Hello.
Here is the source code for a portable data collector Argox PT-12
driver. It's been tested and is in production now. I see a point in
including this to kernel. SF project name - argox-pt (awaiting
registration confirmation). You could find this source code there in a
couple of days.
Any comments and suggestions are welcome.
---
/*
* USB CRD-10 driver - 1.0 for use with Argox PT-12.
*
* Copyright (C) 2006 Alexander Voronin ([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 program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* This driver is based on drivers/usb/usb-skeleton.c version 2.6.3
* but has been rewritten in terms of simplication, as no locks are
* 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 <asm/uaccess.h>
#include <linux/usb.h>
/* define vendor & device IDs */
#define USB_CRD_VENDOR_ID 0x1664
#define USB_CRD_PRODUCT_ID 0xd100
/* a list of devices that are supposed to work with this driver */
static struct usb_device_id crd_table [] = {
{ USB_DEVICE(USB_CRD_VENDOR_ID, USB_CRD_PRODUCT_ID) },
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE (usb, crd_table);
/* get a minor range for devices from usb maintainer */
#define USB_CRD_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 device-specific stuff */
struct usb_crd {
struct usb_device * udev; /* usb device for this device */
struct usb_interface * interface; /* interface for this device */
struct semaphore limit_sem; /* limiting the number of
writes in progress */
unsigned char * intr_in_buffer; /* buffer to receive data */
size_t intr_in_size; /* the size of the
receiving buffer */
__u8 intr_in_endpointAddr; /* the address of the int
in endpoint */
__u8 intr_out_endpointAddr; /* the address of the
int out endpoint */
struct kref kref;
};
#define to_crd_dev(d) container_of(d, struct usb_crd, kref)
static struct usb_driver crd_driver;
static void crd_delete(struct kref *kref)
{
struct usb_crd *dev = to_crd_dev(kref);
usb_put_dev(dev->udev);
kfree (dev->intr_in_buffer);
kfree (dev);
}
static int crd_open(struct inode *inode, struct file *file)
{
struct usb_crd *dev;
struct usb_interface *interface;
int subminor;
int retval = 0;
subminor = iminor(inode);
interface = usb_find_interface(&crd_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 usage count for device */
kref_get(&dev->kref);
/* save object in the file's private structure */
file->private_data = dev;
exit:
return retval;
}
static int crd_release(struct inode *inode, struct file *file)
{
struct usb_crd *dev;
dev = (struct usb_crd *)file->private_data;
if (dev == NULL)
return -ENODEV;
/* decrement the count on device */
kref_put(&dev->kref, crd_delete);
return 0;
}
static ssize_t crd_read(struct file *file, char *buffer, size_t count,
loff_t *ppos)
{
struct usb_crd *dev;
int retval = 0;
int bytes_read;
dev = (struct usb_crd *)file->private_data;
/* do a blocking bulk read to get data from the device */
retval = usb_bulk_msg(dev->udev,
usb_rcvintpipe(dev->udev, dev->intr_in_endpointAddr),
dev->intr_in_buffer,
min(dev->intr_in_size, count),
&bytes_read, 10000);
/* if successful, copy the data to userspace */
if (!retval) {
if (copy_to_user(buffer, dev->intr_in_buffer, bytes_read))
retval = -EFAULT;
else
retval = bytes_read;
}
return retval;
}
static void crd_write_intr_callback(struct urb *urb, struct pt_regs *regs)
{
struct usb_crd *dev;
dev = (struct usb_crd *)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 int status received: %d",
__FUNCTION__, urb->status);
}
/* dellocate buffer */
usb_buffer_free(urb->dev, urb->transfer_buffer_length,
urb->transfer_buffer, urb->transfer_dma);
up(&dev->limit_sem);
}
static ssize_t crd_write(struct file *file, const char *user_buffer,
size_t count, loff_t *ppos)
{
struct usb_crd *dev;
int retval = 0;
struct urb *urb = NULL;
char *buf = NULL;
size_t writesize = min(count, (size_t)MAX_TRANSFER);
dev = (struct usb_crd *)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 an urb and a buffer for it; copy all 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, writesize)) {
retval = -EFAULT;
goto error;
}
/* initialize urb properly */
usb_fill_int_urb(urb, dev->udev,
usb_sndintpipe(dev->udev, dev->intr_out_endpointAddr),
buf, writesize, crd_write_intr_callback, dev, 1);
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
/* send data out the int port */
retval = usb_submit_urb(urb, GFP_KERNEL);
if (retval) {
err("%s - failed submitting write urb, error %d", __FUNCTION__, retval);
goto error;
}
/* release 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 crd_fops = {
.owner = THIS_MODULE,
.read = crd_read,
.write = crd_write,
.open = crd_open,
.release = crd_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 crd_class = {
.name = "crd%d",
.fops = &crd_fops,
.minor_base = USB_CRD_MINOR_BASE,
};
static int crd_probe(struct usb_interface *interface, const struct
usb_device_id *id)
{
struct usb_crd *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 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 int-in and int-out endpoints */
iface_desc = interface->cur_altsetting;
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
endpoint = &iface_desc->endpoint[i].desc;
if (!dev->intr_in_endpointAddr &&
((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK)
== USB_DIR_IN) &&
((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
== USB_ENDPOINT_XFER_INT)) {
/* we found a int in endpoint */
buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
dev->intr_in_size = buffer_size;
dev->intr_in_endpointAddr = endpoint->bEndpointAddress;
dev->intr_in_buffer = kmalloc(buffer_size, GFP_KERNEL);
if (!dev->intr_in_buffer) {
err("Could not allocate int_in_buffer");
goto error;
}
}
if (!dev->intr_out_endpointAddr &&
((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK)
== USB_DIR_OUT) &&
((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
== USB_ENDPOINT_XFER_INT)) {
/* we found a int out endpoint */
dev->intr_out_endpointAddr = endpoint->bEndpointAddress;
}
}
if (!(dev->intr_in_endpointAddr && dev->intr_out_endpointAddr)) {
err("Could not find both int-in and int-out endpoints");
goto error;
}
/* save 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, &crd_class);
if (retval) {
/* something prevented 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 CRD-10 device now attached to USBCrd-%d", interface->minor);
return 0;
error:
if (dev)
kref_put(&dev->kref, crd_delete);
return retval;
}
static void crd_disconnect(struct usb_interface *interface)
{
struct usb_crd *dev;
int minor = interface->minor;
/* prevent crd_open() from racing crd_disconnect() */
lock_kernel();
dev = usb_get_intfdata(interface);
usb_set_intfdata(interface, NULL);
/* give back the minor */
usb_deregister_dev(interface, &crd_class);
unlock_kernel();
/* decrement usage count */
kref_put(&dev->kref, crd_delete);
info("USB CRD-10 #%d now disconnected", minor);
}
static struct usb_driver crd_driver = {
.name = "crd-10",
.probe = crd_probe,
.disconnect = crd_disconnect,
.id_table = crd_table,
};
static int __init usb_crd_init(void)
{
int result;
/* register this driver with USB subsystem */
result = usb_register(&crd_driver);
if (result)
err("usb_register failed. Error number %d", result);
return result;
}
static void __exit usb_crd_exit(void)
{
/* unregister this driver with USB subsystem */
usb_deregister(&crd_driver);
}
module_init (usb_crd_init);
module_exit (usb_crd_exit);
MODULE_LICENSE("GPL");
---
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