usb: gadget: Gadget directory cleanup - group usb functions

The drivers/usb/gadget directory contains many files.
Files which are related can be distributed into separate directories.
This patch moves the USB functions implementations into a separate directory.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 763 insertions, 0 deletions

diff --git a/drivers/usb/gadget/function/f_hid.c b/drivers/usb/gadget/function/f_hid.c
new file mode 100644
index 0000000..a95290a
--- /dev/null
+++ b/drivers/usb/gadget/function/f_hid.c
@@ -0,0 +1,763 @@
+/*
+ * f_hid.c -- USB HID function driver
+ *
+ * Copyright (C) 2010 Fabien Chouteau <fabien.chouteau@barco.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/hid.h>
+#include <linux/cdev.h>
+#include <linux/mutex.h>
+#include <linux/poll.h>
+#include <linux/uaccess.h>
+#include <linux/wait.h>
+#include <linux/sched.h>
+#include <linux/usb/g_hid.h>
+
+#include "u_f.h"
+
+static int major, minors;
+static struct class *hidg_class;
+
+/*-------------------------------------------------------------------------*/
+/*                            HID gadget struct                            */
+
+struct f_hidg_req_list {
+	struct usb_request	*req;
+	unsigned int		pos;
+	struct list_head 	list;
+};
+
+struct f_hidg {
+	/* configuration */
+	unsigned char			bInterfaceSubClass;
+	unsigned char			bInterfaceProtocol;
+	unsigned short			report_desc_length;
+	char				*report_desc;
+	unsigned short			report_length;
+
+	/* recv report */
+	struct list_head		completed_out_req;
+	spinlock_t			spinlock;
+	wait_queue_head_t		read_queue;
+	unsigned int			qlen;
+
+	/* send report */
+	struct mutex			lock;
+	bool				write_pending;
+	wait_queue_head_t		write_queue;
+	struct usb_request		*req;
+
+	int				minor;
+	struct cdev			cdev;
+	struct usb_function		func;
+
+	struct usb_ep			*in_ep;
+	struct usb_ep			*out_ep;
+};
+
+static inline struct f_hidg *func_to_hidg(struct usb_function *f)
+{
+	return container_of(f, struct f_hidg, func);
+}
+
+/*-------------------------------------------------------------------------*/
+/*                           Static descriptors                            */
+
+static struct usb_interface_descriptor hidg_interface_desc = {
+	.bLength		= sizeof hidg_interface_desc,
+	.bDescriptorType	= USB_DT_INTERFACE,
+	/* .bInterfaceNumber	= DYNAMIC */
+	.bAlternateSetting	= 0,
+	.bNumEndpoints		= 2,
+	.bInterfaceClass	= USB_CLASS_HID,
+	/* .bInterfaceSubClass	= DYNAMIC */
+	/* .bInterfaceProtocol	= DYNAMIC */
+	/* .iInterface		= DYNAMIC */
+};
+
+static struct hid_descriptor hidg_desc = {
+	.bLength			= sizeof hidg_desc,
+	.bDescriptorType		= HID_DT_HID,
+	.bcdHID				= 0x0101,
+	.bCountryCode			= 0x00,
+	.bNumDescriptors		= 0x1,
+	/*.desc[0].bDescriptorType	= DYNAMIC */
+	/*.desc[0].wDescriptorLenght	= DYNAMIC */
+};
+
+/* High-Speed Support */
+
+static struct usb_endpoint_descriptor hidg_hs_in_ep_desc = {
+	.bLength		= USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType	= USB_DT_ENDPOINT,
+	.bEndpointAddress	= USB_DIR_IN,
+	.bmAttributes		= USB_ENDPOINT_XFER_INT,
+	/*.wMaxPacketSize	= DYNAMIC */
+	.bInterval		= 4, /* FIXME: Add this field in the
+				      * HID gadget configuration?
+				      * (struct hidg_func_descriptor)
+				      */
+};
+
+static struct usb_endpoint_descriptor hidg_hs_out_ep_desc = {
+	.bLength		= USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType	= USB_DT_ENDPOINT,
+	.bEndpointAddress	= USB_DIR_OUT,
+	.bmAttributes		= USB_ENDPOINT_XFER_INT,
+	/*.wMaxPacketSize	= DYNAMIC */
+	.bInterval		= 4, /* FIXME: Add this field in the
+				      * HID gadget configuration?
