[GitHub/MotorolaMobilityLLC/kernel-slsi.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;
	struct semaphore	limit_sem;		/* to stop writes at full throttle from
							 * using up all RAM */
	struct usb_anchor	submitted;		/* URBs to wait for before suspend */
};
#define to_lcd_dev(d) container_of(d, struct usb_lcd, kref)

#define USB_LCD_CONCURRENT_WRITES	5

static struct usb_driver lcd_driver;


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, r;

	subminor = iminor(inode);

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

	dev = usb_get_intfdata(interface);
	if (!dev)
		return -ENODEV;

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

	/* grab a power reference */
	r = usb_autopm_get_interface(interface);
	if (r < 0) {
		kref_put(&dev->kref, lcd_delete);
		return r;
	}

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

	return 0;
}

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 */
	usb_autopm_put_interface(dev->interface);
	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;
	int status = urb->status;

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

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

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

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, r;
	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;

	r = down_interruptible(&dev->limit_sem);
	if (r < 0)
		return -EINTR;

	/* create a urb, and a buffer for it, and copy the data to the urb */
	urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!urb) {
		retval = -ENOMEM;
		goto err_no_buf;
	}
	
	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;

	usb_anchor_urb(urb, &dev->submitted);
	
	/* 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_unanchor;
	}
	
	/* release our reference to this urb, the USB core will eventually free it entirely */
	usb_free_urb(urb);

exit:
	return count;
error_unanchor:
	usb_unanchor_urb(urb);
error:
	usb_buffer_free(dev->udev, count, buf, urb->transfer_dma);
	usb_free_urb(urb);
err_no_buf:
	up(&dev->limit_sem);
	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);
	sema_init(&dev->limit_sem, USB_LCD_CONCURRENT_WRITES);
	init_usb_anchor(&dev->submitted);

	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_draw_down(struct usb_lcd *dev)
{
	int time;

	time = usb_wait_anchor_empty_timeout(&dev->submitted, 1000);
	if (!time)
		usb_kill_anchored_urbs(&dev->submitted);
}

static int lcd_suspend(struct usb_interface *intf, pm_message_t message)
{
	struct usb_lcd *dev = usb_get_intfdata(intf);

	if (!dev)
		return 0;
	lcd_draw_down(dev);
	return 0;
}

static int lcd_resume (struct usb_interface *intf)
{
	return 0;
}

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

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

        /* give back our minor */
        usb_deregister_dev(interface, &lcd_class);
 
	/* 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,
	.suspend =	lcd_suspend,
	.resume =	lcd_resume,
	.id_table =	id_table,
	.supports_autosuspend = 1,
};

