>
> What USB drivers/modules are loaded when this happens?
usb-uhci 24452 0 (unused)
usbcore 71552 1 [usb-skeleton usb-uhci]
> Have you modified the usb-skeleton.c driver source code?
> If so, how? Post it?
The differences are mostly that I changed the vendor and product ID
and I've been trying to communicate with the device in the probe function,
without much success yet....smsc does not release their
detailed specification for the device--so you can see the frustration in
the code.
> How about testing loading/unloading the driver without the device
> attached?
I'll try this.
>
> See if this has any effect (probably won't):
> In usb-skeleton.c, change
> #define USB_SKEL_MINOR_BASE 200
> to
> #define USB_SKEL_MINOR_BASE 192
Changing the USB_SKEL_MINOR_BASE numbers does fix the problem.
Regards,
Jeff
_____________________________________________________
Jeffrey McDonald, University of Pittsburgh [EMAIL PROTECTED]
100 Allen Hall office: 412-624-9056
3941 O'Hara St. lab: 412-624-9160
Dept. of Physics and Astronomy fax: 412-624-9163
University of Pittsburgh
Pittsburgh, PA 15260
/*
* USB Skeleton driver - 0.7
*
* Copyright (c) 2001 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; either version 2 of
* the License, or (at your option) any later version.
*
*
* This driver is to be used as a skeleton driver to be able to create a
* USB driver quickly. The design of it is based on the usb-serial and
* dc2xx drivers.
*
* Thanks to Oliver Neukum and David Brownell for their help in debugging
* this driver.
*
* TODO:
* - fix urb->status race condition in write sequence
* - move minor_table to a dynamic list.
*
* History:
*
* 2002_02_12 - 0.7 - zero out dev in probe function for devices that do
* not have both a bulk in and bulk out endpoint.
* Thanks to Holger Waechtler for the fix.
* 2001_11_05 - 0.6 - fix minor locking problem in skel_disconnect.
* Thanks to Pete Zaitcev for the fix.
* 2001_09_04 - 0.5 - fix devfs bug in skel_disconnect. Thanks to wim delvaux
* 2001_08_21 - 0.4 - more small bug fixes.
* 2001_05_29 - 0.3 - more bug fixes based on review from linux-usb-devel
* 2001_05_24 - 0.2 - bug fixes based on review from linux-usb-devel people
* 2001_05_01 - 0.1 - first version
*
*/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/errno.h>
#include <linux/poll.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/fcntl.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/smp_lock.h>
#include <linux/devfs_fs_kernel.h>
#include <linux/usb.h>
#ifdef CONFIG_USB_DEBUG
static int debug = 1;
#else
static int debug;
#endif
/* Use our own dbg macro */
#undef dbg
#define dbg(format, arg...) do { if (debug) printk(KERN_DEBUG __FILE__ ": " format
"\n" , ## arg); } while (0)
/* Version Information */
#define DRIVER_VERSION "v0.4"
#define DRIVER_AUTHOR "Greg Kroah-Hartman, [EMAIL PROTECTED]"
#define DRIVER_DESC "USB Skeleton Driver"
/* Module paramaters */
MODULE_PARM(debug, "i");
MODULE_PARM_DESC(debug, "Debug enabled or not");
/* Define these values to match your device */
#define USB_SMSC_VENDOR_ID 0x0424
#define USB_SMSC_PRODUCT_ID 0x0dad
/* table of devices that work with this driver */
static struct usb_device_id skel_table [] = {
{ USB_DEVICE(USB_SMSC_VENDOR_ID, USB_SMSC_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
/* we can have up to this number of device plugged in at once */
#define MAX_DEVICES 16
/* Structure to hold all of our device specific stuff */
struct usb_skel {
struct usb_device * udev; /* save off the usb device pointer */
struct usb_interface * interface; /* the interface for this
device */
devfs_handle_t devfs; /* devfs device node */
unsigned char minor; /* the starting minor number
for this device */
unsigned char num_ports; /* the number of ports this
device has */
char num_interrupt_in; /* number of interrupt in
endpoints we have */
char num_bulk_in; /* number of bulk in endpoints
we have */
char num_bulk_out; /* number of bulk out
endpoints we have */
unsigned char * bulk_in_buffer; /* the buffer to receive data
