blob: 434b983f3b4c244f538cf6f12e90015c3ac4f78e [file] [log] [blame]
David Brownell8a408192008-06-19 18:19:32 -07001/*
2 * f_subset.c -- "CDC Subset" Ethernet link function driver
3 *
4 * Copyright (C) 2003-2005,2008 David Brownell
5 * Copyright (C) 2008 Nokia Corporation
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
David Brownell8a408192008-06-19 18:19:32 -070011 */
12
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090013#include <linux/slab.h>
David Brownell8a408192008-06-19 18:19:32 -070014#include <linux/kernel.h>
Andrzej Pietrasiewicz8cedba72013-05-28 09:15:53 +020015#include <linux/module.h>
David Brownell8a408192008-06-19 18:19:32 -070016#include <linux/device.h>
17#include <linux/etherdevice.h>
18
19#include "u_ether.h"
Andrzej Pietrasiewicz02832e52013-05-28 09:15:56 +020020#include "u_ether_configfs.h"
Andrzej Pietrasiewicz8cedba72013-05-28 09:15:53 +020021#include "u_gether.h"
David Brownell8a408192008-06-19 18:19:32 -070022
23/*
24 * This function packages a simple "CDC Subset" Ethernet port with no real
25 * control mechanisms; just raw data transfer over two bulk endpoints.
26 * The data transfer model is exactly that of CDC Ethernet, which is
27 * why we call it the "CDC Subset".
28 *
29 * Because it's not standardized, this has some interoperability issues.
30 * They mostly relate to driver binding, since the data transfer model is
31 * so simple (CDC Ethernet). The original versions of this protocol used
32 * specific product/vendor IDs: byteswapped IDs for Digital Equipment's
33 * SA-1100 "Itsy" board, which could run Linux 2.4 kernels and supported
34 * daughtercards with USB peripheral connectors. (It was used more often
35 * with other boards, using the Itsy identifiers.) Linux hosts recognized
36 * this with CONFIG_USB_ARMLINUX; these devices have only one configuration
37 * and one interface.
38 *
39 * At some point, MCCI defined a (nonconformant) CDC MDLM variant called
40 * "SAFE", which happens to have a mode which is identical to the "CDC
41 * Subset" in terms of data transfer and lack of control model. This was
42 * adopted by later Sharp Zaurus models, and by some other software which
43 * Linux hosts recognize with CONFIG_USB_NET_ZAURUS.
44 *
45 * Because Microsoft's RNDIS drivers are far from robust, we added a few
46 * descriptors to the CDC Subset code, making this code look like a SAFE
47 * implementation. This lets you use MCCI's host side MS-Windows drivers
48 * if you get fed up with RNDIS. It also makes it easier for composite
49 * drivers to work, since they can use class based binding instead of
50 * caring about specific product and vendor IDs.
51 */
52
David Brownell8a408192008-06-19 18:19:32 -070053struct f_gether {
54 struct gether port;
55
56 char ethaddr[14];
David Brownell8a408192008-06-19 18:19:32 -070057};
58
59static inline struct f_gether *func_to_geth(struct usb_function *f)
60{
61 return container_of(f, struct f_gether, port.func);
62}
63
64/*-------------------------------------------------------------------------*/
65
66/*
67 * "Simple" CDC-subset option is a simple vendor-neutral model that most
68 * full speed controllers can handle: one interface, two bulk endpoints.
69 * To assist host side drivers, we fancy it up a bit, and add descriptors so
70 * some host side drivers will understand it as a "SAFE" variant.
71 *
72 * "SAFE" loosely follows CDC WMC MDLM, violating the spec in various ways.
73 * Data endpoints live in the control interface, there's no data interface.
74 * And it's not used to talk to a cell phone radio.
