drivers/usb/misc/idmouse.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /* Siemens ID Mouse driver v0.6
   3
   4   Copyright (C) 2004-5 by Florian 'Floe' Echtler  <echtler@fs.tum.de>
   5                       and Andreas  'ad'  Deresch <aderesch@fs.tum.de>
   6
   7   Derived from the USB Skeleton driver 1.1,
   8   Copyright (C) 2003 Greg Kroah-Hartman (greg@kroah.com)
   9
  10   Additional information provided by Martin Reising
  11   <Martin.Reising@natural-computing.de>
  12
  13 */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/sched/signal.h>
  17 #include <linux/errno.h>
  18 #include <linux/delay.h>
  19 #include <linux/slab.h>
  20 #include <linux/module.h>
  21 #include <linux/completion.h>
  22 #include <linux/mutex.h>
  23 #include <linux/uaccess.h>
  24 #include <linux/usb.h>
  25
  26 /* image constants */
  27 #define WIDTH 225
  28 #define HEIGHT 289
  29 #define HEADER "P5 225 289 255 "
  30 #define IMGSIZE ((WIDTH * HEIGHT) + sizeof(HEADER)-1)
  31
  32 #define DRIVER_SHORT   "idmouse"
  33 #define DRIVER_AUTHOR  "Florian 'Floe' Echtler <echtler@fs.tum.de>"
  34 #define DRIVER_DESC    "Siemens ID Mouse FingerTIP Sensor Driver"
  35
  36 /* minor number for misc USB devices */
  37 #define USB_IDMOUSE_MINOR_BASE 132
  38
  39 /* vendor and device IDs */
  40 #define ID_SIEMENS 0x0681
  41 #define ID_IDMOUSE 0x0005
  42 #define ID_CHERRY  0x0010
  43
  44 /* device ID table */
  45 static const struct usb_device_id idmouse_table[] = {
  46         {USB_DEVICE(ID_SIEMENS, ID_IDMOUSE)}, /* Siemens ID Mouse (Professional) */
  47         {USB_DEVICE(ID_SIEMENS, ID_CHERRY )}, /* Cherry FingerTIP ID Board       */
  48         {}                                    /* terminating null entry          */
  49 };
  50
  51 /* sensor commands */
  52 #define FTIP_RESET   0x20
  53 #define FTIP_ACQUIRE 0x21
  54 #define FTIP_RELEASE 0x22
  55 #define FTIP_BLINK   0x23  /* LSB of value = blink pulse width */
  56 #define FTIP_SCROLL  0x24
  57
  58 #define ftip_command(dev, command, value, index) \
  59         usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), command, \
  60         USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT, value, index, NULL, 0, 1000)
  61
  62 MODULE_DEVICE_TABLE(usb, idmouse_table);
  63
  64 /* structure to hold all of our device specific stuff */
  65 struct usb_idmouse {
  66
  67         struct usb_device *udev; /* save off the usb device pointer */
  68         struct usb_interface *interface; /* the interface for this device */
  69
  70         unsigned char *bulk_in_buffer; /* the buffer to receive data */
  71         size_t bulk_in_size; /* the maximum bulk packet size */
  72         size_t orig_bi_size; /* same as above, but reported by the device */
  73         __u8 bulk_in_endpointAddr; /* the address of the bulk in endpoint */
  74
  75         int open; /* if the port is open or not */
  76         int present; /* if the device is not disconnected */
  77         struct mutex lock; /* locks this structure */
  78
  79 };
  80
  81 /* local function prototypes */
  82 static ssize_t idmouse_read(struct file *file, char __user *buffer,
  83                                 size_t count, loff_t * ppos);
  84
  85 static int idmouse_open(struct inode *inode, struct file *file);
  86 static int idmouse_release(struct inode *inode, struct file *file);
  87
  88 static int idmouse_probe(struct usb_interface *interface,
  89                                 const struct usb_device_id *id);
  90
  91 static void idmouse_disconnect(struct usb_interface *interface);
  92 static int idmouse_suspend(struct usb_interface *intf, pm_message_t message);
  93 static int idmouse_resume(struct usb_interface *intf);
  94
  95 /* file operation pointers */
  96 static const struct file_operations idmouse_fops = {
  97         .owner = THIS_MODULE,
  98         .read = idmouse_read,
  99         .open = idmouse_open,
 100         .release = idmouse_release,
 101         .llseek = default_llseek,
 102 };
 103
 104 /* class driver information */
 105 static struct usb_class_driver idmouse_class = {
 106         .name = "idmouse%d",
 107         .fops = &idmouse_fops,
 108         .minor_base = USB_IDMOUSE_MINOR_BASE,
 109 };
 110
 111 /* usb specific object needed to register this driver with the usb subsystem */
 112 static struct usb_driver idmouse_driver = {
 113         .name = DRIVER_SHORT,
 114         .probe = idmouse_probe,
 115         .disconnect = idmouse_disconnect,
 116         .suspend = idmouse_suspend,
 117         .resume = idmouse_resume,
 118         .reset_resume = idmouse_resume,
 119         .id_table = idmouse_table,
 120         .supports_autosuspend = 1,
 121 };
 122
 123 static int idmouse_create_image(struct usb_idmouse *dev)
 124 {
 125         int bytes_read;
 126         int bulk_read;
 127         int result;
 128
 129         memcpy(dev->bulk_in_buffer, HEADER, sizeof(HEADER)-1);
 130         bytes_read = sizeof(HEADER)-1;
 131
 132         /* reset the device and set a fast blink rate */