*/
int bulk_in_size; /* the size of the receive buffer */
__u8 bulk_in_endpointAddr; /* the address of the bulk in
endpoint */
unsigned char * bulk_out_buffer; /* the buffer to send data */
int bulk_out_size; /* the size of the send buffer */
struct urb * write_urb; /* the urb used to send data
*/
__u8 bulk_out_endpointAddr; /* the address of the bulk out
endpoint */
struct tq_struct tqueue; /* task queue for line discipline
waking up */
int open_count; /* number of times this port has been
opened */
struct semaphore sem; /* locks this structure */
};
/* the global usb devfs handle */
extern devfs_handle_t usb_devfs_handle;
/* local function prototypes */
static ssize_t skel_read (struct file *file, char *buffer, size_t count, loff_t
*ppos);
static ssize_t skel_write (struct file *file, const char *buffer, size_t count,
loff_t *ppos);
static int skel_ioctl (struct inode *inode, struct file *file, unsigned int
cmd, unsigned long arg);
static int skel_open (struct inode *inode, struct file *file);
static int skel_release (struct inode *inode, struct file *file);
static void * skel_probe (struct usb_device *dev, unsigned int ifnum, const
struct usb_device_id *id);
static void skel_disconnect (struct usb_device *dev, void *ptr);
static void skel_write_bulk_callback (struct urb *urb);
/* array of pointers to our devices that are currently connected */
static struct usb_skel *minor_table[MAX_DEVICES];
/* lock to protect the minor_table structure */
static DECLARE_MUTEX (minor_table_mutex);
/*
* File operations needed when we register this driver.
* This assumes that this driver NEEDS file operations,
* of course, which means that the driver is expected
* to have a node in the /dev directory. If the USB
* device were for a network interface then the driver
* would use "struct net_driver" instead, and a serial
* device would use "struct tty_driver".
*/
static struct file_operations skel_fops = {
/*
* The owner field is part of the module-locking
* mechanism. The idea is that the kernel knows
* which module to increment the use-counter of
* BEFORE it calls the device's open() function.
* This also means that the kernel can decrement
* the use-counter again before calling release()
* or should the open() function fail.
*
* Not all device structures have an "owner" field
* yet. "struct file_operations" and "struct net_device"
* do, while "struct tty_driver" does not. If the struct
* has an "owner" field, then initialize it to the value
* THIS_MODULE and the kernel will handle all module
* locking for you automatically. Otherwise, you must
* increment the use-counter in the open() function
* and decrement it again in the release() function
* yourself.
*/
owner: THIS_MODULE,
read: skel_read,
write: skel_write,
ioctl: skel_ioctl,
open: skel_open,
release: skel_release,
};
/* usb specific object needed to register this driver with the usb subsystem */
static struct usb_driver skel_driver = {
name: "skeleton",
probe: skel_probe,
disconnect: skel_disconnect,
fops: &skel_fops,
minor: USB_SKEL_MINOR_BASE,
id_table: skel_table,
};
/**
* usb_skel_debug_data
*/
static inline void usb_skel_debug_data (const char *function, int size, const unsigned
char *data)
{
int i;
if (!debug)
return;
printk (KERN_DEBUG __FILE__": %s - length = %d, data = ",
function, size);
for (i = 0; i < size; ++i) {
printk ("%.2x ", data[i]);
}
printk ("\n");
}
/**
* skel_delete
*/
static inline void skel_delete (struct usb_skel *dev)
{
minor_table[dev->minor] = NULL;
if (dev->bulk_in_buffer != NULL)
kfree (dev->bulk_in_buffer);
if (dev->bulk_out_buffer != NULL)
kfree (dev->bulk_out_buffer);
if (dev->write_urb != NULL)
usb_free_urb (dev->write_urb);
kfree (dev);
}
/**
* skel_open
*/
static int skel_open (struct inode *inode, struct file *file)
{
struct usb_skel *dev = NULL;
int subminor;
int retval = 0;
dbg(__FUNCTION__);
subminor = MINOR (inode->i_rdev) - USB_SKEL_MINOR_BASE;
if ((subminor < 0) ||
(subminor >= MAX_DEVICES)) {
return -ENODEV;
}
/* Increment our usage count for the module.
