Commit 4a62274d authored by David Glance's avatar David Glance Committed by Greg Kroah-Hartman

[PATCH] USB: Add Lego USB Infrared Tower driver

parent 95f530f9
...@@ -58,6 +58,18 @@ config USB_RIO500 ...@@ -58,6 +58,18 @@ config USB_RIO500
To compile this driver as a module, choose M here: the To compile this driver as a module, choose M here: the
module will be called rio500. module will be called rio500.
config USB_LEGOTOWER
tristate "USB Lego Infrared Tower support (EXPERIMENTAL)"
depends on USB && EXPERIMENTAL
help
Say Y here if you want to connect a USB Lego Infrared Tower to your
computer's USB port.
This code is also available as a module ( = code which can be
inserted in and removed from the running kernel whenever you want).
The module will be called legousbtower. If you want to compile it as
a module, say M here and read <file:Documentation/modules.txt>.
config USB_BRLVGER config USB_BRLVGER
tristate "Tieman Voyager USB Braille display support (EXPERIMENTAL)" tristate "Tieman Voyager USB Braille display support (EXPERIMENTAL)"
depends on USB && EXPERIMENTAL depends on USB && EXPERIMENTAL
......
...@@ -12,3 +12,4 @@ obj-$(CONFIG_USB_SPEEDTOUCH) += speedtch.o ...@@ -12,3 +12,4 @@ obj-$(CONFIG_USB_SPEEDTOUCH) += speedtch.o
obj-$(CONFIG_USB_TEST) += usbtest.o obj-$(CONFIG_USB_TEST) += usbtest.o
obj-$(CONFIG_USB_TIGL) += tiglusb.o obj-$(CONFIG_USB_TIGL) += tiglusb.o
obj-$(CONFIG_USB_USS720) += uss720.o obj-$(CONFIG_USB_USS720) += uss720.o
obj-$(CONFIG_USB_LEGOTOWER) += legousbtower.o
/*
* LEGO USB Tower driver
*
* Copyright (c) 2003 David Glance <davidgsf@sourceforge.net>
* 2001 Juergen Stuber <stuber@loria.fr>
*
* 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.
*
* derived from USB Skeleton driver - 0.5
* Copyright (c) 2001 Greg Kroah-Hartman (greg@kroah.com)
*
* History:
*
* 2001-10-13 - 0.1 js
* - first version
* 2001-11-03 - 0.2 js
* - simplified buffering, one-shot URBs for writing
* 2001-11-10 - 0.3 js
* - removed IOCTL (setting power/mode is more complicated, postponed)
* 2001-11-28 - 0.4 js
* - added vendor commands for mode of operation and power level in open
* 2001-12-04 - 0.5 js
* - set IR mode by default (by oversight 0.4 set VLL mode)
* 2002-01-11 - 0.5? pcchan
* - make read buffer reusable and work around bytes_to_write issue between
* uhci and legusbtower
* 2002-09-23 - 0.52 david (david@csse.uwa.edu.au)
* - imported into lejos project
* - changed wake_up to wake_up_interruptible
* - changed to use lego0 rather than tower0
* - changed dbg() to use __func__ rather than deprecated __FUNCTION__
* 2003-01-12 - 0.53 david (david@csse.uwa.edu.au)
* - changed read and write to write everything or timeout (from a patch by Chris Riesen and
* Brett Thaeler driver)
* - added ioctl functionality to set timeouts
* 2003-07-18 - 0.54 davidgsf (david@csse.uwa.edu.au)
* - initial import into LegoUSB project
* - merge of existing LegoUSB.c driver
* 2003-07-18 - 0.56 davidgsf (david@csse.uwa.edu.au)
* - port to 2.6 style driver
*/
#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/smp_lock.h>
#include <linux/completion.h>
#include <asm/uaccess.h>
#include <linux/usb.h>
#ifdef CONFIG_USB_DEBUG
static int debug = 4;
#else
static int debug = 1;
#endif
/* Use our own dbg macro */
#undef dbg
#define dbg(lvl, format, arg...) do { if (debug >= lvl) printk(KERN_DEBUG __FILE__ " : " format " \n", ## arg); } while (0)
/* Version Information */
