[linux-2.6-block.git] / drivers / usb / misc / usblcd.c

/*****************************************************************************
 *                          USBLCD Kernel Driver                             *
 *                            Version 1.05                                   *
 *             (C) 2005 Georges Toth <g.toth@e-biz.lu>                       *
 *                                                                           *
 *     This file is licensed under the GPL. See COPYING in the package.      *
 * Based on usb-skeleton.c 2.0 by Greg Kroah-Hartman (greg@kroah.com)        *
 *                                                                           *
 *                                                                           *
 * 28.02.05 Complete rewrite of the original usblcd.c driver,                *
 *          based on usb_skeleton.c.                                         *
 *          This new driver allows more than one USB-LCD to be connected     *
 *          and controlled, at once                                          *
 *****************************************************************************/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <asm/uaccess.h>
#include <linux/usb.h>

#define DRIVER_VERSION "USBLCD Driver Version 1.05"

#define USBLCD_MINOR		144

#define IOCTL_GET_HARD_VERSION	1
#define IOCTL_GET_DRV_VERSION	2


static struct usb_device_id id_table [] = {
	{ .idVendor = 0x10D2, .match_flags = USB_DEVICE_ID_MATCH_VENDOR, },
	{ },
};
MODULE_DEVICE_TABLE (usb, id_table);


struct usb_lcd {
	struct usb_device *	udev;			/* init: probe_lcd */
	struct usb_interface *  interface;		/* the interface for this device */
	unsigned char *         bulk_in_buffer;		/* the buffer to receive data */
	size_t			bulk_in_size;		/* the size of the receive buffer */
	__u8			bulk_in_endpointAddr;	/* the address of the bulk in endpoint */
	__u8			bulk_out_endpointAddr;	/* the address of the bulk out endpoint */
	struct kref             kref;
};
#define to_lcd_dev(d) container_of(d, struct usb_lcd, kref)

static struct usb_driver lcd_driver;
static DEFINE_MUTEX(usb_lcd_open_mutex);


static void lcd_delete(struct kref *kref)
{
	struct usb_lcd *dev = to_lcd_dev(kref);

	usb_put_dev(dev->udev);
	kfree (dev->bulk_in_buffer);
	kfree (dev);
}


static int lcd_open(struct inode *inode, struct file *file)
{
	struct usb_lcd *dev;
	struct usb_interface *interface;
	int subminor;
	int retval = 0;

	subminor = iminor(inode);

	mutex_lock(&usb_lcd_open_mutex);
	interface = usb_find_interface(&lcd_driver, subminor);
	if (!interface) {
		err ("USBLCD: %s - error, can't find device for minor %d",
		     __FUNCTION__, subminor);
		retval = -ENODEV;
		goto exit;
	}

	dev = usb_get_intfdata(interface);
	if (!dev) {
		retval = -ENODEV;
		goto exit;
	}

	/* increment our usage count for the device */
	kref_get(&dev->kref);

	/* save our object in the file's private structure */
	file->private_data = dev;

exit:
	mutex_unlock(&usb_lcd_open_mutex);
	return retval;
}

static int lcd_release(struct inode *inode, struct file *file)
{
	struct usb_lcd *dev;

	dev = (struct usb_lcd *)file->private_data;
	if (dev == NULL)
		return -ENODEV;

	/* decrement the count on our device */
	kref_put(&dev->kref, lcd_delete);
	return 0;
}

static ssize_t lcd_read(struct file *file, char __user * buffer, size_t count, loff_t *ppos)
{
	struct usb_lcd *dev;
	int retval = 0;
	int bytes_read;

	dev = (struct usb_lcd *)file->private_data;

	/* do a blocking bulk read to get data from the device */
	retval = usb_bulk_msg(dev->udev, 
			      usb_rcvbulkpipe(dev->udev, dev->bulk_in_endpointAddr),
			      dev->bulk_in_buffer,
			      min(dev->bulk_in_size, count),
			      &bytes_read, 10000);

