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Linux 4.14.51
[linux/fpc-iii.git] / drivers / usb / misc / adutux.c
blob1c0ada75c35d7f61f1a21945abe12c4915a17c0f
1 /*
2 * adutux - driver for ADU devices from Ontrak Control Systems
3 * This is an experimental driver. Use at your own risk.
4 * This driver is not supported by Ontrak Control Systems.
5 *
6 * Copyright (c) 2003 John Homppi (SCO, leave this notice here)
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
12 *
13 * derived from the Lego USB Tower driver 0.56:
14 * Copyright (c) 2003 David Glance <davidgsf@sourceforge.net>
15 * 2001 Juergen Stuber <stuber@loria.fr>
16 * that was derived from USB Skeleton driver - 0.5
17 * Copyright (c) 2001 Greg Kroah-Hartman (greg@kroah.com)
18 *
19 */
20
21 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22
23 #include <linux/kernel.h>
24 #include <linux/sched/signal.h>
25 #include <linux/errno.h>
26 #include <linux/slab.h>
27 #include <linux/module.h>
28 #include <linux/usb.h>
29 #include <linux/mutex.h>
30 #include <linux/uaccess.h>
31
32 #define DRIVER_AUTHOR "John Homppi"
33 #define DRIVER_DESC "adutux (see www.ontrak.net)"
34
35 /* Define these values to match your device */
36 #define ADU_VENDOR_ID 0x0a07
37 #define ADU_PRODUCT_ID 0x0064
38
39 /* table of devices that work with this driver */
40 static const struct usb_device_id device_table[] = {
41 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID) }, /* ADU100 */
42 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+20) }, /* ADU120 */
43 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+30) }, /* ADU130 */
44 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+100) }, /* ADU200 */
45 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+108) }, /* ADU208 */
46 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+118) }, /* ADU218 */
47 { } /* Terminating entry */
48 };
49
50 MODULE_DEVICE_TABLE(usb, device_table);
51
52 #ifdef CONFIG_USB_DYNAMIC_MINORS
53 #define ADU_MINOR_BASE 0
54 #else
55 #define ADU_MINOR_BASE 67
56 #endif
57
58 /* we can have up to this number of device plugged in at once */
59 #define MAX_DEVICES 16
60
61 #define COMMAND_TIMEOUT (2*HZ) /* 60 second timeout for a command */
62
63 /*
64 * The locking scheme is a vanilla 3-lock:
65 * adu_device.buflock: A spinlock, covers what IRQs touch.
66 * adutux_mutex: A Static lock to cover open_count. It would also cover
67 * any globals, but we don't have them in 2.6.
68 * adu_device.mtx: A mutex to hold across sleepers like copy_from_user.
69 * It covers all of adu_device, except the open_count
70 * and what .buflock covers.
71 */
72
73 /* Structure to hold all of our device specific stuff */
74 struct adu_device {
75 struct mutex mtx;
76 struct usb_device *udev; /* save off the usb device pointer */
77 struct usb_interface *interface;
78 unsigned int minor; /* the starting minor number for this device */
79 char serial_number[8];
80
81 int open_count; /* number of times this port has been opened */
82
83 char *read_buffer_primary;
84 int read_buffer_length;
85 char *read_buffer_secondary;
86 int secondary_head;
87 int secondary_tail;
88 spinlock_t buflock;
89
90 wait_queue_head_t read_wait;
91 wait_queue_head_t write_wait;
92
93 char *interrupt_in_buffer;
94 struct usb_endpoint_descriptor *interrupt_in_endpoint;
95 struct urb *interrupt_in_urb;
