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[PATCH] USB: gadget driver updates (SETUP api change)
[linux-2.6.git] / drivers / usb / gadget / ether.c
blob9f8413e3c10af2e0fbb58abdb08dd71193f4ded1
1 /*
2 * ether.c -- Ethernet gadget driver, with CDC and non-CDC options
3 *
4 * Copyright (C) 2003-2005 David Brownell
5 * Copyright (C) 2003-2004 Robert Schwebel, Benedikt Spranger
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.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22
23 // #define DEBUG 1
24 // #define VERBOSE
25
26 #include <linux/config.h>
27 #include <linux/module.h>
28 #include <linux/kernel.h>
29 #include <linux/delay.h>
30 #include <linux/ioport.h>
31 #include <linux/sched.h>
32 #include <linux/slab.h>
33 #include <linux/smp_lock.h>
34 #include <linux/errno.h>
35 #include <linux/init.h>
36 #include <linux/timer.h>
37 #include <linux/list.h>
38 #include <linux/interrupt.h>
39 #include <linux/utsname.h>
40 #include <linux/device.h>
41 #include <linux/moduleparam.h>
42 #include <linux/ctype.h>
43
44 #include <asm/byteorder.h>
45 #include <asm/io.h>
46 #include <asm/irq.h>
47 #include <asm/system.h>
48 #include <asm/uaccess.h>
49 #include <asm/unaligned.h>
50
51 #include <linux/usb_ch9.h>
52 #include <linux/usb_cdc.h>
53 #include <linux/usb_gadget.h>
54
55 #include <linux/random.h>
56 #include <linux/netdevice.h>
57 #include <linux/etherdevice.h>
58 #include <linux/ethtool.h>
59
60 #include "gadget_chips.h"
61
62 /*-------------------------------------------------------------------------*/
63
64 /*
65 * Ethernet gadget driver -- with CDC and non-CDC options
66 * Builds on hardware support for a full duplex link.
67 *
68 * CDC Ethernet is the standard USB solution for sending Ethernet frames
69 * using USB. Real hardware tends to use the same framing protocol but look
70 * different for control features. This driver strongly prefers to use
71 * this USB-IF standard as its open-systems interoperability solution;
72 * most host side USB stacks (except from Microsoft) support it.
73 *
74 * There's some hardware that can't talk CDC. We make that hardware
75 * implement a "minimalist" vendor-agnostic CDC core: same framing, but
76 * link-level setup only requires activating the configuration.
77 * Linux supports it, but other host operating systems may not.
78 * (This is a subset of CDC Ethernet.)
79 *
80 * A third option is also in use. Rather than CDC Ethernet, or something
81 * simpler, Microsoft pushes their own approach: RNDIS. The published
82 * RNDIS specs are ambiguous and appear to be incomplete, and are also
83 * needlessly complex.
84 */
85
86 #define DRIVER_DESC "Ethernet Gadget"
87 #define DRIVER_VERSION "May Day 2005"
88
89 static const char shortname [] = "ether";
90 static const char driver_desc [] = DRIVER_DESC;
91
92 #define RX_EXTRA 20 /* guard against rx overflows */
93
94 #ifdef CONFIG_USB_ETH_RNDIS
95 #include "rndis.h"
96 #else
97 #define rndis_init() 0
98 #define rndis_uninit(x) do{}while(0)
99 #define rndis_exit() do{}while(0)
100 #endif
101
102 /* CDC and RNDIS support the same host-chosen outgoing packet filters. */
103 #define DEFAULT_FILTER (USB_CDC_PACKET_TYPE_BROADCAST \
104 |USB_CDC_PACKET_TYPE_ALL_MULTICAST \
105 |USB_CDC_PACKET_TYPE_PROMISCUOUS \
106 |USB_CDC_PACKET_TYPE_DIRECTED)
107
108
109 /*-------------------------------------------------------------------------*/
110
111 struct eth_dev {
112 spinlock_t lock;
113 struct usb_gadget *gadget;
114 struct usb_request *req; /* for control responses */
115 struct usb_request *stat_req; /* for cdc & rndis status */
116
117 u8 config;
118 struct usb_ep *in_ep, *out_ep, *status_ep;
119 const struct usb_endpoint_descriptor
120 *in, *out, *status;
121 struct list_head tx_reqs, rx_reqs;
122
123 struct net_device *net;
124 struct net_device_stats stats;
125 atomic_t tx_qlen;
126
127 struct work_struct work;
128 unsigned zlp:1;
129 unsigned cdc:1;
130 unsigned rndis:1;
131 unsigned suspended:1;
132 u16 cdc_filter;
133 unsigned long todo;
134 #define WORK_RX_MEMORY 0
135 int rndis_config;
136 u8 host_mac [ETH_ALEN];
137 };
138
139 /* This version autoconfigures as much as possible at run-time.
140 *
141 * It also ASSUMES a self-powered device, without remote wakeup,
142 * although remote wakeup support would make sense.
143 */
144
145 /*-------------------------------------------------------------------------*/
146
147 /* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
148 * Instead: allocate your own, using normal USB-IF procedures.
149 */
150
151 /* Thanks to NetChip Technologies for donating this product ID.
152 * It's for devices with only CDC Ethernet configurations.
153 */
154 #define CDC_VENDOR_NUM 0x0525 /* NetChip */
155 #define CDC_PRODUCT_NUM 0xa4a1 /* Linux-USB Ethernet Gadget */
156
157 /* For hardware that can't talk CDC, we use the same vendor ID that
158 * ARM Linux has used for ethernet-over-usb, both with sa1100 and
159 * with pxa250. We're protocol-compatible, if the host-side drivers
160 * use the endpoint descriptors. bcdDevice (version) is nonzero, so
161 * drivers that need to hard-wire endpoint numbers have a hook.
162 *
163 * The protocol is a minimal subset of CDC Ether, which works on any bulk
164 * hardware that's not deeply broken ... even on hardware that can't talk
165 * RNDIS (like SA-1100, with no interrupt endpoint, or anything that
166 * doesn't handle control-OUT).
167 */
168 #define SIMPLE_VENDOR_NUM 0x049f
169 #define SIMPLE_PRODUCT_NUM 0x505a
170
171 /* For hardware that can talk RNDIS and either of the above protocols,
172 * use this ID ... the windows INF files will know it. Unless it's
173 * used with CDC Ethernet, Linux 2.4 hosts will need updates to choose
174 * the non-RNDIS configuration.
175 */
176 #define RNDIS_VENDOR_NUM 0x0525 /* NetChip */
177 #define RNDIS_PRODUCT_NUM 0xa4a2 /* Ethernet/RNDIS Gadget */
178
179
180 /* Some systems will want different product identifers published in the
181 * device descriptor, either numbers or strings or both. These string
182 * parameters are in UTF-8 (superset of ASCII's 7 bit characters).
183 */
184
185 static ushort __initdata idVendor;
186 module_param(idVendor, ushort, S_IRUGO);
187 MODULE_PARM_DESC(idVendor, "USB Vendor ID");
188
189 static ushort __initdata idProduct;
190 module_param(idProduct, ushort, S_IRUGO);
191 MODULE_PARM_DESC(idProduct, "USB Product ID");
192
193 static ushort __initdata bcdDevice;
194 module_param(bcdDevice, ushort, S_IRUGO);
195 MODULE_PARM_DESC(bcdDevice, "USB Device version (BCD)");
196
197 static char *__initdata iManufacturer;
198 module_param(iManufacturer, charp, S_IRUGO);
199 MODULE_PARM_DESC(iManufacturer, "USB Manufacturer string");
200
201 static char *__initdata iProduct;
202 module_param(iProduct, charp, S_IRUGO);
203 MODULE_PARM_DESC(iProduct, "USB Product string");
204
205 /* initial value, changed by "ifconfig usb0 hw ether xx:xx:xx:xx:xx:xx" */
206 static char *__initdata dev_addr;
207 module_param(dev_addr, charp, S_IRUGO);
208 MODULE_PARM_DESC(dev_addr, "Device Ethernet Address");
209
210 /* this address is invisible to ifconfig */
211 static char *__initdata host_addr;
212 module_param(host_addr, charp, S_IRUGO);
213 MODULE_PARM_DESC(host_addr, "Host Ethernet Address");
214
215
216 /*-------------------------------------------------------------------------*/
217
218 /* Include CDC support if we could run on CDC-capable hardware. */
219
220 #ifdef CONFIG_USB_GADGET_NET2280
221 #define DEV_CONFIG_CDC
222 #endif
223
224 #ifdef CONFIG_USB_GADGET_DUMMY_HCD
225 #define DEV_CONFIG_CDC
226 #endif
227
228 #ifdef CONFIG_USB_GADGET_GOKU
229 #define DEV_CONFIG_CDC
230 #endif
231
232 #ifdef CONFIG_USB_GADGET_LH7A40X
233 #define DEV_CONFIG_CDC
234 #endif
235
236 #ifdef CONFIG_USB_GADGET_MQ11XX
237 #define DEV_CONFIG_CDC
238 #endif
239
240 #ifdef CONFIG_USB_GADGET_OMAP
241 #define DEV_CONFIG_CDC
242 #endif
243
244 #ifdef CONFIG_USB_GADGET_N9604
245 #define DEV_CONFIG_CDC
246 #endif
247
248 #ifdef CONFIG_USB_GADGET_PXA27X
249 #define DEV_CONFIG_CDC
250 #endif
251
252 #ifdef CONFIG_USB_GADGET_AT91
253 #define DEV_CONFIG_CDC
254 #endif
255
256
257 /* For CDC-incapable hardware, choose the simple cdc subset.
258 * Anything that talks bulk (without notable bugs) can do this.
259 */
260 #ifdef CONFIG_USB_GADGET_PXA2XX
261 #define DEV_CONFIG_SUBSET
262 #endif
263
264 #ifdef CONFIG_USB_GADGET_SH
265 #define DEV_CONFIG_SUBSET
266 #endif
267
268 #ifdef CONFIG_USB_GADGET_SA1100
269 /* use non-CDC for backwards compatibility */
270 #define DEV_CONFIG_SUBSET
271 #endif
272
273 #ifdef CONFIG_USB_GADGET_S3C2410
274 #define DEV_CONFIG_CDC
275 #endif
276
277 /*-------------------------------------------------------------------------*/
278
279 /* "main" config is either CDC, or its simple subset */
280 static inline int is_cdc(struct eth_dev *dev)
281 {
282 #if !defined(DEV_CONFIG_SUBSET)
283 return 1; /* only cdc possible */
284 #elif !defined (DEV_CONFIG_CDC)
285 return 0; /* only subset possible */
286 #else
287 return dev->cdc; /* depends on what hardware we found */
288 #endif
289 }
290
291 /* "secondary" RNDIS config may sometimes be activated */
292 static inline int rndis_active(struct eth_dev *dev)
293 {
294 #ifdef CONFIG_USB_ETH_RNDIS
295 return dev->rndis;
296 #else
297 return 0;
298 #endif
299 }
300
301 #define subset_active(dev) (!is_cdc(dev) && !rndis_active(dev))
302 #define cdc_active(dev) ( is_cdc(dev) && !rndis_active(dev))
303
304
305
306 #define DEFAULT_QLEN 2 /* double buffering by default */
307
308 /* peak bulk transfer bits-per-second */
309 #define HS_BPS (13 * 512 * 8 * 1000 * 8)
310 #define FS_BPS (19 * 64 * 1 * 1000 * 8)
311
312 #ifdef CONFIG_USB_GADGET_DUALSPEED
313 #define DEVSPEED USB_SPEED_HIGH
314
315 static unsigned qmult = 5;
316 module_param (qmult, uint, S_IRUGO|S_IWUSR);
317
318
319 /* for dual-speed hardware, use deeper queues at highspeed */
320 #define qlen(gadget) \
321 (DEFAULT_QLEN*((gadget->speed == USB_SPEED_HIGH) ? qmult : 1))
322
323 /* also defer IRQs on highspeed TX */
324 #define TX_DELAY qmult
325
326 static inline int BITRATE(struct usb_gadget *g)
327 {
328 return (g->speed == USB_SPEED_HIGH) ? HS_BPS : FS_BPS;
329 }
330
331 #else /* full speed (low speed doesn't do bulk) */
332 #define DEVSPEED USB_SPEED_FULL
333
334 #define qlen(gadget) DEFAULT_QLEN
335
336 static inline int BITRATE(struct usb_gadget *g)
337 {
338 return FS_BPS;
339 }
340 #endif
341
342
343 /*-------------------------------------------------------------------------*/
344
345 #define xprintk(d,level,fmt,args...) \
346 printk(level "%s: " fmt , (d)->net->name , ## args)
347
348 #ifdef DEBUG
349 #undef DEBUG
350 #define DEBUG(dev,fmt,args...) \
351 xprintk(dev , KERN_DEBUG , fmt , ## args)
352 #else
353 #define DEBUG(dev,fmt,args...) \
354 do { } while (0)
355 #endif /* DEBUG */
356
357 #ifdef VERBOSE
358 #define VDEBUG DEBUG
359 #else
360 #define VDEBUG(dev,fmt,args...) \
361 do { } while (0)
362 #endif /* DEBUG */
363
364 #define ERROR(dev,fmt,args...) \
365 xprintk(dev , KERN_ERR , fmt , ## args)
366 #define WARN(dev,fmt,args...) \
367 xprintk(dev , KERN_WARNING , fmt , ## args)
368 #define INFO(dev,fmt,args...) \
369 xprintk(dev , KERN_INFO , fmt , ## args)
370
371 /*-------------------------------------------------------------------------*/
372
373 /* USB DRIVER HOOKUP (to the hardware driver, below us), mostly
374 * ep0 implementation: descriptors, config management, setup().
