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 unsigned long disconnected:1;
83
84 char *read_buffer_primary;
85 int read_buffer_length;
86 char *read_buffer_secondary;
87 int secondary_head;
88 int secondary_tail;
89 spinlock_t buflock;
90
91 wait_queue_head_t read_wait;
92 wait_queue_head_t write_wait;
93
94 char *interrupt_in_buffer;
95 struct usb_endpoint_descriptor *interrupt_in_endpoint;
96 struct urb *interrupt_in_urb;
97 int read_urb_finished;
98
99 char *interrupt_out_buffer;
100 struct usb_endpoint_descriptor *interrupt_out_endpoint;
101 struct urb *interrupt_out_urb;
102 int out_urb_finished;
103 };
104
105 static DEFINE_MUTEX(adutux_mutex);
106
107 static struct usb_driver adu_driver;
108
adu_debug_data(struct device * dev,const char * function,int size,const unsigned char * data)109 static inline void adu_debug_data(struct device *dev, const char *function,
110 int size, const unsigned char *data)
111 {
112 dev_dbg(dev, "%s - length = %d, data = %*ph\n",
113 function, size, size, data);
114 }
115
116 /**
117 * adu_abort_transfers
118 * aborts transfers and frees associated data structures
119 */
adu_abort_transfers(struct adu_device * dev)120 static void adu_abort_transfers(struct adu_device *dev)
121 {
122 unsigned long flags;
123
124 if (dev->disconnected)
125 return;
126
127 /* shutdown transfer */
128
129 /* XXX Anchor these instead */
130 spin_lock_irqsave(&dev->buflock, flags);
131 if (!dev->read_urb_finished) {
132 spin_unlock_irqrestore(&dev->buflock, flags);
133 usb_kill_urb(dev->interrupt_in_urb);
134 } else
135 spin_unlock_irqrestore(&dev->buflock, flags);
136
137 spin_lock_irqsave(&dev->buflock, flags);
138 if (!dev->out_urb_finished) {
139 spin_unlock_irqrestore(&dev->buflock, flags);
140 usb_kill_urb(dev->interrupt_out_urb);
141 } else
142 spin_unlock_irqrestore(&dev->buflock, flags);
143 }
144
adu_delete(struct adu_device * dev)145 static void adu_delete(struct adu_device *dev)
146 {
147 /* free data structures */
148 usb_free_urb(dev->interrupt_in_urb);
149 usb_free_urb(dev->interrupt_out_urb);
150 kfree(dev->read_buffer_primary);
151 kfree(dev->read_buffer_secondary);
152 kfree(dev->interrupt_in_buffer);
153 kfree(dev->interrupt_out_buffer);
154 usb_put_dev(dev->udev);
155 kfree(dev);
156 }
157
adu_interrupt_in_callback(struct urb * urb)158 static void adu_interrupt_in_callback(struct urb *urb)
159 {
160 struct adu_device *dev = urb->context;
161 int status = urb->status;
162
163 adu_debug_data(&dev->udev->dev, __func__,
164 urb->actual_length, urb->transfer_buffer);
165
166 spin_lock(&dev->buflock);
167
168 if (status != 0) {
169 if ((status != -ENOENT) && (status != -ECONNRESET) &&
170 (status != -ESHUTDOWN)) {
171 dev_dbg(&dev->udev->dev,
172 "%s : nonzero status received: %d\n",
173 __func__, status);
174 }
175 goto exit;
176 }
177
178 if (urb->actual_length > 0 && dev->interrupt_in_buffer[0] != 0x00) {
179 if (dev->read_buffer_length <
180 (4 * usb_endpoint_maxp(dev->interrupt_in_endpoint)) -
181 (urb->actual_length)) {
182 memcpy (dev->read_buffer_primary +
183 dev->read_buffer_length,
184 dev->interrupt_in_buffer, urb->actual_length);
185
186 dev->read_buffer_length += urb->actual_length;
187 dev_dbg(&dev->udev->dev,"%s reading %d\n", __func__,
188 urb->actual_length);
189 } else {
190 dev_dbg(&dev->udev->dev,"%s : read_buffer overflow\n",
191 __func__);
192 }
193 }
194
195 exit:
196 dev->read_urb_finished = 1;
197 spin_unlock(&dev->buflock);
198 /* always wake up so we recover from errors */
199 wake_up_interruptible(&dev->read_wait);
200 }
201