96 int read_urb_finished;
97
98 char *interrupt_out_buffer;
99 struct usb_endpoint_descriptor *interrupt_out_endpoint;
100 struct urb *interrupt_out_urb;
101 int out_urb_finished;
102 };
103
104 static DEFINE_MUTEX(adutux_mutex);
105
106 static struct usb_driver adu_driver;
107
108 static inline void adu_debug_data(struct device *dev, const char *function,
109 int size, const unsigned char *data)
110 {
111 dev_dbg(dev, "%s - length = %d, data = %*ph\n",
112 function, size, size, data);
113 }
114
115 /**
116 * adu_abort_transfers
117 * aborts transfers and frees associated data structures
118 */
119 static void adu_abort_transfers(struct adu_device *dev)
120 {
121 unsigned long flags;
122
123 if (dev->udev == NULL)
124 return;
125
126 /* shutdown transfer */
127
128 /* XXX Anchor these instead */
129 spin_lock_irqsave(&dev->buflock, flags);
130 if (!dev->read_urb_finished) {
131 spin_unlock_irqrestore(&dev->buflock, flags);
132 usb_kill_urb(dev->interrupt_in_urb);
133 } else
134 spin_unlock_irqrestore(&dev->buflock, flags);
135
136 spin_lock_irqsave(&dev->buflock, flags);
137 if (!dev->out_urb_finished) {
138 spin_unlock_irqrestore(&dev->buflock, flags);
139 usb_kill_urb(dev->interrupt_out_urb);
140 } else
141 spin_unlock_irqrestore(&dev->buflock, flags);
142 }
143
144 static void adu_delete(struct adu_device *dev)
145 {
146 /* free data structures */
147 usb_free_urb(dev->interrupt_in_urb);
148 usb_free_urb(dev->interrupt_out_urb);
149 kfree(dev->read_buffer_primary);
150 kfree(dev->read_buffer_secondary);
151 kfree(dev->interrupt_in_buffer);
152 kfree(dev->interrupt_out_buffer);
153 kfree(dev);
154 }
155
156 static void adu_interrupt_in_callback(struct urb *urb)
157 {
158 struct adu_device *dev = urb->context;
159 int status = urb->status;
160
161 adu_debug_data(&dev->udev->dev, __func__,
162 urb->actual_length, urb->transfer_buffer);
163
164 spin_lock(&dev->buflock);
165
166 if (status != 0) {
167 if ((status != -ENOENT) && (status != -ECONNRESET) &&
168 (status != -ESHUTDOWN)) {
169 dev_dbg(&dev->udev->dev,
170 "%s : nonzero status received: %d\n",
171 __func__, status);
172 }
173 goto exit;
174 }
175
176 if (urb->actual_length > 0 && dev->interrupt_in_buffer[0] != 0x00) {
177 if (dev->read_buffer_length <
178 (4 * usb_endpoint_maxp(dev->interrupt_in_endpoint)) -
179 (urb->actual_length)) {
180 memcpy (dev->read_buffer_primary +
181 dev->read_buffer_length,
182 dev->interrupt_in_buffer, urb->actual_length);
183
184 dev->read_buffer_length += urb->actual_length;
185 dev_dbg(&dev->udev->dev,"%s reading %d\n", __func__,
186 urb->actual_length);
187 } else {
188 dev_dbg(&dev->udev->dev,"%s : read_buffer overflow\n",
189 __func__);
190 }
191 }
192
193 exit:
194 dev->read_urb_finished = 1;
195 spin_unlock(&dev->buflock);
196 /* always wake up so we recover from errors */
197 wake_up_interruptible(&dev->read_wait);
198 }
199
200 static void adu_interrupt_out_callback(struct urb *urb)
201 {
202 struct adu_device *dev = urb->context;
203 int status = urb->status;
204
205 adu_debug_data(&dev->udev->dev, __func__,
206 urb->actual_length, urb->transfer_buffer);
207
208 if (status != 0) {
209 if ((status != -ENOENT) &&
210 (status != -ECONNRESET)) {
211 dev_dbg(&dev->udev->dev,
212 "%s :nonzero status received: %d\n", __func__,
213 status);
214 }
215 return;
216 }
217
218 spin_lock(&dev->buflock);
219 dev->out_urb_finished = 1;
