USB-CDC: Move struct declaration before its use
[platform/kernel/u-boot.git] / drivers / usb / gadget / ether.c
1 /*
2  * ether.c -- Ethernet gadget driver, with CDC and non-CDC options
3  *
4  * Copyright (C) 2003-2005,2008 David Brownell
5  * Copyright (C) 2003-2004 Robert Schwebel, Benedikt Spranger
6  * Copyright (C) 2008 Nokia Corporation
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.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
21  */
22
23 #include <common.h>
24 #include <asm/errno.h>
25 #include <linux/netdevice.h>
26 #include <linux/usb/ch9.h>
27 #include <linux/usb/cdc.h>
28 #include <linux/usb/gadget.h>
29 #include <net.h>
30 #include <linux/ctype.h>
31
32 #include "gadget_chips.h"
33
34 #define USB_NET_NAME "usb_ether"
35
36 #define atomic_read
37 extern struct platform_data brd;
38 #define spin_lock(x)
39 #define spin_unlock(x)
40
41
42 unsigned packet_received, packet_sent;
43
44 #define DEV_CONFIG_CDC  1
45 #define GFP_ATOMIC ((gfp_t) 0)
46 #define GFP_KERNEL ((gfp_t) 0)
47
48 /*
49  * Ethernet gadget driver -- with CDC and non-CDC options
50  * Builds on hardware support for a full duplex link.
51  *
52  * CDC Ethernet is the standard USB solution for sending Ethernet frames
53  * using USB.  Real hardware tends to use the same framing protocol but look
54  * different for control features.  This driver strongly prefers to use
55  * this USB-IF standard as its open-systems interoperability solution;
56  * most host side USB stacks (except from Microsoft) support it.
57  *
58  * This is sometimes called "CDC ECM" (Ethernet Control Model) to support
59  * TLA-soup.  "CDC ACM" (Abstract Control Model) is for modems, and a new
60  * "CDC EEM" (Ethernet Emulation Model) is starting to spread.
61  *
62  * There's some hardware that can't talk CDC ECM.  We make that hardware
63  * implement a "minimalist" vendor-agnostic CDC core:  same framing, but
64  * link-level setup only requires activating the configuration.  Only the
65  * endpoint descriptors, and product/vendor IDs, are relevant; no control
66  * operations are available.  Linux supports it, but other host operating
67  * systems may not.  (This is a subset of CDC Ethernet.)
68  *
69  * It turns out that if you add a few descriptors to that "CDC Subset",
70  * (Windows) host side drivers from MCCI can treat it as one submode of
71  * a proprietary scheme called "SAFE" ... without needing to know about
72  * specific product/vendor IDs.  So we do that, making it easier to use
73  * those MS-Windows drivers.  Those added descriptors make it resemble a
74  * CDC MDLM device, but they don't change device behavior at all.  (See
75  * MCCI Engineering report 950198 "SAFE Networking Functions".)
76  *
77  * A third option is also in use.  Rather than CDC Ethernet, or something
78  * simpler, Microsoft pushes their own approach: RNDIS.  The published
79  * RNDIS specs are ambiguous and appear to be incomplete, and are also
80  * needlessly complex.  They borrow more from CDC ACM than CDC ECM.
81  */
82 #define ETH_ALEN        6               /* Octets in one ethernet addr   */
83 #define ETH_HLEN        14              /* Total octets in header.       */
84 #define ETH_ZLEN        60              /* Min. octets in frame sans FCS */
85 #define ETH_DATA_LEN    1500            /* Max. octets in payload        */
86 #define ETH_FRAME_LEN   PKTSIZE_ALIGN   /* Max. octets in frame sans FCS */
87 #define ETH_FCS_LEN     4               /* Octets in the FCS             */
88
89 #define DRIVER_DESC             "Ethernet Gadget"
90 /* Based on linux 2.6.27 version */
91 #define DRIVER_VERSION          "May Day 2005"
92
93 static const char shortname[] = "ether";
94 static const char driver_desc[] = DRIVER_DESC;
95
96 #define RX_EXTRA        20              /* guard against rx overflows */
97
98 /* CDC support the same host-chosen outgoing packet filters. */
99 #define DEFAULT_FILTER  (USB_CDC_PACKET_TYPE_BROADCAST \
100                         |USB_CDC_PACKET_TYPE_ALL_MULTICAST \
101                         |USB_CDC_PACKET_TYPE_PROMISCUOUS \
102                         |USB_CDC_PACKET_TYPE_DIRECTED)
103
104 #define USB_CONNECT_TIMEOUT (3 * CONFIG_SYS_HZ)
105
106 /*-------------------------------------------------------------------------*/
107
108 struct eth_dev {
109         struct usb_gadget       *gadget;
110         struct usb_request      *req;           /* for control responses */
111         struct usb_request      *stat_req;      /* for cdc status */
112
113         u8                      config;
114         struct usb_ep           *in_ep, *out_ep, *status_ep;
115         const struct usb_endpoint_descriptor
116                                 *in, *out, *status;
117
118         struct usb_request      *tx_req, *rx_req;
119
120         struct eth_device       *net;
121         struct net_device_stats stats;
122         unsigned int            tx_qlen;
123
124         unsigned                zlp:1;
125         unsigned                cdc:1;
126         unsigned                suspended:1;
127         unsigned                network_started:1;
128         u16                     cdc_filter;
129         unsigned long           todo;
130         int                     mtu;
131 #define WORK_RX_MEMORY          0
132         u8                      host_mac[ETH_ALEN];
133 };
134
135 /*
136  * This version autoconfigures as much as possible at run-time.
137  *
138  * It also ASSUMES a self-powered device, without remote wakeup,
139  * although remote wakeup support would make sense.
140  */
141
142 /*-------------------------------------------------------------------------*/
143 static struct eth_dev l_ethdev;
144 static struct eth_device l_netdev;
145 static struct usb_gadget_driver eth_driver;
146
147 /*-------------------------------------------------------------------------*/
148
149 /* "main" config is either CDC, or its simple subset */
150 static inline int is_cdc(struct eth_dev *dev)
151 {
152 #if     !defined(DEV_CONFIG_SUBSET)
153         return 1;               /* only cdc possible */
154 #elif   !defined(DEV_CONFIG_CDC)
155         return 0;               /* only subset possible */
156 #else
157         return dev->cdc;        /* depends on what hardware we found */
158 #endif
159 }
160
161 #define subset_active(dev)      (!is_cdc(dev))
162 #define cdc_active(dev)         (is_cdc(dev))
163
164 #define DEFAULT_QLEN    2       /* double buffering by default */
165
166 /* peak bulk transfer bits-per-second */
167 #define HS_BPS          (13 * 512 * 8 * 1000 * 8)
168 #define FS_BPS          (19 *  64 * 1 * 1000 * 8)
169
170 #ifdef CONFIG_USB_GADGET_DUALSPEED
171 #define DEVSPEED        USB_SPEED_HIGH
172
173 #ifdef CONFIG_USB_ETH_QMULT
174 #define qmult CONFIG_USB_ETH_QMULT
175 #else
176 #define qmult 5
177 #endif
178
179 /* for dual-speed hardware, use deeper queues at highspeed */
180 #define qlen(gadget) \
181         (DEFAULT_QLEN*((gadget->speed == USB_SPEED_HIGH) ? qmult : 1))
182
183 static inline int BITRATE(struct usb_gadget *g)
184 {
185         return (g->speed == USB_SPEED_HIGH) ? HS_BPS : FS_BPS;
186 }
187
188 #else   /* full speed (low speed doesn't do bulk) */
189
190 #define qmult           1
191
192 #define DEVSPEED        USB_SPEED_FULL
193
194 #define qlen(gadget) DEFAULT_QLEN
195
196 static inline int BITRATE(struct usb_gadget *g)
197 {
198         return FS_BPS;
199 }
200 #endif
201
202 /*-------------------------------------------------------------------------*/
203
204 /*
205  * DO NOT REUSE THESE IDs with a protocol-incompatible driver!!  Ever!!
206  * Instead:  allocate your own, using normal USB-IF procedures.
207  */
208
209 /*
210  * Thanks to NetChip Technologies for donating this product ID.
211  * It's for devices with only CDC Ethernet configurations.
212  */
213 #define CDC_VENDOR_NUM          0x0525  /* NetChip */
214 #define CDC_PRODUCT_NUM         0xa4a1  /* Linux-USB Ethernet Gadget */
215
216 /*
217  * For hardware that can't talk CDC, we use the same vendor ID that
218  * ARM Linux has used for ethernet-over-usb, both with sa1100 and
219  * with pxa250.  We're protocol-compatible, if the host-side drivers
220  * use the endpoint descriptors.  bcdDevice (version) is nonzero, so
221  * drivers that need to hard-wire endpoint numbers have a hook.
222  *
223  * The protocol is a minimal subset of CDC Ether, which works on any bulk
224  * hardware that's not deeply broken ... even on hardware that can't talk
225  * RNDIS (like SA-1100, with no interrupt endpoint, or anything that
226  * doesn't handle control-OUT).
227  */
228 #define SIMPLE_VENDOR_NUM       0x049f
229 #define SIMPLE_PRODUCT_NUM      0x505a
230
231 /*
232  * Some systems will want different product identifers published in the
233  * device descriptor, either numbers or strings or both.  These string
234  * parameters are in UTF-8 (superset of ASCII's 7 bit characters).
