/*
* 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)
*
* 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 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)
*
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <asm/uaccess.h>
#ifdef CONFIG_USB_DEBUG
static int debug = 5;
#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 "v0.0.13"
#define DRIVER_AUTHOR "John Homppi"
#define DRIVER_DESC "adutux (see www.ontrak.net)"
/* Module parameters */
module_param(debug, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug enabled or not");
/* 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 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) /* 60 second timeout for a command */
/* Structure to hold all of our device specific stuff */
struct adu_device {
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 */
char serial_number[8];
int open_count; /* number of times this port has been opened */
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;
};
/* prevent races between open() and disconnect */
static DEFINE_MUTEX(disconnect_mutex);
static struct usb_driver adu_driver;
static void adu_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");
}
/**
* adu_abort_transfers
* aborts transfers and frees associated data structures
*/
static void adu_abort_transfers(struct adu_device *dev)
{
dbg(2," %s : enter", __FUNCTION__);
if (dev == NULL) {
dbg(1," %s : dev is null", __FUNCTION__);
goto exit;
}
if (dev->udev == NULL) {
dbg(1," %s : udev is null", __FUNCTION__);
goto exit;
}
dbg(2," %s : udev state %d", __FUNCTION__, dev->udev->state);
if (dev->udev->state == USB_STATE_NOTATTACHED) {
dbg(1," %s : udev is not attached", __FUNCTION__);
goto exit;
}
/* shutdown transfer */
usb_unlink_urb(dev->interrupt_in_urb);
usb_unlink_urb(dev->interrupt_out_urb);
exit:
dbg(2," %s : leave", __FUNCTION__);
}
static void adu_delete(struct adu_device *dev)
{
dbg(2, "%s enter", __FUNCTION__);
adu_abort_transfers(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);
kfree(dev);
dbg(2, "%s : leave", __FUNCTION__);
}
static void adu_interrupt_in_callback(struct urb *urb)
{
struct adu_device *dev = urb->context;
dbg(4," %s : enter, status %d", __FUNCTION__, urb->status);
adu_debug_data(5, __FUNCTION__, urb->actual_length,
urb->transfer_buffer);
spin_lock(&dev->buflock);
if (urb->status != 0) {
if ((urb->status != -ENOENT) && (urb->status != -ECONNRESET)) {
dbg(1," %s : nonzero status received: %d",
__FUNCTION__, urb->status);
}
goto exit;
}
if (urb->actual_length > 0 && dev->interrupt_in_buffer[0] != 0x00) {
if (dev->read_buffer_length <
(4 * le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize)) -
(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;
dbg(2," %s reading %d ", __FUNCTION__,
urb->actual_length);
} else {
dbg(1," %s : read_buffer overflow", __FUNCTION__);
}
}
exit:
dev->read_urb_finished = 1;
spin_unlock(&dev->buflock);
/* always wake up so we recover from errors */
wake_up_interruptible(&dev->read_wait);
adu_debug_data(5, __FUNCTION__, urb->actual_length,
urb->transfer_buffer);
dbg(4," %s : leave, status %d", __FUNCTION__, urb->status);
}
static void adu_interrupt_out_callback(struct urb *urb)
{
struct adu_device *dev = urb->context;
dbg(4," %s : enter, status %d", __FUNCTION__, urb->status);
adu_debug_data(5,__FUNCTION__, urb->actual_length, urb->transfer_buffer);
if (urb->status != 0) {
if ((urb->status != -ENOENT) &&
(urb->status != -ECONNRESET)) {
dbg(1, " %s :nonzero status received: %d",
__FUNCTION__, urb->status);
}
goto exit;
}
wake_up_interruptible(&dev->write_wait);
exit:
adu_debug_data(5, __FUNCTION__, urb->actual_length,
urb->transfer_buffer);
dbg(4," %s : leave, status %d", __FUNCTION__, urb->status);
}
static int adu_open(struct inode *inode, struct file *file)
{
struct adu_device *dev = NULL;
struct usb_interface *interface;
int subminor;
int retval = 0;
dbg(2,"%s : enter", __FUNCTION__);
subminor = iminor(inode);