	/* if the read was successful, copy the data to userspace */
	if (!retval) {
		if (copy_to_user(buffer, dev->bulk_in_buffer, bytes_read))
			retval = -EFAULT;
		else
			retval = bytes_read;
	}

	return retval;
}

static int lcd_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
{
	struct usb_lcd *dev;
	u16 bcdDevice;
	char buf[30];

	dev = (struct usb_lcd *)file->private_data;
	if (dev == NULL)
		return -ENODEV;
	
	switch (cmd) {
	case IOCTL_GET_HARD_VERSION:
		bcdDevice = le16_to_cpu((dev->udev)->descriptor.bcdDevice);
		sprintf(buf,"%1d%1d.%1d%1d",
			(bcdDevice & 0xF000)>>12,
			(bcdDevice & 0xF00)>>8,
			(bcdDevice & 0xF0)>>4,
			(bcdDevice & 0xF));
		if (copy_to_user((void __user *)arg,buf,strlen(buf))!=0)
			return -EFAULT;
		break;
	case IOCTL_GET_DRV_VERSION:
		sprintf(buf,DRIVER_VERSION);
		if (copy_to_user((void __user *)arg,buf,strlen(buf))!=0)
			return -EFAULT;
		break;
	default:
		return -ENOTTY;
		break;
	}

	return 0;
}

static void lcd_write_bulk_callback(struct urb *urb)
{
	struct usb_lcd *dev;

	dev = (struct usb_lcd *)urb->context;

	/* sync/async unlink faults aren't errors */
	if (urb->status &&
	    !(urb->status == -ENOENT ||
	      urb->status == -ECONNRESET ||
              urb->status == -ESHUTDOWN)) {
		dbg("USBLCD: %s - nonzero write bulk status received: %d",
		    __FUNCTION__, urb->status);
	}

	/* free up our allocated buffer */
	usb_buffer_free(urb->dev, urb->transfer_buffer_length,
			urb->transfer_buffer, urb->transfer_dma);
}

static ssize_t lcd_write(struct file *file, const char __user * user_buffer, size_t count, loff_t *ppos)
{
	struct usb_lcd *dev;
        int retval = 0;
	struct urb *urb = NULL;
	char *buf = NULL;
	
	dev = (struct usb_lcd *)file->private_data;
	
	/* verify that we actually have some data to write */
	if (count == 0)
		goto exit;

	/* create a urb, and a buffer for it, and copy the data to the urb */
	urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!urb)
		return -ENOMEM;
	
	buf = usb_buffer_alloc(dev->udev, count, GFP_KERNEL, &urb->transfer_dma);
	if (!buf) {
		retval = -ENOMEM;
		goto error;
	}
	
	if (copy_from_user(buf, user_buffer, count)) {
		retval = -EFAULT;
		goto error;
	}
	
	/* initialize the urb properly */
	usb_fill_bulk_urb(urb, dev->udev,
			  usb_sndbulkpipe(dev->udev, dev->bulk_out_endpointAddr),
			  buf, count, lcd_write_bulk_callback, dev);
	urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
	
	/* send the data out the bulk port */
	retval = usb_submit_urb(urb, GFP_KERNEL);
	if (retval) {
		err("USBLCD: %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 */
	usb_free_urb(urb);

exit:
	return count;

error:
	usb_buffer_free(dev->udev, count, buf, urb->transfer_dma);
	usb_free_urb(urb);
	return retval;
}

static const struct file_operations lcd_fops = {
        .owner =        THIS_MODULE,
        .read =         lcd_read,
        .write =        lcd_write,
        .open =         lcd_open,
	.ioctl =        lcd_ioctl,
        .release =      lcd_release,
};

/*
 * 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 lcd_class = {
        .name =         "lcd%d",
        .fops =         &lcd_fops,
        .minor_base =   USBLCD_MINOR,
};

static int lcd_probe(struct usb_interface *interface, const struct usb_device_id *id)
{
	struct usb_lcd *dev = NULL;
	struct usb_host_interface *iface_desc;
	struct usb_endpoint_descriptor *endpoint;
	size_t buffer_size;
	int i;
	int retval = -ENOMEM;

	/* allocate memory for our device state and initialize it */
	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
	if (dev == NULL) {
		err("Out of memory");
		goto error;
	}
	kref_init(&dev->kref);

	dev->udev = usb_get_dev(interface_to_usbdev(interface));
	dev->interface = interface;

	if (le16_to_cpu(dev->udev->descriptor.idProduct) != 0x0001) {
		warn(KERN_INFO "USBLCD model not supported.");
		return -ENODEV;
	}
	
