drivers/usb/gadget/legacy/dbgp.c - SHIFTPHONES/mainline/linux - Gitiles

 // SPDX-License-Identifier: GPL-2.0
 /*
  * dbgp.c -- EHCI Debug Port device gadget
  *
  * Copyright (C) 2010 Stephane Duverger
  *
  * Released under the GPLv2.
  */

 /* verbose messages */
 #include <linux/kernel.h>
 #include <linux/device.h>
 #include <linux/module.h>
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>

 #include "u_serial.h"

 #define DRIVER_VENDOR_ID	0x0525 /* NetChip */
 #define DRIVER_PRODUCT_ID	0xc0de /* undefined */

 #define USB_DEBUG_MAX_PACKET_SIZE     8
 #define DBGP_REQ_EP0_LEN              128
 #define DBGP_REQ_LEN                  512

 static struct dbgp {
 	struct usb_gadget  *gadget;
 	struct usb_request *req;
 	struct usb_ep      *i_ep;
 	struct usb_ep      *o_ep;
 #ifdef CONFIG_USB_G_DBGP_SERIAL
 	struct gserial     *serial;
 #endif
 } dbgp;

 static struct usb_device_descriptor device_desc = {
 	.bLength = sizeof device_desc,
 	.bDescriptorType = USB_DT_DEVICE,
 	.bcdUSB = cpu_to_le16(0x0200),
 	.bDeviceClass =	USB_CLASS_VENDOR_SPEC,
 	.idVendor = cpu_to_le16(DRIVER_VENDOR_ID),
 	.idProduct = cpu_to_le16(DRIVER_PRODUCT_ID),
 	.bNumConfigurations = 1,
 };

 static struct usb_debug_descriptor dbg_desc = {
 	.bLength = sizeof dbg_desc,
 	.bDescriptorType = USB_DT_DEBUG,
 };

 static struct usb_endpoint_descriptor i_desc = {
 	.bLength = USB_DT_ENDPOINT_SIZE,
 	.bDescriptorType = USB_DT_ENDPOINT,
 	.bmAttributes = USB_ENDPOINT_XFER_BULK,
 	.bEndpointAddress = USB_DIR_IN,
 };

 static struct usb_endpoint_descriptor o_desc = {
 	.bLength = USB_DT_ENDPOINT_SIZE,
 	.bDescriptorType = USB_DT_ENDPOINT,
 	.bmAttributes = USB_ENDPOINT_XFER_BULK,
 	.bEndpointAddress = USB_DIR_OUT,
 };

 #ifdef CONFIG_USB_G_DBGP_PRINTK
 static int dbgp_consume(char *buf, unsigned len)
 {
 	char c;

 	if (!len)
 		return 0;

 	c = buf[len-1];
 	if (c != 0)
 		buf[len-1] = 0;

 	printk(KERN_NOTICE "%s%c", buf, c);
 	return 0;
 }

 static void __disable_ep(struct usb_ep *ep)
 {
 	usb_ep_disable(ep);
 }

 static void dbgp_disable_ep(void)
 {
 	__disable_ep(dbgp.i_ep);
 	__disable_ep(dbgp.o_ep);
 }

 static void dbgp_complete(struct usb_ep *ep, struct usb_request *req)
 {
 	int stp;
 	int err = 0;
 	int status = req->status;

 	if (ep == dbgp.i_ep) {
 		stp = 1;
 		goto fail;
 	}

 	if (status != 0) {
 		stp = 2;
 		goto release_req;
 	}

 	dbgp_consume(req->buf, req->actual);

 	req->length = DBGP_REQ_LEN;
 	err = usb_ep_queue(ep, req, GFP_ATOMIC);
 	if (err < 0) {
 		stp = 3;
 		goto release_req;
 	}

 	return;

 release_req:
 	kfree(req->buf);
 	usb_ep_free_request(dbgp.o_ep, req);
 	dbgp_disable_ep();
 fail:
 	dev_dbg(&dbgp.gadget->dev,
 		"complete: failure (%d:%d) ==> %d\n", stp, err, status);
 }

 static int dbgp_enable_ep_req(struct usb_ep *ep)
 {
 	int err, stp;
 	struct usb_request *req;

 	req = usb_ep_alloc_request(ep, GFP_KERNEL);
 	if (!req) {
 		err = -ENOMEM;
 		stp = 1;
 		goto fail_1;
 	}