adu_interrupt_out_callback(struct urb * urb)202 static void adu_interrupt_out_callback(struct urb *urb)
203 {
204 struct adu_device *dev = urb->context;
205 int status = urb->status;
206
207 adu_debug_data(&dev->udev->dev, __func__,
208 urb->actual_length, urb->transfer_buffer);
209
210 if (status != 0) {
211 if ((status != -ENOENT) &&
212 (status != -ECONNRESET)) {
213 dev_dbg(&dev->udev->dev,
214 "%s :nonzero status received: %d\n", __func__,
215 status);
216 }
217 return;
218 }
219
220 spin_lock(&dev->buflock);
221 dev->out_urb_finished = 1;
222 wake_up(&dev->write_wait);
223 spin_unlock(&dev->buflock);
224 }
225
adu_open(struct inode * inode,struct file * file)226 static int adu_open(struct inode *inode, struct file *file)
227 {
228 struct adu_device *dev = NULL;
229 struct usb_interface *interface;
230 int subminor;
231 int retval;
232
233 subminor = iminor(inode);
234
235 retval = mutex_lock_interruptible(&adutux_mutex);
236 if (retval)
237 goto exit_no_lock;
238
239 interface = usb_find_interface(&adu_driver, subminor);
240 if (!interface) {
241 pr_err("%s - error, can't find device for minor %d\n",
242 __func__, subminor);
243 retval = -ENODEV;
244 goto exit_no_device;
245 }
246
247 dev = usb_get_intfdata(interface);
248 if (!dev) {
249 retval = -ENODEV;
250 goto exit_no_device;
251 }
252
253 /* check that nobody else is using the device */
254 if (dev->open_count) {
255 retval = -EBUSY;
256 goto exit_no_device;
257 }
258
259 ++dev->open_count;
260 dev_dbg(&dev->udev->dev, "%s: open count %d\n", __func__,
261 dev->open_count);
262
263 /* save device in the file's private structure */
264 file->private_data = dev;
265
266 /* initialize in direction */
267 dev->read_buffer_length = 0;
268
269 /* fixup first read by having urb waiting for it */
270 usb_fill_int_urb(dev->interrupt_in_urb, dev->udev,
271 usb_rcvintpipe(dev->udev,
272 dev->interrupt_in_endpoint->bEndpointAddress),
273 dev->interrupt_in_buffer,
274 usb_endpoint_maxp(dev->interrupt_in_endpoint),
275 adu_interrupt_in_callback, dev,
276 dev->interrupt_in_endpoint->bInterval);
277 dev->read_urb_finished = 0;
278 if (usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL))
279 dev->read_urb_finished = 1;
280 /* we ignore failure */
281 /* end of fixup for first read */
282
283 /* initialize out direction */
284 dev->out_urb_finished = 1;
285
286 retval = 0;
287
288 exit_no_device:
289 mutex_unlock(&adutux_mutex);
290 exit_no_lock:
291 return retval;
292 }
293
adu_release_internal(struct adu_device * dev)294 static void adu_release_internal(struct adu_device *dev)
295 {
296 /* decrement our usage count for the device */
297 --dev->open_count;
298 dev_dbg(&dev->udev->dev, "%s : open count %d\n", __func__,
299 dev->open_count);
300 if (dev->open_count <= 0) {
301 adu_abort_transfers(dev);
302 dev->open_count = 0;
303 }
304 }
305
adu_release(struct inode * inode,struct file * file)306 static int adu_release(struct inode *inode, struct file *file)
307 {
308 struct adu_device *dev;
309 int retval = 0;
310
311 if (file == NULL) {
312 retval = -ENODEV;
313 goto exit;
314 }
315
316 dev = file->private_data;
317 if (dev == NULL) {
318 retval = -ENODEV;
319 goto exit;
320 }
321
322 mutex_lock(&adutux_mutex); /* not interruptible */
323
324 if (dev->open_count <= 0) {
325 dev_dbg(&dev->udev->dev, "%s : device not opened\n", __func__);
326 retval = -ENODEV;
327 goto unlock;
328 }
329
330 adu_release_internal(dev);
331 if (dev->disconnected) {
332 /* the device was unplugged before the file was released */
333 if (!dev->open_count) /* ... and we're the last user */
