2 * Frontier Designs Tranzport driver
4 * Copyright (C) 2007 Michael Taht (m@taht.net)
6 * Based on the usbled driver and ldusb drivers by
8 * Copyright (C) 2004 Greg Kroah-Hartman (greg@kroah.com)
9 * Copyright (C) 2005 Michael Hund <mhund@ld-didactic.de>
11 * The ldusb driver was, in turn, derived from Lego USB Tower driver
12 * Copyright (C) 2003 David Glance <advidgsf@sourceforge.net>
13 * 2001-2004 Juergen Stuber <starblue@users.sourceforge.net>
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License as
17 * published by the Free Software Foundation, version 2.
22 * This driver uses a ring buffer for time critical reading of
23 * interrupt in reports and provides read and write methods for
24 * raw interrupt reports.
27 /* Note: this currently uses a dumb ringbuffer for reads and writes.
28 * A more optimal driver would cache and kill off outstanding urbs that are
29 * now invalid, and ignore ones that already were in the queue but valid
30 * as we only have 17 commands for the tranzport. In particular this is
31 * key for getting lights to flash in time as otherwise many commands
32 * can be buffered up before the light change makes it to the interface.
35 #include <linux/kernel.h>
36 #include <linux/errno.h>
37 #include <linux/slab.h>
38 #include <linux/module.h>
39 #include <linux/mutex.h>
41 #include <linux/uaccess.h>
42 #include <linux/input.h>
43 #include <linux/usb.h>
44 #include <linux/poll.h>
46 /* Define these values to match your devices */
47 #define VENDOR_ID 0x165b
48 #define PRODUCT_ID 0x8101
50 #ifdef CONFIG_USB_DYNAMIC_MINORS
51 #define USB_TRANZPORT_MINOR_BASE 0
52 #else /* FIXME 177- is the another driver's minor - apply for a minor soon */
53 #define USB_TRANZPORT_MINOR_BASE 177
56 /* table of devices that work with this driver */
57 static const struct usb_device_id usb_tranzport_table[] = {
58 {USB_DEVICE(VENDOR_ID, PRODUCT_ID)},
59 {} /* Terminating entry */
62 MODULE_DEVICE_TABLE(usb, usb_tranzport_table);
63 MODULE_VERSION("0.35");
64 MODULE_AUTHOR("Mike Taht <m@taht.net>");
65 MODULE_DESCRIPTION("Tranzport USB Driver");
66 MODULE_LICENSE("GPL");
67 MODULE_SUPPORTED_DEVICE("Frontier Designs Tranzport Control Surface");
69 #define SUPPRESS_EXTRA_OFFLINE_EVENTS 1
70 #define COMPRESS_WHEEL_EVENTS 1
71 #define BUFFERED_READS 1
72 #define RING_BUFFER_SIZE 1000
73 #define WRITE_BUFFER_SIZE 34
74 #define TRANZPORT_USB_TIMEOUT 10
75 #define TRANZPORT_DEBUG 0
77 static int debug = TRANZPORT_DEBUG;
79 /* Use our own dbg macro */
80 #define dbg_info(dev, format, arg...) do \
81 { if (debug) dev_info(dev , format , ## arg); } while (0)
83 /* Module parameters */
85 module_param(debug, int, S_IRUGO | S_IWUSR);
86 MODULE_PARM_DESC(debug, "Debug enabled or not");
89 * All interrupt in transfers are collected in a ring buffer to
90 * avoid racing conditions and get better performance of the driver.
93 static int ring_buffer_size = RING_BUFFER_SIZE;
95 module_param(ring_buffer_size, int, S_IRUGO);
96 MODULE_PARM_DESC(ring_buffer_size, "Read ring buffer size in reports");
99 * The write_buffer can one day contain more than one interrupt out transfer.
101 static int write_buffer_size = WRITE_BUFFER_SIZE;
102 module_param(write_buffer_size, int, S_IRUGO);
103 MODULE_PARM_DESC(write_buffer_size, "Write buffer size");
106 * Increase the interval for debugging purposes.
107 * or set to 1 to use the standard interval from the endpoint descriptors.
