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Linux/drivers/usb/serial/cyberjack.c

  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/kernel.h>
 32 #include <linux/errno.h>
 33 #include <linux/slab.h>
 34 #include <linux/tty.h>
 35 #include <linux/tty_driver.h>
 36 #include <linux/tty_flip.h>
 37 #include <linux/module.h>
 38 #include <linux/spinlock.h>
 39 #include <linux/uaccess.h>
 40 #include <linux/usb.h>
 41 #include <linux/usb/serial.h>
 42 
 43 #define CYBERJACK_LOCAL_BUF_SIZE 32
 44 
 45 #define DRIVER_AUTHOR "Matthias Bruestle"
 46 #define DRIVER_DESC "REINER SCT cyberJack pinpad/e-com USB Chipcard Reader Driver"
 47 
 48 
 49 #define CYBERJACK_VENDOR_ID     0x0C4B
 50 #define CYBERJACK_PRODUCT_ID    0x0100
 51 
 52 /* Function prototypes */
 53 static int cyberjack_attach(struct usb_serial *serial);
 54 static int cyberjack_port_probe(struct usb_serial_port *port);
 55 static int cyberjack_port_remove(struct usb_serial_port *port);
 56 static int  cyberjack_open(struct tty_struct *tty,
 57         struct usb_serial_port *port);
 58 static void cyberjack_close(struct usb_serial_port *port);
 59 static int cyberjack_write(struct tty_struct *tty,
 60         struct usb_serial_port *port, const unsigned char *buf, int count);
 61 static int cyberjack_write_room(struct tty_struct *tty);
 62 static void cyberjack_read_int_callback(struct urb *urb);
 63 static void cyberjack_read_bulk_callback(struct urb *urb);
 64 static void cyberjack_write_bulk_callback(struct urb *urb);
 65 
 66 static const struct usb_device_id id_table[] = {
 67         { USB_DEVICE(CYBERJACK_VENDOR_ID, CYBERJACK_PRODUCT_ID) },
 68         { }                     /* Terminating entry */
 69 };
 70 
 71 MODULE_DEVICE_TABLE(usb, id_table);
 72 
 73 static struct usb_serial_driver cyberjack_device = {
 74         .driver = {
 75                 .owner =        THIS_MODULE,
 76                 .name =         "cyberjack",
 77         },
 78         .description =          "Reiner SCT Cyberjack USB card reader",
 79         .id_table =             id_table,
 80         .num_ports =            1,
 81         .attach =               cyberjack_attach,
 82         .port_probe =           cyberjack_port_probe,
 83         .port_remove =          cyberjack_port_remove,
 84         .open =                 cyberjack_open,
 85         .close =                cyberjack_close,
 86         .write =                cyberjack_write,
 87         .write_room =           cyberjack_write_room,
 88         .read_int_callback =    cyberjack_read_int_callback,
 89         .read_bulk_callback =   cyberjack_read_bulk_callback,
 90         .write_bulk_callback =  cyberjack_write_bulk_callback,
 91 };
 92 
 93 static struct usb_serial_driver * const serial_drivers[] = {
 94         &cyberjack_device, NULL
 95 };
 96 
 97 struct cyberjack_private {
 98         spinlock_t      lock;           /* Lock for SMP */
 99         short           rdtodo;         /* Bytes still to read */
100         unsigned char   wrbuf[5*64];    /* Buffer for collecting data to write */
101         short           wrfilled;       /* Overall data size we already got */
102         short           wrsent;         /* Data already sent */
103 };
104 
105 static int cyberjack_attach(struct usb_serial *serial)
106 {
107         if (serial->num_bulk_out < serial->num_ports)
108                 return -ENODEV;
109 
110         return 0;
111 }
112 
113 static int cyberjack_port_probe(struct usb_serial_port *port)
114 {
115         struct cyberjack_private *priv;
116         int result;
117 
118         priv = kmalloc(sizeof(struct cyberjack_private), GFP_KERNEL);
119         if (!priv)
120                 return -ENOMEM;
121 
122         spin_lock_init(&priv->lock);
123         priv->rdtodo = 0;
124         priv->wrfilled = 0;
125         priv->wrsent = 0;
126 
127         usb_set_serial_port_data(port, priv);
128 
129         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
130         if (result)
131                 dev_err(&port->dev, "usb_submit_urb(read int) failed\n");
132 
133         return 0;
134 }
135 
136 static int cyberjack_port_remove(struct usb_serial_port *port)
137 {
138         struct cyberjack_private *priv;
139 
140         usb_kill_urb(port->interrupt_in_urb);
141 
142         priv = usb_get_serial_port_data(port);
143         kfree(priv);
144 
145         return 0;
146 }
147 
148 static int  cyberjack_open(struct tty_struct *tty,
149                                         struct usb_serial_port *port)
150 {
151         struct cyberjack_private *priv;
152         unsigned long flags;
153 
154         dev_dbg(&port->dev, "%s - usb_clear_halt\n", __func__);
155         usb_clear_halt(port->serial->dev, port->write_urb->pipe);
156 
157         priv = usb_get_serial_port_data(port);
158         spin_lock_irqsave(&priv->lock, flags);
159         priv->rdtodo = 0;
160         priv->wrfilled = 0;
161         priv->wrsent = 0;
162         spin_unlock_irqrestore(&priv->lock, flags);
163 
164         return 0;
165 }
166 
167 static void cyberjack_close(struct usb_serial_port *port)
168 {
169         usb_kill_urb(port->write_urb);
170         usb_kill_urb(port->read_urb);
171 }
172 
173 static int cyberjack_write(struct tty_struct *tty,