 133         result = ftip_command(dev, FTIP_RELEASE, 0, 0);
 134         if (result < 0)
 135                 goto reset;
 136         result = ftip_command(dev, FTIP_BLINK,   1, 0);
 137         if (result < 0)
 138                 goto reset;
 139
 140         /* initialize the sensor - sending this command twice */
 141         /* significantly reduces the rate of failed reads     */
 142         result = ftip_command(dev, FTIP_ACQUIRE, 0, 0);
 143         if (result < 0)
 144                 goto reset;
 145         result = ftip_command(dev, FTIP_ACQUIRE, 0, 0);
 146         if (result < 0)
 147                 goto reset;
 148
 149         /* start the readout - sending this command twice */
 150         /* presumably enables the high dynamic range mode */
 151         result = ftip_command(dev, FTIP_RESET,   0, 0);
 152         if (result < 0)
 153                 goto reset;
 154         result = ftip_command(dev, FTIP_RESET,   0, 0);
 155         if (result < 0)
 156                 goto reset;
 157
 158         /* loop over a blocking bulk read to get data from the device */
 159         while (bytes_read < IMGSIZE) {
 160                 result = usb_bulk_msg(dev->udev,
 161                                 usb_rcvbulkpipe(dev->udev, dev->bulk_in_endpointAddr),
 162                                 dev->bulk_in_buffer + bytes_read,
 163                                 dev->bulk_in_size, &bulk_read, 5000);
 164                 if (result < 0) {
 165                         /* Maybe this error was caused by the increased packet size? */
 166                         /* Reset to the original value and tell userspace to retry.  */
 167                         if (dev->bulk_in_size != dev->orig_bi_size) {
 168                                 dev->bulk_in_size = dev->orig_bi_size;
 169                                 result = -EAGAIN;
 170                         }
 171                         break;
 172                 }
 173                 if (signal_pending(current)) {
 174                         result = -EINTR;
 175                         break;
 176                 }
 177                 bytes_read += bulk_read;
 178         }
 179
 180         /* reset the device */
 181 reset:
 182         ftip_command(dev, FTIP_RELEASE, 0, 0);
 183
 184         /* check for valid image */
 185         /* right border should be black (0x00) */
 186         for (bytes_read = sizeof(HEADER)-1 + WIDTH-1; bytes_read < IMGSIZE; bytes_read += WIDTH)
 187                 if (dev->bulk_in_buffer[bytes_read] != 0x00)
 188                         return -EAGAIN;
 189
 190         /* lower border should be white (0xFF) */
 191         for (bytes_read = IMGSIZE-WIDTH; bytes_read < IMGSIZE-1; bytes_read++)
 192                 if (dev->bulk_in_buffer[bytes_read] != 0xFF)
 193                         return -EAGAIN;
 194
 195         /* should be IMGSIZE == 65040 */
 196         dev_dbg(&dev->interface->dev, "read %d bytes fingerprint data\n",
 197                 bytes_read);
 198         return result;
 199 }
 200
 201 /* PM operations are nops as this driver does IO only during open() */
 202 static int idmouse_suspend(struct usb_interface *intf, pm_message_t message)
 203 {
 204         return 0;
 205 }
 206
 207 static int idmouse_resume(struct usb_interface *intf)
 208 {
 209         return 0;
 210 }
 211
 212 static inline void idmouse_delete(struct usb_idmouse *dev)
 213 {
 214         kfree(dev->bulk_in_buffer);
 215         kfree(dev);
 216 }
 217
 218 static int idmouse_open(struct inode *inode, struct file *file)
 219 {
 220         struct usb_idmouse *dev;
 221         struct usb_interface *interface;
 222         int result;
 223
 224         /* get the interface from minor number and driver information */
 225         interface = usb_find_interface(&idmouse_driver, iminor(inode));
 226         if (!interface)
 227                 return -ENODEV;
 228
 229         /* get the device information block from the interface */
 230         dev = usb_get_intfdata(interface);
 231         if (!dev)
 232                 return -ENODEV;
 233
 234         /* lock this device */
 235         mutex_lock(&dev->lock);
 236
 237         /* check if already open */
 238         if (dev->open) {
 239
 240                 /* already open, so fail */
 241                 result = -EBUSY;
 242
 243         } else {
 244
 245                 /* create a new image and check for success */
 246                 result = usb_autopm_get_interface(interface);
 247                 if (result)
 248                         goto error;
 249                 result = idmouse_create_image(dev);
 250                 usb_autopm_put_interface(interface);
 251                 if (result)
 252                         goto error;
 253
 254                 /* increment our usage count for the driver */
 255                 ++dev->open;
 256
 257                 /* save our object in the file's private structure */
 258                 file->private_data = dev;
 259
 260         }
 261