375 * also optional class-specific notification interrupt transfer.
376 */
377
378 /*
379 * DESCRIPTORS ... most are static, but strings and (full) configuration
380 * descriptors are built on demand. For now we do either full CDC, or
381 * our simple subset, with RNDIS as an optional second configuration.
382 *
383 * RNDIS includes some CDC ACM descriptors ... like CDC Ethernet. But
384 * the class descriptors match a modem (they're ignored; it's really just
385 * Ethernet functionality), they don't need the NOP altsetting, and the
386 * status transfer endpoint isn't optional.
387 */
388
389 #define STRING_MANUFACTURER 1
390 #define STRING_PRODUCT 2
391 #define STRING_ETHADDR 3
392 #define STRING_DATA 4
393 #define STRING_CONTROL 5
394 #define STRING_RNDIS_CONTROL 6
395 #define STRING_CDC 7
396 #define STRING_SUBSET 8
397 #define STRING_RNDIS 9
398
399 /* holds our biggest descriptor (or RNDIS response) */
400 #define USB_BUFSIZ 256
401
402 /*
403 * This device advertises one configuration, eth_config, unless RNDIS
404 * is enabled (rndis_config) on hardware supporting at least two configs.
405 *
406 * NOTE: Controllers like superh_udc should probably be able to use
407 * an RNDIS-only configuration.
408 *
409 * FIXME define some higher-powered configurations to make it easier
410 * to recharge batteries ...
411 */
412
413 #define DEV_CONFIG_VALUE 1 /* cdc or subset */
414 #define DEV_RNDIS_CONFIG_VALUE 2 /* rndis; optional */
415
416 static struct usb_device_descriptor
417 device_desc = {
418 .bLength = sizeof device_desc,
419 .bDescriptorType = USB_DT_DEVICE,
420
421 .bcdUSB = __constant_cpu_to_le16 (0x0200),
422
423 .bDeviceClass = USB_CLASS_COMM,
424 .bDeviceSubClass = 0,
425 .bDeviceProtocol = 0,
426
427 .idVendor = __constant_cpu_to_le16 (CDC_VENDOR_NUM),
428 .idProduct = __constant_cpu_to_le16 (CDC_PRODUCT_NUM),
429 .iManufacturer = STRING_MANUFACTURER,
430 .iProduct = STRING_PRODUCT,
431 .bNumConfigurations = 1,
432 };
433
434 static struct usb_otg_descriptor
435 otg_descriptor = {
436 .bLength = sizeof otg_descriptor,
437 .bDescriptorType = USB_DT_OTG,
438
439 .bmAttributes = USB_OTG_SRP,
440 };
441
442 static struct usb_config_descriptor
443 eth_config = {
444 .bLength = sizeof eth_config,
445 .bDescriptorType = USB_DT_CONFIG,
446
447 /* compute wTotalLength on the fly */
448 .bNumInterfaces = 2,
449 .bConfigurationValue = DEV_CONFIG_VALUE,
450 .iConfiguration = STRING_CDC,
451 .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
452 .bMaxPower = 50,
453 };
454
455 #ifdef CONFIG_USB_ETH_RNDIS
456 static struct usb_config_descriptor
457 rndis_config = {
458 .bLength = sizeof rndis_config,
459 .bDescriptorType = USB_DT_CONFIG,
460
461 /* compute wTotalLength on the fly */
462 .bNumInterfaces = 2,
463 .bConfigurationValue = DEV_RNDIS_CONFIG_VALUE,
464 .iConfiguration = STRING_RNDIS,
465 .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
466 .bMaxPower = 50,
467 };
468 #endif
469
470 /*
471 * Compared to the simple CDC subset, the full CDC Ethernet model adds
472 * three class descriptors, two interface descriptors, optional status
473 * endpoint. Both have a "data" interface and two bulk endpoints.
474 * There are also differences in how control requests are handled.
475 *
476 * RNDIS shares a lot with CDC-Ethernet, since it's a variant of
477 * the CDC-ACM (modem) spec.
478 */
479
480 #ifdef DEV_CONFIG_CDC
481 static struct usb_interface_descriptor
482 control_intf = {
483 .bLength = sizeof control_intf,
484 .bDescriptorType = USB_DT_INTERFACE,
485
486 .bInterfaceNumber = 0,
487 /* status endpoint is optional; this may be patched later */
488 .bNumEndpoints = 1,
489 .bInterfaceClass = USB_CLASS_COMM,
490 .bInterfaceSubClass = USB_CDC_SUBCLASS_ETHERNET,
491 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
492 .iInterface = STRING_CONTROL,
493 };
494 #endif
495
496 #ifdef CONFIG_USB_ETH_RNDIS
497 static const struct usb_interface_descriptor
498 rndis_control_intf = {
499 .bLength = sizeof rndis_control_intf,
500 .bDescriptorType = USB_DT_INTERFACE,
501
502 .bInterfaceNumber = 0,
503 .bNumEndpoints = 1,
504 .bInterfaceClass = USB_CLASS_COMM,
505 .bInterfaceSubClass = USB_CDC_SUBCLASS_ACM,
506 .bInterfaceProtocol = USB_CDC_ACM_PROTO_VENDOR,
507 .iInterface = STRING_RNDIS_CONTROL,
508 };
509 #endif
510
511 #if defined(DEV_CONFIG_CDC) || defined(CONFIG_USB_ETH_RNDIS)
512
513 static const struct usb_cdc_header_desc header_desc = {
514 .bLength = sizeof header_desc,
515 .bDescriptorType = USB_DT_CS_INTERFACE,
516 .bDescriptorSubType = USB_CDC_HEADER_TYPE,
517
518 .bcdCDC = __constant_cpu_to_le16 (0x0110),
519 };
520
521 static const struct usb_cdc_union_desc union_desc = {
522 .bLength = sizeof union_desc,
523 .bDescriptorType = USB_DT_CS_INTERFACE,
524 .bDescriptorSubType = USB_CDC_UNION_TYPE,
525
526 .bMasterInterface0 = 0, /* index of control interface */
527 .bSlaveInterface0 = 1, /* index of DATA interface */
528 };
529
530 #endif /* CDC || RNDIS */
531
532 #ifdef CONFIG_USB_ETH_RNDIS
533
534 static const struct usb_cdc_call_mgmt_descriptor call_mgmt_descriptor = {
535 .bLength = sizeof call_mgmt_descriptor,
536 .bDescriptorType = USB_DT_CS_INTERFACE,
537 .bDescriptorSubType = USB_CDC_CALL_MANAGEMENT_TYPE,
538
539 .bmCapabilities = 0x00,
540 .bDataInterface = 0x01,
541 };
542
543 static const struct usb_cdc_acm_descriptor acm_descriptor = {
544 .bLength = sizeof acm_descriptor,
545 .bDescriptorType = USB_DT_CS_INTERFACE,
546 .bDescriptorSubType = USB_CDC_ACM_TYPE,
547
548 .bmCapabilities = 0x00,
549 };
550
551 #endif
552
553 #ifdef DEV_CONFIG_CDC
554
555 static const struct usb_cdc_ether_desc ether_desc = {
556 .bLength = sizeof ether_desc,
557 .bDescriptorType = USB_DT_CS_INTERFACE,
558 .bDescriptorSubType = USB_CDC_ETHERNET_TYPE,
559
560 /* this descriptor actually adds value, surprise! */
561 .iMACAddress = STRING_ETHADDR,
562 .bmEthernetStatistics = __constant_cpu_to_le32 (0), /* no statistics */
563 .wMaxSegmentSize = __constant_cpu_to_le16 (ETH_FRAME_LEN),
564 .wNumberMCFilters = __constant_cpu_to_le16 (0),
565 .bNumberPowerFilters = 0,
566 };
567
568 #endif
569
570 #if defined(DEV_CONFIG_CDC) || defined(CONFIG_USB_ETH_RNDIS)
571
572 /* include the status endpoint if we can, even where it's optional.
573 * use wMaxPacketSize big enough to fit CDC_NOTIFY_SPEED_CHANGE in one
574 * packet, to simplify cancellation; and a big transfer interval, to
575 * waste less bandwidth.
576 *
577 * some drivers (like Linux 2.4 cdc-ether!) "need" it to exist even
578 * if they ignore the connect/disconnect notifications that real aether
579 * can provide. more advanced cdc configurations might want to support
580 * encapsulated commands (vendor-specific, using control-OUT).
581 *
582 * RNDIS requires the status endpoint, since it uses that encapsulation
583 * mechanism for its funky RPC scheme.
584 */
585
586 #define LOG2_STATUS_INTERVAL_MSEC 5 /* 1 << 5 == 32 msec */
587 #define STATUS_BYTECOUNT 16 /* 8 byte header + data */
588
589 static struct usb_endpoint_descriptor
590 fs_status_desc = {
591 .bLength = USB_DT_ENDPOINT_SIZE,
592 .bDescriptorType = USB_DT_ENDPOINT,
593
594 .bEndpointAddress = USB_DIR_IN,
595 .bmAttributes = USB_ENDPOINT_XFER_INT,
596 .wMaxPacketSize = __constant_cpu_to_le16 (STATUS_BYTECOUNT),
597 .bInterval = 1 << LOG2_STATUS_INTERVAL_MSEC,
598 };
599 #endif
600
601 #ifdef DEV_CONFIG_CDC
602
603 /* the default data interface has no endpoints ... */
604
605 static const struct usb_interface_descriptor
606 data_nop_intf = {
607 .bLength = sizeof data_nop_intf,
608 .bDescriptorType = USB_DT_INTERFACE,
609
610 .bInterfaceNumber = 1,
611 .bAlternateSetting = 0,
612 .bNumEndpoints = 0,
613 .bInterfaceClass = USB_CLASS_CDC_DATA,
614 .bInterfaceSubClass = 0,
615 .bInterfaceProtocol = 0,
616 };
617
618 /* ... but the "real" data interface has two bulk endpoints */
619
620 static const struct usb_interface_descriptor
621 data_intf = {
622 .bLength = sizeof data_intf,
623 .bDescriptorType = USB_DT_INTERFACE,
624
625 .bInterfaceNumber = 1,
626 .bAlternateSetting = 1,
627 .bNumEndpoints = 2,
628 .bInterfaceClass = USB_CLASS_CDC_DATA,
629 .bInterfaceSubClass = 0,
630 .bInterfaceProtocol = 0,
631 .iInterface = STRING_DATA,
632 };
633
634 #endif
635
636 #ifdef CONFIG_USB_ETH_RNDIS
637
638 /* RNDIS doesn't activate by changing to the "real" altsetting */
639
640 static const struct usb_interface_descriptor
641 rndis_data_intf = {
642 .bLength = sizeof rndis_data_intf,
643 .bDescriptorType = USB_DT_INTERFACE,
644
645 .bInterfaceNumber = 1,
646 .bAlternateSetting = 0,
647 .bNumEndpoints = 2,
648 .bInterfaceClass = USB_CLASS_CDC_DATA,
649 .bInterfaceSubClass = 0,
650 .bInterfaceProtocol = 0,
651 .iInterface = STRING_DATA,
652 };
653
654 #endif
655
656 #ifdef DEV_CONFIG_SUBSET
657
658 /*
659 * "Simple" CDC-subset option is a simple vendor-neutral model that most
660 * full speed controllers can handle: one interface, two bulk endpoints.
