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Linux 3.16.75
[linux/fpc-iii.git] / drivers / usb / misc / adutux.c
blob5cfaf69bc62f8f77e2e6492758222e3ace63b191
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/errno.h>
25 #include <linux/slab.h>
26 #include <linux/module.h>
27 #include <linux/usb.h>
28 #include <linux/mutex.h>
29 #include <linux/uaccess.h>
30
31 /* Version Information */
32 #define DRIVER_VERSION "v0.0.13"
33 #define DRIVER_AUTHOR "John Homppi"
34 #define DRIVER_DESC "adutux (see www.ontrak.net)"
35
36 /* Define these values to match your device */
37 #define ADU_VENDOR_ID 0x0a07
38 #define ADU_PRODUCT_ID 0x0064
39
40 /* table of devices that work with this driver */
41 static const struct usb_device_id device_table[] = {
42 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID) }, /* ADU100 */
43 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+20) }, /* ADU120 */
44 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+30) }, /* ADU130 */
45 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+100) }, /* ADU200 */
46 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+108) }, /* ADU208 */
47 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+118) }, /* ADU218 */
48 { } /* Terminating entry */
49 };
50
51 MODULE_DEVICE_TABLE(usb, device_table);
52
53 #ifdef CONFIG_USB_DYNAMIC_MINORS
54 #define ADU_MINOR_BASE 0
55 #else
56 #define ADU_MINOR_BASE 67
57 #endif
58
59 /* we can have up to this number of device plugged in at once */
60 #define MAX_DEVICES 16
61
62 #define COMMAND_TIMEOUT (2*HZ) /* 60 second timeout for a command */
63
64 /*
65 * The locking scheme is a vanilla 3-lock:
66 * adu_device.buflock: A spinlock, covers what IRQs touch.
67 * adutux_mutex: A Static lock to cover open_count. It would also cover
68 * any globals, but we don't have them in 2.6.
69 * adu_device.mtx: A mutex to hold across sleepers like copy_from_user.
70 * It covers all of adu_device, except the open_count
71 * and what .buflock covers.
72 */
73
74 /* Structure to hold all of our device specific stuff */
75 struct adu_device {
76 struct mutex mtx;
77 struct usb_device *udev; /* save off the usb device pointer */
78 struct usb_interface *interface;
79 unsigned int minor; /* the starting minor number for this device */
80 char serial_number[8];
81
82 int open_count; /* number of times this port has been opened */
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
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 */
120 static void adu_abort_transfers(struct adu_device *dev)
121 {
122 unsigned long flags;
123
124 if (dev->udev == NULL)
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
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 kfree(dev);
155 }
156
157 static void adu_interrupt_in_callback(struct urb *urb)
158 {
159 struct adu_device *dev = urb->context;
160 int status = urb->status;
161
162 adu_debug_data(&dev->udev->dev, __func__,
163 urb->actual_length, urb->transfer_buffer);
164
165 spin_lock(&dev->buflock);
166
167 if (status != 0) {
168 if ((status != -ENOENT) && (status != -ECONNRESET) &&
169 (status != -ESHUTDOWN)) {
170 dev_dbg(&dev->udev->dev,
171 "%s : nonzero status received: %d\n",
172 __func__, status);
173 }
174 goto exit;
175 }
176
177 if (urb->actual_length > 0 && dev->interrupt_in_buffer[0] != 0x00) {
178 if (dev->read_buffer_length <
179 (4 * usb_endpoint_maxp(dev->interrupt_in_endpoint)) -
180 (urb->actual_length)) {
181 memcpy (dev->read_buffer_primary +
182 dev->read_buffer_length,
183 dev->interrupt_in_buffer, urb->actual_length);
184
185 dev->read_buffer_length += urb->actual_length;
186 dev_dbg(&dev->udev->dev,"%s reading %d\n", __func__,
187 urb->actual_length);
188 } else {
