自娱自乐6之Linux gadget驱动5（自编gadget驱动，包涵与之通讯的主机usb驱动，已调试通过）

来源：互联网发布：人工智能最新进展编辑：程序博客网时间：2024/06/05 11:35

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 4096struct 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        2static 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 __initsourcesink_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 voidsourcesink_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 intenable_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