220 wake_up(&dev->write_wait);
221 spin_unlock(&dev->buflock);
222 }
223
224 static int adu_open(struct inode *inode, struct file *file)
225 {
226 struct adu_device *dev = NULL;
227 struct usb_interface *interface;
228 int subminor;
229 int retval;
230
231 subminor = iminor(inode);
232
233 retval = mutex_lock_interruptible(&adutux_mutex);
234 if (retval)
235 goto exit_no_lock;
236
237 interface = usb_find_interface(&adu_driver, subminor);
238 if (!interface) {
239 pr_err("%s - error, can't find device for minor %d\n",
240 __func__, subminor);
241 retval = -ENODEV;
242 goto exit_no_device;
243 }
244
245 dev = usb_get_intfdata(interface);
246 if (!dev || !dev->udev) {
247 retval = -ENODEV;
248 goto exit_no_device;
249 }
250
251 /* check that nobody else is using the device */
252 if (dev->open_count) {
253 retval = -EBUSY;
254 goto exit_no_device;
255 }
256
257 ++dev->open_count;
258 dev_dbg(&dev->udev->dev, "%s: open count %d\n", __func__,
259 dev->open_count);
260
261 /* save device in the file's private structure */
262 file->private_data = dev;
263
264 /* initialize in direction */
265 dev->read_buffer_length = 0;
266
267 /* fixup first read by having urb waiting for it */
268 usb_fill_int_urb(dev->interrupt_in_urb, dev->udev,
269 usb_rcvintpipe(dev->udev,
270 dev->interrupt_in_endpoint->bEndpointAddress),
271 dev->interrupt_in_buffer,
272 usb_endpoint_maxp(dev->interrupt_in_endpoint),
273 adu_interrupt_in_callback, dev,
274 dev->interrupt_in_endpoint->bInterval);
275 dev->read_urb_finished = 0;
276 if (usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL))
277 dev->read_urb_finished = 1;
278 /* we ignore failure */
279 /* end of fixup for first read */
280
281 /* initialize out direction */
282 dev->out_urb_finished = 1;
283
284 retval = 0;
285
286 exit_no_device:
287 mutex_unlock(&adutux_mutex);
288 exit_no_lock:
289 return retval;
290 }
291
292 static void adu_release_internal(struct adu_device *dev)
293 {
294 /* decrement our usage count for the device */
295 --dev->open_count;
296 dev_dbg(&dev->udev->dev, "%s : open count %d\n", __func__,
297 dev->open_count);
298 if (dev->open_count <= 0) {
299 adu_abort_transfers(dev);
300 dev->open_count = 0;
301 }
302 }
303
304 static int adu_release(struct inode *inode, struct file *file)
305 {
306 struct adu_device *dev;
307 int retval = 0;
308
309 if (file == NULL) {
310 retval = -ENODEV;
311 goto exit;
312 }
313
314 dev = file->private_data;
315 if (dev == NULL) {
316 retval = -ENODEV;
317 goto exit;
318 }
319
320 mutex_lock(&adutux_mutex); /* not interruptible */
321
322 if (dev->open_count <= 0) {
323 dev_dbg(&dev->udev->dev, "%s : device not opened\n", __func__);
324 retval = -ENODEV;
325 goto unlock;
326 }
327
328 adu_release_internal(dev);
329 if (dev->udev == NULL) {
330 /* the device was unplugged before the file was released */
331 if (!dev->open_count) /* ... and we're the last user */
332 adu_delete(dev);
333 }
334 unlock:
335 mutex_unlock(&adutux_mutex);
336 exit:
337 return retval;
338 }
339
340 static ssize_t adu_read(struct file *file, __user char *buffer, size_t count,
341 loff_t *ppos)
342 {
343 struct adu_device *dev;
344 size_t bytes_read = 0;
345 size_t bytes_to_read = count;
346 int i;
347 int retval = 0;
348 int timeout = 0;
349 int should_submit = 0;
350 unsigned long flags;
351 DECLARE_WAITQUEUE(wait, current);
