[mirror_ubuntu-hirsute-kernel.git] / drivers / usb / misc / idmouse.c

/* Siemens ID Mouse driver v0.6

  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.

  Copyright (C) 2004-5 by Florian 'Floe' Echtler  <echtler@fs.tum.de>
                      and Andreas  'ad'  Deresch <aderesch@fs.tum.de>

  Derived from the USB Skeleton driver 1.1,
  Copyright (C) 2003 Greg Kroah-Hartman (greg@kroah.com)

  Additional information provided by Martin Reising
  <Martin.Reising@natural-computing.de>

*/

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/completion.h>
#include <linux/mutex.h>
#include <asm/uaccess.h>
#include <linux/usb.h>

/* image constants */
#define WIDTH 225
#define HEIGHT 289
#define HEADER "P5 225 289 255 "
#define IMGSIZE ((WIDTH * HEIGHT) + sizeof(HEADER)-1)

/* version information */
#define DRIVER_VERSION "0.6"
#define DRIVER_SHORT   "idmouse"
#define DRIVER_AUTHOR  "Florian 'Floe' Echtler <echtler@fs.tum.de>"
#define DRIVER_DESC    "Siemens ID Mouse FingerTIP Sensor Driver"

/* minor number for misc USB devices */
#define USB_IDMOUSE_MINOR_BASE 132

/* vendor and device IDs */
#define ID_SIEMENS 0x0681
#define ID_IDMOUSE 0x0005
#define ID_CHERRY  0x0010

/* device ID table */
static struct usb_device_id idmouse_table[] = {
	{USB_DEVICE(ID_SIEMENS, ID_IDMOUSE)}, /* Siemens ID Mouse (Professional) */
	{USB_DEVICE(ID_SIEMENS, ID_CHERRY )}, /* Cherry FingerTIP ID Board       */
	{}                                    /* terminating null entry          */
};

/* sensor commands */
#define FTIP_RESET   0x20
#define FTIP_ACQUIRE 0x21
#define FTIP_RELEASE 0x22
#define FTIP_BLINK   0x23  /* LSB of value = blink pulse width */
#define FTIP_SCROLL  0x24

#define ftip_command(dev, command, value, index) \
	usb_control_msg (dev->udev, usb_sndctrlpipe (dev->udev, 0), command, \
	USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT, value, index, NULL, 0, 1000)

MODULE_DEVICE_TABLE(usb, idmouse_table);
static DEFINE_MUTEX(open_disc_mutex);

/* structure to hold all of our device specific stuff */
struct usb_idmouse {

	struct usb_device *udev; /* save off the usb device pointer */
	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 maximum bulk packet size */
	size_t orig_bi_size; /* same as above, but reported by the device */
	__u8 bulk_in_endpointAddr; /* the address of the bulk in endpoint */

	int open; /* if the port is open or not */
	int present; /* if the device is not disconnected */
	struct mutex lock; /* locks this structure */

};

/* local function prototypes */
static ssize_t idmouse_read(struct file *file, char __user *buffer,
				size_t count, loff_t * ppos);

static int idmouse_open(struct inode *inode, struct file *file);
static int idmouse_release(struct inode *inode, struct file *file);

static int idmouse_probe(struct usb_interface *interface,
				const struct usb_device_id *id);

static void idmouse_disconnect(struct usb_interface *interface);

/* file operation pointers */
static const struct file_operations idmouse_fops = {
	.owner = THIS_MODULE,
	.read = idmouse_read,
	.open = idmouse_open,
	.release = idmouse_release,
};

/* class driver information */
static struct usb_class_driver idmouse_class = {
	.name = "idmouse%d",
	.fops = &idmouse_fops,
	.minor_base = USB_IDMOUSE_MINOR_BASE,
};