110 static int min_interrupt_in_interval = TRANZPORT_USB_TIMEOUT;
111 module_param(min_interrupt_in_interval, int, 0);
112 MODULE_PARM_DESC(min_interrupt_in_interval,
113 "Minimum interrupt in interval in ms");
115 static int min_interrupt_out_interval = TRANZPORT_USB_TIMEOUT;
116 module_param(min_interrupt_out_interval, int, 0);
117 MODULE_PARM_DESC(min_interrupt_out_interval,
118 "Minimum interrupt out interval in ms");
120 struct tranzport_cmd {
121 unsigned char cmd[8];
124 /* Structure to hold all of our device specific stuff */
126 struct usb_tranzport {
127 struct mutex mtx; /* locks this structure */
128 struct usb_interface *intf; /* save off the usb interface pointer */
129 int open_count; /* number of times this port opened */
130 struct tranzport_cmd (*ring_buffer)[RING_BUFFER_SIZE];
131 unsigned int ring_head;
132 unsigned int ring_tail;
133 wait_queue_head_t read_wait;
134 wait_queue_head_t write_wait;
135 unsigned char *interrupt_in_buffer;
136 struct usb_endpoint_descriptor *interrupt_in_endpoint;
137 struct urb *interrupt_in_urb;
138 int interrupt_in_interval;
139 size_t interrupt_in_endpoint_size;
140 int interrupt_in_running;
141 int interrupt_in_done;
142 char *interrupt_out_buffer;
143 struct usb_endpoint_descriptor *interrupt_out_endpoint;
144 struct urb *interrupt_out_urb;
145 int interrupt_out_interval;
146 size_t interrupt_out_endpoint_size;
147 int interrupt_out_busy;
151 unsigned char enable; /* 0 if disabled 1 if enabled */
152 unsigned char offline; /* if the device is out of range or asleep */
153 unsigned char compress_wheel; /* flag to compress wheel events */
156 /* prevent races between open() and disconnect() */
157 static DEFINE_MUTEX(disconnect_mutex);
159 static struct usb_driver usb_tranzport_driver;
162 * usb_tranzport_abort_transfers
163 * aborts transfers and frees associated data structures
165 static void usb_tranzport_abort_transfers(struct usb_tranzport *dev)
167 /* shutdown transfer */
168 if (dev->interrupt_in_running) {
169 dev->interrupt_in_running = 0;
171 usb_kill_urb(dev->interrupt_in_urb);
173 if (dev->interrupt_out_busy)
175 usb_kill_urb(dev->interrupt_out_urb);
178 #define show_int(value) \
179 static ssize_t value##_show(struct device *dev, \
180 struct device_attribute *attr, char *buf) \
182 struct usb_interface *intf = to_usb_interface(dev); \
183 struct usb_tranzport *t = usb_get_intfdata(intf); \
184 return sprintf(buf, "%d\n", t->value); \
186 static DEVICE_ATTR_RO(value)
188 #define show_set_int(value) \
189 static ssize_t value##_show(struct device *dev, \
190 struct device_attribute *attr, char *buf) \
192 struct usb_interface *intf = to_usb_interface(dev); \
193 struct usb_tranzport *t = usb_get_intfdata(intf); \
194 return sprintf(buf, "%d\n", t->value); \
196 static ssize_t value##_store(struct device *dev, \
197 struct device_attribute *attr, \
198 const char *buf, size_t count) \
200 struct usb_interface *intf = to_usb_interface(dev); \
201 struct usb_tranzport *t = usb_get_intfdata(intf); \
202 unsigned long temp; \
203 if (kstrtoul(buf, 10, &temp)) \