174         struct usb_serial_port *port, const unsigned char *buf, int count)
175 {
176         struct device *dev = &port->dev;
177         struct cyberjack_private *priv = usb_get_serial_port_data(port);
178         unsigned long flags;
179         int result;
180         int wrexpected;
181 
182         if (count == 0) {
183                 dev_dbg(dev, "%s - write request of 0 bytes\n", __func__);
184                 return 0;
185         }
186 
187         if (!test_and_clear_bit(0, &port->write_urbs_free)) {
188                 dev_dbg(dev, "%s - already writing\n", __func__);
189                 return 0;
190         }
191 
192         spin_lock_irqsave(&priv->lock, flags);
193 
194         if (count+priv->wrfilled > sizeof(priv->wrbuf)) {
195                 /* To much data for buffer. Reset buffer. */
196                 priv->wrfilled = 0;
197                 spin_unlock_irqrestore(&priv->lock, flags);
198                 set_bit(0, &port->write_urbs_free);
199                 return 0;
200         }
201 
202         /* Copy data */
203         memcpy(priv->wrbuf + priv->wrfilled, buf, count);
204 
205         usb_serial_debug_data(dev, __func__, count, priv->wrbuf + priv->wrfilled);
206         priv->wrfilled += count;
207 
208         if (priv->wrfilled >= 3) {
209                 wrexpected = ((int)priv->wrbuf[2]<<8)+priv->wrbuf[1]+3;
210                 dev_dbg(dev, "%s - expected data: %d\n", __func__, wrexpected);
211         } else
212                 wrexpected = sizeof(priv->wrbuf);
213 
214         if (priv->wrfilled >= wrexpected) {
215                 /* We have enough data to begin transmission */
216                 int length;
217 
218                 dev_dbg(dev, "%s - transmitting data (frame 1)\n", __func__);
219                 length = (wrexpected > port->bulk_out_size) ?
220                                         port->bulk_out_size : wrexpected;
221 
222                 memcpy(port->write_urb->transfer_buffer, priv->wrbuf, length);
223                 priv->wrsent = length;
224 
225                 /* set up our urb */
226                 port->write_urb->transfer_buffer_length = length;
227 
228                 /* send the data out the bulk port */
229                 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
230                 if (result) {
231                         dev_err(&port->dev,
232                                 "%s - failed submitting write urb, error %d\n",
233                                 __func__, result);
234                         /* Throw away data. No better idea what to do with it. */
235                         priv->wrfilled = 0;
236                         priv->wrsent = 0;
237                         spin_unlock_irqrestore(&priv->lock, flags);
238                         set_bit(0, &port->write_urbs_free);
239                         return 0;
240                 }
241 
242                 dev_dbg(dev, "%s - priv->wrsent=%d\n", __func__, priv->wrsent);
243                 dev_dbg(dev, "%s - priv->wrfilled=%d\n", __func__, priv->wrfilled);
244 
245                 if (priv->wrsent >= priv->wrfilled) {
246                         dev_dbg(dev, "%s - buffer cleaned\n", __func__);
247                         memset(priv->wrbuf, 0, sizeof(priv->wrbuf));
248                         priv->wrfilled = 0;
249                         priv->wrsent = 0;
250                 }
251         }
252 
253         spin_unlock_irqrestore(&priv->lock, flags);
254 
255         return count;
256 }
257 
258 static int cyberjack_write_room(struct tty_struct *tty)
259 {
260         /* FIXME: .... */
261         return CYBERJACK_LOCAL_BUF_SIZE;
262 }
263 
264 static void cyberjack_read_int_callback(struct urb *urb)
265 {
266         struct usb_serial_port *port = urb->context;
267         struct cyberjack_private *priv = usb_get_serial_port_data(port);
268         struct device *dev = &port->dev;
269         unsigned char *data = urb->transfer_buffer;
270         int status = urb->status;
271         int result;
272 
273         /* the urb might have been killed. */
274         if (status)
275                 return;
276 
277         usb_serial_debug_data(dev, __func__, urb->actual_length, data);
278 
279         /* React only to interrupts signaling a bulk_in transfer */
280         if (urb->actual_length == 4 && data[0] == 0x01) {
281                 short old_rdtodo;
282 
283                 /* This is a announcement of coming bulk_ins. */
284                 unsigned short size = ((unsigned short)data[3]<<8)+data[2]+3;
285 
286                 spin_lock(&priv->lock);
287 
288                 old_rdtodo = priv->rdtodo;
289 
290                 if (old_rdtodo > SHRT_MAX - size) {
291                         dev_dbg(dev, "To many bulk_in urbs to do.\n");
292                         spin_unlock(&priv->lock);
293                         goto resubmit;
294                 }
295 
296                 /* "+=" is probably more fault tolerant than "=" */
297                 priv->rdtodo += size;
298 
299                 dev_dbg(dev, "%s - rdtodo: %d\n", __func__, priv->rdtodo);
300 
301                 spin_unlock(&priv->lock);
302 
303                 if (!old_rdtodo) {
