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Merge branch 'for-3.11' of git://linux-nfs.org/~bfields/linux
[linux-2.6.git] / drivers / usb / misc / adutux.c
blobeb3c8c142fa988de1aaaee07d036e93554bb48a3
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 #include <linux/kernel.h>
22 #include <linux/errno.h>
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/module.h>
26 #include <linux/usb.h>
27 #include <linux/mutex.h>
28 #include <linux/uaccess.h>
29
30 #ifdef CONFIG_USB_DEBUG
31 static int debug = 5;
32 #else
33 static int debug = 1;
34 #endif
35
36 /* Use our own dbg macro */
37 #undef dbg
38 #define dbg(lvl, format, arg...) \
39 do { \
40 if (debug >= lvl) \
41 printk(KERN_DEBUG "%s: " format "\n", __FILE__, ##arg); \
42 } while (0)
43
44
45 /* Version Information */
46 #define DRIVER_VERSION "v0.0.13"
47 #define DRIVER_AUTHOR "John Homppi"
48 #define DRIVER_DESC "adutux (see www.ontrak.net)"
49
50 /* Module parameters */
51 module_param(debug, int, S_IRUGO | S_IWUSR);
52 MODULE_PARM_DESC(debug, "Debug enabled or not");
53
54 /* Define these values to match your device */
55 #define ADU_VENDOR_ID 0x0a07
56 #define ADU_PRODUCT_ID 0x0064
57
58 /* table of devices that work with this driver */
59 static const struct usb_device_id device_table[] = {
60 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID) }, /* ADU100 */
61 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+20) }, /* ADU120 */
62 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+30) }, /* ADU130 */
63 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+100) }, /* ADU200 */
64 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+108) }, /* ADU208 */
65 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+118) }, /* ADU218 */
66 { } /* Terminating entry */
67 };
68
69 MODULE_DEVICE_TABLE(usb, device_table);
70
71 #ifdef CONFIG_USB_DYNAMIC_MINORS
72 #define ADU_MINOR_BASE 0
73 #else
74 #define ADU_MINOR_BASE 67
75 #endif
76
77 /* we can have up to this number of device plugged in at once */
78 #define MAX_DEVICES 16
79
80 #define COMMAND_TIMEOUT (2*HZ) /* 60 second timeout for a command */
81
82 /*
83 * The locking scheme is a vanilla 3-lock:
84 * adu_device.buflock: A spinlock, covers what IRQs touch.
85 * adutux_mutex: A Static lock to cover open_count. It would also cover
86 * any globals, but we don't have them in 2.6.
87 * adu_device.mtx: A mutex to hold across sleepers like copy_from_user.
88 * It covers all of adu_device, except the open_count
89 * and what .buflock covers.
