Hi, *
The steps I debug my DT3500(USB Smart Card) driver on kernel 2.6.11.
Source code of DT3500.c is attached in the end of this post. And I am
eager to know how to debug usb_submit_urb funcation call. Thanks in
advanced.
Some device files should be created first in order to use the new
kernel module. They include the following command:
mkdir /dev/usb 2>/dev/null
mknod /dev/usb/DT35000 c 180 160 2>/dev/null
chmod 777 /dev/usb/DT35000
Now when I plug DT3500 USB smart card into the slot and insert the new
kernel module using "insmod DT3500.ko", I can get the following
message:
USB DT3500 usb_skel_init
skel_probe
bulk_in_endpointAddr is 130
dev-bulk_out_endpointAddr is 130
endpoint->bEndpointAddress is 130
endpoint->bmAttributes is 2
bulk_out_endpointAddr is 130
USB DT3500 device now attached to DT3500 - 160
After I use "rmod DT3500", the os will display the following message:
USB DT3500 usb_skel_exit
skel_disconnect
skel_delete
But the most important part of the DT3500 driver is the skel_write
function which performs the write functionality. At this moment, it's
buggy. :(
I hope that I can get some help from others.
When using my DT3500 driver with pcsc-lite, the initial check fail on
DT3500 reader.
I have added some debug information in skel_write to watch some value
of the variable.
The following messages are display:
skel_open
skel_write
8
4
-64
5
22
0
buf 4
-64
5
22
0
skel_write - failed submitting write urb, error -90
error code 90 means EMSGSIZE in Linux. user_buffer is a four-element
array [-64, 5, 22, 0]. I read the source code of the usb
implementation in kernel 2.6.11 and find that
in 3 cases there will be EMSGSIZE. I try to track it down. Any other
help is highly appreciated.
=========DT3500 Source Code ==============
/*
* USB Skeleton driver - 2.0
*
* Copyright (C) 2001-2004 Greg Kroah-Hartman ([EMAIL PROTECTED])
*
* 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/config.h>
#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 <linux/smp_lock.h>
#include <linux/usb.h>
#include <asm/uaccess.h>
#define DRIVER_VERSION "V2.1"
#define DRIVER_AUTHOR "TowerGee, [EMAIL PROTECTED]"
#define DRIVER_DESC "USB DT3500 Driver"
//MODULE_PARM(debug, "i");
//MODULE_PARM_DESC(debug, "Debug enabled or not");
/* Define these values to match your devices */
#define USB_SKEL_VENDOR_ID 0x0802
#define USB_SKEL_PRODUCT_ID 0x2800
/* 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 160
/* 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 */
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 */
unsigned char * bulk_out_buffer; /* the buffer to send
date, Added
by TowerGee */
size_t bulk_out_size; /* the size of the send
buffer, Added by TowerGee */
struct urb * write_urb; /* the urb used to send
date, Added by TowerGee */
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);
err("skel_delete");
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);
// Added by TowerGee
err("skel_open");
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;
// Added by TowerGee
err("skel_release");
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 __user *buffer,
size_t count, loff_t *ppos)
{
struct usb_skel *dev;
int retval = 0;
// Added by TowerGee
err("skel_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),
&count, HZ*60);
/* if the read was successful, copy the data to userspace */
if (!retval) {
if (copy_to_user(buffer, dev->bulk_in_buffer, count))
retval = -EFAULT;
else
retval = count;
}
return retval;
}
static void skel_write_bulk_callback(struct urb *urb, struct pt_regs *regs)
{
/* 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);
}
static ssize_t skel_write(struct file *file, const char __user
*user_buffer, size_t count, loff_t *ppos)
{
struct usb_skel *dev;
int retval = 0;
int iii = 0;
struct urb *urb = NULL;
char *buf = NULL;
// Added by TowerGee
err("skel_write");
err("%d", count);
err("%d", sizeof(user_buffer));
for (iii=0; iii<sizeof(user_buffer); iii++)
err("%d", user_buffer[iii]);
