[linux-2.6-block.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 const 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);
static int idmouse_suspend(struct usb_interface *intf, pm_message_t message);
static int idmouse_resume(struct usb_interface *intf);

/* 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,
	.suspend = idmouse_suspend,
	.resume = idmouse_resume,
	.reset_resume = idmouse_resume,
	.id_table = idmouse_table,
	.supports_autosuspend = 1,
};

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;
}

/* PM operations are nops as this driver does IO only during open() */
static int idmouse_suspend(struct usb_interface *intf, pm_message_t message)
{
	return 0;
}

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

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 = usb_autopm_get_interface(interface);
		if (result)
			goto error;
		result = idmouse_create_image (dev);
		if (result)
			goto error;
		usb_autopm_put_interface(interface);

		/* 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);
	}

	dev_info(&interface->dev, "disconnected\n");
}

static int __init usb_idmouse_init(void)
{
	int result;

	printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
	       DRIVER_DESC "\n");

	/* 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 */
33b9e162	51	static const 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);
d9bfbd16 ON	99	static int idmouse_suspend(struct usb_interface *intf, pm_message_t message);
d9bfbd16 ON	100	static int idmouse_resume(struct usb_interface *intf);
1da177e4 LT	101
1da177e4 LT	102	/* file operation pointers */
066202dd	103	static const struct file_operations idmouse_fops = {
1da177e4 LT	104	.owner = THIS_MODULE,
	105	.read = idmouse_read,
	106	.open = idmouse_open,
	107	.release = idmouse_release,
	108	};
	109
d6e5bcf4	110	/* class driver information */
1da177e4	111	static struct usb_class_driver idmouse_class = {
d6e5bcf4	112	.name = "idmouse%d",
1da177e4	113	.fops = &idmouse_fops,
1da177e4 LT	114	.minor_base = USB_IDMOUSE_MINOR_BASE,
	115	};
	116
	117	/* usb specific object needed to register this driver with the usb subsystem */
	118	static struct usb_driver idmouse_driver = {
1da177e4 LT	119	.name = DRIVER_SHORT,
	120	.probe = idmouse_probe,
	121	.disconnect = idmouse_disconnect,
d9bfbd16 ON	122	.suspend = idmouse_suspend,
	123	.resume = idmouse_resume,
	124	.reset_resume = idmouse_resume,
1da177e4	125	.id_table = idmouse_table,
d9bfbd16	126	.supports_autosuspend = 1,
1da177e4 LT	127	};
1da177e4 LT	128
1da177e4 LT	129	static int idmouse_create_image(struct usb_idmouse *dev)
1da177e4 LT	130	{
54ecf1fb MK	131	int bytes_read;
	132	int bulk_read;
	133	int result;
1da177e4	134
4244f724	135	memcpy(dev->bulk_in_buffer, HEADER, sizeof(HEADER)-1);
54ecf1fb	136	bytes_read = sizeof(HEADER)-1;
1da177e4	137
4244f724 FE	138	/* reset the device and set a fast blink rate */
4244f724 FE	139	result = ftip_command(dev, FTIP_RELEASE, 0, 0);
1da177e4	140	if (result < 0)
4244f724 FE	141	goto reset;
4244f724 FE	142	result = ftip_command(dev, FTIP_BLINK, 1, 0);
1da177e4	143	if (result < 0)
4244f724	144	goto reset;
1da177e4	145
4244f724 FE	146	/* initialize the sensor - sending this command twice */
	147	/* significantly reduces the rate of failed reads */
