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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * REINER SCT cyberJack pinpad/e-com USB Chipcard Reader Driver
4 *
5 * Copyright (C) 2001 REINER SCT
6 * Author: Matthias Bruestle
7 *
8 * Contact: support@reiner-sct.com (see MAINTAINERS)
9 *
10 * This program is largely derived from work by the linux-usb group
11 * and associated source files. Please see the usb/serial files for
12 * individual credits and copyrights.
13 *
14 * Thanks to Greg Kroah-Hartman (greg@kroah.com) for his help and
15 * patience.
16 *
17 * In case of problems, please write to the contact e-mail address
18 * mentioned above.
19 *
20 * Please note that later models of the cyberjack reader family are
21 * supported by a libusb-based userspace device driver.
22 *
23 * Homepage: http://www.reiner-sct.de/support/treiber_cyberjack.php#linux
24 */
25
26
27#include <linux/kernel.h>
28#include <linux/errno.h>
29#include <linux/slab.h>
30#include <linux/tty.h>
31#include <linux/tty_driver.h>
32#include <linux/tty_flip.h>
33#include <linux/module.h>
34#include <linux/spinlock.h>
35#include <linux/uaccess.h>
36#include <linux/usb.h>
37#include <linux/usb/serial.h>
38
39#define CYBERJACK_LOCAL_BUF_SIZE 32
40
41#define DRIVER_AUTHOR "Matthias Bruestle"
42#define DRIVER_DESC "REINER SCT cyberJack pinpad/e-com USB Chipcard Reader Driver"
43
44
45#define CYBERJACK_VENDOR_ID 0x0C4B
46#define CYBERJACK_PRODUCT_ID 0x0100
47
48/* Function prototypes */
49static int cyberjack_port_probe(struct usb_serial_port *port);
50static void cyberjack_port_remove(struct usb_serial_port *port);
51static int cyberjack_open(struct tty_struct *tty,
52 struct usb_serial_port *port);
53static void cyberjack_close(struct usb_serial_port *port);
54static int cyberjack_write(struct tty_struct *tty,
55 struct usb_serial_port *port, const unsigned char *buf, int count);
56static unsigned int cyberjack_write_room(struct tty_struct *tty);
57static void cyberjack_read_int_callback(struct urb *urb);
58static void cyberjack_read_bulk_callback(struct urb *urb);
59static void cyberjack_write_bulk_callback(struct urb *urb);
60
61static const struct usb_device_id id_table[] = {
62 { USB_DEVICE(CYBERJACK_VENDOR_ID, CYBERJACK_PRODUCT_ID) },
63 { } /* Terminating entry */
64};
65
66MODULE_DEVICE_TABLE(usb, id_table);
67
68static struct usb_serial_driver cyberjack_device = {
69 .driver = {
70 .owner = THIS_MODULE,
71 .name = "cyberjack",
72 },
73 .description = "Reiner SCT Cyberjack USB card reader",
74 .id_table = id_table,
75 .num_ports = 1,
76 .num_bulk_out = 1,
77 .port_probe = cyberjack_port_probe,
78 .port_remove = cyberjack_port_remove,
79 .open = cyberjack_open,
80 .close = cyberjack_close,
81 .write = cyberjack_write,
82 .write_room = cyberjack_write_room,
83 .read_int_callback = cyberjack_read_int_callback,
84 .read_bulk_callback = cyberjack_read_bulk_callback,
85 .write_bulk_callback = cyberjack_write_bulk_callback,
86};
87
88static struct usb_serial_driver * const serial_drivers[] = {
89 &cyberjack_device, NULL
90};
91
92struct cyberjack_private {
93 spinlock_t lock; /* Lock for SMP */
