/* Siemens ID Mouse driver v0.6
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of
the License, or (at your option) any later version.
Copyright (C) 2004-5 by Florian 'Floe' Echtler <echtler@fs.tum.de>
and Andreas 'ad' Deresch <aderesch@fs.tum.de>
Derived from the USB Skeleton driver 1.1,
Copyright (C) 2003 Greg Kroah-Hartman (greg@kroah.com)
Additional information provided by Martin Reising
<Martin.Reising@natural-computing.de>
*/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/smp_lock.h>
#include <linux/completion.h>
#include <linux/mutex.h>
#include <asm/uaccess.h>
#include <linux/usb.h>
/* image constants */
#define WIDTH 225
#define HEIGHT 289
#define HEADER "P5 225 289 255 "
#define IMGSIZE ((WIDTH * HEIGHT) + sizeof(HEADER)-1)
/* version information */
#define DRIVER_VERSION "0.6"
#define DRIVER_SHORT "idmouse"
#define DRIVER_AUTHOR "Florian 'Floe' Echtler <echtler@fs.tum.de>"
#define DRIVER_DESC "Siemens ID Mouse FingerTIP Sensor Driver"
/* minor number for misc USB devices */
#define USB_IDMOUSE_MINOR_BASE 132
/* vendor and device IDs */
#define ID_SIEMENS 0x0681
#define ID_IDMOUSE 0x0005
#define ID_CHERRY 0x0010
/* device ID table */
static struct usb_device_id idmouse_table[] = {
{USB_DEVICE(ID_SIEMENS, ID_IDMOUSE)}, /* Siemens ID Mouse (Professional) */
{USB_DEVICE(ID_SIEMENS, ID_CHERRY )}, /* Cherry FingerTIP ID Board */
{} /* terminating null entry */
};
/* sensor commands */
#define FTIP_RESET 0x20
#define FTIP_ACQUIRE 0x21
#define FTIP_RELEASE 0x22
#define FTIP_BLINK 0x23 /* LSB of value = blink pulse width */
#define FTIP_SCROLL 0x24
#define ftip_command(dev, command, value, index) \
usb_control_msg (dev->udev, usb_sndctrlpipe (dev->udev, 0), command, \
USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT, value, index, NULL, 0, 1000)
MODULE_DEVICE_TABLE(usb, idmouse_table);
/* structure to hold all of our device specific stuff */
struct usb_idmouse {
struct usb_device *udev; /* save off the usb device pointer */
struct usb_interface *interface; /* the interface for this device */
unsigned char *bulk_in_buffer; /* the buffer to receive data */
size_t bulk_in_size; /* the maximum bulk packet size */
size_t orig_bi_size; /* same as above, but reported by the device */
__u8 bulk_in_endpointAddr; /* the address of the bulk in endpoint */
int open; /* if the port is open or not */
int present; /* if the device is not disconnected */
struct semaphore sem; /* locks this structure */
};
/* local function prototypes */
static ssize_t idmouse_read(struct file *file, char __user *buffer,
size_t count, loff_t * ppos);
static int idmouse_open(struct inode *inode, struct file *file);
static int idmouse_release(struct inode *inode, struct file *file);
static int idmouse_probe(struct usb_interface *interface,
const struct usb_device_id *id);
static void idmouse_disconnect(struct usb_interface *interface);
/* file operation pointers */
static struct file_operations idmouse_fops = {
.owner = THIS_MODULE,
.read = idmouse_read,
.open = idmouse_open,
.release = idmouse_release,
};
/* class driver information */
static struct usb_class_driver idmouse_class = {
.name = "idmouse%d",
.fops = &idmouse_fops,
.minor_base = USB_IDMOUSE_MINOR_BASE,
};
/* usb specific object needed to register this driver with the usb subsystem */
static struct usb_driver idmouse_driver = {
.name = DRIVER_SHORT,
.probe = idmouse_probe,
.disconnect = idmouse_disconnect,
.id_table = idmouse_table,
};
/* prevent races between open() and disconnect() */
static DEFINE_MUTEX(disconnect_mutex);
static int idmouse_create_image(struct usb_idmouse *dev)
{
int bytes_read = 0;
int bulk_read = 0;
int result = 0;