#define DRIVER_VERSION "v0.56"
#define DRIVER_AUTHOR "David Glance, davidgsf@sourceforge.net"
#define DRIVER_DESC "LEGO USB Tower Driver"
/* Module paramaters */
MODULE_PARM(debug, "i");
MODULE_PARM_DESC(debug, "Debug enabled or not");
/* Define these values to match your device */
#define LEGO_USB_TOWER_VENDOR_ID 0x0694
#define LEGO_USB_TOWER_PRODUCT_ID 0x0001
/* table of devices that work with this driver */
static struct usb_device_id tower_table [] = {
{ USB_DEVICE(LEGO_USB_TOWER_VENDOR_ID, LEGO_USB_TOWER_PRODUCT_ID) },
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE (usb, tower_table);
/* FIXME: Get a minor range for your devices from the usb maintainer */
#define LEGO_USB_TOWER_MINOR_BASE 0xB3
/* we can have up to this number of device plugged in at once */
#define MAX_DEVICES 16
#define COMMAND_TIMEOUT (2*HZ) /* 60 second timeout for a command */
/* Structure to hold all of our device specific stuff */
struct lego_usb_tower {
struct semaphore sem; /* locks this structure */
struct usb_device* udev; /* save off the usb device pointer */
struct usb_interface* interface;
unsigned char minor; /* the starting minor number for this device */
int open_count; /* number of times this port has been opened */
char* read_buffer;
int read_buffer_length;
wait_queue_head_t read_wait;
wait_queue_head_t write_wait;
char* interrupt_in_buffer;
struct usb_endpoint_descriptor* interrupt_in_endpoint;
struct urb* interrupt_in_urb;
char* interrupt_out_buffer;
struct usb_endpoint_descriptor* interrupt_out_endpoint;
struct urb* interrupt_out_urb;
};
/* Note that no locking is needed:
* read_buffer is arbitrated by read_buffer_length == 0
* interrupt_out_buffer is arbitrated by interrupt_out_urb->status == -EINPROGRESS
* interrupt_in_buffer belongs to urb alone and is overwritten on overflow
*/
/* the global usb devfs handle */
// extern devfs_handle_t usb_devfs_handle;
/* local function prototypes */
static ssize_t tower_read (struct file *file, char *buffer, size_t count, loff_t *ppos);
static ssize_t tower_write (struct file *file, const char *buffer, size_t count, loff_t *ppos);
static int tower_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg);
static inline void tower_delete (struct lego_usb_tower *dev);
static int tower_open (struct inode *inode, struct file *file);
static int tower_release (struct inode *inode, struct file *file);
static int tower_release_internal (struct lego_usb_tower *dev);
static void tower_abort_transfers (struct lego_usb_tower *dev);
static void tower_interrupt_in_callback (struct urb *urb, struct pt_regs *regs);
static void tower_interrupt_out_callback (struct urb *urb, struct pt_regs *regs);
static int tower_probe (struct usb_interface *interface, const struct usb_device_id *id);
static void tower_disconnect (struct usb_interface *interface);
/* prevent races between open() and disconnect */
static DECLARE_MUTEX (disconnect_sem);
/* file operations needed when we register this driver */
static struct file_operations tower_fops = {
.owner = THIS_MODULE,
.read = tower_read,
.write = tower_write,
.ioctl = tower_ioctl,
.open = tower_open,
.release = tower_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 tower_class = {
.name = "usb/legousbtower%d",
.fops = &tower_fops,
.mode = S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH,
.minor_base = LEGO_USB_TOWER_MINOR_BASE,
};
/* usb specific object needed to register this driver with the usb subsystem */