235  */
236
237 static ushort bcdDevice;
238 #if defined(CONFIG_USBNET_MANUFACTURER)
239 static char *iManufacturer = CONFIG_USBNET_MANUFACTURER;
240 #else
241 static char *iManufacturer = "U-boot";
242 #endif
243 static char *iProduct;
244 static char *iSerialNumber;
245 static char dev_addr[18];
246 static char host_addr[18];
247
248 /*-------------------------------------------------------------------------*/
249
250 /*
251  * USB DRIVER HOOKUP (to the hardware driver, below us), mostly
252  * ep0 implementation:  descriptors, config management, setup().
253  * also optional class-specific notification interrupt transfer.
254  */
255
256 /*
257  * DESCRIPTORS ... most are static, but strings and (full) configuration
258  * descriptors are built on demand.  For now we do either full CDC, or
259  * our simple subset.
260  */
261
262 #define STRING_MANUFACTURER             1
263 #define STRING_PRODUCT                  2
264 #define STRING_ETHADDR                  3
265 #define STRING_DATA                     4
266 #define STRING_CONTROL                  5
267 #define STRING_CDC                      7
268 #define STRING_SUBSET                   8
269 #define STRING_SERIALNUMBER             10
270
271 /* holds our biggest descriptor */
272 #define USB_BUFSIZ      256
273
274 /*
275  * This device advertises one configuration, eth_config,
276  * on hardware supporting at least two configs.
277  *
278  * FIXME define some higher-powered configurations to make it easier
279  * to recharge batteries ...
280  */
281
282 #define DEV_CONFIG_VALUE        1       /* cdc or subset */
283
284 static struct usb_device_descriptor
285 device_desc = {
286         .bLength =              sizeof device_desc,
287         .bDescriptorType =      USB_DT_DEVICE,
288
289         .bcdUSB =               __constant_cpu_to_le16(0x0200),
290
291         .bDeviceClass =         USB_CLASS_COMM,
292         .bDeviceSubClass =      0,
293         .bDeviceProtocol =      0,
294
295         .idVendor =             __constant_cpu_to_le16(CDC_VENDOR_NUM),
296         .idProduct =            __constant_cpu_to_le16(CDC_PRODUCT_NUM),
297         .iManufacturer =        STRING_MANUFACTURER,
298         .iProduct =             STRING_PRODUCT,
299         .bNumConfigurations =   1,
300 };
301
302 static struct usb_otg_descriptor
303 otg_descriptor = {
304         .bLength =              sizeof otg_descriptor,
305         .bDescriptorType =      USB_DT_OTG,
306
307         .bmAttributes =         USB_OTG_SRP,
308 };
309
310 static struct usb_config_descriptor
311 eth_config = {
312         .bLength =              sizeof eth_config,
313         .bDescriptorType =      USB_DT_CONFIG,
314
315         /* compute wTotalLength on the fly */
316         .bNumInterfaces =       2,
317         .bConfigurationValue =  DEV_CONFIG_VALUE,
318         .iConfiguration =       STRING_CDC,
319         .bmAttributes =         USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
320         .bMaxPower =            1,
321 };
322
323 /*
324  * Compared to the simple CDC subset, the full CDC Ethernet model adds
325  * three class descriptors, two interface descriptors, optional status
326  * endpoint.  Both have a "data" interface and two bulk endpoints.
327  * There are also differences in how control requests are handled.
328  */
329
330 #ifdef  DEV_CONFIG_CDC
331 static struct usb_interface_descriptor
332 control_intf = {
333         .bLength =              sizeof control_intf,
334         .bDescriptorType =      USB_DT_INTERFACE,
335
336         .bInterfaceNumber =     0,
337         /* status endpoint is optional; this may be patched later */
338         .bNumEndpoints =        1,
339         .bInterfaceClass =      USB_CLASS_COMM,
340         .bInterfaceSubClass =   USB_CDC_SUBCLASS_ETHERNET,
341         .bInterfaceProtocol =   USB_CDC_PROTO_NONE,
342         .iInterface =           STRING_CONTROL,
343 };
344 #endif
345
346 static const struct usb_cdc_header_desc header_desc = {
347         .bLength =              sizeof header_desc,
348         .bDescriptorType =      USB_DT_CS_INTERFACE,
349         .bDescriptorSubType =   USB_CDC_HEADER_TYPE,
350
351         .bcdCDC =               __constant_cpu_to_le16(0x0110),
352 };
353
354 #if defined(DEV_CONFIG_CDC)
355
356 static const struct usb_cdc_union_desc union_desc = {
357         .bLength =              sizeof union_desc,
358         .bDescriptorType =      USB_DT_CS_INTERFACE,
359         .bDescriptorSubType =   USB_CDC_UNION_TYPE,
360
361         .bMasterInterface0 =    0,      /* index of control interface */
362         .bSlaveInterface0 =     1,      /* index of DATA interface */
363 };
364
365 #endif  /* CDC */
366
367 #ifndef DEV_CONFIG_CDC
368
369 /*
370  * "SAFE" loosely follows CDC WMC MDLM, violating the spec in various
371  * ways:  data endpoints live in the control interface, there's no data
372  * interface, and it's not used to talk to a cell phone radio.
373  */
374
375 static const struct usb_cdc_mdlm_desc mdlm_desc = {
376         .bLength =              sizeof mdlm_desc,
377         .bDescriptorType =      USB_DT_CS_INTERFACE,
378         .bDescriptorSubType =   USB_CDC_MDLM_TYPE,
379
380         .bcdVersion =           __constant_cpu_to_le16(0x0100),
381         .bGUID = {
382                 0x5d, 0x34, 0xcf, 0x66, 0x11, 0x18, 0x11, 0xd6,
383                 0xa2, 0x1a, 0x00, 0x01, 0x02, 0xca, 0x9a, 0x7f,
384         },
385 };
386
387 /*
388  * since "usb_cdc_mdlm_detail_desc" is a variable length structure, we
389  * can't really use its struct.  All we do here is say that we're using
390  * the submode of "SAFE" which directly matches the CDC Subset.
391  */
392 static const u8 mdlm_detail_desc[] = {
393         6,
394         USB_DT_CS_INTERFACE,
395         USB_CDC_MDLM_DETAIL_TYPE,
396
397         0,      /* "SAFE" */
398         0,      /* network control capabilities (none) */
399         0,      /* network data capabilities ("raw" encapsulation) */
400 };
401
402 #endif
403
404 static const struct usb_cdc_ether_desc ether_desc = {
405         .bLength =              sizeof(ether_desc),
406         .bDescriptorType =      USB_DT_CS_INTERFACE,
407         .bDescriptorSubType =   USB_CDC_ETHERNET_TYPE,
408
409         /* this descriptor actually adds value, surprise! */
410         .iMACAddress =          STRING_ETHADDR,
411         .bmEthernetStatistics = __constant_cpu_to_le32(0), /* no statistics */
412         .wMaxSegmentSize =      __constant_cpu_to_le16(ETH_FRAME_LEN),
413         .wNumberMCFilters =     __constant_cpu_to_le16(0),
414         .bNumberPowerFilters =  0,
415 };
416
417 #if defined(DEV_CONFIG_CDC)
418
419 /*
420  * include the status endpoint if we can, even where it's optional.
421  * use wMaxPacketSize big enough to fit CDC_NOTIFY_SPEED_CHANGE in one
422  * packet, to simplify cancellation; and a big transfer interval, to
423  * waste less bandwidth.
424  *
425  * some drivers (like Linux 2.4 cdc-ether!) "need" it to exist even
426  * if they ignore the connect/disconnect notifications that real aether
427  * can provide.  more advanced cdc configurations might want to support
428  * encapsulated commands (vendor-specific, using control-OUT).
429  */
430
431 #define LOG2_STATUS_INTERVAL_MSEC       5       /* 1 << 5 == 32 msec */
432 #define STATUS_BYTECOUNT                16      /* 8 byte header + data */
433
434 static struct usb_endpoint_descriptor
435 fs_status_desc = {
436         .bLength =              USB_DT_ENDPOINT_SIZE,
437         .bDescriptorType =      USB_DT_ENDPOINT,
438
439         .bEndpointAddress =     USB_DIR_IN,
440         .bmAttributes =         USB_ENDPOINT_XFER_INT,
441         .wMaxPacketSize =       __constant_cpu_to_le16(STATUS_BYTECOUNT),
442         .bInterval =            1 << LOG2_STATUS_INTERVAL_MSEC,
443 };
444 #endif
445
446 #ifdef  DEV_CONFIG_CDC
447
448 /* the default data interface has no endpoints ... */
449
450 static const struct usb_interface_descriptor
451 data_nop_intf = {
452         .bLength =              sizeof data_nop_intf,
453         .bDescriptorType =      USB_DT_INTERFACE,
454
455         .bInterfaceNumber =     1,
456         .bAlternateSetting =    0,
457         .bNumEndpoints =        0,
458         .bInterfaceClass =      USB_CLASS_CDC_DATA,
459         .bInterfaceSubClass =   0,
460         .bInterfaceProtocol =   0,
461 };
462
463 /* ... but the "real" data interface has two bulk endpoints */
464
465 static const struct usb_interface_descriptor
466 data_intf = {
467         .bLength =              sizeof data_intf,
468         .bDescriptorType =      USB_DT_INTERFACE,
469
470         .bInterfaceNumber =     1,
471         .bAlternateSetting =    1,
472         .bNumEndpoints =        2,
473         .bInterfaceClass =      USB_CLASS_CDC_DATA,
474         .bInterfaceSubClass =   0,
475         .bInterfaceProtocol =   0,
476         .iInterface =           STRING_DATA,
477 };
478
479 #endif
480
481 #ifdef DEV_CONFIG_SUBSET
482
483 /*
484  * "Simple" CDC-subset option is a simple vendor-neutral model that most
485  * full speed controllers can handle:  one interface, two bulk endpoints.