/* usb specific object needed to register this driver with the usb subsystem */
static struct usb_driver idmouse_driver = {
	.name = DRIVER_SHORT,
	.probe = idmouse_probe,
	.disconnect = idmouse_disconnect,
	.id_table = idmouse_table,
};

static int idmouse_create_image(struct usb_idmouse *dev)
{
	int bytes_read;
	int bulk_read;
	int result;

	memcpy(dev->bulk_in_buffer, HEADER, sizeof(HEADER)-1);
	bytes_read = sizeof(HEADER)-1;

	/* reset the device and set a fast blink rate */
	result = ftip_command(dev, FTIP_RELEASE, 0, 0);
	if (result < 0)
		goto reset;
	result = ftip_command(dev, FTIP_BLINK,   1, 0);
	if (result < 0)
		goto reset;

	/* initialize the sensor - sending this command twice */
	/* significantly reduces the rate of failed reads     */
	result = ftip_command(dev, FTIP_ACQUIRE, 0, 0);
	if (result < 0)
		goto reset;
	result = ftip_command(dev, FTIP_ACQUIRE, 0, 0);
	if (result < 0)
		goto reset;

	/* start the readout - sending this command twice */
	/* presumably enables the high dynamic range mode */
	result = ftip_command(dev, FTIP_RESET,   0, 0);
	if (result < 0)
		goto reset;
	result = ftip_command(dev, FTIP_RESET,   0, 0);
	if (result < 0)
		goto reset;

	/* loop over a blocking bulk read to get data from the device */
	while (bytes_read < IMGSIZE) {
		result = usb_bulk_msg (dev->udev,
				usb_rcvbulkpipe (dev->udev, dev->bulk_in_endpointAddr),
				dev->bulk_in_buffer + bytes_read,
				dev->bulk_in_size, &bulk_read, 5000);
		if (result < 0) {
			/* Maybe this error was caused by the increased packet size? */
			/* Reset to the original value and tell userspace to retry.  */
			if (dev->bulk_in_size != dev->orig_bi_size) {
				dev->bulk_in_size = dev->orig_bi_size;
				result = -EAGAIN;
			}
			break;
		}
		if (signal_pending(current)) {
			result = -EINTR;
			break;
		}
		bytes_read += bulk_read;
	}

	/* reset the device */
reset:
	ftip_command(dev, FTIP_RELEASE, 0, 0);

	/* check for valid image */
	/* right border should be black (0x00) */
	for (bytes_read = sizeof(HEADER)-1 + WIDTH-1; bytes_read < IMGSIZE; bytes_read += WIDTH)
		if (dev->bulk_in_buffer[bytes_read] != 0x00)
			return -EAGAIN;

	/* lower border should be white (0xFF) */
	for (bytes_read = IMGSIZE-WIDTH; bytes_read < IMGSIZE-1; bytes_read++)
		if (dev->bulk_in_buffer[bytes_read] != 0xFF)
			return -EAGAIN;

	/* should be IMGSIZE == 65040 */
	dbg("read %d bytes fingerprint data", bytes_read);
	return result;
}

static inline void idmouse_delete(struct usb_idmouse *dev)
{
	kfree(dev->bulk_in_buffer);
	kfree(dev);
}

static int idmouse_open(struct inode *inode, struct file *file)
{
	struct usb_idmouse *dev;
	struct usb_interface *interface;
	int result;

	/* get the interface from minor number and driver information */
	interface = usb_find_interface (&idmouse_driver, iminor (inode));
	if (!interface)
		return -ENODEV;

	mutex_lock(&open_disc_mutex);
	/* get the device information block from the interface */
	dev = usb_get_intfdata(interface);
	if (!dev) {
		mutex_unlock(&open_disc_mutex);
		return -ENODEV;
	}

	/* lock this device */
	mutex_lock(&dev->lock);
	mutex_unlock(&open_disc_mutex);

	/* check if already open */
	if (dev->open) {

		/* already open, so fail */
		result = -EBUSY;

	} else {

		/* create a new image and check for success */
		result = idmouse_create_image (dev);
		if (result)
			goto error;

		/* increment our usage count for the driver */
		++dev->open;

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

	} 

error:

