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 struct kref kref; 67 68 struct usb_device *udev; /* save off the usb device pointer */ 69 struct usb_interface *interface; /* the interface for this device */ 70 71 unsigned char *bulk_in_buffer; /* the buffer to receive data */ 72 size_t bulk_in_size; /* the maximum bulk packet size */ 73 size_t orig_bi_size; /* same as above, but reported by the device */ 74 __u8 bulk_in_endpointAddr; /* the address of the bulk in endpoint */ 75 76 int open; /* if the port is open or not */ 77 int present; /* if the device is not disconnected */ 78 struct mutex lock; /* locks this structure */ 79 80 }; 81 82 /* local function prototypes */ 83 static ssize_t idmouse_read(struct file *file, char __user *buffer, 84 size_t count, loff_t * ppos); 85 86 static int idmouse_open(struct inode *inode, struct file *file); 87 static int idmouse_release(struct inode *inode, struct file *file); 88 89 static int idmouse_probe(struct usb_interface *interface, 90 const struct usb_device_id *id); 91 92 static void idmouse_disconnect(struct usb_interface *interface); 93 static int idmouse_suspend(struct usb_interface *intf, pm_message_t message); 94 static int idmouse_resume(struct usb_interface *intf); 95 96 /* file operation pointers */ 97 static const struct file_operations idmouse_fops = { 98 .owner = THIS_MODULE, 99 .read = idmouse_read, 100 .open = idmouse_open, 101 .release = idmouse_release, 102 .llseek = default_llseek, 103 }; 104 105 /* class driver information */ 106 static struct usb_class_driver idmouse_class = { 107 .name = "idmouse%d", 108 .fops = &idmouse_fops, 109 .minor_base = USB_IDMOUSE_MINOR_BASE, 110 }; 111 112 /* usb specific object needed to register this driver with the usb subsystem */ 113 static struct usb_driver idmouse_driver = { 114 .name = DRIVER_SHORT, 115 .probe = idmouse_probe, 116 .disconnect = idmouse_disconnect, 117 .suspend = idmouse_suspend, 118 .resume = idmouse_resume, 119 .reset_resume = idmouse_resume, 120 .id_table = idmouse_table, 121 .supports_autosuspend = 1, 122 }; 123 124 static int idmouse_create_image(struct usb_idmouse *dev) 125 { 126 int bytes_read; 127 int bulk_read; 128 int result; 129 130 memcpy(dev->bulk_in_buffer, HEADER, sizeof(HEADER)-1); 131 bytes_read = sizeof(HEADER)-1; 132 133 /* reset the device and set a fast blink rate */ 134 result = ftip_command(dev, FTIP_RELEASE, 0, 0); 135 if (result < 0) 136 goto reset; 137 result = ftip_command(dev, FTIP_BLINK, 1, 0); 138 if (result < 0) 139 goto reset; 140 141 /* initialize the sensor - sending this command twice */ 142 /* significantly reduces the rate of failed reads */ 143 result = ftip_command(dev, FTIP_ACQUIRE, 0, 0); 144 if (result < 0) 145 goto reset; 146 result = ftip_command(dev, FTIP_ACQUIRE, 0, 0); 147 if (result < 0) 148 goto reset; 149 150 /* start the readout - sending this command twice */ 151 /* presumably enables the high dynamic range mode */ 152 result = ftip_command(dev, FTIP_RESET, 0, 0); 153 if (result < 0) 154 goto reset; 155 result = ftip_command(dev, FTIP_RESET, 0, 0); 156 if (result < 0) 157 goto reset; 158 159 /* loop over a blocking bulk read to get data from the device */ 160 while (bytes_read < IMGSIZE) { 161 result = usb_bulk_msg(dev->udev, 162 usb_rcvbulkpipe(dev->udev, dev->bulk_in_endpointAddr), 163 dev->bulk_in_buffer + bytes_read, 164 dev->bulk_in_size, &bulk_read, 5000); 165 if (result < 0) { 166 /* Maybe this error was caused by the increased packet size? */ 167 /* Reset to the original value and tell userspace to retry. */ 168 if (dev->bulk_in_size != dev->orig_bi_size) { 169 dev->bulk_in_size = dev->orig_bi_size; 170 result = -EAGAIN; 171 } 172 break; 173 } 174 if (signal_pending(current)) { 175 result = -EINTR; 176 break; 177 } 178 bytes_read += bulk_read; 179 } 180 181 /* check for valid image */ 182 /* right border should be black (0x00) */ 183 for (bytes_read = sizeof(HEADER)-1 + WIDTH-1; bytes_read < IMGSIZE; bytes_read += WIDTH) 184 if (dev->bulk_in_buffer[bytes_read] != 