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 */
51static 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
68MODULE_DEVICE_TABLE(usb, idmouse_table);
69static DEFINE_MUTEX(open_disc_mutex);
70
71/* structure to hold all of our device specific stuff */
72struct 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 */
89static ssize_t idmouse_read(struct file *file, char __user *buffer,
90				size_t count, loff_t * ppos);
91
92static int idmouse_open(struct inode *inode, struct file *file);
93static int idmouse_release(struct inode *inode, struct file *file);
94
95static int idmouse_probe(struct usb_interface *interface,
96				const struct usb_device_id *id);
97
98static void idmouse_disconnect(struct usb_interface *interface);
99static int idmouse_suspend(struct usb_interface *intf, pm_message_t message);
100static int idmouse_resume(struct usb_interface *intf);
101
102/* file operation pointers */
103static const struct file_operations idmouse_fops = {
104	.owner = THIS_MODULE,
105	.read = idmouse_read,
106	.open = idmouse_open,
107	.release = idmouse_release,
108	.llseek = default_llseek,
109};
110
111/* class driver information */
112static struct usb_class_driver idmouse_class = {
113	.name = "idmouse%d",
114	.fops = &idmouse_fops,
115	.minor_base = USB_IDMOUSE_MINOR_BASE,
116};
117
118/* usb specific object needed to register this driver with the usb subsystem */
119static struct usb_driver idmouse_driver = {
120	.name = DRIVER_SHORT,
121	.probe = idmouse_probe,
122	.disconnect = idmouse_disconnect,
123	.suspend = idmouse_suspend,
124	.resume = idmouse_resume,
125	.reset_resume = idmouse_resume,
126	.id_table = idmouse_table,
127	.supports_autosuspend = 1,
128};
129
130static int idmouse_create_image(struct usb_idmouse *dev)
131{
132	int bytes_read;
133	int bulk_read;
134	int result;
135
136	memcpy(dev->bulk_in_buffer, HEADER, sizeof(HEADER)-1);
137	bytes_read = sizeof(HEADER)-1;
138
139	/* reset the device and set a fast blink rate */
140	result = ftip_command(dev, FTIP_RELEASE, 0, 0);
141	if (result < 0)
142		goto reset;
143	result = ftip_command(dev, FTIP_BLINK,   1, 0);
144	if (result < 0)
145		goto reset;
146
147	/* initialize the sensor - sending this command twice */
148	/* significantly reduces the rate of failed reads     */
149	result = ftip_command(dev, FTIP_ACQUIRE, 0, 0);
150	if (result < 0)
151		goto reset;
152	result = ftip_command(dev, FTIP_ACQUIRE, 0, 0);
153	if (result < 0)
154		goto reset;
155
156	/* start the readout - sending this command twice */
157	/* presumably enables the high dynamic range mode */
158	result = ftip_command(dev, FTIP_RESET,   0, 0);
159	if (result < 0)
160		goto reset;
161	result = ftip_command(dev, FTIP_RESET,   0, 0);
162	if (result < 0)
163		goto reset;
164
165	/* loop over a blocking bulk read to get data from the device */
166	while (bytes_read < IMGSIZE) {
167		result = usb_bulk_msg (dev->udev,
168				usb_rcvbulkpipe (dev->udev, dev->bulk_in_endpointAddr),
169				dev->bulk_in_buffer + bytes_read,
170				dev->bulk_in_size, &bulk_read, 5000);
171		if (result < 0) {
172			/* Maybe this error was caused by the increased packet size? */
173			/* Reset to the original value and tell userspace to retry.  */
174			if (dev->bulk_in_size != dev->orig_bi_size) {
175				dev->bulk_in_size = dev->orig_bi_size;
176				result = -EAGAIN;
177			}
178			break;
179		}
180		if (signal_pending(current)) {
181			result = -EINTR;
182			break;
183		}
184		bytes_read += bulk_read;
185	}
186
187	/* reset the device */
188reset:
189	ftip_command(dev, FTIP_RELEASE, 0, 0);
190
191	/* check for valid image */
192	/* right border should be black (0x00) */
193	for (bytes_read = sizeof(HEADER)-1 + WIDTH-1; bytes_read < IMGSIZE; bytes_read += WIDTH)
194		if (dev->bulk_in_buffer[bytes_read] != 0x00)
195			return -EAGAIN;
196
197	/* lower border should be white (0xFF) */
198	for (bytes_read = IMGSIZE-WIDTH; bytes_read < IMGSIZE-1; bytes_read++)
199		if (dev->bulk_in_buffer[bytes_read] != 0xFF)
200			return -EAGAIN;
201
202	/* should be IMGSIZE == 65040 */
203	dbg("read %d bytes fingerprint data", bytes_read);
204	return result;
205}
206
207/* PM operations are nops as this driver does IO only during open() */
208static int idmouse_suspend(struct usb_interface *intf, pm_message_t message)
209{
210	return 0;
211}
212
213static int idmouse_resume(struct usb_interface *intf)
214{
215	return 0;
216}
217
218static inline void idmouse_delete(struct usb_idmouse *dev)
219{
220	kfree(dev->bulk_in_buffer);
221	kfree(dev);
222}
223
224static 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
272error:
273
274	/* unlock this device */
275	mutex_unlock(&dev->lock);
276	return result;
277}
278
279static 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
313static 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
335static 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			err("Unable to allocate input buffer.");
370			idmouse_delete(dev);
371			return -ENOMEM;
372		}
373	}
374
375	if (!(dev->bulk_in_endpointAddr)) {
376		err("Unable to find bulk-in endpoint.");
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		err("Unble to allocate minor number.");
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
400static 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
431module_usb_driver(idmouse_driver);
432
433MODULE_AUTHOR(DRIVER_AUTHOR);
434MODULE_DESCRIPTION(DRIVER_DESC);
435MODULE_LICENSE("GPL");
436
437