334 adu_delete(dev);
335 }
336 unlock:
337 mutex_unlock(&adutux_mutex);
338 exit:
339 return retval;
340 }
341
adu_read(struct file * file,__user char * buffer,size_t count,loff_t * ppos)342 static ssize_t adu_read(struct file *file, __user char *buffer, size_t count,
343 loff_t *ppos)
344 {
345 struct adu_device *dev;
346 size_t bytes_read = 0;
347 size_t bytes_to_read = count;
348 int i;
349 int retval = 0;
350 int timeout = 0;
351 int should_submit = 0;
352 unsigned long flags;
353 DECLARE_WAITQUEUE(wait, current);
354
355 dev = file->private_data;
356 if (mutex_lock_interruptible(&dev->mtx))
357 return -ERESTARTSYS;
358
359 /* verify that the device wasn't unplugged */
360 if (dev->disconnected) {
361 retval = -ENODEV;
362 pr_err("No device or device unplugged %d\n", retval);
363 goto exit;
364 }
365
366 /* verify that some data was requested */
367 if (count == 0) {
368 dev_dbg(&dev->udev->dev, "%s : read request of 0 bytes\n",
369 __func__);
370 goto exit;
371 }
372
373 timeout = COMMAND_TIMEOUT;
374 dev_dbg(&dev->udev->dev, "%s : about to start looping\n", __func__);
375 while (bytes_to_read) {
376 int data_in_secondary = dev->secondary_tail - dev->secondary_head;
377 dev_dbg(&dev->udev->dev,
378 "%s : while, data_in_secondary=%d, status=%d\n",
379 __func__, data_in_secondary,
380 dev->interrupt_in_urb->status);
381
382 if (data_in_secondary) {
383 /* drain secondary buffer */
384 int amount = bytes_to_read < data_in_secondary ? bytes_to_read : data_in_secondary;
385 i = copy_to_user(buffer, dev->read_buffer_secondary+dev->secondary_head, amount);
386 if (i) {
387 retval = -EFAULT;
388 goto exit;
389 }
390 dev->secondary_head += (amount - i);
391 bytes_read += (amount - i);
392 bytes_to_read -= (amount - i);
393 } else {
394 /* we check the primary buffer */
395 spin_lock_irqsave (&dev->buflock, flags);
396 if (dev->read_buffer_length) {
397 /* we secure access to the primary */
398 char *tmp;
399 dev_dbg(&dev->udev->dev,
400 "%s : swap, read_buffer_length = %d\n",
401 __func__, dev->read_buffer_length);
402 tmp = dev->read_buffer_secondary;
403 dev->read_buffer_secondary = dev->read_buffer_primary;
404 dev->read_buffer_primary = tmp;
405 dev->secondary_head = 0;
406 dev->secondary_tail = dev->read_buffer_length;
407 dev->read_buffer_length = 0;
408 spin_unlock_irqrestore(&dev->buflock, flags);
409 /* we have a free buffer so use it */
410 should_submit = 1;
411 } else {
412 /* even the primary was empty - we may need to do IO */
413 if (!dev->read_urb_finished) {
414 /* somebody is doing IO */
415 spin_unlock_irqrestore(&dev->buflock, flags);
416 dev_dbg(&dev->udev->dev,
417 "%s : submitted already\n",
418 __func__);
419 } else {
420 /* we must initiate input */
421 dev_dbg(&dev->udev->dev,
422 "%s : initiate input\n",
423 __func__);
424 dev->read_urb_finished = 0;
425 spin_unlock_irqrestore(&dev->buflock, flags);
426
427 usb_fill_int_urb(dev->interrupt_in_urb, dev->udev,
428 usb_rcvintpipe(dev->udev,
429 dev->interrupt_in_endpoint->bEndpointAddress),
430 dev->interrupt_in_buffer,
431 usb_endpoint_maxp(dev->interrupt_in_endpoint),
432 adu_interrupt_in_callback,
433 dev,
434 dev->interrupt_in_endpoint->bInterval);
435 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
436 if (retval) {
437 dev->read_urb_finished = 1;
438 if (retval == -ENOMEM) {
439 retval = bytes_read ? bytes_read : -ENOMEM;
440 }
441 dev_dbg(&dev->udev->dev,
442 "%s : submit failed\n",
443 __func__);
444 goto exit;
445 }
446 }
447
448 /* we wait for I/O to complete */