 262 error:
 263
 264         /* unlock this device */
 265         mutex_unlock(&dev->lock);
 266         return result;
 267 }
 268
 269 static int idmouse_release(struct inode *inode, struct file *file)
 270 {
 271         struct usb_idmouse *dev;
 272
 273         dev = file->private_data;
 274
 275         if (dev == NULL)
 276                 return -ENODEV;
 277
 278         /* lock our device */
 279         mutex_lock(&dev->lock);
 280
 281         --dev->open;
 282
 283         if (!dev->present) {
 284                 /* the device was unplugged before the file was released */
 285                 mutex_unlock(&dev->lock);
 286                 idmouse_delete(dev);
 287         } else {
 288                 mutex_unlock(&dev->lock);
 289         }
 290         return 0;
 291 }
 292
 293 static ssize_t idmouse_read(struct file *file, char __user *buffer, size_t count,
 294                                 loff_t * ppos)
 295 {
 296         struct usb_idmouse *dev = file->private_data;
 297         int result;
 298
 299         /* lock this object */
 300         mutex_lock(&dev->lock);
 301
 302         /* verify that the device wasn't unplugged */
 303         if (!dev->present) {
 304                 mutex_unlock(&dev->lock);
 305                 return -ENODEV;
 306         }
 307
 308         result = simple_read_from_buffer(buffer, count, ppos,
 309                                         dev->bulk_in_buffer, IMGSIZE);
 310         /* unlock the device */
 311         mutex_unlock(&dev->lock);
 312         return result;
 313 }
 314
 315 static int idmouse_probe(struct usb_interface *interface,
 316                                 const struct usb_device_id *id)
 317 {
 318         struct usb_device *udev = interface_to_usbdev(interface);
 319         struct usb_idmouse *dev;
 320         struct usb_host_interface *iface_desc;
 321         struct usb_endpoint_descriptor *endpoint;
 322         int result;
 323
 324         /* check if we have gotten the data or the hid interface */
 325         iface_desc = interface->cur_altsetting;
 326         if (iface_desc->desc.bInterfaceClass != 0x0A)
 327                 return -ENODEV;
 328
 329         if (iface_desc->desc.bNumEndpoints < 1)
 330                 return -ENODEV;
 331
 332         /* allocate memory for our device state and initialize it */
 333         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 334         if (dev == NULL)
 335                 return -ENOMEM;
 336
 337         mutex_init(&dev->lock);
 338         dev->udev = udev;
 339         dev->interface = interface;
 340
 341         /* set up the endpoint information - use only the first bulk-in endpoint */
 342         result = usb_find_bulk_in_endpoint(iface_desc, &endpoint);
 343         if (result) {
 344                 dev_err(&interface->dev, "Unable to find bulk-in endpoint.\n");
 345                 idmouse_delete(dev);
 346                 return result;
 347         }
 348
 349         dev->orig_bi_size = usb_endpoint_maxp(endpoint);
 350         dev->bulk_in_size = 0x200; /* works _much_ faster */
 351         dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
 352         dev->bulk_in_buffer = kmalloc(IMGSIZE + dev->bulk_in_size, GFP_KERNEL);
 353         if (!dev->bulk_in_buffer) {
 354                 idmouse_delete(dev);
 355                 return -ENOMEM;
 356         }
 357
 358         /* allow device read, write and ioctl */
 359         dev->present = 1;
 360
 361         /* we can register the device now, as it is ready */
 362         usb_set_intfdata(interface, dev);
 363         result = usb_register_dev(interface, &idmouse_class);
 364         if (result) {
 365                 /* something prevented us from registering this device */
 366                 dev_err(&interface->dev, "Unable to allocate minor number.\n");
 367                 idmouse_delete(dev);
 368                 return result;
 369         }
 370
 371         /* be noisy */
 372         dev_info(&interface->dev,"%s now attached\n",DRIVER_DESC);
 373
 374         return 0;
 375 }
 376
 377 static void idmouse_disconnect(struct usb_interface *interface)
 378 {
 379         struct usb_idmouse *dev = usb_get_intfdata(interface);
 380
 381         /* give back our minor */
 382         usb_deregister_dev(interface, &idmouse_class);
 383
 384         /* lock the device */
 385         mutex_lock(&dev->lock);
 386
 387         /* prevent device read, write and ioctl */
 388         dev->present = 0;
 389
 390         /* if the device is opened, idmouse_release will clean this up */
 391         if (!dev->open) {
 392                 mutex_unlock(&dev->lock);
 393                 idmouse_delete(dev);
 394         } else {
 395                 /* unlock */
 396                 mutex_unlock(&dev->lock);
 397         }
 398
 399         dev_info(&interface->dev, "disconnected\n");
 400 }
 401
 402 module_usb_driver(idmouse_driver);
 403
 404 MODULE_AUTHOR(DRIVER_AUTHOR);
 405 MODULE_DESCRIPTION(DRIVER_DESC);
 406 MODULE_LICENSE("GPL");
 407