	/* unlock this device */
	mutex_unlock(&dev->lock);
	return result;
}

static int idmouse_release(struct inode *inode, struct file *file)
{
	struct usb_idmouse *dev;

	dev = file->private_data;

	if (dev == NULL)
		return -ENODEV;

	mutex_lock(&open_disc_mutex);
	/* lock our device */
	mutex_lock(&dev->lock);

	/* are we really open? */
	if (dev->open <= 0) {
		mutex_unlock(&dev->lock);
		mutex_unlock(&open_disc_mutex);
		return -ENODEV;
	}

	--dev->open;

	if (!dev->present) {
		/* the device was unplugged before the file was released */
		mutex_unlock(&dev->lock);
		mutex_unlock(&open_disc_mutex);
		idmouse_delete(dev);
	} else {
		mutex_unlock(&dev->lock);
		mutex_unlock(&open_disc_mutex);
	}
	return 0;
}

static ssize_t idmouse_read(struct file *file, char __user *buffer, size_t count,
				loff_t * ppos)
{
	struct usb_idmouse *dev = file->private_data;
	int result;

	/* lock this object */
	mutex_lock(&dev->lock);

	/* verify that the device wasn't unplugged */
	if (!dev->present) {
		mutex_unlock(&dev->lock);
		return -ENODEV;
	}

	result = simple_read_from_buffer(buffer, count, ppos,
					dev->bulk_in_buffer, IMGSIZE);
	/* unlock the device */
	mutex_unlock(&dev->lock);
	return result;
}

static int idmouse_probe(struct usb_interface *interface,
				const struct usb_device_id *id)
{
	struct usb_device *udev = interface_to_usbdev(interface);
	struct usb_idmouse *dev;
	struct usb_host_interface *iface_desc;
	struct usb_endpoint_descriptor *endpoint;
	int result;

	/* check if we have gotten the data or the hid interface */
	iface_desc = &interface->altsetting[0];
	if (iface_desc->desc.bInterfaceClass != 0x0A)
		return -ENODEV;

	/* allocate memory for our device state and initialize it */
	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
	if (dev == NULL)
		return -ENOMEM;

	mutex_init(&dev->lock);
	dev->udev = udev;
	dev->interface = interface;

	/* set up the endpoint information - use only the first bulk-in endpoint */
	endpoint = &iface_desc->endpoint[0].desc;
	if (!dev->bulk_in_endpointAddr && usb_endpoint_is_bulk_in(endpoint)) {
		/* we found a bulk in endpoint */
		dev->orig_bi_size = le16_to_cpu(endpoint->wMaxPacketSize);
		dev->bulk_in_size = 0x200; /* works _much_ faster */
		dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
		dev->bulk_in_buffer =
			kmalloc(IMGSIZE + dev->bulk_in_size, GFP_KERNEL);

		if (!dev->bulk_in_buffer) {
			err("Unable to allocate input buffer.");
			idmouse_delete(dev);
			return -ENOMEM;
		}
	}

	if (!(dev->bulk_in_endpointAddr)) {
		err("Unable to find bulk-in endpoint.");
		idmouse_delete(dev);
		return -ENODEV;
	}
	/* allow device read, write and ioctl */
	dev->present = 1;

	/* we can register the device now, as it is ready */
	usb_set_intfdata(interface, dev);
	result = usb_register_dev(interface, &idmouse_class);
	if (result) {
		/* something prevented us from registering this device */
		err("Unble to allocate minor number.");
		usb_set_intfdata(interface, NULL);
		idmouse_delete(dev);
		return result;
	}

	/* be noisy */
	dev_info(&interface->dev,"%s now attached\n",DRIVER_DESC);

	return 0;
}

static void idmouse_disconnect(struct usb_interface *interface)
{
	struct usb_idmouse *dev;

	/* get device structure */
	dev = usb_get_intfdata(interface);

	/* give back our minor */
	usb_deregister_dev(interface, &idmouse_class);

	mutex_lock(&open_disc_mutex);
	usb_set_intfdata(interface, NULL);
	/* lock the device */
	mutex_lock(&dev->lock);
	mutex_unlock(&open_disc_mutex);

