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tmsi.c
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tmsi.c
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/*
* tmsi.c: USB driver for the TMS International Fiber to USB converter
* used in the Refa8 series of products.
*
* Copyright (C) 2008 Clinical Science Systems (http://www.clinicalsciencesystems.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 3.
*
*
* ChangeLog
* ---------
*
* v1.8 - 02-12-2014 Maciej Pawlisz
*
* * Stabilization of SYNFI device
*
* v1.8 - 13-01-2013 Maciej Pawlisz
*
* * err() replaced by pr_err()
*
* v1.7 - 02-06-2012 Maciej Pawlisz
*
* * PACKET_BUFFER_SIZE changed to 2MB
* + Support for unlocked_ioctl
*
* v1.6 - 21-10-2011 Maciej Pawlisz
*
* + Support kernel 3.0
* + Sending front_end_info with stop request on release
* * Allocating/deallocation urbs moved to open/release
*
* v1.5 - 16-07-2011 Maciej Pawlisz
*
* * Name change to Tmsi driver
* * usb_kill_urb instead of usb_unlink_urb in release
* + Support for SynFi device
*
* v1.4 - 01-09-2010
* + Support for kernel 2.6.32 by Maciej Pawlisz (maciej.pawlisz@gmail.com)
*
* v1.3 - 10-03-2008
*
* * Upgraded licence to GPL version 3
* * Fixed compiler warnings on usb_fill_bulk_urb calls
* + Support for kernel 2.6.24
*
* v1.2 - 26-06-2007
*
* + x86_64 architecture IOCTL command added
* * unlink_urb instead of kill_urb in callback handlers
*
* v1.1 - 05-01-2007
*
* - deprecated headers removed
*/
/* Kernel headers */
#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/mutex.h>
#include <asm/uaccess.h>
#include <linux/usb.h>
#include <linux/usb/ch9.h>
#include <linux/kfifo.h>
#include <linux/version.h>
#include <linux/semaphore.h>
/* Driver information */
#define DRIVER_VERSION "1.8.1"
#define DRIVER_AUTHOR "Paul Koster (Clinical Science Systems), p.koster@mailcss.com; Maciej Pawlisz (maciej.pawlisz@gmail.com)"
#define DRIVER_DESC "TMS International USB <-> Fiber Interface Driver for Linux (c) 2005,2010,2011"
/* Define these values to match your devices */
#define USB_TMSI_VENDOR_ID 0x0C7C
#define USB_FUSBI_PRODUCT_ID 0x0004
#define USB_SYNFI_PRODUCT_ID 0x0005
/* IOCTL commands */
#define IOCTL_TMSI_BUFFERSIZE 0x40044601
#define IOCTL_TMSI_BUFFERSIZE_64 0x40084601
/* BLOCK TYPES */
#define TMSI_SYNCHRO 0xAAAA
#define TMSI_FEI 0x0210
#define TMSI_ACK 0x0002
#define TMSI_STOP_REQ 0x11
#define TMSI_MODE_FIELD 4
#define TMSI_CHECKSUM_FIELD 18
/* Buffer structure */
#define PACKET_BUFFER_SIZE 2097152
#define BULK_RECV_URBS 50
#define ISOC_RECV_URBS 50
/* Get a minor range for your devices from the usb maintainer */
#define USB_TMSI_MINOR_BASE 192
#define info(...) printk(KERN_INFO __VA_ARGS__)
#define debug(...) ;
//#define debug(...) printk(KERN_INFO __VA_ARGS__)
/* Structure to hold all of our device specific stuff */
struct tmsi_data {
struct usb_device* udev;
struct usb_interface* interface;
struct kref kref;
__u8 device_open;
// Receive buffers
unsigned char* bulk_recv_buffer[BULK_RECV_URBS];
unsigned char* isoc_recv_buffer[ISOC_RECV_URBS];
// Receive URB's
struct urb* bulk_recv_urb[BULK_RECV_URBS];
struct urb* isoc_recv_urb[ISOC_RECV_URBS];
// FIFO buffer
spinlock_t buffer_lock;
struct kfifo inner_packet_buffer;
struct kfifo * packet_buffer;
struct semaphore * fifo_sem;
// Endpoints
struct usb_endpoint_descriptor* bulk_recv_endpoint;
struct usb_endpoint_descriptor* bulk_send_endpoint;
struct usb_endpoint_descriptor* isoc_recv_endpoint;
//StopRequest
char releasing;
struct semaphore *release_sem;
char * fei; // pointer to front_end_info with stop request
