diff options
Diffstat (limited to 'drivers/usb/misc/adutux.c')
| -rw-r--r-- | drivers/usb/misc/adutux.c | 796 |
1 files changed, 796 insertions, 0 deletions
diff --git a/drivers/usb/misc/adutux.c b/drivers/usb/misc/adutux.c new file mode 100644 index 000000000..ed6a19254 --- /dev/null +++ b/drivers/usb/misc/adutux.c @@ -0,0 +1,796 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * adutux - driver for ADU devices from Ontrak Control Systems + * This is an experimental driver. Use at your own risk. + * This driver is not supported by Ontrak Control Systems. + * + * Copyright (c) 2003 John Homppi (SCO, leave this notice here) + * + * derived from the Lego USB Tower driver 0.56: + * Copyright (c) 2003 David Glance <davidgsf@sourceforge.net> + * 2001 Juergen Stuber <stuber@loria.fr> + * that was derived from USB Skeleton driver - 0.5 + * Copyright (c) 2001 Greg Kroah-Hartman (greg@kroah.com) + * + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/kernel.h> +#include <linux/sched/signal.h> +#include <linux/errno.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/usb.h> +#include <linux/mutex.h> +#include <linux/uaccess.h> + +#define DRIVER_AUTHOR "John Homppi" +#define DRIVER_DESC "adutux (see www.ontrak.net)" + +/* Define these values to match your device */ +#define ADU_VENDOR_ID 0x0a07 +#define ADU_PRODUCT_ID 0x0064 + +/* table of devices that work with this driver */ +static const struct usb_device_id device_table[] = { + { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID) }, /* ADU100 */ + { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+20) }, /* ADU120 */ + { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+30) }, /* ADU130 */ + { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+100) }, /* ADU200 */ + { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+108) }, /* ADU208 */ + { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+118) }, /* ADU218 */ + { } /* Terminating entry */ +}; + +MODULE_DEVICE_TABLE(usb, device_table); + +#ifdef CONFIG_USB_DYNAMIC_MINORS +#define ADU_MINOR_BASE 0 +#else +#define ADU_MINOR_BASE 67 +#endif + +/* we can have up to this number of device plugged in at once */ +#define MAX_DEVICES 16 + +#define COMMAND_TIMEOUT (2*HZ) + +/* + * The locking scheme is a vanilla 3-lock: + * adu_device.buflock: A spinlock, covers what IRQs touch. + * adutux_mutex: A Static lock to cover open_count. It would also cover + * any globals, but we don't have them in 2.6. + * adu_device.mtx: A mutex to hold across sleepers like copy_from_user. + * It covers all of adu_device, except the open_count + * and what .buflock covers. + */ + +/* Structure to hold all of our device specific stuff */ +struct adu_device { + struct mutex mtx; + struct usb_device *udev; /* save off the usb device pointer */ + struct usb_interface *interface; + unsigned int minor; /* the starting minor number for this device */ + char serial_number[8]; + + int open_count; /* number of times this port has been opened */ + unsigned long disconnected:1; + + char *read_buffer_primary; + int read_buffer_length; + char *read_buffer_secondary; + int secondary_head; + int secondary_tail; + spinlock_t buflock; + + 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; + int read_urb_finished; + + char *interrupt_out_buffer; + struct usb_endpoint_descriptor *interrupt_out_endpoint; + struct urb *interrupt_out_urb; + int out_urb_finished; +}; + +static DEFINE_MUTEX(adutux_mutex); + +static struct usb_driver adu_driver; + +static inline void adu_debug_data(struct device *dev, const char *function, + int size, const unsigned char *data) +{ + dev_dbg(dev, "%s - length = %d, data = %*ph\n", + function, size, size, data); +} + +/* + * adu_abort_transfers + * aborts transfers and frees associated data structures + */ +static void adu_abort_transfers(struct adu_device *dev) +{ + unsigned long flags; + + if (dev->disconnected) + return; + + /* shutdown transfer */ + + /* XXX Anchor these instead */ + spin_lock_irqsave(&dev->buflock, flags); + if (!dev->read_urb_finished) { + spin_unlock_irqrestore(&dev->buflock, flags); + usb_kill_urb(dev->interrupt_in_urb); + } else + spin_unlock_irqrestore(&dev->buflock, flags); + + spin_lock_irqsave(&dev->buflock, flags); + if (!dev->out_urb_finished) { + spin_unlock_irqrestore(&dev->buflock, flags); + wait_event_timeout(dev->write_wait, dev->out_urb_finished, + COMMAND_TIMEOUT); + usb_kill_urb(dev->interrupt_out_urb); + } else + spin_unlock_irqrestore(&dev->buflock, flags); +} + +static void adu_delete(struct adu_device *dev) +{ + /* free data structures */ + usb_free_urb(dev->interrupt_in_urb); + usb_free_urb(dev->interrupt_out_urb); + kfree(dev->read_buffer_primary); + kfree(dev->read_buffer_secondary); + kfree(dev->interrupt_in_buffer); + kfree(dev->interrupt_out_buffer); + usb_put_dev(dev->udev); + kfree(dev); +} + +static void adu_interrupt_in_callback(struct urb *urb) +{ + struct adu_device *dev = urb->context; + int status = urb->status; + unsigned long flags; + + adu_debug_data(&dev->udev->dev, __func__, + urb->actual_length, urb->transfer_buffer); + + spin_lock_irqsave(&dev->buflock, flags); + + if (status != 0) { + if ((status != -ENOENT) && (status != -ECONNRESET) && + (status != -ESHUTDOWN)) { + dev_dbg(&dev->udev->dev, + "%s : nonzero status received: %d\n", + __func__, status); + } + goto exit; + } + + if (urb->actual_length > 0 && dev->interrupt_in_buffer[0] != 0x00) { + if (dev->read_buffer_length < + (4 * usb_endpoint_maxp(dev->interrupt_in_endpoint)) - + (urb->actual_length)) { + memcpy (dev->read_buffer_primary + + dev->read_buffer_length, + dev->interrupt_in_buffer, urb->actual_length); + + dev->read_buffer_length += urb->actual_length; + dev_dbg(&dev->udev->dev, "%s reading %d\n", __func__, + urb->actual_length); + } else { + dev_dbg(&dev->udev->dev, "%s : read_buffer overflow\n", + __func__); + } + } + +exit: + dev->read_urb_finished = 1; + spin_unlock_irqrestore(&dev->buflock, flags); + /* always wake up so we recover from errors */ + wake_up_interruptible(&dev->read_wait); +} + +static void adu_interrupt_out_callback(struct urb *urb) +{ + struct adu_device *dev = urb->context; + int status = urb->status; + unsigned long flags; + + adu_debug_data(&dev->udev->dev, __func__, + urb->actual_length, urb->transfer_buffer); + + if (status != 0) { + if ((status != -ENOENT) && + (status != -ESHUTDOWN) && + (status != -ECONNRESET)) { + dev_dbg(&dev->udev->dev, + "%s :nonzero status received: %d\n", __func__, + status); + } + return; + } + + spin_lock_irqsave(&dev->buflock, flags); + dev->out_urb_finished = 1; + wake_up(&dev->write_wait); + spin_unlock_irqrestore(&dev->buflock, flags); +} + +static int adu_open(struct inode *inode, struct file *file) +{ + struct adu_device *dev = NULL; + struct usb_interface *interface; + int subminor; + int retval; + + subminor = iminor(inode); + + retval = mutex_lock_interruptible(&adutux_mutex); + if (retval) + goto exit_no_lock; + + interface = usb_find_interface(&adu_driver, subminor); + if (!interface) { + pr_err("%s - error, can't find device for minor %d\n", + __func__, subminor); + retval = -ENODEV; + goto exit_no_device; + } + + dev = usb_get_intfdata(interface); + if (!dev) { + retval = -ENODEV; + goto exit_no_device; + } + + /* check that nobody else is using the device */ + if (dev->open_count) { + retval = -EBUSY; + goto exit_no_device; + } + + ++dev->open_count; + dev_dbg(&dev->udev->dev, "%s: open count %d\n", __func__, + dev->open_count); + + /* save device in the file's private structure */ + file->private_data = dev; + + /* initialize in direction */ + dev->read_buffer_length = 0; + + /* fixup first read by having urb waiting for it */ + usb_fill_int_urb(dev->interrupt_in_urb, dev->udev, + usb_rcvintpipe(dev->udev, + dev->interrupt_in_endpoint->bEndpointAddress), + dev->interrupt_in_buffer, + usb_endpoint_maxp(dev->interrupt_in_endpoint), + adu_interrupt_in_callback, dev, + dev->interrupt_in_endpoint->bInterval); + dev->read_urb_finished = 0; + if (usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL)) + dev->read_urb_finished = 1; + /* we ignore failure */ + /* end of fixup for first read */ + + /* initialize out direction */ + dev->out_urb_finished = 1; + + retval = 0; + +exit_no_device: + mutex_unlock(&adutux_mutex); +exit_no_lock: + return retval; +} + +static void adu_release_internal(struct adu_device *dev) +{ + /* decrement our usage count for the device */ + --dev->open_count; + dev_dbg(&dev->udev->dev, "%s : open count %d\n", __func__, + dev->open_count); + if (dev->open_count <= 0) { + adu_abort_transfers(dev); + dev->open_count = 0; + } +} + +static int adu_release(struct inode *inode, struct file *file) +{ + struct adu_device *dev; + int retval = 0; + + if (file == NULL) { + retval = -ENODEV; + goto exit; + } + + dev = file->private_data; + if (dev == NULL) { + retval = -ENODEV; + goto exit; + } + + mutex_lock(&adutux_mutex); /* not interruptible */ + + if (dev->open_count <= 0) { + dev_dbg(&dev->udev->dev, "%s : device not opened\n", __func__); + retval = -ENODEV; + goto unlock; + } + + adu_release_internal(dev); + if (dev->disconnected) { + /* the device was unplugged before the file was released */ + if (!dev->open_count) /* ... and we're the last user */ + adu_delete(dev); + } +unlock: + mutex_unlock(&adutux_mutex); +exit: + return retval; +} + +static ssize_t adu_read(struct file *file, __user char *buffer, size_t count, + loff_t *ppos) +{ + struct adu_device *dev; + size_t bytes_read = 0; + size_t bytes_to_read = count; + int retval = 0; + int timeout = 0; + int should_submit = 0; + unsigned long flags; + DECLARE_WAITQUEUE(wait, current); + + dev = file->private_data; + if (mutex_lock_interruptible(&dev->mtx)) + return -ERESTARTSYS; + + /* verify that the device wasn't unplugged */ + if (dev->disconnected) { + retval = -ENODEV; + pr_err("No device or device unplugged %d\n", retval); + goto exit; + } + + /* verify that some data was requested */ + if (count == 0) { + dev_dbg(&dev->udev->dev, "%s : read request of 0 bytes\n", + __func__); + goto exit; + } + + timeout = COMMAND_TIMEOUT; + dev_dbg(&dev->udev->dev, "%s : about to start looping\n", __func__); + while (bytes_to_read) { + size_t data_in_secondary = dev->secondary_tail - dev->secondary_head; + dev_dbg(&dev->udev->dev, + "%s : while, data_in_secondary=%zu, status=%d\n", + __func__, data_in_secondary, + dev->interrupt_in_urb->status); + + if (data_in_secondary) { + /* drain secondary buffer */ + size_t amount = min(bytes_to_read, data_in_secondary); + if (copy_to_user(buffer, dev->read_buffer_secondary+dev->secondary_head, amount)) { + retval = -EFAULT; + goto exit; + } + dev->secondary_head += amount; + bytes_read += amount; + bytes_to_read -= amount; + } else { + /* we check the primary buffer */ + spin_lock_irqsave (&dev->buflock, flags); + if (dev->read_buffer_length) { + /* we secure access to the primary */ + dev_dbg(&dev->udev->dev, + "%s : swap, read_buffer_length = %d\n", + __func__, dev->read_buffer_length); + swap(dev->read_buffer_primary, dev->read_buffer_secondary); + dev->secondary_head = 0; + dev->secondary_tail = dev->read_buffer_length; + dev->read_buffer_length = 0; + spin_unlock_irqrestore(&dev->buflock, flags); + /* we have a free buffer so use it */ + should_submit = 1; + } else { + /* even the primary was empty - we may need to do IO */ + if (!dev->read_urb_finished) { + /* somebody is doing IO */ + spin_unlock_irqrestore(&dev->buflock, flags); + dev_dbg(&dev->udev->dev, + "%s : submitted already\n", + __func__); + } else { + /* we must initiate input */ + dev_dbg(&dev->udev->dev, + "%s : initiate input\n", + __func__); + dev->read_urb_finished = 0; + spin_unlock_irqrestore(&dev->buflock, flags); + + usb_fill_int_urb(dev->interrupt_in_urb, dev->udev, + usb_rcvintpipe(dev->udev, + dev->interrupt_in_endpoint->bEndpointAddress), + dev->interrupt_in_buffer, + usb_endpoint_maxp(dev->interrupt_in_endpoint), + adu_interrupt_in_callback, + dev, + dev->interrupt_in_endpoint->bInterval); + retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL); + if (retval) { + dev->read_urb_finished = 1; + if (retval == -ENOMEM) { + retval = bytes_read ? bytes_read : -ENOMEM; + } + dev_dbg(&dev->udev->dev, + "%s : submit failed\n", + __func__); + goto exit; + } + } + + /* we wait for I/O to complete */ + set_current_state(TASK_INTERRUPTIBLE); + add_wait_queue(&dev->read_wait, &wait); + spin_lock_irqsave(&dev->buflock, flags); + if (!dev->read_urb_finished) { + spin_unlock_irqrestore(&dev->buflock, flags); + timeout = schedule_timeout(COMMAND_TIMEOUT); + } else { + spin_unlock_irqrestore(&dev->buflock, flags); + set_current_state(TASK_RUNNING); + } + remove_wait_queue(&dev->read_wait, &wait); + + if (timeout <= 0) { + dev_dbg(&dev->udev->dev, + "%s : timeout\n", __func__); + retval = bytes_read ? bytes_read : -ETIMEDOUT; + goto exit; + } + + if (signal_pending(current)) { + dev_dbg(&dev->udev->dev, + "%s : signal pending\n", + __func__); + retval = bytes_read ? bytes_read : -EINTR; + goto exit; + } + } + } + } + + retval = bytes_read; + /* if the primary buffer is empty then use it */ + spin_lock_irqsave(&dev->buflock, flags); + if (should_submit && dev->read_urb_finished) { + dev->read_urb_finished = 0; + spin_unlock_irqrestore(&dev->buflock, flags); + usb_fill_int_urb(dev->interrupt_in_urb, dev->udev, + usb_rcvintpipe(dev->udev, + dev->interrupt_in_endpoint->bEndpointAddress), + dev->interrupt_in_buffer, + usb_endpoint_maxp(dev->interrupt_in_endpoint), + adu_interrupt_in_callback, + dev, + dev->interrupt_in_endpoint->bInterval); + if (usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL) != 0) + dev->read_urb_finished = 1; + /* we ignore failure */ + } else { + spin_unlock_irqrestore(&dev->buflock, flags); + } + +exit: + /* unlock the device */ + mutex_unlock(&dev->mtx); + + return retval; +} + +static ssize_t adu_write(struct file *file, const __user char *buffer, + size_t count, loff_t *ppos) +{ + DECLARE_WAITQUEUE(waita, current); + struct adu_device *dev; + size_t bytes_written = 0; + size_t bytes_to_write; + size_t buffer_size; + unsigned long flags; + int retval; + + dev = file->private_data; + + retval = mutex_lock_interruptible(&dev->mtx); + if (retval) + goto exit_nolock; + + /* verify that the device wasn't unplugged */ + if (dev->disconnected) { + retval = -ENODEV; + pr_err("No device or device unplugged %d\n", retval); + goto exit; + } + + /* verify