[GitHub/mt8127/android_kernel_alcatel_ttab.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/smp_lock.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);

/* 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 semaphore sem; /* 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,
};

/* prevent races between open() and disconnect() */
static DEFINE_MUTEX(disconnect_mutex);

static int idmouse_create_image(struct usb_idmouse *dev)
{
	int bytes_read = 0;
	int bulk_read = 0;
	int result = 0;

	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 = NULL;
	struct usb_interface *interface;
	int result = 0;

	/* prevent disconnects */
	mutex_lock(&disconnect_mutex);

	/* get the interface from minor number and driver information */
	interface = usb_find_interface (&idmouse_driver, iminor (inode));
	if (!interface) {
		mutex_unlock(&disconnect_mutex);
		return -ENODEV;
	}
	/* get the device information block from the interface */
	dev = usb_get_intfdata(interface);
	if (!dev) {
		mutex_unlock(&disconnect_mutex);
		return -ENODEV;
	}

	/* lock this device */
	down(&dev->sem);

	/* 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 */
	up(&dev->sem);

	/* unlock the disconnect semaphore */
	mutex_unlock(&disconnect_mutex);
	return result;
}

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

	/* prevent a race condition with open() */
	mutex_lock(&disconnect_mutex);

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

	if (dev == NULL) {
		mutex_unlock(&disconnect_mutex);
		return -ENODEV;
	}

	/* lock our device */
	down(&dev->sem);

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

	--dev->open;

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

	up(&dev->sem);
	mutex_unlock(&disconnect_mutex);
	return 0;
}

static ssize_t idmouse_read(struct file *file, char __user *buffer, size_t count,
				loff_t * ppos)
{
	struct usb_idmouse *dev;
	int result = 0;

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

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

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

	result = simple_read_from_buffer(buffer, count, ppos,
					dev->bulk_in_buffer, IMGSIZE);
	/* unlock the device */
	up(&dev->sem);
	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 = NULL;
	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;

	init_MUTEX(&dev->sem);
	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;

	/* prevent races with open() */
	mutex_lock(&disconnect_mutex);

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

	/* lock it */
	down(&dev->sem);

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

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

	/* unlock */
	up(&dev->sem);

	/* if the device is opened, idmouse_release will clean this up */
	if (!dev->open)
		idmouse_delete(dev);

	mutex_unlock(&disconnect_mutex);