dev = (struct usb_skel *)file->private_data;
/* verify that we actually have some data to write */
if (count == 0)
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, count, GFP_KERNEL,
&urb->transfer_dma);
if (!buf) {
retval = -ENOMEM;
goto error;
}
if (copy_from_user(buf, user_buffer, count)) {
retval = -EFAULT;
goto error;
}
//err("user_buffer %d", sizeof(user_buffer));
//for (iii=0; iii<sizeof(user_buffer); iii++)
// err("%d", user_buffer[iii]);
err("buf %d", sizeof(buf));
for (iii=0; iii<sizeof(buf); iii++)
err("%d", buf[iii]);
/* initialize the urb properly */
usb_fill_bulk_urb(urb, dev->udev,
usb_sndbulkpipe(dev->udev,
dev->bulk_out_endpointAddr),
buf, count, 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 count;
error:
usb_buffer_free(dev->udev, count, buf, urb->transfer_dma);
usb_free_urb(urb);
//kfree(buf);
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 devfs and the driver core
*/
static struct usb_class_driver skel_class = {
.name = "usb/dt3500%d",
.fops = &skel_fops,
.mode = S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH,
.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;
// Added by TowerGee
err("skel_probe");
/* allocate memory for our device state and initialize it */
dev = kmalloc(sizeof(struct usb_skel), GFP_KERNEL);
if (dev == NULL) {
err("Out of memory");
goto error;
}
memset(dev, 0x00, sizeof (*dev));
kref_init(&dev->kref);
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_DIR_IN) &&
((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
== USB_ENDPOINT_XFER_BULK)) {
/* we found a bulk in endpoint */
buffer_size = endpoint->wMaxPacketSize;
dev->bulk_in_size = buffer_size;
dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
err("bulk_in_endpointAddr is %d",
dev->bulk_in_endpointAddr);
dev->bulk_in_buffer = kmalloc(buffer_size, GFP_KERNEL);
if (!dev->bulk_in_buffer) {
err("Could not allocate bulk_in_buffer");
goto error;
}
}
// Added by TowerGee
// allocate a bulk out endpoint
dev->write_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!dev->write_urb) {
err("No free urbs available");
goto error;
}
buffer_size = endpoint->wMaxPacketSize;
dev->bulk_out_size = buffer_size;
dev->bulk_out_endpointAddr = endpoint->bEndpointAddress;
dev->bulk_out_buffer = kmalloc (buffer_size, GFP_KERNEL);
if (!dev->bulk_out_buffer) {
err("Couldn't allocate bulk_out_buffer");
goto error;
}
usb_fill_bulk_urb(dev->write_urb, dev->udev,
usb_sndbulkpipe(dev->udev, endpoint->bEndpointAddress),
dev->bulk_out_buffer, buffer_size,
skel_write_bulk_callback, dev);
info("allocate bulk_out_buffer");
err("dev->bulk_out_endpointAddr is %d",
dev->bulk_out_endpointAddr);
err("endpoint->bEndpointAddress is %d",
endpoint->bEndpointAddress);
err("endpoint->bmAttributes is %d", endpoint->bmAttributes);
/*
if (!dev->bulk_out_endpointAddr &&
!(endpoint->bEndpointAddress & USB_DIR_IN) &&
((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
== USB_ENDPOINT_XFER_BULK)) {
// we found a bulk out endpoint /
dev->bulk_out_endpointAddr = endpoint->bEndpointAddress;
err("bEndpointAddress is %d",
endpoint->bEndpointAddress);
}
*/
err("bulk_out_endpointAddr is %d", dev->bulk_out_endpointAddr);
}
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 */
err("USB DT3500 device now attached to DT3500 - %d", interface->minor);
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;
// Added by TowerGee
err("skel_disconnect");
/* 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 DT3500 #%d now disconnected", minor);
}
static struct usb_driver skel_driver = {
.owner = THIS_MODULE,
.name = "DT3500",
.id_table = skel_table,
.probe = skel_probe,
.disconnect = skel_disconnect,
};
static int __init usb_skel_init(void)
{
int result;
err("USB DT3500 usb_skel_init");
/* 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 */
err("USB DT3500 usb_skel_exit");
usb_deregister(&skel_driver);
}
module_init (usb_skel_init);
module_exit (usb_skel_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
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