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USB: misc: adtux: clean up urb->status usage
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / usb / misc / adutux.c
blobe9fdbc8997b32c2be588a3b52030448c4a689307
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 <asm/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 __FILE__ " : " format " \n", ## 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 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 /* Structure to hold all of our device specific stuff */
83 struct adu_device {
84 struct mutex mtx; /* locks this structure */
85 struct usb_device* udev; /* save off the usb device pointer */
86 struct usb_interface* interface;
87 unsigned char minor; /* the starting minor number for this device */
88 char serial_number[8];
89
90 int open_count; /* number of times this port has been opened */
91
92 char* read_buffer_primary;
93 int read_buffer_length;
94 char* read_buffer_secondary;
95 int secondary_head;
96 int secondary_tail;
97 spinlock_t buflock;
98
99 wait_queue_head_t read_wait;
100 wait_queue_head_t write_wait;
101
102 char* interrupt_in_buffer;
103 struct usb_endpoint_descriptor* interrupt_in_endpoint;
104 struct urb* interrupt_in_urb;
105 int read_urb_finished;
106
107 char* interrupt_out_buffer;
108 struct usb_endpoint_descriptor* interrupt_out_endpoint;
109 struct urb* interrupt_out_urb;
110 };
111
112 static struct usb_driver adu_driver;
113
114 static void adu_debug_data(int level, const char *function, int size,
115 const unsigned char *data)
116 {
117 int i;
118
119 if (debug < level)
120 return;
121
122 printk(KERN_DEBUG __FILE__": %s - length = %d, data = ",
123 function, size);
124 for (i = 0; i < size; ++i)
125 printk("%.2x ", data[i]);
126 printk("\n");
127 }
128
129 /**
130 * adu_abort_transfers
131 * aborts transfers and frees associated data structures
132 */
133 static void adu_abort_transfers(struct adu_device *dev)
134 {
135 dbg(2," %s : enter", __FUNCTION__);
136
137 if (dev == NULL) {
138 dbg(1," %s : dev is null", __FUNCTION__);
139 goto exit;
140 }
141
142 if (dev->udev == NULL) {
143 dbg(1," %s : udev is null", __FUNCTION__);
144 goto exit;
145 }
146
147 dbg(2," %s : udev state %d", __FUNCTION__, dev->udev->state);
148 if (dev->udev->state == USB_STATE_NOTATTACHED) {
149 dbg(1," %s : udev is not attached", __FUNCTION__);
150 goto exit;
151 }
152
153 /* shutdown transfer */
154 usb_unlink_urb(dev->interrupt_in_urb);
155 usb_unlink_urb(dev->interrupt_out_urb);
156
157 exit:
158 dbg(2," %s : leave", __FUNCTION__);
159 }
160
161 static void adu_delete(struct adu_device *dev)
162 {
163 dbg(2, "%s enter", __FUNCTION__);
164
165 adu_abort_transfers(dev);
166
167 /* free data structures */
168 usb_free_urb(dev->interrupt_in_urb);
169 usb_free_urb(dev->interrupt_out_urb);
170 kfree(dev->read_buffer_primary);
171 kfree(dev->read_buffer_secondary);
172 kfree(dev->interrupt_in_buffer);
173 kfree(dev->interrupt_out_buffer);
174 kfree(dev);
175
176 dbg(2, "%s : leave", __FUNCTION__);
177 }
178
179 static void adu_interrupt_in_callback(struct urb *urb)
180 {
181 struct adu_device *dev = urb->context;
182 int status = urb->status;
183
184 dbg(4," %s : enter, status %d", __FUNCTION__, status);
185 adu_debug_data(5, __FUNCTION__, urb->actual_length,
186 urb->transfer_buffer);
187
188 spin_lock(&dev->buflock);
189
190 if (status != 0) {
191 if ((status != -ENOENT) && (status != -ECONNRESET)) {