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 */
5afeb104 ON	45	struct kref kref;
	46	struct semaphore limit_sem; /* to stop writes at full throttle from
	47	* using up all RAM */
7bbe990c	48	struct usb_anchor submitted; /* URBs to wait for before suspend */
1da177e4 LT	49	};
	50	#define to_lcd_dev(d) container_of(d, struct usb_lcd, kref)
	51
5afeb104 ON	52	#define USB_LCD_CONCURRENT_WRITES 5
5afeb104 ON	53
1da177e4 LT	54	static struct usb_driver lcd_driver;
	55
	56
	57	static void lcd_delete(struct kref *kref)
	58	{
	59	struct usb_lcd *dev = to_lcd_dev(kref);
	60
	61	usb_put_dev(dev->udev);
	62	kfree (dev->bulk_in_buffer);
	63	kfree (dev);
	64	}
	65
	66
	67	static int lcd_open(struct inode inode, struct file file)
	68	{
	69	struct usb_lcd *dev;
	70	struct usb_interface *interface;
7bbe990c	71	int subminor, r;
1da177e4 LT	72
	73	subminor = iminor(inode);
	74
	75	interface = usb_find_interface(&lcd_driver, subminor);
	76	if (!interface) {
	77	err ("USBLCD: %s - error, can't find device for minor %d",
	78	__FUNCTION__, subminor);
d4ead16f	79	return -ENODEV;
1da177e4 LT	80	}
	81
	82	dev = usb_get_intfdata(interface);
d4ead16f AS	83	if (!dev)
d4ead16f AS	84	return -ENODEV;
1da177e4 LT	85
	86	/* increment our usage count for the device */
	87	kref_get(&dev->kref);
	88
7bbe990c ON	89	/* grab a power reference */
	90	r = usb_autopm_get_interface(interface);
	91	if (r < 0) {
	92	kref_put(&dev->kref, lcd_delete);
	93	return r;
	94	}
	95
1da177e4 LT	96	/* save our object in the file's private structure */
	97	file->private_data = dev;
	98
d4ead16f	99	return 0;
1da177e4 LT	100	}
	101
	102	static int lcd_release(struct inode inode, struct file file)
	103	{
	104	struct usb_lcd *dev;
	105
	106	dev = (struct usb_lcd *)file->private_data;
	107	if (dev == NULL)
	108	return -ENODEV;
	109
	110	/* decrement the count on our device */
7bbe990c	111	usb_autopm_put_interface(dev->interface);
1da177e4 LT	112	kref_put(&dev->kref, lcd_delete);
	113	return 0;
	114	}
	115
	116	static ssize_t lcd_read(struct file file, char __user buffer, size_t count, loff_t *ppos)
	117	{
	118	struct usb_lcd *dev;
	119	int retval = 0;
	120	int bytes_read;
	121
	122	dev = (struct usb_lcd *)file->private_data;
	123
	124	/* do a blocking bulk read to get data from the device */
	125	retval = usb_bulk_msg(dev->udev,
	126	usb_rcvbulkpipe(dev->udev, dev->bulk_in_endpointAddr),
	127	dev->bulk_in_buffer,
	128	min(dev->bulk_in_size, count),
	129	&bytes_read, 10000);
	130
	131	/* if the read was successful, copy the data to userspace */
	132	if (!retval) {
	133	if (copy_to_user(buffer, dev->bulk_in_buffer, bytes_read))
	134	retval = -EFAULT;
	135	else
	136	retval = bytes_read;
	137	}
	138
	139	return retval;
	140	}
	141
	142	static int lcd_ioctl(struct inode inode, struct file file, unsigned int cmd, unsigned long arg)
	143	{
	144	struct usb_lcd *dev;
	145	u16 bcdDevice;
	146	char buf[30];
	147
	148	dev = (struct usb_lcd *)file->private_data;
	149	if (dev == NULL)
	150	return -ENODEV;
	151
	152	switch (cmd) {
	153	case IOCTL_GET_HARD_VERSION:
	154	bcdDevice = le16_to_cpu((dev->udev)->descriptor.bcdDevice);
	155	sprintf(buf,"%1d%1d.%1d%1d",
	156	(bcdDevice & 0xF000)>>12,
	157	(bcdDevice & 0xF00)>>8,
	158	(bcdDevice & 0xF0)>>4,
	159	(bcdDevice & 0xF));
	160	if (copy_to_user((void __user *)arg,buf,strlen(buf))!=0)
	161	return -EFAULT;
	162	break;
	163	case IOCTL_GET_DRV_VERSION:
	164	sprintf(buf,DRIVER_VERSION);
	165	if (copy_to_user((void __user *)arg,buf,strlen(buf))!=0)
	166	return -EFAULT;
	167	break;
	168	default:
	169	return -ENOTTY;
	170	break;
	171	}
	172
	173	return 0;
	174	}
	175
7d12e780	176	static void lcd_write_bulk_callback(struct urb *urb)
1da177e4 LT	177	{
1da177e4 LT	178	struct usb_lcd *dev;
0723af13	179	int status = urb->status;
1da177e4 LT	180
	181	dev = (struct usb_lcd *)urb->context;
	182
	183	/* sync/async unlink faults aren't errors */
0723af13 GKH	184	if (status &&