90 */
91
92 /* Structure to hold all of our device specific stuff */
93 struct adu_device {
94 struct mutex mtx;
95 struct usb_device *udev; /* save off the usb device pointer */
96 struct usb_interface *interface;
97 unsigned int minor; /* the starting minor number for this device */
98 char serial_number[8];
99
100 int open_count; /* number of times this port has been opened */
101
102 char *read_buffer_primary;
103 int read_buffer_length;
104 char *read_buffer_secondary;
105 int secondary_head;
106 int secondary_tail;
107 spinlock_t buflock;
108
109 wait_queue_head_t read_wait;
110 wait_queue_head_t write_wait;
111
112 char *interrupt_in_buffer;
113 struct usb_endpoint_descriptor *interrupt_in_endpoint;
114 struct urb *interrupt_in_urb;
115 int read_urb_finished;
116
117 char *interrupt_out_buffer;
118 struct usb_endpoint_descriptor *interrupt_out_endpoint;
119 struct urb *interrupt_out_urb;
120 int out_urb_finished;
121 };
122
123 static DEFINE_MUTEX(adutux_mutex);
124
125 static struct usb_driver adu_driver;
126
127 static void adu_debug_data(int level, const char *function, int size,
128 const unsigned char *data)
129 {
130 int i;
131
132 if (debug < level)
133 return;
134
135 printk(KERN_DEBUG "%s: %s - length = %d, data = ",
136 __FILE__, function, size);
137 for (i = 0; i < size; ++i)
138 printk("%.2x ", data[i]);
139 printk("\n");
140 }
141
142 /**
143 * adu_abort_transfers
144 * aborts transfers and frees associated data structures
145 */
146 static void adu_abort_transfers(struct adu_device *dev)
147 {
148 unsigned long flags;
149
150 dbg(2, " %s : enter", __func__);
151
152 if (dev->udev == NULL) {
153 dbg(1, " %s : udev is null", __func__);
154 goto exit;
155 }
156
157 /* shutdown transfer */
158
159 /* XXX Anchor these instead */
160 spin_lock_irqsave(&dev->buflock, flags);
161 if (!dev->read_urb_finished) {
162 spin_unlock_irqrestore(&dev->buflock, flags);
163 usb_kill_urb(dev->interrupt_in_urb);
164 } else
165 spin_unlock_irqrestore(&dev->buflock, flags);
166
167 spin_lock_irqsave(&dev->buflock, flags);
168 if (!dev->out_urb_finished) {
169 spin_unlock_irqrestore(&dev->buflock, flags);
170 usb_kill_urb(dev->interrupt_out_urb);
171 } else
172 spin_unlock_irqrestore(&dev->buflock, flags);
173
174 exit:
175 dbg(2, " %s : leave", __func__);
176 }
177
178 static void adu_delete(struct adu_device *dev)
179 {
180 dbg(2, "%s enter", __func__);
181
182 /* free data structures */
183 usb_free_urb(dev->interrupt_in_urb);
184 usb_free_urb(dev->interrupt_out_urb);
185 kfree(dev->read_buffer_primary);
186 kfree(dev->read_buffer_secondary);
187 kfree(dev->interrupt_in_buffer);
188 kfree(dev->interrupt_out_buffer);
189 kfree(dev);
190
191 dbg(2, "%s : leave", __func__);
192 }
193
194 static void adu_interrupt_in_callback(struct urb *urb)
195 {
196 struct adu_device *dev = urb->context;
197 int status = urb->status;
198
199 dbg(4, " %s : enter, status %d", __func__, status);
200 adu_debug_data(5, __func__, urb->actual_length,
201 urb->transfer_buffer);
202
203 spin_lock(&dev->buflock);
204
205 if (status != 0) {
206 if ((status != -ENOENT) && (status != -ECONNRESET) &&
207 (status != -ESHUTDOWN)) {
208 dbg(1, " %s : nonzero status received: %d",
209 __func__, status);
210 }
211 goto exit;
212 }
213
214 if (urb->actual_length > 0 && dev->interrupt_in_buffer[0] != 0x00) {
215 if (dev->read_buffer_length <
216 (4 * usb_endpoint_maxp(dev->interrupt_in_endpoint)) -
