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Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa...
[deliverable/linux.git] / drivers / usb / gadget / function / f_ecm.c
CommitLineData
da741b8c
DB		 1/*
2 * f_ecm.c -- USB CDC Ethernet (ECM) 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.
da741b8c
DB		 11 */
12
13/* #define VERBOSE_DEBUG */
14
5a0e3ad6 15#include <linux/slab.h>
da741b8c 16#include <linux/kernel.h>
fee562a6 17#include <linux/module.h>
da741b8c
DB		 18#include <linux/device.h>
19#include <linux/etherdevice.h>
20
21#include "u_ether.h"
da92801c 22#include "u_ether_configfs.h"
fee562a6 23#include "u_ecm.h"
da741b8c
DB		 24
25
26/*
27 * This function is a "CDC Ethernet Networking Control Model" (CDC ECM)
28 * Ethernet link. The data transfer model is simple (packets sent and
29 * received over bulk endpoints using normal short packet termination),
30 * and the control model exposes various data and optional notifications.
31 *
32 * ECM is well standardized and (except for Microsoft) supported by most
33 * operating systems with USB host support. It's the preferred interop
34 * solution for Ethernet over USB, at least for firmware based solutions.
35 * (Hardware solutions tend to be more minimalist.) A newer and simpler
36 * "Ethernet Emulation Model" (CDC EEM) hasn't yet caught on.
37 *
38 * Note that ECM requires the use of "alternate settings" for its data
39 * interface. This means that the set_alt() method has real work to do,
40 * and also means that a get_alt() method is required.
41 */
42
da741b8c
DB		 43
44enum ecm_notify_state {
45 ECM_NOTIFY_NONE, /* don't notify */
46 ECM_NOTIFY_CONNECT, /* issue CONNECT next */
47 ECM_NOTIFY_SPEED, /* issue SPEED_CHANGE next */
48};
49
50struct f_ecm {
51 struct gether port;
52 u8 ctrl_id, data_id;
53
54 char ethaddr[14];
55
da741b8c 56 struct usb_ep *notify;
da741b8c
DB		 57 struct usb_request *notify_req;
58 u8 notify_state;
59 bool is_open;
60
61 /* FIXME is_open needs some irq-ish locking
62 * ... possibly the same as port.ioport
63 */
64};
65
66static inline struct f_ecm *func_to_ecm(struct usb_function *f)
67{
68 return container_of(f, struct f_ecm, port.func);
69}
70
71/* peak (theoretical) bulk transfer rate in bits-per-second */
33376c1c 72static inline unsigned ecm_bitrate(struct usb_gadget *g)
da741b8c 73{
04617db7
PZ		 74 if (gadget_is_superspeed(g) && g->speed == USB_SPEED_SUPER)
75 return 13 * 1024 * 8 * 1000 * 8;
76 else if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
da741b8c
DB		 77 return 13 * 512 * 8 * 1000 * 8;
78 else
04617db7 79 return 19 * 64 * 1 * 1000 * 8;
da741b8c
DB		 80}
81
82/*-------------------------------------------------------------------------*/
83
84/*
85 * Include the status endpoint if we can, even though it's optional.
86 *
87 * Use wMaxPacketSize big enough to fit CDC_NOTIFY_SPEED_CHANGE in one
88 * packet, to simplify cancellation; and a big transfer interval, to
89 * waste less bandwidth.
90 *
91 * Some drivers (like Linux 2.4 cdc-ether!) "need" it to exist even
92 * if they ignore the connect/disconnect notifications that real aether
93 * can provide. More advanced cdc configurations might want to support
94 * encapsulated commands (vendor-specific, using control-OUT).