+				      * (struct hidg_func_descriptor)
+				      */
+};
+
+static struct usb_descriptor_header *hidg_hs_descriptors[] = {
+	(struct usb_descriptor_header *)&hidg_interface_desc,
+	(struct usb_descriptor_header *)&hidg_desc,
+	(struct usb_descriptor_header *)&hidg_hs_in_ep_desc,
+	(struct usb_descriptor_header *)&hidg_hs_out_ep_desc,
+	NULL,
+};
+
+/* Full-Speed Support */
+
+static struct usb_endpoint_descriptor hidg_fs_in_ep_desc = {
+	.bLength		= USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType	= USB_DT_ENDPOINT,
+	.bEndpointAddress	= USB_DIR_IN,
+	.bmAttributes		= USB_ENDPOINT_XFER_INT,
+	/*.wMaxPacketSize	= DYNAMIC */
+	.bInterval		= 10, /* FIXME: Add this field in the
+				       * HID gadget configuration?
+				       * (struct hidg_func_descriptor)
+				       */
+};
+
+static struct usb_endpoint_descriptor hidg_fs_out_ep_desc = {
+	.bLength		= USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType	= USB_DT_ENDPOINT,
+	.bEndpointAddress	= USB_DIR_OUT,
+	.bmAttributes		= USB_ENDPOINT_XFER_INT,
+	/*.wMaxPacketSize	= DYNAMIC */
+	.bInterval		= 10, /* FIXME: Add this field in the
+				       * HID gadget configuration?
+				       * (struct hidg_func_descriptor)
+				       */
+};
+
+static struct usb_descriptor_header *hidg_fs_descriptors[] = {
+	(struct usb_descriptor_header *)&hidg_interface_desc,
+	(struct usb_descriptor_header *)&hidg_desc,
+	(struct usb_descriptor_header *)&hidg_fs_in_ep_desc,
+	(struct usb_descriptor_header *)&hidg_fs_out_ep_desc,
+	NULL,
+};
+
+/*-------------------------------------------------------------------------*/
+/*                              Char Device                                */
+
+static ssize_t f_hidg_read(struct file *file, char __user *buffer,
+			size_t count, loff_t *ptr)
+{
+	struct f_hidg *hidg = file->private_data;
+	struct f_hidg_req_list *list;
+	struct usb_request *req;
+	unsigned long flags;
+	int ret;
+
+	if (!count)
+		return 0;
+
+	if (!access_ok(VERIFY_WRITE, buffer, count))
+		return -EFAULT;
+
+	spin_lock_irqsave(&hidg->spinlock, flags);
+
+#define READ_COND (!list_empty(&hidg->completed_out_req))
+
+	/* wait for at least one buffer to complete */
+	while (!READ_COND) {
+		spin_unlock_irqrestore(&hidg->spinlock, flags);
+		if (file->f_flags & O_NONBLOCK)
+			return -EAGAIN;
+
+		if (wait_event_interruptible(hidg->read_queue, READ_COND))
+			return -ERESTARTSYS;
+
+		spin_lock_irqsave(&hidg->spinlock, flags);
+	}
+
+	/* pick the first one */
+	list = list_first_entry(&hidg->completed_out_req,
+				struct f_hidg_req_list, list);
+	req = list->req;
+	count = min_t(unsigned int, count, req->actual - list->pos);
+	spin_unlock_irqrestore(&hidg->spinlock, flags);
+
+	/* copy to user outside spinlock */
+	count -= copy_to_user(buffer, req->buf + list->pos, count);
+	list->pos += count;
+
+	/*
+	 * if this request is completely handled and transfered to
+	 * userspace, remove its entry from the list and requeue it
+	 * again. Otherwise, we will revisit it again upon the next
+	 * call, taking into account its current read position.