661 */
662
663 static const struct usb_interface_descriptor
664 subset_data_intf = {
665 .bLength = sizeof subset_data_intf,
666 .bDescriptorType = USB_DT_INTERFACE,
667
668 .bInterfaceNumber = 0,
669 .bAlternateSetting = 0,
670 .bNumEndpoints = 2,
671 .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
672 .bInterfaceSubClass = 0,
673 .bInterfaceProtocol = 0,
674 .iInterface = STRING_DATA,
675 };
676
677 #endif /* SUBSET */
678
679
680 static struct usb_endpoint_descriptor
681 fs_source_desc = {
682 .bLength = USB_DT_ENDPOINT_SIZE,
683 .bDescriptorType = USB_DT_ENDPOINT,
684
685 .bEndpointAddress = USB_DIR_IN,
686 .bmAttributes = USB_ENDPOINT_XFER_BULK,
687 };
688
689 static struct usb_endpoint_descriptor
690 fs_sink_desc = {
691 .bLength = USB_DT_ENDPOINT_SIZE,
692 .bDescriptorType = USB_DT_ENDPOINT,
693
694 .bEndpointAddress = USB_DIR_OUT,
695 .bmAttributes = USB_ENDPOINT_XFER_BULK,
696 };
697
698 static const struct usb_descriptor_header *fs_eth_function [11] = {
699 (struct usb_descriptor_header *) &otg_descriptor,
700 #ifdef DEV_CONFIG_CDC
701 /* "cdc" mode descriptors */
702 (struct usb_descriptor_header *) &control_intf,
703 (struct usb_descriptor_header *) &header_desc,
704 (struct usb_descriptor_header *) &union_desc,
705 (struct usb_descriptor_header *) &ether_desc,
706 /* NOTE: status endpoint may need to be removed */
707 (struct usb_descriptor_header *) &fs_status_desc,
708 /* data interface, with altsetting */
709 (struct usb_descriptor_header *) &data_nop_intf,
710 (struct usb_descriptor_header *) &data_intf,
711 (struct usb_descriptor_header *) &fs_source_desc,
712 (struct usb_descriptor_header *) &fs_sink_desc,
713 NULL,
714 #endif /* DEV_CONFIG_CDC */
715 };
716
717 static inline void __init fs_subset_descriptors(void)
718 {
719 #ifdef DEV_CONFIG_SUBSET
720 fs_eth_function[1] = (struct usb_descriptor_header *) &subset_data_intf;
721 fs_eth_function[2] = (struct usb_descriptor_header *) &fs_source_desc;
722 fs_eth_function[3] = (struct usb_descriptor_header *) &fs_sink_desc;
723 fs_eth_function[4] = NULL;
724 #else
725 fs_eth_function[1] = NULL;
726 #endif
727 }
728
729 #ifdef CONFIG_USB_ETH_RNDIS
730 static const struct usb_descriptor_header *fs_rndis_function [] = {
731 (struct usb_descriptor_header *) &otg_descriptor,
732 /* control interface matches ACM, not Ethernet */
733 (struct usb_descriptor_header *) &rndis_control_intf,
734 (struct usb_descriptor_header *) &header_desc,
735 (struct usb_descriptor_header *) &call_mgmt_descriptor,
736 (struct usb_descriptor_header *) &acm_descriptor,
737 (struct usb_descriptor_header *) &union_desc,
738 (struct usb_descriptor_header *) &fs_status_desc,
739 /* data interface has no altsetting */
740 (struct usb_descriptor_header *) &rndis_data_intf,
741 (struct usb_descriptor_header *) &fs_source_desc,
742 (struct usb_descriptor_header *) &fs_sink_desc,
743 NULL,
744 };
745 #endif
746
747 #ifdef CONFIG_USB_GADGET_DUALSPEED
748
749 /*
750 * usb 2.0 devices need to expose both high speed and full speed
751 * descriptors, unless they only run at full speed.
752 */
753
754 #if defined(DEV_CONFIG_CDC) || defined(CONFIG_USB_ETH_RNDIS)
755 static struct usb_endpoint_descriptor
756 hs_status_desc = {
757 .bLength = USB_DT_ENDPOINT_SIZE,
758 .bDescriptorType = USB_DT_ENDPOINT,
759
760 .bmAttributes = USB_ENDPOINT_XFER_INT,
761 .wMaxPacketSize = __constant_cpu_to_le16 (STATUS_BYTECOUNT),
762 .bInterval = LOG2_STATUS_INTERVAL_MSEC + 4,
763 };
764 #endif /* DEV_CONFIG_CDC */
765
766 static struct usb_endpoint_descriptor
767 hs_source_desc = {
768 .bLength = USB_DT_ENDPOINT_SIZE,
769 .bDescriptorType = USB_DT_ENDPOINT,
770
771 .bmAttributes = USB_ENDPOINT_XFER_BULK,
772 .wMaxPacketSize = __constant_cpu_to_le16 (512),
773 };
774
775 static struct usb_endpoint_descriptor
776 hs_sink_desc = {
777 .bLength = USB_DT_ENDPOINT_SIZE,
778 .bDescriptorType = USB_DT_ENDPOINT,
779
780 .bmAttributes = USB_ENDPOINT_XFER_BULK,
781 .wMaxPacketSize = __constant_cpu_to_le16 (512),
782 };
783
784 static struct usb_qualifier_descriptor
785 dev_qualifier = {
786 .bLength = sizeof dev_qualifier,
787 .bDescriptorType = USB_DT_DEVICE_QUALIFIER,
788
789 .bcdUSB = __constant_cpu_to_le16 (0x0200),
790 .bDeviceClass = USB_CLASS_COMM,
791
792 .bNumConfigurations = 1,
793 };
794
795 static const struct usb_descriptor_header *hs_eth_function [11] = {
796 (struct usb_descriptor_header *) &otg_descriptor,
797 #ifdef DEV_CONFIG_CDC
798 /* "cdc" mode descriptors */
799 (struct usb_descriptor_header *) &control_intf,
800 (struct usb_descriptor_header *) &header_desc,
801 (struct usb_descriptor_header *) &union_desc,
802 (struct usb_descriptor_header *) &ether_desc,
803 /* NOTE: status endpoint may need to be removed */
804 (struct usb_descriptor_header *) &hs_status_desc,
805 /* data interface, with altsetting */
806 (struct usb_descriptor_header *) &data_nop_intf,
807 (struct usb_descriptor_header *) &data_intf,
808 (struct usb_descriptor_header *) &hs_source_desc,
809 (struct usb_descriptor_header *) &hs_sink_desc,
810 NULL,
811 #endif /* DEV_CONFIG_CDC */
812 };
813
814 static inline void __init hs_subset_descriptors(void)
815 {
816 #ifdef DEV_CONFIG_SUBSET
817 hs_eth_function[1] = (struct usb_descriptor_header *) &subset_data_intf;
818 hs_eth_function[2] = (struct usb_descriptor_header *) &fs_source_desc;
819 hs_eth_function[3] = (struct usb_descriptor_header *) &fs_sink_desc;
820 hs_eth_function[4] = NULL;
821 #else
822 hs_eth_function[1] = NULL;
823 #endif
824 }
825
826 #ifdef CONFIG_USB_ETH_RNDIS
827 static const struct usb_descriptor_header *hs_rndis_function [] = {
828 (struct usb_descriptor_header *) &otg_descriptor,
829 /* control interface matches ACM, not Ethernet */
830 (struct usb_descriptor_header *) &rndis_control_intf,
831 (struct usb_descriptor_header *) &header_desc,
832 (struct usb_descriptor_header *) &call_mgmt_descriptor,
833 (struct usb_descriptor_header *) &acm_descriptor,
834 (struct usb_descriptor_header *) &union_desc,
835 (struct usb_descriptor_header *) &hs_status_desc,
836 /* data interface has no altsetting */
837 (struct usb_descriptor_header *) &rndis_data_intf,
838 (struct usb_descriptor_header *) &hs_source_desc,
839 (struct usb_descriptor_header *) &hs_sink_desc,
840 NULL,
841 };
842 #endif
843
844
845 /* maxpacket and other transfer characteristics vary by speed. */
846 #define ep_desc(g,hs,fs) (((g)->speed==USB_SPEED_HIGH)?(hs):(fs))
847
848 #else
849
850 /* if there's no high speed support, maxpacket doesn't change. */
851 #define ep_desc(g,hs,fs) (((void)(g)), (fs))
852
853 static inline void __init hs_subset_descriptors(void)
854 {
855 }
856
857 #endif /* !CONFIG_USB_GADGET_DUALSPEED */
858
859 /*-------------------------------------------------------------------------*/
860
861 /* descriptors that are built on-demand */
862
863 static char manufacturer [50];
864 static char product_desc [40] = DRIVER_DESC;
865
866 #ifdef DEV_CONFIG_CDC
867 /* address that the host will use ... usually assigned at random */
868 static char ethaddr [2 * ETH_ALEN + 1];
869 #endif
870
871 /* static strings, in UTF-8 */
872 static struct usb_string strings [] = {
873 { STRING_MANUFACTURER, manufacturer, },
874 { STRING_PRODUCT, product_desc, },
875 { STRING_DATA, "Ethernet Data", },
876 #ifdef DEV_CONFIG_CDC
877 { STRING_CDC, "CDC Ethernet", },
878 { STRING_ETHADDR, ethaddr, },
879 { STRING_CONTROL, "CDC Communications Control", },
880 #endif
881 #ifdef DEV_CONFIG_SUBSET
882 { STRING_SUBSET, "CDC Ethernet Subset", },
883 #endif
884 #ifdef CONFIG_USB_ETH_RNDIS
885 { STRING_RNDIS, "RNDIS", },
886 { STRING_RNDIS_CONTROL, "RNDIS Communications Control", },
887 #endif
888 { } /* end of list */
889 };
890
891 static struct usb_gadget_strings stringtab = {
892 .language = 0x0409, /* en-us */
893 .strings = strings,
894 };
895
896 /*
897 * one config, two interfaces: control, data.
898 * complications: class descriptors, and an altsetting.
899 */
900 static int
901 config_buf (enum usb_device_speed speed,
902 u8 *buf, u8 type,
903 unsigned index, int is_otg)
904 {
905 int len;
906 const struct usb_config_descriptor *config;
907 const struct usb_descriptor_header **function;
908 #ifdef CONFIG_USB_GADGET_DUALSPEED
909 int hs = (speed == USB_SPEED_HIGH);
910
911 if (type == USB_DT_OTHER_SPEED_CONFIG)
912 hs = !hs;
913 #define which_fn(t) (hs ? hs_ ## t ## _function : fs_ ## t ## _function)
914 #else
915 #define which_fn(t) (fs_ ## t ## _function)
916 #endif
917
918 if (index >= device_desc.bNumConfigurations)
919 return -EINVAL;
920
921 #ifdef CONFIG_USB_ETH_RNDIS
922 /* list the RNDIS config first, to make Microsoft's drivers
923 * happy. DOCSIS 1.0 needs this too.
924 */
925 if (device_desc.bNumConfigurations == 2 && index == 0) {
926 config = &rndis_config;
927 function = which_fn (rndis);
928 } else
929 #endif
930 {
931 config = &eth_config;
932 function = which_fn (eth);
933 }
934
935 /* for now, don't advertise srp-only devices */
936 if (!is_otg)
937 function++;
938
939 len = usb_gadget_config_buf (config, buf, USB_BUFSIZ, function);
940 if (len < 0)
941 return len;
942 ((struct usb_config_descriptor *) buf)->bDescriptorType = type;
943 return len;
944 }
945
946 /*-------------------------------------------------------------------------*/
947
948 static void eth_start (struct eth_dev *dev, int gfp_flags);
949 static int alloc_requests (struct eth_dev *dev, unsigned n, int gfp_flags);
950
951 static int
952 set_ether_config (struct eth_dev *dev, int gfp_flags)
953 {
954 int result = 0;
955 struct usb_gadget *gadget = dev->gadget;
956
957 /* status endpoint used for RNDIS and (optionally) CDC */
958 if (!subset_active(dev) && dev->status_ep) {
959 dev->status = ep_desc (gadget, &hs_status_desc,
960 &fs_status_desc);
961 dev->status_ep->driver_data = dev;
962
963 result = usb_ep_enable (dev->status_ep, dev->status);
964 if (result != 0) {
965 DEBUG (dev, "enable %s --> %d\n",
966 dev->status_ep->name, result);
967 goto done;
968 }
969 }
970
971 dev->in = ep_desc (dev->gadget, &hs_source_desc, &fs_source_desc);
972 dev->in_ep->driver_data = dev;
973
974 dev->out = ep_desc (dev->gadget, &hs_sink_desc, &fs_sink_desc);
975 dev->out_ep->driver_data = dev;
976
977 /* With CDC, the host isn't allowed to use these two data
978 * endpoints in the default altsetting for the interface.