unsigned int fei_size;
};
DEFINE_MUTEX(driver_lock);
static struct usb_driver tmsi_driver;
/*******************************************************************
Function prototypes
*******************************************************************/
// File operations
static int tmsi_open(struct inode *inode, struct file *file);
static int tmsi_release(struct inode *inode, struct file *file);
static int tmsi_release_dev(struct tmsi_data *dev);
static ssize_t tmsi_read(struct file *file, char *buffer, size_t count, loff_t *ppos);
static ssize_t tmsi_write(struct file *file, const char *user_buffer, size_t count, loff_t *ppos);
static ssize_t tmsi_write_data(struct tmsi_data *dev, char *buf, size_t count);
static int tmsi_ioctl(struct inode* inode, struct file* file, unsigned int command, unsigned long argument);
// R/W callback functions
static void tmsi_write_bulk_callback(struct urb *urb, struct pt_regs *regs);
static void tmsi_read_bulk_callback(struct urb *urb, struct pt_regs *regs);
static void tmsi_read_isoc_callback(struct urb *urb, struct pt_regs *regs);
// Deletion function
static void tmsi_delete(struct kref *kref);
/*******************************************************************
File operations function implementations
*******************************************************************/
static int tmsi_open(struct inode *inode, struct file *file) {
struct tmsi_data* dev;
struct usb_interface* interface;
int i, subminor,pipe,retval = 0;
subminor = iminor(inode);
mutex_lock(&driver_lock);
interface = usb_find_interface(&tmsi_driver, subminor);
if (!interface) {
pr_err("%s - error, can't find device for minor %d", __FUNCTION__, subminor);
retval = -ENODEV;
goto exit;
}
dev = usb_get_intfdata(interface);
mutex_unlock(&driver_lock);
if (!dev) {
retval = -ENODEV;
goto exit;
}
if (dev->device_open > 0)
{
retval=-1;
goto exit;
}
else
dev->device_open = 1;
/* increment our usage count for the device */
kref_get(&dev->kref);
/* save our object in the file's private structure */
file->private_data = dev;
// Setup incoming databuffer
#if LINUX_VERSION_CODE > KERNEL_VERSION(3,0,0)
spin_lock_init(&dev->buffer_lock);
#else
dev->buffer_lock = SPIN_LOCK_UNLOCKED;
#endif
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,32)
dev->packet_buffer = &dev->inner_packet_buffer;
kfifo_alloc(dev->packet_buffer, PACKET_BUFFER_SIZE, GFP_KERNEL);
#else
dev->packet_buffer = kfifo_alloc(PACKET_BUFFER_SIZE, GFP_KERNEL, &dev->buffer_lock);
#endif
dev->fifo_sem = kmalloc(sizeof (struct semaphore), GFP_KERNEL);
sema_init(dev->fifo_sem, 0);
dev->release_sem = kmalloc(sizeof (struct semaphore), GFP_KERNEL);
sema_init(dev->release_sem, 0);
// Setup initial bulk receive URB and submit
pipe=usb_rcvbulkpipe(dev->udev, dev->bulk_recv_endpoint->bEndpointAddress);
for (i = 0; i < BULK_RECV_URBS; ++i) {
dev->bulk_recv_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
dev->bulk_recv_buffer[i] = kmalloc(dev->bulk_recv_endpoint->wMaxPacketSize, GFP_KERNEL);
usb_fill_bulk_urb(dev->bulk_recv_urb[i], dev->udev, pipe, dev->bulk_recv_buffer[i], dev->bulk_recv_endpoint->wMaxPacketSize, (usb_complete_t) tmsi_read_bulk_callback, dev);
retval = usb_submit_urb(dev->bulk_recv_urb[i], GFP_KERNEL);
if (retval)
pr_err("%s - failed submitting bulk read urb[%d], error %d", __FUNCTION__, i, retval);
}
// Setup initial isochronous receive URB's and submit
pipe=usb_rcvisocpipe(dev->udev, dev->isoc_recv_endpoint->bEndpointAddress);
for (i = 0; i < ISOC_RECV_URBS; ++i) {