static struct usb_driver tower_driver = {
.owner = THIS_MODULE,
.name = "legousbtower",
.probe = tower_probe,
.disconnect = tower_disconnect,
.id_table = tower_table,
};
/**
* lego_usb_tower_debug_data
*/
static inline void lego_usb_tower_debug_data (int level, const char *function, int size, const unsigned char *data)
{
int i;
if (debug < level)
return;
printk (KERN_DEBUG __FILE__": %s - length = %d, data = ", function, size);
for (i = 0; i < size; ++i) {
printk ("%.2x ", data[i]);
}
printk ("\n");
}
/**
* tower_delete
*/
static inline void tower_delete (struct lego_usb_tower *dev)
{
dbg(2, "%s enter", __func__);
tower_abort_transfers (dev);
/* free data structures */
if (dev->interrupt_in_urb != NULL) {
usb_free_urb (dev->interrupt_in_urb);
}
if (dev->interrupt_out_urb != NULL) {
usb_free_urb (dev->interrupt_out_urb);
}
if (dev->read_buffer != NULL) {
kfree (dev->read_buffer);
}
if (dev->interrupt_in_buffer != NULL) {
kfree (dev->interrupt_in_buffer);
}
if (dev->interrupt_out_buffer != NULL) {
kfree (dev->interrupt_out_buffer);
}
kfree (dev);
dbg(2, "%s : leave", __func__);
}
/**
* tower_open
*/
static int tower_open (struct inode *inode, struct file *file)
{
struct lego_usb_tower *dev = NULL;
int subminor;
int retval = 0;
struct usb_interface *interface;
dbg(2,"%s : enter", __func__);
subminor = iminor(inode);
down (&disconnect_sem);
interface = usb_find_interface (&tower_driver, subminor);
if (!interface) {
err ("%s - error, can't find device for minor %d",
__FUNCTION__, subminor);
retval = -ENODEV;
goto exit_no_device;
}
dev = usb_get_intfdata(interface);
if (!dev) {
retval = -ENODEV;
goto exit_no_device;
}
/* lock this device */
down (&dev->sem);
/* increment our usage count for the device */
++dev->open_count;
/* save device in the file's private structure */
file->private_data = dev;
/* initialize in direction */
dev->read_buffer_length = 0;
up (&dev->sem);
exit_no_device:
up (&disconnect_sem);
dbg(2,"%s : leave, return value %d ", __func__, retval);
return retval;
}
/**
* tower_release
*/
static int tower_release (struct inode *inode, struct file *file)
{
struct lego_usb_tower *dev;
int retval = 0;
dbg(2," %s : enter", __func__);
dev = (struct lego_usb_tower *)file->private_data;
if (dev == NULL) {
dbg(1," %s : object is NULL", __func__);
retval = -ENODEV;
goto exit;
}
/* lock our device */
down (&dev->sem);
if (dev->open_count <= 0) {
dbg(1," %s : device not opened", __func__);
retval = -ENODEV;
goto exit;
}
/* do the work */
retval = tower_release_internal (dev);
exit:
up (&dev->sem);
dbg(2," %s : leave, return value %d", __func__, retval);
return retval;
}
/**
* tower_release_internal
*/
static int tower_release_internal (struct lego_usb_tower *dev)
{
int retval = 0;
dbg(2," %s : enter", __func__);
if (dev->udev == NULL) {
/* the device was unplugged before the file was released */
tower_delete (dev);
goto exit;
}
/* decrement our usage count for the device */
--dev->open_count;
if (dev->open_count <= 0) {
tower_abort_transfers (dev);
dev->open_count = 0;
}
exit:
dbg(2," %s : leave", __func__);
return retval;
}
/**
* tower_abort_transfers
* aborts transfers and frees associated data structures
*/
static void tower_abort_transfers (struct lego_usb_tower *dev)
{
dbg(2," %s : enter", __func__);
if (dev == NULL) {
dbg(1," %s : dev is null", __func__);
goto exit;
}
/* shutdown transfer */
if (dev->interrupt_in_urb != NULL) {
usb_unlink_urb (dev->interrupt_in_urb);