75 */
76
77/* interface descriptor: */
78
Lothar Waßmann8d069842012-03-11 15:08:46 +010079static struct usb_interface_descriptor subset_data_intf = {
David Brownell8a408192008-06-19 18:19:32 -070080 .bLength = sizeof subset_data_intf,
81 .bDescriptorType = USB_DT_INTERFACE,
82
83 /* .bInterfaceNumber = DYNAMIC */
84 .bAlternateSetting = 0,
85 .bNumEndpoints = 2,
86 .bInterfaceClass = USB_CLASS_COMM,
87 .bInterfaceSubClass = USB_CDC_SUBCLASS_MDLM,
88 .bInterfaceProtocol = 0,
89 /* .iInterface = DYNAMIC */
90};
91
Lothar Waßmann8d069842012-03-11 15:08:46 +010092static struct usb_cdc_header_desc mdlm_header_desc = {
David Brownell33376c12008-08-18 17:45:07 -070093 .bLength = sizeof mdlm_header_desc,
David Brownell8a408192008-06-19 18:19:32 -070094 .bDescriptorType = USB_DT_CS_INTERFACE,
95 .bDescriptorSubType = USB_CDC_HEADER_TYPE,
96
Harvey Harrison551509d2009-02-11 14:11:36 -080097 .bcdCDC = cpu_to_le16(0x0110),
David Brownell8a408192008-06-19 18:19:32 -070098};
99
Lothar Waßmann8d069842012-03-11 15:08:46 +0100100static struct usb_cdc_mdlm_desc mdlm_desc = {
David Brownell8a408192008-06-19 18:19:32 -0700101 .bLength = sizeof mdlm_desc,
102 .bDescriptorType = USB_DT_CS_INTERFACE,
103 .bDescriptorSubType = USB_CDC_MDLM_TYPE,
104
Harvey Harrison551509d2009-02-11 14:11:36 -0800105 .bcdVersion = cpu_to_le16(0x0100),
David Brownell8a408192008-06-19 18:19:32 -0700106 .bGUID = {
107 0x5d, 0x34, 0xcf, 0x66, 0x11, 0x18, 0x11, 0xd6,
108 0xa2, 0x1a, 0x00, 0x01, 0x02, 0xca, 0x9a, 0x7f,
109 },
110};
111
112/* since "usb_cdc_mdlm_detail_desc" is a variable length structure, we
113 * can't really use its struct. All we do here is say that we're using
114 * the submode of "SAFE" which directly matches the CDC Subset.
115 */
Lothar Waßmann8d069842012-03-11 15:08:46 +0100116static u8 mdlm_detail_desc[] = {
David Brownell8a408192008-06-19 18:19:32 -0700117 6,
118 USB_DT_CS_INTERFACE,
119 USB_CDC_MDLM_DETAIL_TYPE,
120
121 0, /* "SAFE" */
122 0, /* network control capabilities (none) */
123 0, /* network data capabilities ("raw" encapsulation) */
124};
125
Lothar Waßmann8d069842012-03-11 15:08:46 +0100126static struct usb_cdc_ether_desc ether_desc = {
David Brownell8a408192008-06-19 18:19:32 -0700127 .bLength = sizeof ether_desc,
128 .bDescriptorType = USB_DT_CS_INTERFACE,
129 .bDescriptorSubType = USB_CDC_ETHERNET_TYPE,
130
131 /* this descriptor actually adds value, surprise! */
132 /* .iMACAddress = DYNAMIC */
Harvey Harrison551509d2009-02-11 14:11:36 -0800133 .bmEthernetStatistics = cpu_to_le32(0), /* no statistics */
134 .wMaxSegmentSize = cpu_to_le16(ETH_FRAME_LEN),
135 .wNumberMCFilters = cpu_to_le16(0),
David Brownell8a408192008-06-19 18:19:32 -0700136 .bNumberPowerFilters = 0,
137};
138
139/* full speed support: */
140
Lothar Waßmann8d069842012-03-11 15:08:46 +0100141static struct usb_endpoint_descriptor fs_subset_in_desc = {
David Brownell8a408192008-06-19 18:19:32 -0700142 .bLength = USB_DT_ENDPOINT_SIZE,
143 .bDescriptorType = USB_DT_ENDPOINT,
144
145 .bEndpointAddress = USB_DIR_IN,