95 */
96
bcb2f99c 97#define ECM_STATUS_INTERVAL_MS 32
33376c1c 98#define ECM_STATUS_BYTECOUNT 16 /* 8 byte header + data */
da741b8c
DB		 99
100
101/* interface descriptor: */
102
d11519ad
PN		 103static struct usb_interface_assoc_descriptor
104ecm_iad_descriptor = {
105 .bLength = sizeof ecm_iad_descriptor,
106 .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
107
108 /* .bFirstInterface = DYNAMIC, */
109 .bInterfaceCount = 2, /* control + data */
110 .bFunctionClass = USB_CLASS_COMM,
111 .bFunctionSubClass = USB_CDC_SUBCLASS_ETHERNET,
112 .bFunctionProtocol = USB_CDC_PROTO_NONE,
113 /* .iFunction = DYNAMIC */
114};
115
116
28824b18 117static struct usb_interface_descriptor ecm_control_intf = {
da741b8c
DB		 118 .bLength = sizeof ecm_control_intf,
119 .bDescriptorType = USB_DT_INTERFACE,
120
121 /* .bInterfaceNumber = DYNAMIC */
122 /* status endpoint is optional; this could be patched later */
123 .bNumEndpoints = 1,
124 .bInterfaceClass = USB_CLASS_COMM,
125 .bInterfaceSubClass = USB_CDC_SUBCLASS_ETHERNET,
126 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
127 /* .iInterface = DYNAMIC */
128};
129
28824b18 130static struct usb_cdc_header_desc ecm_header_desc = {
33376c1c 131 .bLength = sizeof ecm_header_desc,
da741b8c
DB		 132 .bDescriptorType = USB_DT_CS_INTERFACE,
133 .bDescriptorSubType = USB_CDC_HEADER_TYPE,
134
551509d2 135 .bcdCDC = cpu_to_le16(0x0110),
da741b8c
DB		 136};
137
28824b18 138static struct usb_cdc_union_desc ecm_union_desc = {
da741b8c
DB		 139 .bLength = sizeof(ecm_union_desc),
140 .bDescriptorType = USB_DT_CS_INTERFACE,
141 .bDescriptorSubType = USB_CDC_UNION_TYPE,
142 /* .bMasterInterface0 = DYNAMIC */
143 /* .bSlaveInterface0 = DYNAMIC */
144};
145
28824b18 146static struct usb_cdc_ether_desc ecm_desc = {
33376c1c 147 .bLength = sizeof ecm_desc,
da741b8c
DB		 148 .bDescriptorType = USB_DT_CS_INTERFACE,
149 .bDescriptorSubType = USB_CDC_ETHERNET_TYPE,
150
151 /* this descriptor actually adds value, surprise! */
152 /* .iMACAddress = DYNAMIC */
551509d2
HH		 153 .bmEthernetStatistics = cpu_to_le32(0), /* no statistics */
154 .wMaxSegmentSize = cpu_to_le16(ETH_FRAME_LEN),
155 .wNumberMCFilters = cpu_to_le16(0),
da741b8c
DB		 156 .bNumberPowerFilters = 0,
157};
158
159/* the default data interface has no endpoints ... */
160
28824b18 161static struct usb_interface_descriptor ecm_data_nop_intf = {
da741b8c
DB		 162 .bLength = sizeof ecm_data_nop_intf,
163 .bDescriptorType = USB_DT_INTERFACE,
164
165 .bInterfaceNumber = 1,
166 .bAlternateSetting = 0,
167 .bNumEndpoints = 0,
168 .bInterfaceClass = USB_CLASS_CDC_DATA,
169 .bInterfaceSubClass = 0,
170 .bInterfaceProtocol = 0,
171 /* .iInterface = DYNAMIC */
172};
173
174/* ... but the "real" data interface has two bulk endpoints */
175
28824b18 176static struct usb_interface_descriptor ecm_data_intf = {
da741b8c
DB		 177 .bLength = sizeof ecm_data_intf,
178 .bDescriptorType = USB_DT_INTERFACE,
179
180 .bInterfaceNumber = 1,
181 .bAlternateSetting = 1,
182 .bNumEndpoints = 2,
183 .bInterfaceClass = USB_CLASS_CDC_DATA,
184 .bInterfaceSubClass = 0,
185 .bInterfaceProtocol = 0,
186 /* .iInterface = DYNAMIC */
187};
188
189/* full speed support: */
190
28824b18 191static struct usb_endpoint_descriptor fs_ecm_notify_desc = {
da741b8c
DB		 192 .bLength = USB_DT_ENDPOINT_SIZE,
193 .bDescriptorType = USB_DT_ENDPOINT,
194
195 .bEndpointAddress = USB_DIR_IN,
196 .bmAttributes = USB_ENDPOINT_XFER_INT,
551509d2 197 .wMaxPacketSize = cpu_to_le16(ECM_STATUS_BYTECOUNT),
bcb2f99c 198 .bInterval = ECM_STATUS_INTERVAL_MS,
da741b8c
DB		 199};
200
28824b18 201static struct usb_endpoint_descriptor fs_ecm_in_desc = {
da741b8c
DB		 202 .bLength = USB_DT_ENDPOINT_SIZE,
203 .bDescriptorType = USB_DT_ENDPOINT,
204
205 .bEndpointAddress = USB_DIR_IN,
206 .bmAttributes = USB_ENDPOINT_XFER_BULK,
207};
208
28824b18 209static struct usb_endpoint_descriptor fs_ecm_out_desc = {
da741b8c
DB		 210 .bLength = USB_DT_ENDPOINT_SIZE,
211 .bDescriptorType = USB_DT_ENDPOINT,
212
213 .bEndpointAddress = USB_DIR_OUT,
214 .bmAttributes = USB_ENDPOINT_XFER_BULK,