192 dbg(1," %s : nonzero status received: %d",
193 __FUNCTION__, status);
194 }
195 goto exit;
196 }
197
198 if (urb->actual_length > 0 && dev->interrupt_in_buffer[0] != 0x00) {
199 if (dev->read_buffer_length <
200 (4 * le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize)) -
201 (urb->actual_length)) {
202 memcpy (dev->read_buffer_primary +
203 dev->read_buffer_length,
204 dev->interrupt_in_buffer, urb->actual_length);
205
206 dev->read_buffer_length += urb->actual_length;
207 dbg(2," %s reading %d ", __FUNCTION__,
208 urb->actual_length);
209 } else {
210 dbg(1," %s : read_buffer overflow", __FUNCTION__);
211 }
212 }
213
214 exit:
215 dev->read_urb_finished = 1;
216 spin_unlock(&dev->buflock);
217 /* always wake up so we recover from errors */
218 wake_up_interruptible(&dev->read_wait);
219 adu_debug_data(5, __FUNCTION__, urb->actual_length,
220 urb->transfer_buffer);
221 dbg(4," %s : leave, status %d", __FUNCTION__, status);
222 }
223
224 static void adu_interrupt_out_callback(struct urb *urb)
225 {
226 struct adu_device *dev = urb->context;
227 int status = urb->status;
228
229 dbg(4," %s : enter, status %d", __FUNCTION__, status);
230 adu_debug_data(5,__FUNCTION__, urb->actual_length, urb->transfer_buffer);
231
232 if (status != 0) {
233 if ((status != -ENOENT) &&
234 (status != -ECONNRESET)) {
235 dbg(1, " %s :nonzero status received: %d",
236 __FUNCTION__, status);
237 }
238 goto exit;
239 }
240
241 wake_up_interruptible(&dev->write_wait);
242 exit:
243
244 adu_debug_data(5, __FUNCTION__, urb->actual_length,
245 urb->transfer_buffer);
246 dbg(4," %s : leave, status %d", __FUNCTION__, status);
247 }
248
249 static int adu_open(struct inode *inode, struct file *file)
250 {
251 struct adu_device *dev = NULL;
252 struct usb_interface *interface;
253 int subminor;
254 int retval = 0;
255
256 dbg(2,"%s : enter", __FUNCTION__);
257
258 subminor = iminor(inode);
259
260 interface = usb_find_interface(&adu_driver, subminor);
261 if (!interface) {
262 err("%s - error, can't find device for minor %d",
263 __FUNCTION__, subminor);
264 retval = -ENODEV;
265 goto exit_no_device;
266 }
267
268 dev = usb_get_intfdata(interface);
269 if (!dev) {
270 retval = -ENODEV;
271 goto exit_no_device;
272 }
273
274 /* lock this device */
275 if ((retval = mutex_lock_interruptible(&dev->mtx))) {
276 dbg(2, "%s : mutex lock failed", __FUNCTION__);
277 goto exit_no_device;
278 }
279
280 /* increment our usage count for the device */
281 ++dev->open_count;
282 dbg(2,"%s : open count %d", __FUNCTION__, dev->open_count);
283
284 /* save device in the file's private structure */
285 file->private_data = dev;
286
287 if (dev->open_count == 1) {
288 /* initialize in direction */
289 dev->read_buffer_length = 0;
290
291 /* fixup first read by having urb waiting for it */
292 usb_fill_int_urb(dev->interrupt_in_urb,dev->udev,
293 usb_rcvintpipe(dev->udev,
294 dev->interrupt_in_endpoint->bEndpointAddress),
295 dev->interrupt_in_buffer,
296 le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize),
297 adu_interrupt_in_callback, dev,
298 dev->interrupt_in_endpoint->bInterval);
299 /* dev->interrupt_in_urb->transfer_flags |= URB_ASYNC_UNLINK; */
300 dev->read_urb_finished = 0;
301 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
302 if (retval)
303 --dev->open_count;
304 }
305 mutex_unlock(&dev->mtx);
306
307 exit_no_device:
308 dbg(2,"%s : leave, return value %d ", __FUNCTION__, retval);
309
310 return retval;
311 }
312