+	 */
+	if (list->pos == req->actual) {
+		spin_lock_irqsave(&hidg->spinlock, flags);
+		list_del(&list->list);
+		kfree(list);
+		spin_unlock_irqrestore(&hidg->spinlock, flags);
+
+		req->length = hidg->report_length;
+		ret = usb_ep_queue(hidg->out_ep, req, GFP_KERNEL);
+		if (ret < 0)
+			return ret;
+	}
+
+	return count;
+}
+
+static void f_hidg_req_complete(struct usb_ep *ep, struct usb_request *req)
+{
+	struct f_hidg *hidg = (struct f_hidg *)ep->driver_data;
+
+	if (req->status != 0) {
+		ERROR(hidg->func.config->cdev,
+			"End Point Request ERROR: %d\n", req->status);
+	}
+
+	hidg->write_pending = 0;
+	wake_up(&hidg->write_queue);
+}
+
+static ssize_t f_hidg_write(struct file *file, const char __user *buffer,
+			    size_t count, loff_t *offp)
+{
+	struct f_hidg *hidg  = file->private_data;
+	ssize_t status = -ENOMEM;
+
+	if (!access_ok(VERIFY_READ, buffer, count))
+		return -EFAULT;
+
+	mutex_lock(&hidg->lock);
+
+#define WRITE_COND (!hidg->write_pending)
+
+	/* write queue */
+	while (!WRITE_COND) {
+		mutex_unlock(&hidg->lock);
+		if (file->f_flags & O_NONBLOCK)
+			return -EAGAIN;
+
+		if (wait_event_interruptible_exclusive(
+				hidg->write_queue, WRITE_COND))
+			return -ERESTARTSYS;
+
+		mutex_lock(&hidg->lock);
+	}
+
+	count  = min_t(unsigned, count, hidg->report_length);
+	status = copy_from_user(hidg->req->buf, buffer, count);
+
+	if (status != 0) {
+		ERROR(hidg->func.config->cdev,
+			"copy_from_user error\n");
+		mutex_unlock(&hidg->lock);
+		return -EINVAL;
+	}
+
+	hidg->req->status   = 0;
+	hidg->req->zero     = 0;
+	hidg->req->length   = count;
+	hidg->req->complete = f_hidg_req_complete;
+	hidg->req->context  = hidg;
+	hidg->write_pending = 1;
+
+	status = usb_ep_queue(hidg->in_ep, hidg->req, GFP_ATOMIC);
+	if (status < 0) {
+		ERROR(hidg->func.config->cdev,
+			"usb_ep_queue error on int endpoint %zd\n", status);
+		hidg->write_pending = 0;
+		wake_up(&hidg->write_queue);
+	} else {
+		status = count;
+	}
+
+	mutex_unlock(&hidg->lock);
+
+	return status;
+}
+
+static unsigned int f_hidg_poll(struct file *file, poll_table *wait)
+{
+	struct f_hidg	*hidg  = file->private_data;
+	unsigned int	ret = 0;
+
+	poll_wait(file, &hidg->read_queue, wait);
+	poll_wait(file, &hidg->write_queue, wait);
+
+	if (WRITE_COND)
+		ret |= POLLOUT | POLLWRNORM;
+
+	if (READ_COND)
+		ret |= POLLIN | POLLRDNORM;
+
+	return ret;
+}
+
+#undef WRITE_COND
+#undef READ_COND
+
+static int f_hidg_release(struct inode *inode, struct file *fd)
+{
+	fd->private_data = NULL;
+	return 0;
+}
+
+static int f_hidg_open(struct inode *inode, struct file *fd)
+{
+	struct f_hidg *hidg =
+		container_of(inode->i_cdev, struct f_hidg, cdev);
+
+	fd->private_data = hidg;
+
+	return 0;
+}
+
+/*-------------------------------------------------------------------------*/
+/*                                usb_function                             */
+
+static inline struct usb_request *hidg_alloc_ep_req(struct usb_ep *ep,
+						    unsigned length)
+{
+	return alloc_ep_req(ep, length, length);
+}
+
+static void hidg_set_report_complete(struct usb_ep *ep, struct usb_request *req)
+{
+	struct f_hidg *hidg = (struct f_hidg *) req->context;
+	struct f_hidg_req_list *req_list;
+	unsigned long flags;
+
+	req_list = kzalloc(sizeof(*req_list), GFP_ATOMIC);
+	if (!req_list)
+		return;
+
+	req_list->req = req;
+
+	spin_lock_irqsave(&hidg->spinlock, flags);
+	list_add_tail(&req_list->list, &hidg->completed_out_req);
+	spin_unlock_irqrestore(&hidg->spinlock, flags);
+
+	wake_up(&hidg->read_queue);
+}
+
+static int hidg_setup(struct usb_function *f,
+		const struct usb_ctrlrequest *ctrl)
+{
+	struct f_hidg			*hidg = func_to_hidg(f);
+	struct usb_composite_dev	*cdev = f->config->cdev;
+	struct usb_request		*req  = cdev->req;
+	int status = 0;