dev->isoc_recv_urb[i] = usb_alloc_urb(1, GFP_KERNEL);
dev->isoc_recv_buffer[i] = kmalloc(dev->isoc_recv_endpoint->wMaxPacketSize, GFP_KERNEL);
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,24)
spin_lock_init(&dev->isoc_recv_urb[i]->lock);
#endif
dev->isoc_recv_urb[i]->dev = dev->udev;
dev->isoc_recv_urb[i]->pipe = pipe;
dev->isoc_recv_urb[i]->transfer_buffer = dev->isoc_recv_buffer[i];
dev->isoc_recv_urb[i]->transfer_buffer_length = dev->isoc_recv_endpoint->wMaxPacketSize;
dev->isoc_recv_urb[i]->complete = (usb_complete_t) tmsi_read_isoc_callback;
dev->isoc_recv_urb[i]->context = dev;
dev->isoc_recv_urb[i]->interval = 1 << (dev->isoc_recv_endpoint->bInterval - 1);
dev->isoc_recv_urb[i]->number_of_packets = 1;
dev->isoc_recv_urb[i]->start_frame = -1;
dev->isoc_recv_urb[i]->iso_frame_desc[0].offset = 0;
dev->isoc_recv_urb[i]->iso_frame_desc[0].length = dev->isoc_recv_endpoint->wMaxPacketSize;
dev->isoc_recv_urb[i]->transfer_flags = URB_ISO_ASAP;
retval = usb_submit_urb(dev->isoc_recv_urb[i], GFP_KERNEL);
if (retval)
pr_err("%s - failed submitting isochronous read urb[%d], error %d", __FUNCTION__, i, retval);
}
info("Tmsi device open() success");
exit:
return retval;
}
static int tmsi_release(struct inode *inode, struct file *file) {
struct tmsi_data* dev;
int retval = 0;
info("Tmsi Release\n");
dev = (struct tmsi_data*) file->private_data;
if (!dev)
return -ENODEV;
dev->releasing = 1;
if (dev->fei)
{
//We have front end info, so just to be sure, we send a stop message
info("Sending stop request\n");
retval = tmsi_write_data(dev, dev->fei, dev->fei_size);
//We are waiting for stop confirmation, for a while....
down_timeout(dev->release_sem, HZ);
//It will be deallocated in write callback
dev->fei=NULL;
}
tmsi_release_dev(dev);
return retval;
}
void free_urb(struct urb *urb)
{
usb_kill_urb(urb);
kfree(urb->transfer_buffer);
usb_free_urb(urb);
}
static int tmsi_release_dev(struct tmsi_data* dev) {
int i;
if (!dev)
return -ENODEV;
// Unlink current receiving bulk URB
for (i = 0; i < BULK_RECV_URBS; ++i)
free_urb(dev->bulk_recv_urb[i]);
// Unlink current receiving isochronous URB's
for (i = ISOC_RECV_URBS-1; i>=0; --i)
free_urb(dev->isoc_recv_urb[i]);
if (dev->device_open > 0)
dev->device_open = 0;
// Remove buffer
kfifo_reset(dev->packet_buffer);
kfifo_free(dev->packet_buffer);
up(dev->fifo_sem);
kfree(dev->fifo_sem);
kfree(dev->release_sem);
/* decrement the count on our device */
kref_put(&dev->kref, tmsi_delete);
info("Tmsi device realese() success\n");
dev->releasing = 0;
return 0;
}
static ssize_t tmsi_read(struct file *file, char *buffer, size_t count, loff_t *ppos) {
struct tmsi_data* dev;
char* temp_buffer = NULL;
int retval = 0;
size_t true_count;
dev = (struct tmsi_data*) file->private_data;
if (down_timeout(dev->fifo_sem, HZ / 2) != 0)
return -ETIME;
while (down_trylock(dev->fifo_sem) == 0);
temp_buffer = kmalloc(count, GFP_KERNEL);
if (!temp_buffer) {
retval = -ENOMEM;
goto exit;
}
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,35)
true_count = kfifo_out_spinlocked(dev->packet_buffer, temp_buffer, count, &dev->buffer_lock);
#elif LINUX_VERSION_CODE > KERNEL_VERSION(2,6,32)
true_count = kfifo_out_locked(dev->packet_buffer, temp_buffer, count, &dev->buffer_lock);
#else
true_count = kfifo_get(dev->packet_buffer, temp_buffer, count);
#endif
/* if the read was successful, copy the data to userspace */
if (copy_to_user(buffer, temp_buffer, true_count))
retval = -EFAULT;
else
retval = true_count;
kfree(temp_buffer);
exit:
if (kfifo_len(dev->packet_buffer) > 0)