449 set_current_state(TASK_INTERRUPTIBLE);
450 add_wait_queue(&dev->read_wait, &wait);
451 spin_lock_irqsave(&dev->buflock, flags);
452 if (!dev->read_urb_finished) {
453 spin_unlock_irqrestore(&dev->buflock, flags);
454 timeout = schedule_timeout(COMMAND_TIMEOUT);
455 } else {
456 spin_unlock_irqrestore(&dev->buflock, flags);
457 set_current_state(TASK_RUNNING);
458 }
459 remove_wait_queue(&dev->read_wait, &wait);
460
461 if (timeout <= 0) {
462 dev_dbg(&dev->udev->dev,
463 "%s : timeout\n", __func__);
464 retval = bytes_read ? bytes_read : -ETIMEDOUT;
465 goto exit;
466 }
467
468 if (signal_pending(current)) {
469 dev_dbg(&dev->udev->dev,
470 "%s : signal pending\n",
471 __func__);
472 retval = bytes_read ? bytes_read : -EINTR;
473 goto exit;
474 }
475 }
476 }
477 }
478
479 retval = bytes_read;
480 /* if the primary buffer is empty then use it */
481 spin_lock_irqsave(&dev->buflock, flags);
482 if (should_submit && dev->read_urb_finished) {
483 dev->read_urb_finished = 0;
484 spin_unlock_irqrestore(&dev->buflock, flags);
485 usb_fill_int_urb(dev->interrupt_in_urb, dev->udev,
486 usb_rcvintpipe(dev->udev,
487 dev->interrupt_in_endpoint->bEndpointAddress),
488 dev->interrupt_in_buffer,
489 usb_endpoint_maxp(dev->interrupt_in_endpoint),
490 adu_interrupt_in_callback,
491 dev,
492 dev->interrupt_in_endpoint->bInterval);
493 if (usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL) != 0)
494 dev->read_urb_finished = 1;
495 /* we ignore failure */
496 } else {
497 spin_unlock_irqrestore(&dev->buflock, flags);
498 }
499
500 exit:
501 /* unlock the device */
502 mutex_unlock(&dev->mtx);
503
504 return retval;
505 }
506
adu_write(struct file * file,const __user char * buffer,size_t count,loff_t * ppos)507 static ssize_t adu_write(struct file *file, const __user char *buffer,
508 size_t count, loff_t *ppos)
509 {
510 DECLARE_WAITQUEUE(waita, current);
511 struct adu_device *dev;
512 size_t bytes_written = 0;
513 size_t bytes_to_write;
514 size_t buffer_size;
515 unsigned long flags;
516 int retval;
517
518 dev = file->private_data;
519
520 retval = mutex_lock_interruptible(&dev->mtx);
521 if (retval)
522 goto exit_nolock;
523
524 /* verify that the device wasn't unplugged */
525 if (dev->disconnected) {
526 retval = -ENODEV;
527 pr_err("No device or device unplugged %d\n", retval);
528 goto exit;
529 }
530
531 /* verify that we actually have some data to write */
532 if (count == 0) {
533 dev_dbg(&dev->udev->dev, "%s : write request of 0 bytes\n",
534 __func__);
535 goto exit;
536 }
537
538 while (count > 0) {
539 add_wait_queue(&dev->write_wait, &waita);
540 set_current_state(TASK_INTERRUPTIBLE);
541 spin_lock_irqsave(&dev->buflock, flags);
542 if (!dev->out_urb_finished) {
543 spin_unlock_irqrestore(&dev->buflock, flags);
544
545 mutex_unlock(&dev->mtx);
546 if (signal_pending(current)) {
547 dev_dbg(&dev->udev->dev, "%s : interrupted\n",
548 __func__);
549 set_current_state(TASK_RUNNING);
550 retval = -EINTR;
551 goto exit_onqueue;
552 }
553 if (schedule_timeout(COMMAND_TIMEOUT) == 0) {
554 dev_dbg(&dev->udev->dev,
555 "%s - command timed out.\n", __func__);
556 retval = -ETIMEDOUT;
557 goto exit_onqueue;
558 }
559 remove_wait_queue(&dev->write_wait, &waita);
560 retval = mutex_lock_interruptible(&dev->mtx);
561 if (retval) {
562 retval = bytes_written ? bytes_written : retval;
563 goto exit_nolock;
564 }
565
566 dev_dbg(&dev->udev->dev,
567 "%s : in progress, count = %zd\n",
568 __func__, count);
569 } else {
570 spin_unlock_irqrestore(&dev->buflock, flags);
571 set_current_state(TASK_RUNNING);