208 static DEVICE_ATTR_RW(value)
212 show_set_int(compress_wheel);
215 * usb_tranzport_delete
217 static void usb_tranzport_delete(struct usb_tranzport *dev)
219 usb_tranzport_abort_transfers(dev);
220 if (dev->intf != NULL) {
221 device_remove_file(&dev->intf->dev, &dev_attr_enable);
222 device_remove_file(&dev->intf->dev, &dev_attr_offline);
223 device_remove_file(&dev->intf->dev, &dev_attr_compress_wheel);
226 /* free data structures */
227 usb_free_urb(dev->interrupt_in_urb);
228 usb_free_urb(dev->interrupt_out_urb);
229 kfree(dev->ring_buffer);
230 kfree(dev->interrupt_in_buffer);
231 kfree(dev->interrupt_out_buffer);
236 * usb_tranzport_interrupt_in_callback
239 static void usb_tranzport_interrupt_in_callback(struct urb *urb)
241 struct usb_tranzport *dev = urb->context;
242 unsigned int next_ring_head;
246 if (urb->status == -ENOENT ||
247 urb->status == -ECONNRESET ||
248 urb->status == -ESHUTDOWN) {
251 dbg_info(&dev->intf->dev,
252 "%s: nonzero status received: %d\n",
253 __func__, urb->status);
254 goto resubmit; /* maybe we can recover */
258 if (urb->actual_length != 8) {
259 dev_warn(&dev->intf->dev,
260 "Urb length was %d bytes!! Do something intelligent\n",
263 dbg_info(&dev->intf->dev,
264 "%s: received: %02x%02x%02x%02x%02x%02x%02x%02x\n",
265 __func__, dev->interrupt_in_buffer[0],
266 dev->interrupt_in_buffer[1],
267 dev->interrupt_in_buffer[2],
268 dev->interrupt_in_buffer[3],
269 dev->interrupt_in_buffer[4],
270 dev->interrupt_in_buffer[5],
271 dev->interrupt_in_buffer[6],
272 dev->interrupt_in_buffer[7]);
273 #if SUPPRESS_EXTRA_OFFLINE_EVENTS
274 if (dev->offline == 2 && dev->interrupt_in_buffer[1] == 0xff)
276 if (dev->offline == 1 && dev->interrupt_in_buffer[1] == 0xff) {
281 /* Always pass one offline event up the stack */
282 if (dev->offline > 0 && dev->interrupt_in_buffer[1] != 0xff)
284 if (dev->offline == 0 && dev->interrupt_in_buffer[1] == 0xff)
287 #endif /* SUPPRESS_EXTRA_OFFLINE_EVENTS */
288 dbg_info(&dev->intf->dev, "%s: head, tail are %x, %x\n",
289 __func__, dev->ring_head, dev->ring_tail);
291 next_ring_head = (dev->ring_head + 1) % ring_buffer_size;
293 if (next_ring_head != dev->ring_tail) {
294 memcpy(&((*dev->ring_buffer)[dev->ring_head]),
295 dev->interrupt_in_buffer, urb->actual_length);
296 dev->ring_head = next_ring_head;
298 memset(dev->interrupt_in_buffer, 0, urb->actual_length);
300 dev_warn(&dev->intf->dev,
301 "Ring buffer overflow, %d bytes dropped\n",
303 memset(dev->interrupt_in_buffer, 0, urb->actual_length);
308 /* resubmit if we're still running */
309 if (dev->interrupt_in_running && dev->intf) {
310 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_ATOMIC);
312 dev_err(&dev->intf->dev,
313 "usb_submit_urb failed (%d)\n", retval);
317 dev->interrupt_in_done = 1;
318 wake_up_interruptible(&dev->read_wait);
322 * usb_tranzport_interrupt_out_callback
324 static void usb_tranzport_interrupt_out_callback(struct urb *urb)
326 struct usb_tranzport *dev = urb->context;
327 /* sync/async unlink faults aren't errors */
328 if (urb->status && !(urb->status == -ENOENT ||
329 urb->status == -ECONNRESET ||