352
353 dev = file->private_data;
354 if (mutex_lock_interruptible(&dev->mtx))
355 return -ERESTARTSYS;
356
357 /* verify that the device wasn't unplugged */
358 if (dev->udev == NULL) {
359 retval = -ENODEV;
360 pr_err("No device or device unplugged %d\n", retval);
361 goto exit;
362 }
363
364 /* verify that some data was requested */
365 if (count == 0) {
366 dev_dbg(&dev->udev->dev, "%s : read request of 0 bytes\n",
367 __func__);
368 goto exit;
369 }
370
371 timeout = COMMAND_TIMEOUT;
372 dev_dbg(&dev->udev->dev, "%s : about to start looping\n", __func__);
373 while (bytes_to_read) {
374 int data_in_secondary = dev->secondary_tail - dev->secondary_head;
375 dev_dbg(&dev->udev->dev,
376 "%s : while, data_in_secondary=%d, status=%d\n",
377 __func__, data_in_secondary,
378 dev->interrupt_in_urb->status);
379
380 if (data_in_secondary) {
381 /* drain secondary buffer */
382 int amount = bytes_to_read < data_in_secondary ? bytes_to_read : data_in_secondary;
383 i = copy_to_user(buffer, dev->read_buffer_secondary+dev->secondary_head, amount);
384 if (i) {
385 retval = -EFAULT;
386 goto exit;
387 }
388 dev->secondary_head += (amount - i);
389 bytes_read += (amount - i);
390 bytes_to_read -= (amount - i);
391 } else {
392 /* we check the primary buffer */
393 spin_lock_irqsave (&dev->buflock, flags);
394 if (dev->read_buffer_length) {
395 /* we secure access to the primary */
396 char *tmp;
397 dev_dbg(&dev->udev->dev,
398 "%s : swap, read_buffer_length = %d\n",
399 __func__, dev->read_buffer_length);
400 tmp = dev->read_buffer_secondary;
401 dev->read_buffer_secondary = dev->read_buffer_primary;
402 dev->read_buffer_primary = tmp;
403 dev->secondary_head = 0;
404 dev->secondary_tail = dev->read_buffer_length;
405 dev->read_buffer_length = 0;
406 spin_unlock_irqrestore(&dev->buflock, flags);
407 /* we have a free buffer so use it */
408 should_submit = 1;
409 } else {
410 /* even the primary was empty - we may need to do IO */
411 if (!dev->read_urb_finished) {
412 /* somebody is doing IO */
413 spin_unlock_irqrestore(&dev->buflock, flags);
414 dev_dbg(&dev->udev->dev,
415 "%s : submitted already\n",
416 __func__);
417 } else {
418 /* we must initiate input */
419 dev_dbg(&dev->udev->dev,
420 "%s : initiate input\n",
421 __func__);
422 dev->read_urb_finished = 0;
423 spin_unlock_irqrestore(&dev->buflock, flags);
424
425 usb_fill_int_urb(dev->interrupt_in_urb, dev->udev,
426 usb_rcvintpipe(dev->udev,
427 dev->interrupt_in_endpoint->bEndpointAddress),
428 dev->interrupt_in_buffer,
429 usb_endpoint_maxp(dev->interrupt_in_endpoint),
430 adu_interrupt_in_callback,
431 dev,
432 dev->interrupt_in_endpoint->bInterval);
433 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
434 if (retval) {
435 dev->read_urb_finished = 1;
436 if (retval == -ENOMEM) {
437 retval = bytes_read ? bytes_read : -ENOMEM;
438 }
439 dev_dbg(&dev->udev->dev,
440 "%s : submit failed\n",
441 __func__);
442 goto exit;
443 }
444 }
445
446 /* we wait for I/O to complete */
447 set_current_state(TASK_INTERRUPTIBLE);
448 add_wait_queue(&dev->read_wait, &wait);
449 spin_lock_irqsave(&dev->buflock, flags);
450 if (!dev->read_urb_finished) {
451 spin_unlock_irqrestore(&dev->buflock, flags);
452 timeout = schedule_timeout(COMMAND_TIMEOUT);
453 } else {
454 spin_unlock_irqrestore(&dev->buflock, flags);
455 set_current_state(TASK_RUNNING);