189 dev_dbg(&dev->udev->dev,"%s : read_buffer overflow\n",
190 __func__);
191 }
192 }
193
194 exit:
195 dev->read_urb_finished = 1;
196 spin_unlock(&dev->buflock);
197 /* always wake up so we recover from errors */
198 wake_up_interruptible(&dev->read_wait);
199 }
200
201 static void adu_interrupt_out_callback(struct urb *urb)
202 {
203 struct adu_device *dev = urb->context;
204 int status = urb->status;
205
206 adu_debug_data(&dev->udev->dev, __func__,
207 urb->actual_length, urb->transfer_buffer);
208
209 if (status != 0) {
210 if ((status != -ENOENT) &&
211 (status != -ECONNRESET)) {
212 dev_dbg(&dev->udev->dev,
213 "%s :nonzero status received: %d\n", __func__,
214 status);
215 }
216 return;
217 }
218
219 spin_lock(&dev->buflock);
220 dev->out_urb_finished = 1;
221 wake_up(&dev->write_wait);
222 spin_unlock(&dev->buflock);
223 }
224
225 static int adu_open(struct inode *inode, struct file *file)
226 {
227 struct adu_device *dev = NULL;
228 struct usb_interface *interface;
229 int subminor;
230 int retval;
231
232 subminor = iminor(inode);
233
234 retval = mutex_lock_interruptible(&adutux_mutex);
235 if (retval)
236 goto exit_no_lock;
237
238 interface = usb_find_interface(&adu_driver, subminor);
239 if (!interface) {
240 pr_err("%s - error, can't find device for minor %d\n",
241 __func__, subminor);
242 retval = -ENODEV;
243 goto exit_no_device;
244 }
245
246 dev = usb_get_intfdata(interface);
247 if (!dev || !dev->udev) {
248 retval = -ENODEV;
249 goto exit_no_device;
250 }
251
252 /* check that nobody else is using the device */
253 if (dev->open_count) {
254 retval = -EBUSY;
255 goto exit_no_device;
256 }
257
258 ++dev->open_count;
259 dev_dbg(&dev->udev->dev, "%s: open count %d\n", __func__,
260 dev->open_count);
261
262 /* save device in the file's private structure */
263 file->private_data = dev;
264
265 /* initialize in direction */
266 dev->read_buffer_length = 0;
267
268 /* fixup first read by having urb waiting for it */
269 usb_fill_int_urb(dev->interrupt_in_urb, dev->udev,
270 usb_rcvintpipe(dev->udev,
271 dev->interrupt_in_endpoint->bEndpointAddress),
272 dev->interrupt_in_buffer,
273 usb_endpoint_maxp(dev->interrupt_in_endpoint),
274 adu_interrupt_in_callback, dev,
275 dev->interrupt_in_endpoint->bInterval);
276 dev->read_urb_finished = 0;
277 if (usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL))
278 dev->read_urb_finished = 1;
279 /* we ignore failure */
280 /* end of fixup for first read */
281
282 /* initialize out direction */
283 dev->out_urb_finished = 1;
284
285 retval = 0;
286
287 exit_no_device:
288 mutex_unlock(&adutux_mutex);
289 exit_no_lock:
290 return retval;
291 }
292
293 static void adu_release_internal(struct adu_device *dev)
294 {
295 /* decrement our usage count for the device */
296 --dev->open_count;
297 dev_dbg(&dev->udev->dev, "%s : open count %d\n", __func__,
298 dev->open_count);
299 if (dev->open_count <= 0) {
300 adu_abort_transfers(dev);
301 dev->open_count = 0;
302 }
303 }
304
305 static int adu_release(struct inode *inode, struct file *file)
306 {
307 struct adu_device *dev;
308 int retval = 0;
309
310 if (file == NULL) {
311 retval = -ENODEV;
312 goto exit;
313 }
314
315 dev = file->private_data;
316 if (dev == NULL) {
317 retval = -ENODEV;
318 goto exit;
319 }
320
321 mutex_lock(&adutux_mutex); /* not interruptible */
322
323 if (dev->open_count <= 0) {
324 dev_dbg(&dev->udev->dev, "%s : device not opened\n", __func__);
325 retval = -ENODEV;
326 goto unlock;
327 }
328
329 adu_release_internal(dev);
330 if (dev->udev == NULL) {
331 /* the device was unplugged before the file was released */
332 if (!dev->open_count) /* ... and we're the last user */
333 adu_delete(dev);
334 }
335 unlock:
336 mutex_unlock(&adutux_mutex);
337 exit:
338 return retval;
339 }
340
341 static ssize_t adu_read(struct file *file, __user char *buffer, size_t count,
342 loff_t *ppos)
343 {
344 struct adu_device *dev;
345 size_t bytes_read = 0;
346 size_t bytes_to_read = count;
347 int i;
348 int retval = 0;
349 int timeout = 0;
350 int should_submit = 0;
351 unsigned long flags;
352 DECLARE_WAITQUEUE(wait, current);
353
354 dev = file->private_data;
355 if (mutex_lock_interruptible(&dev->mtx))
356 return -ERESTARTSYS;
357
358 /* verify that the device wasn't unplugged */
359 if (dev->udev == NULL) {
360 retval = -ENODEV;
361 pr_err("No device or device unplugged %d\n", retval);
362 goto exit;
363 }
364
365 /* verify that some data was requested */
366 if (count == 0) {
367 dev_dbg(&dev->udev->dev, "%s : read request of 0 bytes\n",
368 __func__);
369 goto exit;
370 }
371
372 timeout = COMMAND_TIMEOUT;
373 dev_dbg(&dev->udev->dev, "%s : about to start looping\n", __func__);
374 while (bytes_to_read) {
375 int data_in_secondary = dev->secondary_tail - dev->secondary_head;
376 dev_dbg(&dev->udev->dev,
377 "%s : while, data_in_secondary=%d, status=%d\n",
378 __func__, data_in_secondary,
379 dev->interrupt_in_urb->status);
380
381 if (data_in_secondary) {
382 /* drain secondary buffer */
383 int amount = bytes_to_read < data_in_secondary ? bytes_to_read : data_in_secondary;
384 i = copy_to_user(buffer, dev->read_buffer_secondary+dev->secondary_head, amount);
385 if (i) {
386 retval = -EFAULT;
387 goto exit;
388 }
389 dev->secondary_head += (amount - i);
390 bytes_read += (amount - i);
391 bytes_to_read -= (amount - i);
392 } else {
393 /* we check the primary buffer */
394 spin_lock_irqsave (&dev->buflock, flags);
395 if (dev->read_buffer_length) {
396 /* we secure access to the primary */
397 char *tmp;
398 dev_dbg(&dev->udev->dev,
399 "%s : swap, read_buffer_length = %d\n",
400 __func__, dev->read_buffer_length);
401 tmp = dev->read_buffer_secondary;
402 dev->read_buffer_secondary = dev->read_buffer_primary;
403 dev->read_buffer_primary = tmp;
404 dev->secondary_head = 0;
405 dev->secondary_tail = dev->read_buffer_length;
406 dev->read_buffer_length = 0;
407 spin_unlock_irqrestore(&dev->buflock, flags);
408 /* we have a free buffer so use it */
409 should_submit = 1;
410 } else {
411 /* even the primary was empty - we may need to do IO */
412 if (!dev->read_urb_finished) {
413 /* somebody is doing IO */
414 spin_unlock_irqrestore(&dev->buflock, flags);
415 dev_dbg(&dev->udev->dev,
416 "%s : submitted already\n",
417 __func__);
418 } else {
419 /* we must initiate input */
420 dev_dbg(&dev->udev->dev,
421 "%s : initiate input\n",
422 __func__);
423 dev->read_urb_finished = 0;
424 spin_unlock_irqrestore(&dev->buflock, flags);
425
426 usb_fill_int_urb(dev->interrupt_in_urb, dev->udev,
427 usb_rcvintpipe(dev->udev,
428 dev->interrupt_in_endpoint->bEndpointAddress),
429 dev->interrupt_in_buffer,
430 usb_endpoint_maxp(dev->interrupt_in_endpoint),
431 adu_interrupt_in_callback,
432 dev,
433 dev->interrupt_in_endpoint->bInterval);
434 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
435 if (retval) {
436 dev->read_urb_finished = 1;
437 if (retval == -ENOMEM) {
438 retval = bytes_read ? bytes_read : -ENOMEM;
439 }
440 dev_dbg(&dev->udev->dev,
441 "%s : submit failed\n",
442 __func__);
443 goto exit;
444 }
445 }
446
447 /* we wait for I/O to complete */
448 set_current_state(TASK_INTERRUPTIBLE);
449 add_wait_queue(&dev->read_wait, &wait);
450 spin_lock_irqsave(&dev->buflock, flags);
451 if (!dev->read_urb_finished) {
452 spin_unlock_irqrestore(&dev->buflock, flags);
453 timeout = schedule_timeout(COMMAND_TIMEOUT);
454 } else {
455 spin_unlock_irqrestore(&dev->buflock, flags);
456 set_current_state(TASK_RUNNING);
457 }