486  *
487  * To assist host side drivers, we fancy it up a bit, and add descriptors
488  * so some host side drivers will understand it as a "SAFE" variant.
489  */
490
491 static const struct usb_interface_descriptor
492 subset_data_intf = {
493         .bLength =              sizeof subset_data_intf,
494         .bDescriptorType =      USB_DT_INTERFACE,
495
496         .bInterfaceNumber =     0,
497         .bAlternateSetting =    0,
498         .bNumEndpoints =        2,
499         .bInterfaceClass =      USB_CLASS_COMM,
500         .bInterfaceSubClass =   USB_CDC_SUBCLASS_MDLM,
501         .bInterfaceProtocol =   0,
502         .iInterface =           STRING_DATA,
503 };
504
505 #endif  /* SUBSET */
506
507 static struct usb_endpoint_descriptor
508 fs_source_desc = {
509         .bLength =              USB_DT_ENDPOINT_SIZE,
510         .bDescriptorType =      USB_DT_ENDPOINT,
511
512         .bEndpointAddress =     USB_DIR_IN,
513         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
514 };
515
516 static struct usb_endpoint_descriptor
517 fs_sink_desc = {
518         .bLength =              USB_DT_ENDPOINT_SIZE,
519         .bDescriptorType =      USB_DT_ENDPOINT,
520
521         .bEndpointAddress =     USB_DIR_OUT,
522         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
523 };
524
525 static const struct usb_descriptor_header *fs_eth_function[11] = {
526         (struct usb_descriptor_header *) &otg_descriptor,
527 #ifdef DEV_CONFIG_CDC
528         /* "cdc" mode descriptors */
529         (struct usb_descriptor_header *) &control_intf,
530         (struct usb_descriptor_header *) &header_desc,
531         (struct usb_descriptor_header *) &union_desc,
532         (struct usb_descriptor_header *) &ether_desc,
533         /* NOTE: status endpoint may need to be removed */
534         (struct usb_descriptor_header *) &fs_status_desc,
535         /* data interface, with altsetting */
536         (struct usb_descriptor_header *) &data_nop_intf,
537         (struct usb_descriptor_header *) &data_intf,
538         (struct usb_descriptor_header *) &fs_source_desc,
539         (struct usb_descriptor_header *) &fs_sink_desc,
540         NULL,
541 #endif /* DEV_CONFIG_CDC */
542 };
543
544 static inline void fs_subset_descriptors(void)
545 {
546 #ifdef DEV_CONFIG_SUBSET
547         /* behavior is "CDC Subset"; extra descriptors say "SAFE" */
548         fs_eth_function[1] = (struct usb_descriptor_header *) &subset_data_intf;
549         fs_eth_function[2] = (struct usb_descriptor_header *) &header_desc;
550         fs_eth_function[3] = (struct usb_descriptor_header *) &mdlm_desc;
551         fs_eth_function[4] = (struct usb_descriptor_header *) &mdlm_detail_desc;
552         fs_eth_function[5] = (struct usb_descriptor_header *) &ether_desc;
553         fs_eth_function[6] = (struct usb_descriptor_header *) &fs_source_desc;
554         fs_eth_function[7] = (struct usb_descriptor_header *) &fs_sink_desc;
555         fs_eth_function[8] = NULL;
556 #else
557         fs_eth_function[1] = NULL;
558 #endif
559 }
560
561 /*
562  * usb 2.0 devices need to expose both high speed and full speed
563  * descriptors, unless they only run at full speed.
564  */
565
566 #if defined(DEV_CONFIG_CDC)
567 static struct usb_endpoint_descriptor
568 hs_status_desc = {
569         .bLength =              USB_DT_ENDPOINT_SIZE,
570         .bDescriptorType =      USB_DT_ENDPOINT,
571
572         .bmAttributes =         USB_ENDPOINT_XFER_INT,
573         .wMaxPacketSize =       __constant_cpu_to_le16(STATUS_BYTECOUNT),
574         .bInterval =            LOG2_STATUS_INTERVAL_MSEC + 4,
575 };
576 #endif /* DEV_CONFIG_CDC */
577
578 static struct usb_endpoint_descriptor
579 hs_source_desc = {
580         .bLength =              USB_DT_ENDPOINT_SIZE,
581         .bDescriptorType =      USB_DT_ENDPOINT,
582
583         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
584         .wMaxPacketSize =       __constant_cpu_to_le16(512),
585 };
586
587 static struct usb_endpoint_descriptor
588 hs_sink_desc = {
589         .bLength =              USB_DT_ENDPOINT_SIZE,
590         .bDescriptorType =      USB_DT_ENDPOINT,
591
592         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
593         .wMaxPacketSize =       __constant_cpu_to_le16(512),
594 };
595
596 static struct usb_qualifier_descriptor
597 dev_qualifier = {
598         .bLength =              sizeof dev_qualifier,
599         .bDescriptorType =      USB_DT_DEVICE_QUALIFIER,
600
601         .bcdUSB =               __constant_cpu_to_le16(0x0200),
602         .bDeviceClass =         USB_CLASS_COMM,
603
604         .bNumConfigurations =   1,
605 };
606
607 static const struct usb_descriptor_header *hs_eth_function[11] = {
608         (struct usb_descriptor_header *) &otg_descriptor,
609 #ifdef DEV_CONFIG_CDC
610         /* "cdc" mode descriptors */
611         (struct usb_descriptor_header *) &control_intf,
612         (struct usb_descriptor_header *) &header_desc,
613         (struct usb_descriptor_header *) &union_desc,
614         (struct usb_descriptor_header *) &ether_desc,
615         /* NOTE: status endpoint may need to be removed */
616         (struct usb_descriptor_header *) &hs_status_desc,
617         /* data interface, with altsetting */
618         (struct usb_descriptor_header *) &data_nop_intf,
619         (struct usb_descriptor_header *) &data_intf,
620         (struct usb_descriptor_header *) &hs_source_desc,
621         (struct usb_descriptor_header *) &hs_sink_desc,
622         NULL,
623 #endif /* DEV_CONFIG_CDC */
624 };
625
626 static inline void hs_subset_descriptors(void)
627 {
628 #ifdef DEV_CONFIG_SUBSET
629         /* behavior is "CDC Subset"; extra descriptors say "SAFE" */
630         hs_eth_function[1] = (struct usb_descriptor_header *) &subset_data_intf;
631         hs_eth_function[2] = (struct usb_descriptor_header *) &header_desc;
632         hs_eth_function[3] = (struct usb_descriptor_header *) &mdlm_desc;
633         hs_eth_function[4] = (struct usb_descriptor_header *) &mdlm_detail_desc;
634         hs_eth_function[5] = (struct usb_descriptor_header *) &ether_desc;
635         hs_eth_function[6] = (struct usb_descriptor_header *) &hs_source_desc;
636         hs_eth_function[7] = (struct usb_descriptor_header *) &hs_sink_desc;
637         hs_eth_function[8] = NULL;
638 #else
639         hs_eth_function[1] = NULL;
640 #endif
641 }
642
643 /* maxpacket and other transfer characteristics vary by speed. */
644 static inline struct usb_endpoint_descriptor *
645 ep_desc(struct usb_gadget *g, struct usb_endpoint_descriptor *hs,
646                 struct usb_endpoint_descriptor *fs)
647 {
648         if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
649                 return hs;
650         return fs;
651 }
652
653 /*-------------------------------------------------------------------------*/
654
655 /* descriptors that are built on-demand */
656
657 static char manufacturer[50];
658 static char product_desc[40] = DRIVER_DESC;
659 static char serial_number[20];
660
661 /* address that the host will use ... usually assigned at random */
662 static char ethaddr[2 * ETH_ALEN + 1];
663
664 /* static strings, in UTF-8 */
665 static struct usb_string                strings[] = {
666         { STRING_MANUFACTURER,  manufacturer, },
667         { STRING_PRODUCT,       product_desc, },
668         { STRING_SERIALNUMBER,  serial_number, },
669         { STRING_DATA,          "Ethernet Data", },
670         { STRING_ETHADDR,       ethaddr, },
671 #ifdef  DEV_CONFIG_CDC
672         { STRING_CDC,           "CDC Ethernet", },
673         { STRING_CONTROL,       "CDC Communications Control", },
674 #endif
675 #ifdef  DEV_CONFIG_SUBSET
676         { STRING_SUBSET,        "CDC Ethernet Subset", },
677 #endif
678         {  }            /* end of list */
679 };
680
681 static struct usb_gadget_strings        stringtab = {
682         .language       = 0x0409,       /* en-us */
683         .strings        = strings,
684 };
685
686 /*============================================================================*/
687 static u8 control_req[USB_BUFSIZ];
688 static u8 status_req[STATUS_BYTECOUNT] __attribute__ ((aligned(4)));
689
690
691 /**
692  * strlcpy - Copy a %NUL terminated string into a sized buffer
693  * @dest: Where to copy the string to
694  * @src: Where to copy the string from
695  * @size: size of destination buffer
696  *
697  * Compatible with *BSD: the result is always a valid
698  * NUL-terminated string that fits in the buffer (unless,
699  * of course, the buffer size is zero). It does not pad
700  * out the result like strncpy() does.