	185	!(status == -ENOENT \|\|
	186	status == -ECONNRESET \|\|
	187	status == -ESHUTDOWN)) {
1da177e4	188	dbg("USBLCD: %s - nonzero write bulk status received: %d",
0723af13	189	__FUNCTION__, status);
1da177e4 LT	190	}
	191
	192	/* free up our allocated buffer */
	193	usb_buffer_free(urb->dev, urb->transfer_buffer_length,
	194	urb->transfer_buffer, urb->transfer_dma);
5afeb104	195	up(&dev->limit_sem);
1da177e4 LT	196	}
	197
	198	static ssize_t lcd_write(struct file file, const char __user user_buffer, size_t count, loff_t *ppos)
	199	{
	200	struct usb_lcd *dev;
5afeb104	201	int retval = 0, r;
1da177e4 LT	202	struct urb *urb = NULL;
	203	char *buf = NULL;
	204
	205	dev = (struct usb_lcd *)file->private_data;
	206
	207	/* verify that we actually have some data to write */
	208	if (count == 0)
	209	goto exit;
	210
5afeb104 ON	211	r = down_interruptible(&dev->limit_sem);
	212	if (r < 0)
	213	return -EINTR;
	214
1da177e4 LT	215	/* create a urb, and a buffer for it, and copy the data to the urb */
1da177e4 LT	216	urb = usb_alloc_urb(0, GFP_KERNEL);
5afeb104 ON	217	if (!urb) {
	218	retval = -ENOMEM;
	219	goto err_no_buf;
	220	}
1da177e4 LT	221
	222	buf = usb_buffer_alloc(dev->udev, count, GFP_KERNEL, &urb->transfer_dma);
	223	if (!buf) {
	224	retval = -ENOMEM;
	225	goto error;
	226	}
	227
	228	if (copy_from_user(buf, user_buffer, count)) {
	229	retval = -EFAULT;
	230	goto error;
	231	}
	232
	233	/* initialize the urb properly */
	234	usb_fill_bulk_urb(urb, dev->udev,
	235	usb_sndbulkpipe(dev->udev, dev->bulk_out_endpointAddr),
	236	buf, count, lcd_write_bulk_callback, dev);
	237	urb->transfer_flags \|= URB_NO_TRANSFER_DMA_MAP;
7bbe990c ON	238
7bbe990c ON	239	usb_anchor_urb(urb, &dev->submitted);
1da177e4 LT	240
	241	/* send the data out the bulk port */
	242	retval = usb_submit_urb(urb, GFP_KERNEL);
	243	if (retval) {
	244	err("USBLCD: %s - failed submitting write urb, error %d", __FUNCTION__, retval);
7bbe990c	245	goto error_unanchor;
1da177e4 LT	246	}
	247
	248	/* release our reference to this urb, the USB core will eventually free it entirely */
	249	usb_free_urb(urb);
	250
	251	exit:
	252	return count;
7bbe990c ON	253	error_unanchor:
7bbe990c ON	254	usb_unanchor_urb(urb);
1da177e4 LT	255	error:
	256	usb_buffer_free(dev->udev, count, buf, urb->transfer_dma);
	257	usb_free_urb(urb);
5afeb104 ON	258	err_no_buf:
5afeb104 ON	259	up(&dev->limit_sem);
1da177e4 LT	260	return retval;
	261	}
	262
066202dd	263	static const struct file_operations lcd_fops = {
1da177e4 LT	264	.owner = THIS_MODULE,
	265	.read = lcd_read,
	266	.write = lcd_write,
	267	.open = lcd_open,
	268	.ioctl = lcd_ioctl,
	269	.release = lcd_release,
	270	};
	271
	272	/*
d6e5bcf4 GKH	273	* usb class driver info in order to get a minor number from the usb core,
	274	* and to have the device registered with the driver core
	275	*/
1da177e4	276	static struct usb_class_driver lcd_class = {
d6e5bcf4	277	.name = "lcd%d",
1da177e4	278	.fops = &lcd_fops,
1da177e4 LT	279	.minor_base = USBLCD_MINOR,
	280	};
	281
	282	static int lcd_probe(struct usb_interface interface, const struct usb_device_id id)
	283	{
	284	struct usb_lcd *dev = NULL;
	285	struct usb_host_interface *iface_desc;
	286	struct usb_endpoint_descriptor *endpoint;
	287	size_t buffer_size;
	288	int i;
	289	int retval = -ENOMEM;
	290
	291	/* allocate memory for our device state and initialize it */
80b6ca48	292	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1da177e4 LT	293	if (dev == NULL) {
	294	err("Out of memory");
	295	goto error;
	296	}
1da177e4	297	kref_init(&dev->kref);
5afeb104	298	sema_init(&dev->limit_sem, USB_LCD_CONCURRENT_WRITES);
7bbe990c	299	init_usb_anchor(&dev->submitted);
1da177e4 LT	300
	301	dev->udev = usb_get_dev(interface_to_usbdev(interface));
	302	dev->interface = interface;
	303
	304	if (le16_to_cpu(dev->udev->descriptor.idProduct) != 0x0001) {
	305	warn(KERN_INFO "USBLCD model not supported.");