313 static int adu_release_internal(struct adu_device *dev)
314 {
315 int retval = 0;
316
317 dbg(2," %s : enter", __FUNCTION__);
318
319 /* decrement our usage count for the device */
320 --dev->open_count;
321 dbg(2," %s : open count %d", __FUNCTION__, dev->open_count);
322 if (dev->open_count <= 0) {
323 adu_abort_transfers(dev);
324 dev->open_count = 0;
325 }
326
327 dbg(2," %s : leave", __FUNCTION__);
328 return retval;
329 }
330
331 static int adu_release(struct inode *inode, struct file *file)
332 {
333 struct adu_device *dev = NULL;
334 int retval = 0;
335
336 dbg(2," %s : enter", __FUNCTION__);
337
338 if (file == NULL) {
339 dbg(1," %s : file is NULL", __FUNCTION__);
340 retval = -ENODEV;
341 goto exit;
342 }
343
344 dev = file->private_data;
345
346 if (dev == NULL) {
347 dbg(1," %s : object is NULL", __FUNCTION__);
348 retval = -ENODEV;
349 goto exit;
350 }
351
352 /* lock our device */
353 mutex_lock(&dev->mtx); /* not interruptible */
354
355 if (dev->open_count <= 0) {
356 dbg(1," %s : device not opened", __FUNCTION__);
357 retval = -ENODEV;
358 goto exit;
359 }
360
361 if (dev->udev == NULL) {
362 /* the device was unplugged before the file was released */
363 mutex_unlock(&dev->mtx);
364 adu_delete(dev);
365 dev = NULL;
366 } else {
367 /* do the work */
368 retval = adu_release_internal(dev);
369 }
370
371 exit:
372 if (dev)
373 mutex_unlock(&dev->mtx);
374 dbg(2," %s : leave, return value %d", __FUNCTION__, retval);
375 return retval;
376 }
377
378 static ssize_t adu_read(struct file *file, __user char *buffer, size_t count,
379 loff_t *ppos)
380 {
381 struct adu_device *dev;
382 size_t bytes_read = 0;
383 size_t bytes_to_read = count;
384 int i;
385 int retval = 0;
386 int timeout = 0;
387 int should_submit = 0;
388 unsigned long flags;
389 DECLARE_WAITQUEUE(wait, current);
390
391 dbg(2," %s : enter, count = %Zd, file=%p", __FUNCTION__, count, file);
392
393 dev = file->private_data;
394 dbg(2," %s : dev=%p", __FUNCTION__, dev);
395 /* lock this object */
396 if (mutex_lock_interruptible(&dev->mtx))
397 return -ERESTARTSYS;
398
399 /* verify that the device wasn't unplugged */
400 if (dev->udev == NULL || dev->minor == 0) {
401 retval = -ENODEV;
402 err("No device or device unplugged %d", retval);
403 goto exit;
404 }
405
406 /* verify that some data was requested */
407 if (count == 0) {
408 dbg(1," %s : read request of 0 bytes", __FUNCTION__);
409 goto exit;
410 }
411
412 timeout = COMMAND_TIMEOUT;
413 dbg(2," %s : about to start looping", __FUNCTION__);
414 while (bytes_to_read) {
415 int data_in_secondary = dev->secondary_tail - dev->secondary_head;
416 dbg(2," %s : while, data_in_secondary=%d, status=%d",
417 __FUNCTION__, data_in_secondary,
418 dev->interrupt_in_urb->status);
419
420 if (data_in_secondary) {
421 /* drain secondary buffer */
422 int amount = bytes_to_read < data_in_secondary ? bytes_to_read : data_in_secondary;
423 i = copy_to_user(buffer, dev->read_buffer_secondary+dev->secondary_head, amount);
424 if (i < 0) {
425 retval = -EFAULT;
426 goto exit;
427 }
428 dev->secondary_head += (amount - i);
429 bytes_read += (amount - i);
430 bytes_to_read -= (amount - i);
431 if (i) {
432 retval = bytes_read ? bytes_read : -EFAULT;
433 goto exit;
434 }
435 } else {
436 /* we check the primary buffer */
437 spin_lock_irqsave (&dev->buflock, flags);
438 if (dev->read_buffer_length) {
439 /* we secure access to the primary */
440 char *tmp;
441 dbg(2," %s : swap, read_buffer_length = %d",
