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[PATCH] W1: possible cleanups
[linux-2.6/verdex.git] / drivers / usb / serial / cyberjack.c
blob1fd5c5a9f2efd45a38c9609f99642745dccf419c
1 /*
2 * REINER SCT cyberJack pinpad/e-com USB Chipcard Reader Driver
3 *
4 * Copyright (C) 2001 REINER SCT
5 * Author: Matthias Bruestle
6 *
7 * Contact: support@reiner-sct.com (see MAINTAINERS)
8 *
9 * This program is largely derived from work by the linux-usb group
10 * and associated source files. Please see the usb/serial files for
11 * individual credits and copyrights.
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * Thanks to Greg Kroah-Hartman (greg@kroah.com) for his help and
19 * patience.
20 *
21 * In case of problems, please write to the contact e-mail address
22 * mentioned above.
23 *
24 * Please note that later models of the cyberjack reader family are
25 * supported by a libusb-based userspace device driver.
26 *
27 * Homepage: http://www.reiner-sct.de/support/treiber_cyberjack.php#linux
28 */
29
30
31 #include <linux/config.h>
32 #include <linux/kernel.h>
33 #include <linux/errno.h>
34 #include <linux/init.h>
35 #include <linux/slab.h>
36 #include <linux/tty.h>
37 #include <linux/tty_driver.h>
38 #include <linux/tty_flip.h>
39 #include <linux/module.h>
40 #include <linux/spinlock.h>
41 #include <asm/uaccess.h>
42 #include <linux/usb.h>
43 #include "usb-serial.h"
44
45 #define CYBERJACK_LOCAL_BUF_SIZE 32
46
47 static int debug;
48
49 /*
50 * Version Information
51 */
52 #define DRIVER_VERSION "v1.01"
53 #define DRIVER_AUTHOR "Matthias Bruestle"
54 #define DRIVER_DESC "REINER SCT cyberJack pinpad/e-com USB Chipcard Reader Driver"
55
56
57 #define CYBERJACK_VENDOR_ID 0x0C4B
58 #define CYBERJACK_PRODUCT_ID 0x0100
59
60 /* Function prototypes */
61 static int cyberjack_startup (struct usb_serial *serial);
62 static void cyberjack_shutdown (struct usb_serial *serial);
63 static int cyberjack_open (struct usb_serial_port *port, struct file *filp);
64 static void cyberjack_close (struct usb_serial_port *port, struct file *filp);
65 static int cyberjack_write (struct usb_serial_port *port, const unsigned char *buf, int count);
66 static int cyberjack_write_room( struct usb_serial_port *port );
67 static void cyberjack_read_int_callback (struct urb *urb, struct pt_regs *regs);
68 static void cyberjack_read_bulk_callback (struct urb *urb, struct pt_regs *regs);
69 static void cyberjack_write_bulk_callback (struct urb *urb, struct pt_regs *regs);
70
71 static struct usb_device_id id_table [] = {
72 { USB_DEVICE(CYBERJACK_VENDOR_ID, CYBERJACK_PRODUCT_ID) },
73 { } /* Terminating entry */
74 };
75
76 MODULE_DEVICE_TABLE (usb, id_table);
77
78 static struct usb_driver cyberjack_driver = {
79 .name = "cyberjack",
80 .probe = usb_serial_probe,
81 .disconnect = usb_serial_disconnect,
82 .id_table = id_table,
83 .no_dynamic_id = 1,
84 };
85
86 static struct usb_serial_driver cyberjack_device = {
87 .driver = {
88 .owner = THIS_MODULE,
89 .name = "cyberjack",
90 },
91 .description = "Reiner SCT Cyberjack USB card reader",
92 .id_table = id_table,
93 .num_interrupt_in = 1,
94 .num_bulk_in = 1,
95 .num_bulk_out = 1,
96 .num_ports = 1,
97 .attach = cyberjack_startup,
98 .shutdown = cyberjack_shutdown,
99 .open = cyberjack_open,
100 .close = cyberjack_close,
101 .write = cyberjack_write,
102 .write_room = cyberjack_write_room,
103 .read_int_callback = cyberjack_read_int_callback,
104 .read_bulk_callback = cyberjack_read_bulk_callback,
105 .write_bulk_callback = cyberjack_write_bulk_callback,
106 };
107
108 struct cyberjack_private {
109 spinlock_t lock; /* Lock for SMP */
110 short rdtodo; /* Bytes still to read */
111 unsigned char wrbuf[5*64]; /* Buffer for collecting data to write */
112 short wrfilled; /* Overall data size we already got */
113 short wrsent; /* Data already sent */
114 };
115
116 /* do some startup allocations not currently performed by usb_serial_probe() */
117 static int cyberjack_startup (struct usb_serial *serial)
118 {
119 struct cyberjack_private *priv;
120 int i;
121
122 dbg("%s", __FUNCTION__);
123
124 /* allocate the private data structure */