215};
216
28824b18 217static struct usb_descriptor_header *ecm_fs_function[] = {
da741b8c 218 /* CDC ECM control descriptors */
d11519ad 219 (struct usb_descriptor_header *) &ecm_iad_descriptor,
da741b8c 220 (struct usb_descriptor_header *) &ecm_control_intf,
33376c1c 221 (struct usb_descriptor_header *) &ecm_header_desc,
da741b8c 222 (struct usb_descriptor_header *) &ecm_union_desc,
33376c1c 223 (struct usb_descriptor_header *) &ecm_desc,
04617db7 224
da741b8c 225 /* NOTE: status endpoint might need to be removed */
33376c1c 226 (struct usb_descriptor_header *) &fs_ecm_notify_desc,
04617db7 227
da741b8c
DB		 228 /* data interface, altsettings 0 and 1 */
229 (struct usb_descriptor_header *) &ecm_data_nop_intf,
230 (struct usb_descriptor_header *) &ecm_data_intf,
33376c1c
DB		 231 (struct usb_descriptor_header *) &fs_ecm_in_desc,
232 (struct usb_descriptor_header *) &fs_ecm_out_desc,
da741b8c
DB		 233 NULL,
234};
235
236/* high speed support: */
237
28824b18 238static struct usb_endpoint_descriptor hs_ecm_notify_desc = {
da741b8c
DB		 239 .bLength = USB_DT_ENDPOINT_SIZE,
240 .bDescriptorType = USB_DT_ENDPOINT,
241
242 .bEndpointAddress = USB_DIR_IN,
243 .bmAttributes = USB_ENDPOINT_XFER_INT,
551509d2 244 .wMaxPacketSize = cpu_to_le16(ECM_STATUS_BYTECOUNT),
bcb2f99c 245 .bInterval = USB_MS_TO_HS_INTERVAL(ECM_STATUS_INTERVAL_MS),
da741b8c 246};
04617db7 247
28824b18 248static struct usb_endpoint_descriptor hs_ecm_in_desc = {
da741b8c
DB		 249 .bLength = USB_DT_ENDPOINT_SIZE,
250 .bDescriptorType = USB_DT_ENDPOINT,
251
252 .bEndpointAddress = USB_DIR_IN,
253 .bmAttributes = USB_ENDPOINT_XFER_BULK,
551509d2 254 .wMaxPacketSize = cpu_to_le16(512),
da741b8c
DB		 255};
256
28824b18 257static struct usb_endpoint_descriptor hs_ecm_out_desc = {
da741b8c
DB		 258 .bLength = USB_DT_ENDPOINT_SIZE,
259 .bDescriptorType = USB_DT_ENDPOINT,
260
261 .bEndpointAddress = USB_DIR_OUT,
262 .bmAttributes = USB_ENDPOINT_XFER_BULK,
551509d2 263 .wMaxPacketSize = cpu_to_le16(512),
da741b8c
DB		 264};
265
28824b18 266static struct usb_descriptor_header *ecm_hs_function[] = {
da741b8c 267 /* CDC ECM control descriptors */
d11519ad 268 (struct usb_descriptor_header *) &ecm_iad_descriptor,
da741b8c 269 (struct usb_descriptor_header *) &ecm_control_intf,
33376c1c 270 (struct usb_descriptor_header *) &ecm_header_desc,
da741b8c 271 (struct usb_descriptor_header *) &ecm_union_desc,
33376c1c 272 (struct usb_descriptor_header *) &ecm_desc,
04617db7 273
da741b8c 274 /* NOTE: status endpoint might need to be removed */
33376c1c 275 (struct usb_descriptor_header *) &hs_ecm_notify_desc,
04617db7 276
da741b8c
DB		 277 /* data interface, altsettings 0 and 1 */
278 (struct usb_descriptor_header *) &ecm_data_nop_intf,
279 (struct usb_descriptor_header *) &ecm_data_intf,
33376c1c
DB		 280 (struct usb_descriptor_header *) &hs_ecm_in_desc,
281 (struct usb_descriptor_header *) &hs_ecm_out_desc,
da741b8c
DB		 282 NULL,
283};
284
04617db7
PZ		 285/* super speed support: */
286
287static struct usb_endpoint_descriptor ss_ecm_notify_desc = {
288 .bLength = USB_DT_ENDPOINT_SIZE,
289 .bDescriptorType = USB_DT_ENDPOINT,
290
291 .bEndpointAddress = USB_DIR_IN,
292 .bmAttributes = USB_ENDPOINT_XFER_INT,
293 .wMaxPacketSize = cpu_to_le16(ECM_STATUS_BYTECOUNT),
bcb2f99c 294 .bInterval = USB_MS_TO_HS_INTERVAL(ECM_STATUS_INTERVAL_MS),
04617db7
PZ		 295};
296
297static struct usb_ss_ep_comp_descriptor ss_ecm_intr_comp_desc = {
298 .bLength = sizeof ss_ecm_intr_comp_desc,
299 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
300
301 /* the following 3 values can be tweaked if necessary */
302 /* .bMaxBurst = 0, */
303 /* .bmAttributes = 0, */
304 .wBytesPerInterval = cpu_to_le16(ECM_STATUS_BYTECOUNT),
305};
306
307static struct usb_endpoint_descriptor ss_ecm_in_desc = {
308 .bLength = USB_DT_ENDPOINT_SIZE,
309 .bDescriptorType = USB_DT_ENDPOINT,
310
311 .bEndpointAddress = USB_DIR_IN,
312 .bmAttributes = USB_ENDPOINT_XFER_BULK,
313 .wMaxPacketSize = cpu_to_le16(1024),
314};
315
316static struct usb_endpoint_descriptor ss_ecm_out_desc = {