memcpy(dev->bulk_in_buffer, HEADER, sizeof(HEADER)-1);
bytes_read += sizeof(HEADER)-1;
/* reset the device and set a fast blink rate */
result = ftip_command(dev, FTIP_RELEASE, 0, 0);
if (result < 0)
goto reset;
result = ftip_command(dev, FTIP_BLINK, 1, 0);
if (result < 0)
goto reset;
/* initialize the sensor - sending this command twice */
/* significantly reduces the rate of failed reads */
result = ftip_command(dev, FTIP_ACQUIRE, 0, 0);
if (result < 0)
goto reset;
result = ftip_command(dev, FTIP_ACQUIRE, 0, 0);
if (result < 0)
goto reset;
/* start the readout - sending this command twice */
/* presumably enables the high dynamic range mode */
result = ftip_command(dev, FTIP_RESET, 0, 0);
if (result < 0)
goto reset;
result = ftip_command(dev, FTIP_RESET, 0, 0);
if (result < 0)
goto reset;
/* loop over a blocking bulk read to get data from the device */
while (bytes_read < IMGSIZE) {
result = usb_bulk_msg (dev->udev,
usb_rcvbulkpipe (dev->udev, dev->bulk_in_endpointAddr),
dev->bulk_in_buffer + bytes_read,
dev->bulk_in_size, &bulk_read, 5000);
if (result < 0) {
/* Maybe this error was caused by the increased packet size? */
/* Reset to the original value and tell userspace to retry. */
if (dev->bulk_in_size != dev->orig_bi_size) {
dev->bulk_in_size = dev->orig_bi_size;
result = -EAGAIN;
}
break;
}
if (signal_pending(current)) {
result = -EINTR;
break;
}
bytes_read += bulk_read;
}
/* reset the device */
reset:
ftip_command(dev, FTIP_RELEASE, 0, 0);
/* check for valid image */
/* right border should be black (0x00) */
for (bytes_read = sizeof(HEADER)-1 + WIDTH-1; bytes_read < IMGSIZE; bytes_read += WIDTH)
if (dev->bulk_in_buffer[bytes_read] != 0x00)
return -EAGAIN;
/* lower border should be white (0xFF) */
for (bytes_read = IMGSIZE-WIDTH; bytes_read < IMGSIZE-1; bytes_read++)
if (dev->bulk_in_buffer[bytes_read] != 0xFF)
return -EAGAIN;
/* should be IMGSIZE == 65040 */
dbg("read %d bytes fingerprint data", bytes_read);
return result;
}
static inline void idmouse_delete(struct usb_idmouse *dev)
{
kfree(dev->bulk_in_buffer);
kfree(dev);
}
static int idmouse_open(struct inode *inode, struct file *file)
{
struct usb_idmouse *dev = NULL;
struct usb_interface *interface;
int result = 0;
/* prevent disconnects */
mutex_lock(&disconnect_mutex);
/* get the interface from minor number and driver information */
interface = usb_find_interface (&idmouse_driver, iminor (inode));
if (!interface) {
mutex_unlock(&disconnect_mutex);
return -ENODEV;
}
/* get the device information block from the interface */
dev = usb_get_intfdata(interface);
if (!dev) {
mutex_unlock(&disconnect_mutex);
return -ENODEV;
}
/* lock this device */
down(&dev->sem);
/* check if already open */
if (dev->open) {
/* already open, so fail */
result = -EBUSY;
} else {
/* create a new image and check for success */
result = idmouse_create_image (dev);
if (result)
goto error;
/* increment our usage count for the driver */
++dev->open;
/* save our object in the file's private structure */
file->private_data = dev;
}
error:
/* unlock this device */
up(&dev->sem);
/* unlock the disconnect semaphore */
mutex_unlock(&disconnect_mutex);
return result;
}
static int idmouse_release(struct inode *inode, struct file *file)
{
struct usb_idmouse *dev;
/* prevent a race condition with open() */
mutex_lock(&disconnect_mutex);
dev = (struct usb_idmouse *) file->private_data;
if (dev == NULL) {
mutex_unlock(&disconnect_mutex);
return -ENODEV;
}
/* lock our device */
down(&dev->sem);
/* are we really open? */
if (dev->open <= 0) {
up(&dev->sem);
mutex_unlock(&disconnect_mutex);
return -ENODEV;
}
--dev->open;
if (!dev->present) {
/* the device was unplugged before the file was released */
