drivers/usb/misc/idmouse.c

   1 /* Siemens ID Mouse driver v0.6
   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   Additional information provided by Martin Reising
  15   <Martin.Reising@natural-computing.de>
  16
  17 */
  18
  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/completion.h>
  26 #include <linux/mutex.h>
  27 #include <asm/uaccess.h>
  28 #include <linux/usb.h>
  29
  30 /* image constants */
  31 #define WIDTH 225
  32 #define HEIGHT 289
  33 #define HEADER "P5 225 289 255 "
  34 #define IMGSIZE ((WIDTH * HEIGHT) + sizeof(HEADER)-1)
  35
  36 /* version information */
  37 #define DRIVER_VERSION "0.6"
  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
  42 /* minor number for misc USB devices */
  43 #define USB_IDMOUSE_MINOR_BASE 132
  44
  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 */
  51 static struct usb_device_id idmouse_table[] = {
  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          */
  55 };
  56
  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
  68 MODULE_DEVICE_TABLE(usb, idmouse_table);
  69
  70 /* structure to hold all of our device specific stuff */
  71 struct usb_idmouse {
  72
  73         struct usb_device *udev; /* save off the usb device pointer */
  74         struct usb_interface *interface; /* the interface for this device */
  75
  76         unsigned char *bulk_in_buffer; /* the buffer to receive data */
  77         size_t bulk_in_size; /* the maximum bulk packet size */
  78         size_t orig_bi_size; /* same as above, but reported by the device */
  79         __u8 bulk_in_endpointAddr; /* the address of the bulk in endpoint */
  80
  81         int open; /* if the port is open or not */
  82         int present; /* if the device is not disconnected */
  83         struct semaphore sem; /* locks this structure */
  84
  85 };
  86
  87 /* local function prototypes */
  88 static ssize_t idmouse_read(struct file *file, char __user *buffer,
  89                                 size_t count, loff_t * ppos);
  90
  91 static int idmouse_open(struct inode *inode, struct file *file);
  92 static int idmouse_release(struct inode *inode, struct file *file);
  93
  94 static int idmouse_probe(struct usb_interface *interface,
  95                                 const struct usb_device_id *id);
  96
  97 static void idmouse_disconnect(struct usb_interface *interface);
  98
  99 /* file operation pointers */
 100 static const struct file_operations idmouse_fops = {
 101         .owner = THIS_MODULE,
 102         .read = idmouse_read,
 103         .open = idmouse_open,
 104         .release = idmouse_release,
 105 };
 106
 107 /* class driver information */
 108 static struct usb_class_driver idmouse_class = {
 109         .name = "idmouse%d",
 110         .fops = &idmouse_fops,
 111         .minor_base = USB_IDMOUSE_MINOR_BASE,
 112 };
 113
 114 /* usb specific object needed to register this driver with the usb subsystem */
 115 static struct usb_driver idmouse_driver = {
 116         .name = DRIVER_SHORT,
 117         .probe = idmouse_probe,
 118         .disconnect = idmouse_disconnect,
 119         .id_table = idmouse_table,
 120 };
 121
 122 /* prevent races between open() and disconnect() */
 123 static DEFINE_MUTEX(disconnect_mutex);
 124
 125 static int idmouse_create_image(struct usb_idmouse *dev)
 126 {
 127         int bytes_read;
 128         int bulk_read;
 129         int result;
 130
 131         memcpy(dev->bulk_in_buffer, HEADER, sizeof(HEADER)-1);
 132         bytes_read = sizeof(HEADER)-1;
 133
 134         /* reset the device and set a fast blink rate */
 135         result = ftip_command(dev, FTIP_RELEASE, 0, 0);
 136         if (result < 0)
 137                 goto reset;
 138         result = ftip_command(dev, FTIP_BLINK,   1, 0);
 139         if (result < 0)
 140                 goto reset;
 141
 142         /* initialize the sensor - sending this command twice */
 143         /* significantly reduces the rate of failed reads     */
 144         result = ftip_command(dev, FTIP_ACQUIRE, 0, 0);
 145         if (result < 0)
 146                 goto reset;
 147         result = ftip_command(dev, FTIP_ACQUIRE, 0, 0);
 148         if (result < 0)
 149                 goto reset;
 150
 151         /* start the readout - sending this command twice */
 152         /* presumably enables the high dynamic range mode */
 153         result = ftip_command(dev, FTIP_RESET,   0, 0);
 154         if (result < 0)
 155                 goto reset;
 156         result = ftip_command(dev, FTIP_RESET,   0, 0);
 157         if (result < 0)
 158                 goto reset;
 159
 160         /* loop over a blocking bulk read to get data from the device */
 161         while (bytes_read < IMGSIZE) {
 162                 result = usb_bulk_msg (dev->udev,
 163                                 usb_rcvbulkpipe (dev->udev, dev->bulk_in_endpointAddr),
 164                                 dev->bulk_in_buffer + bytes_read,