330 urb->status == -ESHUTDOWN))
331 dbg_info(&dev->intf->dev,
332 "%s - nonzero write interrupt status received: %d\n",
333 __func__, urb->status);
335 dev->interrupt_out_busy = 0;
336 wake_up_interruptible(&dev->write_wait);
341 static int usb_tranzport_open(struct inode *inode, struct file *file)
343 struct usb_tranzport *dev;
346 struct usb_interface *interface;
348 nonseekable_open(inode, file);
349 subminor = iminor(inode);
351 mutex_lock(&disconnect_mutex);
353 interface = usb_find_interface(&usb_tranzport_driver, subminor);
356 pr_err("%s - error, can't find device for minor %d\n",
359 goto unlock_disconnect_exit;
362 dev = usb_get_intfdata(interface);
366 goto unlock_disconnect_exit;
369 /* lock this device */
370 if (mutex_lock_interruptible(&dev->mtx)) {
371 retval = -ERESTARTSYS;
372 goto unlock_disconnect_exit;
375 /* allow opening only once */
376 if (dev->open_count) {
382 /* initialize in direction */
385 usb_fill_int_urb(dev->interrupt_in_urb,
386 interface_to_usbdev(interface),
387 usb_rcvintpipe(interface_to_usbdev(interface),
388 dev->interrupt_in_endpoint->
390 dev->interrupt_in_buffer,
391 dev->interrupt_in_endpoint_size,
392 usb_tranzport_interrupt_in_callback, dev,
393 dev->interrupt_in_interval);
395 dev->interrupt_in_running = 1;
396 dev->interrupt_in_done = 0;
399 dev->compress_wheel = 1;
401 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
403 dev_err(&interface->dev,
404 "Couldn't submit interrupt_in_urb %d\n", retval);
405 dev->interrupt_in_running = 0;
410 /* save device in the file's private structure */
411 file->private_data = dev;
414 mutex_unlock(&dev->mtx);
416 unlock_disconnect_exit:
417 mutex_unlock(&disconnect_mutex);
423 * usb_tranzport_release
425 static int usb_tranzport_release(struct inode *inode, struct file *file)
427 struct usb_tranzport *dev;
430 dev = file->private_data;
437 if (mutex_lock_interruptible(&dev->mtx)) {
438 retval = -ERESTARTSYS;
442 if (dev->open_count != 1) {
447 if (dev->intf == NULL) {
448 /* the device was unplugged before the file was released */
449 mutex_unlock(&dev->mtx);
450 /* unlock here as usb_tranzport_delete frees dev */
451 usb_tranzport_delete(dev);
456 /* wait until write transfer is finished */
457 if (dev->interrupt_out_busy)
458 wait_event_interruptible_timeout(dev->write_wait,
459 !dev->interrupt_out_busy,
461 usb_tranzport_abort_transfers(dev);
465 mutex_unlock(&dev->mtx);
474 static unsigned int usb_tranzport_poll(struct file *file, poll_table *wait)
476 struct usb_tranzport *dev;
477 unsigned int mask = 0;
478 dev = file->private_data;
479 poll_wait(file, &dev->read_wait, wait);
480 poll_wait(file, &dev->write_wait, wait);
481 if (dev->ring_head != dev->ring_tail)
482 mask |= POLLIN | POLLRDNORM;
483 if (!dev->interrupt_out_busy)
484 mask |= POLLOUT | POLLWRNORM;
491 static ssize_t usb_tranzport_read(struct file *file, char __user *buffer,
492 size_t count, loff_t *ppos)
494 struct usb_tranzport *dev;
499 #if COMPRESS_WHEEL_EVENTS
500 signed char oldwheel;
501 signed char newwheel;
506 /* do I have such a thing as a null event? */