up(&dev->sem);
idmouse_delete(dev);
mutex_unlock(&disconnect_mutex);
return 0;
}
up(&dev->sem);
mutex_unlock(&disconnect_mutex);
return 0;
}
static ssize_t idmouse_read(struct file *file, char __user *buffer, size_t count,
loff_t * ppos)
{
struct usb_idmouse *dev;
int result = 0;
dev = (struct usb_idmouse *) file->private_data;
/* lock this object */
down (&dev->sem);
/* verify that the device wasn't unplugged */
if (!dev->present) {
up (&dev->sem);
return -ENODEV;
}
result = simple_read_from_buffer(buffer, count, ppos,
dev->bulk_in_buffer, IMGSIZE);
/* unlock the device */
up(&dev->sem);
return result;
}
static int idmouse_probe(struct usb_interface *interface,
const struct usb_device_id *id)
{
struct usb_device *udev = interface_to_usbdev(interface);
struct usb_idmouse *dev = NULL;
struct usb_host_interface *iface_desc;
struct usb_endpoint_descriptor *endpoint;
int result;
/* check if we have gotten the data or the hid interface */
iface_desc = &interface->altsetting[0];
if (iface_desc->desc.bInterfaceClass != 0x0A)
return -ENODEV;
/* allocate memory for our device state and initialize it */
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (dev == NULL)
return -ENOMEM;
init_MUTEX(&dev->sem);
dev->udev = udev;
dev->interface = interface;
/* set up the endpoint information - use only the first bulk-in endpoint */
endpoint = &iface_desc->endpoint[0].desc;
if (!dev->bulk_in_endpointAddr
&& (endpoint->bEndpointAddress & USB_DIR_IN)
&& ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
USB_ENDPOINT_XFER_BULK)) {
/* we found a bulk in endpoint */
dev->orig_bi_size = le16_to_cpu(endpoint->wMaxPacketSize);
dev->bulk_in_size = 0x200; /* works _much_ faster */
dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
dev->bulk_in_buffer =
kmalloc(IMGSIZE + dev->bulk_in_size, GFP_KERNEL);
if (!dev->bulk_in_buffer) {
err("Unable to allocate input buffer.");
idmouse_delete(dev);
return -ENOMEM;
}
}
if (!(dev->bulk_in_endpointAddr)) {
err("Unable to find bulk-in endpoint.");
idmouse_delete(dev);
return -ENODEV;
}
/* allow device read, write and ioctl */
dev->present = 1;
/* we can register the device now, as it is ready */
usb_set_intfdata(interface, dev);
result = usb_register_dev(interface, &idmouse_class);
if (result) {
/* something prevented us from registering this device */
err("Unble to allocate minor number.");
usb_set_intfdata(interface, NULL);
idmouse_delete(dev);
return result;
}
/* be noisy */
dev_info(&interface->dev,"%s now attached\n",DRIVER_DESC);
return 0;
}
static void idmouse_disconnect(struct usb_interface *interface)
{
struct usb_idmouse *dev;
/* prevent races with open() */
mutex_lock(&disconnect_mutex);
/* get device structure */
dev = usb_get_intfdata(interface);
usb_set_intfdata(interface, NULL);
/* lock it */
down(&dev->sem);
/* give back our minor */
usb_deregister_dev(interface, &idmouse_class);
/* prevent device read, write and ioctl */
dev->present = 0;
/* unlock */
up(&dev->sem);
/* if the device is opened, idmouse_release will clean this up */
if (!dev->open)
idmouse_delete(dev);
mutex_unlock(&disconnect_mutex);
info("%s disconnected", DRIVER_DESC);
}
static int __init usb_idmouse_init(void)
{
int result;
info(DRIVER_DESC " " DRIVER_VERSION);
/* register this driver with the USB subsystem */
result = usb_register(&idmouse_driver);
if (result)
err("Unable to register device (error %d).", result);
return result;
}
static void __exit usb_idmouse_exit(void)
{
/* deregister this driver with the USB subsystem */
usb_deregister(&idmouse_driver);
}
module_init(usb_idmouse_init);
module_exit(usb_idmouse_exit);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