 	req->buf = kzalloc(DBGP_REQ_LEN, GFP_KERNEL);
 	if (!req->buf) {
 		err = -ENOMEM;
 		stp = 2;
 		goto fail_2;
 	}

 	req->complete = dbgp_complete;
 	req->length = DBGP_REQ_LEN;
 	err = usb_ep_queue(ep, req, GFP_ATOMIC);
 	if (err < 0) {
 		stp = 3;
 		goto fail_3;
 	}

 	return 0;

 fail_3:
 	kfree(req->buf);
 fail_2:
 	usb_ep_free_request(dbgp.o_ep, req);
 fail_1:
 	dev_dbg(&dbgp.gadget->dev,
 		"enable ep req: failure (%d:%d)\n", stp, err);
 	return err;
 }

 static int __enable_ep(struct usb_ep *ep, struct usb_endpoint_descriptor *desc)
 {
 	int err;
 	ep->desc = desc;
 	err = usb_ep_enable(ep);
 	return err;
 }

 static int dbgp_enable_ep(void)
 {
 	int err, stp;

 	err = __enable_ep(dbgp.i_ep, &i_desc);
 	if (err < 0) {
 		stp = 1;
 		goto fail_1;
 	}

 	err = __enable_ep(dbgp.o_ep, &o_desc);
 	if (err < 0) {
 		stp = 2;
 		goto fail_2;
 	}

 	err = dbgp_enable_ep_req(dbgp.o_ep);
 	if (err < 0) {
 		stp = 3;
 		goto fail_3;
 	}

 	return 0;

 fail_3:
 	__disable_ep(dbgp.o_ep);
 fail_2:
 	__disable_ep(dbgp.i_ep);
 fail_1:
 	dev_dbg(&dbgp.gadget->dev, "enable ep: failure (%d:%d)\n", stp, err);
 	return err;
 }
 #endif

 static void dbgp_disconnect(struct usb_gadget *gadget)
 {
 #ifdef CONFIG_USB_G_DBGP_PRINTK
 	dbgp_disable_ep();
 #else
 	gserial_disconnect(dbgp.serial);
 #endif
 }

 static void dbgp_unbind(struct usb_gadget *gadget)
 {
 #ifdef CONFIG_USB_G_DBGP_SERIAL
 	kfree(dbgp.serial);
 	dbgp.serial = NULL;
 #endif
 	if (dbgp.req) {
 		kfree(dbgp.req->buf);
 		usb_ep_free_request(gadget->ep0, dbgp.req);
 		dbgp.req = NULL;
 	}
 }

 #ifdef CONFIG_USB_G_DBGP_SERIAL
 static unsigned char tty_line;
 #endif

 static int dbgp_configure_endpoints(struct usb_gadget *gadget)
 {
 	int stp;

 	usb_ep_autoconfig_reset(gadget);

 	dbgp.i_ep = usb_ep_autoconfig(gadget, &i_desc);
 	if (!dbgp.i_ep) {
 		stp = 1;
 		goto fail_1;
 	}

 	i_desc.wMaxPacketSize =
 		cpu_to_le16(USB_DEBUG_MAX_PACKET_SIZE);

 	dbgp.o_ep = usb_ep_autoconfig(gadget, &o_desc);
 	if (!dbgp.o_ep) {
 		stp = 2;
 		goto fail_1;
 	}

 	o_desc.wMaxPacketSize =
 		cpu_to_le16(USB_DEBUG_MAX_PACKET_SIZE);

 	dbg_desc.bDebugInEndpoint = i_desc.bEndpointAddress;
 	dbg_desc.bDebugOutEndpoint = o_desc.bEndpointAddress;

 #ifdef CONFIG_USB_G_DBGP_SERIAL
 	dbgp.serial->in = dbgp.i_ep;
 	dbgp.serial->out = dbgp.o_ep;

 	dbgp.serial->in->desc = &i_desc;
 	dbgp.serial->out->desc = &o_desc;
 #endif

 	return 0;

 fail_1:
 	dev_dbg(&dbgp.gadget->dev, "ep config: failure (%d)\n", stp);
 	return -ENODEV;
 }

 static int dbgp_bind(struct usb_gadget *gadget,
 		struct usb_gadget_driver *driver)
 {
 	int err, stp;

 	dbgp.gadget = gadget;

 	dbgp.req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL);
 	if (!dbgp.req) {
 		err = -ENOMEM;
 		stp = 1;
 		goto fail;
 	}

 	dbgp.req->buf = kmalloc(DBGP_REQ_EP0_LEN, GFP_KERNEL);
 	if (!dbgp.req->buf) {
 		err = -ENOMEM;
 		stp = 2;
 		goto fail;
 	}

 	dbgp.req->length = DBGP_REQ_EP0_LEN;