	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>
	25	#include <linux/smp_lock.h>
	26	#include <linux/completion.h>
4186ecf8	27	#include <linux/mutex.h>
1da177e4 LT	28	#include <asm/uaccess.h>
	29	#include <linux/usb.h>
	30
4244f724	31	/* image constants */
1da177e4	32	#define WIDTH 225
4244f724 FE	33	#define HEIGHT 289
4244f724 FE	34	#define HEADER "P5 225 289 255 "
1da177e4 LT	35	#define IMGSIZE ((WIDTH * HEIGHT) + sizeof(HEADER)-1)
1da177e4 LT	36
4244f724 FE	37	/* version information */
4244f724 FE	38	#define DRIVER_VERSION "0.6"
1da177e4 LT	39	#define DRIVER_SHORT "idmouse"
	40	#define DRIVER_AUTHOR "Florian 'Floe' Echtler <echtler@fs.tum.de>"
	41	#define DRIVER_DESC "Siemens ID Mouse FingerTIP Sensor Driver"
	42
4244f724	43	/* minor number for misc USB devices */
1da177e4 LT	44	#define USB_IDMOUSE_MINOR_BASE 132
1da177e4 LT	45
4244f724 FE	46	/* vendor and device IDs */
	47	#define ID_SIEMENS 0x0681
	48	#define ID_IDMOUSE 0x0005
	49	#define ID_CHERRY 0x0010
	50
	51	/* device ID table */
1da177e4	52	static struct usb_device_id idmouse_table[] = {
4244f724 FE	53	{USB_DEVICE(ID_SIEMENS, ID_IDMOUSE)}, /* Siemens ID Mouse (Professional) */
	54	{USB_DEVICE(ID_SIEMENS, ID_CHERRY )}, /* Cherry FingerTIP ID Board */
	55	{} /* terminating null entry */
1da177e4 LT	56	};
1da177e4 LT	57
4244f724 FE	58	/* sensor commands */
	59	#define FTIP_RESET 0x20
	60	#define FTIP_ACQUIRE 0x21
	61	#define FTIP_RELEASE 0x22
	62	#define FTIP_BLINK 0x23 /* LSB of value = blink pulse width */
	63	#define FTIP_SCROLL 0x24
	64
	65	#define ftip_command(dev, command, value, index) \
	66	usb_control_msg (dev->udev, usb_sndctrlpipe (dev->udev, 0), command, \
	67	USB_TYPE_VENDOR \| USB_RECIP_ENDPOINT \| USB_DIR_OUT, value, index, NULL, 0, 1000)
	68
1da177e4 LT	69	MODULE_DEVICE_TABLE(usb, idmouse_table);
	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 */
	84	struct semaphore sem; /* locks this structure */
	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
4244f724	123	/* prevent races between open() and disconnect() */
4186ecf8	124	static DEFINE_MUTEX(disconnect_mutex);
1da177e4 LT	125
	126	static int idmouse_create_image(struct usb_idmouse *dev)
	127	{
	128	int bytes_read = 0;
	129	int bulk_read = 0;
	130	int result = 0;
	131
4244f724	132	memcpy(dev->bulk_in_buffer, HEADER, sizeof(HEADER)-1);
1da177e4 LT	133	bytes_read += sizeof(HEADER)-1;
1da177e4 LT	134
4244f724 FE	135	/* reset the device and set a fast blink rate */
4244f724 FE	136	result = ftip_command(dev, FTIP_RELEASE, 0, 0);
1da177e4	137	if (result < 0)
4244f724 FE	138	goto reset;
4244f724 FE	139	result = ftip_command(dev, FTIP_BLINK, 1, 0);
1da177e4	140	if (result < 0)
4244f724	141	goto reset;
1da177e4	142
4244f724 FE	143	/* initialize the sensor - sending this command twice */
	144	/* significantly reduces the rate of failed reads */
	145	result = ftip_command(dev, FTIP_ACQUIRE, 0, 0);
1da177e4	146	if (result < 0)
4244f724 FE	147	goto reset;
4244f724 FE	148	result = ftip_command(dev, FTIP_ACQUIRE, 0, 0);
1da177e4	149	if (result < 0)
4244f724 FE	150	goto reset;
	151
	152	/* start the readout - sending this command twice */
	153	/* presumably enables the high dynamic range mode */
	154	result = ftip_command(dev, FTIP_RESET, 0, 0);
1da177e4	155	if (result < 0)
4244f724 FE	156	goto reset;
	157	result = ftip_command(dev, FTIP_RESET, 0, 0);
	158	if (result < 0)
	159	goto reset;
1da177e4 LT	160
	161	/* loop over a blocking bulk read to get data from the device */
	162	while (bytes_read < IMGSIZE) {
	163	result = usb_bulk_msg (dev->udev,
	164	usb_rcvbulkpipe (dev->udev, dev->bulk_in_endpointAddr),
	165	dev->bulk_in_buffer + bytes_read,
	166	dev->bulk_in_size, &bulk_read, 5000);
4244f724 FE	167	if (result < 0) {
	168	/* Maybe this error was caused by the increased packet size? */
	169	/* Reset to the original value and tell userspace to retry. */
	170	if (dev->bulk_in_size != dev->orig_bi_size) {
	171	dev->bulk_in_size = dev->orig_bi_size;