	/* prevent device read, write and ioctl */
	dev->present = 0;

	/* if the device is opened, idmouse_release will clean this up */
	if (!dev->open) {
		mutex_unlock(&dev->lock);
		idmouse_delete(dev);
	} else {
		/* unlock */
		mutex_unlock(&dev->lock);
	}

	info("%s disconnected", DRIVER_DESC);
}

static int __init usb_idmouse_init(void)
{
	int result;

	info(DRIVER_DESC " " DRIVER_VERSION);

	/* register this driver with the USB subsystem */
	result = usb_register(&idmouse_driver);
	if (result)
		err("Unable to register device (error %d).", result);

	return result;
}

static void __exit usb_idmouse_exit(void)
{
	/* deregister this driver with the USB subsystem */
	usb_deregister(&idmouse_driver);
}

module_init(usb_idmouse_init);
module_exit(usb_idmouse_exit);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
Commit	Line	Data
4244f724	1	/* Siemens ID Mouse driver v0.6
1da177e4 LT	2
	3	This program is free software; you can redistribute it and/or
	4	modify it under the terms of the GNU General Public License as
	5	published by the Free Software Foundation; either version 2 of
	6	the License, or (at your option) any later version.
	7
	8	Copyright (C) 2004-5 by Florian 'Floe' Echtler <echtler@fs.tum.de>
	9	and Andreas 'ad' Deresch <aderesch@fs.tum.de>
	10
	11	Derived from the USB Skeleton driver 1.1,
	12	Copyright (C) 2003 Greg Kroah-Hartman (greg@kroah.com)
	13
4244f724 FE	14	Additional information provided by Martin Reising
	15	<Martin.Reising@natural-computing.de>
	16
1da177e4 LT	17	*/
1da177e4 LT	18
1da177e4 LT	19	#include <linux/kernel.h>
	20	#include <linux/errno.h>
	21	#include <linux/delay.h>
	22	#include <linux/init.h>
	23	#include <linux/slab.h>
	24	#include <linux/module.h>
1da177e4	25	#include <linux/completion.h>
4186ecf8	26	#include <linux/mutex.h>
1da177e4 LT	27	#include <asm/uaccess.h>
	28	#include <linux/usb.h>
	29
4244f724	30	/* image constants */
1da177e4	31	#define WIDTH 225
4244f724 FE	32	#define HEIGHT 289
4244f724 FE	33	#define HEADER "P5 225 289 255 "
1da177e4 LT	34	#define IMGSIZE ((WIDTH * HEIGHT) + sizeof(HEADER)-1)
1da177e4 LT	35
4244f724 FE	36	/* version information */
4244f724 FE	37	#define DRIVER_VERSION "0.6"
1da177e4 LT	38	#define DRIVER_SHORT "idmouse"
	39	#define DRIVER_AUTHOR "Florian 'Floe' Echtler <echtler@fs.tum.de>"
	40	#define DRIVER_DESC "Siemens ID Mouse FingerTIP Sensor Driver"
	41
4244f724	42	/* minor number for misc USB devices */
1da177e4 LT	43	#define USB_IDMOUSE_MINOR_BASE 132
1da177e4 LT	44
4244f724 FE	45	/* vendor and device IDs */
	46	#define ID_SIEMENS 0x0681
	47	#define ID_IDMOUSE 0x0005
	48	#define ID_CHERRY 0x0010
	49
	50	/* device ID table */
1da177e4	51	static struct usb_device_id idmouse_table[] = {
4244f724 FE	52	{USB_DEVICE(ID_SIEMENS, ID_IDMOUSE)}, /* Siemens ID Mouse (Professional) */
	53	{USB_DEVICE(ID_SIEMENS, ID_CHERRY )}, /* Cherry FingerTIP ID Board */
	54	{} /* terminating null entry */
1da177e4 LT	55	};
1da177e4 LT	56
4244f724 FE	57	/* sensor commands */
	58	#define FTIP_RESET 0x20
	59	#define FTIP_ACQUIRE 0x21
	60	#define FTIP_RELEASE 0x22