 #ifdef CONFIG_USB_G_DBGP_SERIAL
 	dbgp.serial = kzalloc(sizeof(struct gserial), GFP_KERNEL);
 	if (!dbgp.serial) {
 		stp = 3;
 		err = -ENOMEM;
 		goto fail;
 	}

 	if (gserial_alloc_line(&tty_line)) {
 		stp = 4;
 		err = -ENODEV;
 		goto fail;
 	}
 #endif

 	err = dbgp_configure_endpoints(gadget);
 	if (err < 0) {
 		stp = 5;
 		goto fail;
 	}

 	dev_dbg(&dbgp.gadget->dev, "bind: success\n");
 	return 0;

 fail:
 	dev_dbg(&gadget->dev, "bind: failure (%d:%d)\n", stp, err);
 	dbgp_unbind(gadget);
 	return err;
 }

 static void dbgp_setup_complete(struct usb_ep *ep,
 				struct usb_request *req)
 {
 	dev_dbg(&dbgp.gadget->dev, "setup complete: %d, %d/%d\n",
 		req->status, req->actual, req->length);
 }

 static int dbgp_setup(struct usb_gadget *gadget,
 		      const struct usb_ctrlrequest *ctrl)
 {
 	struct usb_request *req = dbgp.req;
 	u8 request = ctrl->bRequest;
 	u16 value = le16_to_cpu(ctrl->wValue);
 	u16 length = le16_to_cpu(ctrl->wLength);
 	int err = -EOPNOTSUPP;
 	void *data = NULL;
 	u16 len = 0;

 	if (length > DBGP_REQ_LEN) {
 		if (ctrl->bRequestType & USB_DIR_IN) {
 			/* Cast away the const, we are going to overwrite on purpose. */
 			__le16 *temp = (__le16 *)&ctrl->wLength;

 			*temp = cpu_to_le16(DBGP_REQ_LEN);
 			length = DBGP_REQ_LEN;
 		} else {
 			return err;
 		}
 	}


 	if (request == USB_REQ_GET_DESCRIPTOR) {
 		switch (value>>8) {
 		case USB_DT_DEVICE:
 			dev_dbg(&dbgp.gadget->dev, "setup: desc device\n");
 			len = sizeof device_desc;
 			data = &device_desc;
 			device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
 			break;
 		case USB_DT_DEBUG:
 			dev_dbg(&dbgp.gadget->dev, "setup: desc debug\n");
 			len = sizeof dbg_desc;
 			data = &dbg_desc;
 			break;
 		default:
 			goto fail;
 		}
 		err = 0;
 	} else if (request == USB_REQ_SET_FEATURE &&
 		   value == USB_DEVICE_DEBUG_MODE) {
 		dev_dbg(&dbgp.gadget->dev, "setup: feat debug\n");
 #ifdef CONFIG_USB_G_DBGP_PRINTK
 		err = dbgp_enable_ep();
 #else
 		err = dbgp_configure_endpoints(gadget);
 		if (err < 0) {
 			goto fail;
 		}
 		err = gserial_connect(dbgp.serial, tty_line);
 #endif
 		if (err < 0)
 			goto fail;
 	} else
 		goto fail;

 	req->length = min(length, len);
 	req->zero = len < req->length;
 	if (data && req->length)
 		memcpy(req->buf, data, req->length);

 	req->complete = dbgp_setup_complete;
 	return usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);

 fail:
 	dev_dbg(&dbgp.gadget->dev,
 		"setup: failure req %x v %x\n", request, value);
 	return err;
 }

 static struct usb_gadget_driver dbgp_driver = {
 	.function = "dbgp",
 	.max_speed = USB_SPEED_HIGH,
 	.bind = dbgp_bind,
 	.unbind = dbgp_unbind,
 	.setup = dbgp_setup,
 	.reset = dbgp_disconnect,
 	.disconnect = dbgp_disconnect,
 	.driver	= {
 		.owner = THIS_MODULE,
 		.name = "dbgp"
 	},
 };

 static int __init dbgp_init(void)
 {
 	return usb_gadget_probe_driver(&dbgp_driver);
 }

 static void __exit dbgp_exit(void)
 {
 	usb_gadget_unregister_driver(&dbgp_driver);
 #ifdef CONFIG_USB_G_DBGP_SERIAL
 	gserial_free_line(tty_line);
 #endif
 }