	/* set up the endpoint information */
	/* use only the first bulk-in and bulk-out endpoints */
	iface_desc = interface->cur_altsetting;
	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
		endpoint = &iface_desc->endpoint[i].desc;

		if (!dev->bulk_in_endpointAddr &&
		    usb_endpoint_is_bulk_in(endpoint)) {
			/* we found a bulk in endpoint */
			buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
			dev->bulk_in_size = buffer_size;
			dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
			dev->bulk_in_buffer = kmalloc(buffer_size, GFP_KERNEL);
			if (!dev->bulk_in_buffer) {
				err("Could not allocate bulk_in_buffer");
				goto error;
			}
		}

		if (!dev->bulk_out_endpointAddr &&
		    usb_endpoint_is_bulk_out(endpoint)) {
			/* we found a bulk out endpoint */
			dev->bulk_out_endpointAddr = endpoint->bEndpointAddress;
		}
	}
	if (!(dev->bulk_in_endpointAddr && dev->bulk_out_endpointAddr)) {
		err("Could not find both bulk-in and bulk-out endpoints");
		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, &lcd_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;
	}

	i = le16_to_cpu(dev->udev->descriptor.bcdDevice);

	info("USBLCD Version %1d%1d.%1d%1d found at address %d",
		(i & 0xF000)>>12,(i & 0xF00)>>8,(i & 0xF0)>>4,(i & 0xF),
		dev->udev->devnum);

	/* let the user know what node this device is now attached to */
	info("USB LCD device now attached to USBLCD-%d", interface->minor);
	return 0;

error:
	if (dev)
		kref_put(&dev->kref, lcd_delete);
	return retval;
}

static void lcd_disconnect(struct usb_interface *interface)
{
	struct usb_lcd *dev;
        int minor = interface->minor;

        /* prevent skel_open() from racing skel_disconnect() */
        mutex_lock(&usb_lcd_open_mutex);

        dev = usb_get_intfdata(interface);
        usb_set_intfdata(interface, NULL);

        /* give back our minor */
        usb_deregister_dev(interface, &lcd_class);
 
	mutex_unlock(&usb_lcd_open_mutex);

	/* decrement our usage count */
	kref_put(&dev->kref, lcd_delete);

	info("USB LCD #%d now disconnected", minor);
}

static struct usb_driver lcd_driver = {
	.name =		"usblcd",
	.probe =	lcd_probe,
	.disconnect =	lcd_disconnect,
	.id_table =	id_table,
};

static int __init usb_lcd_init(void)
{
	int result;
	
	result = usb_register(&lcd_driver);
	if (result)
		err("usb_register failed. Error number %d", result);

	return result;
}


static void __exit usb_lcd_exit(void)
{
	usb_deregister(&lcd_driver);
}

module_init(usb_lcd_init);
module_exit(usb_lcd_exit);