701  */
702 size_t strlcpy(char *dest, const char *src, size_t size)
703 {
704         size_t ret = strlen(src);
705
706         if (size) {
707                 size_t len = (ret >= size) ? size - 1 : ret;
708                 memcpy(dest, src, len);
709                 dest[len] = '\0';
710         }
711         return ret;
712 }
713
714 /*============================================================================*/
715
716 /*
717  * one config, two interfaces:  control, data.
718  * complications: class descriptors, and an altsetting.
719  */
720 static int
721 config_buf(struct usb_gadget *g, u8 *buf, u8 type, unsigned index, int is_otg)
722 {
723         int                                     len;
724         const struct usb_config_descriptor      *config;
725         const struct usb_descriptor_header      **function;
726         int                                     hs = 0;
727
728         if (gadget_is_dualspeed(g)) {
729                 hs = (g->speed == USB_SPEED_HIGH);
730                 if (type == USB_DT_OTHER_SPEED_CONFIG)
731                         hs = !hs;
732         }
733 #define which_fn(t)     (hs ? hs_ ## t ## _function : fs_ ## t ## _function)
734
735         if (index >= device_desc.bNumConfigurations)
736                 return -EINVAL;
737
738         config = &eth_config;
739         function = which_fn(eth);
740
741         /* for now, don't advertise srp-only devices */
742         if (!is_otg)
743                 function++;
744
745         len = usb_gadget_config_buf(config, buf, USB_BUFSIZ, function);
746         if (len < 0)
747                 return len;
748         ((struct usb_config_descriptor *) buf)->bDescriptorType = type;
749         return len;
750 }
751
752 /*-------------------------------------------------------------------------*/
753
754 static int alloc_requests(struct eth_dev *dev, unsigned n, gfp_t gfp_flags);
755
756 static int
757 set_ether_config(struct eth_dev *dev, gfp_t gfp_flags)
758 {
759         int                                     result = 0;
760         struct usb_gadget                       *gadget = dev->gadget;
761
762 #if defined(DEV_CONFIG_CDC)
763         /* status endpoint used for (optionally) CDC */
764         if (!subset_active(dev) && dev->status_ep) {
765                 dev->status = ep_desc(gadget, &hs_status_desc,
766                                                 &fs_status_desc);
767                 dev->status_ep->driver_data = dev;
768
769                 result = usb_ep_enable(dev->status_ep, dev->status);
770                 if (result != 0) {
771                         debug("enable %s --> %d\n",
772                                 dev->status_ep->name, result);
773                         goto done;
774                 }
775         }
776 #endif
777
778         dev->in = ep_desc(gadget, &hs_source_desc, &fs_source_desc);
779         dev->in_ep->driver_data = dev;
780
781         dev->out = ep_desc(gadget, &hs_sink_desc, &fs_sink_desc);
782         dev->out_ep->driver_data = dev;
783
784         /*
785          * With CDC,  the host isn't allowed to use these two data
786          * endpoints in the default altsetting for the interface.
787          * so we don't activate them yet.  Reset from SET_INTERFACE.
788          */
789         if (!cdc_active(dev)) {
790                 result = usb_ep_enable(dev->in_ep, dev->in);
791                 if (result != 0) {
792                         debug("enable %s --> %d\n",
793                                 dev->in_ep->name, result);
794                         goto done;
795                 }
796
797                 result = usb_ep_enable(dev->out_ep, dev->out);
798                 if (result != 0) {
799                         debug("enable %s --> %d\n",
800                                 dev->out_ep->name, result);
801                         goto done;
802                 }
803         }
804
805 done:
806         if (result == 0)
807                 result = alloc_requests(dev, qlen(gadget), gfp_flags);
808
809         /* on error, disable any endpoints  */
810         if (result < 0) {
811                 if (!subset_active(dev) && dev->status_ep)
812                         (void) usb_ep_disable(dev->status_ep);
813                 dev->status = NULL;
814                 (void) usb_ep_disable(dev->in_ep);
815                 (void) usb_ep_disable(dev->out_ep);
816                 dev->in = NULL;
817                 dev->out = NULL;
818         }
819
820         /* caller is responsible for cleanup on error */
821         return result;
822 }
823
824 static void eth_reset_config(struct eth_dev *dev)
825 {
826         if (dev->config == 0)
827                 return;
828
829         debug("%s\n", __func__);
830
831         /*
832          * disable endpoints, forcing (synchronous) completion of
833          * pending i/o.  then free the requests.
834          */
835
836         if (dev->in) {
837                 usb_ep_disable(dev->in_ep);
838                 if (dev->tx_req) {
839                         usb_ep_free_request(dev->in_ep, dev->tx_req);
840                         dev->tx_req = NULL;
841                 }
842         }
843         if (dev->out) {
844                 usb_ep_disable(dev->out_ep);
845                 if (dev->rx_req) {
846                         usb_ep_free_request(dev->out_ep, dev->rx_req);
847                         dev->rx_req = NULL;
848                 }
849         }
850         if (dev->status)
851                 usb_ep_disable(dev->status_ep);
852
853         dev->cdc_filter = 0;
854         dev->config = 0;
855 }
856
857 /*
858  * change our operational config.  must agree with the code
859  * that returns config descriptors, and altsetting code.
860  */
861 static int eth_set_config(struct eth_dev *dev, unsigned number,
862                                 gfp_t gfp_flags)
863 {
864         int                     result = 0;
865         struct usb_gadget       *gadget = dev->gadget;
866
867         if (gadget_is_sa1100(gadget)
868                         && dev->config
869                         && dev->tx_qlen != 0) {
870                 /* tx fifo is full, but we can't clear it...*/
871                 error("can't change configurations");
872                 return -ESPIPE;
873         }
874         eth_reset_config(dev);
875
876         switch (number) {
877         case DEV_CONFIG_VALUE:
878                 result = set_ether_config(dev, gfp_flags);
879                 break;
880         default:
881                 result = -EINVAL;
882                 /* FALL THROUGH */
883         case 0:
884                 break;
885         }
886
887         if (result) {
888                 if (number)
889                         eth_reset_config(dev);
890                 usb_gadget_vbus_draw(dev->gadget,
891                                 gadget_is_otg(dev->gadget) ? 8 : 100);
892         } else {
893                 char *speed;
894                 unsigned power;
895
896                 power = 2 * eth_config.bMaxPower;
897                 usb_gadget_vbus_draw(dev->gadget, power);
898
899                 switch (gadget->speed) {
900                 case USB_SPEED_FULL:
901                         speed = "full"; break;
902 #ifdef CONFIG_USB_GADGET_DUALSPEED
903                 case USB_SPEED_HIGH:
904                         speed = "high"; break;
905 #endif
906                 default:
907                         speed = "?"; break;
908                 }
909
910                 dev->config = number;
911                 printf("%s speed config #%d: %d mA, %s, using %s\n",
912                                 speed, number, power, driver_desc,
913                                 (cdc_active(dev) ? "CDC Ethernet"
914                                                 : "CDC Ethernet Subset"));
915         }
916         return result;
917 }
918
919 /*-------------------------------------------------------------------------*/
920
921 #ifdef  DEV_CONFIG_CDC
922
923 /*
924  * The interrupt endpoint is used in CDC networking models (Ethernet, ATM)
925  * only to notify the host about link status changes (which we support) or
926  * report completion of some encapsulated command.  Since
927  * we want this CDC Ethernet code to be vendor-neutral, we don't use that
928  * command mechanism; and only one status request is ever queued.
929  */
930 static void eth_status_complete(struct usb_ep *ep, struct usb_request *req)
931 {
932         struct usb_cdc_notification     *event = req->buf;
933         int                             value = req->status;
934         struct eth_dev                  *dev = ep->driver_data;
935
936         /* issue the second notification if host reads the first */
937         if (event->bNotificationType == USB_CDC_NOTIFY_NETWORK_CONNECTION
938                         && value == 0) {
939                 __le32  *data = req->buf + sizeof *event;
940
941                 event->bmRequestType = 0xA1;
942                 event->bNotificationType = USB_CDC_NOTIFY_SPEED_CHANGE;
943                 event->wValue = __constant_cpu_to_le16(0);
944                 event->wIndex = __constant_cpu_to_le16(1);
945                 event->wLength = __constant_cpu_to_le16(8);
946
947                 /* SPEED_CHANGE data is up/down speeds in bits/sec */
948                 data[0] = data[1] = cpu_to_le32(BITRATE(dev->gadget));
949
950                 req->length = STATUS_BYTECOUNT;
951                 value = usb_ep_queue(ep, req, GFP_ATOMIC);
952                 debug("send SPEED_CHANGE --> %d\n", value);
953                 if (value == 0)
954                         return;
955         } else if (value != -ECONNRESET) {
956                 debug("event %02x --> %d\n",
957                         event->bNotificationType, value);
958                 if (event->bNotificationType ==
959                                 USB_CDC_NOTIFY_SPEED_CHANGE) {
960                         l_ethdev.network_started = 1;
961                         printf("USB network up!\n");
962                 }
963         }
964         req->context = NULL;
965 }
966
967 static void issue_start_status(struct eth_dev *dev)
968 {
969         struct usb_request              *req = dev->stat_req;
970         struct usb_cdc_notification     *event;
971         int                             value;
972
973         /*
974          * flush old status
975          *
976          * FIXME ugly idiom, maybe we'd be better with just
977          * a "cancel the whole queue" primitive since any
978          * unlink-one primitive has way too many error modes.
979          * here, we "know" toggle is already clear...
980          *
981          * FIXME iff req->context != null just dequeue it
982          */
983         usb_ep_disable(dev->status_ep);
984         usb_ep_enable(dev->status_ep, dev->status);
985
986         /*
987          * 3.8.1 says to issue first NETWORK_CONNECTION, then
988          * a SPEED_CHANGE.  could be useful in some configs.