 165                                 dev->bulk_in_size, &bulk_read, 5000);
 166                 if (result < 0) {
 167                         /* Maybe this error was caused by the increased packet size? */
 168                         /* Reset to the original value and tell userspace to retry.  */
 169                         if (dev->bulk_in_size != dev->orig_bi_size) {
 170                                 dev->bulk_in_size = dev->orig_bi_size;
 171                                 result = -EAGAIN;
 172                         }
 173                         break;
 174                 }
 175                 if (signal_pending(current)) {
 176                         result = -EINTR;
 177                         break;
 178                 }
 179                 bytes_read += bulk_read;
 180         }
 181
 182         /* reset the device */
 183 reset:
 184         ftip_command(dev, FTIP_RELEASE, 0, 0);
 185
 186         /* check for valid image */
 187         /* right border should be black (0x00) */
 188         for (bytes_read = sizeof(HEADER)-1 + WIDTH-1; bytes_read < IMGSIZE; bytes_read += WIDTH)
 189                 if (dev->bulk_in_buffer[bytes_read] != 0x00)
 190                         return -EAGAIN;
 191
 192         /* lower border should be white (0xFF) */
 193         for (bytes_read = IMGSIZE-WIDTH; bytes_read < IMGSIZE-1; bytes_read++)
 194                 if (dev->bulk_in_buffer[bytes_read] != 0xFF)
 195                         return -EAGAIN;
 196
 197         /* should be IMGSIZE == 65040 */
 198         dbg("read %d bytes fingerprint data", bytes_read);
 199         return result;
 200 }
 201
 202 static inline void idmouse_delete(struct usb_idmouse *dev)
 203 {
 204         kfree(dev->bulk_in_buffer);
 205         kfree(dev);
 206 }
 207
 208 static int idmouse_open(struct inode *inode, struct file *file)
 209 {
 210         struct usb_idmouse *dev;
 211         struct usb_interface *interface;
 212         int result;
 213
 214         /* prevent disconnects */
 215         mutex_lock(&disconnect_mutex);
 216
 217         /* get the interface from minor number and driver information */
 218         interface = usb_find_interface (&idmouse_driver, iminor (inode));
 219         if (!interface) {
 220                 mutex_unlock(&disconnect_mutex);
 221                 return -ENODEV;
 222         }
 223         /* get the device information block from the interface */
 224         dev = usb_get_intfdata(interface);
 225         if (!dev) {
 226                 mutex_unlock(&disconnect_mutex);
 227                 return -ENODEV;
 228         }
 229
 230         /* lock this device */
 231         down(&dev->sem);
 232
 233         /* check if already open */
 234         if (dev->open) {
 235
 236                 /* already open, so fail */
 237                 result = -EBUSY;
 238
 239         } else {
 240
 241                 /* create a new image and check for success */
 242                 result = idmouse_create_image (dev);
 243                 if (result)
 244                         goto error;
 245
 246                 /* increment our usage count for the driver */
 247                 ++dev->open;
 248
 249                 /* save our object in the file's private structure */
 250                 file->private_data = dev;
 251
 252         }
 253
 254 error:
 255
 256         /* unlock this device */
 257         up(&dev->sem);
 258
 259         /* unlock the disconnect semaphore */
 260         mutex_unlock(&disconnect_mutex);
 261         return result;
 262 }
 263
 264 static int idmouse_release(struct inode *inode, struct file *file)
 265 {
 266         struct usb_idmouse *dev;
 267
 268         /* prevent a race condition with open() */
 269         mutex_lock(&disconnect_mutex);
 270
 271         dev = file->private_data;
 272
 273         if (dev == NULL) {
 274                 mutex_unlock(&disconnect_mutex);
 275                 return -ENODEV;
 276         }
 277
 278         /* lock our device */
 279         down(&dev->sem);
 280
 281         /* are we really open? */
 282         if (dev->open <= 0) {
 283                 up(&dev->sem);
 284                 mutex_unlock(&disconnect_mutex);
 285                 return -ENODEV;
 286         }
 287
 288         --dev->open;
 289
 290         if (!dev->present) {
 291                 /* the device was unplugged before the file was released */
 292                 up(&dev->sem);
 293                 idmouse_delete(dev);
 294                 mutex_unlock(&disconnect_mutex);
 295                 return 0;
 296         }
 297
 298         up(&dev->sem);
 299         mutex_unlock(&disconnect_mutex);
 300         return 0;
 301 }
 302
 303 static ssize_t idmouse_read(struct file *file, char __user *buffer, size_t count,
 304                                 loff_t * ppos)
 305 {
 306         struct usb_idmouse *dev = file->private_data;
 307         int result;
 308