458 remove_wait_queue(&dev->read_wait, &wait);
459
460 if (timeout <= 0) {
461 dev_dbg(&dev->udev->dev,
462 "%s : timeout\n", __func__);
463 retval = bytes_read ? bytes_read : -ETIMEDOUT;
464 goto exit;
465 }
466
467 if (signal_pending(current)) {
468 dev_dbg(&dev->udev->dev,
469 "%s : signal pending\n",
470 __func__);
471 retval = bytes_read ? bytes_read : -EINTR;
472 goto exit;
473 }
474 }
475 }
476 }
477
478 retval = bytes_read;
479 /* if the primary buffer is empty then use it */
480 spin_lock_irqsave(&dev->buflock, flags);
481 if (should_submit && dev->read_urb_finished) {
482 dev->read_urb_finished = 0;
483 spin_unlock_irqrestore(&dev->buflock, flags);
484 usb_fill_int_urb(dev->interrupt_in_urb, dev->udev,
485 usb_rcvintpipe(dev->udev,
486 dev->interrupt_in_endpoint->bEndpointAddress),
487 dev->interrupt_in_buffer,
488 usb_endpoint_maxp(dev->interrupt_in_endpoint),
489 adu_interrupt_in_callback,
490 dev,
491 dev->interrupt_in_endpoint->bInterval);
492 if (usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL) != 0)
493 dev->read_urb_finished = 1;
494 /* we ignore failure */
495 } else {
496 spin_unlock_irqrestore(&dev->buflock, flags);
497 }
498
499 exit:
500 /* unlock the device */
501 mutex_unlock(&dev->mtx);
502
503 return retval;
504 }
505
506 static ssize_t adu_write(struct file *file, const __user char *buffer,
507 size_t count, loff_t *ppos)
508 {
509 DECLARE_WAITQUEUE(waita, current);
510 struct adu_device *dev;
511 size_t bytes_written = 0;
512 size_t bytes_to_write;
513 size_t buffer_size;
514 unsigned long flags;
515 int retval;
516
517 dev = file->private_data;
518
519 retval = mutex_lock_interruptible(&dev->mtx);
520 if (retval)
521 goto exit_nolock;
522
523 /* verify that the device wasn't unplugged */
524 if (dev->udev == NULL) {
525 retval = -ENODEV;
526 pr_err("No device or device unplugged %d\n", retval);
527 goto exit;
528 }
529
530 /* verify that we actually have some data to write */
531 if (count == 0) {
532 dev_dbg(&dev->udev->dev, "%s : write request of 0 bytes\n",
533 __func__);
534 goto exit;
535 }
536
537 while (count > 0) {
538 add_wait_queue(&dev->write_wait, &waita);
539 set_current_state(TASK_INTERRUPTIBLE);
540 spin_lock_irqsave(&dev->buflock, flags);
541 if (!dev->out_urb_finished) {
542 spin_unlock_irqrestore(&dev->buflock, flags);
543
544 mutex_unlock(&dev->mtx);
545 if (signal_pending(current)) {
546 dev_dbg(&dev->udev->dev, "%s : interrupted\n",
547 __func__);
548 set_current_state(TASK_RUNNING);
549 retval = -EINTR;
550 goto exit_onqueue;
551 }
552 if (schedule_timeout(COMMAND_TIMEOUT) == 0) {
553 dev_dbg(&dev->udev->dev,
554 "%s - command timed out.\n", __func__);
555 retval = -ETIMEDOUT;
556 goto exit_onqueue;
557 }
558 remove_wait_queue(&dev->write_wait, &waita);
559 retval = mutex_lock_interruptible(&dev->mtx);
560 if (retval) {
561 retval = bytes_written ? bytes_written : retval;
562 goto exit_nolock;
563 }
564
565 dev_dbg(&dev->udev->dev,
566 "%s : in progress, count = %Zd\n",
567 __func__, count);
568 } else {
569 spin_unlock_irqrestore(&dev->buflock, flags);
570 set_current_state(TASK_RUNNING);
571 remove_wait_queue(&dev->write_wait, &waita);
572 dev_dbg(&dev->udev->dev, "%s : sending, count = %Zd\n",
573 __func__, count);
574
575 /* write the data into interrupt_out_buffer from userspace */
576 buffer_size = usb_endpoint_maxp(dev->interrupt_out_endpoint);
577 bytes_to_write = count > buffer_size ? buffer_size : count;
578 dev_dbg(&dev->udev->dev,
579 "%s : buffer_size = %Zd, count = %Zd, bytes_to_write = %Zd\n",
580 __func__, buffer_size, count, bytes_to_write);
581
582 if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write) != 0) {
583 retval = -EFAULT;
584 goto exit;
585 }
586
587 /* send off the urb */
588 usb_fill_int_urb(