572 remove_wait_queue(&dev->write_wait, &waita);
573 dev_dbg(&dev->udev->dev, "%s : sending, count = %zd\n",
574 __func__, count);
575
576 /* write the data into interrupt_out_buffer from userspace */
577 buffer_size = usb_endpoint_maxp(dev->interrupt_out_endpoint);
578 bytes_to_write = count > buffer_size ? buffer_size : count;
579 dev_dbg(&dev->udev->dev,
580 "%s : buffer_size = %zd, count = %zd, bytes_to_write = %zd\n",
581 __func__, buffer_size, count, bytes_to_write);
582
583 if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write) != 0) {
584 retval = -EFAULT;
585 goto exit;
586 }
587
588 /* send off the urb */
589 usb_fill_int_urb(
590 dev->interrupt_out_urb,
591 dev->udev,
592 usb_sndintpipe(dev->udev, dev->interrupt_out_endpoint->bEndpointAddress),
593 dev->interrupt_out_buffer,
594 bytes_to_write,
595 adu_interrupt_out_callback,
596 dev,
597 dev->interrupt_out_endpoint->bInterval);
598 dev->interrupt_out_urb->actual_length = bytes_to_write;
599 dev->out_urb_finished = 0;
600 retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL);
601 if (retval < 0) {
602 dev->out_urb_finished = 1;
603 dev_err(&dev->udev->dev, "Couldn't submit "
604 "interrupt_out_urb %d\n", retval);
605 goto exit;
606 }
607
608 buffer += bytes_to_write;
609 count -= bytes_to_write;
610
611 bytes_written += bytes_to_write;
612 }
613 }
614 mutex_unlock(&dev->mtx);
615 return bytes_written;
616
617 exit:
618 mutex_unlock(&dev->mtx);
619 exit_nolock:
620 return retval;
621
622 exit_onqueue:
623 remove_wait_queue(&dev->write_wait, &waita);
624 return retval;
625 }
626
627 /* file operations needed when we register this driver */
628 static const struct file_operations adu_fops = {
629 .owner = THIS_MODULE,
630 .read = adu_read,
631 .write = adu_write,
632 .open = adu_open,
633 .release = adu_release,
634 .llseek = noop_llseek,
635 };
636
637 /*
638 * usb class driver info in order to get a minor number from the usb core,
639 * and to have the device registered with devfs and the driver core
640 */
641 static struct usb_class_driver adu_class = {
642 .name = "usb/adutux%d",
643 .fops = &adu_fops,
644 .minor_base = ADU_MINOR_BASE,
645 };
646
647 /**
648 * adu_probe
649 *
650 * Called by the usb core when a new device is connected that it thinks
651 * this driver might be interested in.
652 */
adu_probe(struct usb_interface * interface,const struct usb_device_id * id)653 static int adu_probe(struct usb_interface *interface,
654 const struct usb_device_id *id)
655 {
656 struct usb_device *udev = interface_to_usbdev(interface);
657 struct adu_device *dev = NULL;
658 int retval = -ENOMEM;
659 int in_end_size;
660 int out_end_size;
661 int res;
662
663 /* allocate memory for our device state and initialize it */
664 dev = kzalloc(sizeof(struct adu_device), GFP_KERNEL);
665 if (!dev)
666 return -ENOMEM;
667
668 mutex_init(&dev->mtx);
669 spin_lock_init(&dev->buflock);
670 dev->udev = usb_get_dev(udev);
671 init_waitqueue_head(&dev->read_wait);
672 init_waitqueue_head(&dev->write_wait);
673
674 res = usb_find_common_endpoints_reverse(interface->cur_altsetting,
675 NULL, NULL,
676 &dev->interrupt_in_endpoint,
677 &dev->interrupt_out_endpoint);
678 if (res) {
679 dev_err(&interface->dev, "interrupt endpoints not found\n");
680 retval = res;
681 goto error;
682 }
683
684 in_end_size = usb_endpoint_maxp(dev->interrupt_in_endpoint);
685 out_end_size = usb_endpoint_maxp(dev->interrupt_out_endpoint);
686
687 dev->read_buffer_primary = kmalloc((4 * in_end_size), GFP_KERNEL);
688 if (!dev->read_buffer_primary)
689 goto error;
690
