idmouse.c 10.8 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43
/* Siemens ID Mouse driver v0.5

  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)

*/

#include <linux/config.h>
#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 <asm/uaccess.h>
#include <linux/usb.h>

#define WIDTH 225
#define HEIGHT 288
#define HEADER "P5 225 288 255 "
#define IMGSIZE ((WIDTH * HEIGHT) + sizeof(HEADER)-1)

/* Version Information */
#define DRIVER_VERSION "0.5"
#define DRIVER_SHORT   "idmouse"
#define DRIVER_AUTHOR  "Florian 'Floe' Echtler <echtler@fs.tum.de>"
#define DRIVER_DESC    "Siemens ID Mouse FingerTIP Sensor Driver"

/* Siemens ID Mouse */
#define USB_IDMOUSE_VENDOR_ID  0x0681
#define USB_IDMOUSE_PRODUCT_ID 0x0005

/* we still need a minor number */
44
#define USB_IDMOUSE_MINOR_BASE 132
45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69

static struct usb_device_id idmouse_table[] = {
	{USB_DEVICE(USB_IDMOUSE_VENDOR_ID, USB_IDMOUSE_PRODUCT_ID)},
	{} /* null entry at the end */
};

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 size of the receive buffer */
	__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 */
70
static ssize_t idmouse_read(struct file *file, char __user *buffer,
71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276
				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 struct file_operations idmouse_fops = {
	.owner = THIS_MODULE,
	.read = idmouse_read,
	.open = idmouse_open,
	.release = idmouse_release,
};

/* class driver information for devfs */
static struct usb_class_driver idmouse_class = {
	.name = "usb/idmouse%d",
	.fops = &idmouse_fops,
	.mode = S_IFCHR | S_IRUSR | S_IRGRP | S_IROTH, /* filemode (char, 444) */
	.minor_base = USB_IDMOUSE_MINOR_BASE,
};

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

// prevent races between open() and disconnect()
static DECLARE_MUTEX(disconnect_sem);

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

	if (dev->bulk_in_size < sizeof(HEADER))
		return -ENOMEM;

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

	/* Dump the setup packets. Yes, they are uncommented, simply 
	   because they were sniffed under Windows using SnoopyPro.
	   I _guess_ that 0x22 is a kind of reset command and 0x21 
	   means init..
	*/
	result = usb_control_msg (dev->udev, usb_sndctrlpipe (dev->udev, 0),
				0x21, 0x42, 0x0001, 0x0002, NULL, 0, HZ);
	if (result < 0)
		return result;
	result = usb_control_msg (dev->udev, usb_sndctrlpipe (dev->udev, 0),
				0x20, 0x42, 0x0001, 0x0002, NULL, 0, HZ);
	if (result < 0)
		return result;
	result = usb_control_msg (dev->udev, usb_sndctrlpipe (dev->udev, 0),
				0x22, 0x42, 0x0000, 0x0002, NULL, 0, HZ);
	if (result < 0)
		return result;

	result = usb_control_msg (dev->udev, usb_sndctrlpipe (dev->udev, 0),
				0x21, 0x42, 0x0001, 0x0002, NULL, 0, HZ);
	if (result < 0)
		return result;
	result = usb_control_msg (dev->udev, usb_sndctrlpipe (dev->udev, 0),
				0x20, 0x42, 0x0001, 0x0002, NULL, 0, HZ);
	if (result < 0)
		return result;
	result = usb_control_msg (dev->udev, usb_sndctrlpipe (dev->udev, 0),
				0x20, 0x42, 0x0000, 0x0002, NULL, 0, HZ);
	if (result < 0)
		return result;

	/* 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, HZ * 5);
		if (result < 0)
			return result;
		if (signal_pending(current))
			return -EINTR;
		bytes_read += bulk_read;
	}

	/* reset the device */
	result = usb_control_msg (dev->udev, usb_sndctrlpipe (dev->udev, 0),
				0x22, 0x42, 0x0000, 0x0002, NULL, 0, HZ);
	if (result < 0)
		return result;

	/* should be IMGSIZE == 64815 */
	dbg("read %d bytes fingerprint data", bytes_read);
	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 = NULL;
	struct usb_interface *interface;
	int result = 0;

	/* prevent disconnects */
	down(&disconnect_sem);

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

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

	/* prevent a race condition with open() */
	down(&disconnect_sem);

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

	if (dev == NULL) {
		up(&disconnect_sem);
		return -ENODEV;
	}

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

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

	--dev->open;

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

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

277
static ssize_t idmouse_read(struct file *file, char __user *buffer, size_t count,
278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345
				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;
	}

	if (*ppos >= IMGSIZE) {
		up (&dev->sem);
		return 0;
	}

	count = min ((loff_t)count, IMGSIZE - (*ppos));

	if (copy_to_user (buffer, dev->bulk_in_buffer + *ppos, count)) {
		result = -EFAULT;
	} else {
		result = count;
		*ppos += count;
	}

	// 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;
	size_t buffer_size;
	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 = kmalloc(sizeof(*dev), GFP_KERNEL);
	if (dev == NULL)
		return -ENOMEM;
	memset(dev, 0x00, sizeof(*dev));

	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
		&& (endpoint->bEndpointAddress & USB_DIR_IN)
		&& ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
		USB_ENDPOINT_XFER_BULK)) {

		/* we found a bulk in endpoint */
346
		buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442
		dev->bulk_in_size = buffer_size;
		dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
		dev->bulk_in_buffer =
			kmalloc(IMGSIZE + buffer_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() */
	down(&disconnect_sem);

	/* 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);

	up(&disconnect_sem);

	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");