217 (urb->actual_length)) {
218 memcpy (dev->read_buffer_primary +
219 dev->read_buffer_length,
220 dev->interrupt_in_buffer, urb->actual_length);
221
222 dev->read_buffer_length += urb->actual_length;
223 dbg(2, " %s reading %d ", __func__,
224 urb->actual_length);
225 } else {
226 dbg(1, " %s : read_buffer overflow", __func__);
227 }
228 }
229
230 exit:
231 dev->read_urb_finished = 1;
232 spin_unlock(&dev->buflock);
233 /* always wake up so we recover from errors */
234 wake_up_interruptible(&dev->read_wait);
235 adu_debug_data(5, __func__, urb->actual_length,
236 urb->transfer_buffer);
237 dbg(4, " %s : leave, status %d", __func__, status);
238 }
239
240 static void adu_interrupt_out_callback(struct urb *urb)
241 {
242 struct adu_device *dev = urb->context;
243 int status = urb->status;
244
245 dbg(4, " %s : enter, status %d", __func__, status);
246 adu_debug_data(5, __func__, urb->actual_length, urb->transfer_buffer);
247
248 if (status != 0) {
249 if ((status != -ENOENT) &&
250 (status != -ECONNRESET)) {
251 dbg(1, " %s :nonzero status received: %d",
252 __func__, status);
253 }
254 goto exit;
255 }
256
257 spin_lock(&dev->buflock);
258 dev->out_urb_finished = 1;
259 wake_up(&dev->write_wait);
260 spin_unlock(&dev->buflock);
261 exit:
262
263 adu_debug_data(5, __func__, urb->actual_length,
264 urb->transfer_buffer);
265 dbg(4, " %s : leave, status %d", __func__, status);
266 }
267
268 static int adu_open(struct inode *inode, struct file *file)
269 {
270 struct adu_device *dev = NULL;
271 struct usb_interface *interface;
272 int subminor;
273 int retval;
274
275 dbg(2, "%s : enter", __func__);
276
277 subminor = iminor(inode);
278
279 retval = mutex_lock_interruptible(&adutux_mutex);
280 if (retval) {
281 dbg(2, "%s : mutex lock failed", __func__);
282 goto exit_no_lock;
283 }
284
285 interface = usb_find_interface(&adu_driver, subminor);
286 if (!interface) {
287 printk(KERN_ERR "adutux: %s - error, can't find device for "
288 "minor %d\n", __func__, subminor);
289 retval = -ENODEV;
290 goto exit_no_device;
291 }
292
293 dev = usb_get_intfdata(interface);
294 if (!dev || !dev->udev) {
295 retval = -ENODEV;
296 goto exit_no_device;
297 }
298
299 /* check that nobody else is using the device */
300 if (dev->open_count) {
301 retval = -EBUSY;
302 goto exit_no_device;
303 }
304
305 ++dev->open_count;
306 dbg(2, "%s : open count %d", __func__, dev->open_count);
307
308 /* save device in the file's private structure */
309 file->private_data = dev;
310
311 /* initialize in direction */
312 dev->read_buffer_length = 0;
313
314 /* fixup first read by having urb waiting for it */
315 usb_fill_int_urb(dev->interrupt_in_urb, dev->udev,
316 usb_rcvintpipe(dev->udev,
317 dev->interrupt_in_endpoint->bEndpointAddress),
318 dev->interrupt_in_buffer,
319 usb_endpoint_maxp(dev->interrupt_in_endpoint),
320 adu_interrupt_in_callback, dev,
321 dev->interrupt_in_endpoint->bInterval);
322 dev->read_urb_finished = 0;
323 if (usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL))
324 dev->read_urb_finished = 1;
325 /* we ignore failure */
326 /* end of fixup for first read */
327
328 /* initialize out direction */
329 dev->out_urb_finished = 1;
330
331 retval = 0;
332
333 exit_no_device:
334 mutex_unlock(&adutux_mutex);
335 exit_no_lock:
336 dbg(2, "%s : leave, return value %d ", __func__, retval);
337 return retval;
338 }
339
340 static void adu_release_internal(struct adu_device *dev)