979 * so we don't activate them yet. Reset from SET_INTERFACE.
980 *
981 * Strictly speaking RNDIS should work the same: activation is
982 * a side effect of setting a packet filter. Deactivation is
983 * from REMOTE_NDIS_HALT_MSG, reset from REMOTE_NDIS_RESET_MSG.
984 */
985 if (!cdc_active(dev)) {
986 result = usb_ep_enable (dev->in_ep, dev->in);
987 if (result != 0) {
988 DEBUG(dev, "enable %s --> %d\n",
989 dev->in_ep->name, result);
990 goto done;
991 }
992
993 result = usb_ep_enable (dev->out_ep, dev->out);
994 if (result != 0) {
995 DEBUG (dev, "enable %s --> %d\n",
996 dev->in_ep->name, result);
997 goto done;
998 }
999 }
1000
1001 done:
1002 if (result == 0)
1003 result = alloc_requests (dev, qlen (gadget), gfp_flags);
1004
1005 /* on error, disable any endpoints */
1006 if (result < 0) {
1007 if (!subset_active(dev))
1008 (void) usb_ep_disable (dev->status_ep);
1009 dev->status = NULL;
1010 (void) usb_ep_disable (dev->in_ep);
1011 (void) usb_ep_disable (dev->out_ep);
1012 dev->in = NULL;
1013 dev->out = NULL;
1014 } else
1015
1016 /* activate non-CDC configs right away
1017 * this isn't strictly according to the RNDIS spec
1018 */
1019 if (!cdc_active (dev)) {
1020 netif_carrier_on (dev->net);
1021 if (netif_running (dev->net)) {
1022 spin_unlock (&dev->lock);
1023 eth_start (dev, GFP_ATOMIC);
1024 spin_lock (&dev->lock);
1025 }
1026 }
1027
1028 if (result == 0)
1029 DEBUG (dev, "qlen %d\n", qlen (gadget));
1030
1031 /* caller is responsible for cleanup on error */
1032 return result;
1033 }
1034
1035 static void eth_reset_config (struct eth_dev *dev)
1036 {
1037 struct usb_request *req;
1038
1039 if (dev->config == 0)
1040 return;
1041
1042 DEBUG (dev, "%s\n", __FUNCTION__);
1043
1044 netif_stop_queue (dev->net);
1045 netif_carrier_off (dev->net);
1046 rndis_uninit(dev->rndis_config);
1047
1048 /* disable endpoints, forcing (synchronous) completion of
1049 * pending i/o. then free the requests.
1050 */
1051 if (dev->in) {
1052 usb_ep_disable (dev->in_ep);
1053 while (likely (!list_empty (&dev->tx_reqs))) {
1054 req = container_of (dev->tx_reqs.next,
1055 struct usb_request, list);
1056 list_del (&req->list);
1057 usb_ep_free_request (dev->in_ep, req);
1058 }
1059 }
1060 if (dev->out) {
1061 usb_ep_disable (dev->out_ep);
1062 while (likely (!list_empty (&dev->rx_reqs))) {
1063 req = container_of (dev->rx_reqs.next,
1064 struct usb_request, list);
1065 list_del (&req->list);
1066 usb_ep_free_request (dev->out_ep, req);
1067 }
1068 }
1069
1070 if (dev->status) {
1071 usb_ep_disable (dev->status_ep);
1072 }
1073 dev->rndis = 0;
1074 dev->cdc_filter = 0;
1075 dev->config = 0;
1076 }
1077
1078 /* change our operational config. must agree with the code
1079 * that returns config descriptors, and altsetting code.
1080 */
1081 static int
1082 eth_set_config (struct eth_dev *dev, unsigned number, int gfp_flags)
1083 {
1084 int result = 0;
1085 struct usb_gadget *gadget = dev->gadget;
1086
1087 if (gadget_is_sa1100 (gadget)
1088 && dev->config
1089 && atomic_read (&dev->tx_qlen) != 0) {
1090 /* tx fifo is full, but we can't clear it...*/
1091 INFO (dev, "can't change configurations\n");
1092 return -ESPIPE;
1093 }
1094 eth_reset_config (dev);
1095
1096 switch (number) {
1097 case DEV_CONFIG_VALUE:
1098 result = set_ether_config (dev, gfp_flags);
1099 break;
1100 #ifdef CONFIG_USB_ETH_RNDIS
1101 case DEV_RNDIS_CONFIG_VALUE:
1102 dev->rndis = 1;
1103 result = set_ether_config (dev, gfp_flags);
1104 break;
1105 #endif
1106 default:
1107 result = -EINVAL;
1108 /* FALL THROUGH */
1109 case 0:
1110 break;
1111 }
1112
1113 if (result) {
1114 if (number)
1115 eth_reset_config (dev);
1116 usb_gadget_vbus_draw(dev->gadget,
1117 dev->gadget->is_otg ? 8 : 100);
1118 } else {
1119 char *speed;
1120 unsigned power;
1121
1122 power = 2 * eth_config.bMaxPower;
1123 usb_gadget_vbus_draw(dev->gadget, power);
1124
1125 switch (gadget->speed) {
1126 case USB_SPEED_FULL: speed = "full"; break;
1127 #ifdef CONFIG_USB_GADGET_DUALSPEED
1128 case USB_SPEED_HIGH: speed = "high"; break;
1129 #endif
1130 default: speed = "?"; break;
1131 }
1132
1133 dev->config = number;
1134 INFO (dev, "%s speed config #%d: %d mA, %s, using %s\n",
1135 speed, number, power, driver_desc,
1136 dev->rndis
1137 ? "RNDIS"
1138 : (dev->cdc
1139 ? "CDC Ethernet"
1140 : "CDC Ethernet Subset"));
1141 }
1142 return result;
1143 }
1144
1145 /*-------------------------------------------------------------------------*/
1146
1147 #ifdef DEV_CONFIG_CDC
1148
1149 /* The interrupt endpoint is used in CDC networking models (Ethernet, ATM)
1150 * only to notify the host about link status changes (which we support) or
1151 * report completion of some encapsulated command (as used in RNDIS). Since
1152 * we want this CDC Ethernet code to be vendor-neutral, we don't use that
1153 * command mechanism; and only one status request is ever queued.
1154 */
1155
1156 static void eth_status_complete (struct usb_ep *ep, struct usb_request *req)
1157 {
1158 struct usb_cdc_notification *event = req->buf;
1159 int value = req->status;
1160 struct eth_dev *dev = ep->driver_data;
1161
1162 /* issue the second notification if host reads the first */
1163 if (event->bNotificationType == USB_CDC_NOTIFY_NETWORK_CONNECTION
1164 && value == 0) {
1165 __le32 *data = req->buf + sizeof *event;
1166
1167 event->bmRequestType = 0xA1;
1168 event->bNotificationType = USB_CDC_NOTIFY_SPEED_CHANGE;
1169 event->wValue = __constant_cpu_to_le16 (0);
1170 event->wIndex = __constant_cpu_to_le16 (1);
1171 event->wLength = __constant_cpu_to_le16 (8);
1172
1173 /* SPEED_CHANGE data is up/down speeds in bits/sec */
1174 data [0] = data [1] = cpu_to_le32 (BITRATE (dev->gadget));
1175
1176 req->length = STATUS_BYTECOUNT;
1177 value = usb_ep_queue (ep, req, GFP_ATOMIC);
1178 DEBUG (dev, "send SPEED_CHANGE --> %d\n", value);
1179 if (value == 0)
1180 return;
1181 } else if (value != -ECONNRESET)
1182 DEBUG (dev, "event %02x --> %d\n",
1183 event->bNotificationType, value);
1184 req->context = NULL;
1185 }
1186
1187 static void issue_start_status (struct eth_dev *dev)
1188 {
1189 struct usb_request *req = dev->stat_req;
1190 struct usb_cdc_notification *event;
1191 int value;
1192
1193 DEBUG (dev, "%s, flush old status first\n", __FUNCTION__);
1194
1195 /* flush old status
1196 *
1197 * FIXME ugly idiom, maybe we'd be better with just
1198 * a "cancel the whole queue" primitive since any
1199 * unlink-one primitive has way too many error modes.
1200 * here, we "know" toggle is already clear...
1201 *
1202 * FIXME iff req->context != null just dequeue it
1203 */
1204 usb_ep_disable (dev->status_ep);
1205 usb_ep_enable (dev->status_ep, dev->status);
1206
1207 /* 3.8.1 says to issue first NETWORK_CONNECTION, then
1208 * a SPEED_CHANGE. could be useful in some configs.
1209 */
1210 event = req->buf;
1211 event->bmRequestType = 0xA1;
1212 event->bNotificationType = USB_CDC_NOTIFY_NETWORK_CONNECTION;
1213 event->wValue = __constant_cpu_to_le16 (1); /* connected */
1214 event->wIndex = __constant_cpu_to_le16 (1);
1215 event->wLength = 0;
1216
1217 req->length = sizeof *event;
1218 req->complete = eth_status_complete;
1219 req->context = dev;
1220
1221 value = usb_ep_queue (dev->status_ep, req, GFP_ATOMIC);
1222 if (value < 0)
1223 DEBUG (dev, "status buf queue --> %d\n", value);
1224 }
1225
1226 #endif
1227
1228 /*-------------------------------------------------------------------------*/
1229
1230 static void eth_setup_complete (struct usb_ep *ep, struct usb_request *req)
1231 {
1232 if (req->status || req->actual != req->length)
1233 DEBUG ((struct eth_dev *) ep->driver_data,
1234 "setup complete --> %d, %d/%d\n",
1235 req->status, req->actual, req->length);
1236 }
1237
1238 #ifdef CONFIG_USB_ETH_RNDIS
1239
1240 static void rndis_response_complete (struct usb_ep *ep, struct usb_request *req)
1241 {
1242 if (req->status || req->actual != req->length)
1243 DEBUG ((struct eth_dev *) ep->driver_data,
1244 "rndis response complete --> %d, %d/%d\n",
1245 req->status, req->actual, req->length);
1246
1247 /* done sending after USB_CDC_GET_ENCAPSULATED_RESPONSE */
1248 }
1249
1250 static void rndis_command_complete (struct usb_ep *ep, struct usb_request *req)
1251 {
1252 struct eth_dev *dev = ep->driver_data;
1253 int status;
1254
1255 /* received RNDIS command from USB_CDC_SEND_ENCAPSULATED_COMMAND */
1256 spin_lock(&dev->lock);
1257 status = rndis_msg_parser (dev->rndis_config, (u8 *) req->buf);
1258 if (status < 0)
1259 ERROR(dev, "%s: rndis parse error %d\n", __FUNCTION__, status);
1260 spin_unlock(&dev->lock);
1261 }
1262
1263 #endif /* RNDIS */
1264
1265 /*
1266 * The setup() callback implements all the ep0 functionality that's not
1267 * handled lower down. CDC has a number of less-common features:
1268 *
1269 * - two interfaces: control, and ethernet data
1270 * - Ethernet data interface has two altsettings: default, and active
1271 * - class-specific descriptors for the control interface
1272 * - class-specific control requests
1273 */
1274 static int
1275 eth_setup (struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
1276 {
1277 struct eth_dev *dev = get_gadget_data (gadget);
1278 struct usb_request *req = dev->req;
1279 int value = -EOPNOTSUPP;
1280 u16 wIndex = le16_to_cpu(ctrl->wIndex);
1281 u16 wValue = le16_to_cpu(ctrl->wValue);
1282 u16 wLength = le16_to_cpu(ctrl->wLength);
1283
1284 /* descriptors just go into the pre-allocated ep0 buffer,
1285 * while config change events may enable network traffic.