125 priv = kmalloc(sizeof(struct cyberjack_private), GFP_KERNEL);
126 if (!priv)
127 return -ENOMEM;
128
129 /* set initial values */
130 spin_lock_init(&priv->lock);
131 priv->rdtodo = 0;
132 priv->wrfilled = 0;
133 priv->wrsent = 0;
134 usb_set_serial_port_data(serial->port[0], priv);
135
136 init_waitqueue_head(&serial->port[0]->write_wait);
137
138 for (i = 0; i < serial->num_ports; ++i) {
139 int result;
140 serial->port[i]->interrupt_in_urb->dev = serial->dev;
141 result = usb_submit_urb(serial->port[i]->interrupt_in_urb,
142 GFP_KERNEL);
143 if (result)
144 err(" usb_submit_urb(read int) failed");
145 dbg("%s - usb_submit_urb(int urb)", __FUNCTION__);
146 }
147
148 return( 0 );
149 }
150
151 static void cyberjack_shutdown (struct usb_serial *serial)
152 {
153 int i;
154
155 dbg("%s", __FUNCTION__);
156
157 for (i=0; i < serial->num_ports; ++i) {
158 usb_kill_urb(serial->port[i]->interrupt_in_urb);
159 /* My special items, the standard routines free my urbs */
160 kfree(usb_get_serial_port_data(serial->port[i]));
161 usb_set_serial_port_data(serial->port[i], NULL);
162 }
163 }
164
165 static int cyberjack_open (struct usb_serial_port *port, struct file *filp)
166 {
167 struct cyberjack_private *priv;
168 unsigned long flags;
169 int result = 0;
170
171 dbg("%s - port %d", __FUNCTION__, port->number);
172
173 dbg("%s - usb_clear_halt", __FUNCTION__ );
174 usb_clear_halt(port->serial->dev, port->write_urb->pipe);
175
176 /* force low_latency on so that our tty_push actually forces
177 * the data through, otherwise it is scheduled, and with high
178 * data rates (like with OHCI) data can get lost.
179 */
180 port->tty->low_latency = 1;
181
182 priv = usb_get_serial_port_data(port);
183 spin_lock_irqsave(&priv->lock, flags);
184 priv->rdtodo = 0;
185 priv->wrfilled = 0;
186 priv->wrsent = 0;
187 spin_unlock_irqrestore(&priv->lock, flags);
188
189 return result;
190 }
191
192 static void cyberjack_close (struct usb_serial_port *port, struct file *filp)
193 {
194 dbg("%s - port %d", __FUNCTION__, port->number);
195
196 if (port->serial->dev) {
197 /* shutdown any bulk reads that might be going on */
198 usb_kill_urb(port->write_urb);
199 usb_kill_urb(port->read_urb);
200 }
201 }
202
203 static int cyberjack_write (struct usb_serial_port *port, const unsigned char *buf, int count)
204 {
205 struct usb_serial *serial = port->serial;
206 struct cyberjack_private *priv = usb_get_serial_port_data(port);
207 unsigned long flags;
208 int result;
209 int wrexpected;
210
211 dbg("%s - port %d", __FUNCTION__, port->number);
212
213 if (count == 0) {
214 dbg("%s - write request of 0 bytes", __FUNCTION__);
215 return (0);
216 }
217
218 spin_lock(&port->lock);
219 if (port->write_urb_busy) {
220 spin_unlock(&port->lock);
221 dbg("%s - already writing", __FUNCTION__);
222 return 0;
223 }
224 port->write_urb_busy = 1;
225 spin_unlock(&port->lock);
226
227 spin_lock_irqsave(&priv->lock, flags);
228
229 if( (count+priv->wrfilled)>sizeof(priv->wrbuf) ) {
230 /* To much data for buffer. Reset buffer. */
231 priv->wrfilled=0;
232 spin_unlock_irqrestore(&priv->lock, flags);
233 port->write_urb_busy = 0;
234 return (0);
235 }
236
237 /* Copy data */
238 memcpy (priv->wrbuf+priv->wrfilled, buf, count);
239
240 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count,
241 priv->wrbuf+priv->wrfilled);
242 priv->wrfilled += count;
243
244 if( priv->wrfilled >= 3 ) {
245 wrexpected = ((int)priv->wrbuf[2]<<8)+priv->wrbuf[1]+3;
246 dbg("%s - expected data: %d", __FUNCTION__, wrexpected);
247 } else {
248 wrexpected = sizeof(priv->wrbuf);
249 }
250
251 if( priv->wrfilled >= wrexpected ) {
252 /* We have enough data to begin transmission */
253 int length;
254
255 dbg("%s - transmitting data (frame 1)", __FUNCTION__);
256 length = (wrexpected > port->bulk_out_size) ? port->bulk_out_size : wrexpected;
257
258 memcpy (port->write_urb->transfer_buffer, priv->wrbuf, length );
259 priv->wrsent=length;
260
261 /* set up our urb */
262 usb_fill_bulk_urb(port->write_urb, serial->dev,
263 usb_sndbulkpipe(serial->dev, port->bulk_out_endpointAddress),
264 port->write_urb->transfer_buffer, length,
265 ((serial->type->write_bulk_callback) ?