	61	#define FTIP_BLINK 0x23 /* LSB of value = blink pulse width */
	62	#define FTIP_SCROLL 0x24
	63
	64	#define ftip_command(dev, command, value, index) \
	65	usb_control_msg (dev->udev, usb_sndctrlpipe (dev->udev, 0), command, \
	66	USB_TYPE_VENDOR \| USB_RECIP_ENDPOINT \| USB_DIR_OUT, value, index, NULL, 0, 1000)
	67
1da177e4	68	MODULE_DEVICE_TABLE(usb, idmouse_table);
54d2bc06	69	static DEFINE_MUTEX(open_disc_mutex);
1da177e4 LT	70
	71	/* structure to hold all of our device specific stuff */
	72	struct usb_idmouse {
	73
	74	struct usb_device udev; / save off the usb device pointer */
	75	struct usb_interface interface; / the interface for this device */
	76
	77	unsigned char bulk_in_buffer; / the buffer to receive data */
4244f724 FE	78	size_t bulk_in_size; /* the maximum bulk packet size */
4244f724 FE	79	size_t orig_bi_size; /* same as above, but reported by the device */
1da177e4 LT	80	__u8 bulk_in_endpointAddr; /* the address of the bulk in endpoint */
	81
	82	int open; /* if the port is open or not */
	83	int present; /* if the device is not disconnected */
54d2bc06	84	struct mutex lock; /* locks this structure */
1da177e4 LT	85
	86	};
	87
	88	/* local function prototypes */
	89	static ssize_t idmouse_read(struct file file, char __user buffer,
	90	size_t count, loff_t * ppos);
	91
	92	static int idmouse_open(struct inode inode, struct file file);
	93	static int idmouse_release(struct inode inode, struct file file);
	94
	95	static int idmouse_probe(struct usb_interface *interface,
	96	const struct usb_device_id *id);
	97
	98	static void idmouse_disconnect(struct usb_interface *interface);
	99
	100	/* file operation pointers */
066202dd	101	static const struct file_operations idmouse_fops = {
1da177e4 LT	102	.owner = THIS_MODULE,
	103	.read = idmouse_read,
	104	.open = idmouse_open,
	105	.release = idmouse_release,
	106	};
	107
d6e5bcf4	108	/* class driver information */
1da177e4	109	static struct usb_class_driver idmouse_class = {
d6e5bcf4	110	.name = "idmouse%d",
1da177e4	111	.fops = &idmouse_fops,
1da177e4 LT	112	.minor_base = USB_IDMOUSE_MINOR_BASE,
	113	};
	114
	115	/* usb specific object needed to register this driver with the usb subsystem */
	116	static struct usb_driver idmouse_driver = {
1da177e4 LT	117	.name = DRIVER_SHORT,
	118	.probe = idmouse_probe,
	119	.disconnect = idmouse_disconnect,
	120	.id_table = idmouse_table,
	121	};
	122
1da177e4 LT	123	static int idmouse_create_image(struct usb_idmouse *dev)
1da177e4 LT	124	{
54ecf1fb MK	125	int bytes_read;
	126	int bulk_read;
	127	int result;
1da177e4	128
4244f724	129	memcpy(dev->bulk_in_buffer, HEADER, sizeof(HEADER)-1);
54ecf1fb	130	bytes_read = sizeof(HEADER)-1;
1da177e4	131
4244f724 FE	132	/* reset the device and set a fast blink rate */
4244f724 FE	133	result = ftip_command(dev, FTIP_RELEASE, 0, 0);
1da177e4	134	if (result < 0)
4244f724 FE	135	goto reset;
4244f724 FE	136	result = ftip_command(dev, FTIP_BLINK, 1, 0);
1da177e4	137	if (result < 0)
4244f724	138	goto reset;
1da177e4	139
4244f724 FE	140	/* initialize the sensor - sending this command twice */
