fps200 usb driver

/*
* USB Skeleton driver - 2.0
*
* Copyright (C) 2001-2004 Greg Kroah-Hartman ([e-mail])
*
*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 these values to match your devices */
#define USB_SKEL_VENDOR_ID0x61a
#define USB_SKEL_PRODUCT_ID0x200

#define fdbg(format, arg...) printk(KERN_DEBUG __FILE__ ": " format "/n" , ## arg)

/* 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_BASE192

/* 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_tbulk_in_size;/* the size of the receive buffer */
__u8bulk_in_endpointAddr;/* the address of the bulk in endpoint */
__u8bulk_out_endpointAddr;/* the address of the bulk out endpoint */
struct krefkref;
};
#define to_skel_dev(d) container_of(d, struct usb_skel, kref)

static struct usb_driver skel_driver;

static int fps200_usb_writeRegister(struct usb_device *usbdev,
int reg, unsigned char data){
int i;
i = usb_control_msg(usbdev, /* the device */
usb_sndctrlpipe(usbdev, 0), /* pipe */
0xc2,/* FPS200_USB_WRITE_REQUEST, request */
USB_TYPE_VENDOR | USB_DIR_OUT |
USB_RECIP_DEVICE,/* bmRequestType */
(data << 8) | reg, /* value */
0, /* index */
NULL,
0,
(100*HZ));
if(i<0)
{
fdbg("write register error!error code:%d,0x%x",i,i);
fdbg("/nENODEV = %d,0x%x",ENODEV, -ENODEV);
}

i = usb_control_msg(usbdev, /* the device */
usb_sndctrlpipe(usbdev, 128), /* pipe */
0xc2,/* FPS200_USB_WRITE_REQUEST, request */
USB_TYPE_VENDOR | USB_DIR_OUT |
USB_RECIP_DEVICE,/* bmRequestType */
(data << 8) | reg, /* value */
0, /* index */
NULL,
0,
(100*HZ));
if(i<0)
{
fdbg("write register error at Endpoint 128!error code:%d,0x%x",i,i);
}
else
{
fdbg("write register secceed at Endpoint 128!!");
}
i = usb_control_msg(usbdev, /* the device */
usb_sndctrlpipe(usbdev, 129), /* pipe */
0xc2,/* FPS200_USB_WRITE_REQUEST, request */
USB_TYPE_VENDOR | USB_DIR_OUT |
USB_RECIP_DEVICE,/* bmRequestType */
(data << 8) | reg, /* value */
0, /* index */
NULL,
0,
(100*HZ));
if(i<0)
{
fdbg("write register error at Endpoint 129!error code:%d,0x%x",i,i);
}
else
{
fdbg("write register secceed at Endpoint 129!!");

}

return i;

}

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 __user *buffer, size_t count, loff_t *ppos)
{
struct usb_skel *dev;
int retval = 0;

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*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;
}

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;
struct urb *urb = NULL;
char *buf = NULL;

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;
}

/* 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/skel%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;

int errorcode;

/* 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;

fdbg("Now usbdev = %x/n", dev->udev);

/* set up the endpoint information */
/* use only the first bulk-in and bulk-out endpoints */
iface_desc = interface->cur_altsetting;

fdbg("There are %d Endpoints in the interface/n", iface_desc->desc.bNumEndpoints);

for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i)
{
endpoint = &iface_desc->endpoint[i].desc;

fdbg("endpoint %d bmAttributes: 0x%x/n", i, endpoint->bmAttributes);

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 */
fdbg("We find an bulk in Endpoint at %d", endpoint->bEndpointAddress);
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("Could not allocate bulk_in_buffer");
goto error;
}
}

if((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
== USB_ENDPOINT_XFER_CONTROL)
{
fdbg("We find an control Endpoint at %d", endpoint->bEndpointAddress);
}

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 */
fdbg("We find an bulk in Endpoint at %d", endpoint->bEndpointAddress);
dev->bulk_out_endpointAddr = endpoint->bEndpointAddress;
}
}

/* 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);
errorcode = fps200_usb_writeRegister(dev->udev, 0x06, 10);
if (errorcode < 0)
{
fdbg("write register erro code:%d", errorcode);
}
fdbg("usb device state: %d", dev->udev->state);

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 = {
.owner = THIS_MODULE,
.name = "skeleton",
.id_table = skel_table,
.probe = skel_probe,
.disconnect = skel_disconnect,
};

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");