这个代码调试，你首先要保证你的udc驱动没用问题，这个有些矛盾，应为我本来要用gadget驱动来调试udc驱动，结果反过来了。
这是在zero基础改的，大概的改动
1. 去掉loop。
2. sink的读写去掉了。
3. 增加了一个misc，通过fs去读写数据。
4. setup的特殊请求去掉了。
之前的文章已经把大部分的东西说完了，所以代码没有太多的注释。请结合之前的文章阅读。
我用了一个完成量，在没有数据时，读可能会死在那。这个可以优化一下，我就不做了。
还有就是主机是虚拟机的usb，linux-2.6.18（无耻的告诉你就是usb-skeleton驱动），gadget是板子的，linux-3.2.36
gadget_transfer.c //linux-3.2.36
/* #define VERBOSE_DEBUG */
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/utsname.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/miscdevice.h>
#include <linux/completion.h>
#include <linux/fs.h>
#include <asm/uaccess.h>
#define CONFIG_USB_GADGET_VBUS_DRAW 500
#include "composite.c"
#include "usbstring.c"
#include "config.c"
#include "epautoconf.c"
#define BUFLEN 4096
struct f_sourcesink {
struct usb_function function;
struct usb_ep *in_ep;
struct usb_ep *out_ep;
struct completion gdt_completion;
char data[BUFLEN];
unsigned actual;//数据实际长度
};
static inline struct f_sourcesink *func_to_ss(struct usb_function *f)
{
return container_of(f, struct f_sourcesink, function);
}
/*-------------------------------------------------------------------------*/
//接口描述符
static struct usb_interface_descriptor source_sink_intf = {
.bLength = sizeof source_sink_intf,
.bDescriptorType = USB_DT_INTERFACE,
.bNumEndpoints = 2,
.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
/* .iInterface = DYNAMIC */
};
/* full speed support: */
//全速设备端点描述符
static struct usb_endpoint_descriptor fs_source_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
};
static struct usb_endpoint_descriptor fs_sink_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
};
static struct usb_descriptor_header *fs_source_sink_descs[] = {
(struct usb_descriptor_header *) &source_sink_intf,
(struct usb_descriptor_header *) &fs_sink_desc,
(struct usb_descriptor_header *) &fs_source_desc,
NULL,
};
/* high speed support: */
//高速设备端点描述符
static struct usb_endpoint_descriptor hs_source_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = cpu_to_le16(512),
};
static struct usb_endpoint_descriptor hs_sink_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = cpu_to_le16(512),
};
static struct usb_descriptor_header *hs_source_sink_descs[] = {
(struct usb_descriptor_header *) &source_sink_intf,
(struct usb_descriptor_header *) &hs_source_desc,
(struct usb_descriptor_header *) &hs_sink_desc,
NULL,
};
/* function-specific strings: */
static struct usb_string strings_sourcesink[] = {
[0].s = "source and sink data",
{ } /* end of list */
};
static struct usb_gadget_strings stringtab_sourcesink = {
.language = 0x0409, /* en-us */
.strings = strings_sourcesink,
};
static struct usb_gadget_strings *sourcesink_strings[] = {
&stringtab_sourcesink,
NULL,
};
/*-------------------------------------------------------------------------*/
static const char longname[] = "Gadget gadget_transfer";
#define DRIVER_VENDOR_NUM 0x0ff0
#define DRIVER_PRODUCT_NUM 0x0ff0
/*-------------------------------------------------------------------------*/
//usb设备描述符
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_NUM),
.idProduct = cpu_to_le16(DRIVER_PRODUCT_NUM),
.bNumConfigurations = 2,
};
/* string IDs are assigned dynamically */
#define STRING_MANUFACTURER_IDX 0
#define STRING_PRODUCT_IDX 1
#define STRING_SERIAL_IDX 2
static char manufacturer[50];
/* default serial number takes at least two packets */
static char serial[] = "0123456789.0123456789.0123456789";
static struct usb_string strings_dev[] = {
[STRING_MANUFACTURER_IDX].s = manufacturer,
[STRING_PRODUCT_IDX].s = longname,
[STRING_SERIAL_IDX].s = serial,
{ } /* end of list */
};
static struct usb_gadget_strings stringtab_dev = {