 MODULE_AUTHOR("Stephane Duverger");
 MODULE_LICENSE("GPL");
 module_init(dbgp_init);
 module_exit(dbgp_exit);
	// SPDX-License-Identifier: GPL-2.0
	/*
	* dbgp.c -- EHCI Debug Port device gadget
	*
	* Copyright (C) 2010 Stephane Duverger
	*
	* Released under the GPLv2.
	*/

	/* verbose messages */
	#include <linux/kernel.h>
	#include <linux/device.h>
	#include <linux/module.h>
	#include <linux/usb/ch9.h>
	#include <linux/usb/gadget.h>

	#include "u_serial.h"

	#define DRIVER_VENDOR_ID 0x0525 /* NetChip */
	#define DRIVER_PRODUCT_ID 0xc0de /* undefined */

	#define USB_DEBUG_MAX_PACKET_SIZE 8
	#define DBGP_REQ_EP0_LEN 128
	#define DBGP_REQ_LEN 512

	static struct dbgp {
	struct usb_gadget *gadget;
	struct usb_request *req;
	struct usb_ep *i_ep;
	struct usb_ep *o_ep;
	#ifdef CONFIG_USB_G_DBGP_SERIAL
	struct gserial *serial;
	#endif
	} dbgp;

	static struct usb_device_descriptor device_desc = {
	.bLength = sizeof device_desc,
	.bDescriptorType = USB_DT_DEVICE,
	.bcdUSB = cpu_to_le16(0x0200),
	.bDeviceClass = USB_CLASS_VENDOR_SPEC,
	.idVendor = cpu_to_le16(DRIVER_VENDOR_ID),
	.idProduct = cpu_to_le16(DRIVER_PRODUCT_ID),
	.bNumConfigurations = 1,
	};

	static struct usb_debug_descriptor dbg_desc = {
	.bLength = sizeof dbg_desc,
	.bDescriptorType = USB_DT_DEBUG,
	};

	static struct usb_endpoint_descriptor i_desc = {
	.bLength = USB_DT_ENDPOINT_SIZE,
	.bDescriptorType = USB_DT_ENDPOINT,
	.bmAttributes = USB_ENDPOINT_XFER_BULK,
	.bEndpointAddress = USB_DIR_IN,
	};

	static struct usb_endpoint_descriptor o_desc = {
	.bLength = USB_DT_ENDPOINT_SIZE,
	.bDescriptorType = USB_DT_ENDPOINT,
	.bmAttributes = USB_ENDPOINT_XFER_BULK,
	.bEndpointAddress = USB_DIR_OUT,
	};

	#ifdef CONFIG_USB_G_DBGP_PRINTK
	static int dbgp_consume(char *buf, unsigned len)
	{
	char c;

	if (!len)
	return 0;

	c = buf[len-1];
	if (c != 0)
	buf[len-1] = 0;

	printk(KERN_NOTICE "%s%c", buf, c);
	return 0;
	}

	static void __disable_ep(struct usb_ep *ep)
	{
	usb_ep_disable(ep);
	}

	static void dbgp_disable_ep(void)
	{
	__disable_ep(dbgp.i_ep);
	__disable_ep(dbgp.o_ep);
	}

	static void dbgp_complete(struct usb_ep ep, struct usb_request req)
	{
	int stp;
	int err = 0;
	int status = req->status;

	if (ep == dbgp.i_ep) {
	stp = 1;
	goto fail;
	}

	if (status != 0) {
	stp = 2;
	goto release_req;
	}

	dbgp_consume(req->buf, req->actual);

	req->length = DBGP_REQ_LEN;
	err = usb_ep_queue(ep, req, GFP_ATOMIC);
	if (err < 0) {
	stp = 3;
	goto release_req;
	}

	return;

	release_req:
	kfree(req->buf);
	usb_ep_free_request(dbgp.o_ep, req);
	dbgp_disable_ep();
	fail:
	dev_dbg(&dbgp.gadget->dev,
	"complete: failure (%d:%d) ==> %d\n", stp, err, status);
	}

	static int dbgp_enable_ep_req(struct usb_ep *ep)
	{
	int err, stp;
	struct usb_request *req;

	req = usb_ep_alloc_request(ep, GFP_KERNEL);
	if (!req) {
	err = -ENOMEM;
	stp = 1;
	goto fail_1;
	}