589 dev->interrupt_out_urb,
590 dev->udev,
591 usb_sndintpipe(dev->udev, dev->interrupt_out_endpoint->bEndpointAddress),
592 dev->interrupt_out_buffer,
593 bytes_to_write,
594 adu_interrupt_out_callback,
595 dev,
596 dev->interrupt_out_endpoint->bInterval);
597 dev->interrupt_out_urb->actual_length = bytes_to_write;
598 dev->out_urb_finished = 0;
599 retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL);
600 if (retval < 0) {
601 dev->out_urb_finished = 1;
602 dev_err(&dev->udev->dev, "Couldn't submit "
603 "interrupt_out_urb %d\n", retval);
604 goto exit;
605 }
606
607 buffer += bytes_to_write;
608 count -= bytes_to_write;
609
610 bytes_written += bytes_to_write;
611 }
612 }
613 mutex_unlock(&dev->mtx);
614 return bytes_written;
615
616 exit:
617 mutex_unlock(&dev->mtx);
618 exit_nolock:
619 return retval;
620
621 exit_onqueue:
622 remove_wait_queue(&dev->write_wait, &waita);
623 return retval;
624 }
625
626 /* file operations needed when we register this driver */
627 static const struct file_operations adu_fops = {
628 .owner = THIS_MODULE,
629 .read = adu_read,
630 .write = adu_write,
631 .open = adu_open,
632 .release = adu_release,
633 .llseek = noop_llseek,
634 };
635
636 /*
637 * usb class driver info in order to get a minor number from the usb core,
638 * and to have the device registered with devfs and the driver core
639 */
640 static struct usb_class_driver adu_class = {
641 .name = "usb/adutux%d",
642 .fops = &adu_fops,
643 .minor_base = ADU_MINOR_BASE,
644 };
645
646 /**
647 * adu_probe
648 *
649 * Called by the usb core when a new device is connected that it thinks
650 * this driver might be interested in.
651 */
652 static int adu_probe(struct usb_interface *interface,
653 const struct usb_device_id *id)
654 {
655 struct usb_device *udev = interface_to_usbdev(interface);
656 struct adu_device *dev = NULL;
657 struct usb_host_interface *iface_desc;
658 struct usb_endpoint_descriptor *endpoint;
659 int retval = -ENODEV;
660 int in_end_size;
661 int out_end_size;
662 int i;
663
664 if (udev == NULL) {
665 dev_err(&interface->dev, "udev is NULL.\n");
666 goto exit;
667 }
668
669 /* allocate memory for our device state and initialize it */
670 dev = kzalloc(sizeof(struct adu_device), GFP_KERNEL);
671 if (dev == NULL) {
672 dev_err(&interface->dev, "Out of memory\n");
673 retval = -ENOMEM;
674 goto exit;
675 }
676
677 mutex_init(&dev->mtx);
678 spin_lock_init(&dev->buflock);
679 dev->udev = udev;
680 init_waitqueue_head(&dev->read_wait);
681 init_waitqueue_head(&dev->write_wait);
682
683 iface_desc = &interface->altsetting[0];
684
685 /* set up the endpoint information */
686 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
687 endpoint = &iface_desc->endpoint[i].desc;
688
689 if (usb_endpoint_is_int_in(endpoint))
690 dev->interrupt_in_endpoint = endpoint;
691
692 if (usb_endpoint_is_int_out(endpoint))
693 dev->interrupt_out_endpoint = endpoint;
694 }
695 if (dev->interrupt_in_endpoint == NULL) {
696 dev_err(&interface->dev, "interrupt in endpoint not found\n");
697 goto error;
698 }
699 if (dev->interrupt_out_endpoint == NULL) {
700 dev_err(&interface->dev, "interrupt out endpoint not found\n");
701 goto error;
702 }
703
704 in_end_size = usb_endpoint_maxp(dev->interrupt_in_endpoint);
705 out_end_size = usb_endpoint_maxp(dev->interrupt_out_endpoint);
706
707 dev->read_buffer_primary = kmalloc((4 * in_end_size), GFP_KERNEL);
708 if (!dev->read_buffer_primary) {
709 dev_err(&interface->dev, "Couldn't allocate read_buffer_primary\n");
710 retval = -ENOMEM;
711 goto error;
712 }
713
714 /* debug code prime the buffer */
715 memset(dev->read_buffer_primary, 'a', in_end_size);
716 memset(dev->read_buffer_primary + in_end_size, 'b', in_end_size);