508 dev = file->private_data;
510 /* verify that we actually have some data to read */
514 /* lock this object */
515 if (mutex_lock_interruptible(&dev->mtx)) {
516 retval = -ERESTARTSYS;
520 /* verify that the device wasn't unplugged */
521 if (dev->intf == NULL) {
523 pr_err("%s: No device or device unplugged %d\n",
528 while (dev->ring_head == dev->ring_tail) {
530 if (file->f_flags & O_NONBLOCK) {
534 /* tiny race - FIXME: make atomic? */
535 /* atomic_cmp_exchange(&dev->interrupt_in_done,0,0); */
536 dev->interrupt_in_done = 0;
537 retval = wait_event_interruptible(dev->read_wait,
538 dev->interrupt_in_done);
543 dbg_info(&dev->intf->dev,
544 "%s: copying to userspace: %02x%02x%02x%02x%02x%02x%02x%02x\n",
546 (*dev->ring_buffer)[dev->ring_tail].cmd[0],
547 (*dev->ring_buffer)[dev->ring_tail].cmd[1],
548 (*dev->ring_buffer)[dev->ring_tail].cmd[2],
549 (*dev->ring_buffer)[dev->ring_tail].cmd[3],
550 (*dev->ring_buffer)[dev->ring_tail].cmd[4],
551 (*dev->ring_buffer)[dev->ring_tail].cmd[5],
552 (*dev->ring_buffer)[dev->ring_tail].cmd[6],
553 (*dev->ring_buffer)[dev->ring_tail].cmd[7]);
557 while ((c < count) && (dev->ring_tail != dev->ring_head)) {
559 #if COMPRESS_WHEEL_EVENTS
560 next_tail = (dev->ring_tail+1) % ring_buffer_size;
561 if (dev->compress_wheel)
563 while (dev->ring_head != next_tail && cancompress == 1) {
564 newwheel = (*dev->ring_buffer)[next_tail].cmd[6];
565 oldwheel = (*dev->ring_buffer)[dev->ring_tail].cmd[6];
566 /* if both are wheel events, and
567 * no buttons have changes (FIXME, do I have to check?),
568 * and we are the same sign, we can compress +- 7F
570 dbg_info(&dev->intf->dev,
571 "%s: trying to compress: %02x%02x%02x%02x%02x%02x%02x%02x\n",
573 (*dev->ring_buffer)[dev->ring_tail].cmd[0],
574 (*dev->ring_buffer)[dev->ring_tail].cmd[1],
575 (*dev->ring_buffer)[dev->ring_tail].cmd[2],
576 (*dev->ring_buffer)[dev->ring_tail].cmd[3],
577 (*dev->ring_buffer)[dev->ring_tail].cmd[4],
578 (*dev->ring_buffer)[dev->ring_tail].cmd[5],
579 (*dev->ring_buffer)[dev->ring_tail].cmd[6],
580 (*dev->ring_buffer)[dev->ring_tail].cmd[7]);
582 if (((*dev->ring_buffer)[dev->ring_tail].cmd[6] != 0 &&
583 (*dev->ring_buffer)[next_tail].cmd[6] != 0) &&
584 ((newwheel > 0 && oldwheel > 0) ||
585 (newwheel < 0 && oldwheel < 0)) &&
586 ((*dev->ring_buffer)[dev->ring_tail].cmd[2] ==
587 (*dev->ring_buffer)[next_tail].cmd[2]) &&
588 ((*dev->ring_buffer)[dev->ring_tail].cmd[3] ==
589 (*dev->ring_buffer)[next_tail].cmd[3]) &&
590 ((*dev->ring_buffer)[dev->ring_tail].cmd[4] ==
591 (*dev->ring_buffer)[next_tail].cmd[4]) &&
592 ((*dev->ring_buffer)[dev->ring_tail].cmd[5] ==
593 (*dev->ring_buffer)[next_tail].cmd[5])) {
594 dbg_info(&dev->intf->dev,
595 "%s: should compress: "
596 "%02x%02x%02x%02x%02x%02x%02x%02x\n",
598 (*dev->ring_buffer)[dev->ring_tail].
600 (*dev->ring_buffer)[dev->ring_tail].
602 (*dev->ring_buffer)[dev->ring_tail].
604 (*dev->ring_buffer)[dev->ring_tail].
606 (*dev->ring_buffer)[dev->ring_tail].
608 (*dev->ring_buffer)[dev->ring_tail].
610 (*dev->ring_buffer)[dev->ring_tail].
612 (*dev->ring_buffer)[dev->ring_tail].