that we actually have some data to write */ + if (count == 0) { + dev_dbg(&dev->udev->dev, "%s : write request of 0 bytes\n", + __func__); + goto exit; + } + + while (count > 0) { + add_wait_queue(&dev->write_wait, &waita); + set_current_state(TASK_INTERRUPTIBLE); + spin_lock_irqsave(&dev->buflock, flags); + if (!dev->out_urb_finished) { + spin_unlock_irqrestore(&dev->buflock, flags); + + mutex_unlock(&dev->mtx); + if (signal_pending(current)) { + dev_dbg(&dev->udev->dev, "%s : interrupted\n", + __func__); + set_current_state(TASK_RUNNING); + retval = -EINTR; + goto exit_onqueue; + } + if (schedule_timeout(COMMAND_TIMEOUT) == 0) { + dev_dbg(&dev->udev->dev, + "%s - command timed out.\n", __func__); + retval = -ETIMEDOUT; + goto exit_onqueue; + } + remove_wait_queue(&dev->write_wait, &waita); + retval = mutex_lock_interruptible(&dev->mtx); + if (retval) { + retval = bytes_written ? bytes_written : retval; + goto exit_nolock; + } + + dev_dbg(&dev->udev->dev, + "%s : in progress, count = %zd\n", + __func__, count); + } else { + spin_unlock_irqrestore(&dev->buflock, flags); + set_current_state(TASK_RUNNING); + remove_wait_queue(&dev->write_wait, &waita); + dev_dbg(&dev->udev->dev, "%s : sending, count = %zd\n", + __func__, count); + + /* write the data into interrupt_out_buffer from userspace */ + buffer_size = usb_endpoint_maxp(dev->interrupt_out_endpoint); + bytes_to_write = count > buffer_size ? buffer_size : count; + dev_dbg(&dev->udev->dev, + "%s : buffer_size = %zd, count = %zd, bytes_to_write = %zd\n", + __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, + adu_interrupt_out_callback, + dev, + dev->interrupt_out_endpoint->bInterval); + dev->interrupt_out_urb->actual_length = bytes_to_write; + dev->out_urb_finished = 0; + retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL); + if (retval < 0) { + dev->out_urb_finished = 1; + dev_err(&dev->udev->dev, "Couldn't submit " + "interrupt_out_urb %d\n", retval); + goto exit; + } + + buffer += bytes_to_write; + count -= bytes_to_write; + + bytes_written += bytes_to_write; + } + } + mutex_unlock(&dev->mtx); + return bytes_written; + +exit: + mutex_unlock(&dev->mtx); +exit_nolock: + return retval; + +exit_onqueue: + remove_wait_queue(&dev->write_wait, &waita); + return retval; +} + +/* file operations needed when we register this driver */ +static const struct file_operations adu_fops = { + .owner = THIS_MODULE, + .read = adu_read, + .write = adu_write, + .open = adu_open, + .release = adu_release, + .llseek = noop_llseek, +}; + +/* + * 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 adu_class = { + .name = "usb/adutux%d", + .fops = &adu_fops, + .minor_base = ADU_MINOR_BASE, +}; + +/* + * adu_probe + * + * Called by the usb core when a new device is connected that it thinks + * this driver might be interested in. + */ +static int adu_probe(struct usb_interface *interface, + const struct usb_device_id *id) +{ + struct usb_device *udev = interface_to_usbdev(interface); + struct adu_device *dev = NULL; + int retval = -ENOMEM; + int in_end_size; + int out_end_size; + int res; + + /* allocate memory for our device state and initialize it */ + dev = kzalloc(sizeof(struct adu_device), GFP_KERNEL); + if (!dev) + return -ENOMEM; + + mutex_init(&dev->mtx); + spin_lock_init(&dev->buflock); + dev->udev = usb_get_dev(udev); + init_waitqueue_head(&dev->read_wait); + init_waitqueue_head(&dev->write_wait); + + res = usb_find_common_endpoints_reverse(interface->cur_altsetting, + NULL, NULL, + &dev->interrupt_in_endpoint, + &dev->interrupt_out_endpoint); + if (res) { + dev_err(&interface->dev, "interrupt