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 const 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 static DEFINE_MUTEX(open_disc_mutex);
  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 */
  78         size_t bulk_in_size; /* the maximum bulk packet size */
  79         size_t orig_bi_size; /* same as above, but reported by the device */
  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 */
  84         struct mutex lock; /* locks this structure */
  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);
  99 static int idmouse_suspend(struct usb_interface *intf, pm_message_t message);
 100 static int idmouse_resume(struct usb_interface *intf);
 101
 102 /* file operation pointers */
 103 static const struct file_operations idmouse_fops = {
 104         .owner = THIS_MODULE,
 105         .read = idmouse_read,
 106         .open = idmouse_open,
 107         .release = idmouse_release,
 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         dbg("read %d bytes fingerprint data", bytes_read);
 203         return result;
 204 }
 205
 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
 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 {
 225         struct usb_idmouse *dev;
 226         struct usb_interface *interface;
 227         int result;
 228
 229         /* get the interface from minor number and driver information */
 230         interface = usb_find_interface (&idmouse_driver, iminor (inode));
 231         if (!interface)
 232                 return -ENODEV;
 233
 234         mutex_lock(&open_disc_mutex);
 235         /* get the device information block from the interface */
 236         dev = usb_get_intfdata(interface);
 237         if (!dev) {
 238                 mutex_unlock(&open_disc_mutex);
 239                 return -ENODEV;
 240         }
 241
 242         /* lock this device */
 243         mutex_lock(&dev->lock);
 244         mutex_unlock(&open_disc_mutex);
 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 */
 255                 result = usb_autopm_get_interface(interface);
 256                 if (result)
 257                         goto error;
 258                 result = idmouse_create_image (dev);
 259                 if (result)
 260                         goto error;
 261                 usb_autopm_put_interface(interface);
 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 */
 274         mutex_unlock(&dev->lock);
 275         return result;
 276 }
 277
 278 static int idmouse_release(struct inode *inode, struct file *file)
 279 {
 280         struct usb_idmouse *dev;
 281
 282         dev = file->private_data;
 283
 284         if (dev == NULL)
 285                 return -ENODEV;
 286
 287         mutex_lock(&open_disc_mutex);
 288         /* lock our device */
 289         mutex_lock(&dev->lock);
 290
 291         /* are we really open? */
 292         if (dev->open <= 0) {
 293                 mutex_unlock(&dev->lock);
 294                 mutex_unlock(&open_disc_mutex);
 295                 return -ENODEV;
 296         }
 297
 298         --dev->open;
 299
 300         if (!dev->present) {
 301                 /* the device was unplugged before the file was released */
 302                 mutex_unlock(&dev->lock);
 303                 mutex_unlock(&open_disc_mutex);
 304                 idmouse_delete(dev);
 305         } else {
 306                 mutex_unlock(&dev->lock);
 307                 mutex_unlock(&open_disc_mutex);
 308         }
 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 {
 315         struct usb_idmouse *dev = file->private_data;
 316         int result;
 317
 318         /* lock this object */
 319         mutex_lock(&dev->lock);
 320
 321         /* verify that the device wasn't unplugged */
 322         if (!dev->present) {
 323                 mutex_unlock(&dev->lock);
 324                 return -ENODEV;
 325         }
 326
 327         result = simple_read_from_buffer(buffer, count, ppos,
 328                                         dev->bulk_in_buffer, IMGSIZE);
 329         /* unlock the device */
 330         mutex_unlock(&dev->lock);
 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);
 338         struct usb_idmouse *dev;
 339         struct usb_host_interface *iface_desc;
 340         struct usb_endpoint_descriptor *endpoint;
 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 */
 349         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 350         if (dev == NULL)
 351                 return -ENOMEM;
 352
 353         mutex_init(&dev->lock);
 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;
 359         if (!dev->bulk_in_endpointAddr && usb_endpoint_is_bulk_in(endpoint)) {
 360                 /* we found a bulk in endpoint */
 361                 dev->orig_bi_size = le16_to_cpu(endpoint->wMaxPacketSize);
 362                 dev->bulk_in_size = 0x200; /* works _much_ faster */
 363                 dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
 364                 dev->bulk_in_buffer =
 365                         kmalloc(IMGSIZE + dev->bulk_in_size, GFP_KERNEL);
 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
 403         /* get device structure */
 404         dev = usb_get_intfdata(interface);
 405
 406         /* give back our minor */
 407         usb_deregister_dev(interface, &idmouse_class);
 408
 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);
 414
 415         /* prevent device read, write and ioctl */
 416         dev->present = 0;
 417
 418         /* if the device is opened, idmouse_release will clean this up */
 419         if (!dev->open) {
 420                 mutex_unlock(&dev->lock);
 421                 idmouse_delete(dev);
 422         } else {
 423                 /* unlock */
 424                 mutex_unlock(&dev->lock);
 425         }
 426
 427         dev_info(&interface->dev, "disconnected\n");
 428 }
 429
 430 static int __init usb_idmouse_init(void)
 431 {
 432         int result;
 433
 434         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 435                DRIVER_DESC "\n");
 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