MODULE_AUTHOR("Georges Toth <g.toth@e-biz.lu>");
MODULE_DESCRIPTION(DRIVER_VERSION);
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*****************************************************************************
	2	* USBLCD Kernel Driver *
	3	* Version 1.05 *
	4	* (C) 2005 Georges Toth <g.toth@e-biz.lu> *
	5	* *
	6	* This file is licensed under the GPL. See COPYING in the package. *
	7	* Based on usb-skeleton.c 2.0 by Greg Kroah-Hartman (greg@kroah.com) *
	8	* *
	9	* *
	10	* 28.02.05 Complete rewrite of the original usblcd.c driver, *
	11	* based on usb_skeleton.c. *
	12	* This new driver allows more than one USB-LCD to be connected *
	13	* and controlled, at once *
	14	*****************************************************************************/
	15	#include <linux/module.h>
	16	#include <linux/kernel.h>
	17	#include <linux/init.h>
	18	#include <linux/slab.h>
	19	#include <linux/errno.h>
	20	#include <asm/uaccess.h>
	21	#include <linux/usb.h>
	22
	23	#define DRIVER_VERSION "USBLCD Driver Version 1.05"
	24
	25	#define USBLCD_MINOR 144
	26
	27	#define IOCTL_GET_HARD_VERSION 1
	28	#define IOCTL_GET_DRV_VERSION 2
	29
	30
	31	static struct usb_device_id id_table [] = {
	32	{ .idVendor = 0x10D2, .match_flags = USB_DEVICE_ID_MATCH_VENDOR, },
	33	{ },
	34	};
	35	MODULE_DEVICE_TABLE (usb, id_table);
	36
	37
	38	struct usb_lcd {
	39	struct usb_device * udev; /* init: probe_lcd */
	40	struct usb_interface * interface; /* the interface for this device */
	41	unsigned char * bulk_in_buffer; /* the buffer to receive data */
	42	size_t bulk_in_size; /* the size of the receive buffer */
	43	__u8 bulk_in_endpointAddr; /* the address of the bulk in endpoint */
	44	__u8 bulk_out_endpointAddr; /* the address of the bulk out endpoint */
	45	struct kref kref;
	46	};
	47	#define to_lcd_dev(d) container_of(d, struct usb_lcd, kref)
	48
	49	static struct usb_driver lcd_driver;
2e85c91e	50	static DEFINE_MUTEX(usb_lcd_open_mutex);
1da177e4 LT	51
	52
	53	static void lcd_delete(struct kref *kref)
	54	{
	55	struct usb_lcd *dev = to_lcd_dev(kref);
	56
	57	usb_put_dev(dev->udev);
	58	kfree (dev->bulk_in_buffer);
	59	kfree (dev);
	60	}
	61
	62
	63	static int lcd_open(struct inode inode, struct file file)
	64	{
	65	struct usb_lcd *dev;
	66	struct usb_interface *interface;
	67	int subminor;
	68	int retval = 0;
	69
	70	subminor = iminor(inode);
	71
2e85c91e	72	mutex_lock(&usb_lcd_open_mutex);
1da177e4 LT	73	interface = usb_find_interface(&lcd_driver, subminor);
	74	if (!interface) {
	75	err ("USBLCD: %s - error, can't find device for minor %d",
	76	__FUNCTION__, subminor);
	77	retval = -ENODEV;
	78	goto exit;
	79	}
	80
	81	dev = usb_get_intfdata(interface);
	82	if (!dev) {
	83	retval = -ENODEV;
	84	goto exit;
	85	}
	86
	87	/* increment our usage count for the device */
	88	kref_get(&dev->kref);
	89
	90	/* save our object in the file's private structure */
	91	file->private_data = dev;
	92
	93	exit:
2e85c91e	94	mutex_unlock(&usb_lcd_open_mutex);
1da177e4 LT	95	return retval;
	96	}
	97
	98	static int lcd_release(struct inode inode, struct file file)
	99	{
	100	struct usb_lcd *dev;
	101
	102	dev = (struct usb_lcd *)file->private_data;
	103	if (dev == NULL)
	104	return -ENODEV;
	105
	106	/* decrement the count on our device */
	107	kref_put(&dev->kref, lcd_delete);
	108	return 0;
	109	}
	110
	111	static ssize_t lcd_read(struct file file, char __user buffer, size_t count, loff_t *ppos)
	112	{
	113	struct usb_lcd *dev;
	114	int retval = 0;
	115	int bytes_read;
	116
	117	dev = (struct usb_lcd *)file->private_data;
	118
	119	/* do a blocking bulk read to get data from the device */
	120	retval = usb_bulk_msg(dev->udev,
	121	usb_rcvbulkpipe(dev->udev, dev->bulk_in_endpointAddr),
	122	dev->bulk_in_buffer,
	123	min(dev->bulk_in_size, count),
	124	&bytes_read, 10000);
	125
	126	/* if the read was successful, copy the data to userspace */
	127	if (!retval) {
	128	if (copy_to_user(buffer, dev->bulk_in_buffer, bytes_read))