	172	result = -EAGAIN;
	173	}
	174	break;
	175	}
	176	if (signal_pending(current)) {
	177	result = -EINTR;
	178	break;
	179	}
1da177e4 LT	180	bytes_read += bulk_read;
	181	}
	182
	183	/* reset the device */
4244f724 FE	184	reset:
	185	ftip_command(dev, FTIP_RELEASE, 0, 0);
	186
	187	/* check for valid image */
	188	/* right border should be black (0x00) */
	189	for (bytes_read = sizeof(HEADER)-1 + WIDTH-1; bytes_read < IMGSIZE; bytes_read += WIDTH)
	190	if (dev->bulk_in_buffer[bytes_read] != 0x00)
	191	return -EAGAIN;
1da177e4	192
4244f724 FE	193	/* lower border should be white (0xFF) */
	194	for (bytes_read = IMGSIZE-WIDTH; bytes_read < IMGSIZE-1; bytes_read++)
	195	if (dev->bulk_in_buffer[bytes_read] != 0xFF)
	196	return -EAGAIN;
	197
	198	/* should be IMGSIZE == 65040 */
1da177e4	199	dbg("read %d bytes fingerprint data", bytes_read);
4244f724	200	return result;
1da177e4 LT	201	}
	202
	203	static inline void idmouse_delete(struct usb_idmouse *dev)
	204	{
	205	kfree(dev->bulk_in_buffer);
	206	kfree(dev);
	207	}
	208
	209	static int idmouse_open(struct inode inode, struct file file)
	210	{
	211	struct usb_idmouse *dev = NULL;
	212	struct usb_interface *interface;
	213	int result = 0;
	214
	215	/* prevent disconnects */
4186ecf8	216	mutex_lock(&disconnect_mutex);
1da177e4 LT	217
	218	/* get the interface from minor number and driver information */
	219	interface = usb_find_interface (&idmouse_driver, iminor (inode));
	220	if (!interface) {
4186ecf8	221	mutex_unlock(&disconnect_mutex);
1da177e4 LT	222	return -ENODEV;
	223	}
	224	/* get the device information block from the interface */
	225	dev = usb_get_intfdata(interface);
	226	if (!dev) {
4186ecf8	227	mutex_unlock(&disconnect_mutex);
1da177e4 LT	228	return -ENODEV;
	229	}
	230
	231	/* lock this device */
	232	down(&dev->sem);
	233
	234	/* check if already open */
	235	if (dev->open) {
	236
	237	/* already open, so fail */
	238	result = -EBUSY;
	239
	240	} else {
	241
	242	/* create a new image and check for success */
	243	result = idmouse_create_image (dev);
	244	if (result)
	245	goto error;
	246
	247	/* increment our usage count for the driver */
	248	++dev->open;
	249
	250	/* save our object in the file's private structure */
	251	file->private_data = dev;
	252
	253	}
	254
	255	error:
	256
	257	/* unlock this device */
	258	up(&dev->sem);
	259
	260	/* unlock the disconnect semaphore */
4186ecf8	261	mutex_unlock(&disconnect_mutex);
1da177e4 LT	262	return result;
	263	}
	264
	265	static int idmouse_release(struct inode inode, struct file file)
	266	{
	267	struct usb_idmouse *dev;
	268
	269	/* prevent a race condition with open() */
4186ecf8	270	mutex_lock(&disconnect_mutex);
1da177e4 LT	271
	272	dev = (struct usb_idmouse *) file->private_data;
	273
	274	if (dev == NULL) {
4186ecf8	275	mutex_unlock(&disconnect_mutex);
1da177e4 LT	276	return -ENODEV;
	277	}
	278
	279	/* lock our device */
	280	down(&dev->sem);
	281
	282	/* are we really open? */
	283	if (dev->open <= 0) {
	284	up(&dev->sem);
4186ecf8	285	mutex_unlock(&disconnect_mutex);
1da177e4 LT	286	return -ENODEV;
	287	}
	288
	289	--dev->open;
	290
	291	if (!dev->present) {
	292	/* the device was unplugged before the file was released */
	293	up(&dev->sem);
	294	idmouse_delete(dev);
4186ecf8	295	mutex_unlock(&disconnect_mutex);
1da177e4 LT	296	return 0;
	297	}
	298
	299	up(&dev->sem);
4186ecf8	300	mutex_unlock(&disconnect_mutex);
1da177e4 LT	301	return 0;
	302	}
	303
	304	static ssize_t idmouse_read(struct file file, char __user buffer, size_t count,
	305	loff_t * ppos)
	306	{
	307	struct usb_idmouse *dev;
	308	int result = 0;
	309
	310	dev = (struct usb_idmouse *) file->private_data;
	311
4244f724	312	/* lock this object */
1da177e4 LT	313	down (&dev->sem);
1da177e4 LT	314
4244f724	315	/* verify that the device wasn't unplugged */
1da177e4 LT	316	if (!dev->present) {
	317	up (&dev->sem);
	318	return -ENODEV;
	319	}
	320
018a2cdf AV	321	result = simple_read_from_buffer(buffer, count, ppos,
