drivers/usb/misc/idmouse.c

   1 /* Siemens ID Mouse driver v0.5
   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
  14 */
  15
  16 #include <linux/config.h>
  17 #include <linux/kernel.h>
  18 #include <linux/errno.h>
  19 #include <linux/delay.h>
  20 #include <linux/init.h>
  21 #include <linux/slab.h>
  22 #include <linux/module.h>
  23 #include <linux/smp_lock.h>
  24 #include <linux/completion.h>
  25 #include <asm/uaccess.h>
  26 #include <linux/usb.h>
  27
  28 #define WIDTH 225
  29 #define HEIGHT 288
  30 #define HEADER "P5 225 288 255 "
  31 #define IMGSIZE ((WIDTH * HEIGHT) + sizeof(HEADER)-1)
  32
  33 /* Version Information */
  34 #define DRIVER_VERSION "0.5"
  35 #define DRIVER_SHORT   "idmouse"
  36 #define DRIVER_AUTHOR  "Florian 'Floe' Echtler <echtler@fs.tum.de>"
  37 #define DRIVER_DESC    "Siemens ID Mouse FingerTIP Sensor Driver"
  38
  39 /* Siemens ID Mouse */
  40 #define USB_IDMOUSE_VENDOR_ID  0x0681
  41 #define USB_IDMOUSE_PRODUCT_ID 0x0005
  42
  43 /* we still need a minor number */
  44 #define USB_IDMOUSE_MINOR_BASE 132
  45
  46 static struct usb_device_id idmouse_table[] = {
  47         {USB_DEVICE(USB_IDMOUSE_VENDOR_ID, USB_IDMOUSE_PRODUCT_ID)},
  48         {} /* null entry at the end */
  49 };
  50
  51 MODULE_DEVICE_TABLE(usb, idmouse_table);
  52
  53 /* structure to hold all of our device specific stuff */
  54 struct usb_idmouse {
  55
  56         struct usb_device *udev; /* save off the usb device pointer */
  57         struct usb_interface *interface; /* the interface for this device */
  58
  59         unsigned char *bulk_in_buffer; /* the buffer to receive data */
  60         size_t bulk_in_size; /* the size of the receive buffer */
  61         __u8 bulk_in_endpointAddr; /* the address of the bulk in endpoint */
  62
  63         int open; /* if the port is open or not */
  64         int present; /* if the device is not disconnected */
  65         struct semaphore sem; /* locks this structure */
  66
  67 };
  68
  69 /* local function prototypes */
  70 static ssize_t idmouse_read(struct file *file, char __user *buffer,
  71                                 size_t count, loff_t * ppos);
  72
  73 static int idmouse_open(struct inode *inode, struct file *file);
  74 static int idmouse_release(struct inode *inode, struct file *file);
  75
  76 static int idmouse_probe(struct usb_interface *interface,
  77                                 const struct usb_device_id *id);
  78
  79 static void idmouse_disconnect(struct usb_interface *interface);
  80
  81 /* file operation pointers */
  82 static struct file_operations idmouse_fops = {
  83         .owner = THIS_MODULE,
  84         .read = idmouse_read,
  85         .open = idmouse_open,
  86         .release = idmouse_release,
  87 };
  88
  89 /* class driver information for devfs */
  90 static struct usb_class_driver idmouse_class = {
  91         .name = "usb/idmouse%d",
  92         .fops = &idmouse_fops,
  93         .mode = S_IFCHR | S_IRUSR | S_IRGRP | S_IROTH, /* filemode (char, 444) */
  94         .minor_base = USB_IDMOUSE_MINOR_BASE,
  95 };
  96
  97 /* usb specific object needed to register this driver with the usb subsystem */
  98 static struct usb_driver idmouse_driver = {
  99         .owner = THIS_MODULE,
 100         .name = DRIVER_SHORT,
 101         .probe = idmouse_probe,
 102         .disconnect = idmouse_disconnect,
 103         .id_table = idmouse_table,
 104 };
 105
 106 // prevent races between open() and disconnect()
 107 static DECLARE_MUTEX(disconnect_sem);
 108
 109 static int idmouse_create_image(struct usb_idmouse *dev)
 110 {
 111         int bytes_read = 0;
 112         int bulk_read = 0;
 113         int result = 0;
 114
 115         if (dev->bulk_in_size < sizeof(HEADER))
 116                 return -ENOMEM;
 117
 118         memcpy(dev->bulk_in_buffer,HEADER,sizeof(HEADER)-1);
 119         bytes_read += sizeof(HEADER)-1;
 120
 121         /* Dump the setup packets. Yes, they are uncommented, simply
 122            because they were sniffed under Windows using SnoopyPro.