	req->buf = kzalloc(DBGP_REQ_LEN, GFP_KERNEL);
	if (!req->buf) {
	err = -ENOMEM;
	stp = 2;
	goto fail_2;
	}

	req->complete = dbgp_complete;
	req->length = DBGP_REQ_LEN;
	err = usb_ep_queue(ep, req, GFP_ATOMIC);
	if (err < 0) {
	stp = 3;
	goto fail_3;
	}

	return 0;

	fail_3:
	kfree(req->buf);
	fail_2:
	usb_ep_free_request(dbgp.o_ep, req);
	fail_1:
	dev_dbg(&dbgp.gadget->dev,
	"enable ep req: failure (%d:%d)\n", stp, err);
	return err;
	}

	static int __enable_ep(struct usb_ep ep, struct usb_endpoint_descriptor desc)
	{
	int err;
	ep->desc = desc;
	err = usb_ep_enable(ep);
	return err;
	}

	static int dbgp_enable_ep(void)
	{
	int err, stp;

	err = __enable_ep(dbgp.i_ep, &i_desc);
	if (err < 0) {
	stp = 1;
	goto fail_1;
	}

	err = __enable_ep(dbgp.o_ep, &o_desc);
	if (err < 0) {
	stp = 2;
	goto fail_2;
	}

	err = dbgp_enable_ep_req(dbgp.o_ep);
	if (err < 0) {
	stp = 3;
	goto fail_3;
	}

	return 0;

	fail_3:
	__disable_ep(dbgp.o_ep);
	fail_2:
	__disable_ep(dbgp.i_ep);
	fail_1:
	dev_dbg(&dbgp.gadget->dev, "enable ep: failure (%d:%d)\n", stp, err);
	return err;
	}
	#endif

	static void dbgp_disconnect(struct usb_gadget *gadget)
	{
	#ifdef CONFIG_USB_G_DBGP_PRINTK
	dbgp_disable_ep();
	#else
	gserial_disconnect(dbgp.serial);
	#endif
	}

	static void dbgp_unbind(struct usb_gadget *gadget)
	{
	#ifdef CONFIG_USB_G_DBGP_SERIAL
	kfree(dbgp.serial);
	dbgp.serial = NULL;
	#endif
	if (dbgp.req) {
	kfree(dbgp.req->buf);
	usb_ep_free_request(gadget->ep0, dbgp.req);
	dbgp.req = NULL;
	}
	}

	#ifdef CONFIG_USB_G_DBGP_SERIAL
	static unsigned char tty_line;
	#endif

	static int dbgp_configure_endpoints(struct usb_gadget *gadget)
	{
	int stp;

	usb_ep_autoconfig_reset(gadget);

	dbgp.i_ep = usb_ep_autoconfig(gadget, &i_desc);
	if (!dbgp.i_ep) {
	stp = 1;
	goto fail_1;
	}

	i_desc.wMaxPacketSize =
	cpu_to_le16(USB_DEBUG_MAX_PACKET_SIZE);

	dbgp.o_ep = usb_ep_autoconfig(gadget, &o_desc);
	if (!dbgp.o_ep) {
	stp = 2;
	goto fail_1;
	}

	o_desc.wMaxPacketSize =
	cpu_to_le16(USB_DEBUG_MAX_PACKET_SIZE);

	dbg_desc.bDebugInEndpoint = i_desc.bEndpointAddress;
	dbg_desc.bDebugOutEndpoint = o_desc.bEndpointAddress;

	#ifdef CONFIG_USB_G_DBGP_SERIAL
	dbgp.serial->in = dbgp.i_ep;
	dbgp.serial->out = dbgp.o_ep;

	dbgp.serial->in->desc = &i_desc;
	dbgp.serial->out->desc = &o_desc;
	#endif

	return 0;

	fail_1:
	dev_dbg(&dbgp.gadget->dev, "ep config: failure (%d)\n", stp);
	return -ENODEV;
	}

	static int dbgp_bind(struct usb_gadget *gadget,
	struct usb_gadget_driver *driver)
	{
	int err, stp;

	dbgp.gadget = gadget;

	dbgp.req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL);
	if (!dbgp.req) {
	err = -ENOMEM;
	stp = 1;
	goto fail;
	}

	dbgp.req->buf = kmalloc(DBGP_REQ_EP0_LEN, GFP_KERNEL);
	if (!dbgp.req->buf) {
	err = -ENOMEM;
	stp = 2;
	goto fail;
	}

	dbgp.req->length = DBGP_REQ_EP0_LEN;