018a2cdf AV	322	dev->bulk_in_buffer, IMGSIZE);
4244f724	323	/* unlock the device */
1da177e4 LT	324	up(&dev->sem);
	325	return result;
	326	}
	327
	328	static int idmouse_probe(struct usb_interface *interface,
	329	const struct usb_device_id *id)
	330	{
	331	struct usb_device *udev = interface_to_usbdev(interface);
	332	struct usb_idmouse *dev = NULL;
	333	struct usb_host_interface *iface_desc;
	334	struct usb_endpoint_descriptor *endpoint;
1da177e4 LT	335	int result;
	336
	337	/* check if we have gotten the data or the hid interface */
	338	iface_desc = &interface->altsetting[0];
	339	if (iface_desc->desc.bInterfaceClass != 0x0A)
	340	return -ENODEV;
	341
	342	/* allocate memory for our device state and initialize it */
092e462a	343	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1da177e4 LT	344	if (dev == NULL)
1da177e4 LT	345	return -ENOMEM;
1da177e4 LT	346
	347	init_MUTEX(&dev->sem);
	348	dev->udev = udev;
	349	dev->interface = interface;
	350
	351	/* set up the endpoint information - use only the first bulk-in endpoint */
	352	endpoint = &iface_desc->endpoint[0].desc;
a7dc218b	353	if (!dev->bulk_in_endpointAddr && usb_endpoint_is_bulk_in(endpoint)) {
1da177e4	354	/* we found a bulk in endpoint */
4244f724 FE	355	dev->orig_bi_size = le16_to_cpu(endpoint->wMaxPacketSize);
4244f724 FE	356	dev->bulk_in_size = 0x200; /* works _much_ faster */
1da177e4 LT	357	dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
1da177e4 LT	358	dev->bulk_in_buffer =
4244f724	359	kmalloc(IMGSIZE + dev->bulk_in_size, GFP_KERNEL);
1da177e4 LT	360
	361	if (!dev->bulk_in_buffer) {
	362	err("Unable to allocate input buffer.");
	363	idmouse_delete(dev);
	364	return -ENOMEM;
	365	}
	366	}
	367
	368	if (!(dev->bulk_in_endpointAddr)) {
	369	err("Unable to find bulk-in endpoint.");
	370	idmouse_delete(dev);
	371	return -ENODEV;
	372	}
	373	/* allow device read, write and ioctl */
	374	dev->present = 1;
	375
	376	/* we can register the device now, as it is ready */
	377	usb_set_intfdata(interface, dev);
	378	result = usb_register_dev(interface, &idmouse_class);
	379	if (result) {
	380	/* something prevented us from registering this device */
	381	err("Unble to allocate minor number.");
	382	usb_set_intfdata(interface, NULL);
	383	idmouse_delete(dev);
	384	return result;
	385	}
	386
	387	/* be noisy */
	388	dev_info(&interface->dev,"%s now attached\n",DRIVER_DESC);
	389
	390	return 0;
	391	}
	392
	393	static void idmouse_disconnect(struct usb_interface *interface)
	394	{
	395	struct usb_idmouse *dev;
	396
	397	/* prevent races with open() */
4186ecf8	398	mutex_lock(&disconnect_mutex);
1da177e4 LT	399
	400	/* get device structure */
	401	dev = usb_get_intfdata(interface);
	402	usb_set_intfdata(interface, NULL);
	403
	404	/* lock it */
	405	down(&dev->sem);
	406
	407	/* give back our minor */
	408	usb_deregister_dev(interface, &idmouse_class);
	409
	410	/* prevent device read, write and ioctl */
	411	dev->present = 0;
	412
	413	/* unlock */
	414	up(&dev->sem);
	415
	416	/* if the device is opened, idmouse_release will clean this up */
	417	if (!dev->open)
	418	idmouse_delete(dev);
	419
4186ecf8	420	mutex_unlock(&disconnect_mutex);
1da177e4 LT	421
	422	info("%s disconnected", DRIVER_DESC);
	423	}
	424
	425	static int __init usb_idmouse_init(void)
	426	{
	427	int result;
	428
	429	info(DRIVER_DESC " " DRIVER_VERSION);
	430
	431	/* register this driver with the USB subsystem */
	432	result = usb_register(&idmouse_driver);
	433	if (result)
	434	err("Unable to register device (error %d).", result);
	435
	436	return result;
	437	}
	438
	439	static void __exit usb_idmouse_exit(void)
	440	{
	441	/* deregister this driver with the USB subsystem */
	442	usb_deregister(&idmouse_driver);
	443	}
	444
	445	module_init(usb_idmouse_init);
	446	module_exit(usb_idmouse_exit);
	447
	448	MODULE_AUTHOR(DRIVER_AUTHOR);
	449	MODULE_DESCRIPTION(DRIVER_DESC);
	450	MODULE_LICENSE("GPL");
	451