.language = 0x0409, /* en-us */
.strings = strings_dev,
};
static struct usb_gadget_strings *dev_strings[] = {
&stringtab_dev,
NULL,
};
/*-------------------------------------------------------------------------*/
struct usb_request *alloc_ep_req(struct usb_ep *ep)
{
struct usb_request *req;
//看过之前udc的request，就知道这个就是个kzalloc
req = usb_ep_alloc_request(ep, GFP_ATOMIC);
if (req) {
req->length = BUFLEN;
req->buf = kmalloc(BUFLEN, GFP_ATOMIC);
if (!req->buf) {
usb_ep_free_request(ep, req);
req = NULL;
}
}
return req;
}
void free_ep_req(struct usb_ep *ep, struct usb_request *req)
{
kfree(req->buf);
usb_ep_free_request(ep, req);
}
static void disable_ep(struct usb_composite_dev *cdev, struct usb_ep *ep)
{
int value;
if (ep->driver_data) {
value = usb_ep_disable(ep);
ep->driver_data = NULL;
}
}
void disable_endpoints(struct usb_composite_dev *cdev,
struct usb_ep *in, struct usb_ep *out)
{
disable_ep(cdev, in);
disable_ep(cdev, out);
}
/*-------------------------------------------------------------------------*/
static int __init
sourcesink_bind(struct usb_configuration *c, struct usb_function *f)
{
struct usb_composite_dev *cdev = c->cdev;
struct f_sourcesink *ss = func_to_ss(f);
int id;
id = usb_interface_id(c, f);
if (id < 0)
return id;
source_sink_intf.bInterfaceNumber = id;
ss->in_ep = usb_ep_autoconfig(cdev->gadget, &fs_source_desc);
if (!ss->in_ep) {
autoconf_fail:
return -ENODEV;
}
ss->in_ep->driver_data = cdev; /* claim */
ss->out_ep = usb_ep_autoconfig(cdev->gadget, &fs_sink_desc);
if (!ss->out_ep)
goto autoconf_fail;
ss->out_ep->driver_data = cdev; /* claim */
/* support high speed hardware */
if (gadget_is_dualspeed(c->cdev->gadget)) {
hs_source_desc.bEndpointAddress =
fs_source_desc.bEndpointAddress;
hs_sink_desc.bEndpointAddress =
fs_sink_desc.bEndpointAddress;
f->hs_descriptors = hs_source_sink_descs;
}
return 0;
}
static void
sourcesink_unbind(struct usb_configuration *c, struct usb_function *f)
{
kfree(func_to_ss(f));
}
static void disable_source_sink(struct f_sourcesink *ss)
{
struct usb_composite_dev *cdev;
cdev = ss->function.config->cdev;
disable_endpoints(cdev, ss->in_ep, ss->out_ep);//就是disable了in和out
}
static int
enable_source_sink(struct usb_composite_dev *cdev, struct f_sourcesink *ss)
{
int result = 0;
struct usb_ep *ep;
/* one endpoint writes (sources) zeroes IN (to the host) */
ep = ss->in_ep;
result = config_ep_by_speed(cdev->gadget, &(ss->function), ep);
if (result)
return result;
result = usb_ep_enable(ep);
if (result < 0)
return result;
ep->driver_data = ss;
/* one endpoint reads (sinks) anything OUT (from the host) */
ep = ss->out_ep;
result = config_ep_by_speed(cdev->gadget, &(ss->function), ep);
if (result)
goto fail;
result = usb_ep_enable(ep);
if (result < 0)
goto fail;
ep->driver_data = ss;
return result;
fail:
ep = ss->in_ep;
usb_ep_disable(ep);
ep->driver_data = NULL;
return result;
}
static int sourcesink_set_alt(struct usb_function *f,
unsigned intf, unsigned alt)
{
struct f_sourcesink *ss = func_to_ss(f);
struct usb_composite_dev *cdev = f->config->cdev;
/* we know alt is zero */
if (ss->in_ep->driver_data)
disable_source_sink(ss);
return enable_source_sink(cdev, ss);
}
static void sourcesink_disable(struct usb_function *f)
{
struct f_sourcesink *ss = func_to_ss(f);
disable_source_sink(ss);
}
/*-------------------------------------------------------------------------*/
static struct f_sourcesink *ss;
static int __init sourcesink_bind_config(struct usb_configuration *c)
{
int status;
ss = kzalloc(sizeof *ss, GFP_KERNEL);
if (!ss)
return -ENOMEM;
init_completion(&ss->gdt_completion);