}
if (dev->interrupt_out_urb != NULL) {
usb_unlink_urb (dev->interrupt_out_urb);
}
exit:
dbg(2," %s : leave", __func__);
}
/**
* tower_read
*/
static ssize_t tower_read (struct file *file, char *buffer, size_t count, loff_t *ppos)
{
struct lego_usb_tower *dev;
size_t bytes_read = 0;
size_t bytes_to_read;
int i;
int retval = 0;
int timeout = 0;
dbg(2," %s : enter, count = %d", __func__, count);
dev = (struct lego_usb_tower *)file->private_data;
/* lock this object */
down (&dev->sem);
/* verify that the device wasn't unplugged */
if (dev->udev == NULL) {
retval = -ENODEV;
err("No device or device unplugged %d", retval);
goto exit;
}
/* verify that we actually have some data to read */
if (count == 0) {
dbg(1," %s : read request of 0 bytes", __func__);
goto exit;
}
timeout = COMMAND_TIMEOUT;
while (1) {
if (dev->read_buffer_length == 0) {
/* start reading */
usb_fill_int_urb (dev->interrupt_in_urb,dev->udev,
usb_rcvintpipe(dev->udev, dev->interrupt_in_endpoint->bEndpointAddress),
dev->interrupt_in_buffer,
dev->interrupt_in_endpoint->wMaxPacketSize,
tower_interrupt_in_callback,
dev,
dev->interrupt_in_endpoint->bInterval);
retval = usb_submit_urb (dev->interrupt_in_urb, GFP_KERNEL);
if (retval < 0) {
err("Couldn't submit interrupt_in_urb");
goto exit;
}
if (timeout <= 0) {
retval = -ETIMEDOUT;
goto exit;
}
if (signal_pending(current)) {
retval = -EINTR;
goto exit;
}
up (&dev->sem);
timeout = interruptible_sleep_on_timeout (&dev->read_wait, timeout);
down (&dev->sem);
} else {
/* copy the data from read_buffer into userspace */
bytes_to_read = count > dev->read_buffer_length ? dev->read_buffer_length : count;
if (copy_to_user (buffer, dev->read_buffer, bytes_to_read) != 0) {
retval = -EFAULT;
goto exit;
}
dev->read_buffer_length -= bytes_to_read;
for (i=0; i<dev->read_buffer_length; i++) {
dev->read_buffer[i] = dev->read_buffer[i+bytes_to_read];
}
buffer += bytes_to_read;
count -= bytes_to_read;
bytes_read += bytes_to_read;
if (count == 0) {
break;
}
}
}
retval = bytes_read;
exit:
/* unlock the device */
up (&dev->sem);
dbg(2," %s : leave, return value %d", __func__, retval);
return retval;
}
/**
* tower_write
*/
static ssize_t tower_write (struct file *file, const char *buffer, size_t count, loff_t *ppos)
{
struct lego_usb_tower *dev;
size_t bytes_written = 0;
size_t bytes_to_write;
size_t buffer_size;
int retval = 0;
int timeout = 0;
dbg(2," %s : enter, count = %d", __func__, count);
dev = (struct lego_usb_tower *)file->private_data;
/* lock this object */
down (&dev->sem);
/* verify that the device wasn't unplugged */
if (dev->udev == NULL) {
retval = -ENODEV;
err("No device or device unplugged %d", retval);
goto exit;
}
/* verify that we actually have some data to write */
if (count == 0) {
dbg(1," %s : write request of 0 bytes", __func__);
goto exit;
}
while (count > 0) {
if (dev->interrupt_out_urb->status == -EINPROGRESS) {
timeout = COMMAND_TIMEOUT;
while (timeout > 0) {
if (signal_pending(current)) {
dbg(1," %s : interrupted", __func__);
retval = -EINTR;
goto exit;
}
up (&dev->sem);
timeout = interruptible_sleep_on_timeout (&dev->write_wait, timeout);
down (&dev->sem);
if (timeout > 0) {
break;
}
dbg(1," %s : interrupted timeout: %d", __func__, timeout);
}
dbg(1," %s : final timeout: %d", __func__, timeout);
if (timeout == 0) {
dbg(1, "%s - command timed out.", __func__);
retval = -ETIMEDOUT;
goto exit;
}
dbg(4," %s : in progress, count = %d", __func__, count);