+	__u16 value, length;
+
+	value	= __le16_to_cpu(ctrl->wValue);
+	length	= __le16_to_cpu(ctrl->wLength);
+
+	VDBG(cdev, "hid_setup crtl_request : bRequestType:0x%x bRequest:0x%x "
+		"Value:0x%x\n", ctrl->bRequestType, ctrl->bRequest, value);
+
+	switch ((ctrl->bRequestType << 8) | ctrl->bRequest) {
+	case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8
+		  | HID_REQ_GET_REPORT):
+		VDBG(cdev, "get_report\n");
+
+		/* send an empty report */
+		length = min_t(unsigned, length, hidg->report_length);
+		memset(req->buf, 0x0, length);
+
+		goto respond;
+		break;
+
+	case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8
+		  | HID_REQ_GET_PROTOCOL):
+		VDBG(cdev, "get_protocol\n");
+		goto stall;
+		break;
+
+	case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8
+		  | HID_REQ_SET_REPORT):
+		VDBG(cdev, "set_report | wLenght=%d\n", ctrl->wLength);
+		goto stall;
+		break;
+
+	case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8
+		  | HID_REQ_SET_PROTOCOL):
+		VDBG(cdev, "set_protocol\n");
+		goto stall;
+		break;
+
+	case ((USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_INTERFACE) << 8
+		  | USB_REQ_GET_DESCRIPTOR):
+		switch (value >> 8) {
+		case HID_DT_HID:
+			VDBG(cdev, "USB_REQ_GET_DESCRIPTOR: HID\n");
+			length = min_t(unsigned short, length,
+						   hidg_desc.bLength);
+			memcpy(req->buf, &hidg_desc, length);
+			goto respond;
+			break;
+		case HID_DT_REPORT:
+			VDBG(cdev, "USB_REQ_GET_DESCRIPTOR: REPORT\n");
+			length = min_t(unsigned short, length,
+						   hidg->report_desc_length);
+			memcpy(req->buf, hidg->report_desc, length);
+			goto respond;
+			break;
+
+		default:
+			VDBG(cdev, "Unknown descriptor request 0x%x\n",
+				 value >> 8);
+			goto stall;
+			break;
+		}
+		break;
+
+	default:
+		VDBG(cdev, "Unknown request 0x%x\n",
+			 ctrl->bRequest);
+		goto stall;
+		break;
+	}
+
+stall:
+	return -EOPNOTSUPP;
+
+respond:
+	req->zero = 0;
+	req->length = length;
+	status = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
+	if (status < 0)
+		ERROR(cdev, "usb_ep_queue error on ep0 %d\n", value);
+	return status;
+}
+
+static void hidg_disable(struct usb_function *f)
+{
+	struct f_hidg *hidg = func_to_hidg(f);
+	struct f_hidg_req_list *list, *next;
+
+	usb_ep_disable(hidg->in_ep);
+	hidg->in_ep->driver_data = NULL;
+
+	usb_ep_disable(hidg->out_ep);
+	hidg->out_ep->driver_data = NULL;
+
+	list_for_each_entry_safe(list, next, &hidg->completed_out_req, list) {
+		list_del(&list->list);
+		kfree(list);
+	}
+}
+
+static int hidg_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
+{
+	struct usb_composite_dev		*cdev = f->config->cdev;
+	struct f_hidg				*hidg = func_to_hidg(f);
+	int i, status = 0;
+
+	VDBG(cdev, "hidg_set_alt intf:%d alt:%d\n", intf, alt);
+
+	if (hidg->in_ep != NULL) {
+		/* restart endpoint */
+		if (hidg->in_ep->driver_data != NULL)
+			usb_ep_disable(hidg->in_ep);
+
+		status = config_ep_by_speed(f->config->cdev->gadget, f,
+					    hidg->in_ep);
+		if (status) {
+			ERROR(cdev, "config_ep_by_speed FAILED!\n");
+			goto fail;
+		}
+		status = usb_ep_enable(hidg->in_ep);
+		if (status < 0) {
+			ERROR(cdev, "Enable IN endpoint FAILED!\n");
+			goto fail;
+		}
+		hidg->in_ep->driver_data = hidg;
+	}
+
+
+	if (hidg->out_ep != NULL) {
+		/* restart endpoint */
+		if (hidg->out_ep->driver_data != NULL)
+			usb_ep_disable(hidg->out_ep);
+
+		status = config_ep_by_speed(f->config->cdev->gadget, f,
+					    hidg->out_ep);
+		if (status) {
+			ERROR(cdev, "config_ep_by_speed FAILED!\n");
+			goto fail;
+		}
+		status = usb_ep_enable(hidg->out_ep);
+		if (status < 0) {
+			ERROR(cdev, "Enable IN endpoint FAILED!\n");
+			goto fail;
+		}
+		hidg->out_ep->driver_data = hidg;
+
+		/*
+		 * allocate a bunch of read buffers and queue them all at once.
