2
* dbgp.c -- EHCI Debug Port device gadget
4
* Copyright (C) 2010 Stephane Duverger
6
* Released under the GPLv2.
10
#include <linux/kernel.h>
11
#include <linux/device.h>
12
#include <linux/module.h>
13
#include <linux/usb/ch9.h>
14
#include <linux/usb/gadget.h>
16
/* See comments in "zero.c" */
17
#include "epautoconf.c"
19
#ifdef CONFIG_USB_G_DBGP_SERIAL
23
#define DRIVER_VENDOR_ID 0x0525 /* NetChip */
24
#define DRIVER_PRODUCT_ID 0xc0de /* undefined */
26
#define USB_DEBUG_MAX_PACKET_SIZE 8
27
#define DBGP_REQ_EP0_LEN 128
28
#define DBGP_REQ_LEN 512
31
struct usb_gadget *gadget;
32
struct usb_request *req;
35
#ifdef CONFIG_USB_G_DBGP_SERIAL
36
struct gserial *serial;
40
static struct usb_device_descriptor device_desc = {
41
.bLength = sizeof device_desc,
42
.bDescriptorType = USB_DT_DEVICE,
43
.bcdUSB = __constant_cpu_to_le16(0x0200),
44
.bDeviceClass = USB_CLASS_VENDOR_SPEC,
45
.idVendor = __constant_cpu_to_le16(DRIVER_VENDOR_ID),
46
.idProduct = __constant_cpu_to_le16(DRIVER_PRODUCT_ID),
47
.bNumConfigurations = 1,
50
static struct usb_debug_descriptor dbg_desc = {
51
.bLength = sizeof dbg_desc,
52
.bDescriptorType = USB_DT_DEBUG,
55
static struct usb_endpoint_descriptor i_desc = {
56
.bLength = USB_DT_ENDPOINT_SIZE,
57
.bDescriptorType = USB_DT_ENDPOINT,
58
.bmAttributes = USB_ENDPOINT_XFER_BULK,
59
.bEndpointAddress = USB_DIR_IN,
62
static struct usb_endpoint_descriptor o_desc = {
63
.bLength = USB_DT_ENDPOINT_SIZE,
64
.bDescriptorType = USB_DT_ENDPOINT,
65
.bmAttributes = USB_ENDPOINT_XFER_BULK,
66
.bEndpointAddress = USB_DIR_OUT,
69
#ifdef CONFIG_USB_G_DBGP_PRINTK
70
static int dbgp_consume(char *buf, unsigned len)
81
printk(KERN_NOTICE "%s%c", buf, c);
85
static void __disable_ep(struct usb_ep *ep)
87
if (ep && ep->driver_data == dbgp.gadget) {
89
ep->driver_data = NULL;
93
static void dbgp_disable_ep(void)
95
__disable_ep(dbgp.i_ep);
96
__disable_ep(dbgp.o_ep);
99
static void dbgp_complete(struct usb_ep *ep, struct usb_request *req)
103
int status = req->status;
105
if (ep == dbgp.i_ep) {
115
dbgp_consume(req->buf, req->actual);
117
req->length = DBGP_REQ_LEN;
118
err = usb_ep_queue(ep, req, GFP_ATOMIC);
128
usb_ep_free_request(dbgp.o_ep, req);
131
dev_dbg(&dbgp.gadget->dev,
132
"complete: failure (%d:%d) ==> %d\n", stp, err, status);
135
static int dbgp_enable_ep_req(struct usb_ep *ep)
138
struct usb_request *req;
140
req = usb_ep_alloc_request(ep, GFP_KERNEL);
147
req->buf = kmalloc(DBGP_REQ_LEN, GFP_KERNEL);
154
req->complete = dbgp_complete;
155
req->length = DBGP_REQ_LEN;
156
err = usb_ep_queue(ep, req, GFP_ATOMIC);
167
usb_ep_free_request(dbgp.o_ep, req);
169
dev_dbg(&dbgp.gadget->dev,
170
"enable ep req: failure (%d:%d)\n", stp, err);
174
static int __enable_ep(struct usb_ep *ep, struct usb_endpoint_descriptor *desc)
178
err = usb_ep_enable(ep);
179
ep->driver_data = dbgp.gadget;
183
static int dbgp_enable_ep(void)
187
err = __enable_ep(dbgp.i_ep, &i_desc);
193
err = __enable_ep(dbgp.o_ep, &o_desc);
199
err = dbgp_enable_ep_req(dbgp.o_ep);
208
__disable_ep(dbgp.o_ep);
210
__disable_ep(dbgp.i_ep);
212
dev_dbg(&dbgp.gadget->dev, "enable ep: failure (%d:%d)\n", stp, err);
217
static void dbgp_disconnect(struct usb_gadget *gadget)
219
#ifdef CONFIG_USB_G_DBGP_PRINTK
222
gserial_disconnect(dbgp.serial);
226
static void dbgp_unbind(struct usb_gadget *gadget)
228
#ifdef CONFIG_USB_G_DBGP_SERIAL
232
kfree(dbgp.req->buf);
233
usb_ep_free_request(gadget->ep0, dbgp.req);
236