989          */
990         event = req->buf;
991         event->bmRequestType = 0xA1;
992         event->bNotificationType = USB_CDC_NOTIFY_NETWORK_CONNECTION;
993         event->wValue = __constant_cpu_to_le16(1);      /* connected */
994         event->wIndex = __constant_cpu_to_le16(1);
995         event->wLength = 0;
996
997         req->length = sizeof *event;
998         req->complete = eth_status_complete;
999         req->context = dev;
1000
1001         value = usb_ep_queue(dev->status_ep, req, GFP_ATOMIC);
1002         if (value < 0)
1003                 debug("status buf queue --> %d\n", value);
1004 }
1005
1006 #endif
1007
1008 /*-------------------------------------------------------------------------*/
1009
1010 static void eth_setup_complete(struct usb_ep *ep, struct usb_request *req)
1011 {
1012         if (req->status || req->actual != req->length)
1013                 debug("setup complete --> %d, %d/%d\n",
1014                                 req->status, req->actual, req->length);
1015 }
1016
1017 /*
1018  * The setup() callback implements all the ep0 functionality that's not
1019  * handled lower down.  CDC has a number of less-common features:
1020  *
1021  *  - two interfaces:  control, and ethernet data
1022  *  - Ethernet data interface has two altsettings:  default, and active
1023  *  - class-specific descriptors for the control interface
1024  *  - class-specific control requests
1025  */
1026 static int
1027 eth_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
1028 {
1029         struct eth_dev          *dev = get_gadget_data(gadget);
1030         struct usb_request      *req = dev->req;
1031         int                     value = -EOPNOTSUPP;
1032         u16                     wIndex = le16_to_cpu(ctrl->wIndex);
1033         u16                     wValue = le16_to_cpu(ctrl->wValue);
1034         u16                     wLength = le16_to_cpu(ctrl->wLength);
1035
1036         /*
1037          * descriptors just go into the pre-allocated ep0 buffer,
1038          * while config change events may enable network traffic.
1039          */
1040
1041         debug("%s\n", __func__);
1042
1043         req->complete = eth_setup_complete;
1044         switch (ctrl->bRequest) {
1045
1046         case USB_REQ_GET_DESCRIPTOR:
1047                 if (ctrl->bRequestType != USB_DIR_IN)
1048                         break;
1049                 switch (wValue >> 8) {
1050
1051                 case USB_DT_DEVICE:
1052                         value = min(wLength, (u16) sizeof device_desc);
1053                         memcpy(req->buf, &device_desc, value);
1054                         break;
1055                 case USB_DT_DEVICE_QUALIFIER:
1056                         if (!gadget_is_dualspeed(gadget))
1057                                 break;
1058                         value = min(wLength, (u16) sizeof dev_qualifier);
1059                         memcpy(req->buf, &dev_qualifier, value);
1060                         break;
1061
1062                 case USB_DT_OTHER_SPEED_CONFIG:
1063                         if (!gadget_is_dualspeed(gadget))
1064                                 break;
1065                         /* FALLTHROUGH */
1066                 case USB_DT_CONFIG:
1067                         value = config_buf(gadget, req->buf,
1068                                         wValue >> 8,
1069                                         wValue & 0xff,
1070                                         gadget_is_otg(gadget));
1071                         if (value >= 0)
1072                                 value = min(wLength, (u16) value);
1073                         break;
1074
1075                 case USB_DT_STRING:
1076                         value = usb_gadget_get_string(&stringtab,
1077                                         wValue & 0xff, req->buf);
1078
1079                         if (value >= 0)
1080                                 value = min(wLength, (u16) value);
1081
1082                         break;
1083                 }
1084                 break;
1085
1086         case USB_REQ_SET_CONFIGURATION:
1087                 if (ctrl->bRequestType != 0)
1088                         break;
1089                 if (gadget->a_hnp_support)
1090                         debug("HNP available\n");
1091                 else if (gadget->a_alt_hnp_support)
1092                         debug("HNP needs a different root port\n");
1093                 value = eth_set_config(dev, wValue, GFP_ATOMIC);
1094                 break;
1095         case USB_REQ_GET_CONFIGURATION:
1096                 if (ctrl->bRequestType != USB_DIR_IN)
1097                         break;
1098                 *(u8 *)req->buf = dev->config;
1099                 value = min(wLength, (u16) 1);
1100                 break;
1101
1102         case USB_REQ_SET_INTERFACE:
1103                 if (ctrl->bRequestType != USB_RECIP_INTERFACE
1104                                 || !dev->config
1105                                 || wIndex > 1)
1106                         break;
1107                 if (!cdc_active(dev) && wIndex != 0)
1108                         break;
1109
1110                 /*
1111                  * PXA hardware partially handles SET_INTERFACE;
1112                  * we need to kluge around that interference.
1113                  */
1114                 if (gadget_is_pxa(gadget)) {
1115                         value = eth_set_config(dev, DEV_CONFIG_VALUE,
1116                                                 GFP_ATOMIC);
1117                         goto done_set_intf;
1118                 }
1119
1120 #ifdef DEV_CONFIG_CDC
1121                 switch (wIndex) {
1122                 case 0:         /* control/master intf */
1123                         if (wValue != 0)
1124                                 break;
1125                         if (dev->status) {
1126                                 usb_ep_disable(dev->status_ep);
1127                                 usb_ep_enable(dev->status_ep, dev->status);
1128                         }
1129                         value = 0;
1130                         break;
1131                 case 1:         /* data intf */
1132                         if (wValue > 1)
1133                                 break;
1134                         usb_ep_disable(dev->in_ep);
1135                         usb_ep_disable(dev->out_ep);
1136
1137                         /*
1138                          * CDC requires the data transfers not be done from
1139                          * the default interface setting ... also, setting
1140                          * the non-default interface resets filters etc.
1141                          */
1142                         if (wValue == 1) {
1143                                 if (!cdc_active(dev))
1144                                         break;
1145                                 usb_ep_enable(dev->in_ep, dev->in);
1146                                 usb_ep_enable(dev->out_ep, dev->out);
1147                                 dev->cdc_filter = DEFAULT_FILTER;
1148                                 if (dev->status)
1149                                         issue_start_status(dev);
1150                         }
1151
1152                         value = 0;
1153                         break;
1154                 }
1155 #else
1156                 /*
1157                  * FIXME this is wrong, as is the assumption that
1158                  * all non-PXA hardware talks real CDC ...
1159                  */
1160                 debug("set_interface ignored!\n");
1161 #endif /* DEV_CONFIG_CDC */
1162
1163 done_set_intf:
1164                 break;
1165         case USB_REQ_GET_INTERFACE:
1166                 if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE)
1167                                 || !dev->config
1168                                 || wIndex > 1)
1169                         break;
1170                 if (!(cdc_active(dev)) && wIndex != 0)
1171                         break;
1172
1173                 /* for CDC, iff carrier is on, data interface is active. */
1174                 if (wIndex != 1)
1175                         *(u8 *)req->buf = 0;
1176                 else {
1177                         /* *(u8 *)req->buf = netif_carrier_ok (dev->net) ? 1 : 0; */
1178                         /* carrier always ok ...*/
1179                         *(u8 *)req->buf = 1 ;
1180                 }
1181                 value = min(wLength, (u16) 1);
1182                 break;
1183
1184 #ifdef DEV_CONFIG_CDC
1185         case USB_CDC_SET_ETHERNET_PACKET_FILTER:
1186                 /*
1187                  * see 6.2.30: no data, wIndex = interface,
1188                  * wValue = packet filter bitmap
1189                  */
1190                 if (ctrl->bRequestType != (USB_TYPE_CLASS|USB_RECIP_INTERFACE)
1191                                 || !cdc_active(dev)
1192                                 || wLength != 0
1193                                 || wIndex > 1)
1194                         break;
1195                 debug("packet filter %02x\n", wValue);
1196                 dev->cdc_filter = wValue;
1197                 value = 0;
1198                 break;
1199
1200         /*
1201          * and potentially:
1202          * case USB_CDC_SET_ETHERNET_MULTICAST_FILTERS:
1203          * case USB_CDC_SET_ETHERNET_PM_PATTERN_FILTER:
1204          * case USB_CDC_GET_ETHERNET_PM_PATTERN_FILTER:
1205          * case USB_CDC_GET_ETHERNET_STATISTIC:
1206          */
1207
1208 #endif /* DEV_CONFIG_CDC */
1209
1210         default:
1211                 debug("unknown control req%02x.%02x v%04x i%04x l%d\n",
1212                         ctrl->bRequestType, ctrl->bRequest,
1213                         wValue, wIndex, wLength);
1214         }
1215
1216         /* respond with data transfer before status phase? */
1217         if (value >= 0) {
1218                 debug("respond with data transfer before status phase\n");
1219                 req->length = value;
1220                 req->zero = value < wLength
1221                                 && (value % gadget->ep0->maxpacket) == 0;
1222                 value = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
1223                 if (value < 0) {
1224                         debug("ep_queue --> %d\n", value);
1225                         req->status = 0;
1226                         eth_setup_complete(gadget->ep0, req);
1227                 }
1228         }
1229
1230         /* host either stalls (value < 0) or reports success */
1231         return value;
1232 }
1233
1234 /*-------------------------------------------------------------------------*/
1235
1236 static void rx_complete(struct usb_ep *ep, struct usb_request *req);
1237
1238 static int rx_submit(struct eth_dev *dev, struct usb_request *req,
1239                                 gfp_t gfp_flags)
1240 {
1241         int                     retval = -ENOMEM;
1242         size_t                  size;
1243
1244         /*
1245          * Padding up to RX_EXTRA handles minor disagreements with host.