} else {
dbg(4," %s : sending, count = %d", __func__, count);
/* write the data into interrupt_out_buffer from userspace */
buffer_size = dev->interrupt_out_endpoint->wMaxPacketSize;
bytes_to_write = count > buffer_size ? buffer_size : count;
dbg(4," %s : buffer_size = %d, count = %d, bytes_to_write = %d", __func__, buffer_size, count, bytes_to_write);
if (copy_from_user (dev->interrupt_out_buffer, buffer, bytes_to_write) != 0) {
retval = -EFAULT;
goto exit;
}
/* send off the urb */
usb_fill_int_urb(
dev->interrupt_out_urb,
dev->udev,
usb_sndintpipe(dev->udev, dev->interrupt_out_endpoint->bEndpointAddress),
dev->interrupt_out_buffer,
bytes_to_write,
tower_interrupt_out_callback,
dev,
dev->interrupt_in_endpoint->bInterval);
dev->interrupt_out_urb->actual_length = bytes_to_write;
retval = usb_submit_urb (dev->interrupt_out_urb, GFP_KERNEL);
if (retval < 0) {
err("Couldn't submit interrupt_out_urb %d", retval);
goto exit;
}
buffer += bytes_to_write;
count -= bytes_to_write;
bytes_written += bytes_to_write;
}
}
retval = bytes_written;
exit:
/* unlock the device */
up (&dev->sem);
dbg(2," %s : leave, return value %d", __func__, retval);
return retval;
}
/**
* Number of reasons why this isn't supported - GKH doesn't like them
* since they are non-portable and also most of this is derived from
* proprietary information
*/
static int tower_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
{
int retval = -ENOTTY; /* default: we don't understand ioctl */
return retval;
}
/**
* tower_interrupt_in_callback
*/
static void tower_interrupt_in_callback (struct urb *urb, struct pt_regs *regs)
{
struct lego_usb_tower *dev = (struct lego_usb_tower *)urb->context;
dbg(4," %s : enter, status %d", __func__, urb->status);
lego_usb_tower_debug_data(5,__func__, urb->actual_length, urb->transfer_buffer);
if (urb->status != 0) {
if ((urb->status != -ENOENT) && (urb->status != -ECONNRESET)) {
dbg(1," %s : nonzero status received: %d", __func__, urb->status);
}
goto exit;
}
down (&dev->sem);
if (urb->actual_length > 0) {
if (dev->read_buffer_length < (4 * dev->interrupt_in_endpoint->wMaxPacketSize) - (urb->actual_length)) {
memcpy (dev->read_buffer+dev->read_buffer_length, dev->interrupt_in_buffer, urb->actual_length);
dev->read_buffer_length += urb->actual_length;
dbg(1," %s reading %d ", __func__, urb->actual_length);
wake_up_interruptible (&dev->read_wait);
} else {
dbg(1," %s : read_buffer overflow", __func__);
}
}
up (&dev->sem);
exit:
lego_usb_tower_debug_data(5,__func__, urb->actual_length, urb->transfer_buffer);
dbg(4," %s : leave, status %d", __func__, urb->status);
}
/**
* tower_interrupt_out_callback
*/
static void tower_interrupt_out_callback (struct urb *urb, struct pt_regs *regs)
{
struct lego_usb_tower *dev = (struct lego_usb_tower *)urb->context;
dbg(4," %s : enter, status %d", __func__, urb->status);
lego_usb_tower_debug_data(5,__func__, urb->actual_length, urb->transfer_buffer);
if (urb->status != 0) {
if ((urb->status != -ENOENT) &&
(urb->status != -ECONNRESET)) {
dbg(1, " %s :nonzero status received: %d", __func__, urb->status);
}
goto exit;
}
wake_up_interruptible(&dev->write_wait);
exit:
lego_usb_tower_debug_data(5,__func__, urb->actual_length, urb->transfer_buffer);
dbg(4," %s : leave, status %d", __func__, urb->status);
}
/**
* tower_probe
*
* Called by the usb core when a new device is connected that it thinks
* this driver might be interested in.