gadget->ep0->driver_data = NULL;
239
static int __init dbgp_configure_endpoints(struct usb_gadget *gadget)
243
usb_ep_autoconfig_reset(gadget);
245
dbgp.i_ep = usb_ep_autoconfig(gadget, &i_desc);
251
dbgp.i_ep->driver_data = gadget;
252
i_desc.wMaxPacketSize =
253
__constant_cpu_to_le16(USB_DEBUG_MAX_PACKET_SIZE);
255
dbgp.o_ep = usb_ep_autoconfig(gadget, &o_desc);
257
dbgp.i_ep->driver_data = NULL;
262
dbgp.o_ep->driver_data = gadget;
263
o_desc.wMaxPacketSize =
264
__constant_cpu_to_le16(USB_DEBUG_MAX_PACKET_SIZE);
266
dbg_desc.bDebugInEndpoint = i_desc.bEndpointAddress;
267
dbg_desc.bDebugOutEndpoint = o_desc.bEndpointAddress;
269
#ifdef CONFIG_USB_G_DBGP_SERIAL
270
dbgp.serial->in = dbgp.i_ep;
271
dbgp.serial->out = dbgp.o_ep;
273
dbgp.serial->in->desc = &i_desc;
274
dbgp.serial->out->desc = &o_desc;
276
if (gserial_setup(gadget, 1) < 0) {
284
dbgp.o_ep->driver_data = NULL;
289
dbgp.i_ep->driver_data = NULL;
291
dev_dbg(&dbgp.gadget->dev, "ep config: failure (%d)\n", stp);
295
static int __init dbgp_bind(struct usb_gadget *gadget)
299
dbgp.gadget = gadget;
301
dbgp.req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL);
308
dbgp.req->buf = kmalloc(DBGP_REQ_EP0_LEN, GFP_KERNEL);
309
if (!dbgp.req->buf) {
315
dbgp.req->length = DBGP_REQ_EP0_LEN;
316
gadget->ep0->driver_data = gadget;
318
#ifdef CONFIG_USB_G_DBGP_SERIAL
319
dbgp.serial = kzalloc(sizeof(struct gserial), GFP_KERNEL);
326
err = dbgp_configure_endpoints(gadget);
332
dev_dbg(&dbgp.gadget->dev, "bind: success\n");
336
dev_dbg(&gadget->dev, "bind: failure (%d:%d)\n", stp, err);
341
static void dbgp_setup_complete(struct usb_ep *ep,
342
struct usb_request *req)
344
dev_dbg(&dbgp.gadget->dev, "setup complete: %d, %d/%d\n",
345
req->status, req->actual, req->length);
348
static int dbgp_setup(struct usb_gadget *gadget,
349
const struct usb_ctrlrequest *ctrl)
351
struct usb_request *req = dbgp.req;
352
u8 request = ctrl->bRequest;
353
u16 value = le16_to_cpu(ctrl->wValue);
354
u16 length = le16_to_cpu(ctrl->wLength);
355
int err = -EOPNOTSUPP;
359
gadget->ep0->driver_data = gadget;
361
if (request == USB_REQ_GET_DESCRIPTOR) {
364
dev_dbg(&dbgp.gadget->dev, "setup: desc device\n");
365
len = sizeof device_desc;
367
device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
370
dev_dbg(&dbgp.gadget->dev, "setup: desc debug\n");
371
len = sizeof dbg_desc;
378
} else if (request == USB_REQ_SET_FEATURE &&
379
value == USB_DEVICE_DEBUG_MODE) {
380
dev_dbg(&dbgp.gadget->dev, "setup: feat debug\n");
381
#ifdef CONFIG_USB_G_DBGP_PRINTK
382
err = dbgp_enable_ep();
384
err = gserial_connect(dbgp.serial, 0);
391
req->length = min(length, len);
392
req->zero = len < req->length;
393
if (data && req->length)
394
memcpy(req->buf, data, req->length);
396
req->complete = dbgp_setup_complete;
397
return usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
400
dev_dbg(&dbgp.gadget->dev,
401
"setup: failure req %x v %x\n", request, value);
405
static struct usb_gadget_driver dbgp_driver = {
407
.speed = USB_SPEED_HIGH,
408
.unbind = dbgp_unbind,
410
.disconnect = dbgp_disconnect,
412
.owner = THIS_MODULE,
417
static int __init dbgp_init(void)
419
return usb_gadget_probe_driver(&dbgp_driver, dbgp_bind);
422
static void __exit dbgp_exit(void)
424
usb_gadget_unregister_driver(&dbgp_driver);
425
#ifdef CONFIG_USB_G_DBGP_SERIAL
430
MODULE_AUTHOR("Stephane Duverger");
431
MODULE_LICENSE("GPL");
432
module_init(dbgp_init);
433
module_exit(dbgp_exit);