341 {
342 dbg(2, " %s : enter", __func__);
343
344 /* decrement our usage count for the device */
345 --dev->open_count;
346 dbg(2, " %s : open count %d", __func__, dev->open_count);
347 if (dev->open_count <= 0) {
348 adu_abort_transfers(dev);
349 dev->open_count = 0;
350 }
351
352 dbg(2, " %s : leave", __func__);
353 }
354
355 static int adu_release(struct inode *inode, struct file *file)
356 {
357 struct adu_device *dev;
358 int retval = 0;
359
360 dbg(2, " %s : enter", __func__);
361
362 if (file == NULL) {
363 dbg(1, " %s : file is NULL", __func__);
364 retval = -ENODEV;
365 goto exit;
366 }
367
368 dev = file->private_data;
369 if (dev == NULL) {
370 dbg(1, " %s : object is NULL", __func__);
371 retval = -ENODEV;
372 goto exit;
373 }
374
375 mutex_lock(&adutux_mutex); /* not interruptible */
376
377 if (dev->open_count <= 0) {
378 dbg(1, " %s : device not opened", __func__);
379 retval = -ENODEV;
380 goto unlock;
381 }
382
383 adu_release_internal(dev);
384 if (dev->udev == NULL) {
385 /* the device was unplugged before the file was released */
386 if (!dev->open_count) /* ... and we're the last user */
387 adu_delete(dev);
388 }
389 unlock:
390 mutex_unlock(&adutux_mutex);
391 exit:
392 dbg(2, " %s : leave, return value %d", __func__, retval);
393 return retval;
394 }
395
396 static ssize_t adu_read(struct file *file, __user char *buffer, size_t count,
397 loff_t *ppos)
398 {
399 struct adu_device *dev;
400 size_t bytes_read = 0;
401 size_t bytes_to_read = count;
402 int i;
403 int retval = 0;
404 int timeout = 0;
405 int should_submit = 0;
406 unsigned long flags;
407 DECLARE_WAITQUEUE(wait, current);
408
409 dbg(2, " %s : enter, count = %Zd, file=%p", __func__, count, file);
410
411 dev = file->private_data;
412 dbg(2, " %s : dev=%p", __func__, dev);
413
414 if (mutex_lock_interruptible(&dev->mtx))
415 return -ERESTARTSYS;
416
417 /* verify that the device wasn't unplugged */
418 if (dev->udev == NULL) {
419 retval = -ENODEV;
420 printk(KERN_ERR "adutux: No device or device unplugged %d\n",
421 retval);
422 goto exit;
423 }
424
425 /* verify that some data was requested */
426 if (count == 0) {
427 dbg(1, " %s : read request of 0 bytes", __func__);
428 goto exit;
429 }
430
431 timeout = COMMAND_TIMEOUT;
432 dbg(2, " %s : about to start looping", __func__);
433 while (bytes_to_read) {
434 int data_in_secondary = dev->secondary_tail - dev->secondary_head;
435 dbg(2, " %s : while, data_in_secondary=%d, status=%d",
436 __func__, data_in_secondary,
437 dev->interrupt_in_urb->status);
438
439 if (data_in_secondary) {
440 /* drain secondary buffer */
441 int amount = bytes_to_read < data_in_secondary ? bytes_to_read : data_in_secondary;
442 i = copy_to_user(buffer, dev->read_buffer_secondary+dev->secondary_head, amount);
443 if (i) {
444 retval = -EFAULT;
445 goto exit;
446 }
447 dev->secondary_head += (amount - i);
448 bytes_read += (amount - i);
449 bytes_to_read -= (amount - i);
450 if (i) {
451 retval = bytes_read ? bytes_read : -EFAULT;
452 goto exit;
453 }
454 } else {
455 /* we check the primary buffer */
456 spin_lock_irqsave (&dev->buflock, flags);
457 if (dev->read_buffer_length) {
458 /* we secure access to the primary */
459 char *tmp;
460 dbg(2, " %s : swap, read_buffer_length = %d",
461 __func__, dev->read_buffer_length);
462 tmp = dev->read_buffer_secondary;
463 dev->read_buffer_secondary = dev->read_buffer_primary;