456 }
457 remove_wait_queue(&dev->read_wait, &wait);
458
459 if (timeout <= 0) {
460 dev_dbg(&dev->udev->dev,
461 "%s : timeout\n", __func__);
462 retval = bytes_read ? bytes_read : -ETIMEDOUT;
463 goto exit;
464 }
465
466 if (signal_pending(current)) {
467 dev_dbg(&dev->udev->dev,
468 "%s : signal pending\n",
469 __func__);
470 retval = bytes_read ? bytes_read : -EINTR;
471 goto exit;
472 }
473 }
474 }
475 }
476
477 retval = bytes_read;
478 /* if the primary buffer is empty then use it */
479 spin_lock_irqsave(&dev->buflock, flags);
480 if (should_submit && dev->read_urb_finished) {
481 dev->read_urb_finished = 0;
482 spin_unlock_irqrestore(&dev->buflock, flags);
483 usb_fill_int_urb(dev->interrupt_in_urb, dev->udev,
484 usb_rcvintpipe(dev->udev,
485 dev->interrupt_in_endpoint->bEndpointAddress),
486 dev->interrupt_in_buffer,
487 usb_endpoint_maxp(dev->interrupt_in_endpoint),
488 adu_interrupt_in_callback,
489 dev,
490 dev->interrupt_in_endpoint->bInterval);
491 if (usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL) != 0)
492 dev->read_urb_finished = 1;
493 /* we ignore failure */
494 } else {
495 spin_unlock_irqrestore(&dev->buflock, flags);
496 }
497
498 exit:
499 /* unlock the device */
500 mutex_unlock(&dev->mtx);
501
502 return retval;
503 }
504
505 static ssize_t adu_write(struct file *file, const __user char *buffer,
506 size_t count, loff_t *ppos)
507 {
508 DECLARE_WAITQUEUE(waita, current);
509 struct adu_device *dev;
510 size_t bytes_written = 0;
511 size_t bytes_to_write;
512 size_t buffer_size;
513 unsigned long flags;
514 int retval;
515
516 dev = file->private_data;
517
518 retval = mutex_lock_interruptible(&dev->mtx);
519 if (retval)
520 goto exit_nolock;
521
522 /* verify that the device wasn't unplugged */
523 if (dev->udev == NULL) {
524 retval = -ENODEV;
525 pr_err("No device or device unplugged %d\n", retval);
526 goto exit;
527 }
528
529 /* verify that we actually have some data to write */
530 if (count == 0) {
531 dev_dbg(&dev->udev->dev, "%s : write request of 0 bytes\n",
532 __func__);
533 goto exit;
534 }
535
536 while (count > 0) {
537 add_wait_queue(&dev->write_wait, &waita);
538 set_current_state(TASK_INTERRUPTIBLE);
539 spin_lock_irqsave(&dev->buflock, flags);
540 if (!dev->out_urb_finished) {
541 spin_unlock_irqrestore(&dev->buflock, flags);
542
543 mutex_unlock(&dev->mtx);
544 if (signal_pending(current)) {
545 dev_dbg(&dev->udev->dev, "%s : interrupted\n",
546 __func__);
547 set_current_state(TASK_RUNNING);
548 retval = -EINTR;
549 goto exit_onqueue;
550 }
551 if (schedule_timeout(COMMAND_TIMEOUT) == 0) {
552 dev_dbg(&dev->udev->dev,
553 "%s - command timed out.\n", __func__);
554 retval = -ETIMEDOUT;
555 goto exit_onqueue;
556 }
557 remove_wait_queue(&dev->write_wait, &waita);
558 retval = mutex_lock_interruptible(&dev->mtx);
559 if (retval) {
560 retval = bytes_written ? bytes_written : retval;
561 goto exit_nolock;
562 }
563
564 dev_dbg(&dev->udev->dev,
565 "%s : in progress, count = %zd\n",
566 __func__, count);
567 } else {
568 spin_unlock_irqrestore(&dev->buflock, flags);
569 set_current_state(TASK_RUNNING);
570 remove_wait_queue(&dev->write_wait, &waita);
571 dev_dbg(&dev->udev->dev, "%s : sending, count = %zd\n",
572 __func__, count);
573
574 /* write the data into interrupt_out_buffer from userspace */
575 buffer_size = usb_endpoint_maxp(dev->interrupt_out_endpoint);