endpoints not found\n"); + retval = res; + goto error; + } + + in_end_size = usb_endpoint_maxp(dev->interrupt_in_endpoint); + out_end_size = usb_endpoint_maxp(dev->interrupt_out_endpoint); + + dev->read_buffer_primary = kmalloc((4 * in_end_size), GFP_KERNEL); + if (!dev->read_buffer_primary) + goto error; + + /* debug code prime the buffer */ + memset(dev->read_buffer_primary, 'a', in_end_size); + memset(dev->read_buffer_primary + in_end_size, 'b', in_end_size); + memset(dev->read_buffer_primary + (2 * in_end_size), 'c', in_end_size); + memset(dev->read_buffer_primary + (3 * in_end_size), 'd', in_end_size); + + dev->read_buffer_secondary = kmalloc((4 * in_end_size), GFP_KERNEL); + if (!dev->read_buffer_secondary) + goto error; + + /* debug code prime the buffer */ + memset(dev->read_buffer_secondary, 'e', in_end_size); + memset(dev->read_buffer_secondary + in_end_size, 'f', in_end_size); + memset(dev->read_buffer_secondary + (2 * in_end_size), 'g', in_end_size); + memset(dev->read_buffer_secondary + (3 * in_end_size), 'h', in_end_size); + + dev->interrupt_in_buffer = kmalloc(in_end_size, GFP_KERNEL); + if (!dev->interrupt_in_buffer) + goto error; + + /* debug code prime the buffer */ + memset(dev->interrupt_in_buffer, 'i', in_end_size); + + dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL); + if (!dev->interrupt_in_urb) + goto error; + dev->interrupt_out_buffer = kmalloc(out_end_size, GFP_KERNEL); + if (!dev->interrupt_out_buffer) + goto error; + dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL); + if (!dev->interrupt_out_urb) + goto error; + + if (!usb_string(udev, udev->descriptor.iSerialNumber, dev->serial_number, + sizeof(dev->serial_number))) { + dev_err(&interface->dev, "Could not retrieve serial number\n"); + retval = -EIO; + goto error; + } + dev_dbg(&interface->dev, "serial_number=%s", dev->serial_number); + + /* we can register the device now, as it is ready */ + usb_set_intfdata(interface, dev); + + retval = usb_register_dev(interface, &adu_class); + + if (retval) { + /* something prevented us from registering this driver */ + dev_err(&interface->dev, "Not able to get a minor for this device.\n"); + usb_set_intfdata(interface, NULL); + goto error; + } + + dev->minor = interface->minor; + + /* let the user know what node this device is now attached to */ + dev_info(&interface->dev, "ADU%d %s now attached to /dev/usb/adutux%d\n", + le16_to_cpu(udev->descriptor.idProduct), dev->serial_number, + (dev->minor - ADU_MINOR_BASE)); + + return 0; + +error: + adu_delete(dev); + return retval; +} + +/* + * adu_disconnect + * + * Called by the usb core when the device is removed from the system. + */ +static void adu_disconnect(struct usb_interface *interface) +{ + struct adu_device *dev; + + dev = usb_get_intfdata(interface); + + usb_deregister_dev(interface, &adu_class); + + usb_poison_urb(dev->interrupt_in_urb); + usb_poison_urb(dev->interrupt_out_urb); + + mutex_lock(&adutux_mutex); + usb_set_intfdata(interface, NULL); + + mutex_lock(&dev->mtx); /* not interruptible */ + dev->disconnected = 1; + mutex_unlock(&dev->mtx); + + /* if the device is not opened, then we clean up right now */ + if (!dev->open_count) + adu_delete(dev); + + mutex_unlock(&adutux_mutex); +} + +/* usb specific object needed to register this driver with the usb subsystem */ +static struct usb_driver adu_driver = { + .name = "adutux", + .probe = adu_probe, + .disconnect = adu_disconnect, + .id_table = device_table, +}; + +module_usb_driver(adu_driver); + +MODULE_AUTHOR(DRIVER_AUTHOR); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL"); |