464 dev->read_buffer_primary = tmp;
465 dev->secondary_head = 0;
466 dev->secondary_tail = dev->read_buffer_length;
467 dev->read_buffer_length = 0;
468 spin_unlock_irqrestore(&dev->buflock, flags);
469 /* we have a free buffer so use it */
470 should_submit = 1;
471 } else {
472 /* even the primary was empty - we may need to do IO */
473 if (!dev->read_urb_finished) {
474 /* somebody is doing IO */
475 spin_unlock_irqrestore(&dev->buflock, flags);
476 dbg(2, " %s : submitted already", __func__);
477 } else {
478 /* we must initiate input */
479 dbg(2, " %s : initiate input", __func__);
480 dev->read_urb_finished = 0;
481 spin_unlock_irqrestore(&dev->buflock, flags);
482
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 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
492 if (retval) {
493 dev->read_urb_finished = 1;
494 if (retval == -ENOMEM) {
495 retval = bytes_read ? bytes_read : -ENOMEM;
496 }
497 dbg(2, " %s : submit failed", __func__);
498 goto exit;
499 }
500 }
501
502 /* we wait for I/O to complete */
503 set_current_state(TASK_INTERRUPTIBLE);
504 add_wait_queue(&dev->read_wait, &wait);
505 spin_lock_irqsave(&dev->buflock, flags);
506 if (!dev->read_urb_finished) {
507 spin_unlock_irqrestore(&dev->buflock, flags);
508 timeout = schedule_timeout(COMMAND_TIMEOUT);
509 } else {
510 spin_unlock_irqrestore(&dev->buflock, flags);
511 set_current_state(TASK_RUNNING);
512 }
513 remove_wait_queue(&dev->read_wait, &wait);
514
515 if (timeout <= 0) {
516 dbg(2, " %s : timeout", __func__);
517 retval = bytes_read ? bytes_read : -ETIMEDOUT;
518 goto exit;
519 }
520
521 if (signal_pending(current)) {
522 dbg(2, " %s : signal pending", __func__);
523 retval = bytes_read ? bytes_read : -EINTR;
524 goto exit;
525 }
526 }
527 }
528 }
529
530 retval = bytes_read;
531 /* if the primary buffer is empty then use it */
532 spin_lock_irqsave(&dev->buflock, flags);
533 if (should_submit && dev->read_urb_finished) {
534 dev->read_urb_finished = 0;
535 spin_unlock_irqrestore(&dev->buflock, flags);
536 usb_fill_int_urb(dev->interrupt_in_urb, dev->udev,
537 usb_rcvintpipe(dev->udev,
538 dev->interrupt_in_endpoint->bEndpointAddress),
539 dev->interrupt_in_buffer,
540 usb_endpoint_maxp(dev->interrupt_in_endpoint),
541 adu_interrupt_in_callback,
542 dev,
543 dev->interrupt_in_endpoint->bInterval);
544 if (usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL) != 0)
545 dev->read_urb_finished = 1;
546 /* we ignore failure */
547 } else {
548 spin_unlock_irqrestore(&dev->buflock, flags);
549 }
550
551 exit:
552 /* unlock the device */
553 mutex_unlock(&dev->mtx);
554
555 dbg(2, " %s : leave, return value %d", __func__, retval);
556 return retval;
557 }
558
559 static ssize_t adu_write(struct file *file, const __user char *buffer,
560 size_t count, loff_t *ppos)
561 {
562 DECLARE_WAITQUEUE(waita, current);
563 struct adu_device *dev;
564 size_t bytes_written = 0;
565 size_t bytes_to_write;
566 size_t buffer_size;
567 unsigned long flags;
568 int retval;
569
570 dbg(2, " %s : enter, count = %Zd", __func__, count);
571
572 dev = file->private_data;
573
574 retval = mutex_lock_interruptible(&dev->mtx);
575 if (retval)
576 goto exit_nolock;
577
578 /* verify that the device wasn't unplugged */
579 if (dev->udev == NULL) {
580 retval = -ENODEV;
581 printk(KERN_ERR "adutux: No device or device unplugged %d\n",
582 retval);
583 goto exit;
584 }
585