1246          * Normally we use the USB "terminate on short read" convention;
1247          * so allow up to (N*maxpacket), since that memory is normally
1248          * already allocated.  Some hardware doesn't deal well with short
1249          * reads (e.g. DMA must be N*maxpacket), so for now don't trim a
1250          * byte off the end (to force hardware errors on overflow).
1251          */
1252
1253         debug("%s\n", __func__);
1254
1255         size = (ETHER_HDR_SIZE + dev->mtu + RX_EXTRA);
1256         size += dev->out_ep->maxpacket - 1;
1257         size -= size % dev->out_ep->maxpacket;
1258
1259         /*
1260          * Some platforms perform better when IP packets are aligned,
1261          * but on at least one, checksumming fails otherwise.
1262          */
1263
1264         req->buf = (u8 *) NetRxPackets[0];
1265         req->length = size;
1266         req->complete = rx_complete;
1267
1268         retval = usb_ep_queue(dev->out_ep, req, gfp_flags);
1269
1270         if (retval)
1271                 error("rx submit --> %d", retval);
1272
1273         return retval;
1274 }
1275
1276 static void rx_complete(struct usb_ep *ep, struct usb_request *req)
1277 {
1278         struct eth_dev  *dev = ep->driver_data;
1279
1280         debug("%s: status %d\n", __func__, req->status);
1281         switch (req->status) {
1282         /* normal completion */
1283         case 0:
1284                 dev->stats.rx_packets++;
1285                 dev->stats.rx_bytes += req->length;
1286                 break;
1287
1288         /* software-driven interface shutdown */
1289         case -ECONNRESET:               /* unlink */
1290         case -ESHUTDOWN:                /* disconnect etc */
1291         /* for hardware automagic (such as pxa) */
1292         case -ECONNABORTED:             /* endpoint reset */
1293                 break;
1294
1295         /* data overrun */
1296         case -EOVERFLOW:
1297                 dev->stats.rx_over_errors++;
1298                 /* FALLTHROUGH */
1299         default:
1300                 dev->stats.rx_errors++;
1301                 break;
1302         }
1303
1304         packet_received = 1;
1305 }
1306
1307 static int alloc_requests(struct eth_dev *dev, unsigned n, gfp_t gfp_flags)
1308 {
1309
1310         dev->tx_req = usb_ep_alloc_request(dev->in_ep, 0);
1311
1312         if (!dev->tx_req)
1313                 goto fail1;
1314
1315         dev->rx_req = usb_ep_alloc_request(dev->out_ep, 0);
1316
1317         if (!dev->rx_req)
1318                 goto fail2;
1319
1320         return 0;
1321
1322 fail2:
1323         usb_ep_free_request(dev->in_ep, dev->tx_req);
1324 fail1:
1325         error("can't alloc requests");
1326         return -1;
1327 }
1328
1329 static void tx_complete(struct usb_ep *ep, struct usb_request *req)
1330 {
1331         struct eth_dev  *dev = ep->driver_data;
1332
1333         debug("%s: status %s\n", __func__, (req->status) ? "failed" : "ok");
1334         switch (req->status) {
1335         default:
1336                 dev->stats.tx_errors++;
1337                 debug("tx err %d\n", req->status);
1338                 /* FALLTHROUGH */
1339         case -ECONNRESET:               /* unlink */
1340         case -ESHUTDOWN:                /* disconnect etc */
1341                 break;
1342         case 0:
1343                 dev->stats.tx_bytes += req->length;
1344         }
1345         dev->stats.tx_packets++;
1346
1347         packet_sent = 1;
1348 }
1349
1350 static inline int eth_is_promisc(struct eth_dev *dev)
1351 {
1352         /* no filters for the CDC subset; always promisc */
1353         if (subset_active(dev))
1354                 return 1;
1355         return dev->cdc_filter & USB_CDC_PACKET_TYPE_PROMISCUOUS;
1356 }
1357
1358 #if 0
1359 static int eth_start_xmit (struct sk_buff *skb, struct net_device *net)
1360 {
1361         struct eth_dev          *dev = netdev_priv(net);
1362         int                     length = skb->len;
1363         int                     retval;
1364         struct usb_request      *req = NULL;
1365         unsigned long           flags;
1366
1367         /* apply outgoing CDC or RNDIS filters */
1368         if (!eth_is_promisc (dev)) {
1369                 u8              *dest = skb->data;
1370
1371                 if (is_multicast_ether_addr(dest)) {
1372                         u16     type;
1373
1374                         /* ignores USB_CDC_PACKET_TYPE_MULTICAST and host
1375                          * SET_ETHERNET_MULTICAST_FILTERS requests
1376                          */
1377                         if (is_broadcast_ether_addr(dest))
1378                                 type = USB_CDC_PACKET_TYPE_BROADCAST;
1379                         else
1380                                 type = USB_CDC_PACKET_TYPE_ALL_MULTICAST;
1381                         if (!(dev->cdc_filter & type)) {
1382                                 dev_kfree_skb_any (skb);
1383                                 return 0;
1384                         }
1385                 }
1386                 /* ignores USB_CDC_PACKET_TYPE_DIRECTED */
1387         }
1388
1389         spin_lock_irqsave(&dev->req_lock, flags);
1390         /*
1391          * this freelist can be empty if an interrupt triggered disconnect()
1392          * and reconfigured the gadget (shutting down this queue) after the
1393          * network stack decided to xmit but before we got the spinlock.
1394          */
1395         if (list_empty(&dev->tx_reqs)) {
1396                 spin_unlock_irqrestore(&dev->req_lock, flags);
1397                 return 1;
1398         }
1399
1400         req = container_of (dev->tx_reqs.next, struct usb_request, list);
1401         list_del (&req->list);
1402
1403         /* temporarily stop TX queue when the freelist empties */
1404         if (list_empty (&dev->tx_reqs))
1405                 netif_stop_queue (net);
1406         spin_unlock_irqrestore(&dev->req_lock, flags);
1407
1408         /* no buffer copies needed, unless the network stack did it
1409          * or the hardware can't use skb buffers.
1410          * or there's not enough space for any RNDIS headers we need
1411          */
1412         if (rndis_active(dev)) {
1413                 struct sk_buff  *skb_rndis;
1414
1415                 skb_rndis = skb_realloc_headroom (skb,
1416                                 sizeof (struct rndis_packet_msg_type));
1417                 if (!skb_rndis)
1418                         goto drop;
1419
1420                 dev_kfree_skb_any (skb);
1421                 skb = skb_rndis;
1422                 rndis_add_hdr (skb);
1423                 length = skb->len;
1424         }
1425         req->buf = skb->data;
1426         req->context = skb;
1427         req->complete = tx_complete;
1428
1429         /* use zlp framing on tx for strict CDC-Ether conformance,
1430          * though any robust network rx path ignores extra padding.
1431          * and some hardware doesn't like to write zlps.
