/**
* usb_alphatrack_disconnect
*
* Called by the usb core when the device is removed from the system.
*/
static void usb_alphatrack_disconnect(struct usb_interface *intf)
{
struct usb_alphatrack *dev;
int minor;
mutex_lock(&disconnect_mutex);
dev = usb_get_intfdata(intf);
usb_set_intfdata(intf, NULL);
down(&dev->sem);
minor = intf->minor;
/* give back our minor */
usb_deregister_dev(intf, &usb_alphatrack_class);
/* if the device is not opened, then we clean up right now */
if (!dev->open_count) {
up(&dev->sem);
usb_alphatrack_delete(dev);
} else {
dev->intf = NULL;
up(&dev->sem);
}
atomic_set(&dev->writes_pending, 0);
mutex_unlock(&disconnect_mutex);
dev_info(&intf->dev, "Alphatrack Surface #%d now disconnected\n",
(minor - USB_ALPHATRACK_MINOR_BASE));
}
/**
* usb_alphatrack_release
*/
static int usb_alphatrack_release(struct inode *inode, struct file *file)
{
struct usb_alphatrack *dev;
int retval = 0;
dev = file->private_data;
if (dev == NULL) {
retval = -ENODEV;
goto exit;
}
if (down_interruptible(&dev->sem)) {
retval = -ERESTARTSYS;
goto exit;
}
if (dev->open_count != 1) {
retval = -ENODEV;
goto unlock_exit;
}
if (dev->intf == NULL) {
/* the device was unplugged before the file was released */
up(&dev->sem);
/* unlock here as usb_alphatrack_delete frees dev */
usb_alphatrack_delete(dev);
retval = -ENODEV;
goto exit;
}
/* wait until write transfer is finished */
if (dev->interrupt_out_busy)
wait_event_interruptible_timeout(dev->write_wait,
!dev->interrupt_out_busy,
2 * HZ);
usb_alphatrack_abort_transfers(dev);
dev->open_count = 0;
unlock_exit:
up(&dev->sem);
exit:
return retval;
}
static int usb_alphatrack_release(struct inode *inode, struct file *file)
{
struct usb_alphatrack *dev;
int retval = 0;
dev = file->private_data;
if (dev == NULL) {
retval = -ENODEV;
goto exit;
}
if (down_interruptible(&dev->sem)) {
retval = -ERESTARTSYS;
goto exit;
}
if (dev->open_count != 1) {
retval = -ENODEV;
goto unlock_exit;
}
if (dev->intf == NULL) {
up(&dev->sem);
usb_alphatrack_delete(dev);
retval = -ENODEV;
goto exit;
}
if (dev->interrupt_out_busy)
wait_event_interruptible_timeout(dev->write_wait,
!dev->interrupt_out_busy,
2 * HZ);
usb_alphatrack_abort_transfers(dev);
dev->open_count = 0;
unlock_exit:
up(&dev->sem);
exit:
return retval;
}
/**
* usb_alphatrack_probe
*
* Called by the usb core when a new device is connected that it thinks
* this driver might be interested in.
*/
static int usb_alphatrack_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
struct usb_device *udev = interface_to_usbdev(intf);
struct usb_alphatrack *dev = NULL;
struct usb_host_interface *iface_desc;
struct usb_endpoint_descriptor *endpoint;
int i;
int true_size;
int retval = -ENOMEM;
/* allocate memory for our device state and intialize it */
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (dev == NULL) {
dev_err(&intf->dev, "Out of memory\n");
goto exit;
}
init_MUTEX(&dev->sem);
dev->intf = intf;
init_waitqueue_head(&dev->read_wait);
init_waitqueue_head(&dev->write_wait);
iface_desc = intf->cur_altsetting;
/* 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(&intf->dev, "Interrupt in endpoint not found\n");
goto error;
}
if (dev->interrupt_out_endpoint == NULL)
dev_warn(&intf->dev,
"Interrupt out endpoint not found"
"(using control endpoint instead)\n");
dev->interrupt_in_endpoint_size =
le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize);
if (dev->interrupt_in_endpoint_size != 64)
dev_warn(&intf->dev, "Interrupt in endpoint size is not 64!\n");
if (ring_buffer_size == 0)
ring_buffer_size = RING_BUFFER_SIZE;
true_size = min(ring_buffer_size, RING_BUFFER_SIZE);
/* FIXME - there are more usb_alloc routines for dma correctness.
Needed? */
dev->ring_buffer =
kmalloc((true_size * sizeof(struct alphatrack_icmd)), GFP_KERNEL);
if (!dev->ring_buffer) {
dev_err(&intf->dev,
"Couldn't allocate input ring_buffer of size %d\n",
true_size);
goto error;
}
dev->interrupt_in_buffer =
kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL);
if (!dev->interrupt_in_buffer) {
dev_err(&intf->dev, "Couldn't allocate interrupt_in_buffer\n");
goto error;
}
dev->oldi_buffer = kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL);
if (!dev->oldi_buffer) {
dev_err(&intf->dev, "Couldn't allocate old buffer\n");
goto error;
}
dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!dev->interrupt_in_urb) {
dev_err(&intf->dev, "Couldn't allocate interrupt_in_urb\n");
goto error;
}
dev->interrupt_out_endpoint_size =
dev->interrupt_out_endpoint ? le16_to_cpu(dev->
interrupt_out_endpoint->
wMaxPacketSize) : udev->
descriptor.bMaxPacketSize0;
if (dev->interrupt_out_endpoint_size != 64)
dev_warn(&intf->dev,
"Interrupt out endpoint size is not 64!)\n");
if (write_buffer_size == 0)
write_buffer_size = WRITE_BUFFER_SIZE;
true_size = min(write_buffer_size, WRITE_BUFFER_SIZE);
dev->interrupt_out_buffer =
kmalloc(true_size * dev->interrupt_out_endpoint_size, GFP_KERNEL);
if (!dev->interrupt_out_buffer) {
dev_err(&intf->dev, "Couldn't allocate interrupt_out_buffer\n");
goto error;
}
dev->write_buffer =
kmalloc(sizeof(struct alphatrack_ocmd) * true_size, GFP_KERNEL);
if (!dev->write_buffer) {
dev_err(&intf->dev, "Couldn't allocate write_buffer \n");
goto error;
}
dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!dev->interrupt_out_urb) {
dev_err(&intf->dev, "Couldn't allocate interrupt_out_urb\n");
goto error;
}
dev->interrupt_in_interval =
min_interrupt_in_interval >
dev->interrupt_in_endpoint->
bInterval ? min_interrupt_in_interval : dev->interrupt_in_endpoint->
bInterval;
if (dev->interrupt_out_endpoint)
dev->interrupt_out_interval =
min_interrupt_out_interval >
dev->interrupt_out_endpoint->
bInterval ? min_interrupt_out_interval : dev->
interrupt_out_endpoint->bInterval;
/* we can register the device now, as it is ready */
usb_set_intfdata(intf, dev);
atomic_set(&dev->writes_pending, 0);
retval = usb_register_dev(intf, &usb_alphatrack_class);
if (retval) {
/* something prevented us from registering this driver */
dev_err(&intf->dev,
"Not able to get a minor for this device.\n");
usb_set_intfdata(intf, NULL);
goto error;
}
/* let the user know what node this device is now attached to */
dev_info(&intf->dev,
"Alphatrack Device #%d now attached to major %d minor %d\n",
(intf->minor - USB_ALPHATRACK_MINOR_BASE), USB_MAJOR,
intf->minor);
exit:
return retval;
error:
usb_alphatrack_delete(dev);
return retval;
}