mutex_lock(&disconnect_mutex);
interface = usb_find_interface(&adu_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 */
if ((retval = down_interruptible(&dev->sem))) {
dbg(2, "%s : sem down failed", __FUNCTION__);
goto exit_no_device;
}
/* increment our usage count for the device */
++dev->open_count;
dbg(2,"%s : open count %d", __FUNCTION__, 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,
le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize),
adu_interrupt_in_callback, dev,
dev->interrupt_in_endpoint->bInterval);
/* dev->interrupt_in_urb->transfer_flags |= URB_ASYNC_UNLINK; */
dev->read_urb_finished = 0;
usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
/* we ignore failure */
/* end of fixup for first read */
up(&dev->sem);
exit_no_device:
mutex_unlock(&disconnect_mutex);
dbg(2,"%s : leave, return value %d ", __FUNCTION__, retval);
return retval;
}
static int adu_release_internal(struct adu_device *dev)
{
int retval = 0;
dbg(2," %s : enter", __FUNCTION__);
if (dev->udev == NULL) {
/* the device was unplugged before the file was released */
adu_delete(dev);
goto exit;
}
/* decrement our usage count for the device */
--dev->open_count;
dbg(2," %s : open count %d", __FUNCTION__, dev->open_count);
if (dev->open_count <= 0) {
adu_abort_transfers(dev);
dev->open_count = 0;
}
exit:
dbg(2," %s : leave", __FUNCTION__);
return retval;
}
static int adu_release(struct inode *inode, struct file *file)
{
struct adu_device *dev = NULL;
int retval = 0;
dbg(2," %s : enter", __FUNCTION__);
if (file == NULL) {
dbg(1," %s : file is NULL", __FUNCTION__);
retval = -ENODEV;
goto exit;
}
dev = file->private_data;
if (dev == NULL) {
dbg(1," %s : object is NULL", __FUNCTION__);
retval = -ENODEV;
goto exit;
}
/* lock our device */
down(&dev->sem); /* not interruptible */
if (dev->open_count <= 0) {
dbg(1," %s : device not opened", __FUNCTION__);
retval = -ENODEV;
goto exit;
}
/* do the work */
retval = adu_release_internal(dev);
exit:
if (dev)
up(&dev->sem);
dbg(2," %s : leave, return value %d", __FUNCTION__, retval);
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 i;
int retval = 0;
int timeout = 0;
int should_submit = 0;
unsigned long flags;
DECLARE_WAITQUEUE(wait, current);
dbg(2," %s : enter, count = %Zd, file=%p", __FUNCTION__, count, file);
dev = file->private_data;
dbg(2," %s : dev=%p", __FUNCTION__, dev);
/* lock this object */
if (down_interruptible(&dev->sem))
return -ERESTARTSYS;
/* verify that the device wasn't unplugged */
if (dev->udev == NULL || dev->minor == 0) {
retval = -ENODEV;
err("No device or device unplugged %d", retval);
goto exit;
}
/* verify that some data was requested */
if (count == 0) {
dbg(1," %s : read request of 0 bytes", __FUNCTION__);
goto exit;
}
timeout = COMMAND_TIMEOUT;
dbg(2," %s : about to start looping", __FUNCTION__);
while (bytes_to_read) {
int data_in_secondary = dev->secondary_tail - dev->secondary_head;
dbg(2," %s : while, data_in_secondary=%d, status=%d",
__FUNCTION__, data_in_secondary,
dev->interrupt_in_urb->status);
if (data_in_secondary) {
/* drain secondary buffer */
int amount = bytes_to_read < data_in_secondary ? bytes_to_read : data_in_secondary;
i = copy_to_user(buffer, dev->read_buffer_secondary+dev->secondary_head, amount);
if (i < 0) {
retval = -EFAULT;
goto exit;
}
dev->secondary_head += (amount - i);
bytes_read += (amount - i);
bytes_to_read -= (amount - i);
if (i) {
retval = bytes_read ? bytes_read : -EFAULT;
goto exit;
}
} else {
/* we check the primary buffer */
spin_lock_irqsave (&dev->buflock, flags);
if (dev->read_buffer_length) {
/* we secure access to the primary */
char *tmp;
dbg(2," %s : swap, read_buffer_length = %d",
__FUNCTION__, dev->read_buffer_length);
tmp = dev->read_buffer_secondary;
dev->read_buffer_secondary = dev->read_buffer_primary;
dev->read_buffer_primary = tmp;
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->interrupt_in_urb->status == -EINPROGRESS) {