691 /* debug code prime the buffer */
692 memset(dev->read_buffer_primary, 'a', in_end_size);
693 memset(dev->read_buffer_primary + in_end_size, 'b', in_end_size);
694 memset(dev->read_buffer_primary + (2 * in_end_size), 'c', in_end_size);
695 memset(dev->read_buffer_primary + (3 * in_end_size), 'd', in_end_size);
696
697 dev->read_buffer_secondary = kmalloc((4 * in_end_size), GFP_KERNEL);
698 if (!dev->read_buffer_secondary)
699 goto error;
700
701 /* debug code prime the buffer */
702 memset(dev->read_buffer_secondary, 'e', in_end_size);
703 memset(dev->read_buffer_secondary + in_end_size, 'f', in_end_size);
704 memset(dev->read_buffer_secondary + (2 * in_end_size), 'g', in_end_size);
705 memset(dev->read_buffer_secondary + (3 * in_end_size), 'h', in_end_size);
706
707 dev->interrupt_in_buffer = kmalloc(in_end_size, GFP_KERNEL);
708 if (!dev->interrupt_in_buffer)
709 goto error;
710
711 /* debug code prime the buffer */
712 memset(dev->interrupt_in_buffer, 'i', in_end_size);
713
714 dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
715 if (!dev->interrupt_in_urb)
716 goto error;
717 dev->interrupt_out_buffer = kmalloc(out_end_size, GFP_KERNEL);
718 if (!dev->interrupt_out_buffer)
719 goto error;
720 dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
721 if (!dev->interrupt_out_urb)
722 goto error;
723
724 if (!usb_string(udev, udev->descriptor.iSerialNumber, dev->serial_number,
725 sizeof(dev->serial_number))) {
726 dev_err(&interface->dev, "Could not retrieve serial number\n");
727 retval = -EIO;
728 goto error;
729 }
730 dev_dbg(&interface->dev,"serial_number=%s", dev->serial_number);
731
732 /* we can register the device now, as it is ready */
733 usb_set_intfdata(interface, dev);
734
735 retval = usb_register_dev(interface, &adu_class);
736
737 if (retval) {
738 /* something prevented us from registering this driver */
739 dev_err(&interface->dev, "Not able to get a minor for this device.\n");
740 usb_set_intfdata(interface, NULL);
741 goto error;
742 }
743
744 dev->minor = interface->minor;
745
746 /* let the user know what node this device is now attached to */
747 dev_info(&interface->dev, "ADU%d %s now attached to /dev/usb/adutux%d\n",
748 le16_to_cpu(udev->descriptor.idProduct), dev->serial_number,
749 (dev->minor - ADU_MINOR_BASE));
750
751 return 0;
752
753 error:
754 adu_delete(dev);
755 return retval;
756 }
757
758 /**
759 * adu_disconnect
760 *
761 * Called by the usb core when the device is removed from the system.
762 */
adu_disconnect(struct usb_interface * interface)763 static void adu_disconnect(struct usb_interface *interface)
764 {
765 struct adu_device *dev;
766
767 dev = usb_get_intfdata(interface);
768
769 usb_deregister_dev(interface, &adu_class);
770
771 usb_poison_urb(dev->interrupt_in_urb);
772 usb_poison_urb(dev->interrupt_out_urb);
773
774 mutex_lock(&adutux_mutex);
775 usb_set_intfdata(interface, NULL);
776
777 mutex_lock(&dev->mtx); /* not interruptible */
778 dev->disconnected = 1;
779 mutex_unlock(&dev->mtx);
780
781 /* if the device is not opened, then we clean up right now */
782 if (!dev->open_count)
783 adu_delete(dev);
784
785 mutex_unlock(&adutux_mutex);
786 }
787
788 /* usb specific object needed to register this driver with the usb subsystem */
789 static struct usb_driver adu_driver = {
790 .name = "adutux",
791 .probe = adu_probe,
792 .disconnect = adu_disconnect,
793 .id_table = device_table,
794 };
795
796 module_usb_driver(adu_driver);
797
798 MODULE_AUTHOR(DRIVER_AUTHOR);
799 MODULE_DESCRIPTION(DRIVER_DESC);
800 MODULE_LICENSE("GPL");
801