94 short rdtodo; /* Bytes still to read */
95 unsigned char wrbuf[5*64]; /* Buffer for collecting data to write */
96 short wrfilled; /* Overall data size we already got */
97 short wrsent; /* Data already sent */
98};
99
100static int cyberjack_port_probe(struct usb_serial_port *port)
101{
102 struct cyberjack_private *priv;
103 int result;
104
105 priv = kmalloc(sizeof(struct cyberjack_private), GFP_KERNEL);
106 if (!priv)
107 return -ENOMEM;
108
109 spin_lock_init(&priv->lock);
110 priv->rdtodo = 0;
111 priv->wrfilled = 0;
112 priv->wrsent = 0;
113
114 usb_set_serial_port_data(port, priv);
115
116 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
117 if (result)
118 dev_err(&port->dev, "usb_submit_urb(read int) failed\n");
119
120 return 0;
121}
122
123static void cyberjack_port_remove(struct usb_serial_port *port)
124{
125 struct cyberjack_private *priv;
126
127 usb_kill_urb(port->interrupt_in_urb);
128
129 priv = usb_get_serial_port_data(port);
130 kfree(priv);
131}
132
133static int cyberjack_open(struct tty_struct *tty,
134 struct usb_serial_port *port)
135{
136 struct cyberjack_private *priv;
137 unsigned long flags;
138
139 dev_dbg(&port->dev, "%s - usb_clear_halt\n", __func__);
140 usb_clear_halt(port->serial->dev, port->write_urb->pipe);
141
142 priv = usb_get_serial_port_data(port);
143 spin_lock_irqsave(&priv->lock, flags);
144 priv->rdtodo = 0;
145 priv->wrfilled = 0;
146 priv->wrsent = 0;
147 spin_unlock_irqrestore(&priv->lock, flags);
148
149 return 0;
150}
151
152static void cyberjack_close(struct usb_serial_port *port)
153{
154 usb_kill_urb(port->write_urb);
155 usb_kill_urb(port->read_urb);
156}
157
158static int cyberjack_write(struct tty_struct *tty,
159 struct usb_serial_port *port, const unsigned char *buf, int count)
160{
161 struct device *dev = &port->dev;
162 struct cyberjack_private *priv = usb_get_serial_port_data(port);
163 unsigned long flags;
164 int result;
165 int wrexpected;
166
167 if (count == 0) {
168 dev_dbg(dev, "%s - write request of 0 bytes\n", __func__);
169 return 0;
170 }
171
172 if (!test_and_clear_bit(0, &port->write_urbs_free)) {
173 dev_dbg(dev, "%s - already writing\n", __func__);
174 return 0;
175 }
176
177 spin_lock_irqsave(&priv->lock, flags);
178
179 if (count+priv->wrfilled > sizeof(priv->wrbuf)) {
180 /* To much data for buffer. Reset buffer. */
181 priv->wrfilled = 0;
182 spin_unlock_irqrestore(&priv->lock, flags);
183 set_bit(0, &port->write_urbs_free);
184 return 0;
185 }
186
187 /* Copy data */
188 memcpy(priv->wrbuf + priv->wrfilled, buf, count);
189
190 usb_serial_debug_data(dev, __func__, count, priv->wrbuf + priv->wrfilled);
191 priv->wrfilled += count;
192
193 if (priv->wrfilled >= 3) {
194 wrexpected = ((int)priv->wrbuf[2]<<8)+priv->wrbuf[1]+3;
195 dev_dbg(dev, "%s - expected data: %d\n", __func__, wrexpected);
196 } else
197 wrexpected = sizeof(priv->wrbuf);
198
199 if (priv->wrfilled >= wrexpected) {
200 /* We have enough data to begin transmission */
201 int length;
202
203 dev_dbg(dev, "%s - transmitting data (frame 1)\n", __func__);
204 length = (wrexpected > port->bulk_out_size) ?