	141	/* significantly reduces the rate of failed reads */
	142	result = ftip_command(dev, FTIP_ACQUIRE, 0, 0);
1da177e4	143	if (result < 0)
4244f724 FE	144	goto reset;
4244f724 FE	145	result = ftip_command(dev, FTIP_ACQUIRE, 0, 0);
1da177e4	146	if (result < 0)
4244f724 FE	147	goto reset;
	148
	149	/* start the readout - sending this command twice */
	150	/* presumably enables the high dynamic range mode */
	151	result = ftip_command(dev, FTIP_RESET, 0, 0);
1da177e4	152	if (result < 0)
4244f724 FE	153	goto reset;
	154	result = ftip_command(dev, FTIP_RESET, 0, 0);
	155	if (result < 0)
	156	goto reset;
1da177e4 LT	157
	158	/* loop over a blocking bulk read to get data from the device */
	159	while (bytes_read < IMGSIZE) {
	160	result = usb_bulk_msg (dev->udev,
	161	usb_rcvbulkpipe (dev->udev, dev->bulk_in_endpointAddr),
	162	dev->bulk_in_buffer + bytes_read,
	163	dev->bulk_in_size, &bulk_read, 5000);
4244f724 FE	164	if (result < 0) {
	165	/* Maybe this error was caused by the increased packet size? */
	166	/* Reset to the original value and tell userspace to retry. */
	167	if (dev->bulk_in_size != dev->orig_bi_size) {
	168	dev->bulk_in_size = dev->orig_bi_size;
	169	result = -EAGAIN;
	170	}
	171	break;
	172	}
	173	if (signal_pending(current)) {
	174	result = -EINTR;
	175	break;
	176	}
1da177e4 LT	177	bytes_read += bulk_read;
	178	}
	179
	180	/* reset the device */
4244f724 FE	181	reset:
	182	ftip_command(dev, FTIP_RELEASE, 0, 0);
	183
	184	/* check for valid image */
	185	/* right border should be black (0x00) */
	186	for (bytes_read = sizeof(HEADER)-1 + WIDTH-1; bytes_read < IMGSIZE; bytes_read += WIDTH)
	187	if (dev->bulk_in_buffer[bytes_read] != 0x00)
	188	return -EAGAIN;
1da177e4	189
4244f724 FE	190	/* lower border should be white (0xFF) */
	191	for (bytes_read = IMGSIZE-WIDTH; bytes_read < IMGSIZE-1; bytes_read++)
	192	if (dev->bulk_in_buffer[bytes_read] != 0xFF)
	193	return -EAGAIN;
	194
	195	/* should be IMGSIZE == 65040 */
1da177e4	196	dbg("read %d bytes fingerprint data", bytes_read);
4244f724	197	return result;
1da177e4 LT	198	}
	199
	200	static inline void idmouse_delete(struct usb_idmouse *dev)
	201	{
	202	kfree(dev->bulk_in_buffer);
	203	kfree(dev);
	204	}
	205
	206	static int idmouse_open(struct inode inode, struct file file)
	207	{
54ecf1fb	208	struct usb_idmouse *dev;
1da177e4	209	struct usb_interface *interface;
54ecf1fb	210	int result;
1da177e4	211
1da177e4 LT	212	/* get the interface from minor number and driver information */
1da177e4 LT	213	interface = usb_find_interface (&idmouse_driver, iminor (inode));
d4ead16f	214	if (!interface)
1da177e4	215	return -ENODEV;
d4ead16f	216
54d2bc06	217	mutex_lock(&open_disc_mutex);
1da177e4 LT	218	/* get the device information block from the interface */
1da177e4 LT	219	dev = usb_get_intfdata(interface);
54d2bc06 ON	220	if (!dev) {
54d2bc06 ON	221	mutex_unlock(&open_disc_mutex);
1da177e4	222	return -ENODEV;
54d2bc06	223	}
1da177e4 LT	224
1da177e4 LT	225	/* lock this device */
54d2bc06 ON	226	mutex_lock(&dev->lock);
54d2bc06 ON	227	mutex_unlock(&open_disc_mutex);
1da177e4 LT	228
	229	/* check if already open */