586 /* verify that we actually have some data to write */
587 if (count == 0) {
588 dbg(1, " %s : write request of 0 bytes", __func__);
589 goto exit;
590 }
591
592 while (count > 0) {
593 add_wait_queue(&dev->write_wait, &waita);
594 set_current_state(TASK_INTERRUPTIBLE);
595 spin_lock_irqsave(&dev->buflock, flags);
596 if (!dev->out_urb_finished) {
597 spin_unlock_irqrestore(&dev->buflock, flags);
598
599 mutex_unlock(&dev->mtx);
600 if (signal_pending(current)) {
601 dbg(1, " %s : interrupted", __func__);
602 set_current_state(TASK_RUNNING);
603 retval = -EINTR;
604 goto exit_onqueue;
605 }
606 if (schedule_timeout(COMMAND_TIMEOUT) == 0) {
607 dbg(1, "%s - command timed out.", __func__);
608 retval = -ETIMEDOUT;
609 goto exit_onqueue;
610 }
611 remove_wait_queue(&dev->write_wait, &waita);
612 retval = mutex_lock_interruptible(&dev->mtx);
613 if (retval) {
614 retval = bytes_written ? bytes_written : retval;
615 goto exit_nolock;
616 }
617
618 dbg(4, " %s : in progress, count = %Zd", __func__, count);
619 } else {
620 spin_unlock_irqrestore(&dev->buflock, flags);
621 set_current_state(TASK_RUNNING);
622 remove_wait_queue(&dev->write_wait, &waita);
623 dbg(4, " %s : sending, count = %Zd", __func__, count);
624
625 /* write the data into interrupt_out_buffer from userspace */
626 buffer_size = usb_endpoint_maxp(dev->interrupt_out_endpoint);
627 bytes_to_write = count > buffer_size ? buffer_size : count;
628 dbg(4, " %s : buffer_size = %Zd, count = %Zd, bytes_to_write = %Zd",
629 __func__, buffer_size, count, bytes_to_write);
630
631 if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write) != 0) {
632 retval = -EFAULT;
633 goto exit;
634 }
635
636 /* send off the urb */
637 usb_fill_int_urb(
638 dev->interrupt_out_urb,
639 dev->udev,
640 usb_sndintpipe(dev->udev, dev->interrupt_out_endpoint->bEndpointAddress),
641 dev->interrupt_out_buffer,
642 bytes_to_write,
643 adu_interrupt_out_callback,
644 dev,
645 dev->interrupt_out_endpoint->bInterval);
646 dev->interrupt_out_urb->actual_length = bytes_to_write;
647 dev->out_urb_finished = 0;
648 retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL);
649 if (retval < 0) {
650 dev->out_urb_finished = 1;
651 dev_err(&dev->udev->dev, "Couldn't submit "
652 "interrupt_out_urb %d\n", retval);
653 goto exit;
654 }
655
656 buffer += bytes_to_write;
657 count -= bytes_to_write;
658
659 bytes_written += bytes_to_write;
660 }
661 }
662 mutex_unlock(&dev->mtx);
663 return bytes_written;
664
665 exit:
666 mutex_unlock(&dev->mtx);
667 exit_nolock:
668 dbg(2, " %s : leave, return value %d", __func__, retval);
669 return retval;
670
671 exit_onqueue:
672 remove_wait_queue(&dev->write_wait, &waita);
673 return retval;
674 }
675
676 /* file operations needed when we register this driver */
677 static const struct file_operations adu_fops = {
678 .owner = THIS_MODULE,
679 .read = adu_read,
680 .write = adu_write,
681 .open = adu_open,
682 .release = adu_release,
683 .llseek = noop_llseek,
684 };
685
686 /*
687 * usb class driver info in order to get a minor number from the usb core,
688 * and to have the device registered with devfs and the driver core
689 */
690 static struct usb_class_driver adu_class = {
691 .name = "usb/adutux%d",
692 .fops = &adu_fops,
693 .minor_base = ADU_MINOR_BASE,
694 };
695
696 /**
697 * adu_probe
698 *
699 * Called by the usb core when a new device is connected that it thinks
700 * this driver might be interested in.