ss->function.name = "source/sink";
ss->function.descriptors = fs_source_sink_descs;
ss->function.bind = sourcesink_bind;
ss->function.unbind = sourcesink_unbind;
ss->function.set_alt = sourcesink_set_alt;
ss->function.disable = sourcesink_disable;
status = usb_add_function(c, &ss->function);
if (status)
kfree(ss);
return status;
}
static int sourcesink_setup(struct usb_configuration *c,
const struct usb_ctrlrequest *ctrl)
{
return 0;
}
static struct usb_configuration sourcesink_driver = {
.label = "source/sink",
.strings = sourcesink_strings,
.setup = sourcesink_setup,
.bConfigurationValue = 3,
.bmAttributes = USB_CONFIG_ATT_SELFPOWER,
/* .iConfiguration = DYNAMIC */
};
/**
* sourcesink_add - add a source/sink testing configuration to a device
* @cdev: the device to support the configuration
*/
static int __init sourcesink_add(struct usb_composite_dev *cdev)
{
int id;
/* allocate string ID(s) */
id = usb_string_id(cdev);
if (id < 0)
return id;
strings_sourcesink[0].id = id;
source_sink_intf.iInterface = id;
sourcesink_driver.iConfiguration = id;
return usb_add_config(cdev, &sourcesink_driver, sourcesink_bind_config);
}
struct gadget_misc
{
struct miscdevice miscdevp;
};
static void source_sink_complete(struct usb_ep *ep, struct usb_request *req)
{
int status = req->status;
switch (status) {
case 0: /* normal completion? */
case -ECONNABORTED: /* hardware forced ep reset */
case -ECONNRESET: /* request dequeued */
case -ESHUTDOWN: /* disconnect from host */
if (ep == ss->out_ep)
{
memset(ss->data, 0, BUFLEN);
memcpy(ss->data, req->buf, req->actual);
ss->actual = req->actual;
}
break;
case -EOVERFLOW:
default:
case -EREMOTEIO:
break;
}
//没有继续
free_ep_req(ep, req);
complete(&ss->gdt_completion);
}
static int gadget_transfer_open(struct inode *inode, struct file *filp)
{
return 0;
}
static ssize_t gadget_transfer_read(struct file *filp, char __user * buf, size_t count, loff_t * f_pos)
{
struct usb_request *req;
int ret;
req = alloc_ep_req(ss->out_ep);
if (!req)
{
ret = -ENOMEM;
goto fail;
}
req->complete = source_sink_complete;
ret = usb_ep_queue(ss->out_ep, req, GFP_ATOMIC);
if (ret) {
free_ep_req(ss->out_ep, req);
goto fail;
}
wait_for_completion(&ss->gdt_completion);
ss->actual = (count < ss->actual) ? count : ss->actual;
if (copy_to_user (buf, ss->data, ss->actual)) //拷贝读取的数据到用户空间
{
ret = -EFAULT;
goto fail;
}
return ss->actual;
fail:
return ret;
}
static ssize_t gadget_transfer_write(struct file *filp, const char __user * buf, size_t count, loff_t * f_pos)
{
struct usb_request *req;
int ret;
req = alloc_ep_req(ss->in_ep);
if (!req)
{
return -ENOMEM;
}
req->length = (count < BUFLEN) ? count : BUFLEN;
if (copy_from_user (req->buf, buf, req->length)) //拷贝读取的数据到用户空间
{
ret = -EFAULT;
goto fail;
}
req->complete = source_sink_complete;
ret = usb_ep_queue(ss->in_ep, req, GFP_ATOMIC);
if (ret)
{
goto fail;
}
wait_for_completion(&ss->gdt_completion);
return req->actual;
fail:
free_ep_req(ss->in_ep, req);
return ret;
}
static int gadget_transfer_release(struct inode *inode, struct file *filp)
{
return 0;
}
static struct file_operations gadget_transfer_fops = {
owner:THIS_MODULE,
open:gadget_transfer_open,
read:gadget_transfer_read,
write:gadget_transfer_write,
release:gadget_transfer_release,
};
static struct miscdevice gadget_transfer_misc = {
MISC_DYNAMIC_MINOR,
"gadget_transfer",
&gadget_transfer_fops,
};
/*-------------------------------------------------------------------------*/
static int __init gadget_transfer_bind(struct usb_composite_dev *cdev)
{
struct usb_gadget *gadget = cdev->gadget;
int id;
int ret = 0;