	230	if (dev->open) {
	231
	232	/* already open, so fail */
	233	result = -EBUSY;
	234
	235	} else {
	236
	237	/* create a new image and check for success */
	238	result = idmouse_create_image (dev);
	239	if (result)
	240	goto error;
	241
	242	/* increment our usage count for the driver */
	243	++dev->open;
	244
	245	/* save our object in the file's private structure */
	246	file->private_data = dev;
	247
	248	}
	249
	250	error:
	251
	252	/* unlock this device */
54d2bc06	253	mutex_unlock(&dev->lock);
1da177e4 LT	254	return result;
	255	}
	256
	257	static int idmouse_release(struct inode inode, struct file file)
	258	{
	259	struct usb_idmouse *dev;
	260
47278107	261	dev = file->private_data;
1da177e4	262
d4ead16f	263	if (dev == NULL)
1da177e4	264	return -ENODEV;
1da177e4	265
54d2bc06	266	mutex_lock(&open_disc_mutex);
1da177e4	267	/* lock our device */
54d2bc06	268	mutex_lock(&dev->lock);
1da177e4 LT	269
	270	/* are we really open? */
	271	if (dev->open <= 0) {
54d2bc06 ON	272	mutex_unlock(&dev->lock);
54d2bc06 ON	273	mutex_unlock(&open_disc_mutex);
1da177e4 LT	274	return -ENODEV;
	275	}
	276
	277	--dev->open;
	278
	279	if (!dev->present) {
	280	/* the device was unplugged before the file was released */
54d2bc06 ON	281	mutex_unlock(&dev->lock);
54d2bc06 ON	282	mutex_unlock(&open_disc_mutex);
1da177e4	283	idmouse_delete(dev);
d4ead16f	284	} else {
54d2bc06 ON	285	mutex_unlock(&dev->lock);
54d2bc06 ON	286	mutex_unlock(&open_disc_mutex);
1da177e4	287	}
1da177e4 LT	288	return 0;
	289	}
	290
	291	static ssize_t idmouse_read(struct file file, char __user buffer, size_t count,
	292	loff_t * ppos)
	293	{
47278107	294	struct usb_idmouse *dev = file->private_data;
54ecf1fb	295	int result;
1da177e4	296
4244f724	297	/* lock this object */
54d2bc06	298	mutex_lock(&dev->lock);
1da177e4	299
4244f724	300	/* verify that the device wasn't unplugged */
1da177e4	301	if (!dev->present) {
54d2bc06	302	mutex_unlock(&dev->lock);
1da177e4 LT	303	return -ENODEV;
	304	}
	305
018a2cdf AV	306	result = simple_read_from_buffer(buffer, count, ppos,
018a2cdf AV	307	dev->bulk_in_buffer, IMGSIZE);
4244f724	308	/* unlock the device */
54d2bc06	309	mutex_unlock(&dev->lock);
1da177e4 LT	310	return result;
	311	}
	312
	313	static int idmouse_probe(struct usb_interface *interface,
	314	const struct usb_device_id *id)
	315	{
	316	struct usb_device *udev = interface_to_usbdev(interface);
54ecf1fb	317	struct usb_idmouse *dev;
1da177e4 LT	318	struct usb_host_interface *iface_desc;
1da177e4 LT	319	struct usb_endpoint_descriptor *endpoint;
1da177e4 LT	320	int result;
	321
	322	/* check if we have gotten the data or the hid interface */
	323	iface_desc = &interface->altsetting[0];
	324	if (iface_desc->desc.bInterfaceClass != 0x0A)
	325	return -ENODEV;
	326
	327	/* allocate memory for our device state and initialize it */
092e462a	328	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1da177e4 LT	329	if (dev == NULL)
1da177e4 LT	330	return -ENOMEM;
1da177e4	331
54d2bc06	332	mutex_init(&dev->lock);
1da177e4 LT	333	dev->udev = udev;
	334	dev->interface = interface;
	335