205 port->bulk_out_size : wrexpected;
206
207 memcpy(port->write_urb->transfer_buffer, priv->wrbuf, length);
208 priv->wrsent = length;
209
210 /* set up our urb */
211 port->write_urb->transfer_buffer_length = length;
212
213 /* send the data out the bulk port */
214 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
215 if (result) {
216 dev_err(&port->dev,
217 "%s - failed submitting write urb, error %d\n",
218 __func__, result);
219 /* Throw away data. No better idea what to do with it. */
220 priv->wrfilled = 0;
221 priv->wrsent = 0;
222 spin_unlock_irqrestore(&priv->lock, flags);
223 set_bit(0, &port->write_urbs_free);
224 return 0;
225 }
226
227 dev_dbg(dev, "%s - priv->wrsent=%d\n", __func__, priv->wrsent);
228 dev_dbg(dev, "%s - priv->wrfilled=%d\n", __func__, priv->wrfilled);
229
230 if (priv->wrsent >= priv->wrfilled) {
231 dev_dbg(dev, "%s - buffer cleaned\n", __func__);
232 memset(priv->wrbuf, 0, sizeof(priv->wrbuf));
233 priv->wrfilled = 0;
234 priv->wrsent = 0;
235 }
236 }
237
238 spin_unlock_irqrestore(&priv->lock, flags);
239
240 return count;
241}
242
243static unsigned int cyberjack_write_room(struct tty_struct *tty)
244{
245 /* FIXME: .... */
246 return CYBERJACK_LOCAL_BUF_SIZE;
247}
248
249static void cyberjack_read_int_callback(struct urb *urb)
250{
251 struct usb_serial_port *port = urb->context;
252 struct cyberjack_private *priv = usb_get_serial_port_data(port);
253 struct device *dev = &port->dev;
254 unsigned char *data = urb->transfer_buffer;
255 int status = urb->status;
256 unsigned long flags;
257 int result;
258
259 /* the urb might have been killed. */
260 if (status)
261 return;
262
263 usb_serial_debug_data(dev, __func__, urb->actual_length, data);
264
265 /* React only to interrupts signaling a bulk_in transfer */
266 if (urb->actual_length == 4 && data[0] == 0x01) {
267 short old_rdtodo;
268
269 /* This is a announcement of coming bulk_ins. */
270 unsigned short size = ((unsigned short)data[3]<<8)+data[2]+3;
271
272 spin_lock_irqsave(&priv->lock, flags);
273
274 old_rdtodo = priv->rdtodo;
275
276 if (old_rdtodo > SHRT_MAX - size) {
277 dev_dbg(dev, "Too many bulk_in urbs to do.\n");
278 spin_unlock_irqrestore(&priv->lock, flags);
279 goto resubmit;
280 }
281
282 /* "+=" is probably more fault tolerant than "=" */
283 priv->rdtodo += size;
284
285 dev_dbg(dev, "%s - rdtodo: %d\n", __func__, priv->rdtodo);
286
287 spin_unlock_irqrestore(&priv->lock, flags);
288
289 if (!old_rdtodo) {
290 result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
291 if (result)
292 dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
293 __func__, result);
294 dev_dbg(dev, "%s - usb_submit_urb(read urb)\n", __func__);
295 }
296 }
297
298resubmit:
299 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
300 if (result)
301 dev_err(&port->dev, "usb_submit_urb(read int) failed\n");
302 dev_dbg(dev, "%s - usb_submit_urb(int urb)\n", __func__);
303}
304
305static void cyberjack_read_bulk_callback(struct urb *urb)
306{
307 struct usb_serial_port *port = urb->context;
308 struct cyberjack_private *priv = usb_get_serial_port_data(port);
309 struct device *dev = &port->dev;
310 unsigned char *data = urb->transfer_buffer;
311 unsigned long flags;
312 short todo;
313 int result;
314 int status = urb->status;
315
316 usb_serial_debug_data(dev, __func__, urb->actual_length, data);
317 if (status) {
318 dev_dbg(dev, "%s - nonzero read bulk status received: %d\n",
319 __func__, status);
320 return;
321 }
322
323 if (urb->actual_length) {
324 tty_insert_flip_string(&port->port, data, urb->actual_length);
325 tty_flip_buffer_push(&port->port);
326 }
327
328 spin_lock_irqsave(&priv->lock, flags);
329
330 /* Reduce urbs to do by one. */
331 priv->rdtodo -= urb->actual_length;
332 /* Just to be sure */
333 if (priv->rdtodo < 0)
334 priv->rdtodo = 0;
335 todo = priv->rdtodo;
336
337 spin_unlock_irqrestore(&priv->lock, flags);
338
339 dev_dbg(dev, "%s - rdtodo: %d\n", __func__, todo);
340
341 /* Continue to read if we have still urbs to do. */
342 if (todo /* || (urb->actual_length==port->bulk_in_endpointAddress)*/) {
343 result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
344 if (result)
345 dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
346 __func__, result);
347 dev_dbg(dev, "%s - usb_submit_urb(read urb)\n", __func__);
348 }
349}
350
351static void cyberjack_write_bulk_callback(struct urb *urb)
352{
353 struct usb_serial_port *port = urb->context;
354 struct cyberjack_private *priv = usb_get_serial_port_data(port);
355 struct device *dev = &port->dev;
356 int status = urb->status;
357 unsigned long flags;
358 bool resubmitted = false;
359
360 if (status) {
361 dev_dbg(dev, "%s - nonzero write bulk status received: %d\n",
362 __func__, status);
363 set_bit(0, &port->write_urbs_free);
364 return;
365 }
366
367 spin_lock_irqsave(&priv->lock, flags);
368
369 /* only do something if we have more data to send */
370 if (priv->wrfilled) {
371 int length, blksize, result;
372
373 dev_dbg(dev, "%s - transmitting data (frame n)\n", __func__);
374
375 length = ((priv->wrfilled - priv->wrsent) > port->bulk_out_size) ?