	#ifdef CONFIG_USB_G_DBGP_SERIAL
	dbgp.serial = kzalloc(sizeof(struct gserial), GFP_KERNEL);
	if (!dbgp.serial) {
	stp = 3;
	err = -ENOMEM;
	goto fail;
	}

	if (gserial_alloc_line(&tty_line)) {
	stp = 4;
	err = -ENODEV;
	goto fail;
	}
	#endif

	err = dbgp_configure_endpoints(gadget);
	if (err < 0) {
	stp = 5;
	goto fail;
	}

	dev_dbg(&dbgp.gadget->dev, "bind: success\n");
	return 0;

	fail:
	dev_dbg(&gadget->dev, "bind: failure (%d:%d)\n", stp, err);
	dbgp_unbind(gadget);
	return err;
	}

	static void dbgp_setup_complete(struct usb_ep *ep,
	struct usb_request *req)
	{
	dev_dbg(&dbgp.gadget->dev, "setup complete: %d, %d/%d\n",
	req->status, req->actual, req->length);
	}

	static int dbgp_setup(struct usb_gadget *gadget,
	const struct usb_ctrlrequest *ctrl)
	{
	struct usb_request *req = dbgp.req;
	u8 request = ctrl->bRequest;
	u16 value = le16_to_cpu(ctrl->wValue);
	u16 length = le16_to_cpu(ctrl->wLength);
	int err = -EOPNOTSUPP;
	void *data = NULL;
	u16 len = 0;

	if (length > DBGP_REQ_LEN) {
	if (ctrl->bRequestType & USB_DIR_IN) {
	/* Cast away the const, we are going to overwrite on purpose. */
	__le16 temp = (__le16 )&ctrl->wLength;

	*temp = cpu_to_le16(DBGP_REQ_LEN);
	length = DBGP_REQ_LEN;
	} else {
	return err;
	}
	}


	if (request == USB_REQ_GET_DESCRIPTOR) {
	switch (value>>8) {
	case USB_DT_DEVICE:
	dev_dbg(&dbgp.gadget->dev, "setup: desc device\n");
	len = sizeof device_desc;
	data = &device_desc;
	device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
	break;
	case USB_DT_DEBUG:
	dev_dbg(&dbgp.gadget->dev, "setup: desc debug\n");
	len = sizeof dbg_desc;
	data = &dbg_desc;
	break;
	default:
	goto fail;
	}
	err = 0;
	} else if (request == USB_REQ_SET_FEATURE &&
	value == USB_DEVICE_DEBUG_MODE) {
	dev_dbg(&dbgp.gadget->dev, "setup: feat debug\n");
	#ifdef CONFIG_USB_G_DBGP_PRINTK
	err = dbgp_enable_ep();
	#else
	err = dbgp_configure_endpoints(gadget);
	if (err < 0) {
	goto fail;
	}
	err = gserial_connect(dbgp.serial, tty_line);
	#endif
	if (err < 0)
	goto fail;
	} else
	goto fail;

	req->length = min(length, len);
	req->zero = len < req->length;
	if (data && req->length)
	memcpy(req->buf, data, req->length);

	req->complete = dbgp_setup_complete;
	return usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);

	fail:
	dev_dbg(&dbgp.gadget->dev,
	"setup: failure req %x v %x\n", request, value);
	return err;
	}

	static struct usb_gadget_driver dbgp_driver = {
	.function = "dbgp",
	.max_speed = USB_SPEED_HIGH,
	.bind = dbgp_bind,
	.unbind = dbgp_unbind,
	.setup = dbgp_setup,
	.reset = dbgp_disconnect,
	.disconnect = dbgp_disconnect,
	.driver = {
	.owner = THIS_MODULE,
	.name = "dbgp"
	},
	};

	static int __init dbgp_init(void)
	{
	return usb_gadget_probe_driver(&dbgp_driver);
	}

	static void __exit dbgp_exit(void)
	{
	usb_gadget_unregister_driver(&dbgp_driver);
	#ifdef CONFIG_USB_G_DBGP_SERIAL
	gserial_free_line(tty_line);
	#endif
	}

	MODULE_AUTHOR("Stephane Duverger");
	MODULE_LICENSE("GPL");
	module_init(dbgp_init);
	module_exit(dbgp_exit);