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/slab.h>
  23 #include <linux/module.h>
  24 #include <linux/completion.h>
  25 #include <linux/mutex.h>
  26 #include <asm/uaccess.h>
  27 #include <linux/usb.h>
  28
  29 /* image constants */
  30 #define WIDTH 225
  31 #define HEIGHT 289
  32 #define HEADER "P5 225 289 255 "
  33 #define IMGSIZE ((WIDTH * HEIGHT) + sizeof(HEADER)-1)
  34
  35 /* version information */
  36 #define DRIVER_VERSION "0.6"
  37 #define DRIVER_SHORT   "idmouse"
  38 #define DRIVER_AUTHOR  "Florian 'Floe' Echtler <echtler@fs.tum.de>"
  39 #define DRIVER_DESC    "Siemens ID Mouse FingerTIP Sensor Driver"
  40
  41 /* minor number for misc USB devices */
  42 #define USB_IDMOUSE_MINOR_BASE 132
  43
  44 /* vendor and device IDs */
  45 #define ID_SIEMENS 0x0681
  46 #define ID_IDMOUSE 0x0005
  47 #define ID_CHERRY  0x0010
  48
  49 /* device ID table */
  50 static const struct usb_device_id idmouse_table[] = {
  51         {USB_DEVICE(ID_SIEMENS, ID_IDMOUSE)}, /* Siemens ID Mouse (Professional) */
  52         {USB_DEVICE(ID_SIEMENS, ID_CHERRY )}, /* Cherry FingerTIP ID Board       */
  53         {}                                    /* terminating null entry          */
  54 };
  55
  56 /* sensor commands */
  57 #define FTIP_RESET   0x20
  58 #define FTIP_ACQUIRE 0x21
  59 #define FTIP_RELEASE 0x22
  60 #define FTIP_BLINK   0x23  /* LSB of value = blink pulse width */
  61 #define FTIP_SCROLL  0x24
  62
  63 #define ftip_command(dev, command, value, index) \
  64         usb_control_msg (dev->udev, usb_sndctrlpipe (dev->udev, 0), command, \
  65         USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT, value, index, NULL, 0, 1000)
  66
  67 MODULE_DEVICE_TABLE(usb, idmouse_table);
  68 static DEFINE_MUTEX(open_disc_mutex);
  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 mutex lock; /* 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 static int idmouse_suspend(struct usb_interface *intf, pm_message_t message);
  99 static int idmouse_resume(struct usb_interface *intf);
 100
 101 /* file operation pointers */
 102 static const struct file_operations idmouse_fops = {
 103         .owner = THIS_MODULE,
 104         .read = idmouse_read,
 105         .open = idmouse_open,
 106         .release = idmouse_release,
 107         .llseek = default_llseek,
 108 };
 109
 110 /* class driver information */
 111 static struct usb_class_driver idmouse_class = {
 112         .name = "idmouse%d",
 113         .fops = &idmouse_fops,
 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 = {
 119         .name = DRIVER_SHORT,
 120         .probe = idmouse_probe,
 121         .disconnect = idmouse_disconnect,
 122         .suspend = idmouse_suspend,
 123         .resume = idmouse_resume,
 124         .reset_resume = idmouse_resume,
 125         .id_table = idmouse_table,
 126         .supports_autosuspend = 1,
 127 };
 128
 129 static int idmouse_create_image(struct usb_idmouse *dev)
 130 {
 131         int bytes_read;
 132         int bulk_read;
 133         int result;
 134
 135         memcpy(dev->bulk_in_buffer, HEADER, sizeof(HEADER)-1);
 136         bytes_read = sizeof(HEADER)-1;
 137
 138         /* reset the device and set a fast blink rate */
 139         result = ftip_command(dev, FTIP_RELEASE, 0, 0);
 140         if (result < 0)
 141                 goto reset;
 142         result = ftip_command(dev, FTIP_BLINK,   1, 0);
 143         if (result < 0)
 144                 goto reset;
 145
 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);
 149         if (result < 0)
 150                 goto reset;
 151         result = ftip_command(dev, FTIP_ACQUIRE, 0, 0);
 152         if (result < 0)
 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);
 158         if (result < 0)
 159                 goto reset;
 160         result = ftip_command(dev, FTIP_RESET,   0, 0);
 161         if (result < 0)
 162                 goto reset;
 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);
 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                 }
 183                 bytes_read += bulk_read;
 184         }
 185
 186         /* reset the device */