0x00) 185 return -EAGAIN; 186 187 /* lower border should be white (0xFF) */ 188 for (bytes_read = IMGSIZE-WIDTH; bytes_read < IMGSIZE-1; bytes_read++) 189 if (dev->bulk_in_buffer[bytes_read] != 0xFF) 190 return -EAGAIN; 191 192 /* reset the device */ 193 reset: 194 ftip_command(dev, FTIP_RELEASE, 0, 0); 195 196 /* should be IMGSIZE == 65040 */ 197 dev_dbg(&dev->interface->dev, "read %d bytes fingerprint data\n", 198 bytes_read); 199 return result; 200 } 201 202 /* PM operations are nops as this driver does IO only during open() */ 203 static int idmouse_suspend(struct usb_interface *intf, pm_message_t message) 204 { 205 return 0; 206 } 207 208 static int idmouse_resume(struct usb_interface *intf) 209 { 210 return 0; 211 } 212 213 static inline void idmouse_delete(struct kref *kref) 214 { 215 struct usb_idmouse *dev = container_of(kref, struct usb_idmouse, kref); 216 217 kfree(dev->bulk_in_buffer); 218 kfree(dev); 219 } 220 221 static int idmouse_open(struct inode *inode, struct file *file) 222 { 223 struct usb_idmouse *dev; 224 struct usb_interface *interface; 225 int result; 226 227 /* get the interface from minor number and driver information */ 228 interface = usb_find_interface(&idmouse_driver, iminor(inode)); 229 if (!interface) 230 return -ENODEV; 231 232 /* get the device information block from the interface */ 233 dev = usb_get_intfdata(interface); 234 if (!dev) 235 return -ENODEV; 236 237 /* lock this device */ 238 mutex_lock(&dev->lock); 239 240 /* check if already open */ 241 if (dev->open) { 242 243 /* already open, so fail */ 244 result = -EBUSY; 245 246 } else { 247 248 /* create a new image and check for success */ 249 result = usb_autopm_get_interface(interface); 250 if (result) 251 goto error; 252 result = idmouse_create_image(dev); 253 usb_autopm_put_interface(interface); 254 if (result) 255 goto error; 256 257 /* increment our usage count for the driver */ 258 ++dev->open; 259 260 kref_get(&dev->kref); 261 262 /* save our object in the file's private structure */ 263 file->private_data = dev; 264 265 } 266 267 error: 268 269 /* unlock this device */ 270 mutex_unlock(&dev->lock); 271 return result; 272 } 273 274 static int idmouse_release(struct inode *inode, struct file *file) 275 { 276 struct usb_idmouse *dev; 277 278 dev = file->private_data; 279 280 if (dev == NULL) 281 return -ENODEV; 282 283 /* lock our device */ 284 mutex_lock(&dev->lock); 285 --dev->open; 286 mutex_unlock(&dev->lock); 287 288 kref_put(&dev->kref, idmouse_delete); 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_obj(*dev); 334 if (dev == NULL) 335 return -ENOMEM; 336 337 kref_init(&dev->kref); 338 mutex_init(&dev->lock); 339 dev->udev = udev; 340 dev->interface = interface; 341 342 /* set up the endpoint information - use only the first bulk-in endpoint */ 343 result = usb_find_bulk_in_endpoint(iface_desc, &endpoint); 344 if (result) { 345 dev_err(&interface->dev, "Unable to find bulk-in endpoint.\n"); 346 goto err_put_kref; 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 result = -ENOMEM; 355 goto err_put_kref; 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 goto err_put_kref; 368 } 369 370 /* be noisy */ 371 dev_info(&interface->dev,"%s now attached\n",DRIVER_DESC); 372 373 return 0; 374 375 err_put_kref: 376 kref_put(&dev->kref, idmouse_delete); 377 378 return result; 379 } 380 381 static void idmouse_disconnect(struct usb_interface *interface) 382 { 383 struct usb_idmouse *dev = usb_get_intfdata(interface); 384 385 /* give back our minor */ 386 usb_deregister_dev(interface, &idmouse_class); 387 388 /* lock the device */ 389 mutex_lock(&dev->lock); 390 391 /* prevent device read, write and ioctl */ 392 dev->present = 0; 393 394 mutex_unlock(&dev->lock); 395 396 kref_put(&dev->kref, idmouse_delete); 397 398 dev_info(&interface->dev, "disconnected\n"); 399 } 400 401 module_usb_driver(idmouse_driver); 402 403 MODULE_AUTHOR(DRIVER_AUTHOR); 404 MODULE_DESCRIPTION(DRIVER_DESC); 405 MODULE_LICENSE("GPL"); 406 407