	148	result = ftip_command(dev, FTIP_ACQUIRE, 0, 0);
1da177e4	149	if (result < 0)
4244f724 FE	150	goto reset;
4244f724 FE	151	result = ftip_command(dev, FTIP_ACQUIRE, 0, 0);
1da177e4	152	if (result < 0)
4244f724 FE	153	goto reset;
	154
	155	/* start the readout - sending this command twice */
	156	/* presumably enables the high dynamic range mode */
	157	result = ftip_command(dev, FTIP_RESET, 0, 0);
1da177e4	158	if (result < 0)
4244f724 FE	159	goto reset;
	160	result = ftip_command(dev, FTIP_RESET, 0, 0);
	161	if (result < 0)
	162	goto reset;
1da177e4 LT	163
	164	/* loop over a blocking bulk read to get data from the device */
	165	while (bytes_read < IMGSIZE) {
	166	result = usb_bulk_msg (dev->udev,
	167	usb_rcvbulkpipe (dev->udev, dev->bulk_in_endpointAddr),
	168	dev->bulk_in_buffer + bytes_read,
	169	dev->bulk_in_size, &bulk_read, 5000);
4244f724 FE	170	if (result < 0) {
	171	/* Maybe this error was caused by the increased packet size? */
	172	/* Reset to the original value and tell userspace to retry. */
	173	if (dev->bulk_in_size != dev->orig_bi_size) {
	174	dev->bulk_in_size = dev->orig_bi_size;
	175	result = -EAGAIN;
	176	}
	177	break;
	178	}
	179	if (signal_pending(current)) {
	180	result = -EINTR;
	181	break;
	182	}
1da177e4 LT	183	bytes_read += bulk_read;
	184	}
	185
	186	/* reset the device */
4244f724 FE	187	reset:
	188	ftip_command(dev, FTIP_RELEASE, 0, 0);
	189
	190	/* check for valid image */
	191	/* right border should be black (0x00) */
	192	for (bytes_read = sizeof(HEADER)-1 + WIDTH-1; bytes_read < IMGSIZE; bytes_read += WIDTH)
	193	if (dev->bulk_in_buffer[bytes_read] != 0x00)
	194	return -EAGAIN;
1da177e4	195
4244f724 FE	196	/* lower border should be white (0xFF) */
	197	for (bytes_read = IMGSIZE-WIDTH; bytes_read < IMGSIZE-1; bytes_read++)
	198	if (dev->bulk_in_buffer[bytes_read] != 0xFF)
	199	return -EAGAIN;
	200
	201	/* should be IMGSIZE == 65040 */
1da177e4	202	dbg("read %d bytes fingerprint data", bytes_read);
4244f724	203	return result;
1da177e4 LT	204	}
1da177e4 LT	205
d9bfbd16 ON	206	/* PM operations are nops as this driver does IO only during open() */
	207	static int idmouse_suspend(struct usb_interface *intf, pm_message_t message)
	208	{
	209	return 0;
	210	}
	211
	212	static int idmouse_resume(struct usb_interface *intf)
	213	{
	214	return 0;
	215	}
	216
1da177e4 LT	217	static inline void idmouse_delete(struct usb_idmouse *dev)
	218	{
	219	kfree(dev->bulk_in_buffer);
	220	kfree(dev);
	221	}
	222
	223	static int idmouse_open(struct inode inode, struct file file)
	224	{
54ecf1fb	225	struct usb_idmouse *dev;
1da177e4	226	struct usb_interface *interface;
54ecf1fb	227	int result;
1da177e4	228
1da177e4 LT	229	/* get the interface from minor number and driver information */
1da177e4 LT	230	interface = usb_find_interface (&idmouse_driver, iminor (inode));
dbdae3bd	231	if (!interface)
1da177e4	232	return -ENODEV;
d4ead16f	233
54d2bc06	234	mutex_lock(&open_disc_mutex);
1da177e4 LT	235	/* get the device information block from the interface */
1da177e4 LT	236	dev = usb_get_intfdata(interface);
54d2bc06 ON	237	if (!dev) {
54d2bc06 ON	238	mutex_unlock(&open_disc_mutex);
1da177e4	239	return -ENODEV;
54d2bc06	240	}
1da177e4 LT	241
1da177e4 LT	242	/* lock this device */
54d2bc06 ON	243	mutex_lock(&dev->lock);
