aboutsummaryrefslogtreecommitdiff
path: root/drivers/usb/serial/cyberjack.c
blob: 2916dea3ede84a2a02f8ed58f8b31c18f0fefc1b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
/*
 *  REINER SCT cyberJack pinpad/e-com USB Chipcard Reader Driver
 *
 *  Copyright (C) 2001  REINER SCT
 *  Author: Matthias Bruestle
 *
 *  Contact: support@reiner-sct.com (see MAINTAINERS)
 *
 *  This program is largely derived from work by the linux-usb group
 *  and associated source files.  Please see the usb/serial files for
 *  individual credits and copyrights.
 *
 *  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.
 *
 *  Thanks to Greg Kroah-Hartman (greg@kroah.com) for his help and
 *  patience.
 *
 *  In case of problems, please write to the contact e-mail address
 *  mentioned above.
 *
 *  Please note that later models of the cyberjack reader family are
 *  supported by a libusb-based userspace device driver.
 *
 *  Homepage: http://www.reiner-sct.de/support/treiber_cyberjack.php#linux
 */


#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/uaccess.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>

#define CYBERJACK_LOCAL_BUF_SIZE 32

#define DRIVER_AUTHOR "Matthias Bruestle"
#define DRIVER_DESC "REINER SCT cyberJack pinpad/e-com USB Chipcard Reader Driver"


#define CYBERJACK_VENDOR_ID	0x0C4B
#define CYBERJACK_PRODUCT_ID	0x0100

/* Function prototypes */
static int cyberjack_port_probe(struct usb_serial_port *port);
static int cyberjack_port_remove(struct usb_serial_port *port);
static int  cyberjack_open(struct tty_struct *tty,
	struct usb_serial_port *port);
static void cyberjack_close(struct usb_serial_port *port);
static int cyberjack_write(struct tty_struct *tty,
	struct usb_serial_port *port, const unsigned char *buf, int count);
static int cyberjack_write_room(struct tty_struct *tty);
static void cyberjack_read_int_callback(struct urb *urb);
static void cyberjack_read_bulk_callback(struct urb *urb);
static void cyberjack_write_bulk_callback(struct urb *urb);

static const struct usb_device_id id_table[] = {
	{ USB_DEVICE(CYBERJACK_VENDOR_ID, CYBERJACK_PRODUCT_ID) },
	{ }			/* Terminating entry */
};

MODULE_DEVICE_TABLE(usb, id_table);

static struct usb_serial_driver cyberjack_device = {
	.driver = {
		.owner =	THIS_MODULE,
		.name =		"cyberjack",
	},
	.description =		"Reiner SCT Cyberjack USB card reader",
	.id_table =		id_table,
	.num_ports =		1,
	.port_probe =		cyberjack_port_probe,
	.port_remove =		cyberjack_port_remove,
	.open =			cyberjack_open,
	.close =		cyberjack_close,
	.write =		cyberjack_write,
	.write_room =		cyberjack_write_room,
	.read_int_callback =	cyberjack_read_int_callback,
	.read_bulk_callback =	cyberjack_read_bulk_callback,
	.write_bulk_callback =	cyberjack_write_bulk_callback,
};

static struct usb_serial_driver * const serial_drivers[] = {
	&cyberjack_device, NULL
};

struct cyberjack_private {
	spinlock_t	lock;		/* Lock for SMP */
	short		rdtodo;		/* Bytes still to read */
	unsigned char	wrbuf[5*64];	/* Buffer for collecting data to write */
	short		wrfilled;	/* Overall data size we already got */
	short		wrsent;		/* Data already sent */
};

static int cyberjack_port_probe(struct usb_serial_port *port)
{
	struct cyberjack_private *priv;
	int result;

	priv = kmalloc(sizeof(struct cyberjack_private), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	spin_lock_init(&priv->lock);
	priv->rdtodo = 0;
	priv->wrfilled = 0;
	priv->wrsent = 0;

	usb_set_serial_port_data(port, priv);

	result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
	if (result)
		dev_err(&port->dev, "usb_submit_urb(read int) failed\n");

	return 0;
}

static int cyberjack_port_remove(struct usb_serial_port *port)
{
	struct cyberjack_private *priv;

	usb_kill_urb(port->interrupt_in_urb);

	priv = usb_get_serial_port_data(port);
	kfree(priv);

	return 0;
}

static int  cyberjack_open(struct tty_struct *tty,
					struct usb_serial_port *port)
{
	struct cyberjack_private *priv;
	unsigned long flags;
	int result = 0;