717 memset(dev->read_buffer_primary + (2 * in_end_size), 'c', in_end_size);
718 memset(dev->read_buffer_primary + (3 * in_end_size), 'd', in_end_size);
719
720 dev->read_buffer_secondary = kmalloc((4 * in_end_size), GFP_KERNEL);
721 if (!dev->read_buffer_secondary) {
722 dev_err(&interface->dev, "Couldn't allocate read_buffer_secondary\n");
723 retval = -ENOMEM;
724 goto error;
725 }
726
727 /* debug code prime the buffer */
728 memset(dev->read_buffer_secondary, 'e', in_end_size);
729 memset(dev->read_buffer_secondary + in_end_size, 'f', in_end_size);
730 memset(dev->read_buffer_secondary + (2 * in_end_size), 'g', in_end_size);
731 memset(dev->read_buffer_secondary + (3 * in_end_size), 'h', in_end_size);
732
733 dev->interrupt_in_buffer = kmalloc(in_end_size, GFP_KERNEL);
734 if (!dev->interrupt_in_buffer) {
735 dev_err(&interface->dev, "Couldn't allocate interrupt_in_buffer\n");
736 goto error;
737 }
738
739 /* debug code prime the buffer */
740 memset(dev->interrupt_in_buffer, 'i', in_end_size);
741
742 dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
743 if (!dev->interrupt_in_urb) {
744 dev_err(&interface->dev, "Couldn't allocate interrupt_in_urb\n");
745 goto error;
746 }
747 dev->interrupt_out_buffer = kmalloc(out_end_size, GFP_KERNEL);
748 if (!dev->interrupt_out_buffer) {
749 dev_err(&interface->dev, "Couldn't allocate interrupt_out_buffer\n");
750 goto error;
751 }
752 dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
753 if (!dev->interrupt_out_urb) {
754 dev_err(&interface->dev, "Couldn't allocate interrupt_out_urb\n");
755 goto error;
756 }
757
758 if (!usb_string(udev, udev->descriptor.iSerialNumber, dev->serial_number,
759 sizeof(dev->serial_number))) {
760 dev_err(&interface->dev, "Could not retrieve serial number\n");
761 goto error;
762 }
763 dev_dbg(&interface->dev,"serial_number=%s", dev->serial_number);
764
765 /* we can register the device now, as it is ready */
766 usb_set_intfdata(interface, dev);
767
768 retval = usb_register_dev(interface, &adu_class);
769
770 if (retval) {
771 /* something prevented us from registering this driver */
772 dev_err(&interface->dev, "Not able to get a minor for this device.\n");
773 usb_set_intfdata(interface, NULL);
774 goto error;
775 }
776
777 dev->minor = interface->minor;
778
779 /* let the user know what node this device is now attached to */
780 dev_info(&interface->dev, "ADU%d %s now attached to /dev/usb/adutux%d\n",
781 le16_to_cpu(udev->descriptor.idProduct), dev->serial_number,
782 (dev->minor - ADU_MINOR_BASE));
783 exit:
784 return retval;
785
786 error:
787 adu_delete(dev);
788 return retval;
789 }
790
791 /**
792 * adu_disconnect
793 *
794 * Called by the usb core when the device is removed from the system.
795 */
796 static void adu_disconnect(struct usb_interface *interface)
797 {
798 struct adu_device *dev;
799 int minor;
800
801 dev = usb_get_intfdata(interface);
802
803 mutex_lock(&dev->mtx); /* not interruptible */
804 dev->udev = NULL; /* poison */
805 minor = dev->minor;
806 usb_deregister_dev(interface, &adu_class);
807 mutex_unlock(&dev->mtx);
808
809 mutex_lock(&adutux_mutex);
810 usb_set_intfdata(interface, NULL);
811
812 /* if the device is not opened, then we clean up right now */
813 if (!dev->open_count)
814 adu_delete(dev);
815
816 mutex_unlock(&adutux_mutex);
817 }
818
819 /* usb specific object needed to register this driver with the usb subsystem */
820 static struct usb_driver adu_driver = {
821 .name = "adutux",
822 .probe = adu_probe,
823 .disconnect = adu_disconnect,
824 .id_table = device_table,
825 };
826
827 module_usb_driver(adu_driver);
828
829 MODULE_AUTHOR(DRIVER_AUTHOR);
830 MODULE_DESCRIPTION(DRIVER_DESC);
831 MODULE_LICENSE("GPL");
Linux with added FPC-III support