	336	/* set up the endpoint information - use only the first bulk-in endpoint */
	337	endpoint = &iface_desc->endpoint[0].desc;
a7dc218b	338	if (!dev->bulk_in_endpointAddr && usb_endpoint_is_bulk_in(endpoint)) {
1da177e4	339	/* we found a bulk in endpoint */
4244f724 FE	340	dev->orig_bi_size = le16_to_cpu(endpoint->wMaxPacketSize);
4244f724 FE	341	dev->bulk_in_size = 0x200; /* works _much_ faster */
1da177e4 LT	342	dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
1da177e4 LT	343	dev->bulk_in_buffer =
4244f724	344	kmalloc(IMGSIZE + dev->bulk_in_size, GFP_KERNEL);
1da177e4 LT	345
	346	if (!dev->bulk_in_buffer) {
	347	err("Unable to allocate input buffer.");
	348	idmouse_delete(dev);
	349	return -ENOMEM;
	350	}
	351	}
	352
	353	if (!(dev->bulk_in_endpointAddr)) {
	354	err("Unable to find bulk-in endpoint.");
	355	idmouse_delete(dev);
	356	return -ENODEV;
	357	}
	358	/* allow device read, write and ioctl */
	359	dev->present = 1;
	360
	361	/* we can register the device now, as it is ready */
	362	usb_set_intfdata(interface, dev);
	363	result = usb_register_dev(interface, &idmouse_class);
	364	if (result) {
	365	/* something prevented us from registering this device */
	366	err("Unble to allocate minor number.");
	367	usb_set_intfdata(interface, NULL);
	368	idmouse_delete(dev);
	369	return result;
	370	}
	371
	372	/* be noisy */
	373	dev_info(&interface->dev,"%s now attached\n",DRIVER_DESC);
	374
	375	return 0;
	376	}
	377
	378	static void idmouse_disconnect(struct usb_interface *interface)
	379	{
	380	struct usb_idmouse *dev;
	381
1da177e4 LT	382	/* get device structure */
1da177e4 LT	383	dev = usb_get_intfdata(interface);
1da177e4	384
1da177e4 LT	385	/* give back our minor */
	386	usb_deregister_dev(interface, &idmouse_class);
	387
54d2bc06 ON	388	mutex_lock(&open_disc_mutex);
	389	usb_set_intfdata(interface, NULL);
	390	/* lock the device */
	391	mutex_lock(&dev->lock);
	392	mutex_unlock(&open_disc_mutex);
d4ead16f	393
1da177e4 LT	394	/* prevent device read, write and ioctl */
	395	dev->present = 0;
	396
1da177e4	397	/* if the device is opened, idmouse_release will clean this up */
d4ead16f	398	if (!dev->open) {
54d2bc06	399	mutex_unlock(&dev->lock);
1da177e4	400	idmouse_delete(dev);
d4ead16f AS	401	} else {
d4ead16f AS	402	/* unlock */
54d2bc06	403	mutex_unlock(&dev->lock);
d4ead16f	404	}
1da177e4 LT	405
	406	info("%s disconnected", DRIVER_DESC);
	407	}
	408
	409	static int __init usb_idmouse_init(void)
	410	{
	411	int result;
	412
	413	info(DRIVER_DESC " " DRIVER_VERSION);
	414
	415	/* register this driver with the USB subsystem */
	416	result = usb_register(&idmouse_driver);
	417	if (result)
	418	err("Unable to register device (error %d).", result);
	419
	420	return result;
	421	}
	422
	423	static void __exit usb_idmouse_exit(void)
	424	{
	425	/* deregister this driver with the USB subsystem */
	426	usb_deregister(&idmouse_driver);
	427	}
	428
	429	module_init(usb_idmouse_init);
	430	module_exit(usb_idmouse_exit);
	431
	432	MODULE_AUTHOR(DRIVER_AUTHOR);
	433	MODULE_DESCRIPTION(DRIVER_DESC);
	434	MODULE_LICENSE("GPL");
	435