ret = misc_register(&gadget_transfer_misc);
if (ret)
{
goto fail_reg;
}
//各字符串描述符的引索
id = usb_string_id(cdev);//这个东西之前有说过，就是cdev->next_string_id++返回，怕id冲突
if (id < 0)
return id;
strings_dev[STRING_MANUFACTURER_IDX].id = id;
device_desc.iManufacturer = id;
id = usb_string_id(cdev);
if (id < 0)
return id;
strings_dev[STRING_PRODUCT_IDX].id = id;
device_desc.iProduct = id;
id = usb_string_id(cdev);
if (id < 0)
return id;
strings_dev[STRING_SERIAL_IDX].id = id;
device_desc.iSerialNumber = id;
sourcesink_add(cdev);
device_desc.bcdDevice = cpu_to_le16(0x0200 + 0x12);
snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
init_utsname()->sysname, init_utsname()->release,
gadget->name);
fail_reg:
return 0;
}
static int gadget_transfer_unbind(struct usb_composite_dev *cdev)
{
misc_deregister(&gadget_transfer_misc);
return 0;
}
static struct usb_composite_driver gadget_transfer_driver = {
.name = "gadget_transfer",
.dev = &device_desc,
.strings = dev_strings,
.max_speed = USB_SPEED_SUPER,
.unbind = gadget_transfer_unbind,
};
MODULE_LICENSE("GPL");
static int __init init(void)
{
return usb_composite_probe(&gadget_transfer_driver, gadget_transfer_bind);
}
module_init(init);
static void __exit cleanup(void)
{
usb_composite_unregister(&gadget_transfer_driver);
}
module_exit(cleanup);
usb-skeleton.c //linux-2.6.18 就改了
//#define USB_SKEL_VENDOR_ID 0x0ff0
//#define USB_SKEL_PRODUCT_ID 0x0ff0
/*
* USB Skeleton driver - 2.0
*
* Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.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, version 2.
*
* This driver is based on the 2.6.3 version of drivers/usb/usb-skeleton.c
* but has been rewritten to be easy to read and use, as no locks are now
* needed anymore.
*
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/kref.h>
#include <asm/uaccess.h>
#include <linux/usb.h>
/* Define these values to match your devices */
#define USB_SKEL_VENDOR_ID 0x0ff0
#define USB_SKEL_PRODUCT_ID 0x0ff0
/* table of devices that work with this driver */
static struct usb_device_id skel_table [] = {
{ USB_DEVICE(USB_SKEL_VENDOR_ID, USB_SKEL_PRODUCT_ID) },
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE (usb, skel_table);
/* Get a minor range for your devices from the usb maintainer */
#define USB_SKEL_MINOR_BASE 192
/* our private defines. if this grows any larger, use your own .h file */
#define MAX_TRANSFER ( PAGE_SIZE - 512 )
#define WRITES_IN_FLIGHT 8
/* Structure to hold all of our device specific stuff */
struct usb_skel {
struct usb_device * udev; /* the usb device for this device */
struct usb_interface * interface; /* the interface for this device */
struct semaphore limit_sem; /* limiting the number of writes in progress */
unsigned char * bulk_in_buffer; /* the buffer to receive data */
size_t bulk_in_size; /* the size of the receive buffer */
__u8 bulk_in_endpointAddr; /* the address of the bulk in endpoint */
__u8 bulk_out_endpointAddr; /* the address of the bulk out endpoint */
struct kref kref;
};
#define to_skel_dev(d) container_of(d, struct usb_skel, kref)
static struct usb_driver skel_driver;
static void skel_delete(struct kref *kref)
{
struct usb_skel *dev = to_skel_dev(kref);
usb_put_dev(dev->udev);
kfree (dev->bulk_in_buffer);
kfree (dev);
}
static int skel_open(struct inode *inode, struct file *file)
{
struct usb_skel *dev;
struct usb_interface *interface;
int subminor;
int retval = 0;
subminor = iminor(inode);
interface = usb_find_interface(&skel_driver, subminor);
if (!interface) {
err ("%s - error, can't find device for minor %d",
__FUNCTION__, subminor);
retval = -ENODEV;
goto exit;
}
dev = usb_get_intfdata(interface);