442 __FUNCTION__, dev->read_buffer_length);
443 tmp = dev->read_buffer_secondary;
444 dev->read_buffer_secondary = dev->read_buffer_primary;
445 dev->read_buffer_primary = tmp;
446 dev->secondary_head = 0;
447 dev->secondary_tail = dev->read_buffer_length;
448 dev->read_buffer_length = 0;
449 spin_unlock_irqrestore(&dev->buflock, flags);
450 /* we have a free buffer so use it */
451 should_submit = 1;
452 } else {
453 /* even the primary was empty - we may need to do IO */
454 if (dev->interrupt_in_urb->status == -EINPROGRESS) {
455 /* somebody is doing IO */
456 spin_unlock_irqrestore(&dev->buflock, flags);
457 dbg(2," %s : submitted already", __FUNCTION__);
458 } else {
459 /* we must initiate input */
460 dbg(2," %s : initiate input", __FUNCTION__);
461 dev->read_urb_finished = 0;
462
463 usb_fill_int_urb(dev->interrupt_in_urb,dev->udev,
464 usb_rcvintpipe(dev->udev,
465 dev->interrupt_in_endpoint->bEndpointAddress),
466 dev->interrupt_in_buffer,
467 le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize),
468 adu_interrupt_in_callback,
469 dev,
470 dev->interrupt_in_endpoint->bInterval);
471 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_ATOMIC);
472 if (!retval) {
473 spin_unlock_irqrestore(&dev->buflock, flags);
474 dbg(2," %s : submitted OK", __FUNCTION__);
475 } else {
476 if (retval == -ENOMEM) {
477 retval = bytes_read ? bytes_read : -ENOMEM;
478 }
479 spin_unlock_irqrestore(&dev->buflock, flags);
480 dbg(2," %s : submit failed", __FUNCTION__);
481 goto exit;
482 }
483 }
484
485 /* we wait for I/O to complete */
486 set_current_state(TASK_INTERRUPTIBLE);
487 add_wait_queue(&dev->read_wait, &wait);
488 if (!dev->read_urb_finished)
489 timeout = schedule_timeout(COMMAND_TIMEOUT);
490 else
491 set_current_state(TASK_RUNNING);
492 remove_wait_queue(&dev->read_wait, &wait);
493
494 if (timeout <= 0) {
495 dbg(2," %s : timeout", __FUNCTION__);
496 retval = bytes_read ? bytes_read : -ETIMEDOUT;
497 goto exit;
498 }
499
500 if (signal_pending(current)) {
501 dbg(2," %s : signal pending", __FUNCTION__);
502 retval = bytes_read ? bytes_read : -EINTR;
503 goto exit;
504 }
505 }
506 }
507 }
508
509 retval = bytes_read;
510 /* if the primary buffer is empty then use it */
511 if (should_submit && !dev->interrupt_in_urb->status==-EINPROGRESS) {
512 usb_fill_int_urb(dev->interrupt_in_urb,dev->udev,
513 usb_rcvintpipe(dev->udev,
514 dev->interrupt_in_endpoint->bEndpointAddress),
515 dev->interrupt_in_buffer,
516 le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize),
517 adu_interrupt_in_callback,
518 dev,
519 dev->interrupt_in_endpoint->bInterval);
520 /* dev->interrupt_in_urb->transfer_flags |= URB_ASYNC_UNLINK; */
521 dev->read_urb_finished = 0;
522 usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
523 /* we ignore failure */
524 }
525
526 exit:
527 /* unlock the device */
528 mutex_unlock(&dev->mtx);
529
530 dbg(2," %s : leave, return value %d", __FUNCTION__, retval);
531 return retval;
532 }
533
534 static ssize_t adu_write(struct file *file, const __user char *buffer,
535 size_t count, loff_t *ppos)
536 {
537 struct adu_device *dev;
538 size_t bytes_written = 0;
539 size_t bytes_to_write;
540 size_t buffer_size;
541 int retval;
542 int timeout = 0;
543
544 dbg(2," %s : enter, count = %Zd", __FUNCTION__, count);
545
546 dev = file->private_data;
547
548 /* lock this object */
549 retval = mutex_lock_interruptible(&dev->mtx);
550 if (retval)
551 goto exit_nolock;