	129	retval = -EFAULT;
	130	else
	131	retval = bytes_read;
	132	}
	133
	134	return retval;
	135	}
	136
	137	static int lcd_ioctl(struct inode inode, struct file file, unsigned int cmd, unsigned long arg)
	138	{
	139	struct usb_lcd *dev;
	140	u16 bcdDevice;
	141	char buf[30];
	142
	143	dev = (struct usb_lcd *)file->private_data;
	144	if (dev == NULL)
	145	return -ENODEV;
	146
	147	switch (cmd) {
	148	case IOCTL_GET_HARD_VERSION:
	149	bcdDevice = le16_to_cpu((dev->udev)->descriptor.bcdDevice);
	150	sprintf(buf,"%1d%1d.%1d%1d",
	151	(bcdDevice & 0xF000)>>12,
	152	(bcdDevice & 0xF00)>>8,
	153	(bcdDevice & 0xF0)>>4,
	154	(bcdDevice & 0xF));
	155	if (copy_to_user((void __user *)arg,buf,strlen(buf))!=0)
	156	return -EFAULT;
	157	break;
	158	case IOCTL_GET_DRV_VERSION:
159	sprintf(buf,DRIVER_VERSION);
160	if (copy_to_user((void __user *)arg,buf,strlen(buf))!=0)
161	return -EFAULT;
162	break;
163	default:
164	return -ENOTTY;
165	break;
166	}
167
168	return 0;
169	}
170
7d12e780	171	static void lcd_write_bulk_callback(struct urb *urb)
1da177e4 LT	172	{
	173	struct usb_lcd *dev;
	174
	175	dev = (struct usb_lcd *)urb->context;
	176
	177	/* sync/async unlink faults aren't errors */
	178	if (urb->status &&
	179	!(urb->status == -ENOENT \|\|
	180	urb->status == -ECONNRESET \|\|
	181	urb->status == -ESHUTDOWN)) {
	182	dbg("USBLCD: %s - nonzero write bulk status received: %d",
	183	__FUNCTION__, urb->status);
	184	}
	185
	186	/* free up our allocated buffer */
	187	usb_buffer_free(urb->dev, urb->transfer_buffer_length,
	188	urb->transfer_buffer, urb->transfer_dma);
	189	}
	190
	191	static ssize_t lcd_write(struct file file, const char __user user_buffer, size_t count, loff_t *ppos)
	192	{
	193	struct usb_lcd *dev;
	194	int retval = 0;
	195	struct urb *urb = NULL;
	196	char *buf = NULL;
	197
	198	dev = (struct usb_lcd *)file->private_data;
	199
	200	/* verify that we actually have some data to write */
	201	if (count == 0)
	202	goto exit;
	203
	204	/* create a urb, and a buffer for it, and copy the data to the urb */
	205	urb = usb_alloc_urb(0, GFP_KERNEL);
053be305 ES	206	if (!urb)
053be305 ES	207	return -ENOMEM;
1da177e4 LT	208
	209	buf = usb_buffer_alloc(dev->udev, count, GFP_KERNEL, &urb->transfer_dma);
	210	if (!buf) {
	211	retval = -ENOMEM;
	212	goto error;
	213	}
	214
	215	if (copy_from_user(buf, user_buffer, count)) {
	216	retval = -EFAULT;
	217	goto error;
	218	}
	219
	220	/* initialize the urb properly */
	221	usb_fill_bulk_urb(urb, dev->udev,
	222	usb_sndbulkpipe(dev->udev, dev->bulk_out_endpointAddr),
	223	buf, count, lcd_write_bulk_callback, dev);
	224	urb->transfer_flags \|= URB_NO_TRANSFER_DMA_MAP;
	225
	226	/* send the data out the bulk port */
	227	retval = usb_submit_urb(urb, GFP_KERNEL);
	228	if (retval) {
	229	err("USBLCD: %s - failed submitting write urb, error %d", __FUNCTION__, retval);
	230	goto error;
	231	}
	232
	233	/* release our reference to this urb, the USB core will eventually free it entirely */
	234	usb_free_urb(urb);
	235
	236	exit:
	237	return count;
	238
	239	error:
	240	usb_buffer_free(dev->udev, count, buf, urb->transfer_dma);
	241	usb_free_urb(urb);
	242	return retval;
	243	}
	244
066202dd	245	static const struct file_operations lcd_fops = {
1da177e4 LT	246	.owner = THIS_MODULE,
	247	.read = lcd_read,
	248	.write = lcd_write,
	249	.open = lcd_open,
	250	.ioctl = lcd_ioctl,
	251	.release = lcd_release,
	252	};
	253
	254	/*
d6e5bcf4 GKH	255	* usb class driver info in order to get a minor number from the usb core,
	256	* and to have the device registered with the driver core
	257	*/
1da177e4	258	static struct usb_class_driver lcd_class = {
d6e5bcf4	259	.name = "lcd%d",
1da177e4	260	.fops = &lcd_fops,
1da177e4 LT	261	.minor_base = USBLCD_MINOR,
	262	};
	263
	264	static int lcd_probe(struct usb_interface interface, const struct usb_device_id id)
	265	{
	266	struct usb_lcd *dev = NULL;
	267	struct usb_host_interface *iface_desc;
	268	struct usb_endpoint_descriptor *endpoint;