614 newwheel += oldwheel;
615 if (oldwheel > 0 && !(newwheel > 0)) {
619 if (oldwheel < 0 && !(newwheel < 0)) {
624 (*dev->ring_buffer)[next_tail].cmd[6] =
626 dev->ring_tail = next_tail;
628 (dev->ring_tail + 1) % ring_buffer_size;
633 #endif /* COMPRESS_WHEEL_EVENTS */
636 &(*dev->ring_buffer)[dev->ring_tail], 8)) {
640 dev->ring_tail = (dev->ring_tail + 1) % ring_buffer_size;
642 dbg_info(&dev->intf->dev,
643 "%s: head, tail are %x, %x\n",
644 __func__, dev->ring_head, dev->ring_tail);
649 /* if (copy_to_user(buffer, &(*dev->ring_buffer)[dev->ring_tail], 8)) { */
654 dev->ring_tail = (dev->ring_tail + 1) % ring_buffer_size;
655 dbg_info(&dev->intf->dev, "%s: head, tail are %x, %x\n",
656 __func__, dev->ring_head, dev->ring_tail);
659 #endif /* BUFFERED_READS */
662 /* unlock the device */
663 mutex_unlock(&dev->mtx);
670 * usb_tranzport_write
672 static ssize_t usb_tranzport_write(struct file *file,
673 const char __user *buffer, size_t count,
676 struct usb_tranzport *dev;
677 size_t bytes_to_write;
680 dev = file->private_data;
682 /* verify that we actually have some data to write */
686 /* lock this object */
687 if (mutex_lock_interruptible(&dev->mtx)) {
688 retval = -ERESTARTSYS;
691 /* verify that the device wasn't unplugged */
692 if (dev->intf == NULL) {
694 pr_err("%s: No device or device unplugged %d\n",
699 /* wait until previous transfer is finished */
700 if (dev->interrupt_out_busy) {
701 if (file->f_flags & O_NONBLOCK) {
705 retval = wait_event_interruptible(dev->write_wait,
706 !dev->interrupt_out_busy);
711 /* write the data into interrupt_out_buffer from userspace */
712 bytes_to_write = min(count,
714 dev->interrupt_out_endpoint_size);
715 if (bytes_to_write < count)
716 dev_warn(&dev->intf->dev,
717 "Write buffer overflow, %zd bytes dropped\n",
718 count - bytes_to_write);
720 dbg_info(&dev->intf->dev,
721 "%s: count = %zd, bytes_to_write = %zd\n", __func__,
722 count, bytes_to_write);
724 if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write)) {
729 if (dev->interrupt_out_endpoint == NULL) {
730 dev_err(&dev->intf->dev, "Endpoint should not be null!\n");
734 /* send off the urb */
735 usb_fill_int_urb(dev->interrupt_out_urb,
736 interface_to_usbdev(dev->intf),
737 usb_sndintpipe(interface_to_usbdev(dev->intf),
738 dev->interrupt_out_endpoint->
740 dev->interrupt_out_buffer, bytes_to_write,
741 usb_tranzport_interrupt_out_callback, dev,
742 dev->interrupt_out_interval);
744 dev->interrupt_out_busy = 1;
747 retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL);
749 dev->interrupt_out_busy = 0;
750 dev_err(&dev->intf->dev,
751 "Couldn't submit interrupt_out_urb %d\n", retval);
754 retval = bytes_to_write;
757 /* unlock the device */
758 mutex_unlock(&dev->mtx);
764 /* file operations needed when we register this driver */
765 static const struct file_operations usb_tranzport_fops = {
766 .owner = THIS_MODULE,
767 .read = usb_tranzport_read,
768 .write = usb_tranzport_write,
769 .open = usb_tranzport_open,
770 .release = usb_tranzport_release,
771 .poll = usb_tranzport_poll,
776 * usb class driver info in order to get a minor number from the usb core,
777 * and to have the device registered with the driver core
779 static struct usb_class_driver usb_tranzport_class = {
780 .name = "tranzport%d",
781 .fops = &usb_tranzport_fops,
782 .minor_base = USB_TRANZPORT_MINOR_BASE,
786 * usb_tranzport_probe
788 * Called by the usb core when a new device is connected that it thinks
789 * this driver might be interested in.
791 static int usb_tranzport_probe(struct usb_interface *intf,
792 const struct usb_device_id *id) {
793 struct usb_device *udev = interface_to_usbdev(intf);
794 struct usb_tranzport *dev = NULL;
795 struct usb_host_interface *iface_desc;
796 struct usb_endpoint_descriptor *endpoint;
799 int retval = -ENOMEM;
801 /* allocate memory for our device state and initialize it */
803 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
807 mutex_init(&dev->mtx);
809 init_waitqueue_head(&dev->read_wait);
810 init_waitqueue_head(&dev->write_wait);
812 iface_desc = intf->cur_altsetting;
814 /* set up the endpoint information */
815 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
816 endpoint = &iface_desc->endpoint[i].desc;
818 if (usb_endpoint_is_int_in(endpoint))
819 dev->interrupt_in_endpoint = endpoint;
821 if (usb_endpoint_is_int_out(endpoint))
822 dev->interrupt_out_endpoint = endpoint;
824 if (dev->interrupt_in_endpoint == NULL) {
825 dev_err(&intf->dev, "Interrupt in endpoint not found\n");
828 if (dev->interrupt_out_endpoint == NULL)
830 "Interrupt out endpoint not found (using control endpoint instead)\n");
832 dev->interrupt_in_endpoint_size =
833 le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize);
835 if (dev->interrupt_in_endpoint_size != 8)
836 dev_warn(&intf->dev, "Interrupt in endpoint size is not 8!\n");
838 if (ring_buffer_size == 0)
839 ring_buffer_size = RING_BUFFER_SIZE;
840 true_size = min(ring_buffer_size, RING_BUFFER_SIZE);
843 * FIXME - there are more usb_alloc routines for dma correctness.