54d2bc06 ON	244	mutex_unlock(&open_disc_mutex);
1da177e4 LT	245
	246	/* check if already open */
	247	if (dev->open) {
	248
	249	/* already open, so fail */
	250	result = -EBUSY;
	251
	252	} else {
	253
	254	/* create a new image and check for success */
d9bfbd16 ON	255	result = usb_autopm_get_interface(interface);
	256	if (result)
	257	goto error;
1da177e4 LT	258	result = idmouse_create_image (dev);
	259	if (result)
	260	goto error;
d9bfbd16	261	usb_autopm_put_interface(interface);
1da177e4 LT	262
	263	/* increment our usage count for the driver */
	264	++dev->open;
	265
	266	/* save our object in the file's private structure */
	267	file->private_data = dev;
	268
	269	}
	270
	271	error:
	272
	273	/* unlock this device */
54d2bc06	274	mutex_unlock(&dev->lock);
1da177e4 LT	275	return result;
	276	}
	277
	278	static int idmouse_release(struct inode inode, struct file file)
	279	{
	280	struct usb_idmouse *dev;
	281
47278107	282	dev = file->private_data;
1da177e4	283
d4ead16f	284	if (dev == NULL)
1da177e4	285	return -ENODEV;
1da177e4	286
54d2bc06	287	mutex_lock(&open_disc_mutex);
1da177e4	288	/* lock our device */
54d2bc06	289	mutex_lock(&dev->lock);
1da177e4 LT	290
	291	/* are we really open? */
	292	if (dev->open <= 0) {
54d2bc06 ON	293	mutex_unlock(&dev->lock);
54d2bc06 ON	294	mutex_unlock(&open_disc_mutex);
1da177e4 LT	295	return -ENODEV;
	296	}
	297
	298	--dev->open;
	299
	300	if (!dev->present) {
	301	/* the device was unplugged before the file was released */
54d2bc06 ON	302	mutex_unlock(&dev->lock);
54d2bc06 ON	303	mutex_unlock(&open_disc_mutex);
1da177e4	304	idmouse_delete(dev);
d4ead16f	305	} else {
54d2bc06 ON	306	mutex_unlock(&dev->lock);
54d2bc06 ON	307	mutex_unlock(&open_disc_mutex);
1da177e4	308	}
1da177e4 LT	309	return 0;
	310	}
	311
	312	static ssize_t idmouse_read(struct file file, char __user buffer, size_t count,
	313	loff_t * ppos)
	314	{
47278107	315	struct usb_idmouse *dev = file->private_data;
54ecf1fb	316	int result;
1da177e4	317
4244f724	318	/* lock this object */
54d2bc06	319	mutex_lock(&dev->lock);
1da177e4	320
4244f724	321	/* verify that the device wasn't unplugged */
1da177e4	322	if (!dev->present) {
54d2bc06	323	mutex_unlock(&dev->lock);
1da177e4 LT	324	return -ENODEV;
	325	}
	326
018a2cdf AV	327	result = simple_read_from_buffer(buffer, count, ppos,
018a2cdf AV	328	dev->bulk_in_buffer, IMGSIZE);
4244f724	329	/* unlock the device */
54d2bc06	330	mutex_unlock(&dev->lock);
1da177e4 LT	331	return result;
	332	}
	333
	334	static int idmouse_probe(struct usb_interface *interface,
	335	const struct usb_device_id *id)
	336	{
	337	struct usb_device *udev = interface_to_usbdev(interface);
54ecf1fb	338	struct usb_idmouse *dev;
1da177e4 LT	339	struct usb_host_interface *iface_desc;
1da177e4 LT	340	struct usb_endpoint_descriptor *endpoint;
1da177e4 LT	341	int result;
	342
	343	/* check if we have gotten the data or the hid interface */
	344	iface_desc = &interface->altsetting[0];
	345	if (iface_desc->desc.bInterfaceClass != 0x0A)
	346	return -ENODEV;
	347
	348	/* allocate memory for our device state and initialize it */
092e462a	349	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1da177e4 LT	350	if (dev == NULL)
1da177e4 LT	351	return -ENOMEM;
1da177e4	352
54d2bc06	353	mutex_init(&dev->lock);
