bEndpointAddress;
357 ss_subset_out_desc.bEndpointAddress =
358 fs_subset_out_desc.bEndpointAddress;
359
360 status = usb_assign_descriptors(f, fs_eth_function, hs_eth_function,
361 ss_eth_function, NULL);
362 if (status)
363 goto fail;
364
365
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367
368
369
370 DBG(cdev, "CDC Subset: %s speed IN/%s OUT/%s\n",
371 gadget_is_superspeed(c->cdev->gadget) ? "super" :
372 gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
373 geth->port.in_ep->name, geth->port.out_ep->name);
374 return 0;
375
376 fail:
377 ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);
378
379 return status;
380 }
381
382 static inline struct f_gether_opts *to_f_gether_opts(struct config_item *item)
383 {
384 return container_of(to_config_group(item), struct f_gether_opts,
385 func_inst.group);
386 }
387
388
389 USB_ETHERNET_CONFIGFS_ITEM(gether);
390
391
392 USB_ETHERNET_CONFIGFS_ITEM_ATTR_DEV_ADDR(gether);
393
394
395 USB_ETHERNET_CONFIGFS_ITEM_ATTR_HOST_ADDR(gether);
396
397
398 USB_ETHERNET_CONFIGFS_ITEM_ATTR_QMULT(gether);
399
400
401 USB_ETHERNET_CONFIGFS_ITEM_ATTR_IFNAME(gether);
402
403 static struct configfs_attribute *gether_attrs[] = {
404 &gether_opts_attr_dev_addr,
405 &gether_opts_attr_host_addr,
406 &gether_opts_attr_qmult,
407 &gether_opts_attr_ifname,
408 NULL,
409 };
410
411 static const struct config_item_type gether_func_type = {
412 .ct_item_ops = &gether_item_ops,
413 .ct_attrs = gether_attrs,
414 .ct_owner = THIS_MODULE,
415 };
416
417 static void geth_free_inst(struct usb_function_instance *f)
418 {
419 struct f_gether_opts *opts;
420
421 opts = container_of(f, struct f_gether_opts, func_inst);
422 if (opts->bound)
423 gether_cleanup(netdev_priv(opts->net));
424 else
425 free_netdev(opts->net);
426 kfree(opts);
427 }
428
429 static struct usb_function_instance *geth_alloc_inst(void)
430 {
431 struct f_gether_opts *opts;
432
433 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
434 if (!opts)
435 return ERR_PTR(-ENOMEM);
436 mutex_init(&opts->lock);
437 opts->func_inst.free_func_inst = geth_free_inst;
438 opts->net = gether_setup_default();
439 if (IS_ERR(opts->net)) {
440 struct net_device *net = opts->net;
441 kfree(opts);
442 return ERR_CAST(net);
443 }
444
445 config_group_init_type_name(&opts->func_inst.group, "",
446 &gether_func_type);
447
448 return &opts->func_inst;
449 }
450
451 static void geth_free(struct usb_function *f)
452 {
453 struct f_gether *eth;
454
455 eth = func_to_geth(f);
456 kfree(eth);
457 }
458
459 static void geth_unbind(struct usb_configuration *c, struct usb_function *f)
460 {
461 geth_string_defs[0].id = 0;
462 usb_free_all_descriptors(f);
463 }
464
465 static struct usb_function *geth_alloc(struct usb_function_instance *fi)
466 {
467 struct f_gether *geth;
468 struct f_gether_opts *opts;
469 int status;
470
471
472 geth = kzalloc(sizeof(*geth), GFP_KERNEL);
473 if (!geth)
474 return ERR_PTR(-ENOMEM);
475
476 opts = container_of(fi, struct f_gether_opts, func_inst);
477
478 mutex_lock(&opts->lock);
479 opts->refcnt++;
480
481 status = gether_get_host_addr_cdc(opts->net, geth->ethaddr,
482 sizeof(geth->ethaddr));
483 if (status < 12) {
484 kfree(geth);
485 mutex_unlock(&opts->lock);
486 return ERR_PTR(-EINVAL);
487 }
488 geth_string_defs[1].s = geth->ethaddr;
489
490 geth->port.ioport = netdev_priv(opts->net);
491 mutex_unlock(&opts->lock);
492 geth->port.cdc_filter = DEFAULT_FILTER;
493
494 geth->port.func.name = "cdc_subset";
495 geth->port.func.bind = geth_bind;
496 geth->port.func.unbind = geth_unbind;
497 geth->port.func.set_alt = geth_set_alt;
498 geth->port.func.disable = geth_disable;
499 geth->port.func.free_func = geth_free;
500
501 return &geth->port.func;
502 }
503
504 DECLARE_USB_FUNCTION_INIT(geth, geth_alloc_inst, geth_alloc);
505 MODULE_LICENSE("GPL");
506 MODULE_AUTHOR("David Brownell");