1432          */
1433         req->zero = 1;
1434         if (!dev->zlp && (length % dev->in_ep->maxpacket) == 0)
1435                 length++;
1436
1437         req->length = length;
1438
1439         /* throttle highspeed IRQ rate back slightly */
1440         if (gadget_is_dualspeed(dev->gadget))
1441                 req->no_interrupt = (dev->gadget->speed == USB_SPEED_HIGH)
1442                         ? ((atomic_read(&dev->tx_qlen) % qmult) != 0)
1443                         : 0;
1444
1445         retval = usb_ep_queue (dev->in_ep, req, GFP_ATOMIC);
1446         switch (retval) {
1447         default:
1448                 DEBUG (dev, "tx queue err %d\n", retval);
1449                 break;
1450         case 0:
1451                 net->trans_start = jiffies;
1452                 atomic_inc (&dev->tx_qlen);
1453         }
1454
1455         if (retval) {
1456 drop:
1457                 dev->stats.tx_dropped++;
1458                 dev_kfree_skb_any (skb);
1459                 spin_lock_irqsave(&dev->req_lock, flags);
1460                 if (list_empty (&dev->tx_reqs))
1461                         netif_start_queue (net);
1462                 list_add (&req->list, &dev->tx_reqs);
1463                 spin_unlock_irqrestore(&dev->req_lock, flags);
1464         }
1465         return 0;
1466 }
1467
1468 /*-------------------------------------------------------------------------*/
1469 #endif
1470
1471 static void eth_unbind(struct usb_gadget *gadget)
1472 {
1473         struct eth_dev *dev = get_gadget_data(gadget);
1474
1475         debug("%s...\n", __func__);
1476
1477         /* we've already been disconnected ... no i/o is active */
1478         if (dev->req) {
1479                 usb_ep_free_request(gadget->ep0, dev->req);
1480                 dev->req = NULL;
1481         }
1482         if (dev->stat_req) {
1483                 usb_ep_free_request(dev->status_ep, dev->stat_req);
1484                 dev->stat_req = NULL;
1485         }
1486
1487         if (dev->tx_req) {
1488                 usb_ep_free_request(dev->in_ep, dev->tx_req);
1489                 dev->tx_req = NULL;
1490         }
1491
1492         if (dev->rx_req) {
1493                 usb_ep_free_request(dev->out_ep, dev->rx_req);
1494                 dev->rx_req = NULL;
1495         }
1496
1497 /*      unregister_netdev (dev->net);*/
1498 /*      free_netdev(dev->net);*/
1499
1500         dev->gadget = NULL;
1501         set_gadget_data(gadget, NULL);
1502 }
1503
1504 static void eth_disconnect(struct usb_gadget *gadget)
1505 {
1506         eth_reset_config(get_gadget_data(gadget));
1507 }
1508
1509 static void eth_suspend(struct usb_gadget *gadget)
1510 {
1511         /* Not used */
1512 }
1513
1514 static void eth_resume(struct usb_gadget *gadget)
1515 {
1516         /* Not used */
1517 }
1518
1519 /*-------------------------------------------------------------------------*/
1520
1521 static int is_eth_addr_valid(char *str)
1522 {
1523         if (strlen(str) == 17) {
1524                 int i;
1525                 char *p, *q;
1526                 uchar ea[6];
1527
1528                 /* see if it looks like an ethernet address */
1529
1530                 p = str;
1531
1532                 for (i = 0; i < 6; i++) {
1533                         char term = (i == 5 ? '\0' : ':');
1534
1535                         ea[i] = simple_strtol(p, &q, 16);
1536
1537                         if ((q - p) != 2 || *q++ != term)
1538                                 break;
1539
1540                         p = q;
1541                 }
1542
1543                 if (i == 6) /* it looks ok */
1544                         return 1;
1545         }
1546         return 0;
1547 }
1548
1549 static u8 nibble(unsigned char c)
1550 {
1551         if (likely(isdigit(c)))
1552                 return c - '0';
1553         c = toupper(c);
1554         if (likely(isxdigit(c)))
1555                 return 10 + c - 'A';
1556         return 0;
1557 }
1558
1559 static int get_ether_addr(const char *str, u8 *dev_addr)
1560 {
1561         if (str) {
1562                 unsigned        i;
1563
1564                 for (i = 0; i < 6; i++) {
1565                         unsigned char num;
1566
1567                         if ((*str == '.') || (*str == ':'))
1568                                 str++;
1569                         num = nibble(*str++) << 4;
1570                         num |= (nibble(*str++));
1571                         dev_addr[i] = num;
1572                 }
1573                 if (is_valid_ether_addr(dev_addr))
1574                         return 0;
1575         }
1576         return 1;
1577 }
1578
1579 static int eth_bind(struct usb_gadget *gadget)
1580 {
1581         struct eth_dev          *dev = &l_ethdev;
1582         u8                      cdc = 1, zlp = 1;
1583         struct usb_ep           *in_ep, *out_ep, *status_ep = NULL;
1584         int                     gcnum;
1585         u8                      tmp[7];
1586
1587         /* these flags are only ever cleared; compiler take note */
1588 #ifndef DEV_CONFIG_CDC
1589         cdc = 0;
1590 #endif
1591         /*
1592          * Because most host side USB stacks handle CDC Ethernet, that
1593          * standard protocol is _strongly_ preferred for interop purposes.
1594          * (By everyone except Microsoft.)
1595          */
1596         if (gadget_is_pxa(gadget)) {
1597                 /* pxa doesn't support altsettings */
1598                 cdc = 0;
1599         } else if (gadget_is_musbhdrc(gadget)) {
1600                 /* reduce tx dma overhead by avoiding special cases */
1601                 zlp = 0;
1602         } else if (gadget_is_sh(gadget)) {
1603                 /* sh doesn't support multiple interfaces or configs */
1604                 cdc = 0;
1605         } else if (gadget_is_sa1100(gadget)) {
1606                 /* hardware can't write zlps */
1607                 zlp = 0;
1608                 /*
1609                  * sa1100 CAN do CDC, without status endpoint ... we use
1610                  * non-CDC to be compatible with ARM Linux-2.4 "usb-eth".
1611                  */
1612                 cdc = 0;
1613         }
1614
1615         gcnum = usb_gadget_controller_number(gadget);
1616         if (gcnum >= 0)
1617                 device_desc.bcdDevice = cpu_to_le16(0x0300 + gcnum);
1618         else {
1619                 /*
1620                  * can't assume CDC works.  don't want to default to
1621                  * anything less functional on CDC-capable hardware,
1622                  * so we fail in this case.
1623                  */
1624                 error("controller '%s' not recognized",
1625                         gadget->name);
1626                 return -ENODEV;
1627         }
1628
1629         /*
1630          * CDC subset ... recognized by Linux since 2.4.10, but Windows
1631          * drivers aren't widely available.  (That may be improved by
1632          * supporting one submode of the "SAFE" variant of MDLM.)
1633          */
1634         if (!cdc) {
1635                 device_desc.idVendor =
1636                         __constant_cpu_to_le16(SIMPLE_VENDOR_NUM);
1637                 device_desc.idProduct =
1638                         __constant_cpu_to_le16(SIMPLE_PRODUCT_NUM);
1639         }
1640
1641         /* support optional vendor/distro customization */
1642 #if defined(CONFIG_USB_CDC_VENDOR_ID) && defined(CONFIG_USB_CDC_PRODUCT_ID)
1643         device_desc.idVendor = cpu_to_le16(CONFIG_USB_CDC_VENDOR_ID);
1644         device_desc.idProduct = cpu_to_le16(CONFIG_USB_CDC_PRODUCT_ID);
1645 #endif
1646         if (bcdDevice)
1647                 device_desc.bcdDevice = cpu_to_le16(bcdDevice);
1648         if (iManufacturer)
1649                 strlcpy(manufacturer, iManufacturer, sizeof manufacturer);
1650         if (iProduct)
1651                 strlcpy(product_desc, iProduct, sizeof product_desc);
1652         if (iSerialNumber) {
1653                 device_desc.iSerialNumber = STRING_SERIALNUMBER,
1654                 strlcpy(serial_number, iSerialNumber, sizeof serial_number);
1655         }
1656
1657         /* all we really need is bulk IN/OUT */
1658         usb_ep_autoconfig_reset(gadget);
1659         in_ep = usb_ep_autoconfig(gadget, &fs_source_desc);
1660         if (!in_ep) {
1661 autoconf_fail:
1662                 error("can't autoconfigure on %s\n",
1663                         gadget->name);
1664                 return -ENODEV;
1665         }
1666         in_ep->driver_data = in_ep;     /* claim */
1667
1668         out_ep = usb_ep_autoconfig(gadget, &fs_sink_desc);
1669         if (!out_ep)
1670                 goto autoconf_fail;
1671         out_ep->driver_data = out_ep;   /* claim */
1672
1673 #if defined(DEV_CONFIG_CDC)
1674         /*
1675          * CDC Ethernet control interface doesn't require a status endpoint.
1676          * Since some hosts expect one, try to allocate one anyway.
1677          */
1678         if (cdc) {
1679                 status_ep = usb_ep_autoconfig(gadget, &fs_status_desc);
1680                 if (status_ep) {
1681                         status_ep->driver_data = status_ep;     /* claim */
1682                 } else if (cdc) {
1683                         control_intf.bNumEndpoints = 0;
1684                         /* FIXME remove endpoint from descriptor list */
1685                 }
1686         }
1687 #endif
1688
1689         /* one config:  cdc, else minimal subset */
1690         if (!cdc) {
1691                 eth_config.bNumInterfaces = 1;
1692                 eth_config.iConfiguration = STRING_SUBSET;
1693
1694                 /*
1695                  * use functions to set these up, in case we're built to work
1696                  * with multiple controllers and must override CDC Ethernet.
1697                  */
1698                 fs_subset_descriptors();
1699                 hs_subset_descriptors();
1700         }
1701
1702         device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
1703         usb_gadget_set_selfpowered(gadget);
1704
1705         if (gadget_is_dualspeed(gadget)) {
1706                 if (!cdc)
1707                         dev_qualifier.bDeviceClass = USB_CLASS_VENDOR_SPEC;
1708
1709                 /* assumes ep0 uses the same value for both speeds ... */
1710                 dev_qualifier.bMaxPacketSize0 = device_desc.bMaxPacketSize0;
1711
1712                 /* and that all endpoints are dual-speed */
1713                 hs_source_desc.bEndpointAddress =
1714                                 fs_source_desc.bEndpointAddress;
1715                 hs_sink_desc.bEndpointAddress =
1716                                 fs_sink_desc.bEndpointAddress;
1717 #if defined(DEV_CONFIG_CDC)
1718                 if (status_ep)
1719                         hs_status_desc.bEndpointAddress =
1720                                         fs_status_desc.bEndpointAddress;
1721 #endif
1722         }
1723
1724         if (gadget_is_otg(gadget)) {
1725                 otg_descriptor.bmAttributes |= USB_OTG_HNP,
1726                 eth_config.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
1727                 eth_config.bMaxPower = 4;
1728         }
1729
1730         dev->net = &l_netdev;
1731
1732         dev->cdc = cdc;
1733         dev->zlp = zlp;
1734
1735         dev->in_ep = in_ep;
1736         dev->out_ep = out_ep;
1737         dev->status_ep = status_ep;
1738
1739         /*
1740          * Module params for these addresses should come from ID proms.
1741          * The host side address is used with CDC, and commonly
1742          * ends up in a persistent config database.  It's not clear if
1743          * host side code for the SAFE thing cares -- its original BLAN
1744          * thing didn't, Sharp never assigned those addresses on Zaurii.