 123            I _guess_ that 0x22 is a kind of reset command and 0x21
 124            means init..
 125         */
 126         result = usb_control_msg (dev->udev, usb_sndctrlpipe (dev->udev, 0),
 127                                 0x21, 0x42, 0x0001, 0x0002, NULL, 0, 1000);
 128         if (result < 0)
 129                 return result;
 130         result = usb_control_msg (dev->udev, usb_sndctrlpipe (dev->udev, 0),
 131                                 0x20, 0x42, 0x0001, 0x0002, NULL, 0, 1000);
 132         if (result < 0)
 133                 return result;
 134         result = usb_control_msg (dev->udev, usb_sndctrlpipe (dev->udev, 0),
 135                                 0x22, 0x42, 0x0000, 0x0002, NULL, 0, 1000);
 136         if (result < 0)
 137                 return result;
 138
 139         result = usb_control_msg (dev->udev, usb_sndctrlpipe (dev->udev, 0),
 140                                 0x21, 0x42, 0x0001, 0x0002, NULL, 0, 1000);
 141         if (result < 0)
 142                 return result;
 143         result = usb_control_msg (dev->udev, usb_sndctrlpipe (dev->udev, 0),
 144                                 0x20, 0x42, 0x0001, 0x0002, NULL, 0, 1000);
 145         if (result < 0)
 146                 return result;
 147         result = usb_control_msg (dev->udev, usb_sndctrlpipe (dev->udev, 0),
 148                                 0x20, 0x42, 0x0000, 0x0002, NULL, 0, 1000);
 149         if (result < 0)
 150                 return result;
 151
 152         /* loop over a blocking bulk read to get data from the device */
 153         while (bytes_read < IMGSIZE) {
 154                 result = usb_bulk_msg (dev->udev,
 155                                 usb_rcvbulkpipe (dev->udev, dev->bulk_in_endpointAddr),
 156                                 dev->bulk_in_buffer + bytes_read,
 157                                 dev->bulk_in_size, &bulk_read, 5000);
 158                 if (result < 0)
 159                         return result;
 160                 if (signal_pending(current))
 161                         return -EINTR;
 162                 bytes_read += bulk_read;
 163         }
 164
 165         /* reset the device */
 166         result = usb_control_msg (dev->udev, usb_sndctrlpipe (dev->udev, 0),
 167                                 0x22, 0x42, 0x0000, 0x0002, NULL, 0, 1000);
 168         if (result < 0)
 169                 return result;
 170
 171         /* should be IMGSIZE == 64815 */
 172         dbg("read %d bytes fingerprint data", bytes_read);
 173         return 0;
 174 }
 175
 176 static inline void idmouse_delete(struct usb_idmouse *dev)
 177 {
 178         kfree(dev->bulk_in_buffer);
 179         kfree(dev);
 180 }
 181
 182 static int idmouse_open(struct inode *inode, struct file *file)
 183 {
 184         struct usb_idmouse *dev = NULL;
 185         struct usb_interface *interface;
 186         int result = 0;
 187
 188         /* prevent disconnects */
 189         down(&disconnect_sem);
 190
 191         /* get the interface from minor number and driver information */
 192         interface = usb_find_interface (&idmouse_driver, iminor (inode));
 193         if (!interface) {
 194                 up(&disconnect_sem);
 195                 return -ENODEV;
 196         }
 197         /* get the device information block from the interface */
 198         dev = usb_get_intfdata(interface);
 199         if (!dev) {
 200                 up(&disconnect_sem);
 201                 return -ENODEV;
 202         }
 203
 204         /* lock this device */
 205         down(&dev->sem);
 206
 207         /* check if already open */
 208         if (dev->open) {
 209
 210                 /* already open, so fail */
 211                 result = -EBUSY;
 212