552
553 /* verify that the device wasn't unplugged */
554 if (dev->udev == NULL || dev->minor == 0) {
555 retval = -ENODEV;
556 err("No device or device unplugged %d", retval);
557 goto exit;
558 }
559
560 /* verify that we actually have some data to write */
561 if (count == 0) {
562 dbg(1," %s : write request of 0 bytes", __FUNCTION__);
563 goto exit;
564 }
565
566
567 while (count > 0) {
568 if (dev->interrupt_out_urb->status == -EINPROGRESS) {
569 timeout = COMMAND_TIMEOUT;
570
571 while (timeout > 0) {
572 if (signal_pending(current)) {
573 dbg(1," %s : interrupted", __FUNCTION__);
574 retval = -EINTR;
575 goto exit;
576 }
577 mutex_unlock(&dev->mtx);
578 timeout = interruptible_sleep_on_timeout(&dev->write_wait, timeout);
579 retval = mutex_lock_interruptible(&dev->mtx);
580 if (retval) {
581 retval = bytes_written ? bytes_written : retval;
582 goto exit_nolock;
583 }
584 if (timeout > 0) {
585 break;
586 }
587 dbg(1," %s : interrupted timeout: %d", __FUNCTION__, timeout);
588 }
589
590
591 dbg(1," %s : final timeout: %d", __FUNCTION__, timeout);
592
593 if (timeout == 0) {
594 dbg(1, "%s - command timed out.", __FUNCTION__);
595 retval = -ETIMEDOUT;
596 goto exit;
597 }
598
599 dbg(4," %s : in progress, count = %Zd", __FUNCTION__, count);
600
601 } else {
602 dbg(4," %s : sending, count = %Zd", __FUNCTION__, count);
603
604 /* write the data into interrupt_out_buffer from userspace */
605 buffer_size = le16_to_cpu(dev->interrupt_out_endpoint->wMaxPacketSize);
606 bytes_to_write = count > buffer_size ? buffer_size : count;
607 dbg(4," %s : buffer_size = %Zd, count = %Zd, bytes_to_write = %Zd",
608 __FUNCTION__, buffer_size, count, bytes_to_write);
609
610 if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write) != 0) {
611 retval = -EFAULT;
612 goto exit;
613 }
614
615 /* send off the urb */
616 usb_fill_int_urb(
617 dev->interrupt_out_urb,
618 dev->udev,
619 usb_sndintpipe(dev->udev, dev->interrupt_out_endpoint->bEndpointAddress),
620 dev->interrupt_out_buffer,
621 bytes_to_write,
622 adu_interrupt_out_callback,
623 dev,
624 dev->interrupt_in_endpoint->bInterval);
625 /* dev->interrupt_in_urb->transfer_flags |= URB_ASYNC_UNLINK; */
626 dev->interrupt_out_urb->actual_length = bytes_to_write;
627 retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL);
628 if (retval < 0) {
629 err("Couldn't submit interrupt_out_urb %d", retval);
630 goto exit;
631 }
632
633 buffer += bytes_to_write;
634 count -= bytes_to_write;
635
636 bytes_written += bytes_to_write;
637 }
638 }
639
640 retval = bytes_written;
641
642 exit:
643 /* unlock the device */
644 mutex_unlock(&dev->mtx);
645 exit_nolock:
646
647 dbg(2," %s : leave, return value %d", __FUNCTION__, retval);
648
649 return retval;
650 }
651
652 /* file operations needed when we register this driver */
653 static const struct file_operations adu_fops = {
654 .owner = THIS_MODULE,
655 .read = adu_read,
656 .write = adu_write,
657 .open = adu_open,
658 .release = adu_release,
659 };
660
661 /*
662 * usb class driver info in order to get a minor number from the usb core,
663 * and to have the device registered with devfs and the driver core
664 */
665 static struct usb_class_driver adu_class = {
666 .name = "usb/adutux%d",
667 .fops = &adu_fops,
668 .minor_base = ADU_MINOR_BASE,
669 };
670
671 /**
672 * adu_probe
673 *
674 * Called by the usb core when a new device is connected that it thinks
675 * this driver might be interested in.
