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

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