* This is redundant here, because "struct file_operations"
* has an "owner" field. This line is included here soley as
* a reference for drivers using lesser structures... ;-)
*/
MOD_INC_USE_COUNT;
/* lock our minor table and get our local data for this minor */
down (&minor_table_mutex);
dev = minor_table[subminor];
if (dev == NULL) {
up (&minor_table_mutex);
MOD_DEC_USE_COUNT;
return -ENODEV;
}
/* lock this device */
down (&dev->sem);
/* unlock the minor table */
up (&minor_table_mutex);
/* increment our usage count for the driver */
++dev->open_count;
/* save our object in the file's private structure */
file->private_data = dev;
/* unlock this device */
up (&dev->sem);
return retval;
}
/**
* skel_release
*/
static int skel_release (struct inode *inode, struct file *file)
{
struct usb_skel *dev;
int retval = 0;
dev = (struct usb_skel *)file->private_data;
if (dev == NULL) {
dbg (__FUNCTION__ " - object is NULL");
return -ENODEV;
}
dbg(__FUNCTION__ " - minor %d", dev->minor);
/* lock our minor table */
down (&minor_table_mutex);
/* lock our device */
down (&dev->sem);
if (dev->open_count <= 0) {
dbg (__FUNCTION__ " - device not opened");
retval = -ENODEV;
goto exit_not_opened;
}
if (dev->udev == NULL) {
/* the device was unplugged before the file was released */
up (&dev->sem);
skel_delete (dev);
up (&minor_table_mutex);
MOD_DEC_USE_COUNT;
return 0;
}
/* decrement our usage count for the device */
--dev->open_count;
if (dev->open_count <= 0) {
/* shutdown any bulk writes that might be going on */
usb_unlink_urb (dev->write_urb);
dev->open_count = 0;
}
/* decrement our usage count for the module */
MOD_DEC_USE_COUNT;
exit_not_opened:
up (&dev->sem);
up (&minor_table_mutex);
return retval;
}
/**
* skel_read
*/
static ssize_t skel_read (struct file *file, char *buffer, size_t count, loff_t *ppos)
{
struct usb_skel *dev;
int retval = 0;
dev = (struct usb_skel *)file->private_data;
dbg(__FUNCTION__ " - minor %d, count = %d", dev->minor, count);
/* lock this object */
down (&dev->sem);
/* verify that the device wasn't unplugged */
if (dev->udev == NULL) {
up (&dev->sem);
return -ENODEV;
}
/* do an immediate 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, dev->bulk_in_size,
&count, HZ*10);
/* 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;
}
/* unlock the device */
up (&dev->sem);
return retval;
}
/**
* skel_write
*/
static ssize_t skel_write (struct file *file, const char *buffer, size_t count, loff_t
*ppos)
{
struct usb_skel *dev;
ssize_t bytes_written = 0;
int retval = 0;
dev = (struct usb_skel *)file->private_data;
dbg(__FUNCTION__ " - minor %d, count = %d", dev->minor, count);
/* lock this object */
down (&dev->sem);
/* verify that the device wasn't unplugged */
if (dev->udev == NULL) {
retval = -ENODEV;
goto exit;
}
/* verify that we actually have some data to write */
if (count == 0) {
dbg(__FUNCTION__ " - write request of 0 bytes");
goto exit;
}
/* see if we are already in the middle of a write */
if (dev->write_urb->status == -EINPROGRESS) {
dbg (__FUNCTION__ " - already writing");
goto exit;
}
/* we can only write as much as 1 urb will hold */
bytes_written = (count > dev->bulk_out_size) ?