376 port->bulk_out_size : (priv->wrfilled - priv->wrsent);
377
378 memcpy(port->write_urb->transfer_buffer,
379 priv->wrbuf + priv->wrsent, length);
380 priv->wrsent += length;
381
382 /* set up our urb */
383 port->write_urb->transfer_buffer_length = length;
384
385 /* send the data out the bulk port */
386 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
387 if (result) {
388 dev_err(dev, "%s - failed submitting write urb, error %d\n",
389 __func__, result);
390 /* Throw away data. No better idea what to do with it. */
391 priv->wrfilled = 0;
392 priv->wrsent = 0;
393 goto exit;
394 }
395
396 resubmitted = true;
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
412exit:
413 spin_unlock_irqrestore(&priv->lock, flags);
414 if (!resubmitted)
415 set_bit(0, &port->write_urbs_free);
416 usb_serial_port_softint(port);
417}
418
419module_usb_serial_driver(serial_drivers, id_table);
420
421MODULE_AUTHOR(DRIVER_AUTHOR);
422MODULE_DESCRIPTION(DRIVER_DESC);
423MODULE_LICENSE("GPL");
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 */
53static int cyberjack_port_probe(struct usb_serial_port *port);
54static int cyberjack_port_remove(struct usb_serial_port *port);
55static int cyberjack_open(struct tty_struct *tty,
56 struct usb_serial_port *port);
57static void cyberjack_close(struct usb_serial_port *port);
58static int cyberjack_write(struct tty_struct *tty,
59 struct usb_serial_port *port, const unsigned char *buf, int count);
60static int cyberjack_write_room(struct tty_struct *tty);
61static void cyberjack_read_int_callback(struct urb *urb);
62static void cyberjack_read_bulk_callback(struct urb *urb);
63static void cyberjack_write_bulk_callback(struct urb *urb);
64
65static const struct usb_device_id id_table[] = {
66 { USB_DEVICE(CYBERJACK_VENDOR_ID, CYBERJACK_PRODUCT_ID) },
67 { } /* Terminating entry */
68};
69
70MODULE_DEVICE_TABLE(usb, id_table);
71
72static 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
91static struct usb_serial_driver * const serial_drivers[] = {
92 &cyberjack_device, NULL
93};
94
95struct 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
103static 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
126static 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
138static int cyberjack_open(struct tty_struct *tty,
139 struct usb_serial_port *port)
140{
141 struct cyberjack_private *priv;
142 unsigned long flags;
143
144 dev_dbg(&port->dev, "%s - usb_clear_halt\n", __func__);
145 usb_clear_halt(port->serial->dev, port->write_urb->pipe);
146
147 priv = usb_get_serial_port_data(port);
148 spin_lock_irqsave(&priv->lock, flags);
149 priv->rdtodo = 0;
150 priv->wrfilled = 0;
151 priv->wrsent = 0;
152 spin_unlock_irqrestore(&priv->lock, flags);
153
154 return 0;
155}
156
157static void cyberjack_close(struct usb_serial_port *port)
158{
159 usb_kill_urb(port->write_urb);
160 usb_kill_urb(port->read_urb);
161}
162
163static int cyberjack_write(struct tty_struct *tty,
164 struct usb_serial_port *port, const unsigned char *buf, int count)
165{
166 struct device *dev = &port->dev;
167 struct cyberjack_private *priv = usb_get_serial_port_data(port);
168 unsigned long flags;
169 int result;
170 int wrexpected;
171
172 if (count == 0) {
173 dev_dbg(dev, "%s - write request of 0 bytes\n", __func__);
174 return 0;
175 }
176
177 if (!test_and_clear_bit(0, &port->write_urbs_free)) {
178 dev_dbg(dev, "%s - already writing\n", __func__);
179 return 0;
180 }
181
182 spin_lock_irqsave(&priv->lock, flags);
183
184 if (count+priv->wrfilled > sizeof(priv->wrbuf)) {
185 /* To much data for buffer. Reset buffer. */
186 priv->wrfilled = 0;
187 spin_unlock_irqrestore(&priv->lock, flags);
188 set_bit(0, &port->write_urbs_free);
189 return 0;
190 }
191
192 /* Copy data */
193 memcpy(priv->wrbuf + priv->wrfilled, buf, count);
194
195 usb_serial_debug_data(dev, __func__, count, priv->wrbuf + priv->wrfilled);
196 priv->wrfilled += count;
197
198 if (priv->wrfilled >= 3) {
199 wrexpected = ((int)priv->wrbuf[2]<<8)+priv->wrbuf[1]+3;
200 dev_dbg(dev, "%s - expected data: %d\n", __func__, wrexpected);
201 } else
202 wrexpected = sizeof(priv->wrbuf);
203
204 if (priv->wrfilled >= wrexpected) {
205 /* We have enough data to begin transmission */
206 int length;
207
208 dev_dbg(dev, "%s - transmitting data (frame 1)\n", __func__);
209 length = (wrexpected > port->bulk_out_size) ?