/* somebody is doing IO */
spin_unlock_irqrestore(&dev->buflock, flags);
dbg(2," %s : submitted already", __FUNCTION__);
} else {
/* we must initiate input */
dbg(2," %s : initiate input", __FUNCTION__);
dev->read_urb_finished = 0;
usb_fill_int_urb(dev->interrupt_in_urb,dev->udev,
usb_rcvintpipe(dev->udev,
dev->interrupt_in_endpoint->bEndpointAddress),
dev->interrupt_in_buffer,
le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize),
adu_interrupt_in_callback,
dev,
dev->interrupt_in_endpoint->bInterval);
retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
if (!retval) {
spin_unlock_irqrestore(&dev->buflock, flags);
dbg(2," %s : submitted OK", __FUNCTION__);
} else {
if (retval == -ENOMEM) {
retval = bytes_read ? bytes_read : -ENOMEM;
}
spin_unlock_irqrestore(&dev->buflock, flags);
dbg(2," %s : submit failed", __FUNCTION__);
goto exit;
}
}
/* we wait for I/O to complete */
set_current_state(TASK_INTERRUPTIBLE);
add_wait_queue(&dev->read_wait, &wait);
if (!dev->read_urb_finished)
timeout = schedule_timeout(COMMAND_TIMEOUT);
else
set_current_state(TASK_RUNNING);
remove_wait_queue(&dev->read_wait, &wait);
if (timeout <= 0) {
dbg(2," %s : timeout", __FUNCTION__);
retval = bytes_read ? bytes_read : -ETIMEDOUT;
goto exit;
}
if (signal_pending(current)) {
dbg(2," %s : signal pending", __FUNCTION__);
retval = bytes_read ? bytes_read : -EINTR;
goto exit;
}
}
}
}
retval = bytes_read;
/* if the primary buffer is empty then use it */
if (should_submit && !dev->interrupt_in_urb->status==-EINPROGRESS) {
usb_fill_int_urb(dev->interrupt_in_urb,dev->udev,
usb_rcvintpipe(dev->udev,
dev->interrupt_in_endpoint->bEndpointAddress),
dev->interrupt_in_buffer,
le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize),
adu_interrupt_in_callback,
dev,
dev->interrupt_in_endpoint->bInterval);
/* dev->interrupt_in_urb->transfer_flags |= URB_ASYNC_UNLINK; */
dev->read_urb_finished = 0;
usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
/* we ignore failure */
}
exit:
/* unlock the device */
up(&dev->sem);
dbg(2," %s : leave, return value %d", __FUNCTION__, retval);
return retval;
}
static ssize_t adu_write(struct file *file, const __user char *buffer,
size_t count, loff_t *ppos)
{
struct adu_device *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 = %Zd", __FUNCTION__, count);
dev = file->private_data;
/* lock this object */
down_interruptible(&dev->sem);
/* verify that the device wasn't unplugged */
if (dev->udev == NULL || dev->minor == 0) {
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", __FUNCTION__);
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", __FUNCTION__);
retval = -EINTR;
goto exit;
}
up(&dev->sem);
timeout = interruptible_sleep_on_timeout(&dev->write_wait, timeout);
down_interruptible(&dev->sem);
if (timeout > 0) {
break;
}
dbg(1," %s : interrupted timeout: %d", __FUNCTION__, timeout);
}
dbg(1," %s : final timeout: %d", __FUNCTION__, timeout);
if (timeout == 0) {
dbg(1, "%s - command timed out.", __FUNCTION__);
retval = -ETIMEDOUT;
goto exit;
}
dbg(4," %s : in progress, count = %Zd", __FUNCTION__, count);
} else {
dbg(4," %s : sending, count = %Zd", __FUNCTION__, count);
/* write the data into interrupt_out_buffer from userspace */
buffer_size = le16_to_cpu(dev->interrupt_out_endpoint->wMaxPacketSize);
bytes_to_write = count > buffer_size ? buffer_size : count;
dbg(4," %s : buffer_size = %Zd, count = %Zd, bytes_to_write = %Zd",
__FUNCTION__, 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_in_endpoint->bInterval);
/* dev->interrupt_in_urb->transfer_flags |= URB_ASYNC_UNLINK; */
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", __FUNCTION__, retval);
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,
};
/*
* 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;
struct usb_host_interface *iface_desc;
struct usb_endpoint_descriptor *endpoint;
int retval = -ENODEV;
int in_end_size;
int out_end_size;
int i;