701 */
702 static int adu_probe(struct usb_interface *interface,
703 const struct usb_device_id *id)
704 {
705 struct usb_device *udev = interface_to_usbdev(interface);
706 struct adu_device *dev = NULL;
707 struct usb_host_interface *iface_desc;
708 struct usb_endpoint_descriptor *endpoint;
709 int retval = -ENODEV;
710 int in_end_size;
711 int out_end_size;
712 int i;
713
714 dbg(2, " %s : enter", __func__);
715
716 if (udev == NULL) {
717 dev_err(&interface->dev, "udev is NULL.\n");
718 goto exit;
719 }
720
721 /* allocate memory for our device state and initialize it */
722 dev = kzalloc(sizeof(struct adu_device), GFP_KERNEL);
723 if (dev == NULL) {
724 dev_err(&interface->dev, "Out of memory\n");
725 retval = -ENOMEM;
726 goto exit;
727 }
728
729 mutex_init(&dev->mtx);
730 spin_lock_init(&dev->buflock);
731 dev->udev = udev;
732 init_waitqueue_head(&dev->read_wait);
733 init_waitqueue_head(&dev->write_wait);
734
735 iface_desc = &interface->altsetting[0];
736
737 /* set up the endpoint information */
738 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
739 endpoint = &iface_desc->endpoint[i].desc;
740
741 if (usb_endpoint_is_int_in(endpoint))
742 dev->interrupt_in_endpoint = endpoint;
743
744 if (usb_endpoint_is_int_out(endpoint))
745 dev->interrupt_out_endpoint = endpoint;
746 }
747 if (dev->interrupt_in_endpoint == NULL) {
748 dev_err(&interface->dev, "interrupt in endpoint not found\n");
749 goto error;
750 }
751 if (dev->interrupt_out_endpoint == NULL) {
752 dev_err(&interface->dev, "interrupt out endpoint not found\n");
753 goto error;
754 }
755
756 in_end_size = usb_endpoint_maxp(dev->interrupt_in_endpoint);
757 out_end_size = usb_endpoint_maxp(dev->interrupt_out_endpoint);
758
759 dev->read_buffer_primary = kmalloc((4 * in_end_size), GFP_KERNEL);
760 if (!dev->read_buffer_primary) {
761 dev_err(&interface->dev, "Couldn't allocate read_buffer_primary\n");
762 retval = -ENOMEM;
763 goto error;
764 }
765
766 /* debug code prime the buffer */
767 memset(dev->read_buffer_primary, 'a', in_end_size);
768 memset(dev->read_buffer_primary + in_end_size, 'b', in_end_size);
769 memset(dev->read_buffer_primary + (2 * in_end_size), 'c', in_end_size);
770 memset(dev->read_buffer_primary + (3 * in_end_size), 'd', in_end_size);
771
772 dev->read_buffer_secondary = kmalloc((4 * in_end_size), GFP_KERNEL);
773 if (!dev->read_buffer_secondary) {
774 dev_err(&interface->dev, "Couldn't allocate read_buffer_secondary\n");
775 retval = -ENOMEM;
776 goto error;
777 }
778
779 /* debug code prime the buffer */
780 memset(dev->read_buffer_secondary, 'e', in_end_size);
781 memset(dev->read_buffer_secondary + in_end_size, 'f', in_end_size);
782 memset(dev->read_buffer_secondary + (2 * in_end_size), 'g', in_end_size);
783 memset(dev->read_buffer_secondary + (3 * in_end_size), 'h', in_end_size);
784
785 dev->interrupt_in_buffer = kmalloc(in_end_size, GFP_KERNEL);
786 if (!dev->interrupt_in_buffer) {
787 dev_err(&interface->dev, "Couldn't allocate interrupt_in_buffer\n");
788 goto error;
789 }
790
791 /* debug code prime the buffer */