	dev_dbg(&port->dev, "%s - usb_clear_halt\n", __func__);
	usb_clear_halt(port->serial->dev, port->write_urb->pipe);

	priv = usb_get_serial_port_data(port);
	spin_lock_irqsave(&priv->lock, flags);
	priv->rdtodo = 0;
	priv->wrfilled = 0;
	priv->wrsent = 0;
	spin_unlock_irqrestore(&priv->lock, flags);

	return result;
}

static void cyberjack_close(struct usb_serial_port *port)
{
	usb_kill_urb(port->write_urb);
	usb_kill_urb(port->read_urb);
}

static int cyberjack_write(struct tty_struct *tty,
	struct usb_serial_port *port, const unsigned char *buf, int count)
{
	struct device *dev = &port->dev;
	struct cyberjack_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;
	int result;
	int wrexpected;

	if (count == 0) {
		dev_dbg(dev, "%s - write request of 0 bytes\n", __func__);
		return 0;
	}

	if (!test_and_clear_bit(0, &port->write_urbs_free)) {
		dev_dbg(dev, "%s - already writing\n", __func__);
		return 0;
	}

	spin_lock_irqsave(&priv->lock, flags);

	if (count+priv->wrfilled > sizeof(priv->wrbuf)) {
		/* To much data for buffer. Reset buffer. */
		priv->wrfilled = 0;
		spin_unlock_irqrestore(&priv->lock, flags);
		set_bit(0, &port->write_urbs_free);
		return 0;
	}

	/* Copy data */
	memcpy(priv->wrbuf + priv->wrfilled, buf, count);

	usb_serial_debug_data(dev, __func__, count, priv->wrbuf + priv->wrfilled);
	priv->wrfilled += count;

	if (priv->wrfilled >= 3) {
		wrexpected = ((int)priv->wrbuf[2]<<8)+priv->wrbuf[1]+3;
		dev_dbg(dev, "%s - expected data: %d\n", __func__, wrexpected);
	} else
		wrexpected = sizeof(priv->wrbuf);

	if (priv->wrfilled >= wrexpected) {
		/* We have enough data to begin transmission */
		int length;

		dev_dbg(dev, "%s - transmitting data (frame 1)\n", __func__);
		length = (wrexpected > port->bulk_out_size) ?
					port->bulk_out_size : wrexpected;

		memcpy(port->write_urb->transfer_buffer, priv->wrbuf, length);
		priv->wrsent = length;

		/* set up our urb */
		port->write_urb->transfer_buffer_length = length;

		/* send the data out the bulk port */
		result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
		if (result) {
			dev_err(&port->dev,
				"%s - failed submitting write urb, error %d\n",
				__func__, result);
			/* Throw away data. No better idea what to do with it. */
			priv->wrfilled = 0;
			priv->wrsent = 0;
			spin_unlock_irqrestore(&priv->lock, flags);
			set_bit(0, &port->write_urbs_free);
			return 0;
		}

		dev_dbg(dev, "%s - priv->wrsent=%d\n", __func__, priv->wrsent);
		dev_dbg(dev, "%s - priv->wrfilled=%d\n", __func__, priv->wrfilled);

		if (priv->wrsent >= priv->wrfilled) {
			dev_dbg(dev, "%s - buffer cleaned\n", __func__);
			memset(priv->wrbuf, 0, sizeof(priv->wrbuf));
			priv->wrfilled = 0;
			priv->wrsent = 0;
		}
	}

	spin_unlock_irqrestore(&priv->lock, flags);

	return count;
}

static int cyberjack_write_room(struct tty_struct *tty)
{
	/* FIXME: .... */
	return CYBERJACK_LOCAL_BUF_SIZE;
}

static void cyberjack_read_int_callback(struct urb *urb)
{
	struct usb_serial_port *port = urb->context;
	struct cyberjack_private *priv = usb_get_serial_port_data(port);
	struct device *dev = &port->dev;
	unsigned char *data = urb->transfer_buffer;
	int status = urb->status;
	int result;

	/* the urb might have been killed. */
	if (status)
		return;

	usb_serial_debug_data(dev, __func__, urb->actual_length, data);

	/* React only to interrupts signaling a bulk_in transfer */
	if (urb->actual_length == 4 && data[0] == 0x01) {
		short old_rdtodo;

		/* This is a announcement of coming bulk_ins. */
		unsigned short size = ((unsigned short)data[3]<<8)+data[2]+3;

		spin_lock(&priv->lock);

		old_rdtodo = priv->rdtodo;

		if (old_rdtodo > SHRT_MAX - size) {
			dev_dbg(dev, "To many bulk_in urbs to do.\n");
			spin_unlock(&priv->lock);
			goto resubmit;
		}

		/* "+=" is probably more fault tolerant than "=" */
		priv->rdtodo += size;

		dev_dbg(dev, "%s - rdtodo: %d\n", __func__, priv->rdtodo);

		spin_unlock(&priv->lock);

		if (!old_rdtodo) {
			result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
			if (result)
				dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
					__func__, result);
			dev_dbg(dev, "%s - usb_submit_urb(read urb)\n", __func__);
		}
	}

resubmit:
	result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
	if (result)
		dev_err(&port->dev, "usb_submit_urb(read int) failed\n");
	dev_dbg(dev, "%s - usb_submit_urb(int urb)\n", __func__);
}

static void cyberjack_read_bulk_callback(struct urb *urb)
{
	struct usb_serial_port *port = urb->context;
	struct cyberjack_private *priv = usb_get_serial_port_data(port);
	struct device *dev = &port->dev;
	unsigned char *data = urb->transfer_buffer;
	short todo;
	int result;
	int status = urb->status;

	usb_serial_debug_data(dev, __func__, urb->actual_length, data);
	if (status) {
		dev_dbg(dev, "%s - nonzero read bulk status received: %d\n",
			__func__, status);
		return;
	}

	if (urb->actual_length) {
		tty_insert_flip_string(&port->port, data, urb->actual_length);
		tty_flip_buffer_push(&port->port);
	}

	spin_lock(&priv->lock);

	/* Reduce urbs to do by one. */
	priv->rdtodo -= urb->actual_length;
	/* Just to be sure */
	if (priv->rdtodo < 0)
		priv->rdtodo = 0;
	todo = priv->rdtodo;

	spin_unlock(&priv->lock);

	dev_dbg(dev, "%s - rdtodo: %d\n", __func__, todo);

	/* Continue to read if we have still urbs to do. */
	if (todo /* || (urb->actual_length==port->bulk_in_endpointAddress)*/) {
		result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
		if (result)
			dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
				__func__, result);
		dev_dbg(dev, "%s - usb_submit_urb(read urb)\n", __func__);
	}
}

static void cyberjack_write_bulk_callback(struct urb *urb)
{
	struct usb_serial_port *port = urb->context;
	struct cyberjack_private *priv = usb_get_serial_port_data(port);
	struct device *dev = &port->dev;
	int status = urb->status;

	set_bit(0, &port->write_urbs_free);
	if (status) {
		dev_dbg(dev, "%s - nonzero write bulk status received: %d\n",
			__func__, status);
		return;
	}

	spin_lock(&priv->lock);

	/* only do something if we have more data to send */
	if (priv->wrfilled) {
		int length, blksize, result;

		dev_dbg(dev, "%s - transmitting data (frame n)\n", __func__);

		length = ((priv->wrfilled - priv->wrsent) > port->bulk_out_size) ?
			port->bulk_out_size : (priv->wrfilled - priv->wrsent);

		memcpy(port->write_urb->transfer_buffer,
					priv->wrbuf + priv->wrsent, length);
		priv->wrsent += length;

		/* set up our urb */
		port->write_urb->transfer_buffer_length = length;

		/* send the data out the bulk port */
		result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
		if (result) {
			dev_err(dev, "%s - failed submitting write urb, error %d\n",
				__func__, result);
			/* Throw away data. No better idea what to do with it. */
			priv->wrfilled = 0;
			priv->wrsent = 0;
			goto exit;
		}

		dev_dbg(dev, "%s - priv->wrsent=%d\n", __func__, priv->wrsent);
		dev_dbg(dev, "%s - priv->wrfilled=%d\n", __func__, priv->wrfilled);

		blksize = ((int)priv->wrbuf[2]<<8)+priv->wrbuf[1]+3;

		if (priv->wrsent >= priv->wrfilled ||
					priv->wrsent >= blksize) {
			dev_dbg(dev, "%s - buffer cleaned\n", __func__);
			memset(priv->wrbuf, 0, sizeof(priv->wrbuf));
			priv->wrfilled = 0;
			priv->wrsent = 0;
		}
	}

exit:
	spin_unlock(&priv->lock);
	usb_serial_port_softint(port);
}

module_usb_serial_driver(serial_drivers, id_table);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");