*/
static int tower_probe (struct usb_interface *interface, const struct usb_device_id *id)
{
struct usb_device *udev = interface_to_usbdev(interface);
struct lego_usb_tower *dev = NULL;
struct usb_host_interface *iface_desc;
struct usb_endpoint_descriptor* endpoint;
int i;
int retval = -ENOMEM;
dbg(2," %s : enter", __func__);
if (udev == NULL) {
info ("udev is NULL.");
}
/* See if the device offered us matches what we can accept */
if ((udev->descriptor.idVendor != LEGO_USB_TOWER_VENDOR_ID) ||
(udev->descriptor.idProduct != LEGO_USB_TOWER_PRODUCT_ID)) {
return -ENODEV;
}
/* allocate memory for our device state and intialize it */
dev = kmalloc (sizeof(struct lego_usb_tower), GFP_KERNEL);
if (dev == NULL) {
err ("Out of memory");
goto exit;
}
init_MUTEX (&dev->sem);
dev->udev = udev;
dev->open_count = 0;
dev->read_buffer = NULL;
dev->read_buffer_length = 0;
init_waitqueue_head (&dev->read_wait);
init_waitqueue_head (&dev->write_wait);
dev->interrupt_in_buffer = NULL;
dev->interrupt_in_endpoint = NULL;
dev->interrupt_in_urb = NULL;
dev->interrupt_out_buffer = NULL;
dev->interrupt_out_endpoint = NULL;
dev->interrupt_out_urb = NULL;
iface_desc = &interface->altsetting[0];
/* set up the endpoint information */
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
endpoint = &iface_desc->endpoint[i].desc;
if (((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN) &&
((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT)) {
dev->interrupt_in_endpoint = endpoint;
}
if (((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT) &&
((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT)) {
dev->interrupt_out_endpoint = endpoint;
}
}
if(dev->interrupt_in_endpoint == NULL) {
err("interrupt in endpoint not found");
goto error;
}
if (dev->interrupt_out_endpoint == NULL) {
err("interrupt out endpoint not found");
goto error;
}
dev->read_buffer = kmalloc ((4*dev->interrupt_in_endpoint->wMaxPacketSize), GFP_KERNEL);
if (!dev->read_buffer) {
err("Couldn't allocate read_buffer");
goto error;
}
dev->interrupt_in_buffer = kmalloc (dev->interrupt_in_endpoint->wMaxPacketSize, GFP_KERNEL);
if (!dev->interrupt_in_buffer) {
err("Couldn't allocate interrupt_in_buffer");
goto error;
}
dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!dev->interrupt_in_urb) {
err("Couldn't allocate interrupt_in_urb");
goto error;
}
dev->interrupt_out_buffer = kmalloc (dev->interrupt_out_endpoint->wMaxPacketSize, GFP_KERNEL);
if (!dev->interrupt_out_buffer) {
err("Couldn't allocate interrupt_out_buffer");
goto error;
}
dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!dev->interrupt_out_urb) {
err("Couldn't allocate interrupt_out_urb");
goto error;
}
/* initialize the devfs node for this device and register it */
/* we can register the device now, as it is ready */
usb_set_intfdata (interface, dev);
retval = usb_register_dev (interface, &tower_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;
}
dev->minor = interface->minor;
/* let the user know what node this device is now attached to */
info ("LEGO USB Tower device now attached to /dev/usb/lego%d", (dev->minor - LEGO_USB_TOWER_MINOR_BASE));
exit:
dbg(2," %s : leave, return value 0x%.8lx (dev)", __func__, (long) dev);
return retval;
error:
tower_delete(dev);
return retval;
}
/**
* tower_disconnect
*
* Called by the usb core when the device is removed from the system.
*/
static void tower_disconnect (struct usb_interface *interface)
{
struct lego_usb_tower *dev;
int minor;
dbg(2," %s : enter", __func__);
down (&disconnect_sem);
dev = usb_get_intfdata (interface);
usb_set_intfdata (interface, NULL);
down (&dev->sem);
minor = dev->minor;
/* give back our minor */
usb_deregister_dev (interface, &tower_class);
/* if the device is not opened, then we clean up right now */
if (!dev->open_count) {
up (&dev->sem);
tower_delete (dev);
} else {
dev->udev = NULL;
up (&dev->sem);
}
up (&disconnect_sem);
info("LEGO USB Tower #%d now disconnected", (minor - LEGO_USB_TOWER_MINOR_BASE));
dbg(2," %s : leave", __func__);
}
/**
* lego_usb_tower_init
*/
static int __init lego_usb_tower_init(void)
{
int result;
int retval = 0;
dbg(2," %s : enter", __func__);
/* register this driver with the USB subsystem */
result = usb_register(&tower_driver);
if (result < 0) {
err("usb_register failed for the "__FILE__" driver. Error number %d", result);
retval = -1;
goto exit;
}
info(DRIVER_DESC " " DRIVER_VERSION);
exit:
dbg(2," %s : leave, return value %d", __func__, retval);
return retval;
}
/**
* lego_usb_tower_exit
*/
static void __exit lego_usb_tower_exit(void)
{
dbg(2," %s : enter", __func__);
/* deregister this driver with the USB subsystem */
usb_deregister (&tower_driver);
dbg(2," %s : leave", __func__);
}
module_init (lego_usb_tower_init);
module_exit (lego_usb_tower_exit);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
#ifdef MODULE_LICENSE
MODULE_LICENSE("GPL");
#endif
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