+		 */
+		for (i = 0; i < hidg->qlen && status == 0; i++) {
+			struct usb_request *req =
+					hidg_alloc_ep_req(hidg->out_ep,
+							  hidg->report_length);
+			if (req) {
+				req->complete = hidg_set_report_complete;
+				req->context  = hidg;
+				status = usb_ep_queue(hidg->out_ep, req,
+						      GFP_ATOMIC);
+				if (status)
+					ERROR(cdev, "%s queue req --> %d\n",
+						hidg->out_ep->name, status);
+			} else {
+				usb_ep_disable(hidg->out_ep);
+				hidg->out_ep->driver_data = NULL;
+				status = -ENOMEM;
+				goto fail;
+			}
+		}
+	}
+
+fail:
+	return status;
+}
+
+const struct file_operations f_hidg_fops = {
+	.owner		= THIS_MODULE,
+	.open		= f_hidg_open,
+	.release	= f_hidg_release,
+	.write		= f_hidg_write,
+	.read		= f_hidg_read,
+	.poll		= f_hidg_poll,
+	.llseek		= noop_llseek,
+};
+
+static int __init hidg_bind(struct usb_configuration *c, struct usb_function *f)
+{
+	struct usb_ep		*ep;
+	struct f_hidg		*hidg = func_to_hidg(f);
+	int			status;
+	dev_t			dev;
+
+	/* allocate instance-specific interface IDs, and patch descriptors */
+	status = usb_interface_id(c, f);
+	if (status < 0)
+		goto fail;
+	hidg_interface_desc.bInterfaceNumber = status;
+
+	/* allocate instance-specific endpoints */
+	status = -ENODEV;
+	ep = usb_ep_autoconfig(c->cdev->gadget, &hidg_fs_in_ep_desc);
+	if (!ep)
+		goto fail;
+	ep->driver_data = c->cdev;	/* claim */
+	hidg->in_ep = ep;
+
+	ep = usb_ep_autoconfig(c->cdev->gadget, &hidg_fs_out_ep_desc);
+	if (!ep)
+		goto fail;
+	ep->driver_data = c->cdev;	/* claim */
+	hidg->out_ep = ep;
+
+	/* preallocate request and buffer */
+	status = -ENOMEM;
+	hidg->req = usb_ep_alloc_request(hidg->in_ep, GFP_KERNEL);
+	if (!hidg->req)
+		goto fail;
+
+	hidg->req->buf = kmalloc(hidg->report_length, GFP_KERNEL);
+	if (!hidg->req->buf)
+		goto fail;
+
+	/* set descriptor dynamic values */
+	hidg_interface_desc.bInterfaceSubClass = hidg->bInterfaceSubClass;
+	hidg_interface_desc.bInterfaceProtocol = hidg->bInterfaceProtocol;
+	hidg_hs_in_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length);
+	hidg_fs_in_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length);
+	hidg_hs_out_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length);
+	hidg_fs_out_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length);
+	hidg_desc.desc[0].bDescriptorType = HID_DT_REPORT;
+	hidg_desc.desc[0].wDescriptorLength =
+		cpu_to_le16(hidg->report_desc_length);
+
+	hidg_hs_in_ep_desc.bEndpointAddress =
+		hidg_fs_in_ep_desc.bEndpointAddress;
+	hidg_hs_out_ep_desc.bEndpointAddress =
+		hidg_fs_out_ep_desc.bEndpointAddress;
+
+	status = usb_assign_descriptors(f, hidg_fs_descriptors,
+			hidg_hs_descriptors, NULL);
+	if (status)
+		goto fail;
+
+	mutex_init(&hidg->lock);
+	spin_lock_init(&hidg->spinlock);
+	init_waitqueue_head(&hidg->write_queue);
+	init_waitqueue_head(&hidg->read_queue);
+	INIT_LIST_HEAD(&hidg->completed_out_req);
+
+	/* create char device */
+	cdev_init(&hidg->cdev, &f_hidg_fops);
+	dev = MKDEV(major, hidg->minor);
+	status = cdev_add(&hidg->cdev, dev, 1);
+	if (status)
+		goto fail;
+
+	device_create(hidg_class, NULL, dev, NULL, "%s%d", "hidg", hidg->minor);
+
+	return 0;
+
+fail:
+	ERROR(f->config->cdev, "hidg_bind FAILED\n");
+	if (hidg->req != NULL) {