1286 */
1287 req->complete = eth_setup_complete;
1288 switch (ctrl->bRequest) {
1289
1290 case USB_REQ_GET_DESCRIPTOR:
1291 if (ctrl->bRequestType != USB_DIR_IN)
1292 break;
1293 switch (wValue >> 8) {
1294
1295 case USB_DT_DEVICE:
1296 value = min (wLength, (u16) sizeof device_desc);
1297 memcpy (req->buf, &device_desc, value);
1298 break;
1299 #ifdef CONFIG_USB_GADGET_DUALSPEED
1300 case USB_DT_DEVICE_QUALIFIER:
1301 if (!gadget->is_dualspeed)
1302 break;
1303 value = min (wLength, (u16) sizeof dev_qualifier);
1304 memcpy (req->buf, &dev_qualifier, value);
1305 break;
1306
1307 case USB_DT_OTHER_SPEED_CONFIG:
1308 if (!gadget->is_dualspeed)
1309 break;
1310 // FALLTHROUGH
1311 #endif /* CONFIG_USB_GADGET_DUALSPEED */
1312 case USB_DT_CONFIG:
1313 value = config_buf (gadget->speed, req->buf,
1314 wValue >> 8,
1315 wValue & 0xff,
1316 gadget->is_otg);
1317 if (value >= 0)
1318 value = min (wLength, (u16) value);
1319 break;
1320
1321 case USB_DT_STRING:
1322 value = usb_gadget_get_string (&stringtab,
1323 wValue & 0xff, req->buf);
1324 if (value >= 0)
1325 value = min (wLength, (u16) value);
1326 break;
1327 }
1328 break;
1329
1330 case USB_REQ_SET_CONFIGURATION:
1331 if (ctrl->bRequestType != 0)
1332 break;
1333 if (gadget->a_hnp_support)
1334 DEBUG (dev, "HNP available\n");
1335 else if (gadget->a_alt_hnp_support)
1336 DEBUG (dev, "HNP needs a different root port\n");
1337 spin_lock (&dev->lock);
1338 value = eth_set_config (dev, wValue, GFP_ATOMIC);
1339 spin_unlock (&dev->lock);
1340 break;
1341 case USB_REQ_GET_CONFIGURATION:
1342 if (ctrl->bRequestType != USB_DIR_IN)
1343 break;
1344 *(u8 *)req->buf = dev->config;
1345 value = min (wLength, (u16) 1);
1346 break;
1347
1348 case USB_REQ_SET_INTERFACE:
1349 if (ctrl->bRequestType != USB_RECIP_INTERFACE
1350 || !dev->config
1351 || wIndex > 1)
1352 break;
1353 if (!dev->cdc && wIndex != 0)
1354 break;
1355 spin_lock (&dev->lock);
1356
1357 /* PXA hardware partially handles SET_INTERFACE;
1358 * we need to kluge around that interference.
1359 */
1360 if (gadget_is_pxa (gadget)) {
1361 value = eth_set_config (dev, DEV_CONFIG_VALUE,
1362 GFP_ATOMIC);
1363 goto done_set_intf;
1364 }
1365
1366 #ifdef DEV_CONFIG_CDC
1367 switch (wIndex) {
1368 case 0: /* control/master intf */
1369 if (wValue != 0)
1370 break;
1371 if (dev->status) {
1372 usb_ep_disable (dev->status_ep);
1373 usb_ep_enable (dev->status_ep, dev->status);
1374 }
1375 value = 0;
1376 break;
1377 case 1: /* data intf */
1378 if (wValue > 1)
1379 break;
1380 usb_ep_disable (dev->in_ep);
1381 usb_ep_disable (dev->out_ep);
1382
1383 /* CDC requires the data transfers not be done from
1384 * the default interface setting ... also, setting
1385 * the non-default interface resets filters etc.
1386 */
1387 if (wValue == 1) {
1388 if (!cdc_active (dev))
1389 break;
1390 usb_ep_enable (dev->in_ep, dev->in);
1391 usb_ep_enable (dev->out_ep, dev->out);
1392 dev->cdc_filter = DEFAULT_FILTER;
1393 netif_carrier_on (dev->net);
1394 if (dev->status)
1395 issue_start_status (dev);
1396 if (netif_running (dev->net)) {
1397 spin_unlock (&dev->lock);
1398 eth_start (dev, GFP_ATOMIC);
1399 spin_lock (&dev->lock);
1400 }
1401 } else {
1402 netif_stop_queue (dev->net);
1403 netif_carrier_off (dev->net);
1404 }
1405 value = 0;
1406 break;
1407 }
1408 #else
1409 /* FIXME this is wrong, as is the assumption that
1410 * all non-PXA hardware talks real CDC ...
1411 */
1412 dev_warn (&gadget->dev, "set_interface ignored!\n");
1413 #endif /* DEV_CONFIG_CDC */
1414
1415 done_set_intf:
1416 spin_unlock (&dev->lock);
1417 break;
1418 case USB_REQ_GET_INTERFACE:
1419 if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE)
1420 || !dev->config
1421 || wIndex > 1)
1422 break;
1423 if (!(dev->cdc || dev->rndis) && wIndex != 0)
1424 break;
1425
1426 /* for CDC, iff carrier is on, data interface is active. */
1427 if (dev->rndis || wIndex != 1)
1428 *(u8 *)req->buf = 0;
1429 else
1430 *(u8 *)req->buf = netif_carrier_ok (dev->net) ? 1 : 0;
1431 value = min (wLength, (u16) 1);
1432 break;
1433
1434 #ifdef DEV_CONFIG_CDC
1435 case USB_CDC_SET_ETHERNET_PACKET_FILTER:
1436 /* see 6.2.30: no data, wIndex = interface,
1437 * wValue = packet filter bitmap
1438 */
1439 if (ctrl->bRequestType != (USB_TYPE_CLASS|USB_RECIP_INTERFACE)
1440 || !dev->cdc
1441 || dev->rndis
1442 || wLength != 0
1443 || wIndex > 1)
1444 break;
1445 DEBUG (dev, "packet filter %02x\n", wValue);
1446 dev->cdc_filter = wValue;
1447 value = 0;
1448 break;
1449
1450 /* and potentially:
1451 * case USB_CDC_SET_ETHERNET_MULTICAST_FILTERS:
1452 * case USB_CDC_SET_ETHERNET_PM_PATTERN_FILTER:
1453 * case USB_CDC_GET_ETHERNET_PM_PATTERN_FILTER:
1454 * case USB_CDC_GET_ETHERNET_STATISTIC:
1455 */
1456
1457 #endif /* DEV_CONFIG_CDC */
1458
1459 #ifdef CONFIG_USB_ETH_RNDIS
1460 /* RNDIS uses the CDC command encapsulation mechanism to implement
1461 * an RPC scheme, with much getting/setting of attributes by OID.
1462 */
1463 case USB_CDC_SEND_ENCAPSULATED_COMMAND:
1464 if (ctrl->bRequestType != (USB_TYPE_CLASS|USB_RECIP_INTERFACE)
1465 || !dev->rndis
1466 || wLength > USB_BUFSIZ
1467 || wValue
1468 || rndis_control_intf.bInterfaceNumber
1469 != wIndex)
1470 break;
1471 /* read the request, then process it */
1472 value = wLength;
1473 req->complete = rndis_command_complete;
1474 /* later, rndis_control_ack () sends a notification */
1475 break;
1476
1477 case USB_CDC_GET_ENCAPSULATED_RESPONSE:
1478 if ((USB_DIR_IN|USB_TYPE_CLASS|USB_RECIP_INTERFACE)
1479 == ctrl->bRequestType
1480 && dev->rndis
1481 // && wLength >= 0x0400
1482 && !wValue
1483 && rndis_control_intf.bInterfaceNumber
1484 == wIndex) {
1485 u8 *buf;
1486
1487 /* return the result */
1488 buf = rndis_get_next_response (dev->rndis_config,
1489 &value);
1490 if (buf) {
1491 memcpy (req->buf, buf, value);
1492 req->complete = rndis_response_complete;
1493 rndis_free_response(dev->rndis_config, buf);
1494 }
1495 /* else stalls ... spec says to avoid that */
1496 }
1497 break;
1498 #endif /* RNDIS */
1499
1500 default:
1501 VDEBUG (dev,
1502 "unknown control req%02x.%02x v%04x i%04x l%d\n",
1503 ctrl->bRequestType, ctrl->bRequest,
1504 wValue, wIndex, wLength);
1505 }
1506
1507 /* respond with data transfer before status phase? */
1508 if (value >= 0) {
1509 req->length = value;
1510 req->zero = value < wLength
1511 && (value % gadget->ep0->maxpacket) == 0;
1512 value = usb_ep_queue (gadget->ep0, req, GFP_ATOMIC);
1513 if (value < 0) {
1514 DEBUG (dev, "ep_queue --> %d\n", value);
1515 req->status = 0;
1516 eth_setup_complete (gadget->ep0, req);
1517 }
1518 }
1519
1520 /* host either stalls (value < 0) or reports success */
1521 return value;
1522 }
1523
1524 static void
1525 eth_disconnect (struct usb_gadget *gadget)
1526 {
1527 struct eth_dev *dev = get_gadget_data (gadget);
1528 unsigned long flags;
1529
1530 spin_lock_irqsave (&dev->lock, flags);
1531 netif_stop_queue (dev->net);
1532 netif_carrier_off (dev->net);
1533 eth_reset_config (dev);
1534 spin_unlock_irqrestore (&dev->lock, flags);
1535
1536 /* FIXME RNDIS should enter RNDIS_UNINITIALIZED */
1537
1538 /* next we may get setup() calls to enumerate new connections;
1539 * or an unbind() during shutdown (including removing module).
1540 */
1541 }
1542
1543 /*-------------------------------------------------------------------------*/
1544
1545 /* NETWORK DRIVER HOOKUP (to the layer above this driver) */
1546
1547 static int eth_change_mtu (struct net_device *net, int new_mtu)
1548 {
1549 struct eth_dev *dev = netdev_priv(net);
1550
1551 // FIXME if rndis, don't change while link's live
1552
1553 if (new_mtu <= ETH_HLEN || new_mtu > ETH_FRAME_LEN)
1554 return -ERANGE;
1555 /* no zero-length packet read wanted after mtu-sized packets */
1556 if (((new_mtu + sizeof (struct ethhdr)) % dev->in_ep->maxpacket) == 0)
1557 return -EDOM;
1558 net->mtu = new_mtu;
1559 return 0;
1560 }
1561
1562 static struct net_device_stats *eth_get_stats (struct net_device *net)
1563 {
1564 return &((struct eth_dev *)netdev_priv(net))->stats;
1565 }
1566
1567 static void eth_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *p)
1568 {
1569 struct eth_dev *dev = netdev_priv(net);
1570 strlcpy(p->driver, shortname, sizeof p->driver);
1571 strlcpy(p->version, DRIVER_VERSION, sizeof p->version);
1572 strlcpy(p->fw_version, dev->gadget->name, sizeof p->fw_version);
1573 strlcpy (p->bus_info, dev->gadget->dev.bus_id, sizeof p->bus_info);
1574 }
1575
1576 static u32 eth_get_link(struct net_device *net)
1577 {
1578 struct eth_dev *dev = netdev_priv(net);
1579 return dev->gadget->speed != USB_SPEED_UNKNOWN;
1580 }
1581
1582 static struct ethtool_ops ops = {
1583 .get_drvinfo = eth_get_drvinfo,
1584 .get_link = eth_get_link
1585 };
1586
1587 static void defer_kevent (struct eth_dev *dev, int flag)
1588 {
1589 if (test_and_set_bit (flag, &dev->todo))
1590 return;
1591 if (!schedule_work (&dev->work))
1592 ERROR (dev, "kevent %d may have been dropped\n", flag);
1593 else
1594 DEBUG (dev, "kevent %d scheduled\n", flag);
1595 }
1596
1597 static void rx_complete (struct usb_ep *ep, struct usb_request *req);
1598
1599 static int
1600 rx_submit (struct eth_dev *dev, struct usb_request *req, int gfp_flags)
1601 {
1602 struct sk_buff *skb;
1603 int retval = -ENOMEM;
1604 size_t size;
1605
1606 /* Padding up to RX_EXTRA handles minor disagreements with host.