266 serial->type->write_bulk_callback :
267 cyberjack_write_bulk_callback),
268 port);
269
270 /* send the data out the bulk port */
271 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
272 if (result) {
273 err("%s - failed submitting write urb, error %d", __FUNCTION__, result);
274 /* Throw away data. No better idea what to do with it. */
275 priv->wrfilled=0;
276 priv->wrsent=0;
277 spin_unlock_irqrestore(&priv->lock, flags);
278 port->write_urb_busy = 0;
279 return 0;
280 }
281
282 dbg("%s - priv->wrsent=%d", __FUNCTION__,priv->wrsent);
283 dbg("%s - priv->wrfilled=%d", __FUNCTION__,priv->wrfilled);
284
285 if( priv->wrsent>=priv->wrfilled ) {
286 dbg("%s - buffer cleaned", __FUNCTION__);
287 memset( priv->wrbuf, 0, sizeof(priv->wrbuf) );
288 priv->wrfilled=0;
289 priv->wrsent=0;
290 }
291 }
292
293 spin_unlock_irqrestore(&priv->lock, flags);
294
295 return (count);
296 }
297
298 static int cyberjack_write_room( struct usb_serial_port *port )
299 {
300 return CYBERJACK_LOCAL_BUF_SIZE;
301 }
302
303 static void cyberjack_read_int_callback( struct urb *urb, struct pt_regs *regs )
304 {
305 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
306 struct cyberjack_private *priv = usb_get_serial_port_data(port);
307 unsigned char *data = urb->transfer_buffer;
308 int result;
309
310 dbg("%s - port %d", __FUNCTION__, port->number);
311
312 /* the urb might have been killed. */
313 if (urb->status)
314 return;
315
316 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
317
318 /* React only to interrupts signaling a bulk_in transfer */
319 if( (urb->actual_length==4) && (data[0]==0x01) ) {
320 short old_rdtodo;
321 int result;
322
323 /* This is a announcement of coming bulk_ins. */
324 unsigned short size = ((unsigned short)data[3]<<8)+data[2]+3;
325
326 spin_lock(&priv->lock);
327
328 old_rdtodo = priv->rdtodo;
329
330 if( (old_rdtodo+size)<(old_rdtodo) ) {
331 dbg( "To many bulk_in urbs to do." );
332 spin_unlock(&priv->lock);
333 goto resubmit;
334 }
335
336 /* "+=" is probably more fault tollerant than "=" */
337 priv->rdtodo += size;
338
339 dbg("%s - rdtodo: %d", __FUNCTION__, priv->rdtodo);
340
341 spin_unlock(&priv->lock);
342
343 if( !old_rdtodo ) {
344 port->read_urb->dev = port->serial->dev;
345 result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
346 if( result )
347 err("%s - failed resubmitting read urb, error %d", __FUNCTION__, result);
348 dbg("%s - usb_submit_urb(read urb)", __FUNCTION__);
349 }
350 }
351
352 resubmit:
353 port->interrupt_in_urb->dev = port->serial->dev;
354 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
355 if (result)
356 err(" usb_submit_urb(read int) failed");
357 dbg("%s - usb_submit_urb(int urb)", __FUNCTION__);
358 }
359
360 static void cyberjack_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
361 {
362 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
363 struct cyberjack_private *priv = usb_get_serial_port_data(port);
364 struct tty_struct *tty;
365 unsigned char *data = urb->transfer_buffer;
366 short todo;
367 int result;
368
369 dbg("%s - port %d", __FUNCTION__, port->number);
370
371 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
372 if (urb->status) {
373 dbg("%s - nonzero read bulk status received: %d", __FUNCTION__, urb->status);
374 return;
375 }
376
377 tty = port->tty;
378 if (!tty) {
379 dbg("%s - ignoring since device not open\n", __FUNCTION__);
380 return;
381 }
382 if (urb->actual_length) {
383 tty_buffer_request_room(tty, urb->actual_length);
384 tty_insert_flip_string(tty, data, urb->actual_length);
385 tty_flip_buffer_push(tty);
386 }
387
388 spin_lock(&priv->lock);
389
390 /* Reduce urbs to do by one. */