210 port->bulk_out_size : wrexpected;
211
212 memcpy(port->write_urb->transfer_buffer, priv->wrbuf, length);
213 priv->wrsent = length;
214
215 /* set up our urb */
216 port->write_urb->transfer_buffer_length = length;
217
218 /* send the data out the bulk port */
219 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
220 if (result) {
221 dev_err(&port->dev,
222 "%s - failed submitting write urb, error %d\n",
223 __func__, result);
224 /* Throw away data. No better idea what to do with it. */
225 priv->wrfilled = 0;
226 priv->wrsent = 0;
227 spin_unlock_irqrestore(&priv->lock, flags);
228 set_bit(0, &port->write_urbs_free);
229 return 0;
230 }
231
232 dev_dbg(dev, "%s - priv->wrsent=%d\n", __func__, priv->wrsent);
233 dev_dbg(dev, "%s - priv->wrfilled=%d\n", __func__, priv->wrfilled);
234
235 if (priv->wrsent >= priv->wrfilled) {
236 dev_dbg(dev, "%s - buffer cleaned\n", __func__);
237 memset(priv->wrbuf, 0, sizeof(priv->wrbuf));
238 priv->wrfilled = 0;
239 priv->wrsent = 0;
240 }
241 }
242
243 spin_unlock_irqrestore(&priv->lock, flags);
244
245 return count;
246}
247
248static int cyberjack_write_room(struct tty_struct *tty)
249{
250 /* FIXME: .... */
251 return CYBERJACK_LOCAL_BUF_SIZE;
252}
253
254static void cyberjack_read_int_callback(struct urb *urb)
255{
256 struct usb_serial_port *port = urb->context;
257 struct cyberjack_private *priv = usb_get_serial_port_data(port);
258 struct device *dev = &port->dev;
259 unsigned char *data = urb->transfer_buffer;
260 int status = urb->status;
261 int result;
262
263 /* the urb might have been killed. */
264 if (status)
265 return;
266
267 usb_serial_debug_data(dev, __func__, urb->actual_length, data);
268
269 /* React only to interrupts signaling a bulk_in transfer */
270 if (urb->actual_length == 4 && data[0] == 0x01) {
271 short old_rdtodo;
272
273 /* This is a announcement of coming bulk_ins. */
274 unsigned short size = ((unsigned short)data[3]<<8)+data[2]+3;
275
276 spin_lock(&priv->lock);
277
278 old_rdtodo = priv->rdtodo;
279
280 if (old_rdtodo > SHRT_MAX - size) {
281 dev_dbg(dev, "To many bulk_in urbs to do.\n");
282 spin_unlock(&priv->lock);
283 goto resubmit;
284 }
285
286 /* "+=" is probably more fault tolerant than "=" */
287 priv->rdtodo += size;
288
289 dev_dbg(dev, "%s - rdtodo: %d\n", __func__, priv->rdtodo);
290
291 spin_unlock(&priv->lock);
292
293 if (!old_rdtodo) {
294 result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
295 if (result)
296 dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
297 __func__, result);
298 dev_dbg(dev, "%s - usb_submit_urb(read urb)\n", __func__);
299 }
300 }
301
302resubmit:
303 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
304 if (result)
305 dev_err(&port->dev, "usb_submit_urb(read int) failed\n");
306 dev_dbg(dev, "%s - usb_submit_urb(int urb)\n", __func__);
307}
308
309static void cyberjack_read_bulk_callback(struct urb *urb)
310{
311 struct usb_serial_port *port = urb->context;
312 struct cyberjack_private *priv = usb_get_serial_port_data(port);
313 struct device *dev = &port->dev;
314 unsigned char *data = urb->transfer_buffer;