848 kmalloc((true_size * sizeof(struct tranzport_cmd)) + 8, GFP_KERNEL);
849 if (!dev->ring_buffer)
852 dev->interrupt_in_buffer =
853 kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL);
854 if (!dev->interrupt_in_buffer)
857 dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
858 if (!dev->interrupt_in_urb) {
859 dev_err(&intf->dev, "Couldn't allocate interrupt_in_urb\n");
862 dev->interrupt_out_endpoint_size =
863 dev->interrupt_out_endpoint ?
864 le16_to_cpu(dev->interrupt_out_endpoint->wMaxPacketSize) :
865 udev->descriptor.bMaxPacketSize0;
867 if (dev->interrupt_out_endpoint_size != 8)
869 "Interrupt out endpoint size is not 8!)\n");
871 dev->interrupt_out_buffer =
872 kmalloc_array(write_buffer_size,
873 dev->interrupt_out_endpoint_size, GFP_KERNEL);
874 if (!dev->interrupt_out_buffer)
877 dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
878 if (!dev->interrupt_out_urb) {
879 dev_err(&intf->dev, "Couldn't allocate interrupt_out_urb\n");
882 dev->interrupt_in_interval =
883 min_interrupt_in_interval >
884 dev->interrupt_in_endpoint->bInterval ? min_interrupt_in_interval
885 : dev->interrupt_in_endpoint->bInterval;
887 if (dev->interrupt_out_endpoint) {
888 dev->interrupt_out_interval =
889 min_interrupt_out_interval >
890 dev->interrupt_out_endpoint->bInterval ?
891 min_interrupt_out_interval :
892 dev->interrupt_out_endpoint->bInterval;
895 /* we can register the device now, as it is ready */
896 usb_set_intfdata(intf, dev);
898 retval = usb_register_dev(intf, &usb_tranzport_class);
900 /* something prevented us from registering this driver */
902 "Not able to get a minor for this device.\n");
903 usb_set_intfdata(intf, NULL);
907 retval = device_create_file(&intf->dev, &dev_attr_compress_wheel);
910 retval = device_create_file(&intf->dev, &dev_attr_enable);
913 retval = device_create_file(&intf->dev, &dev_attr_offline);
917 /* let the user know what node this device is now attached to */
919 "Tranzport Device #%d now attached to major %d minor %d\n",
920 (intf->minor - USB_TRANZPORT_MINOR_BASE), USB_MAJOR,
927 usb_tranzport_delete(dev);
932 * usb_tranzport_disconnect
934 * Called by the usb core when the device is removed from the system.
936 static void usb_tranzport_disconnect(struct usb_interface *intf)
938 struct usb_tranzport *dev;
940 mutex_lock(&disconnect_mutex);
941 dev = usb_get_intfdata(intf);
942 usb_set_intfdata(intf, NULL);
943 mutex_lock(&dev->mtx);
945 /* give back our minor */
946 usb_deregister_dev(intf, &usb_tranzport_class);
948 /* if the device is not opened, then we clean up right now */
949 if (!dev->open_count) {
950 mutex_unlock(&dev->mtx);
951 usb_tranzport_delete(dev);
954 mutex_unlock(&dev->mtx);
957 mutex_unlock(&disconnect_mutex);
959 dev_info(&intf->dev, "Tranzport Surface #%d now disconnected\n",
960 (minor - USB_TRANZPORT_MINOR_BASE));
963 /* usb specific object needed to register this driver with the usb subsystem */
964 static struct usb_driver usb_tranzport_driver = {
966 .probe = usb_tranzport_probe,
967 .disconnect = usb_tranzport_disconnect,
968 .id_table = usb_tranzport_table,
971 module_usb_driver(usb_tranzport_driver);