792 memset(dev->interrupt_in_buffer, 'i', in_end_size);
793
794 dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
795 if (!dev->interrupt_in_urb) {
796 dev_err(&interface->dev, "Couldn't allocate interrupt_in_urb\n");
797 goto error;
798 }
799 dev->interrupt_out_buffer = kmalloc(out_end_size, GFP_KERNEL);
800 if (!dev->interrupt_out_buffer) {
801 dev_err(&interface->dev, "Couldn't allocate interrupt_out_buffer\n");
802 goto error;
803 }
804 dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
805 if (!dev->interrupt_out_urb) {
806 dev_err(&interface->dev, "Couldn't allocate interrupt_out_urb\n");
807 goto error;
808 }
809
810 if (!usb_string(udev, udev->descriptor.iSerialNumber, dev->serial_number,
811 sizeof(dev->serial_number))) {
812 dev_err(&interface->dev, "Could not retrieve serial number\n");
813 goto error;
814 }
815 dbg(2, " %s : serial_number=%s", __func__, dev->serial_number);
816
817 /* we can register the device now, as it is ready */
818 usb_set_intfdata(interface, dev);
819
820 retval = usb_register_dev(interface, &adu_class);
821
822 if (retval) {
823 /* something prevented us from registering this driver */
824 dev_err(&interface->dev, "Not able to get a minor for this device.\n");
825 usb_set_intfdata(interface, NULL);
826 goto error;
827 }
828
829 dev->minor = interface->minor;
830
831 /* let the user know what node this device is now attached to */
832 dev_info(&interface->dev, "ADU%d %s now attached to /dev/usb/adutux%d\n",
833 udev->descriptor.idProduct, dev->serial_number,
834 (dev->minor - ADU_MINOR_BASE));
835 exit:
836 dbg(2, " %s : leave, return value %p (dev)", __func__, dev);
837
838 return retval;
839
840 error:
841 adu_delete(dev);
842 return retval;
843 }
844
845 /**
846 * adu_disconnect
847 *
848 * Called by the usb core when the device is removed from the system.
849 */
850 static void adu_disconnect(struct usb_interface *interface)
851 {
852 struct adu_device *dev;
853 int minor;
854
855 dbg(2, " %s : enter", __func__);
856
857 dev = usb_get_intfdata(interface);
858
859 mutex_lock(&dev->mtx); /* not interruptible */
860 dev->udev = NULL; /* poison */
861 minor = dev->minor;
862 usb_deregister_dev(interface, &adu_class);
863 mutex_unlock(&dev->mtx);
864
865 mutex_lock(&adutux_mutex);
866 usb_set_intfdata(interface, NULL);
867
868 /* if the device is not opened, then we clean up right now */
869 dbg(2, " %s : open count %d", __func__, dev->open_count);
870 if (!dev->open_count)
871 adu_delete(dev);
872
873 mutex_unlock(&adutux_mutex);
874
875 dev_info(&interface->dev, "ADU device adutux%d now disconnected\n",
876 (minor - ADU_MINOR_BASE));
877
878 dbg(2, " %s : leave", __func__);
879 }
880
881 /* usb specific object needed to register this driver with the usb subsystem */
882 static struct usb_driver adu_driver = {
883 .name = "adutux",
884 .probe = adu_probe,
885 .disconnect = adu_disconnect,
886 .id_table = device_table,
887 };
888
889 module_usb_driver(adu_driver);
890
891 MODULE_AUTHOR(DRIVER_AUTHOR);
892 MODULE_DESCRIPTION(DRIVER_DESC);
893 MODULE_LICENSE("GPL");
Linus' kernel tree