 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;
 195
 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 */
 202         dev_dbg(&dev->interface->dev, "read %d bytes fingerprint data\n",
 203                 bytes_read);
 204         return result;
 205 }
 206
 207 /* PM operations are nops as this driver does IO only during open() */
 208 static int idmouse_suspend(struct usb_interface *intf, pm_message_t message)
 209 {
 210         return 0;
 211 }
 212
 213 static int idmouse_resume(struct usb_interface *intf)
 214 {
 215         return 0;
 216 }
 217
 218 static inline void idmouse_delete(struct usb_idmouse *dev)
 219 {
 220         kfree(dev->bulk_in_buffer);
 221         kfree(dev);
 222 }
 223
 224 static int idmouse_open(struct inode *inode, struct file *file)
 225 {
 226         struct usb_idmouse *dev;
 227         struct usb_interface *interface;
 228         int result;
 229
 230         /* get the interface from minor number and driver information */
 231         interface = usb_find_interface (&idmouse_driver, iminor (inode));
 232         if (!interface)
 233                 return -ENODEV;
 234
 235         mutex_lock(&open_disc_mutex);
 236         /* get the device information block from the interface */
 237         dev = usb_get_intfdata(interface);
 238         if (!dev) {
 239                 mutex_unlock(&open_disc_mutex);
 240                 return -ENODEV;
 241         }
 242
 243         /* lock this device */
 244         mutex_lock(&dev->lock);
 245         mutex_unlock(&open_disc_mutex);
 246
 247         /* check if already open */
 248         if (dev->open) {
 249
 250                 /* already open, so fail */
 251                 result = -EBUSY;
 252
 253         } else {
 254
 255                 /* create a new image and check for success */
 256                 result = usb_autopm_get_interface(interface);
 257                 if (result)
 258                         goto error;
 259                 result = idmouse_create_image (dev);
 260                 if (result)
 261                         goto error;
 262                 usb_autopm_put_interface(interface);
 263
 264                 /* increment our usage count for the driver */
 265                 ++dev->open;
 266
 267                 /* save our object in the file's private structure */
 268                 file->private_data = dev;
 269
 270         }
 271
 272 error:
 273
 274         /* unlock this device */
 275         mutex_unlock(&dev->lock);
 276         return result;
 277 }
 278
 279 static int idmouse_release(struct inode *inode, struct file *file)
 280 {
 281         struct usb_idmouse *dev;
 282
 283         dev = file->private_data;
 284
 285         if (dev == NULL)
 286                 return -ENODEV;
 287
 288         mutex_lock(&open_disc_mutex);
 289         /* lock our device */
 290         mutex_lock(&dev->lock);
 291
 292         /* are we really open? */
 293         if (dev->open <= 0) {
 294                 mutex_unlock(&dev->lock);
 295                 mutex_unlock(&open_disc_mutex);
 296                 return -ENODEV;
 297         }
 298
 299         --dev->open;
 300
 301         if (!dev->present) {
 302                 /* the device was unplugged before the file was released */
 303                 mutex_unlock(&dev->lock);
 304                 mutex_unlock(&open_disc_mutex);
 305                 idmouse_delete(dev);
 306         } else {
 307                 mutex_unlock(&dev->lock);
 308                 mutex_unlock(&open_disc_mutex);
 309         }
 310         return 0;
 311 }
 312
 313 static ssize_t idmouse_read(struct file *file, char __user *buffer, size_t count,
 314                                 loff_t * ppos)
 315 {
 316         struct usb_idmouse *dev = file->private_data;
 317         int result;
 318
 319         /* lock this object */
 320         mutex_lock(&dev->lock);
 321
 322         /* verify that the device wasn't unplugged */
 323         if (!dev->present) {
 324                 mutex_unlock(&dev->lock);
 325                 return -ENODEV;
 326         }
 327
 328         result = simple_read_from_buffer(buffer, count, ppos,