1607 * Normally we use the USB "terminate on short read" convention;
1608 * so allow up to (N*maxpacket), since that memory is normally
1609 * already allocated. Some hardware doesn't deal well with short
1610 * reads (e.g. DMA must be N*maxpacket), so for now don't trim a
1611 * byte off the end (to force hardware errors on overflow).
1612 *
1613 * RNDIS uses internal framing, and explicitly allows senders to
1614 * pad to end-of-packet. That's potentially nice for speed,
1615 * but means receivers can't recover synch on their own.
1616 */
1617 size = (sizeof (struct ethhdr) + dev->net->mtu + RX_EXTRA);
1618 size += dev->out_ep->maxpacket - 1;
1619 if (rndis_active(dev))
1620 size += sizeof (struct rndis_packet_msg_type);
1621 size -= size % dev->out_ep->maxpacket;
1622
1623 if ((skb = alloc_skb (size + NET_IP_ALIGN, gfp_flags)) == 0) {
1624 DEBUG (dev, "no rx skb\n");
1625 goto enomem;
1626 }
1627
1628 /* Some platforms perform better when IP packets are aligned,
1629 * but on at least one, checksumming fails otherwise. Note:
1630 * RNDIS headers involve variable numbers of LE32 values.
1631 */
1632 skb_reserve(skb, NET_IP_ALIGN);
1633
1634 req->buf = skb->data;
1635 req->length = size;
1636 req->complete = rx_complete;
1637 req->context = skb;
1638
1639 retval = usb_ep_queue (dev->out_ep, req, gfp_flags);
1640 if (retval == -ENOMEM)
1641 enomem:
1642 defer_kevent (dev, WORK_RX_MEMORY);
1643 if (retval) {
1644 DEBUG (dev, "rx submit --> %d\n", retval);
1645 dev_kfree_skb_any (skb);
1646 spin_lock (&dev->lock);
1647 list_add (&req->list, &dev->rx_reqs);
1648 spin_unlock (&dev->lock);
1649 }
1650 return retval;
1651 }
1652
1653 static void rx_complete (struct usb_ep *ep, struct usb_request *req)
1654 {
1655 struct sk_buff *skb = req->context;
1656 struct eth_dev *dev = ep->driver_data;
1657 int status = req->status;
1658
1659 switch (status) {
1660
1661 /* normal completion */
1662 case 0:
1663 skb_put (skb, req->actual);
1664 #ifdef CONFIG_USB_ETH_RNDIS
1665 /* we know MaxPacketsPerTransfer == 1 here */
1666 if (dev->rndis)
1667 status = rndis_rm_hdr (skb);
1668 #endif
1669 if (status < 0
1670 || ETH_HLEN > skb->len
1671 || skb->len > ETH_FRAME_LEN) {
1672 dev->stats.rx_errors++;
1673 dev->stats.rx_length_errors++;
1674 DEBUG (dev, "rx length %d\n", skb->len);
1675 break;
1676 }
1677
1678 skb->dev = dev->net;
1679 skb->protocol = eth_type_trans (skb, dev->net);
1680 dev->stats.rx_packets++;
1681 dev->stats.rx_bytes += skb->len;
1682
1683 /* no buffer copies needed, unless hardware can't
1684 * use skb buffers.
1685 */
1686 status = netif_rx (skb);
1687 skb = NULL;
1688 break;
1689
1690 /* software-driven interface shutdown */
1691 case -ECONNRESET: // unlink
1692 case -ESHUTDOWN: // disconnect etc
1693 VDEBUG (dev, "rx shutdown, code %d\n", status);
1694 goto quiesce;
1695
1696 /* for hardware automagic (such as pxa) */
1697 case -ECONNABORTED: // endpoint reset
1698 DEBUG (dev, "rx %s reset\n", ep->name);
1699 defer_kevent (dev, WORK_RX_MEMORY);
1700 quiesce:
1701 dev_kfree_skb_any (skb);
1702 goto clean;
1703
1704 /* data overrun */
1705 case -EOVERFLOW:
1706 dev->stats.rx_over_errors++;
1707 // FALLTHROUGH
1708
1709 default:
1710 dev->stats.rx_errors++;
1711 DEBUG (dev, "rx status %d\n", status);
1712 break;
1713 }
1714
1715 if (skb)
1716 dev_kfree_skb_any (skb);
1717 if (!netif_running (dev->net)) {
1718 clean:
1719 /* nobody reading rx_reqs, so no dev->lock */
1720 list_add (&req->list, &dev->rx_reqs);
1721 req = NULL;
1722 }
1723 if (req)
1724 rx_submit (dev, req, GFP_ATOMIC);
1725 }
1726
1727 static int prealloc (struct list_head *list, struct usb_ep *ep,
1728 unsigned n, int gfp_flags)
1729 {
1730 unsigned i;
1731 struct usb_request *req;
1732
1733 if (!n)
1734 return -ENOMEM;
1735
1736 /* queue/recycle up to N requests */
1737 i = n;
1738 list_for_each_entry (req, list, list) {
1739 if (i-- == 0)
1740 goto extra;
1741 }
1742 while (i--) {
1743 req = usb_ep_alloc_request (ep, gfp_flags);
1744 if (!req)
1745 return list_empty (list) ? -ENOMEM : 0;
1746 list_add (&req->list, list);
1747 }
1748 return 0;
1749
1750 extra:
1751 /* free extras */
1752 for (;;) {
1753 struct list_head *next;
1754
1755 next = req->list.next;
1756 list_del (&req->list);
1757 usb_ep_free_request (ep, req);
1758
1759 if (next == list)
1760 break;
1761
1762 req = container_of (next, struct usb_request, list);
1763 }
1764 return 0;
1765 }
1766
1767 static int alloc_requests (struct eth_dev *dev, unsigned n, int gfp_flags)
1768 {
1769 int status;
1770
1771 status = prealloc (&dev->tx_reqs, dev->in_ep, n, gfp_flags);
1772 if (status < 0)
1773 goto fail;
1774 status = prealloc (&dev->rx_reqs, dev->out_ep, n, gfp_flags);
1775 if (status < 0)
1776 goto fail;
1777 return 0;
1778 fail:
1779 DEBUG (dev, "can't alloc requests\n");
1780 return status;
1781 }
1782
1783 static void rx_fill (struct eth_dev *dev, int gfp_flags)
1784 {
1785 struct usb_request *req;
1786 unsigned long flags;
1787
1788 /* fill unused rxq slots with some skb */
1789 spin_lock_irqsave (&dev->lock, flags);
1790 while (!list_empty (&dev->rx_reqs)) {
1791 req = container_of (dev->rx_reqs.next,
1792 struct usb_request, list);
1793 list_del_init (&req->list);
1794 spin_unlock_irqrestore (&dev->lock, flags);
1795
1796 if (rx_submit (dev, req, gfp_flags) < 0) {
1797 defer_kevent (dev, WORK_RX_MEMORY);
1798 return;
1799 }
1800
1801 spin_lock_irqsave (&dev->lock, flags);
1802 }
1803 spin_unlock_irqrestore (&dev->lock, flags);
1804 }
1805
1806 static void eth_work (void *_dev)
1807 {
1808 struct eth_dev *dev = _dev;
1809
1810 if (test_and_clear_bit (WORK_RX_MEMORY, &dev->todo)) {
1811 if (netif_running (dev->net))
1812 rx_fill (dev, GFP_KERNEL);
1813 }
1814
1815 if (dev->todo)
1816 DEBUG (dev, "work done, flags = 0x%lx\n", dev->todo);
1817 }
1818
1819 static void tx_complete (struct usb_ep *ep, struct usb_request *req)
1820 {
1821 struct sk_buff *skb = req->context;
1822 struct eth_dev *dev = ep->driver_data;
1823
1824 switch (req->status) {
1825 default:
1826 dev->stats.tx_errors++;
1827 VDEBUG (dev, "tx err %d\n", req->status);
1828 /* FALLTHROUGH */
1829 case -ECONNRESET: // unlink
1830 case -ESHUTDOWN: // disconnect etc
1831 break;
1832 case 0:
1833 dev->stats.tx_bytes += skb->len;
1834 }
1835 dev->stats.tx_packets++;
1836
1837 spin_lock (&dev->lock);
1838 list_add (&req->list, &dev->tx_reqs);
1839 spin_unlock (&dev->lock);
1840 dev_kfree_skb_any (skb);
1841
1842 atomic_dec (&dev->tx_qlen);
1843 if (netif_carrier_ok (dev->net))
1844 netif_wake_queue (dev->net);
1845 }
1846
1847 static inline int eth_is_promisc (struct eth_dev *dev)
1848 {
1849 /* no filters for the CDC subset; always promisc */
1850 if (subset_active (dev))
1851 return 1;
1852 return dev->cdc_filter & USB_CDC_PACKET_TYPE_PROMISCUOUS;
1853 }
1854
1855 static int eth_start_xmit (struct sk_buff *skb, struct net_device *net)
1856 {
1857 struct eth_dev *dev = netdev_priv(net);
1858 int length = skb->len;
1859 int retval;
1860 struct usb_request *req = NULL;
1861 unsigned long flags;
1862
1863 /* apply outgoing CDC or RNDIS filters */
1864 if (!eth_is_promisc (dev)) {
1865 u8 *dest = skb->data;
1866
1867 if (dest [0] & 0x01) {
1868 u16 type;
1869
1870 /* ignores USB_CDC_PACKET_TYPE_MULTICAST and host
1871 * SET_ETHERNET_MULTICAST_FILTERS requests
1872 */
1873 if (memcmp (dest, net->broadcast, ETH_ALEN) == 0)
1874 type = USB_CDC_PACKET_TYPE_BROADCAST;
1875 else
1876 type = USB_CDC_PACKET_TYPE_ALL_MULTICAST;
1877 if (!(dev->cdc_filter & type)) {
1878 dev_kfree_skb_any (skb);
1879 return 0;
1880 }
1881 }
1882 /* ignores USB_CDC_PACKET_TYPE_DIRECTED */
1883 }
1884
1885 spin_lock_irqsave (&dev->lock, flags);
1886 req = container_of (dev->tx_reqs.next, struct usb_request, list);
1887 list_del (&req->list);
1888 if (list_empty (&dev->tx_reqs))
1889 netif_stop_queue (net);
1890 spin_unlock_irqrestore (&dev->lock, flags);
1891
1892 /* no buffer copies needed, unless the network stack did it
1893 * or the hardware can't use skb buffers.
1894 * or there's not enough space for any RNDIS headers we need
1895 */
1896 #ifdef CONFIG_USB_ETH_RNDIS
1897 if (dev->rndis) {
1898 struct sk_buff *skb_rndis;
1899
1900 skb_rndis = skb_realloc_headroom (skb,
1901 sizeof (struct rndis_packet_msg_type));
1902 if (!skb_rndis)
1903 goto drop;
1904
1905 dev_kfree_skb_any (skb);
1906 skb = skb_rndis;
1907 rndis_add_hdr (skb);
1908 length = skb->len;
1909 }
1910 #endif
1911 req->buf = skb->data;
1912 req->context = skb;
1913 req->complete = tx_complete;
1914
1915 /* use zlp framing on tx for strict CDC-Ether conformance,
1916 * though any robust network rx path ignores extra padding.
1917 * and some hardware doesn't like to write zlps.
1918 */
1919 req->zero = 1;
1920 if (!dev->zlp && (length % dev->in_ep->maxpacket) == 0)
1921 length++;
1922
1923 req->length = length;
1924
1925 #ifdef CONFIG_USB_GADGET_DUALSPEED
1926 /* throttle highspeed IRQ rate back slightly */
1927 req->no_interrupt = (dev->gadget->speed == USB_SPEED_HIGH)
1928 ? ((atomic_read (&dev->tx_qlen) % TX_DELAY) != 0)
1929 : 0;
1930 #endif
1931
1932 retval = usb_ep_queue (dev->in_ep, req, GFP_ATOMIC);
1933 switch (retval) {
1934 default:
1935 DEBUG (dev, "tx queue err %d\n", retval);
1936 break;
1937 case 0:
1938 net->trans_start = jiffies;
1939 atomic_inc (&dev->tx_qlen);
1940 }
1941
1942 if (retval) {
1943 #ifdef CONFIG_USB_ETH_RNDIS
1944 drop:
1945 #endif
1946 dev->stats.tx_dropped++;
1947 dev_kfree_skb_any (skb);
1948 spin_lock_irqsave (&dev->lock, flags);
1949 if (list_empty (&dev->tx_reqs))
1950 netif_start_queue (net);
1951 list_add (&req->list, &dev->tx_reqs);
1952 spin_unlock_irqrestore (&dev->lock, flags);
1953 }
1954 return 0;
1955 }
1956
1957 /*-------------------------------------------------------------------------*/
1958
1959 #ifdef CONFIG_USB_ETH_RNDIS
1960
1961 /* The interrupt endpoint is used in RNDIS to notify the host when messages
1962 * other than data packets are available ... notably the REMOTE_NDIS_*_CMPLT
1963 * messages, but also REMOTE_NDIS_INDICATE_STATUS_MSG and potentially even
1964 * REMOTE_NDIS_KEEPALIVE_MSG.