317 .bLength = USB_DT_ENDPOINT_SIZE,
318 .bDescriptorType = USB_DT_ENDPOINT,
319
320 .bEndpointAddress = USB_DIR_OUT,
321 .bmAttributes = USB_ENDPOINT_XFER_BULK,
322 .wMaxPacketSize = cpu_to_le16(1024),
323};
324
325static struct usb_ss_ep_comp_descriptor ss_ecm_bulk_comp_desc = {
326 .bLength = sizeof ss_ecm_bulk_comp_desc,
327 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
328
329 /* the following 2 values can be tweaked if necessary */
330 /* .bMaxBurst = 0, */
331 /* .bmAttributes = 0, */
332};
333
334static struct usb_descriptor_header *ecm_ss_function[] = {
335 /* CDC ECM control descriptors */
585e3931 336 (struct usb_descriptor_header *) &ecm_iad_descriptor,
04617db7
PZ		 337 (struct usb_descriptor_header *) &ecm_control_intf,
338 (struct usb_descriptor_header *) &ecm_header_desc,
339 (struct usb_descriptor_header *) &ecm_union_desc,
340 (struct usb_descriptor_header *) &ecm_desc,
341
342 /* NOTE: status endpoint might need to be removed */
343 (struct usb_descriptor_header *) &ss_ecm_notify_desc,
344 (struct usb_descriptor_header *) &ss_ecm_intr_comp_desc,
345
346 /* data interface, altsettings 0 and 1 */
347 (struct usb_descriptor_header *) &ecm_data_nop_intf,
348 (struct usb_descriptor_header *) &ecm_data_intf,
349 (struct usb_descriptor_header *) &ss_ecm_in_desc,
350 (struct usb_descriptor_header *) &ss_ecm_bulk_comp_desc,
351 (struct usb_descriptor_header *) &ss_ecm_out_desc,
352 (struct usb_descriptor_header *) &ss_ecm_bulk_comp_desc,
353 NULL,
354};
355
da741b8c
DB		 356/* string descriptors: */
357
358static struct usb_string ecm_string_defs[] = {
359 [0].s = "CDC Ethernet Control Model (ECM)",
1616e99d 360 [1].s = "",
da741b8c 361 [2].s = "CDC Ethernet Data",
d11519ad 362 [3].s = "CDC ECM",
da741b8c
DB		 363 { } /* end of list */
364};
365
366static struct usb_gadget_strings ecm_string_table = {
367 .language = 0x0409, /* en-us */
368 .strings = ecm_string_defs,
369};
370
371static struct usb_gadget_strings *ecm_strings[] = {
372 &ecm_string_table,
373 NULL,
374};
375
376/*-------------------------------------------------------------------------*/
377
378static void ecm_do_notify(struct f_ecm *ecm)
379{
380 struct usb_request *req = ecm->notify_req;
381 struct usb_cdc_notification *event;
382 struct usb_composite_dev *cdev = ecm->port.func.config->cdev;
383 __le32 *data;
384 int status;
385
386 /* notification already in flight? */
387 if (!req)
388 return;
389
390 event = req->buf;
391 switch (ecm->notify_state) {
392 case ECM_NOTIFY_NONE:
393 return;
394
395 case ECM_NOTIFY_CONNECT:
396 event->bNotificationType = USB_CDC_NOTIFY_NETWORK_CONNECTION;
397 if (ecm->is_open)
398 event->wValue = cpu_to_le16(1);
399 else
400 event->wValue = cpu_to_le16(0);
401 event->wLength = 0;
402 req->length = sizeof *event;
403
404 DBG(cdev, "notify connect %s\n",
405 ecm->is_open ? "true" : "false");
406 ecm->notify_state = ECM_NOTIFY_SPEED;
407 break;
408
409 case ECM_NOTIFY_SPEED:
410 event->bNotificationType = USB_CDC_NOTIFY_SPEED_CHANGE;
411 event->wValue = cpu_to_le16(0);
412 event->wLength = cpu_to_le16(8);
33376c1c 413 req->length = ECM_STATUS_BYTECOUNT;
da741b8c
DB		 414
415 /* SPEED_CHANGE data is up/down speeds in bits/sec */
416 data = req->buf + sizeof *event;
33376c1c 417 data[0] = cpu_to_le32(ecm_bitrate(cdev->gadget));
da741b8c
DB		 418 data[1] = data[0];
419
33376c1c 420 DBG(cdev, "notify speed %d\n", ecm_bitrate(cdev->gadget));
da741b8c
DB		 421 ecm->notify_state = ECM_NOTIFY_NONE;
422 break;
423 }
424 event->bmRequestType = 0xA1;
425 event->wIndex = cpu_to_le16(ecm->ctrl_id);
426
427 ecm->notify_req = NULL;
428 status = usb_ep_queue(ecm->notify, req, GFP_ATOMIC);
429 if (status < 0) {
430 ecm->notify_req = req;
431 DBG(cdev, "notify --> %d\n", status);
432 }
433}
434
435static void ecm_notify(struct f_ecm *ecm)
436{
437 /* NOTE on most versions of Linux, host side cdc-ethernet
438 * won't listen for notifications until its netdevice opens.
439 * The first notification then sits in the FIFO for a long
440 * time, and the second one is queued.