146 .bmAttributes = USB_ENDPOINT_XFER_BULK,
147};
148
Lothar Waßmann8d069842012-03-11 15:08:46 +0100149static struct usb_endpoint_descriptor fs_subset_out_desc = {
David Brownell8a408192008-06-19 18:19:32 -0700150 .bLength = USB_DT_ENDPOINT_SIZE,
151 .bDescriptorType = USB_DT_ENDPOINT,
152
153 .bEndpointAddress = USB_DIR_OUT,
154 .bmAttributes = USB_ENDPOINT_XFER_BULK,
155};
156
Lothar Waßmann8d069842012-03-11 15:08:46 +0100157static struct usb_descriptor_header *fs_eth_function[] = {
David Brownell8a408192008-06-19 18:19:32 -0700158 (struct usb_descriptor_header *) &subset_data_intf,
David Brownell33376c12008-08-18 17:45:07 -0700159 (struct usb_descriptor_header *) &mdlm_header_desc,
David Brownell8a408192008-06-19 18:19:32 -0700160 (struct usb_descriptor_header *) &mdlm_desc,
161 (struct usb_descriptor_header *) &mdlm_detail_desc,
162 (struct usb_descriptor_header *) &ether_desc,
David Brownell33376c12008-08-18 17:45:07 -0700163 (struct usb_descriptor_header *) &fs_subset_in_desc,
164 (struct usb_descriptor_header *) &fs_subset_out_desc,
David Brownell8a408192008-06-19 18:19:32 -0700165 NULL,
166};
167
168/* high speed support: */
169
Lothar Waßmann8d069842012-03-11 15:08:46 +0100170static struct usb_endpoint_descriptor hs_subset_in_desc = {
David Brownell8a408192008-06-19 18:19:32 -0700171 .bLength = USB_DT_ENDPOINT_SIZE,
172 .bDescriptorType = USB_DT_ENDPOINT,
173
174 .bmAttributes = USB_ENDPOINT_XFER_BULK,
Harvey Harrison551509d2009-02-11 14:11:36 -0800175 .wMaxPacketSize = cpu_to_le16(512),
David Brownell8a408192008-06-19 18:19:32 -0700176};
177
Lothar Waßmann8d069842012-03-11 15:08:46 +0100178static struct usb_endpoint_descriptor hs_subset_out_desc = {
David Brownell8a408192008-06-19 18:19:32 -0700179 .bLength = USB_DT_ENDPOINT_SIZE,
180 .bDescriptorType = USB_DT_ENDPOINT,
181
182 .bmAttributes = USB_ENDPOINT_XFER_BULK,
Harvey Harrison551509d2009-02-11 14:11:36 -0800183 .wMaxPacketSize = cpu_to_le16(512),
David Brownell8a408192008-06-19 18:19:32 -0700184};
185
Lothar Waßmann8d069842012-03-11 15:08:46 +0100186static struct usb_descriptor_header *hs_eth_function[] = {
David Brownell8a408192008-06-19 18:19:32 -0700187 (struct usb_descriptor_header *) &subset_data_intf,
David Brownell33376c12008-08-18 17:45:07 -0700188 (struct usb_descriptor_header *) &mdlm_header_desc,
David Brownell8a408192008-06-19 18:19:32 -0700189 (struct usb_descriptor_header *) &mdlm_desc,
190 (struct usb_descriptor_header *) &mdlm_detail_desc,
191 (struct usb_descriptor_header *) &ether_desc,
David Brownell33376c12008-08-18 17:45:07 -0700192 (struct usb_descriptor_header *) &hs_subset_in_desc,
193 (struct usb_descriptor_header *) &hs_subset_out_desc,
David Brownell8a408192008-06-19 18:19:32 -0700194 NULL,
195};
196
Paul Zimmerman04617db2011-06-27 14:13:18 -0700197/* super speed support: */
198
Lothar Waßmann8d069842012-03-11 15:08:46 +0100199static struct usb_endpoint_descriptor ss_subset_in_desc = {
Paul Zimmerman04617db2011-06-27 14:13:18 -0700200 .bLength = USB_DT_ENDPOINT_SIZE,
201 .bDescriptorType = USB_DT_ENDPOINT,
202