1745          */
1746         get_ether_addr(dev_addr, dev->net->enetaddr);
1747
1748         memset(tmp, 0, sizeof(tmp));
1749         memcpy(tmp, dev->net->enetaddr, sizeof(dev->net->enetaddr));
1750
1751         get_ether_addr(host_addr, dev->host_mac);
1752
1753         sprintf(ethaddr, "%02X%02X%02X%02X%02X%02X",
1754                 dev->host_mac[0], dev->host_mac[1],
1755                         dev->host_mac[2], dev->host_mac[3],
1756                         dev->host_mac[4], dev->host_mac[5]);
1757
1758         printf("using %s, OUT %s IN %s%s%s\n", gadget->name,
1759                 out_ep->name, in_ep->name,
1760                 status_ep ? " STATUS " : "",
1761                 status_ep ? status_ep->name : ""
1762                 );
1763         printf("MAC %02x:%02x:%02x:%02x:%02x:%02x\n",
1764                 dev->net->enetaddr[0], dev->net->enetaddr[1],
1765                 dev->net->enetaddr[2], dev->net->enetaddr[3],
1766                 dev->net->enetaddr[4], dev->net->enetaddr[5]);
1767
1768         if (cdc) {
1769                 printf("HOST MAC %02x:%02x:%02x:%02x:%02x:%02x\n",
1770                         dev->host_mac[0], dev->host_mac[1],
1771                         dev->host_mac[2], dev->host_mac[3],
1772                         dev->host_mac[4], dev->host_mac[5]);
1773         }
1774
1775         /*
1776          * use PKTSIZE (or aligned... from u-boot) and set
1777          * wMaxSegmentSize accordingly
1778          */
1779         dev->mtu = PKTSIZE_ALIGN; /* RNDIS does not like this, only 1514, TODO*/
1780
1781         /* preallocate control message data and buffer */
1782         dev->req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL);
1783         if (!dev->req)
1784                 goto fail;
1785         dev->req->buf = control_req;
1786         dev->req->complete = eth_setup_complete;
1787
1788         /* ... and maybe likewise for status transfer */
1789 #if defined(DEV_CONFIG_CDC)
1790         if (dev->status_ep) {
1791                 dev->stat_req = usb_ep_alloc_request(dev->status_ep,
1792                                                         GFP_KERNEL);
1793                 if (!dev->stat_req) {
1794                         usb_ep_free_request(dev->status_ep, dev->req);
1795
1796                         goto fail;
1797                 }
1798                 dev->stat_req->buf = status_req;
1799                 dev->stat_req->context = NULL;
1800         }
1801 #endif
1802
1803         /* finish hookup to lower layer ... */
1804         dev->gadget = gadget;
1805         set_gadget_data(gadget, dev);
1806         gadget->ep0->driver_data = dev;
1807
1808         /*
1809          * two kinds of host-initiated state changes:
1810          *  - iff DATA transfer is active, carrier is "on"
1811          *  - tx queueing enabled if open *and* carrier is "on"
1812          */
1813         return 0;
1814
1815 fail:
1816         error("%s failed", __func__);
1817         eth_unbind(gadget);
1818         return -ENOMEM;
1819 }
1820
1821 static int usb_eth_init(struct eth_device *netdev, bd_t *bd)
1822 {
1823         struct eth_dev *dev = &l_ethdev;
1824         struct usb_gadget *gadget;
1825         unsigned long ts;
1826         unsigned long timeout = USB_CONNECT_TIMEOUT;
1827
1828         if (!netdev) {
1829                 error("received NULL ptr");
1830                 goto fail;
1831         }
1832
1833         /* Configure default mac-addresses for the USB ethernet device */
1834 #ifdef CONFIG_USBNET_DEV_ADDR
1835         strlcpy(dev_addr, CONFIG_USBNET_DEV_ADDR, sizeof(dev_addr));
1836 #endif
1837 #ifdef CONFIG_USBNET_HOST_ADDR
1838         strlcpy(host_addr, CONFIG_USBNET_HOST_ADDR, sizeof(host_addr));
1839 #endif
1840         /* Check if the user overruled the MAC addresses */
1841         if (getenv("usbnet_devaddr"))
1842                 strlcpy(dev_addr, getenv("usbnet_devaddr"),
1843                         sizeof(dev_addr));
1844
1845         if (getenv("usbnet_hostaddr"))
1846                 strlcpy(host_addr, getenv("usbnet_hostaddr"),
1847                         sizeof(host_addr));
1848
1849         if (!is_eth_addr_valid(dev_addr)) {
1850                 error("Need valid 'usbnet_devaddr' to be set");
1851                 goto fail;
1852         }
1853         if (!is_eth_addr_valid(host_addr)) {
1854                 error("Need valid 'usbnet_hostaddr' to be set");
1855                 goto fail;
1856         }
1857
1858         if (usb_gadget_register_driver(&eth_driver) < 0)
1859                 goto fail;
1860
1861         dev->network_started = 0;
1862
1863         packet_received = 0;
1864         packet_sent = 0;
1865
1866         gadget = dev->gadget;
1867         usb_gadget_connect(gadget);
1868
1869         if (getenv("cdc_connect_timeout"))
1870                 timeout = simple_strtoul(getenv("cdc_connect_timeout"),
1871                                                 NULL, 10) * CONFIG_SYS_HZ;
1872         ts = get_timer(0);
1873         while (!l_ethdev.network_started) {
1874                 /* Handle control-c and timeouts */
1875                 if (ctrlc() || (get_timer(ts) > timeout)) {
1876                         error("The remote end did not respond in time.");
1877                         goto fail;
1878                 }
1879                 usb_gadget_handle_interrupts();
1880         }
1881
1882         packet_received = 0;
1883         rx_submit(dev, dev->rx_req, 0);
1884         return 0;
1885 fail:
1886         return -1;
1887 }
1888
1889 static int usb_eth_send(struct eth_device *netdev,
1890                         volatile void *packet, int length)
1891 {
1892         int                     retval;
1893         struct eth_dev          *dev = &l_ethdev;
1894         struct usb_request      *req = dev->tx_req;
1895         unsigned long ts;
1896         unsigned long timeout = USB_CONNECT_TIMEOUT;
1897
1898         debug("%s:...\n", __func__);
1899
1900         req->buf = (void *)packet;
1901         req->context = NULL;
1902         req->complete = tx_complete;
1903
1904         /*
1905          * use zlp framing on tx for strict CDC-Ether conformance,
1906          * though any robust network rx path ignores extra padding.
1907          * and some hardware doesn't like to write zlps.
1908          */
1909         req->zero = 1;
1910         if (!dev->zlp && (length % dev->in_ep->maxpacket) == 0)
1911                 length++;
1912
1913         req->length = length;
1914 #if 0
1915         /* throttle highspeed IRQ rate back slightly */
1916         if (gadget_is_dualspeed(dev->gadget))
1917                 req->no_interrupt = (dev->gadget->speed == USB_SPEED_HIGH)
1918                         ? ((dev->tx_qlen % qmult) != 0) : 0;
1919 #endif
1920         dev->tx_qlen = 1;
1921         ts = get_timer(0);
1922         packet_sent = 0;
1923
1924         retval = usb_ep_queue(dev->in_ep, req, GFP_ATOMIC);
1925
1926         if (!retval)
1927                 debug("%s: packet queued\n", __func__);
1928         while (!packet_sent) {
1929                 if (get_timer(ts) > timeout) {
1930                         printf("timeout sending packets to usb ethernet\n");
1931                         return -1;
1932                 }
1933                 usb_gadget_handle_interrupts();
1934         }
1935
1936         return 0;
1937 }
1938
1939 static int usb_eth_recv(struct eth_device *netdev)
1940 {
1941         struct eth_dev *dev = &l_ethdev;
1942
1943         usb_gadget_handle_interrupts();
1944
1945         if (packet_received) {
1946                 debug("%s: packet received\n", __func__);
1947                 if (dev->rx_req) {
1948                         NetReceive(NetRxPackets[0], dev->rx_req->length);
1949                         packet_received = 0;
1950
1951                         rx_submit(dev, dev->rx_req, 0);
1952                 } else
1953                         error("dev->rx_req invalid");
1954         }
1955         return 0;
1956 }
1957
1958 void usb_eth_halt(struct eth_device *netdev)
1959 {
1960         struct eth_dev *dev = &l_ethdev;
1961
1962         if (!netdev) {
1963                 error("received NULL ptr");
1964                 return;
1965         }
1966
1967         /* If the gadget not registered, simple return */
1968         if (!dev->gadget)
1969                 return;
1970
1971         usb_gadget_disconnect(dev->gadget);
1972
1973         /* Clear pending interrupt */
1974         if (dev->network_started) {
1975                 usb_gadget_handle_interrupts();
1976                 dev->network_started = 0;
1977         }
1978
1979         usb_gadget_unregister_driver(&eth_driver);
1980 }
1981
1982 static struct usb_gadget_driver eth_driver = {
1983         .speed          = DEVSPEED,
1984
1985         .bind           = eth_bind,
1986         .unbind         = eth_unbind,
1987
1988         .setup          = eth_setup,
1989         .disconnect     = eth_disconnect,
1990
1991         .suspend        = eth_suspend,
1992         .resume         = eth_resume,
1993 };
1994
1995 int usb_eth_initialize(bd_t *bi)
1996 {
1997         struct eth_device *netdev = &l_netdev;
1998
1999         strlcpy(netdev->name, USB_NET_NAME, sizeof(netdev->name));
2000
2001         netdev->init = usb_eth_init;
2002         netdev->send = usb_eth_send;
2003         netdev->recv = usb_eth_recv;
2004         netdev->halt = usb_eth_halt;
2005
2006 #ifdef CONFIG_MCAST_TFTP
2007   #error not supported
2008 #endif
2009         eth_register(netdev);
2010         return 0;
2011 }