1965 *
1966 * The RNDIS control queue is processed by GET_ENCAPSULATED_RESPONSE, and
1967 * normally just one notification will be queued.
1968 */
1969
1970 static struct usb_request *eth_req_alloc (struct usb_ep *, unsigned, unsigned);
1971 static void eth_req_free (struct usb_ep *ep, struct usb_request *req);
1972
1973 static void
1974 rndis_control_ack_complete (struct usb_ep *ep, struct usb_request *req)
1975 {
1976 struct eth_dev *dev = ep->driver_data;
1977
1978 if (req->status || req->actual != req->length)
1979 DEBUG (dev,
1980 "rndis control ack complete --> %d, %d/%d\n",
1981 req->status, req->actual, req->length);
1982 req->context = NULL;
1983
1984 if (req != dev->stat_req)
1985 eth_req_free(ep, req);
1986 }
1987
1988 static int rndis_control_ack (struct net_device *net)
1989 {
1990 struct eth_dev *dev = netdev_priv(net);
1991 u32 length;
1992 struct usb_request *resp = dev->stat_req;
1993
1994 /* in case RNDIS calls this after disconnect */
1995 if (!dev->status) {
1996 DEBUG (dev, "status ENODEV\n");
1997 return -ENODEV;
1998 }
1999
2000 /* in case queue length > 1 */
2001 if (resp->context) {
2002 resp = eth_req_alloc (dev->status_ep, 8, GFP_ATOMIC);
2003 if (!resp)
2004 return -ENOMEM;
2005 }
2006
2007 /* Send RNDIS RESPONSE_AVAILABLE notification;
2008 * USB_CDC_NOTIFY_RESPONSE_AVAILABLE should work too
2009 */
2010 resp->length = 8;
2011 resp->complete = rndis_control_ack_complete;
2012 resp->context = dev;
2013
2014 *((__le32 *) resp->buf) = __constant_cpu_to_le32 (1);
2015 *((__le32 *) resp->buf + 1) = __constant_cpu_to_le32 (0);
2016
2017 length = usb_ep_queue (dev->status_ep, resp, GFP_ATOMIC);
2018 if (length < 0) {
2019 resp->status = 0;
2020 rndis_control_ack_complete (dev->status_ep, resp);
2021 }
2022
2023 return 0;
2024 }
2025
2026 #endif /* RNDIS */
2027
2028 static void eth_start (struct eth_dev *dev, int gfp_flags)
2029 {
2030 DEBUG (dev, "%s\n", __FUNCTION__);
2031
2032 /* fill the rx queue */
2033 rx_fill (dev, gfp_flags);
2034
2035 /* and open the tx floodgates */
2036 atomic_set (&dev->tx_qlen, 0);
2037 netif_wake_queue (dev->net);
2038 #ifdef CONFIG_USB_ETH_RNDIS
2039 if (dev->rndis) {
2040 rndis_set_param_medium (dev->rndis_config,
2041 NDIS_MEDIUM_802_3,
2042 BITRATE(dev->gadget)/100);
2043 (void) rndis_signal_connect (dev->rndis_config);
2044 }
2045 #endif
2046 }
2047
2048 static int eth_open (struct net_device *net)
2049 {
2050 struct eth_dev *dev = netdev_priv(net);
2051
2052 DEBUG (dev, "%s\n", __FUNCTION__);
2053 if (netif_carrier_ok (dev->net))
2054 eth_start (dev, GFP_KERNEL);
2055 return 0;
2056 }
2057
2058 static int eth_stop (struct net_device *net)
2059 {
2060 struct eth_dev *dev = netdev_priv(net);
2061
2062 VDEBUG (dev, "%s\n", __FUNCTION__);
2063 netif_stop_queue (net);
2064
2065 DEBUG (dev, "stop stats: rx/tx %ld/%ld, errs %ld/%ld\n",
2066 dev->stats.rx_packets, dev->stats.tx_packets,
2067 dev->stats.rx_errors, dev->stats.tx_errors
2068 );
2069
2070 /* ensure there are no more active requests */
2071 if (dev->config) {
2072 usb_ep_disable (dev->in_ep);
2073 usb_ep_disable (dev->out_ep);
2074 if (netif_carrier_ok (dev->net)) {
2075 DEBUG (dev, "host still using in/out endpoints\n");
2076 // FIXME idiom may leave toggle wrong here
2077 usb_ep_enable (dev->in_ep, dev->in);
2078 usb_ep_enable (dev->out_ep, dev->out);
2079 }
2080 if (dev->status_ep) {
2081 usb_ep_disable (dev->status_ep);
2082 usb_ep_enable (dev->status_ep, dev->status);
2083 }
2084 }
2085
2086 #ifdef CONFIG_USB_ETH_RNDIS
2087 if (dev->rndis) {
2088 rndis_set_param_medium (dev->rndis_config,
2089 NDIS_MEDIUM_802_3, 0);
2090 (void) rndis_signal_disconnect (dev->rndis_config);
2091 }
2092 #endif
2093
2094 return 0;
2095 }
2096
2097 /*-------------------------------------------------------------------------*/
2098
2099 static struct usb_request *
2100 eth_req_alloc (struct usb_ep *ep, unsigned size, unsigned gfp_flags)
2101 {
2102 struct usb_request *req;
2103
2104 req = usb_ep_alloc_request (ep, gfp_flags);
2105 if (!req)
2106 return NULL;
2107
2108 req->buf = kmalloc (size, gfp_flags);
2109 if (!req->buf) {
2110 usb_ep_free_request (ep, req);
2111 req = NULL;
2112 }
2113 return req;
2114 }
2115
2116 static void
2117 eth_req_free (struct usb_ep *ep, struct usb_request *req)
2118 {
2119 kfree (req->buf);
2120 usb_ep_free_request (ep, req);
2121 }
2122
2123
2124 static void
2125 eth_unbind (struct usb_gadget *gadget)
2126 {
2127 struct eth_dev *dev = get_gadget_data (gadget);
2128
2129 DEBUG (dev, "unbind\n");
2130 #ifdef CONFIG_USB_ETH_RNDIS
2131 rndis_deregister (dev->rndis_config);
2132 rndis_exit ();
2133 #endif
2134
2135 /* we've already been disconnected ... no i/o is active */
2136 if (dev->req) {
2137 eth_req_free (gadget->ep0, dev->req);
2138 dev->req = NULL;
2139 }
2140 if (dev->stat_req) {
2141 eth_req_free (dev->status_ep, dev->stat_req);
2142 dev->stat_req = NULL;
2143 }
2144
2145 unregister_netdev (dev->net);
2146 free_netdev(dev->net);
2147
2148 /* assuming we used keventd, it must quiesce too */
2149 flush_scheduled_work ();
2150 set_gadget_data (gadget, NULL);
2151 }
2152
2153 static u8 __init nibble (unsigned char c)
2154 {
2155 if (likely (isdigit (c)))
2156 return c - '0';
2157 c = toupper (c);
2158 if (likely (isxdigit (c)))
2159 return 10 + c - 'A';
2160 return 0;
2161 }
2162
2163 static void __init get_ether_addr (const char *str, u8 *dev_addr)
2164 {
2165 if (str) {
2166 unsigned i;
2167
2168 for (i = 0; i < 6; i++) {
2169 unsigned char num;
2170
2171 if((*str == '.') || (*str == ':'))
2172 str++;
2173 num = nibble(*str++) << 4;
2174 num |= (nibble(*str++));
2175 dev_addr [i] = num;
2176 }
2177 if (is_valid_ether_addr (dev_addr))
2178 return;
2179 }
2180 random_ether_addr(dev_addr);
2181 }
2182
2183 static int __init
2184 eth_bind (struct usb_gadget *gadget)
2185 {
2186 struct eth_dev *dev;
2187 struct net_device *net;
2188 u8 cdc = 1, zlp = 1, rndis = 1;
2189 struct usb_ep *in_ep, *out_ep, *status_ep = NULL;
2190 int status = -ENOMEM;
2191
2192 /* these flags are only ever cleared; compiler take note */
2193 #ifndef DEV_CONFIG_CDC
2194 cdc = 0;
2195 #endif
2196 #ifndef CONFIG_USB_ETH_RNDIS
2197 rndis = 0;
2198 #endif
2199
2200 /* Because most host side USB stacks handle CDC Ethernet, that
2201 * standard protocol is _strongly_ preferred for interop purposes.
2202 * (By everyone except Microsoft.)
2203 */
2204 if (gadget_is_net2280 (gadget)) {
2205 device_desc.bcdDevice = __constant_cpu_to_le16 (0x0201);
2206 } else if (gadget_is_dummy (gadget)) {
2207 device_desc.bcdDevice = __constant_cpu_to_le16 (0x0202);
2208 } else if (gadget_is_pxa (gadget)) {
2209 device_desc.bcdDevice = __constant_cpu_to_le16 (0x0203);
2210 /* pxa doesn't support altsettings */
2211 cdc = 0;
2212 } else if (gadget_is_sh(gadget)) {
2213 device_desc.bcdDevice = __constant_cpu_to_le16 (0x0204);
2214 /* sh doesn't support multiple interfaces or configs */
2215 cdc = 0;
2216 rndis = 0;
2217 } else if (gadget_is_sa1100 (gadget)) {
2218 device_desc.bcdDevice = __constant_cpu_to_le16 (0x0205);
2219 /* hardware can't write zlps */
2220 zlp = 0;
2221 /* sa1100 CAN do CDC, without status endpoint ... we use
2222 * non-CDC to be compatible with ARM Linux-2.4 "usb-eth".
2223 */
2224 cdc = 0;
2225 } else if (gadget_is_goku (gadget)) {
2226 device_desc.bcdDevice = __constant_cpu_to_le16 (0x0206);
2227 } else if (gadget_is_mq11xx (gadget)) {
2228 device_desc.bcdDevice = __constant_cpu_to_le16 (0x0207);
2229 } else if (gadget_is_omap (gadget)) {
2230 device_desc.bcdDevice = __constant_cpu_to_le16 (0x0208);
2231 } else if (gadget_is_lh7a40x(gadget)) {
2232 device_desc.bcdDevice = __constant_cpu_to_le16 (0x0209);
2233 } else if (gadget_is_n9604(gadget)) {
2234 device_desc.bcdDevice = __constant_cpu_to_le16 (0x0210);
2235 } else if (gadget_is_pxa27x(gadget)) {
2236 device_desc.bcdDevice = __constant_cpu_to_le16 (0x0211);
2237 } else if (gadget_is_s3c2410(gadget)) {
2238 device_desc.bcdDevice = __constant_cpu_to_le16 (0x0212);
2239 } else if (gadget_is_at91(gadget)) {
2240 device_desc.bcdDevice = __constant_cpu_to_le16 (0x0213);
2241 } else {
2242 /* can't assume CDC works. don't want to default to
2243 * anything less functional on CDC-capable hardware,
2244 * so we fail in this case.
2245 */
2246 dev_err (&gadget->dev,
2247 "controller '%s' not recognized\n",
2248 gadget->name);
2249 return -ENODEV;
2250 }
2251 snprintf (manufacturer, sizeof manufacturer, "%s %s/%s",
2252 system_utsname.sysname, system_utsname.release,
2253 gadget->name);
2254
2255 /* If there's an RNDIS configuration, that's what Windows wants to
2256 * be using ... so use these product IDs here and in the "linux.inf"
2257 * needed to install MSFT drivers. Current Linux kernels will use
2258 * the second configuration if it's CDC Ethernet, and need some help
2259 * to choose the right configuration otherwise.