203 .bmAttributes = USB_ENDPOINT_XFER_BULK,
204 .wMaxPacketSize = cpu_to_le16(1024),
205};
206
Lothar Waßmann8d069842012-03-11 15:08:46 +0100207static struct usb_endpoint_descriptor ss_subset_out_desc = {
Paul Zimmerman04617db2011-06-27 14:13:18 -0700208 .bLength = USB_DT_ENDPOINT_SIZE,
209 .bDescriptorType = USB_DT_ENDPOINT,
210
211 .bmAttributes = USB_ENDPOINT_XFER_BULK,
212 .wMaxPacketSize = cpu_to_le16(1024),
213};
214
Lothar Waßmann8d069842012-03-11 15:08:46 +0100215static struct usb_ss_ep_comp_descriptor ss_subset_bulk_comp_desc = {
Paul Zimmerman04617db2011-06-27 14:13:18 -0700216 .bLength = sizeof ss_subset_bulk_comp_desc,
217 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
218
219 /* the following 2 values can be tweaked if necessary */
220 /* .bMaxBurst = 0, */
221 /* .bmAttributes = 0, */
222};
223
Lothar Waßmann8d069842012-03-11 15:08:46 +0100224static struct usb_descriptor_header *ss_eth_function[] = {
Paul Zimmerman04617db2011-06-27 14:13:18 -0700225 (struct usb_descriptor_header *) &subset_data_intf,
226 (struct usb_descriptor_header *) &mdlm_header_desc,
227 (struct usb_descriptor_header *) &mdlm_desc,
228 (struct usb_descriptor_header *) &mdlm_detail_desc,
229 (struct usb_descriptor_header *) &ether_desc,
230 (struct usb_descriptor_header *) &ss_subset_in_desc,
231 (struct usb_descriptor_header *) &ss_subset_bulk_comp_desc,
232 (struct usb_descriptor_header *) &ss_subset_out_desc,
233 (struct usb_descriptor_header *) &ss_subset_bulk_comp_desc,
234 NULL,
235};
236
David Brownell8a408192008-06-19 18:19:32 -0700237/* string descriptors: */
238
239static struct usb_string geth_string_defs[] = {
240 [0].s = "CDC Ethernet Subset/SAFE",
Sebastian Andrzej Siewior1616e99d2012-10-22 22:15:10 +0200241 [1].s = "",
David Brownell8a408192008-06-19 18:19:32 -0700242 { } /* end of list */
243};
244
245static struct usb_gadget_strings geth_string_table = {
246 .language = 0x0409, /* en-us */
247 .strings = geth_string_defs,
248};
249
250static struct usb_gadget_strings *geth_strings[] = {
251 &geth_string_table,
252 NULL,
253};
254
255/*-------------------------------------------------------------------------*/
256
257static int geth_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
258{
259 struct f_gether *geth = func_to_geth(f);
260 struct usb_composite_dev *cdev = f->config->cdev;
261 struct net_device *net;
262
263 /* we know alt == 0, so this is an activation or a reset */
264
Robert Baldygabb38c182015-09-16 12:10:57 +0200265 if (geth->port.in_ep->enabled) {
David Brownell8a408192008-06-19 18:19:32 -0700266 DBG(cdev, "reset cdc subset\n");
267 gether_disconnect(&geth->port);
268 }
269
270 DBG(cdev, "init + activate cdc subset\n");
Tatyana Brokhmanea2a1df72011-06-28 16:33:50 +0300271 if (config_ep_by_speed(cdev->gadget, f, geth->port.in_ep) ||
272 config_ep_by_speed(cdev->gadget, f, geth->port.out_ep)) {
273 geth->port.in_ep->desc = NULL;
274 geth->port.out_ep->desc = NULL;
275 return -EINVAL;
276 }
David Brownell8a408192008-06-19 18:19:32 -0700277
278 net = gether_connect(&geth->port);