 309         /* lock this object */
 310         down(&dev->sem);
 311
 312         /* verify that the device wasn't unplugged */
 313         if (!dev->present) {
 314                 up(&dev->sem);
 315                 return -ENODEV;
 316         }
 317
 318         result = simple_read_from_buffer(buffer, count, ppos,
 319                                         dev->bulk_in_buffer, IMGSIZE);
 320         /* unlock the device */
 321         up(&dev->sem);
 322         return result;
 323 }
 324
 325 static int idmouse_probe(struct usb_interface *interface,
 326                                 const struct usb_device_id *id)
 327 {
 328         struct usb_device *udev = interface_to_usbdev(interface);
 329         struct usb_idmouse *dev;
 330         struct usb_host_interface *iface_desc;
 331         struct usb_endpoint_descriptor *endpoint;
 332         int result;
 333
 334         /* check if we have gotten the data or the hid interface */
 335         iface_desc = &interface->altsetting[0];
 336         if (iface_desc->desc.bInterfaceClass != 0x0A)
 337                 return -ENODEV;
 338
 339         /* allocate memory for our device state and initialize it */
 340         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 341         if (dev == NULL)
 342                 return -ENOMEM;
 343
 344         init_MUTEX(&dev->sem);
 345         dev->udev = udev;
 346         dev->interface = interface;
 347
 348         /* set up the endpoint information - use only the first bulk-in endpoint */
 349         endpoint = &iface_desc->endpoint[0].desc;
 350         if (!dev->bulk_in_endpointAddr && usb_endpoint_is_bulk_in(endpoint)) {
 351                 /* we found a bulk in endpoint */
 352                 dev->orig_bi_size = le16_to_cpu(endpoint->wMaxPacketSize);
 353                 dev->bulk_in_size = 0x200; /* works _much_ faster */
 354                 dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
 355                 dev->bulk_in_buffer =
 356                         kmalloc(IMGSIZE + dev->bulk_in_size, GFP_KERNEL);
 357
 358                 if (!dev->bulk_in_buffer) {
 359                         err("Unable to allocate input buffer.");
 360                         idmouse_delete(dev);
 361                         return -ENOMEM;
 362                 }
 363         }
 364
 365         if (!(dev->bulk_in_endpointAddr)) {
 366                 err("Unable to find bulk-in endpoint.");
 367                 idmouse_delete(dev);
 368                 return -ENODEV;
 369         }
 370         /* allow device read, write and ioctl */
 371         dev->present = 1;
 372
 373         /* we can register the device now, as it is ready */
 374         usb_set_intfdata(interface, dev);
 375         result = usb_register_dev(interface, &idmouse_class);
 376         if (result) {
 377                 /* something prevented us from registering this device */
 378                 err("Unble to allocate minor number.");
 379                 usb_set_intfdata(interface, NULL);
 380                 idmouse_delete(dev);
 381                 return result;
 382         }
 383
 384         /* be noisy */
 385         dev_info(&interface->dev,"%s now attached\n",DRIVER_DESC);
 386
 387         return 0;
 388 }
 389
 390 static void idmouse_disconnect(struct usb_interface *interface)
 391 {
 392         struct usb_idmouse *dev;
 393
 394         /* prevent races with open() */
 395         mutex_lock(&disconnect_mutex);
 396
 397         /* get device structure */
 398         dev = usb_get_intfdata(interface);
 399         usb_set_intfdata(interface, NULL);
 400
 401         /* lock it */
 402         down(&dev->sem);
 403
 404         /* give back our minor */
 405         usb_deregister_dev(interface, &idmouse_class);
 406
 407         /* prevent device read, write and ioctl */
 408         dev->present = 0;
 409
 410         /* unlock */
 411         up(&dev->sem);
 412
 413         /* if the device is opened, idmouse_release will clean this up */
 414         if (!dev->open)
 415                 idmouse_delete(dev);
 416
 417         mutex_unlock(&disconnect_mutex);
 418
 419         info("%s disconnected", DRIVER_DESC);
 420 }
 421
 422 static int __init usb_idmouse_init(void)
 423 {
 424         int result;
 425
 426         info(DRIVER_DESC " " DRIVER_VERSION);
 427
 428         /* register this driver with the USB subsystem */
 429         result = usb_register(&idmouse_driver);
 430         if (result)
 431                 err("Unable to register device (error %d).", result);
 432
 433         return result;
 434 }
 435
 436 static void __exit usb_idmouse_exit(void)
 437 {
 438         /* deregister this driver with the USB subsystem */
 439         usb_deregister(&idmouse_driver);
 440 }
 441
 442 module_init(usb_idmouse_init);
 443 module_exit(usb_idmouse_exit);
 444
 445 MODULE_AUTHOR(DRIVER_AUTHOR);
 446 MODULE_DESCRIPTION(DRIVER_DESC);
 447 MODULE_LICENSE("GPL");
 448