441 */
442 ecm->notify_state = ECM_NOTIFY_CONNECT;
443 ecm_do_notify(ecm);
444}
445
446static void ecm_notify_complete(struct usb_ep *ep, struct usb_request *req)
447{
448 struct f_ecm *ecm = req->context;
449 struct usb_composite_dev *cdev = ecm->port.func.config->cdev;
450 struct usb_cdc_notification *event = req->buf;
451
452 switch (req->status) {
453 case 0:
454 /* no fault */
455 break;
456 case -ECONNRESET:
457 case -ESHUTDOWN:
458 ecm->notify_state = ECM_NOTIFY_NONE;
459 break;
460 default:
461 DBG(cdev, "event %02x --> %d\n",
462 event->bNotificationType, req->status);
463 break;
464 }
465 ecm->notify_req = req;
466 ecm_do_notify(ecm);
467}
468
469static int ecm_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
470{
471 struct f_ecm *ecm = func_to_ecm(f);
472 struct usb_composite_dev *cdev = f->config->cdev;
473 struct usb_request *req = cdev->req;
474 int value = -EOPNOTSUPP;
475 u16 w_index = le16_to_cpu(ctrl->wIndex);
476 u16 w_value = le16_to_cpu(ctrl->wValue);
477 u16 w_length = le16_to_cpu(ctrl->wLength);
478
479 /* composite driver infrastructure handles everything except
480 * CDC class messages; interface activation uses set_alt().
481 */
482 switch ((ctrl->bRequestType << 8) | ctrl->bRequest) {
483 case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
484 | USB_CDC_SET_ETHERNET_PACKET_FILTER:
485 /* see 6.2.30: no data, wIndex = interface,
486 * wValue = packet filter bitmap
487 */
488 if (w_length != 0 || w_index != ecm->ctrl_id)
489 goto invalid;
490 DBG(cdev, "packet filter %02x\n", w_value);
491 /* REVISIT locking of cdc_filter. This assumes the UDC
492 * driver won't have a concurrent packet TX irq running on
493 * another CPU; or that if it does, this write is atomic...
494 */
495 ecm->port.cdc_filter = w_value;
496 value = 0;
497 break;
498
499 /* and optionally:
500 * case USB_CDC_SEND_ENCAPSULATED_COMMAND:
501 * case USB_CDC_GET_ENCAPSULATED_RESPONSE:
502 * case USB_CDC_SET_ETHERNET_MULTICAST_FILTERS:
503 * case USB_CDC_SET_ETHERNET_PM_PATTERN_FILTER:
504 * case USB_CDC_GET_ETHERNET_PM_PATTERN_FILTER:
505 * case USB_CDC_GET_ETHERNET_STATISTIC:
506 */
507
508 default:
509invalid:
510 DBG(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
511 ctrl->bRequestType, ctrl->bRequest,
512 w_value, w_index, w_length);
513 }
514
515 /* respond with data transfer or status phase? */
516 if (value >= 0) {
517 DBG(cdev, "ecm req%02x.%02x v%04x i%04x l%d\n",
518 ctrl->bRequestType, ctrl->bRequest,
519 w_value, w_index, w_length);
520 req->zero = 0;
521 req->length = value;
522 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
523 if (value < 0)
524 ERROR(cdev, "ecm req %02x.%02x response err %d\n",
525 ctrl->bRequestType, ctrl->bRequest,
526 value);
527 }
528
529 /* device either stalls (value < 0) or reports success */
530 return value;
531}
532
533
534static int ecm_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
535{
536 struct f_ecm *ecm = func_to_ecm(f);
537 struct usb_composite_dev *cdev = f->config->cdev;
538
539 /* Control interface has only altsetting 0 */
540 if (intf == ecm->ctrl_id) {
541 if (alt != 0)
542 goto fail;
543
92fbfc38
RB		 544 VDBG(cdev, "reset ecm control %d\n", intf);
545 usb_ep_disable(ecm->notify);
ea2a1df7 546 if (!(ecm->notify->desc)) {
da741b8c 547 VDBG(cdev, "init ecm ctrl %d\n", intf);
ea2a1df7
TB		 548 if (config_ep_by_speed(cdev->gadget, f, ecm->notify))
549 goto fail;
da741b8c 550 }
72c973dd 551 usb_ep_enable(ecm->notify);
da741b8c
DB		 552
553 /* Data interface has two altsettings, 0 and 1 */
554 } else if (intf == ecm->data_id) {
555 if (alt > 1)
556 goto fail;
557
92fbfc38 558 if (ecm->port.in_ep->enabled) {
da741b8c
DB		 559 DBG(cdev, "reset ecm\n");
560 gether_disconnect(&ecm->port);
561 }
562
ea2a1df7
TB		 563 if (!ecm->port.in_ep->desc ||
564 !ecm->port.out_ep->desc) {
da741b8c 565 DBG(cdev, "init ecm\n");
ea2a1df7
TB		 566 if (config_ep_by_speed(cdev->gadget, f,
567 ecm->port.in_ep) ||
568 config_ep_by_speed(cdev->gadget, f,
569 ecm->port.out_ep)) {
570 ecm->port.in_ep->desc = NULL;
571 ecm->port.out_ep->desc = NULL;
572 goto fail;
573 }
da741b8c
DB		 574 }
575
576 /* CDC Ethernet only sends data in non-default altsettings.
577 * Changing altsettings resets filters, statistics, etc.