dbg(2," %s : enter", __FUNCTION__);
if (udev == NULL) {
dev_err(&interface->dev, "udev is NULL.\n");
goto exit;
}
/* allocate memory for our device state and intialize it */
dev = kzalloc(sizeof(struct adu_device), GFP_KERNEL);
if (dev == NULL) {
dev_err(&interface->dev, "Out of memory\n");
retval = -ENOMEM;
goto exit;
}
init_MUTEX(&dev->sem);
spin_lock_init(&dev->buflock);
dev->udev = udev;
init_waitqueue_head(&dev->read_wait);
init_waitqueue_head(&dev->write_wait);
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 (usb_endpoint_is_int_in(endpoint))
dev->interrupt_in_endpoint = endpoint;
if (usb_endpoint_is_int_out(endpoint))
dev->interrupt_out_endpoint = endpoint;
}
if (dev->interrupt_in_endpoint == NULL) {
dev_err(&interface->dev, "interrupt in endpoint not found\n");
goto error;
}
if (dev->interrupt_out_endpoint == NULL) {
dev_err(&interface->dev, "interrupt out endpoint not found\n");
goto error;
}
in_end_size = le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize);
out_end_size = le16_to_cpu(dev->interrupt_out_endpoint->wMaxPacketSize);
dev->read_buffer_primary = kmalloc((4 * in_end_size), GFP_KERNEL);
if (!dev->read_buffer_primary) {
dev_err(&interface->dev, "Couldn't allocate read_buffer_primary\n");
retval = -ENOMEM;
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) {
dev_err(&interface->dev, "Couldn't allocate read_buffer_secondary\n");
retval = -ENOMEM;
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) {
dev_err(&interface->dev, "Couldn't allocate interrupt_in_buffer\n");
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) {
dev_err(&interface->dev, "Couldn't allocate interrupt_in_urb\n");
goto error;
}
dev->interrupt_out_buffer = kmalloc(out_end_size, GFP_KERNEL);
if (!dev->interrupt_out_buffer) {
dev_err(&interface->dev, "Couldn't allocate interrupt_out_buffer\n");
goto error;
}
dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!dev->interrupt_out_urb) {
dev_err(&interface->dev, "Couldn't allocate interrupt_out_urb\n");
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");
goto error;
}
dbg(2," %s : serial_number=%s", __FUNCTION__, 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",
udev->descriptor.idProduct, dev->serial_number,
(dev->minor - ADU_MINOR_BASE));
exit:
dbg(2," %s : leave, return value %p (dev)", __FUNCTION__, dev);
return retval;
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;
int minor;
dbg(2," %s : enter", __FUNCTION__);
mutex_lock(&disconnect_mutex); /* not interruptible */
dev = usb_get_intfdata(interface);
usb_set_intfdata(interface, NULL);
down(&dev->sem); /* not interruptible */
minor = dev->minor;
/* give back our minor */
usb_deregister_dev(interface, &adu_class);
dev->minor = 0;
/* if the device is not opened, then we clean up right now */
dbg(2," %s : open count %d", __FUNCTION__, dev->open_count);
if (!dev->open_count) {
up(&dev->sem);
adu_delete(dev);
} else {
dev->udev = NULL;
up(&dev->sem);
}
mutex_unlock(&disconnect_mutex);
dev_info(&interface->dev, "ADU device adutux%d now disconnected",
(minor - ADU_MINOR_BASE));
dbg(2," %s : leave", __FUNCTION__);
}
/* 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,
};
static int __init adu_init(void)
{
int result;
dbg(2," %s : enter", __FUNCTION__);
/* register this driver with the USB subsystem */
result = usb_register(&adu_driver);
if (result < 0) {
err("usb_register failed for the "__FILE__" driver. "
"Error number %d", result);
goto exit;
}
info("adutux " DRIVER_DESC " " DRIVER_VERSION);
info("adutux is an experimental driver. Use at your own risk");
exit:
dbg(2," %s : leave, return value %d", __FUNCTION__, result);
return result;
}
static void __exit adu_exit(void)
{
dbg(2," %s : enter", __FUNCTION__);
/* deregister this driver with the USB subsystem */
usb_deregister(&adu_driver);
dbg(2," %s : leave", __FUNCTION__);
}
module_init(adu_init);
module_exit(adu_exit);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