dev->bulk_out_size : count;
/* copy the data from userspace into our urb */
if (copy_from_user(dev->write_urb->transfer_buffer, buffer,
bytes_written)) {
retval = -EFAULT;
goto exit;
}
usb_skel_debug_data (__FUNCTION__, bytes_written,
dev->write_urb->transfer_buffer);
/* set up our urb */
FILL_BULK_URB(dev->write_urb, dev->udev,
usb_sndbulkpipe(dev->udev, dev->bulk_out_endpointAddr),
dev->write_urb->transfer_buffer, bytes_written,
skel_write_bulk_callback, dev);
/* send the data out the bulk port */
retval = usb_submit_urb(dev->write_urb);
if (retval) {
err(__FUNCTION__ " - failed submitting write urb, error %d",
retval);
} else {
retval = bytes_written;
}
exit:
/* unlock the device */
up (&dev->sem);
return retval;
}
/**
* skel_ioctl
*/
static int skel_ioctl (struct inode *inode, struct file *file, unsigned int cmd,
unsigned long arg)
{
struct usb_skel *dev;
dev = (struct usb_skel *)file->private_data;
/* lock this object */
down (&dev->sem);
/* verify that the device wasn't unplugged */
if (dev->udev == NULL) {
up (&dev->sem);
return -ENODEV;
}
dbg(__FUNCTION__ " - minor %d, cmd 0x%.4x, arg %ld",
dev->minor, cmd, arg);
/* fill in your device specific stuff here */
/* unlock the device */
up (&dev->sem);
/* return that we did not understand this ioctl call */
return -ENOTTY;
}
/**
* skel_write_bulk_callback
*/
static void skel_write_bulk_callback (struct urb *urb)
{
struct usb_skel *dev = (struct usb_skel *)urb->context;
int i;
info("urb callback called");
dbg(__FUNCTION__ " - minor %d", dev->minor);
if ((urb->status != -ENOENT) &&
(urb->status != -ECONNRESET)) {
dbg(__FUNCTION__ " - nonzero write bulk status received: %d",
urb->status);
return;
}
for (i=0;i<dev->bulk_out_size;i++) {
info ("bulk data: %d %02x\n", i, *(dev->bulk_out_buffer+i));
}
return;
}
/**
* skel_probe
*
* Called by the usb core when a new device is connected that it thinks
* this driver might be interested in.
*/
static void * skel_probe(struct usb_device *udev, unsigned int ifnum, const struct
usb_device_id *id)
{
struct usb_skel *dev = NULL;
struct usb_interface *interface;
struct usb_interface_descriptor *iface_desc;
struct usb_endpoint_descriptor *endpoint;
int minor;
int buffer_size;
int i;
char buf[128];
unsigned long lstatus;
char name[10];
int retval=0,count=0,bytes_written=0;
info ("USBSkeleton USB device %d (vend/prod 0x%x/0x%x)",
udev->devnum,udev->descriptor.idVendor,udev->descriptor.idProduct);
/* See if the device offered us matches what we can accept */
if ((udev->descriptor.idVendor != USB_SMSC_VENDOR_ID) ||
(udev->descriptor.idProduct != USB_SMSC_PRODUCT_ID)) {
return NULL;
}
/* select a "subminor" number (part of a minor number) */
down (&minor_table_mutex);
for (minor = 0; minor < MAX_DEVICES; ++minor) {
if (minor_table[minor] == NULL)
break;
}
if (minor >= MAX_DEVICES) {
info ("Too many devices plugged in, can not handle this device.");
goto exit;
}
/* allocate memory for our device state and intialize it */
dev = kmalloc (sizeof(struct usb_skel), GFP_KERNEL);
if (dev == NULL) {
err ("Out of memory");
goto exit;
}
memset (dev, 0x00, sizeof (*dev));
minor_table[minor] = dev;
interface = &udev->actconfig->interface[ifnum];
init_MUTEX (&dev->sem);
dev->udev = udev;
dev->interface = interface;
dev->minor = minor;
/* set up the endpoint information */
/* check out the endpoints */
iface_desc = &interface->altsetting[0];