578 */
579 if (alt == 1) {
580 struct net_device *net;
581
582 /* Enable zlps by default for ECM conformance;
90f79768 583 * override for musb_hdrc (avoids txdma ovhead).
da741b8c 584 */
7a896d40
RB		 585 ecm->port.is_zlp_ok =
586 gadget_is_zlp_supported(cdev->gadget);
da741b8c
DB		 587 ecm->port.cdc_filter = DEFAULT_FILTER;
588 DBG(cdev, "activate ecm\n");
589 net = gether_connect(&ecm->port);
590 if (IS_ERR(net))
591 return PTR_ERR(net);
592 }
593
594 /* NOTE this can be a minor disagreement with the ECM spec,
595 * which says speed notifications will "always" follow
596 * connection notifications. But we allow one connect to
597 * follow another (if the first is in flight), and instead
598 * just guarantee that a speed notification is always sent.
599 */
600 ecm_notify(ecm);
601 } else
602 goto fail;
603
604 return 0;
605fail:
606 return -EINVAL;
607}
608
609/* Because the data interface supports multiple altsettings,
610 * this ECM function *MUST* implement a get_alt() method.
611 */
612static int ecm_get_alt(struct usb_function *f, unsigned intf)
613{
614 struct f_ecm *ecm = func_to_ecm(f);
615
616 if (intf == ecm->ctrl_id)
617 return 0;
92fbfc38 618 return ecm->port.in_ep->enabled ? 1 : 0;
da741b8c
DB		 619}
620
621static void ecm_disable(struct usb_function *f)
622{
623 struct f_ecm *ecm = func_to_ecm(f);
624 struct usb_composite_dev *cdev = f->config->cdev;
625
626 DBG(cdev, "ecm deactivated\n");
627
92fbfc38 628 if (ecm->port.in_ep->enabled)
da741b8c
DB		 629 gether_disconnect(&ecm->port);
630
92fbfc38
RB		 631 usb_ep_disable(ecm->notify);
632 ecm->notify->desc = NULL;
da741b8c
DB		 633}
634
635/*-------------------------------------------------------------------------*/
636
637/*
638 * Callbacks let us notify the host about connect/disconnect when the
639 * net device is opened or closed.
640 *
641 * For testing, note that link states on this side include both opened
642 * and closed variants of:
643 *
644 * - disconnected/unconfigured
645 * - configured but inactive (data alt 0)
646 * - configured and active (data alt 1)
647 *
648 * Each needs to be tested with unplug, rmmod, SET_CONFIGURATION, and
649 * SET_INTERFACE (altsetting). Remember also that "configured" doesn't
650 * imply the host is actually polling the notification endpoint, and
651 * likewise that "active" doesn't imply it's actually using the data
652 * endpoints for traffic.
653 */
654
655static void ecm_open(struct gether *geth)
656{
657 struct f_ecm *ecm = func_to_ecm(&geth->func);
658
659 DBG(ecm->port.func.config->cdev, "%s\n", __func__);
660
661 ecm->is_open = true;
662 ecm_notify(ecm);
663}
664
665static void ecm_close(struct gether *geth)
666{
667 struct f_ecm *ecm = func_to_ecm(&geth->func);
668
669 DBG(ecm->port.func.config->cdev, "%s\n", __func__);
670
671 ecm->is_open = false;
672 ecm_notify(ecm);
673}
674
675/*-------------------------------------------------------------------------*/
676
677/* ethernet function driver setup/binding */
678
28824b18 679static int
da741b8c
DB		 680ecm_bind(struct usb_configuration *c, struct usb_function *f)
681{
682 struct usb_composite_dev *cdev = c->cdev;
683 struct f_ecm *ecm = func_to_ecm(f);
06b72598 684 struct usb_string *us;
da741b8c
DB		 685 int status;
686 struct usb_ep *ep;
687
fee562a6
AP		 688 struct f_ecm_opts *ecm_opts;
689
690 if (!can_support_ecm(cdev->gadget))
691 return -EINVAL;
692
693 ecm_opts = container_of(f->fi, struct f_ecm_opts, func_inst);
694
695 /*
696 * in drivers/usb/gadget/configfs.c:configfs_composite_bind()
697 * configurations are bound in sequence with list_for_each_entry,