up(dev->fifo_sem);
return retval;
}
static ssize_t tmsi_write_data(struct tmsi_data* dev, char * buf, size_t count) {
struct urb *urb = NULL;
int retval = 0;
/* Create an URB */
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb) {
retval = -ENOMEM;
goto error;
}
/* Initialize the urb properly */
usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, dev->bulk_send_endpoint->bEndpointAddress),
buf, count, (usb_complete_t) tmsi_write_bulk_callback, dev);
/* Send the data out the bulk port */
retval = usb_submit_urb(urb, GFP_KERNEL);
if (retval) {
pr_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 */
error:
usb_free_urb(urb);
return retval;
}
static ssize_t tmsi_write(struct file *file, const char *user_buffer, size_t count, loff_t *ppos) {
struct tmsi_data* dev;
int retval = 0;
char *buf = NULL;
unsigned short *packet;
dev = (struct tmsi_data*) file->private_data;
/* Verify that we actually have some data to write */
if (count == 0)
goto exit;
/* Create a send buffer */
buf = kmalloc(count, GFP_KERNEL);
if (!buf) {
retval = -ENOMEM;
goto error;
}
/* Copy the data to the urb */
if (copy_from_user(buf, user_buffer, count)) {
retval = -EFAULT;
goto error;
}
retval = tmsi_write_data(dev, buf, count);
packet = (unsigned short *)buf;
//Storing front end info (FEI) for later use
if (dev->fei==NULL && count>=38 && packet[0]==TMSI_SYNCHRO && packet[1]==TMSI_FEI)
{
dev->fei = kmalloc(count, GFP_KERNEL);
if (dev->fei)
{
unsigned short *vals=(unsigned short *)dev->fei;
dev->fei_size=count;
memcpy(dev->fei,buf,count);
//Modifying FEI: stopp request, and checksum
vals[TMSI_CHECKSUM_FIELD]-=TMSI_STOP_REQ-vals[TMSI_MODE_FIELD];
vals[TMSI_MODE_FIELD]=TMSI_STOP_REQ;
}
}
if (retval < 0)
goto error;
exit:
return count;
error:
debug("Write: error:%d\n",retval);
if (buf) kfree(buf);
return retval;
}
static int tmsi_ioctl(struct inode* inode, struct file* file, unsigned int command, unsigned long argument) {
struct tmsi_data* dev=(struct tmsi_data*) file->private_data;
switch (command) {
case IOCTL_TMSI_BUFFERSIZE_64:
case IOCTL_TMSI_BUFFERSIZE:
return kfifo_len(dev->packet_buffer);
default:
info("%s: IOCTL command 0x%X not implemented!", __FUNCTION__, command);
break;
}
return -1;
}
static long tmsi_unlocked_ioctl(struct file* file, unsigned int command, unsigned long argument){
return tmsi_ioctl(0,file,command,argument);
}
/*******************************************************************
R/W callback functions
*******************************************************************/
static void tmsi_write_bulk_callback(struct urb *urb, struct pt_regs *regs) {
struct tmsi_data* dev;
dev = (struct tmsi_data*) urb->context;
/* sync/async unlink faults aren't errors */
if (urb->status && !(urb->status == -ENOENT || urb->status == -ECONNRESET || urb->status == -ESHUTDOWN))
pr_err("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
/* free up our allocated buffer */
kfree(urb->transfer_buffer);
}
static void tmsi_enqueue_data(struct tmsi_data *dev, const char * buffer, size_t length)
{
if (length == 0)
return;
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,35)
kfifo_in_spinlocked(dev->packet_buffer, buffer, length, &dev->buffer_lock);
#elif LINUX_VERSION_CODE > KERNEL_VERSION(2,6,32)
kfifo_in_locked(dev->packet_buffer, buffer, length, &dev->buffer_lock);
#else
kfifo_put(dev->packet_buffer, buffer, length);
#endif
up(dev->fifo_sem);
}
static void tmsi_read_bulk_callback(struct urb *urb, struct pt_regs *regs) {
int retval = 0;
struct tmsi_data* dev;