Duan Jiong9f58fa4c2014-04-11 18:05:13 +0800279 return PTR_ERR_OR_ZERO(net);
David Brownell8a408192008-06-19 18:19:32 -0700280}
281
282static void geth_disable(struct usb_function *f)
283{
284 struct f_gether *geth = func_to_geth(f);
285 struct usb_composite_dev *cdev = f->config->cdev;
286
287 DBG(cdev, "net deactivated\n");
288 gether_disconnect(&geth->port);
289}
290
291/*-------------------------------------------------------------------------*/
292
293/* serial function driver setup/binding */
294
Lothar Waßmann8d069842012-03-11 15:08:46 +0100295static int
David Brownell8a408192008-06-19 18:19:32 -0700296geth_bind(struct usb_configuration *c, struct usb_function *f)
297{
298 struct usb_composite_dev *cdev = c->cdev;
299 struct f_gether *geth = func_to_geth(f);
Andrzej Pietrasiewicz74bf9632013-05-28 09:15:55 +0200300 struct usb_string *us;
David Brownell8a408192008-06-19 18:19:32 -0700301 int status;
302 struct usb_ep *ep;
303
Andrzej Pietrasiewicz8cedba72013-05-28 09:15:53 +0200304 struct f_gether_opts *gether_opts;
305
306 gether_opts = container_of(f->fi, struct f_gether_opts, func_inst);
307
308 /*
309 * in drivers/usb/gadget/configfs.c:configfs_composite_bind()
310 * configurations are bound in sequence with list_for_each_entry,
311 * in each configuration its functions are bound in sequence
312 * with list_for_each_entry, so we assume no race condition
313 * with regard to gether_opts->bound access
314 */
315 if (!gether_opts->bound) {
Andrzej Pietrasiewicz02832e52013-05-28 09:15:56 +0200316 mutex_lock(&gether_opts->lock);
Andrzej Pietrasiewicz8cedba72013-05-28 09:15:53 +0200317 gether_set_gadget(gether_opts->net, cdev->gadget);
318 status = gether_register_netdev(gether_opts->net);
Andrzej Pietrasiewicz02832e52013-05-28 09:15:56 +0200319 mutex_unlock(&gether_opts->lock);
Andrzej Pietrasiewicz8cedba72013-05-28 09:15:53 +0200320 if (status)
321 return status;
322 gether_opts->bound = true;
323 }
Andrzej Pietrasiewicz05de3fe2013-12-03 15:15:26 +0100324
Andrzej Pietrasiewicz74bf9632013-05-28 09:15:55 +0200325 us = usb_gstrings_attach(cdev, geth_strings,
326 ARRAY_SIZE(geth_string_defs));
327 if (IS_ERR(us))
328 return PTR_ERR(us);
329
330 subset_data_intf.iInterface = us[0].id;
331 ether_desc.iMACAddress = us[1].id;
Andrzej Pietrasiewicz8cedba72013-05-28 09:15:53 +0200332
David Brownell8a408192008-06-19 18:19:32 -0700333 /* allocate instance-specific interface IDs */
334 status = usb_interface_id(c, f);
335 if (status < 0)
336 goto fail;
337 subset_data_intf.bInterfaceNumber = status;
338
339 status = -ENODEV;
340
341 /* allocate instance-specific endpoints */
David Brownell33376c12008-08-18 17:45:07 -0700342 ep = usb_ep_autoconfig(cdev->gadget, &fs_subset_in_desc);
David Brownell8a408192008-06-19 18:19:32 -0700343 if (!ep)
344 goto fail;
345 geth->port.in_ep = ep;
David Brownell8a408192008-06-19 18:19:32 -0700346
David Brownell33376c12008-08-18 17:45:07 -0700347 ep = usb_ep_autoconfig(cdev->gadget, &fs_subset_out_desc);
David Brownell8a408192008-06-19 18:19:32 -0700348 if (!ep)
349 goto fail;