304                         result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
305                         if (result)
306                                 dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
307                                         __func__, result);
308                         dev_dbg(dev, "%s - usb_submit_urb(read urb)\n", __func__);
309                 }
310         }
311 
312 resubmit:
313         result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
314         if (result)
315                 dev_err(&port->dev, "usb_submit_urb(read int) failed\n");
316         dev_dbg(dev, "%s - usb_submit_urb(int urb)\n", __func__);
317 }
318 
319 static void cyberjack_read_bulk_callback(struct urb *urb)
320 {
321         struct usb_serial_port *port = urb->context;
322         struct cyberjack_private *priv = usb_get_serial_port_data(port);
323         struct device *dev = &port->dev;
324         unsigned char *data = urb->transfer_buffer;
325         short todo;
326         int result;
327         int status = urb->status;
328 
329         usb_serial_debug_data(dev, __func__, urb->actual_length, data);
330         if (status) {
331                 dev_dbg(dev, "%s - nonzero read bulk status received: %d\n",
332                         __func__, status);
333                 return;
334         }
335 
336         if (urb->actual_length) {
337                 tty_insert_flip_string(&port->port, data, urb->actual_length);
338                 tty_flip_buffer_push(&port->port);
339         }
340 
341         spin_lock(&priv->lock);
342 
343         /* Reduce urbs to do by one. */
344         priv->rdtodo -= urb->actual_length;
345         /* Just to be sure */
346         if (priv->rdtodo < 0)
347                 priv->rdtodo = 0;
348         todo = priv->rdtodo;
349 
350         spin_unlock(&priv->lock);
351 
352         dev_dbg(dev, "%s - rdtodo: %d\n", __func__, todo);
353 
354         /* Continue to read if we have still urbs to do. */
355         if (todo /* || (urb->actual_length==port->bulk_in_endpointAddress)*/) {
356                 result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
357                 if (result)
358                         dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
359                                 __func__, result);
360                 dev_dbg(dev, "%s - usb_submit_urb(read urb)\n", __func__);
361         }
362 }
363 
364 static void cyberjack_write_bulk_callback(struct urb *urb)
365 {
366         struct usb_serial_port *port = urb->context;
367         struct cyberjack_private *priv = usb_get_serial_port_data(port);
368         struct device *dev = &port->dev;
369         int status = urb->status;
370 
371         set_bit(0, &port->write_urbs_free);
372         if (status) {
373                 dev_dbg(dev, "%s - nonzero write bulk status received: %d\n",
374                         __func__, status);
375                 return;
376         }
377 
378         spin_lock(&priv->lock);
379 
380         /* only do something if we have more data to send */
381         if (priv->wrfilled) {
382                 int length, blksize, result;
383 
384                 dev_dbg(dev, "%s - transmitting data (frame n)\n", __func__);
385 
386                 length = ((priv->wrfilled - priv->wrsent) > port->bulk_out_size) ?
387                         port->bulk_out_size : (priv->wrfilled - priv->wrsent);
388 
389                 memcpy(port->write_urb->transfer_buffer,
390                                         priv->wrbuf + priv->wrsent, length);
391                 priv->wrsent += length;
392 
393                 /* set up our urb */
394                 port->write_urb->transfer_buffer_length = length;
395 
396                 /* send the data out the bulk port */
397                 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
398                 if (result) {
399                         dev_err(dev, "%s - failed submitting write urb, error %d\n",
400                                 __func__, result);
401                         /* Throw away data. No better idea what to do with it. */
402                         priv->wrfilled = 0;
403                         priv->wrsent = 0;
404                         goto exit;
405                 }
406 
407                 dev_dbg(dev, "%s - priv->wrsent=%d\n", __func__, priv->wrsent);
408                 dev_dbg(dev, "%s - priv->wrfilled=%d\n", __func__, priv->wrfilled);
409 
410                 blksize = ((int)priv->wrbuf[2]<<8)+priv->wrbuf[1]+3;
411 
412                 if (priv->wrsent >= priv->wrfilled ||
413                                         priv->wrsent >= blksize) {
414                         dev_dbg(dev, "%s - buffer cleaned\n", __func__);
415                         memset(priv->wrbuf, 0, sizeof(priv->wrbuf));
416                         priv->wrfilled = 0;
417                         priv->wrsent = 0;
418                 }
419         }
420 
421 exit:
422         spin_unlock(&priv->lock);
423         usb_serial_port_softint(port);
424 }
425 
426 module_usb_serial_driver(serial_drivers, id_table);
427 
428 MODULE_AUTHOR(DRIVER_AUTHOR);
429 MODULE_DESCRIPTION(DRIVER_DESC);
430 MODULE_LICENSE("GPL");
431 

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