	306	return -ENODEV;
	307	}
	308
	309	/* set up the endpoint information */
	310	/* use only the first bulk-in and bulk-out endpoints */
	311	iface_desc = interface->cur_altsetting;
	312	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
	313	endpoint = &iface_desc->endpoint[i].desc;
	314
	315	if (!dev->bulk_in_endpointAddr &&
b0b660b8	316	usb_endpoint_is_bulk_in(endpoint)) {
1da177e4 LT	317	/* we found a bulk in endpoint */
	318	buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
	319	dev->bulk_in_size = buffer_size;
	320	dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
	321	dev->bulk_in_buffer = kmalloc(buffer_size, GFP_KERNEL);
	322	if (!dev->bulk_in_buffer) {
	323	err("Could not allocate bulk_in_buffer");
	324	goto error;
	325	}
	326	}
	327
	328	if (!dev->bulk_out_endpointAddr &&
b0b660b8	329	usb_endpoint_is_bulk_out(endpoint)) {
1da177e4 LT	330	/* we found a bulk out endpoint */
	331	dev->bulk_out_endpointAddr = endpoint->bEndpointAddress;
	332	}
	333	}
	334	if (!(dev->bulk_in_endpointAddr && dev->bulk_out_endpointAddr)) {
	335	err("Could not find both bulk-in and bulk-out endpoints");
	336	goto error;
	337	}
	338
	339	/* save our data pointer in this interface device */
	340	usb_set_intfdata(interface, dev);
	341
	342	/* we can register the device now, as it is ready */
	343	retval = usb_register_dev(interface, &lcd_class);
	344	if (retval) {
	345	/* something prevented us from registering this driver */
	346	err("Not able to get a minor for this device.");
	347	usb_set_intfdata(interface, NULL);
	348	goto error;
	349	}
	350
	351	i = le16_to_cpu(dev->udev->descriptor.bcdDevice);
	352
	353	info("USBLCD Version %1d%1d.%1d%1d found at address %d",
	354	(i & 0xF000)>>12,(i & 0xF00)>>8,(i & 0xF0)>>4,(i & 0xF),
	355	dev->udev->devnum);
	356
	357	/* let the user know what node this device is now attached to */
	358	info("USB LCD device now attached to USBLCD-%d", interface->minor);
	359	return 0;
	360
	361	error:
	362	if (dev)
	363	kref_put(&dev->kref, lcd_delete);
	364	return retval;
	365	}
	366
7bbe990c ON	367	static void lcd_draw_down(struct usb_lcd *dev)
	368	{
	369	int time;
	370
	371	time = usb_wait_anchor_empty_timeout(&dev->submitted, 1000);
	372	if (!time)
	373	usb_kill_anchored_urbs(&dev->submitted);
	374	}
	375
	376	static int lcd_suspend(struct usb_interface *intf, pm_message_t message)
	377	{
	378	struct usb_lcd *dev = usb_get_intfdata(intf);
	379
	380	if (!dev)
	381	return 0;
	382	lcd_draw_down(dev);
	383	return 0;
	384	}
	385
	386	static int lcd_resume (struct usb_interface *intf)
	387	{
	388	return 0;
	389	}
	390
1da177e4 LT	391	static void lcd_disconnect(struct usb_interface *interface)
	392	{
	393	struct usb_lcd *dev;
	394	int minor = interface->minor;
	395
1da177e4 LT	396	dev = usb_get_intfdata(interface);
	397	usb_set_intfdata(interface, NULL);
	398
	399	/* give back our minor */
	400	usb_deregister_dev(interface, &lcd_class);
	401
1da177e4 LT	402	/* decrement our usage count */
	403	kref_put(&dev->kref, lcd_delete);
	404
	405	info("USB LCD #%d now disconnected", minor);
	406	}
	407
	408	static struct usb_driver lcd_driver = {
1da177e4 LT	409	.name = "usblcd",
	410	.probe = lcd_probe,
	411	.disconnect = lcd_disconnect,
7bbe990c ON	412	.suspend = lcd_suspend,
7bbe990c ON	413	.resume = lcd_resume,
1da177e4	414	.id_table = id_table,
7bbe990c	415	.supports_autosuspend = 1,
1da177e4 LT	416	};
	417
	418	static int __init usb_lcd_init(void)
	419	{
	420	int result;
	421
	422	result = usb_register(&lcd_driver);
	423	if (result)
	424	err("usb_register failed. Error number %d", result);
	425
	426	return result;
	427	}
	428
	429
	430	static void __exit usb_lcd_exit(void)
	431	{
	432	usb_deregister(&lcd_driver);
	433	}
	434
	435	module_init(usb_lcd_init);
	436	module_exit(usb_lcd_exit);
	437
	438	MODULE_AUTHOR("Georges Toth <g.toth@e-biz.lu>");
	439	MODULE_DESCRIPTION(DRIVER_VERSION);
	440	MODULE_LICENSE("GPL");