698 * in each configuration its functions are bound in sequence
699 * with list_for_each_entry, so we assume no race condition
700 * with regard to ecm_opts->bound access
701 */
702 if (!ecm_opts->bound) {
da92801c 703 mutex_lock(&ecm_opts->lock);
fee562a6
AP		 704 gether_set_gadget(ecm_opts->net, cdev->gadget);
705 status = gether_register_netdev(ecm_opts->net);
da92801c 706 mutex_unlock(&ecm_opts->lock);
fee562a6
AP		 707 if (status)
708 return status;
709 ecm_opts->bound = true;
710 }
f1a2ca2e 711
06b72598
AP		 712 us = usb_gstrings_attach(cdev, ecm_strings,
713 ARRAY_SIZE(ecm_string_defs));
714 if (IS_ERR(us))
715 return PTR_ERR(us);
716 ecm_control_intf.iInterface = us[0].id;
717 ecm_data_intf.iInterface = us[2].id;
718 ecm_desc.iMACAddress = us[1].id;
719 ecm_iad_descriptor.iFunction = us[3].id;
fee562a6 720
da741b8c
DB		 721 /* allocate instance-specific interface IDs */
722 status = usb_interface_id(c, f);
723 if (status < 0)
724 goto fail;
725 ecm->ctrl_id = status;
d11519ad 726 ecm_iad_descriptor.bFirstInterface = status;
da741b8c
DB		 727
728 ecm_control_intf.bInterfaceNumber = status;
729 ecm_union_desc.bMasterInterface0 = status;
730
731 status = usb_interface_id(c, f);
732 if (status < 0)
733 goto fail;
734 ecm->data_id = status;
735
736 ecm_data_nop_intf.bInterfaceNumber = status;
737 ecm_data_intf.bInterfaceNumber = status;
738 ecm_union_desc.bSlaveInterface0 = status;
739
740 status = -ENODEV;
741
742 /* allocate instance-specific endpoints */
33376c1c 743 ep = usb_ep_autoconfig(cdev->gadget, &fs_ecm_in_desc);
da741b8c
DB		 744 if (!ep)
745 goto fail;
746 ecm->port.in_ep = ep;
da741b8c 747
33376c1c 748 ep = usb_ep_autoconfig(cdev->gadget, &fs_ecm_out_desc);
da741b8c
DB		 749 if (!ep)
750 goto fail;
751 ecm->port.out_ep = ep;
da741b8c
DB		 752
753 /* NOTE: a status/notification endpoint is *OPTIONAL* but we
754 * don't treat it that way. It's simpler, and some newer CDC
755 * profiles (wireless handsets) no longer treat it as optional.
756 */
33376c1c 757 ep = usb_ep_autoconfig(cdev->gadget, &fs_ecm_notify_desc);
da741b8c
DB		 758 if (!ep)
759 goto fail;
760 ecm->notify = ep;
da741b8c
DB		 761
762 status = -ENOMEM;
763
764 /* allocate notification request and buffer */
765 ecm->notify_req = usb_ep_alloc_request(ep, GFP_KERNEL);
766 if (!ecm->notify_req)
767 goto fail;
33376c1c 768 ecm->notify_req->buf = kmalloc(ECM_STATUS_BYTECOUNT, GFP_KERNEL);
da741b8c
DB		 769 if (!ecm->notify_req->buf)
770 goto fail;
771 ecm->notify_req->context = ecm;
772 ecm->notify_req->complete = ecm_notify_complete;
773
da741b8c
DB		 774 /* support all relevant hardware speeds... we expect that when
775 * hardware is dual speed, all bulk-capable endpoints work at
776 * both speeds
777 */
10287bae
SAS		 778 hs_ecm_in_desc.bEndpointAddress = fs_ecm_in_desc.bEndpointAddress;
779 hs_ecm_out_desc.bEndpointAddress = fs_ecm_out_desc.bEndpointAddress;
780 hs_ecm_notify_desc.bEndpointAddress =
781 fs_ecm_notify_desc.bEndpointAddress;
782
783 ss_ecm_in_desc.bEndpointAddress = fs_ecm_in_desc.bEndpointAddress;
784 ss_ecm_out_desc.bEndpointAddress = fs_ecm_out_desc.bEndpointAddress;
785 ss_ecm_notify_desc.bEndpointAddress =
786 fs_ecm_notify_desc.bEndpointAddress;
787
788 status = usb_assign_descriptors(f, ecm_fs_function, ecm_hs_function,
eaef50c7 789 ecm_ss_function, NULL);
10287bae
SAS		 790 if (status)
791 goto fail;
04617db7 792
da741b8c
DB		 793 /* NOTE: all that is done without knowing or caring about
794 * the network link ... which is unavailable to this code
795 * until we're activated via set_alt().