576 bytes_to_write = count > buffer_size ? buffer_size : count;
577 dev_dbg(&dev->udev->dev,
578 "%s : buffer_size = %zd, count = %zd, bytes_to_write = %zd\n",
579 __func__, buffer_size, count, bytes_to_write);
580
581 if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write) != 0) {
582 retval = -EFAULT;
583 goto exit;
584 }
585
586 /* send off the urb */
587 usb_fill_int_urb(
588 dev->interrupt_out_urb,
589 dev->udev,
590 usb_sndintpipe(dev->udev, dev->interrupt_out_endpoint->bEndpointAddress),
591 dev->interrupt_out_buffer,
592 bytes_to_write,
593 adu_interrupt_out_callback,
594 dev,
595 dev->interrupt_out_endpoint->bInterval);
596 dev->interrupt_out_urb->actual_length = bytes_to_write;
597 dev->out_urb_finished = 0;
598 retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL);
599 if (retval < 0) {
600 dev->out_urb_finished = 1;
601 dev_err(&dev->udev->dev, "Couldn't submit "
602 "interrupt_out_urb %d\n", retval);
603 goto exit;
604 }
605
606 buffer += bytes_to_write;
607 count -= bytes_to_write;
608
609 bytes_written += bytes_to_write;
610 }
611 }
612 mutex_unlock(&dev->mtx);
613 return bytes_written;
614
615 exit:
616 mutex_unlock(&dev->mtx);
617 exit_nolock:
618 return retval;
619
620 exit_onqueue:
621 remove_wait_queue(&dev->write_wait, &waita);
622 return retval;
623 }
624
625 /* file operations needed when we register this driver */
626 static const struct file_operations adu_fops = {
627 .owner = THIS_MODULE,
628 .read = adu_read,
629 .write = adu_write,
630 .open = adu_open,
631 .release = adu_release,
632 .llseek = noop_llseek,
633 };
634
635 /*
636 * usb class driver info in order to get a minor number from the usb core,
637 * and to have the device registered with devfs and the driver core
638 */
639 static struct usb_class_driver adu_class = {
640 .name = "usb/adutux%d",
641 .fops = &adu_fops,
642 .minor_base = ADU_MINOR_BASE,
643 };
644
645 /**
646 * adu_probe
647 *
648 * Called by the usb core when a new device is connected that it thinks
649 * this driver might be interested in.
650 */
651 static int adu_probe(struct usb_interface *interface,
652 const struct usb_device_id *id)
653 {
654 struct usb_device *udev = interface_to_usbdev(interface);
655 struct adu_device *dev = NULL;
656 int retval = -ENOMEM;
657 int in_end_size;
658 int out_end_size;
659 int res;
660
661 /* allocate memory for our device state and initialize it */
662 dev = kzalloc(sizeof(struct adu_device), GFP_KERNEL);
663 if (!dev)
664 return -ENOMEM;
665
666 mutex_init(&dev->mtx);
667 spin_lock_init(&dev->buflock);
668 dev->udev = udev;
669 init_waitqueue_head(&dev->read_wait);
670 init_waitqueue_head(&dev->write_wait);
671
672 res = usb_find_common_endpoints_reverse(&interface->altsetting[0],
673 NULL, NULL,
674 &dev->interrupt_in_endpoint,
675 &dev->interrupt_out_endpoint);
676 if (res) {
677 dev_err(&interface->dev, "interrupt endpoints not found\n");
678 retval = res;
679 goto error;
680 }
681
682 in_end_size = usb_endpoint_maxp(dev->interrupt_in_endpoint);
683 out_end_size = usb_endpoint_maxp(dev->interrupt_out_endpoint);
684
685 dev->read_buffer_primary = kmalloc((4 * in_end_size), GFP_KERNEL);
686 if (!dev->read_buffer_primary)
687 goto error;
688
689 /* debug code prime the buffer */
690 memset(dev->read_buffer_primary, 'a', in_end_size);
691 memset(dev->read_buffer_primary + in_end_size, 'b', in_end_size);