2260 */
2261 if (rndis) {
2262 device_desc.idVendor =
2263 __constant_cpu_to_le16(RNDIS_VENDOR_NUM);
2264 device_desc.idProduct =
2265 __constant_cpu_to_le16(RNDIS_PRODUCT_NUM);
2266 snprintf (product_desc, sizeof product_desc,
2267 "RNDIS/%s", driver_desc);
2268
2269 /* CDC subset ... recognized by Linux since 2.4.10, but Windows
2270 * drivers aren't widely available.
2271 */
2272 } else if (!cdc) {
2273 device_desc.bDeviceClass = USB_CLASS_VENDOR_SPEC;
2274 device_desc.idVendor =
2275 __constant_cpu_to_le16(SIMPLE_VENDOR_NUM);
2276 device_desc.idProduct =
2277 __constant_cpu_to_le16(SIMPLE_PRODUCT_NUM);
2278 }
2279
2280 /* support optional vendor/distro customization */
2281 if (idVendor) {
2282 if (!idProduct) {
2283 dev_err (&gadget->dev, "idVendor needs idProduct!\n");
2284 return -ENODEV;
2285 }
2286 device_desc.idVendor = cpu_to_le16(idVendor);
2287 device_desc.idProduct = cpu_to_le16(idProduct);
2288 if (bcdDevice)
2289 device_desc.bcdDevice = cpu_to_le16(bcdDevice);
2290 }
2291 if (iManufacturer)
2292 strlcpy (manufacturer, iManufacturer, sizeof manufacturer);
2293 if (iProduct)
2294 strlcpy (product_desc, iProduct, sizeof product_desc);
2295
2296 /* all we really need is bulk IN/OUT */
2297 usb_ep_autoconfig_reset (gadget);
2298 in_ep = usb_ep_autoconfig (gadget, &fs_source_desc);
2299 if (!in_ep) {
2300 autoconf_fail:
2301 dev_err (&gadget->dev,
2302 "can't autoconfigure on %s\n",
2303 gadget->name);
2304 return -ENODEV;
2305 }
2306 in_ep->driver_data = in_ep; /* claim */
2307
2308 out_ep = usb_ep_autoconfig (gadget, &fs_sink_desc);
2309 if (!out_ep)
2310 goto autoconf_fail;
2311 out_ep->driver_data = out_ep; /* claim */
2312
2313 #if defined(DEV_CONFIG_CDC) || defined(CONFIG_USB_ETH_RNDIS)
2314 /* CDC Ethernet control interface doesn't require a status endpoint.
2315 * Since some hosts expect one, try to allocate one anyway.
2316 */
2317 if (cdc || rndis) {
2318 status_ep = usb_ep_autoconfig (gadget, &fs_status_desc);
2319 if (status_ep) {
2320 status_ep->driver_data = status_ep; /* claim */
2321 } else if (rndis) {
2322 dev_err (&gadget->dev,
2323 "can't run RNDIS on %s\n",
2324 gadget->name);
2325 return -ENODEV;
2326 #ifdef DEV_CONFIG_CDC
2327 /* pxa25x only does CDC subset; often used with RNDIS */
2328 } else if (cdc) {
2329 control_intf.bNumEndpoints = 0;
2330 /* FIXME remove endpoint from descriptor list */
2331 #endif
2332 }
2333 }
2334 #endif
2335
2336 /* one config: cdc, else minimal subset */
2337 if (!cdc) {
2338 eth_config.bNumInterfaces = 1;
2339 eth_config.iConfiguration = STRING_SUBSET;
2340 fs_subset_descriptors();
2341 hs_subset_descriptors();
2342 }
2343
2344 /* For now RNDIS is always a second config */
2345 if (rndis)
2346 device_desc.bNumConfigurations = 2;
2347
2348 #ifdef CONFIG_USB_GADGET_DUALSPEED
2349 if (rndis)
2350 dev_qualifier.bNumConfigurations = 2;
2351 else if (!cdc)
2352 dev_qualifier.bDeviceClass = USB_CLASS_VENDOR_SPEC;
2353
2354 /* assumes ep0 uses the same value for both speeds ... */
2355 dev_qualifier.bMaxPacketSize0 = device_desc.bMaxPacketSize0;
2356
2357 /* and that all endpoints are dual-speed */
2358 hs_source_desc.bEndpointAddress = fs_source_desc.bEndpointAddress;
2359 hs_sink_desc.bEndpointAddress = fs_sink_desc.bEndpointAddress;
2360 #if defined(DEV_CONFIG_CDC) || defined(CONFIG_USB_ETH_RNDIS)
2361 if (status_ep)
2362 hs_status_desc.bEndpointAddress =
2363 fs_status_desc.bEndpointAddress;
2364 #endif
2365 #endif /* DUALSPEED */
2366
2367 device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
2368 usb_gadget_set_selfpowered (gadget);
2369
2370 if (gadget->is_otg) {
2371 otg_descriptor.bmAttributes |= USB_OTG_HNP,
2372 eth_config.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
2373 eth_config.bMaxPower = 4;
2374 #ifdef CONFIG_USB_ETH_RNDIS
2375 rndis_config.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
2376 rndis_config.bMaxPower = 4;
2377 #endif
2378 }
2379
2380 net = alloc_etherdev (sizeof *dev);
2381 if (!net)
2382 return status;
2383 dev = netdev_priv(net);
2384 spin_lock_init (&dev->lock);
2385 INIT_WORK (&dev->work, eth_work, dev);
2386 INIT_LIST_HEAD (&dev->tx_reqs);
2387 INIT_LIST_HEAD (&dev->rx_reqs);
2388
2389 /* network device setup */
2390 dev->net = net;
2391 SET_MODULE_OWNER (net);
2392 strcpy (net->name, "usb%d");
2393 dev->cdc = cdc;
2394 dev->zlp = zlp;
2395
2396 dev->in_ep = in_ep;
2397 dev->out_ep = out_ep;
2398 dev->status_ep = status_ep;
2399
2400 /* Module params for these addresses should come from ID proms.
2401 * The host side address is used with CDC and RNDIS, and commonly
2402 * ends up in a persistent config database.
2403 */
2404 get_ether_addr(dev_addr, net->dev_addr);
2405 if (cdc || rndis) {
2406 get_ether_addr(host_addr, dev->host_mac);
2407 #ifdef DEV_CONFIG_CDC
2408 snprintf (ethaddr, sizeof ethaddr, "%02X%02X%02X%02X%02X%02X",
2409 dev->host_mac [0], dev->host_mac [1],
2410 dev->host_mac [2], dev->host_mac [3],
2411 dev->host_mac [4], dev->host_mac [5]);
2412 #endif
2413 }
2414
2415 if (rndis) {
2416 status = rndis_init();
2417 if (status < 0) {
2418 dev_err (&gadget->dev, "can't init RNDIS, %d\n",
2419 status);
2420 goto fail;
2421 }
2422 }
2423
2424 net->change_mtu = eth_change_mtu;
2425 net->get_stats = eth_get_stats;
2426 net->hard_start_xmit = eth_start_xmit;
2427 net->open = eth_open;
2428 net->stop = eth_stop;
2429 // watchdog_timeo, tx_timeout ...
2430 // set_multicast_list
2431 SET_ETHTOOL_OPS(net, &ops);
2432
2433 /* preallocate control message data and buffer */
2434 dev->req = eth_req_alloc (gadget->ep0, USB_BUFSIZ, GFP_KERNEL);
2435 if (!dev->req)
2436 goto fail;
2437 dev->req->complete = eth_setup_complete;
2438
2439 /* ... and maybe likewise for status transfer */
2440 if (dev->status_ep) {
2441 dev->stat_req = eth_req_alloc (dev->status_ep,
2442 STATUS_BYTECOUNT, GFP_KERNEL);
2443 if (!dev->stat_req) {
2444 eth_req_free (gadget->ep0, dev->req);
2445 goto fail;
2446 }
2447 dev->stat_req->context = NULL;
2448 }
2449
2450 /* finish hookup to lower layer ... */
2451 dev->gadget = gadget;
2452 set_gadget_data (gadget, dev);
2453 gadget->ep0->driver_data = dev;
2454
2455 /* two kinds of host-initiated state changes:
2456 * - iff DATA transfer is active, carrier is "on"
2457 * - tx queueing enabled if open *and* carrier is "on"
2458 */
2459 netif_stop_queue (dev->net);
2460 netif_carrier_off (dev->net);
2461
2462 SET_NETDEV_DEV (dev->net, &gadget->dev);
2463 status = register_netdev (dev->net);
2464 if (status < 0)
2465 goto fail1;
2466
2467 INFO (dev, "%s, version: " DRIVER_VERSION "\n", driver_desc);
2468 INFO (dev, "using %s, OUT %s IN %s%s%s\n", gadget->name,
2469 out_ep->name, in_ep->name,
2470 status_ep ? " STATUS " : "",
2471 status_ep ? status_ep->name : ""
2472 );
2473 INFO (dev, "MAC %02x:%02x:%02x:%02x:%02x:%02x\n",
2474 net->dev_addr [0], net->dev_addr [1],
2475 net->dev_addr [2], net->dev_addr [3],
2476 net->dev_addr [4], net->dev_addr [5]);
2477
2478 if (cdc || rndis)
2479 INFO (dev, "HOST MAC %02x:%02x:%02x:%02x:%02x:%02x\n",
2480 dev->host_mac [0], dev->host_mac [1],
2481 dev->host_mac [2], dev->host_mac [3],
2482 dev->host_mac [4], dev->host_mac [5]);
2483
2484 #ifdef CONFIG_USB_ETH_RNDIS
2485 if (rndis) {
2486 u32 vendorID = 0;
2487
2488 /* FIXME RNDIS vendor id == "vendor NIC code" == ? */
2489
2490 dev->rndis_config = rndis_register (rndis_control_ack);
2491 if (dev->rndis_config < 0) {
2492 fail0:
2493 unregister_netdev (dev->net);
2494 status = -ENODEV;
2495 goto fail;
2496 }
2497
2498 /* these set up a lot of the OIDs that RNDIS needs */
2499 rndis_set_host_mac (dev->rndis_config, dev->host_mac);
2500 if (rndis_set_param_dev (dev->rndis_config, dev->net,
2501 &dev->stats, &dev->cdc_filter))
2502 goto fail0;
2503 if (rndis_set_param_vendor (dev->rndis_config, vendorID,
2504 manufacturer))
2505 goto fail0;
2506 if (rndis_set_param_medium (dev->rndis_config,
2507 NDIS_MEDIUM_802_3,
2508 0))
2509 goto fail0;
2510 INFO (dev, "RNDIS ready\n");
2511 }
2512 #endif
2513
2514 return status;
2515
2516 fail1:
2517 dev_dbg(&gadget->dev, "register_netdev failed, %d\n", status);
2518 fail:
2519 eth_unbind (gadget);
2520 return status;
2521 }
2522
2523 /*-------------------------------------------------------------------------*/
2524
2525 static void
2526 eth_suspend (struct usb_gadget *gadget)
2527 {
2528 struct eth_dev *dev = get_gadget_data (gadget);
2529
2530 DEBUG (dev, "suspend\n");
2531 dev->suspended = 1;
2532 }
2533
2534 static void
2535 eth_resume (struct usb_gadget *gadget)
2536 {
2537 struct eth_dev *dev = get_gadget_data (gadget);
2538
2539 DEBUG (dev, "resume\n");
2540 dev->suspended = 0;
2541 }
2542
2543 /*-------------------------------------------------------------------------*/
2544
2545 static struct usb_gadget_driver eth_driver = {
2546 .speed = DEVSPEED,
2547
2548 .function = (char *) driver_desc,
2549 .bind = eth_bind,
2550 .unbind = eth_unbind,
2551
2552 .setup = eth_setup,
2553 .disconnect = eth_disconnect,
2554
2555 .suspend = eth_suspend,
2556 .resume = eth_resume,
2557
2558 .driver = {
2559 .name = (char *) shortname,
2560 // .shutdown = ...
2561 // .suspend = ...
2562 // .resume = ...
2563 },
2564 };
2565
2566 MODULE_DESCRIPTION (DRIVER_DESC);
2567 MODULE_AUTHOR ("David Brownell, Benedikt Spanger");
2568 MODULE_LICENSE ("GPL");
2569
2570
2571 static int __init init (void)
2572 {
2573 return usb_gadget_register_driver (&eth_driver);
2574 }
2575 module_init (init);
2576
2577 static void __exit cleanup (void)
2578 {
2579 usb_gadget_unregister_driver (&eth_driver);
2580 }
2581 module_exit (cleanup);
2582
Linus' kernel tree