796 */
797
798 ecm->port.open = ecm_open;
799 ecm->port.close = ecm_close;
800
801 DBG(cdev, "CDC Ethernet: %s speed IN/%s OUT/%s NOTIFY/%s\n",
04617db7 802 gadget_is_superspeed(c->cdev->gadget) ? "super" :
da741b8c
DB		 803 gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
804 ecm->port.in_ep->name, ecm->port.out_ep->name,
805 ecm->notify->name);
806 return 0;
807
808fail:
da741b8c
DB		 809 if (ecm->notify_req) {
810 kfree(ecm->notify_req->buf);
811 usb_ep_free_request(ecm->notify, ecm->notify_req);
812 }
813
da741b8c
DB		 814 ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);
815
816 return status;
817}
818
da92801c
AP		 819static inline struct f_ecm_opts *to_f_ecm_opts(struct config_item *item)
820{
821 return container_of(to_config_group(item), struct f_ecm_opts,
822 func_inst.group);
823}
824
825/* f_ecm_item_ops */
826USB_ETHERNET_CONFIGFS_ITEM(ecm);
827
828/* f_ecm_opts_dev_addr */
829USB_ETHERNET_CONFIGFS_ITEM_ATTR_DEV_ADDR(ecm);
830
831/* f_ecm_opts_host_addr */
832USB_ETHERNET_CONFIGFS_ITEM_ATTR_HOST_ADDR(ecm);
833
834/* f_ecm_opts_qmult */
835USB_ETHERNET_CONFIGFS_ITEM_ATTR_QMULT(ecm);
836
837/* f_ecm_opts_ifname */
838USB_ETHERNET_CONFIGFS_ITEM_ATTR_IFNAME(ecm);
839
840static struct configfs_attribute *ecm_attrs[] = {
f9a63da3
CH		 841 &ecm_opts_attr_dev_addr,
842 &ecm_opts_attr_host_addr,
843 &ecm_opts_attr_qmult,
844 &ecm_opts_attr_ifname,
da92801c
AP		 845 NULL,
846};
847
848static struct config_item_type ecm_func_type = {
849 .ct_item_ops = &ecm_item_ops,
850 .ct_attrs = ecm_attrs,
851 .ct_owner = THIS_MODULE,
852};
853
fee562a6
AP		 854static void ecm_free_inst(struct usb_function_instance *f)
855{
856 struct f_ecm_opts *opts;
857
858 opts = container_of(f, struct f_ecm_opts, func_inst);
859 if (opts->bound)
860 gether_cleanup(netdev_priv(opts->net));
861 else
862 free_netdev(opts->net);
863 kfree(opts);
864}
865
866static struct usb_function_instance *ecm_alloc_inst(void)
867{
868 struct f_ecm_opts *opts;
869
870 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
871 if (!opts)
872 return ERR_PTR(-ENOMEM);
da92801c 873 mutex_init(&opts->lock);
fee562a6
AP		 874 opts->func_inst.free_func_inst = ecm_free_inst;
875 opts->net = gether_setup_default();
172d934c
AP		 876 if (IS_ERR(opts->net)) {
877 struct net_device *net = opts->net;
878 kfree(opts);
879 return ERR_CAST(net);
880 }
fee562a6 881
da92801c
AP		 882 config_group_init_type_name(&opts->func_inst.group, "", &ecm_func_type);
883
fee562a6
AP		 884 return &opts->func_inst;
885}
886
887static void ecm_free(struct usb_function *f)
888{
889 struct f_ecm *ecm;
da92801c 890 struct f_ecm_opts *opts;
fee562a6
AP		 891
892 ecm = func_to_ecm(f);
da92801c 893 opts = container_of(f->fi, struct f_ecm_opts, func_inst);
fee562a6 894 kfree(ecm);
da92801c
AP		 895 mutex_lock(&opts->lock);
896 opts->refcnt--;
897 mutex_unlock(&opts->lock);
fee562a6
AP		 898}
899
900static void ecm_unbind(struct usb_configuration *c, struct usb_function *f)
901{
902 struct f_ecm *ecm = func_to_ecm(f);
903
904 DBG(c->cdev, "ecm unbind\n");
905
fee562a6
AP		 906 usb_free_all_descriptors(f);
907
908 kfree(ecm->notify_req->buf);
909 usb_ep_free_request(ecm->notify, ecm->notify_req);
910}
911
0f0392f2 912static struct usb_function *ecm_alloc(struct usb_function_instance *fi)
fee562a6
AP		 913{
914 struct f_ecm *ecm;
915 struct f_ecm_opts *opts;
916 int status;
917
918 /* allocate and initialize one new instance */
919 ecm = kzalloc(sizeof(*ecm), GFP_KERNEL);
920 if (!ecm)
921 return ERR_PTR(-ENOMEM);
922
923 opts = container_of(fi, struct f_ecm_opts, func_inst);
da92801c
AP		 924 mutex_lock(&opts->lock);
925 opts->refcnt++;
fee562a6
AP		 926
927 /* export host's Ethernet address in CDC format */
928 status = gether_get_host_addr_cdc(opts->net, ecm->ethaddr,
929 sizeof(ecm->ethaddr));
930 if (status < 12) {
931 kfree(ecm);
2a98dbbc 932 mutex_unlock(&opts->lock);
fee562a6
AP		 933 return ERR_PTR(-EINVAL);
934 }
935 ecm_string_defs[1].s = ecm->ethaddr;
936
937 ecm->port.ioport = netdev_priv(opts->net);
da92801c 938 mutex_unlock(&opts->lock);
fee562a6
AP		 939 ecm->port.cdc_filter = DEFAULT_FILTER;
940
941 ecm->port.func.name = "cdc_ethernet";
fee562a6
AP		 942 /* descriptors are per-instance copies */
943 ecm->port.func.bind = ecm_bind;
944 ecm->port.func.unbind = ecm_unbind;
945 ecm->port.func.set_alt = ecm_set_alt;
946 ecm->port.func.get_alt = ecm_get_alt;
947 ecm->port.func.setup = ecm_setup;
948 ecm->port.func.disable = ecm_disable;
949 ecm->port.func.free_func = ecm_free;
950
951 return &ecm->port.func;
952}
953
954DECLARE_USB_FUNCTION_INIT(ecm, ecm_alloc_inst, ecm_alloc);
955MODULE_LICENSE("GPL");
956MODULE_AUTHOR("David Brownell");
Linux kernel - Deliverables
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