if (!(urb->status == -ENOENT || urb->status == -ECONNRESET || urb->status == -ESHUTDOWN)) {
dev = (struct tmsi_data*) urb->context;
if (!dev->device_open) return;
debug("Read_callback: begin%d\n",urb->status);
switch (urb->status) {
case 0:
{
// Packet received is OK and cleared the buffer completely
// Enqueue packet in user buffer
tmsi_enqueue_data(dev,urb->transfer_buffer,urb->actual_length);
if (dev->releasing) {
//We are waiting for ack from amplifier to confirm that sampling is stopped
unsigned short *buf = (unsigned short *) urb->transfer_buffer;
debug("message received while releasing\n");
if (urb->actual_length >= 4) {
if (buf[0] == TMSI_SYNCHRO && buf[1] == TMSI_ACK)
up(dev->release_sem);
else
debug("buf[0]==%d, buf[1]=%d\n", buf[0], buf[1]);
}
}
break;
}
case -EPIPE:
{
// This error occurs when an endpoint has stalled.
info("%s: The bulk endpoint has stalled. (size = %d)", __FUNCTION__, urb->actual_length);
break;
}
default:
{
// Unknown error. Log to syslog
info("%s: Unknown bulk error occurred (status %d)", __FUNCTION__, urb->status);
break;
}
}
urb->dev = dev->udev;
urb->status = 0;
// Submit the URB
retval = usb_submit_urb(urb, GFP_ATOMIC);
if (retval)
pr_err("%s - failed submitting bulk_recv_urb, error %d", __FUNCTION__, retval);
}
}
static void tmsi_read_isoc_callback(struct urb *urb, struct pt_regs *regs) {
int retval = 0,status;
struct tmsi_data* dev;
status=urb->status;
debug("Read isoc callback %x:%d,%d\n",(void *)urb,urb->status,urb->iso_frame_desc[0].status);
if (!(status == -ENOENT || status == -ECONNRESET || status == -ESHUTDOWN)) {
dev = (struct tmsi_data*) urb->context;
if (!dev->device_open) return;
switch (status) {
case 0:
{
// Packet received is OK and cleared the buffer completely
// Enqueue packet in user buffer
tmsi_enqueue_data(dev,urb->transfer_buffer,urb->iso_frame_desc[0].actual_length);
break;
}
default:
{
// Unknown error. Log to syslog
pr_err("%s: Unknown USB error occurred (status %d)", __FUNCTION__, status);
break;
}
}
urb->dev = dev->udev;
urb->status = 0;
urb->iso_frame_desc[0].status = 0;
urb->iso_frame_desc[0].actual_length = 0;
// Submit the URB
retval = usb_submit_urb(urb, GFP_ATOMIC);
if (retval)
pr_err("%s - failed submitting isoc_recv_urb, error %d", __FUNCTION__, retval);
}
}
/*******************************************************************
Delete function for freeing our dev structure
*******************************************************************/
static void tmsi_delete(struct kref *kref) {
struct tmsi_data* dev = container_of(kref, struct tmsi_data, kref);
usb_put_dev(dev->udev);
kfree(dev);
info("Tmsi device deleted");
}
/*******************************************************************
file_operations struct
*******************************************************************/
static struct file_operations tmsi_fops = {
.owner = THIS_MODULE,
.open = tmsi_open,
.release = tmsi_release,
.read = tmsi_read,
.write = tmsi_write,
.unlocked_ioctl = tmsi_unlocked_ioctl,
.compat_ioctl = tmsi_unlocked_ioctl
};
/*******************************************************************
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 tmsi_class = {
.name = "usb/tmsi%d",
.fops = &tmsi_fops,
.minor_base = USB_TMSI_MINOR_BASE,
};
static int tmsi_probe(struct usb_interface *interface, const struct usb_device_id *id) {
struct tmsi_data* dev = NULL;
struct usb_host_interface* iface_desc;
struct usb_endpoint_descriptor* endpoint;
int i;
int retval = -ENOMEM;
// Allocate memory for our device state and initialize it
dev = kmalloc(sizeof (struct tmsi_data), GFP_KERNEL);