676 */
677 static int adu_probe(struct usb_interface *interface,
678 const struct usb_device_id *id)
679 {
680 struct usb_device *udev = interface_to_usbdev(interface);
681 struct adu_device *dev = NULL;
682 struct usb_host_interface *iface_desc;
683 struct usb_endpoint_descriptor *endpoint;
684 int retval = -ENODEV;
685 int in_end_size;
686 int out_end_size;
687 int i;
688
689 dbg(2," %s : enter", __FUNCTION__);
690
691 if (udev == NULL) {
692 dev_err(&interface->dev, "udev is NULL.\n");
693 goto exit;
694 }
695
696 /* allocate memory for our device state and intialize it */
697 dev = kzalloc(sizeof(struct adu_device), GFP_KERNEL);
698 if (dev == NULL) {
699 dev_err(&interface->dev, "Out of memory\n");
700 retval = -ENOMEM;
701 goto exit;
702 }
703
704 mutex_init(&dev->mtx);
705 spin_lock_init(&dev->buflock);
706 dev->udev = udev;
707 init_waitqueue_head(&dev->read_wait);
708 init_waitqueue_head(&dev->write_wait);
709
710 iface_desc = &interface->altsetting[0];
711
712 /* set up the endpoint information */
713 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
714 endpoint = &iface_desc->endpoint[i].desc;
715
716 if (usb_endpoint_is_int_in(endpoint))
717 dev->interrupt_in_endpoint = endpoint;
718
719 if (usb_endpoint_is_int_out(endpoint))
720 dev->interrupt_out_endpoint = endpoint;
721 }
722 if (dev->interrupt_in_endpoint == NULL) {
723 dev_err(&interface->dev, "interrupt in endpoint not found\n");
724 goto error;
725 }
726 if (dev->interrupt_out_endpoint == NULL) {
727 dev_err(&interface->dev, "interrupt out endpoint not found\n");
728 goto error;
729 }
730
731 in_end_size = le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize);
732 out_end_size = le16_to_cpu(dev->interrupt_out_endpoint->wMaxPacketSize);
733
734 dev->read_buffer_primary = kmalloc((4 * in_end_size), GFP_KERNEL);
735 if (!dev->read_buffer_primary) {
736 dev_err(&interface->dev, "Couldn't allocate read_buffer_primary\n");
737 retval = -ENOMEM;
738 goto error;
739 }
740
741 /* debug code prime the buffer */
742 memset(dev->read_buffer_primary, 'a', in_end_size);
743 memset(dev->read_buffer_primary + in_end_size, 'b', in_end_size);
744 memset(dev->read_buffer_primary + (2 * in_end_size), 'c', in_end_size);
745 memset(dev->read_buffer_primary + (3 * in_end_size), 'd', in_end_size);
746
747 dev->read_buffer_secondary = kmalloc((4 * in_end_size), GFP_KERNEL);
748 if (!dev->read_buffer_secondary) {
749 dev_err(&interface->dev, "Couldn't allocate read_buffer_secondary\n");
750 retval = -ENOMEM;
751 goto error;
752 }
753
754 /* debug code prime the buffer */
755 memset(dev->read_buffer_secondary, 'e', in_end_size);
756 memset(dev->read_buffer_secondary + in_end_size, 'f', in_end_size);
757 memset(dev->read_buffer_secondary + (2 * in_end_size), 'g', in_end_size);
758 memset(dev->read_buffer_secondary + (3 * in_end_size), 'h', in_end_size);
759
760 dev->interrupt_in_buffer = kmalloc(in_end_size, GFP_KERNEL);
761 if (!dev->interrupt_in_buffer) {
762 dev_err(&interface->dev, "Couldn't allocate interrupt_in_buffer\n");
763 goto error;
764 }
765
766 /* debug code prime the buffer */
767 memset(dev->interrupt_in_buffer, 'i', in_end_size);
768
769 dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
770 if (!dev->interrupt_in_urb) {
771 dev_err(&interface->dev, "Couldn't allocate interrupt_in_urb\n");
772 goto error;
773 }
774 dev->interrupt_out_buffer = kmalloc(out_end_size, GFP_KERNEL);
775 if (!dev->interrupt_out_buffer) {
776 dev_err(&interface->dev, "Couldn't allocate interrupt_out_buffer\n");