391 priv->rdtodo-=urb->actual_length;
392 /* Just to be sure */
393 if ( priv->rdtodo<0 ) priv->rdtodo = 0;
394 todo = priv->rdtodo;
395
396 spin_unlock(&priv->lock);
397
398 dbg("%s - rdtodo: %d", __FUNCTION__, todo);
399
400 /* Continue to read if we have still urbs to do. */
401 if( todo /* || (urb->actual_length==port->bulk_in_endpointAddress)*/ ) {
402 port->read_urb->dev = port->serial->dev;
403 result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
404 if (result)
405 err("%s - failed resubmitting read urb, error %d", __FUNCTION__, result);
406 dbg("%s - usb_submit_urb(read urb)", __FUNCTION__);
407 }
408 }
409
410 static void cyberjack_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
411 {
412 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
413 struct cyberjack_private *priv = usb_get_serial_port_data(port);
414
415 dbg("%s - port %d", __FUNCTION__, port->number);
416
417 port->write_urb_busy = 0;
418 if (urb->status) {
419 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
420 return;
421 }
422
423 spin_lock(&priv->lock);
424
425 /* only do something if we have more data to send */
426 if( priv->wrfilled ) {
427 int length, blksize, result;
428
429 dbg("%s - transmitting data (frame n)", __FUNCTION__);
430
431 length = ((priv->wrfilled - priv->wrsent) > port->bulk_out_size) ?
432 port->bulk_out_size : (priv->wrfilled - priv->wrsent);
433
434 memcpy (port->write_urb->transfer_buffer, priv->wrbuf + priv->wrsent,
435 length );
436 priv->wrsent+=length;
437
438 /* set up our urb */
439 usb_fill_bulk_urb(port->write_urb, port->serial->dev,
440 usb_sndbulkpipe(port->serial->dev, port->bulk_out_endpointAddress),
441 port->write_urb->transfer_buffer, length,
442 ((port->serial->type->write_bulk_callback) ?
443 port->serial->type->write_bulk_callback :
444 cyberjack_write_bulk_callback),
445 port);
446
447 /* send the data out the bulk port */
448 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
449 if (result) {
450 err("%s - failed submitting write urb, error %d", __FUNCTION__, result);
451 /* Throw away data. No better idea what to do with it. */
452 priv->wrfilled=0;
453 priv->wrsent=0;
454 goto exit;
455 }
456
457 dbg("%s - priv->wrsent=%d", __FUNCTION__,priv->wrsent);
458 dbg("%s - priv->wrfilled=%d", __FUNCTION__,priv->wrfilled);
459
460 blksize = ((int)priv->wrbuf[2]<<8)+priv->wrbuf[1]+3;
461
462 if( (priv->wrsent>=priv->wrfilled) || (priv->wrsent>=blksize) ) {
463 dbg("%s - buffer cleaned", __FUNCTION__);
464 memset( priv->wrbuf, 0, sizeof(priv->wrbuf) );
465 priv->wrfilled=0;
466 priv->wrsent=0;
467 }
468 }
469
470 exit:
471 spin_unlock(&priv->lock);
472 usb_serial_port_softint(port);
473 }
474
475 static int __init cyberjack_init (void)
476 {
477 int retval;
478 retval = usb_serial_register(&cyberjack_device);
479 if (retval)
480 goto failed_usb_serial_register;
481 retval = usb_register(&cyberjack_driver);
482 if (retval)
483 goto failed_usb_register;
484
485 info(DRIVER_VERSION " " DRIVER_AUTHOR);
486 info(DRIVER_DESC);
487
488 return 0;
489 failed_usb_register:
490 usb_serial_deregister(&cyberjack_device);
491 failed_usb_serial_register:
492 return retval;
493 }
494
495 static void __exit cyberjack_exit (void)
496 {
497 usb_deregister (&cyberjack_driver);
498 usb_serial_deregister (&cyberjack_device);
499 }
500
501 module_init(cyberjack_init);
502 module_exit(cyberjack_exit);
503
504 MODULE_AUTHOR( DRIVER_AUTHOR );
505 MODULE_DESCRIPTION( DRIVER_DESC );
506 MODULE_VERSION( DRIVER_VERSION );
507 MODULE_LICENSE("GPL");
508
509 module_param(debug, bool, S_IRUGO | S_IWUSR);
510 MODULE_PARM_DESC(debug, "Debug enabled or not");
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