350 geth->port.out_ep = ep;
David Brownell8a408192008-06-19 18:19:32 -0700351
David Brownell8a408192008-06-19 18:19:32 -0700352 /* support all relevant hardware speeds... we expect that when
353 * hardware is dual speed, all bulk-capable endpoints work at
354 * both speeds
355 */
Sebastian Andrzej Siewior10287ba2012-10-22 22:15:06 +0200356 hs_subset_in_desc.bEndpointAddress = fs_subset_in_desc.bEndpointAddress;
357 hs_subset_out_desc.bEndpointAddress =
358 fs_subset_out_desc.bEndpointAddress;
David Brownell8a408192008-06-19 18:19:32 -0700359
Sebastian Andrzej Siewior10287ba2012-10-22 22:15:06 +0200360 ss_subset_in_desc.bEndpointAddress = fs_subset_in_desc.bEndpointAddress;
361 ss_subset_out_desc.bEndpointAddress =
362 fs_subset_out_desc.bEndpointAddress;
Paul Zimmerman04617db2011-06-27 14:13:18 -0700363
Sebastian Andrzej Siewior10287ba2012-10-22 22:15:06 +0200364 status = usb_assign_descriptors(f, fs_eth_function, hs_eth_function,
John Youneaef50c2016-02-05 17:06:07 -0800365 ss_eth_function, NULL);
Sebastian Andrzej Siewior10287ba2012-10-22 22:15:06 +0200366 if (status)
367 goto fail;
David Brownell8a408192008-06-19 18:19:32 -0700368
369 /* NOTE: all that is done without knowing or caring about
370 * the network link ... which is unavailable to this code
371 * until we're activated via set_alt().
372 */
373
374 DBG(cdev, "CDC Subset: %s speed IN/%s OUT/%s\n",
Paul Zimmerman04617db2011-06-27 14:13:18 -0700375 gadget_is_superspeed(c->cdev->gadget) ? "super" :
David Brownell8a408192008-06-19 18:19:32 -0700376 gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
377 geth->port.in_ep->name, geth->port.out_ep->name);
378 return 0;
379
380fail:
David Brownell8a408192008-06-19 18:19:32 -0700381 ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);
382
383 return status;
384}
385
Andrzej Pietrasiewicz02832e52013-05-28 09:15:56 +0200386static inline struct f_gether_opts *to_f_gether_opts(struct config_item *item)
387{
388 return container_of(to_config_group(item), struct f_gether_opts,
389 func_inst.group);
390}
391
392/* f_gether_item_ops */
393USB_ETHERNET_CONFIGFS_ITEM(gether);
394
395/* f_gether_opts_dev_addr */
396USB_ETHERNET_CONFIGFS_ITEM_ATTR_DEV_ADDR(gether);
397
398/* f_gether_opts_host_addr */
399USB_ETHERNET_CONFIGFS_ITEM_ATTR_HOST_ADDR(gether);
400
401/* f_gether_opts_qmult */
402USB_ETHERNET_CONFIGFS_ITEM_ATTR_QMULT(gether);
403
404/* f_gether_opts_ifname */
405USB_ETHERNET_CONFIGFS_ITEM_ATTR_IFNAME(gether);
406
407static struct configfs_attribute *gether_attrs[] = {
Christoph Hellwigf9a63da2015-10-03 15:32:42 +0200408 &gether_opts_attr_dev_addr,
409 &gether_opts_attr_host_addr,
410 &gether_opts_attr_qmult,
411 &gether_opts_attr_ifname,
Andrzej Pietrasiewicz02832e52013-05-28 09:15:56 +0200412 NULL,
413};
414
415static struct config_item_type gether_func_type = {
416 .ct_item_ops = &gether_item_ops,
417 .ct_attrs = gether_attrs,
418 .ct_owner = THIS_MODULE,
419};
420
Andrzej Pietrasiewicz8cedba72013-05-28 09:15:53 +0200421static void geth_free_inst(struct usb_function_instance *f)