 329                                         dev->bulk_in_buffer, IMGSIZE);
 330         /* unlock the device */
 331         mutex_unlock(&dev->lock);
 332         return result;
 333 }
 334
 335 static int idmouse_probe(struct usb_interface *interface,
 336                                 const struct usb_device_id *id)
 337 {
 338         struct usb_device *udev = interface_to_usbdev(interface);
 339         struct usb_idmouse *dev;
 340         struct usb_host_interface *iface_desc;
 341         struct usb_endpoint_descriptor *endpoint;
 342         int result;
 343
 344         /* check if we have gotten the data or the hid interface */
 345         iface_desc = &interface->altsetting[0];
 346         if (iface_desc->desc.bInterfaceClass != 0x0A)
 347                 return -ENODEV;
 348
 349         /* allocate memory for our device state and initialize it */
 350         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 351         if (dev == NULL)
 352                 return -ENOMEM;
 353
 354         mutex_init(&dev->lock);
 355         dev->udev = udev;
 356         dev->interface = interface;
 357
 358         /* set up the endpoint information - use only the first bulk-in endpoint */
 359         endpoint = &iface_desc->endpoint[0].desc;
 360         if (!dev->bulk_in_endpointAddr && usb_endpoint_is_bulk_in(endpoint)) {
 361                 /* we found a bulk in endpoint */
 362                 dev->orig_bi_size = usb_endpoint_maxp(endpoint);
 363                 dev->bulk_in_size = 0x200; /* works _much_ faster */
 364                 dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
 365                 dev->bulk_in_buffer =
 366                         kmalloc(IMGSIZE + dev->bulk_in_size, GFP_KERNEL);
 367
 368                 if (!dev->bulk_in_buffer) {
 369                         dev_err(&interface->dev, "Unable to allocate input buffer.\n");
 370                         idmouse_delete(dev);
 371                         return -ENOMEM;
 372                 }
 373         }
 374
 375         if (!(dev->bulk_in_endpointAddr)) {
 376                 dev_err(&interface->dev, "Unable to find bulk-in endpoint.\n");
 377                 idmouse_delete(dev);
 378                 return -ENODEV;
 379         }
 380         /* allow device read, write and ioctl */
 381         dev->present = 1;
 382
 383         /* we can register the device now, as it is ready */
 384         usb_set_intfdata(interface, dev);
 385         result = usb_register_dev(interface, &idmouse_class);
 386         if (result) {
 387                 /* something prevented us from registering this device */
 388                 dev_err(&interface->dev, "Unable to allocate minor number.\n");
 389                 usb_set_intfdata(interface, NULL);
 390                 idmouse_delete(dev);
 391                 return result;
 392         }
 393
 394         /* be noisy */
 395         dev_info(&interface->dev,"%s now attached\n",DRIVER_DESC);
 396
 397         return 0;
 398 }
 399
 400 static void idmouse_disconnect(struct usb_interface *interface)
 401 {
 402         struct usb_idmouse *dev;
 403
 404         /* get device structure */
 405         dev = usb_get_intfdata(interface);
 406
 407         /* give back our minor */
 408         usb_deregister_dev(interface, &idmouse_class);
 409
 410         mutex_lock(&open_disc_mutex);
 411         usb_set_intfdata(interface, NULL);
 412         /* lock the device */
 413         mutex_lock(&dev->lock);
 414         mutex_unlock(&open_disc_mutex);
 415
 416         /* prevent device read, write and ioctl */
 417         dev->present = 0;
 418
 419         /* if the device is opened, idmouse_release will clean this up */
 420         if (!dev->open) {
 421                 mutex_unlock(&dev->lock);
 422                 idmouse_delete(dev);
 423         } else {
 424                 /* unlock */
 425                 mutex_unlock(&dev->lock);
 426         }
 427
 428         dev_info(&interface->dev, "disconnected\n");
 429 }
 430
 431 module_usb_driver(idmouse_driver);
 432
 433 MODULE_AUTHOR(DRIVER_AUTHOR);
 434 MODULE_DESCRIPTION(DRIVER_DESC);
 435 MODULE_LICENSE("GPL");
 436