315 short todo;
316 int result;
317 int status = urb->status;
318
319 usb_serial_debug_data(dev, __func__, urb->actual_length, data);
320 if (status) {
321 dev_dbg(dev, "%s - nonzero read bulk status received: %d\n",
322 __func__, status);
323 return;
324 }
325
326 if (urb->actual_length) {
327 tty_insert_flip_string(&port->port, data, urb->actual_length);
328 tty_flip_buffer_push(&port->port);
329 }
330
331 spin_lock(&priv->lock);
332
333 /* Reduce urbs to do by one. */
334 priv->rdtodo -= urb->actual_length;
335 /* Just to be sure */
336 if (priv->rdtodo < 0)
337 priv->rdtodo = 0;
338 todo = priv->rdtodo;
339
340 spin_unlock(&priv->lock);
341
342 dev_dbg(dev, "%s - rdtodo: %d\n", __func__, todo);
343
344 /* Continue to read if we have still urbs to do. */
345 if (todo /* || (urb->actual_length==port->bulk_in_endpointAddress)*/) {
346 result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
347 if (result)
348 dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
349 __func__, result);
350 dev_dbg(dev, "%s - usb_submit_urb(read urb)\n", __func__);
351 }
352}
353
354static void cyberjack_write_bulk_callback(struct urb *urb)
355{
356 struct usb_serial_port *port = urb->context;
357 struct cyberjack_private *priv = usb_get_serial_port_data(port);
358 struct device *dev = &port->dev;
359 int status = urb->status;
360
361 set_bit(0, &port->write_urbs_free);
362 if (status) {
363 dev_dbg(dev, "%s - nonzero write bulk status received: %d\n",
364 __func__, status);
365 return;
366 }
367
368 spin_lock(&priv->lock);
369
370 /* only do something if we have more data to send */
371 if (priv->wrfilled) {
372 int length, blksize, result;
373
374 dev_dbg(dev, "%s - transmitting data (frame n)\n", __func__);
375
376 length = ((priv->wrfilled - priv->wrsent) > port->bulk_out_size) ?
377 port->bulk_out_size : (priv->wrfilled - priv->wrsent);
378
379 memcpy(port->write_urb->transfer_buffer,
380 priv->wrbuf + priv->wrsent, length);
381 priv->wrsent += length;
382
383 /* set up our urb */
384 port->write_urb->transfer_buffer_length = length;
385
386 /* send the data out the bulk port */
387 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
388 if (result) {
389 dev_err(dev, "%s - failed submitting write urb, error %d\n",
390 __func__, result);
391 /* Throw away data. No better idea what to do with it. */
392 priv->wrfilled = 0;
393 priv->wrsent = 0;
394 goto exit;
395 }
396
397 dev_dbg(dev, "%s - priv->wrsent=%d\n", __func__, priv->wrsent);
398 dev_dbg(dev, "%s - priv->wrfilled=%d\n", __func__, priv->wrfilled);
399
400 blksize = ((int)priv->wrbuf[2]<<8)+priv->wrbuf[1]+3;
401
402 if (priv->wrsent >= priv->wrfilled ||
403 priv->wrsent >= blksize) {
404 dev_dbg(dev, "%s - buffer cleaned\n", __func__);
405 memset(priv->wrbuf, 0, sizeof(priv->wrbuf));
406 priv->wrfilled = 0;
407 priv->wrsent = 0;
408 }
409 }
410
411exit:
412 spin_unlock(&priv->lock);
413 usb_serial_port_softint(port);
414}
415
416module_usb_serial_driver(serial_drivers, id_table);
417
418MODULE_AUTHOR(DRIVER_AUTHOR);
419MODULE_DESCRIPTION(DRIVER_DESC);
420MODULE_LICENSE("GPL");