+		kfree(hidg->req->buf);
+		if (hidg->in_ep != NULL)
+			usb_ep_free_request(hidg->in_ep, hidg->req);
+	}
+
+	usb_free_all_descriptors(f);
+	return status;
+}
+
+static void hidg_unbind(struct usb_configuration *c, struct usb_function *f)
+{
+	struct f_hidg *hidg = func_to_hidg(f);
+
+	device_destroy(hidg_class, MKDEV(major, hidg->minor));
+	cdev_del(&hidg->cdev);
+
+	/* disable/free request and end point */
+	usb_ep_disable(hidg->in_ep);
+	usb_ep_dequeue(hidg->in_ep, hidg->req);
+	kfree(hidg->req->buf);
+	usb_ep_free_request(hidg->in_ep, hidg->req);
+
+	usb_free_all_descriptors(f);
+
+	kfree(hidg->report_desc);
+	kfree(hidg);
+}
+
+/*-------------------------------------------------------------------------*/
+/*                                 Strings                                 */
+
+#define CT_FUNC_HID_IDX	0
+
+static struct usb_string ct_func_string_defs[] = {
+	[CT_FUNC_HID_IDX].s	= "HID Interface",
+	{},			/* end of list */
+};
+
+static struct usb_gadget_strings ct_func_string_table = {
+	.language	= 0x0409,	/* en-US */
+	.strings	= ct_func_string_defs,
+};
+
+static struct usb_gadget_strings *ct_func_strings[] = {
+	&ct_func_string_table,
+	NULL,
+};
+
+/*-------------------------------------------------------------------------*/
+/*                             usb_configuration                           */
+
+int __init hidg_bind_config(struct usb_configuration *c,
+			    struct hidg_func_descriptor *fdesc, int index)
+{
+	struct f_hidg *hidg;
+	int status;
+
+	if (index >= minors)
+		return -ENOENT;
+
+	/* maybe allocate device-global string IDs, and patch descriptors */
+	if (ct_func_string_defs[CT_FUNC_HID_IDX].id == 0) {
+		status = usb_string_id(c->cdev);
+		if (status < 0)
+			return status;
+		ct_func_string_defs[CT_FUNC_HID_IDX].id = status;
+		hidg_interface_desc.iInterface = status;
+	}
+
+	/* allocate and initialize one new instance */
+	hidg = kzalloc(sizeof *hidg, GFP_KERNEL);
+	if (!hidg)
+		return -ENOMEM;
+
+	hidg->minor = index;
+	hidg->bInterfaceSubClass = fdesc->subclass;
+	hidg->bInterfaceProtocol = fdesc->protocol;
+	hidg->report_length = fdesc->report_length;
+	hidg->report_desc_length = fdesc->report_desc_length;
+	hidg->report_desc = kmemdup(fdesc->report_desc,
+				    fdesc->report_desc_length,
+				    GFP_KERNEL);
+	if (!hidg->report_desc) {
+		kfree(hidg);
+		return -ENOMEM;
+	}
+
+	hidg->func.name    = "hid";
+	hidg->func.strings = ct_func_strings;
+	hidg->func.bind    = hidg_bind;
+	hidg->func.unbind  = hidg_unbind;
+	hidg->func.set_alt = hidg_set_alt;
+	hidg->func.disable = hidg_disable;
+	hidg->func.setup   = hidg_setup;
+
+	/* this could me made configurable at some point */
+	hidg->qlen	   = 4;
+
+	status = usb_add_function(c, &hidg->func);
+	if (status)
+		kfree(hidg);
+
+	return status;
+}
+
+int __init ghid_setup(struct usb_gadget *g, int count)
+{
+	int status;
+	dev_t dev;
+
+	hidg_class = class_create(THIS_MODULE, "hidg");
+
+	status = alloc_chrdev_region(&dev, 0, count, "hidg");
+	if (!status) {
+		major = MAJOR(dev);
+		minors = count;
+	}
+
+	return status;
+}
+
+void ghid_cleanup(void)
+{
+	if (major) {
+		unregister_chrdev_region(MKDEV(major, 0), minors);
+		major = minors = 0;
+	}
+
+	class_destroy(hidg_class);
+	hidg_class = NULL;
+}