	269	size_t buffer_size;
	270	int i;
	271	int retval = -ENOMEM;
	272
	273	/* allocate memory for our device state and initialize it */
80b6ca48	274	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1da177e4 LT	275	if (dev == NULL) {
	276	err("Out of memory");
	277	goto error;
	278	}
1da177e4 LT	279	kref_init(&dev->kref);
	280
	281	dev->udev = usb_get_dev(interface_to_usbdev(interface));
	282	dev->interface = interface;
	283
	284	if (le16_to_cpu(dev->udev->descriptor.idProduct) != 0x0001) {
	285	warn(KERN_INFO "USBLCD model not supported.");
	286	return -ENODEV;
	287	}
	288
	289	/* set up the endpoint information */
	290	/* use only the first bulk-in and bulk-out endpoints */
	291	iface_desc = interface->cur_altsetting;
	292	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
	293	endpoint = &iface_desc->endpoint[i].desc;
	294
	295	if (!dev->bulk_in_endpointAddr &&
b0b660b8	296	usb_endpoint_is_bulk_in(endpoint)) {
1da177e4 LT	297	/* we found a bulk in endpoint */
	298	buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
	299	dev->bulk_in_size = buffer_size;
	300	dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
	301	dev->bulk_in_buffer = kmalloc(buffer_size, GFP_KERNEL);
	302	if (!dev->bulk_in_buffer) {
	303	err("Could not allocate bulk_in_buffer");
	304	goto error;
	305	}
	306	}
	307
	308	if (!dev->bulk_out_endpointAddr &&
b0b660b8	309	usb_endpoint_is_bulk_out(endpoint)) {
1da177e4 LT	310	/* we found a bulk out endpoint */
	311	dev->bulk_out_endpointAddr = endpoint->bEndpointAddress;
	312	}
	313	}
	314	if (!(dev->bulk_in_endpointAddr && dev->bulk_out_endpointAddr)) {
	315	err("Could not find both bulk-in and bulk-out endpoints");
	316	goto error;
	317	}
	318
	319	/* save our data pointer in this interface device */
	320	usb_set_intfdata(interface, dev);
	321
	322	/* we can register the device now, as it is ready */
	323	retval = usb_register_dev(interface, &lcd_class);
	324	if (retval) {
	325	/* something prevented us from registering this driver */
	326	err("Not able to get a minor for this device.");
	327	usb_set_intfdata(interface, NULL);
	328	goto error;
	329	}
	330
	331	i = le16_to_cpu(dev->udev->descriptor.bcdDevice);
	332
	333	info("USBLCD Version %1d%1d.%1d%1d found at address %d",
	334	(i & 0xF000)>>12,(i & 0xF00)>>8,(i & 0xF0)>>4,(i & 0xF),
	335	dev->udev->devnum);
	336
	337	/* let the user know what node this device is now attached to */
	338	info("USB LCD device now attached to USBLCD-%d", interface->minor);
	339	return 0;
	340
	341	error:
	342	if (dev)
	343	kref_put(&dev->kref, lcd_delete);
	344	return retval;
	345	}
	346
	347	static void lcd_disconnect(struct usb_interface *interface)
	348	{
	349	struct usb_lcd *dev;
	350	int minor = interface->minor;
	351
	352	/* prevent skel_open() from racing skel_disconnect() */
2e85c91e	353	mutex_lock(&usb_lcd_open_mutex);
1da177e4 LT	354
	355	dev = usb_get_intfdata(interface);
	356	usb_set_intfdata(interface, NULL);
	357
	358	/* give back our minor */
	359	usb_deregister_dev(interface, &lcd_class);
	360
2e85c91e	361	mutex_unlock(&usb_lcd_open_mutex);
1da177e4 LT	362
	363	/* decrement our usage count */
	364	kref_put(&dev->kref, lcd_delete);
	365
	366	info("USB LCD #%d now disconnected", minor);
	367	}
	368
	369	static struct usb_driver lcd_driver = {
1da177e4 LT	370	.name = "usblcd",
	371	.probe = lcd_probe,
	372	.disconnect = lcd_disconnect,
	373	.id_table = id_table,
	374	};
	375
	376	static int __init usb_lcd_init(void)
	377	{
	378	int result;
	379
	380	result = usb_register(&lcd_driver);
	381	if (result)
	382	err("usb_register failed. Error number %d", result);
	383
	384	return result;
	385	}
	386
	387
	388	static void __exit usb_lcd_exit(void)
	389	{
	390	usb_deregister(&lcd_driver);
	391	}
	392
	393	module_init(usb_lcd_init);
	394	module_exit(usb_lcd_exit);
	395
	396	MODULE_AUTHOR("Georges Toth <g.toth@e-biz.lu>");
	397	MODULE_DESCRIPTION(DRIVER_VERSION);
	398	MODULE_LICENSE("GPL");