for (i = 0; i < iface_desc->bNumEndpoints; ++i) {
endpoint = &iface_desc->endpoint[i];
info ("endpoint: %04x, %04x", endpoint->bEndpointAddress,
endpoint->bmAttributes);
if ((endpoint->bEndpointAddress & 0x80) &&
((endpoint->bmAttributes & 3) == 0x02)) {
/* we found a bulk in endpoint */
buffer_size = 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("Couldn't allocate bulk_in_buffer");
goto error;
}
}
if (((endpoint->bEndpointAddress & 0x80) == 0x00) &&
((endpoint->bmAttributes & 3) == 0x02)) {
/* we found a bulk out endpoint */
dev->write_urb = usb_alloc_urb(0);
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;
}
FILL_BULK_URB(dev->write_urb, udev,
usb_sndbulkpipe(udev,
endpoint->bEndpointAddress),
dev->bulk_out_buffer, buffer_size,
skel_write_bulk_callback, dev);
}
}
/* initialize the devfs node for this device and register it */
sprintf(name, "skel%d", dev->minor);
dev->devfs = devfs_register (usb_devfs_handle, name,
DEVFS_FL_DEFAULT, USB_MAJOR,
USB_SKEL_MINOR_BASE + dev->minor,
S_IFCHR | S_IRUSR | S_IWUSR |
S_IRGRP | S_IWGRP | S_IROTH,
&skel_fops, NULL);
// int usb_get_status(struct usb_device *dev, int type, int target, void
*data)
lstatus =0;
retval = usb_string(dev->udev, dev->udev->descriptor.iProduct, buf, 128);
//
info ("USB Skeleton string %s %d", buf,retval);
retval = usb_string(dev->udev, dev->udev->descriptor.iManufacturer, buf, 128);
info ("USB Skeleton string %s %d", buf,retval);
*dev->bulk_out_buffer = (char) 0x00;
*(dev->bulk_out_buffer+1) = (char) 0x10;
*(dev->bulk_out_buffer+2) = (char) 0x00;
*(dev->bulk_out_buffer+3) = (char) 0x10;
*(dev->bulk_out_buffer+4) = (char) 0x00;
*(dev->bulk_out_buffer+5) = (char) 0x10;
bytes_written = 6;
FILL_BULK_URB(dev->write_urb, dev->udev,
usb_sndbulkpipe(dev->udev,
dev->bulk_in_endpointAddr),
dev->bulk_out_buffer,bytes_written,
skel_write_bulk_callback, dev);
retval = usb_submit_urb(dev->write_urb);
/* info ("bulk data: %d %d\n", retval, dev->bulk_out_size);
FILL_BULK_URB(dev->write_urb, dev->udev,
usb_rcvbulkpipe(dev->udev,
dev->bulk_out_endpointAddr),
dev->bulk_out_buffer,dev->bulk_out_size,
skel_write_bulk_callback, dev);
retval = usb_submit_urb(dev->write_urb);
info ("bulk data: %d %d\n", retval, dev->bulk_out_size);
*/
goto exit;
error:
skel_delete (dev);
dev = NULL;
exit:
up (&minor_table_mutex);
return dev;
}
/**
* skel_disconnect
*
* Called by the usb core when the device is removed from the system.
*/
static void skel_disconnect(struct usb_device *udev, void *ptr)
{
struct usb_skel *dev;
int minor;
dev = (struct usb_skel *)ptr;
down (&minor_table_mutex);
down (&dev->sem);
minor = dev->minor;
/* remove our devfs node */
devfs_unregister(dev->devfs);
/* if the device is not opened, then we clean up right now */
if (!dev->open_count) {
up (&dev->sem);
skel_delete (dev);
} else {
dev->udev = NULL;
up (&dev->sem);
}
info("USB Skeleton #%d now disconnected", minor);
up (&minor_table_mutex);
}
/**
* usb_skel_init
*/
static int __init usb_skel_init(void)
{
int result;
/* register this driver with the USB subsystem */
result = usb_register(&skel_driver);
if (result < 0) {
err("usb_register failed for the "__FILE__" driver. Error number %d",
result);
return -1;
}
info(DRIVER_DESC " " DRIVER_VERSION);
return 0;
}
/**
* usb_skel_exit
*/
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_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