if (!dev) {
retval = -ENODEV;
goto exit;
}
/* increment our usage count for the device */
kref_get(&dev->kref);
/* save our object in the file's private structure */
file->private_data = dev;
exit:
return retval;
}
static int skel_release(struct inode *inode, struct file *file)
{
struct usb_skel *dev;
dev = (struct usb_skel *)file->private_data;
if (dev == NULL)
return -ENODEV;
/* decrement the count on our device */
kref_put(&dev->kref, skel_delete);
return 0;
}
static ssize_t skel_read(struct file *file, char *buffer, size_t count, loff_t *ppos)
{
struct usb_skel *dev;
int retval = 0;
int bytes_read;
dev = (struct usb_skel *)file->private_data;
/* do a blocking bulk read to get data from the device */
retval = usb_bulk_msg(dev->udev,
usb_rcvbulkpipe(dev->udev, dev->bulk_in_endpointAddr),
dev->bulk_in_buffer,
min(dev->bulk_in_size, count),
&bytes_read, 10000);
memset(buffer, 0, sizeof(buffer));
/* if the read was successful, copy the data to userspace */
if (!retval) {
if (copy_to_user(buffer, dev->bulk_in_buffer, bytes_read))
retval = -EFAULT;
else
retval = bytes_read;
}
return retval;
}
static void skel_write_bulk_callback(struct urb *urb, struct pt_regs *regs)
{
struct usb_skel *dev;
dev = (struct usb_skel *)urb->context;
/* sync/async unlink faults aren't errors */
if (urb->status &&
!(urb->status == -ENOENT ||
urb->status == -ECONNRESET ||
urb->status == -ESHUTDOWN)) {
dbg("%s - nonzero write bulk status received: %d",
__FUNCTION__, urb->status);
}
/* free up our allocated buffer */
usb_buffer_free(urb->dev, urb->transfer_buffer_length,
urb->transfer_buffer, urb->transfer_dma);
up(&dev->limit_sem);
}
static ssize_t skel_write(struct file *file, const char *user_buffer, size_t count, loff_t *ppos)
{
struct usb_skel *dev;
int retval = 0;
struct urb *urb = NULL;
char *buf = NULL;
size_t writesize = min(count, (size_t)MAX_TRANSFER);
dev = (struct usb_skel *)file->private_data;
/* verify that we actually have some data to write */
if (count == 0)
goto exit;
/* limit the number of URBs in flight to stop a user from using up all RAM */
if (down_interruptible(&dev->limit_sem)) {
retval = -ERESTARTSYS;
goto exit;
}
/* create a urb, and a buffer for it, and copy the data to the urb */
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb) {
retval = -ENOMEM;
goto error;
}
buf = usb_buffer_alloc(dev->udev, writesize, GFP_KERNEL, &urb->transfer_dma);
if (!buf) {
retval = -ENOMEM;
goto error;
}
if (copy_from_user(buf, user_buffer, writesize)) {
retval = -EFAULT;
goto error;
}
/* initialize the urb properly */
usb_fill_bulk_urb(urb, dev->udev,
usb_sndbulkpipe(dev->udev, dev->bulk_out_endpointAddr),
buf, writesize, skel_write_bulk_callback, dev);
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
/* send the data out the bulk port */
retval = usb_submit_urb(urb, GFP_KERNEL);
if (retval) {
err("%s - failed submitting write urb, error %d", __FUNCTION__, retval);
goto error;
}
/* release our reference to this urb, the USB core will eventually free it entirely */
usb_free_urb(urb);
exit:
return writesize;
error:
usb_buffer_free(dev->udev, writesize, buf, urb->transfer_dma);
usb_free_urb(urb);
up(&dev->limit_sem);
return retval;
}
static struct file_operations skel_fops = {
.owner = THIS_MODULE,
.read = skel_read,
.write = skel_write,
.open = skel_open,
.release = skel_release,
};
/*
* usb class driver info in order to get a minor number from the usb core,
* and to have the device registered with the driver core
*/
static struct usb_class_driver skel_class = {
.name = "skel%d",
.fops = &skel_fops,
.minor_base = USB_SKEL_MINOR_BASE,