 213         } else {
 214
 215                 /* create a new image and check for success */
 216                 result = idmouse_create_image (dev);
 217                 if (result)
 218                         goto error;
 219
 220                 /* increment our usage count for the driver */
 221                 ++dev->open;
 222
 223                 /* save our object in the file's private structure */
 224                 file->private_data = dev;
 225
 226         }
 227
 228 error:
 229
 230         /* unlock this device */
 231         up(&dev->sem);
 232
 233         /* unlock the disconnect semaphore */
 234         up(&disconnect_sem);
 235         return result;
 236 }
 237
 238 static int idmouse_release(struct inode *inode, struct file *file)
 239 {
 240         struct usb_idmouse *dev;
 241
 242         /* prevent a race condition with open() */
 243         down(&disconnect_sem);
 244
 245         dev = (struct usb_idmouse *) file->private_data;
 246
 247         if (dev == NULL) {
 248                 up(&disconnect_sem);
 249                 return -ENODEV;
 250         }
 251
 252         /* lock our device */
 253         down(&dev->sem);
 254
 255         /* are we really open? */
 256         if (dev->open <= 0) {
 257                 up(&dev->sem);
 258                 up(&disconnect_sem);
 259                 return -ENODEV;
 260         }
 261
 262         --dev->open;
 263
 264         if (!dev->present) {
 265                 /* the device was unplugged before the file was released */
 266                 up(&dev->sem);
 267                 idmouse_delete(dev);
 268                 up(&disconnect_sem);
 269                 return 0;
 270         }
 271
 272         up(&dev->sem);
 273         up(&disconnect_sem);
 274         return 0;
 275 }
 276
 277 static ssize_t idmouse_read(struct file *file, char __user *buffer, size_t count,
 278                                 loff_t * ppos)
 279 {
 280         struct usb_idmouse *dev;
 281         int result = 0;
 282
 283         dev = (struct usb_idmouse *) file->private_data;
 284
 285         // lock this object
 286         down (&dev->sem);
 287
 288         // verify that the device wasn't unplugged
 289         if (!dev->present) {
 290                 up (&dev->sem);
 291                 return -ENODEV;
 292         }
 293
 294         if (*ppos >= IMGSIZE) {
 295                 up (&dev->sem);
 296                 return 0;
 297         }
 298
 299         if (count > IMGSIZE - *ppos)
 300                 count = IMGSIZE - *ppos;
 301
 302         if (copy_to_user (buffer, dev->bulk_in_buffer + *ppos, count)) {
 303                 result = -EFAULT;
 304         } else {
 305                 result = count;
 306                 *ppos += count;
 307         }
 308
 309         // unlock the device
 310         up(&dev->sem);
 311         return result;
 312 }
 313
 314 static int idmouse_probe(struct usb_interface *interface,
 315                                 const struct usb_device_id *id)
 316 {
 317         struct usb_device *udev = interface_to_usbdev(interface);
 318         struct usb_idmouse *dev = NULL;
 319         struct usb_host_interface *iface_desc;
 320         struct usb_endpoint_descriptor *endpoint;
 321         size_t buffer_size;
 322         int result;
 323
 324         /* check if we have gotten the data or the hid interface */
 325         iface_desc = &interface->altsetting[0];
 326         if (iface_desc->desc.bInterfaceClass != 0x0A)
 327                 return -ENODEV;
 328
 329         /* allocate memory for our device state and initialize it */
 330         dev = kmalloc(sizeof(*dev), GFP_KERNEL);
 331         if (dev == NULL)
 332                 return -ENOMEM;
 333         memset(dev, 0x00, sizeof(*dev));