422{
423 struct f_gether_opts *opts;
424
425 opts = container_of(f, struct f_gether_opts, func_inst);
426 if (opts->bound)
427 gether_cleanup(netdev_priv(opts->net));
428 else
429 free_netdev(opts->net);
430 kfree(opts);
431}
432
433static struct usb_function_instance *geth_alloc_inst(void)
434{
435 struct f_gether_opts *opts;
436
437 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
438 if (!opts)
439 return ERR_PTR(-ENOMEM);
Andrzej Pietrasiewicz02832e52013-05-28 09:15:56 +0200440 mutex_init(&opts->lock);
Andrzej Pietrasiewicz8cedba72013-05-28 09:15:53 +0200441 opts->func_inst.free_func_inst = geth_free_inst;
442 opts->net = gether_setup_default();
Andrzej Pietrasiewicz172d9342013-07-25 09:13:18 +0200443 if (IS_ERR(opts->net)) {
444 struct net_device *net = opts->net;
445 kfree(opts);
446 return ERR_CAST(net);
447 }
Andrzej Pietrasiewicz8cedba72013-05-28 09:15:53 +0200448
Andrzej Pietrasiewicz02832e52013-05-28 09:15:56 +0200449 config_group_init_type_name(&opts->func_inst.group, "",
450 &gether_func_type);
451
Andrzej Pietrasiewicz8cedba72013-05-28 09:15:53 +0200452 return &opts->func_inst;
453}
454
455static void geth_free(struct usb_function *f)
456{
457 struct f_gether *eth;
458
459 eth = func_to_geth(f);
460 kfree(eth);
461}
462
463static void geth_unbind(struct usb_configuration *c, struct usb_function *f)
464{
465 geth_string_defs[0].id = 0;
466 usb_free_all_descriptors(f);
467}
468
469static struct usb_function *geth_alloc(struct usb_function_instance *fi)
470{
471 struct f_gether *geth;
472 struct f_gether_opts *opts;
473 int status;
474
475 /* allocate and initialize one new instance */
476 geth = kzalloc(sizeof(*geth), GFP_KERNEL);
477 if (!geth)
478 return ERR_PTR(-ENOMEM);
479
480 opts = container_of(fi, struct f_gether_opts, func_inst);
481
Andrzej Pietrasiewicz02832e52013-05-28 09:15:56 +0200482 mutex_lock(&opts->lock);
483 opts->refcnt++;
Andrzej Pietrasiewicz8cedba72013-05-28 09:15:53 +0200484 /* export host's Ethernet address in CDC format */
485 status = gether_get_host_addr_cdc(opts->net, geth->ethaddr,
486 sizeof(geth->ethaddr));
487 if (status < 12) {
488 kfree(geth);
Wei Yongjundf48fc72013-06-18 11:40:55 +0800489 mutex_unlock(&opts->lock);
Andrzej Pietrasiewicz8cedba72013-05-28 09:15:53 +0200490 return ERR_PTR(-EINVAL);
491 }
492 geth_string_defs[1].s = geth->ethaddr;
493
494 geth->port.ioport = netdev_priv(opts->net);
Andrzej Pietrasiewicz02832e52013-05-28 09:15:56 +0200495 mutex_unlock(&opts->lock);
Andrzej Pietrasiewicz8cedba72013-05-28 09:15:53 +0200496 geth->port.cdc_filter = DEFAULT_FILTER;
497
498 geth->port.func.name = "cdc_subset";
Andrzej Pietrasiewicz8cedba72013-05-28 09:15:53 +0200499 geth->port.func.bind = geth_bind;
500 geth->port.func.unbind = geth_unbind;
501 geth->port.func.set_alt = geth_set_alt;
502 geth->port.func.disable = geth_disable;
503 geth->port.func.free_func = geth_free;
504
505 return &geth->port.func;
506}
507
508DECLARE_USB_FUNCTION_INIT(geth, geth_alloc_inst, geth_alloc);
509MODULE_LICENSE("GPL");
510MODULE_AUTHOR("David Brownell");