1da177e4 LT	354	dev->udev = udev;
	355	dev->interface = interface;
	356
	357	/* set up the endpoint information - use only the first bulk-in endpoint */
	358	endpoint = &iface_desc->endpoint[0].desc;
a7dc218b	359	if (!dev->bulk_in_endpointAddr && usb_endpoint_is_bulk_in(endpoint)) {
1da177e4	360	/* we found a bulk in endpoint */
4244f724 FE	361	dev->orig_bi_size = le16_to_cpu(endpoint->wMaxPacketSize);
4244f724 FE	362	dev->bulk_in_size = 0x200; /* works _much_ faster */
1da177e4 LT	363	dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
1da177e4 LT	364	dev->bulk_in_buffer =
4244f724	365	kmalloc(IMGSIZE + dev->bulk_in_size, GFP_KERNEL);
1da177e4 LT	366
	367	if (!dev->bulk_in_buffer) {
	368	err("Unable to allocate input buffer.");
	369	idmouse_delete(dev);
	370	return -ENOMEM;
	371	}
	372	}
	373
	374	if (!(dev->bulk_in_endpointAddr)) {
	375	err("Unable to find bulk-in endpoint.");
	376	idmouse_delete(dev);
	377	return -ENODEV;
	378	}
	379	/* allow device read, write and ioctl */
	380	dev->present = 1;
	381
	382	/* we can register the device now, as it is ready */
	383	usb_set_intfdata(interface, dev);
	384	result = usb_register_dev(interface, &idmouse_class);
	385	if (result) {
	386	/* something prevented us from registering this device */
	387	err("Unble to allocate minor number.");
	388	usb_set_intfdata(interface, NULL);
	389	idmouse_delete(dev);
	390	return result;
	391	}
	392
	393	/* be noisy */
	394	dev_info(&interface->dev,"%s now attached\n",DRIVER_DESC);
	395
	396	return 0;
	397	}
	398
	399	static void idmouse_disconnect(struct usb_interface *interface)
	400	{
	401	struct usb_idmouse *dev;
	402
1da177e4 LT	403	/* get device structure */
1da177e4 LT	404	dev = usb_get_intfdata(interface);
1da177e4	405
1da177e4 LT	406	/* give back our minor */
	407	usb_deregister_dev(interface, &idmouse_class);
	408
54d2bc06 ON	409	mutex_lock(&open_disc_mutex);
	410	usb_set_intfdata(interface, NULL);
	411	/* lock the device */
	412	mutex_lock(&dev->lock);
	413	mutex_unlock(&open_disc_mutex);
d4ead16f	414
1da177e4 LT	415	/* prevent device read, write and ioctl */
	416	dev->present = 0;
	417
1da177e4	418	/* if the device is opened, idmouse_release will clean this up */
d4ead16f	419	if (!dev->open) {
54d2bc06	420	mutex_unlock(&dev->lock);
1da177e4	421	idmouse_delete(dev);
d4ead16f AS	422	} else {
d4ead16f AS	423	/* unlock */
54d2bc06	424	mutex_unlock(&dev->lock);
d4ead16f	425	}
1da177e4	426
1b29a375	427	dev_info(&interface->dev, "disconnected\n");
1da177e4 LT	428	}
	429
	430	static int __init usb_idmouse_init(void)
	431	{
	432	int result;
	433
1b29a375 GKH	434	printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
1b29a375 GKH	435	DRIVER_DESC "\n");
1da177e4 LT	436
	437	/* register this driver with the USB subsystem */
	438	result = usb_register(&idmouse_driver);
	439	if (result)
	440	err("Unable to register device (error %d).", result);
	441
	442	return result;
	443	}
	444
	445	static void __exit usb_idmouse_exit(void)
	446	{
	447	/* deregister this driver with the USB subsystem */
	448	usb_deregister(&idmouse_driver);
	449	}
	450
	451	module_init(usb_idmouse_init);
	452	module_exit(usb_idmouse_exit);
	453
	454	MODULE_AUTHOR(DRIVER_AUTHOR);
	455	MODULE_DESCRIPTION(DRIVER_DESC);
	456	MODULE_LICENSE("GPL");
	457