};
static int skel_probe(struct usb_interface *interface, const struct usb_device_id *id)
{
struct usb_skel *dev = NULL;
struct usb_host_interface *iface_desc;
struct usb_endpoint_descriptor *endpoint;
size_t buffer_size;
int i;
int retval = -ENOMEM;
/* allocate memory for our device state and initialize it */
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (dev == NULL) {
err("Out of memory");
goto error;
}
kref_init(&dev->kref);
sema_init(&dev->limit_sem, WRITES_IN_FLIGHT);
dev->udev = usb_get_dev(interface_to_usbdev(interface));
dev->interface = interface;
/* set up the endpoint information */
/* use only the first bulk-in and bulk-out endpoints */
iface_desc = interface->cur_altsetting;
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
endpoint = &iface_desc->endpoint[i].desc;
if (!dev->bulk_in_endpointAddr &&
((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK)
== USB_DIR_IN) &&
((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
== USB_ENDPOINT_XFER_BULK)) {
/* we found a bulk in endpoint */
buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
dev->bulk_in_size = buffer_size;
dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
dev->bulk_in_buffer = kmalloc(buffer_size, GFP_KERNEL);
if (!dev->bulk_in_buffer) {
err("Could not allocate bulk_in_buffer");
goto error;
}
}
if (!dev->bulk_out_endpointAddr &&
((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK)
== USB_DIR_OUT) &&
((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
== USB_ENDPOINT_XFER_BULK)) {
/* we found a bulk out endpoint */
dev->bulk_out_endpointAddr = endpoint->bEndpointAddress;
}
}
if (!(dev->bulk_in_endpointAddr && dev->bulk_out_endpointAddr)) {
err("Could not find both bulk-in and bulk-out endpoints");
goto error;
}
/* save our data pointer in this interface device */
usb_set_intfdata(interface, dev);
/* we can register the device now, as it is ready */
retval = usb_register_dev(interface, &skel_class);
if (retval) {
/* something prevented us from registering this driver */
err("Not able to get a minor for this device.");
usb_set_intfdata(interface, NULL);
goto error;
}
/* let the user know what node this device is now attached to */
info("USB Skeleton device now attached to USBSkel-%d", interface->minor);
return 0;
error:
if (dev)
kref_put(&dev->kref, skel_delete);
return retval;
}
static void skel_disconnect(struct usb_interface *interface)
{
struct usb_skel *dev;
int minor = interface->minor;
/* prevent skel_open() from racing skel_disconnect() */
lock_kernel();
dev = usb_get_intfdata(interface);
usb_set_intfdata(interface, NULL);
/* give back our minor */
usb_deregister_dev(interface, &skel_class);
unlock_kernel();
/* decrement our usage count */
kref_put(&dev->kref, skel_delete);
info("USB Skeleton #%d now disconnected", minor);
}
static struct usb_driver skel_driver = {
.name = "skeleton",
.probe = skel_probe,
.disconnect = skel_disconnect,
.id_table = skel_table,
};
static int __init usb_skel_init(void)
{
int result;
/* register this driver with the USB subsystem */
result = usb_register(&skel_driver);
if (result)
err("usb_register failed. Error number %d", result);
return result;
}
static void __exit usb_skel_exit(void)
{
/* deregister this driver with the USB subsystem */
usb_deregister(&skel_driver);
}
module_init (usb_skel_init);
module_exit (usb_skel_exit);
MODULE_LICENSE("GPL");
调试
板子执行
有些答应打印是我加的，不要管，还有我的内核usb这块什么都没选，所以加载的多。
有gadget_transfer设备文件
Windows的提示
虚拟机有0ff0:0ff0 usddevice
在虚拟机装载
板子提示
虚拟机
有个skel0 设备文件
虚拟机执行
如果板子不动作，最后
现在执行cat /dev/skel0
板子执行
虚拟机
反过来
板子读，虚拟机写
当你拔去usb是你会发现/dev/skel0消失
基本就这样，下期会回到我的udc驱动上来，下期再见！