692 memset(dev->read_buffer_primary + (2 * in_end_size), 'c', in_end_size);
693 memset(dev->read_buffer_primary + (3 * in_end_size), 'd', in_end_size);
694
695 dev->read_buffer_secondary = kmalloc((4 * in_end_size), GFP_KERNEL);
696 if (!dev->read_buffer_secondary)
697 goto error;
698
699 /* debug code prime the buffer */
700 memset(dev->read_buffer_secondary, 'e', in_end_size);
701 memset(dev->read_buffer_secondary + in_end_size, 'f', in_end_size);
702 memset(dev->read_buffer_secondary + (2 * in_end_size), 'g', in_end_size);
703 memset(dev->read_buffer_secondary + (3 * in_end_size), 'h', in_end_size);
704
705 dev->interrupt_in_buffer = kmalloc(in_end_size, GFP_KERNEL);
706 if (!dev->interrupt_in_buffer)
707 goto error;
708
709 /* debug code prime the buffer */
710 memset(dev->interrupt_in_buffer, 'i', in_end_size);
711
712 dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
713 if (!dev->interrupt_in_urb)
714 goto error;
715 dev->interrupt_out_buffer = kmalloc(out_end_size, GFP_KERNEL);
716 if (!dev->interrupt_out_buffer)
717 goto error;
718 dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
719 if (!dev->interrupt_out_urb)
720 goto error;
721
722 if (!usb_string(udev, udev->descriptor.iSerialNumber, dev->serial_number,
723 sizeof(dev->serial_number))) {
724 dev_err(&interface->dev, "Could not retrieve serial number\n");
725 retval = -EIO;
726 goto error;
727 }
728 dev_dbg(&interface->dev,"serial_number=%s", dev->serial_number);
729
730 /* we can register the device now, as it is ready */
731 usb_set_intfdata(interface, dev);
732
733 retval = usb_register_dev(interface, &adu_class);
734
735 if (retval) {
736 /* something prevented us from registering this driver */
737 dev_err(&interface->dev, "Not able to get a minor for this device.\n");
738 usb_set_intfdata(interface, NULL);
739 goto error;
740 }
741
742 dev->minor = interface->minor;
743
744 /* let the user know what node this device is now attached to */
745 dev_info(&interface->dev, "ADU%d %s now attached to /dev/usb/adutux%d\n",
746 le16_to_cpu(udev->descriptor.idProduct), dev->serial_number,
747 (dev->minor - ADU_MINOR_BASE));
748
749 return 0;
750
751 error:
752 adu_delete(dev);
753 return retval;
754 }
755
756 /**
757 * adu_disconnect
758 *
759 * Called by the usb core when the device is removed from the system.
760 */
761 static void adu_disconnect(struct usb_interface *interface)
762 {
763 struct adu_device *dev;
764 int minor;
765
766 dev = usb_get_intfdata(interface);
767
768 mutex_lock(&dev->mtx); /* not interruptible */
769 dev->udev = NULL; /* poison */
770 minor = dev->minor;
771 usb_deregister_dev(interface, &adu_class);
772 mutex_unlock(&dev->mtx);
773
774 mutex_lock(&adutux_mutex);
775 usb_set_intfdata(interface, NULL);
776
777 /* if the device is not opened, then we clean up right now */
778 if (!dev->open_count)
779 adu_delete(dev);
780
781 mutex_unlock(&adutux_mutex);
782 }
783
784 /* usb specific object needed to register this driver with the usb subsystem */
785 static struct usb_driver adu_driver = {
786 .name = "adutux",
787 .probe = adu_probe,
788 .disconnect = adu_disconnect,
789 .id_table = device_table,
790 };
791
792 module_usb_driver(adu_driver);
793
794 MODULE_AUTHOR(DRIVER_AUTHOR);
795 MODULE_DESCRIPTION(DRIVER_DESC);
796 MODULE_LICENSE("GPL");
Linux with added FPC-III support