 334
 335         init_MUTEX(&dev->sem);
 336         dev->udev = udev;
 337         dev->interface = interface;
 338
 339         /* set up the endpoint information - use only the first bulk-in endpoint */
 340         endpoint = &iface_desc->endpoint[0].desc;
 341         if (!dev->bulk_in_endpointAddr
 342                 && (endpoint->bEndpointAddress & USB_DIR_IN)
 343                 && ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
 344                 USB_ENDPOINT_XFER_BULK)) {
 345
 346                 /* we found a bulk in endpoint */
 347                 buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
 348                 dev->bulk_in_size = buffer_size;
 349                 dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
 350                 dev->bulk_in_buffer =
 351                         kmalloc(IMGSIZE + buffer_size, GFP_KERNEL);
 352
 353                 if (!dev->bulk_in_buffer) {
 354                         err("Unable to allocate input buffer.");
 355                         idmouse_delete(dev);
 356                         return -ENOMEM;
 357                 }
 358         }
 359
 360         if (!(dev->bulk_in_endpointAddr)) {
 361                 err("Unable to find bulk-in endpoint.");
 362                 idmouse_delete(dev);
 363                 return -ENODEV;
 364         }
 365         /* allow device read, write and ioctl */
 366         dev->present = 1;
 367
 368         /* we can register the device now, as it is ready */
 369         usb_set_intfdata(interface, dev);
 370         result = usb_register_dev(interface, &idmouse_class);
 371         if (result) {
 372                 /* something prevented us from registering this device */
 373                 err("Unble to allocate minor number.");
 374                 usb_set_intfdata(interface, NULL);
 375                 idmouse_delete(dev);
 376                 return result;
 377         }
 378
 379         /* be noisy */
 380         dev_info(&interface->dev,"%s now attached\n",DRIVER_DESC);
 381
 382         return 0;
 383 }
 384
 385 static void idmouse_disconnect(struct usb_interface *interface)
 386 {
 387         struct usb_idmouse *dev;
 388
 389         /* prevent races with open() */
 390         down(&disconnect_sem);
 391
 392         /* get device structure */
 393         dev = usb_get_intfdata(interface);
 394         usb_set_intfdata(interface, NULL);
 395
 396         /* lock it */
 397         down(&dev->sem);
 398
 399         /* give back our minor */
 400         usb_deregister_dev(interface, &idmouse_class);
 401
 402         /* prevent device read, write and ioctl */
 403         dev->present = 0;
 404
 405         /* unlock */
 406         up(&dev->sem);
 407
 408         /* if the device is opened, idmouse_release will clean this up */
 409         if (!dev->open)
 410                 idmouse_delete(dev);
 411
 412         up(&disconnect_sem);
 413
 414         info("%s disconnected", DRIVER_DESC);
 415 }
 416
 417 static int __init usb_idmouse_init(void)
 418 {
 419         int result;
 420
 421         info(DRIVER_DESC " " DRIVER_VERSION);
 422
 423         /* register this driver with the USB subsystem */
 424         result = usb_register(&idmouse_driver);
 425         if (result)
 426                 err("Unable to register device (error %d).", result);
 427
 428         return result;
 429 }
 430
 431 static void __exit usb_idmouse_exit(void)
 432 {
 433         /* deregister this driver with the USB subsystem */
 434         usb_deregister(&idmouse_driver);
 435 }
 436
 437 module_init(usb_idmouse_init);
 438 module_exit(usb_idmouse_exit);
 439
 440 MODULE_AUTHOR(DRIVER_AUTHOR);
 441 MODULE_DESCRIPTION(DRIVER_DESC);
 442 MODULE_LICENSE("GPL");
 443