if (dev == NULL) {
pr_err("Out of memory");
goto error;
}
memset(dev, 0x00, sizeof (*dev));
// Initialize dev structure
dev->udev = usb_get_dev(interface_to_usbdev(interface));
dev->interface = interface;
kref_init(&dev->kref);
/* Use the alternate interface specified in the tmsi device */
usb_set_interface(dev->udev, 0, 1);
/* set up the endpoint information */
iface_desc = interface->cur_altsetting;
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
endpoint = &iface_desc->endpoint[i].desc;
/* we found a Bulk IN endpoint */
if (!dev->bulk_recv_endpoint && (endpoint->bEndpointAddress & USB_DIR_IN) && ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_BULK))
dev->bulk_recv_endpoint = endpoint;
/* we found a Bulk OUT endpoint */
if (!dev->bulk_send_endpoint && !(endpoint->bEndpointAddress & USB_DIR_IN) && ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_BULK))
dev->bulk_send_endpoint = endpoint;
/* We found an Isochronous IN endpoint */
if (!dev->isoc_recv_endpoint && (endpoint->bEndpointAddress & USB_DIR_IN) && ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_ISOC))
dev->isoc_recv_endpoint = endpoint;
}
/* Check if all required endpoints are present */
if (!(dev->bulk_recv_endpoint && dev->bulk_recv_endpoint->bEndpointAddress &&
dev->bulk_send_endpoint && dev->bulk_send_endpoint->bEndpointAddress &&
dev->isoc_recv_endpoint && dev->isoc_recv_endpoint->bEndpointAddress)) {
pr_err("Could not find the required USB endpoints (bulk in/out, isochronous in)");
goto error;
}
/* Check if device is attached to an USB2 interface */
if (dev->udev->speed != USB_SPEED_HIGH) {
pr_err("Device is not attached to an USB2 bus");
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, &tmsi_class);
if (retval) {
/* something prevented us from registering this driver */
pr_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("%s device (driver version %s) now attached (minor %d)\n", id->idProduct==USB_SYNFI_PRODUCT_ID?"SYNFI":"FUSBI",DRIVER_VERSION, interface->minor);
return 0;
error:
if (dev) {
debug("Kref dec\n");
kref_put(&dev->kref, tmsi_delete);
}
return retval;
}
static void tmsi_disconnect(struct usb_interface *interface) {
struct tmsi_data *dev;
int minor = interface->minor;
info("Disconnecting Tmsi device ...(minor %d)\n", minor);
/* prevent tmsi_open() from racing tmsi_disconnect() */
mutex_lock(&driver_lock);
dev = usb_get_intfdata(interface);
usb_set_intfdata(interface, NULL);
usb_deregister_dev(interface, &tmsi_class);
mutex_unlock(&driver_lock);
/* decrement our usage count */
debug("Kref dec\n");
kref_put(&dev->kref, tmsi_delete);
info("Tmsi device disconnected\n");
}
static struct usb_device_id tmsi_idtable [] = {
{ USB_DEVICE(USB_TMSI_VENDOR_ID, USB_FUSBI_PRODUCT_ID)},
{ USB_DEVICE(USB_TMSI_VENDOR_ID, USB_SYNFI_PRODUCT_ID)},
{} /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, tmsi_idtable);
static struct usb_driver tmsi_driver = {
.name = "tmsi driver",
.probe = tmsi_probe,
.disconnect = tmsi_disconnect,
.id_table = tmsi_idtable,
};
/*******************************************************************
Module entry points
*******************************************************************/
static int __init usb_tmsi_init(void) {
int result;
result = usb_register(&tmsi_driver);
if (result)
pr_err("%s: Registration of tmsi driver failed. (error %d)", __FUNCTION__, result);
return result;
}
static void __exit usb_tmsi_exit(void) {
usb_deregister(&tmsi_driver);
}
module_init(usb_tmsi_init);
module_exit(usb_tmsi_exit);
MODULE_LICENSE("GPL");