777 goto error;
778 }
779 dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
780 if (!dev->interrupt_out_urb) {
781 dev_err(&interface->dev, "Couldn't allocate interrupt_out_urb\n");
782 goto error;
783 }
784
785 if (!usb_string(udev, udev->descriptor.iSerialNumber, dev->serial_number,
786 sizeof(dev->serial_number))) {
787 dev_err(&interface->dev, "Could not retrieve serial number\n");
788 goto error;
789 }
790 dbg(2," %s : serial_number=%s", __FUNCTION__, dev->serial_number);
791
792 /* we can register the device now, as it is ready */
793 usb_set_intfdata(interface, dev);
794
795 retval = usb_register_dev(interface, &adu_class);
796
797 if (retval) {
798 /* something prevented us from registering this driver */
799 dev_err(&interface->dev, "Not able to get a minor for this device.\n");
800 usb_set_intfdata(interface, NULL);
801 goto error;
802 }
803
804 dev->minor = interface->minor;
805
806 /* let the user know what node this device is now attached to */
807 dev_info(&interface->dev, "ADU%d %s now attached to /dev/usb/adutux%d",
808 udev->descriptor.idProduct, dev->serial_number,
809 (dev->minor - ADU_MINOR_BASE));
810 exit:
811 dbg(2," %s : leave, return value %p (dev)", __FUNCTION__, dev);
812
813 return retval;
814
815 error:
816 adu_delete(dev);
817 return retval;
818 }
819
820 /**
821 * adu_disconnect
822 *
823 * Called by the usb core when the device is removed from the system.
824 */
825 static void adu_disconnect(struct usb_interface *interface)
826 {
827 struct adu_device *dev;
828 int minor;
829
830 dbg(2," %s : enter", __FUNCTION__);
831
832 dev = usb_get_intfdata(interface);
833 usb_set_intfdata(interface, NULL);
834
835 minor = dev->minor;
836
837 /* give back our minor */
838 usb_deregister_dev(interface, &adu_class);
839 dev->minor = 0;
840
841 mutex_lock(&dev->mtx); /* not interruptible */
842
843 /* if the device is not opened, then we clean up right now */
844 dbg(2," %s : open count %d", __FUNCTION__, dev->open_count);
845 if (!dev->open_count) {
846 mutex_unlock(&dev->mtx);
847 adu_delete(dev);
848 } else {
849 dev->udev = NULL;
850 mutex_unlock(&dev->mtx);
851 }
852
853 dev_info(&interface->dev, "ADU device adutux%d now disconnected",
854 (minor - ADU_MINOR_BASE));
855
856 dbg(2," %s : leave", __FUNCTION__);
857 }
858
859 /* usb specific object needed to register this driver with the usb subsystem */
860 static struct usb_driver adu_driver = {
861 .name = "adutux",
862 .probe = adu_probe,
863 .disconnect = adu_disconnect,
864 .id_table = device_table,
865 };
866
867 static int __init adu_init(void)
868 {
869 int result;
870
871 dbg(2," %s : enter", __FUNCTION__);
872
873 /* register this driver with the USB subsystem */
874 result = usb_register(&adu_driver);
875 if (result < 0) {
876 err("usb_register failed for the "__FILE__" driver. "
877 "Error number %d", result);
878 goto exit;
879 }
880
881 info("adutux " DRIVER_DESC " " DRIVER_VERSION);
882 info("adutux is an experimental driver. Use at your own risk");
883
884 exit:
885 dbg(2," %s : leave, return value %d", __FUNCTION__, result);
886
887 return result;
888 }
889
890 static void __exit adu_exit(void)
891 {
892 dbg(2," %s : enter", __FUNCTION__);
893 /* deregister this driver with the USB subsystem */
894 usb_deregister(&adu_driver);
895 dbg(2," %s : leave", __FUNCTION__);
896 }
897
898 module_init(adu_init);
899 module_exit(adu_exit);
900
901 MODULE_AUTHOR(DRIVER_AUTHOR);
902 MODULE_DESCRIPTION(DRIVER_DESC);
903 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree