aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/usb/misc/ldusb.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/usb/misc/ldusb.c')
-rw-r--r--drivers/usb/misc/ldusb.c794
1 files changed, 794 insertions, 0 deletions
diff --git a/drivers/usb/misc/ldusb.c b/drivers/usb/misc/ldusb.c
new file mode 100644
index 000000000000..66ec88354b93
--- /dev/null
+++ b/drivers/usb/misc/ldusb.c
@@ -0,0 +1,794 @@
1/**
2 * Generic USB driver for report based interrupt in/out devices
3 * like LD Didactic's USB devices. LD Didactic's USB devices are
4 * HID devices which do not use HID report definitons (they use
5 * raw interrupt in and our reports only for communication).
6 *
7 * This driver uses a ring buffer for time critical reading of
8 * interrupt in reports and provides read and write methods for
9 * raw interrupt reports (similar to the Windows HID driver).
10 * Devices based on the book USB COMPLETE by Jan Axelson may need
11 * such a compatibility to the Windows HID driver.
12 *
13 * Copyright (C) 2005 Michael Hund <mhund@ld-didactic.de>
14 *
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; either version 2 of
18 * the License, or (at your option) any later version.
19 *
20 * Derived from Lego USB Tower driver
21 * Copyright (C) 2003 David Glance <advidgsf@sourceforge.net>
22 * 2001-2004 Juergen Stuber <starblue@users.sourceforge.net>
23 *
24 * V0.1 (mh) Initial version
25 * V0.11 (mh) Added raw support for HID 1.0 devices (no interrupt out endpoint)
26 */
27
28#include <linux/config.h>
29#include <linux/kernel.h>
30#include <linux/errno.h>
31#include <linux/init.h>
32#include <linux/slab.h>
33#include <linux/module.h>
34
35#include <asm/uaccess.h>
36#include <linux/input.h>
37#include <linux/usb.h>
38#include <linux/poll.h>
39
40/* Define these values to match your devices */
41#define USB_VENDOR_ID_LD 0x0f11 /* USB Vendor ID of LD Didactic GmbH */
42#define USB_DEVICE_ID_CASSY 0x1000 /* USB Product ID for all CASSY-S modules */
43#define USB_DEVICE_ID_POCKETCASSY 0x1010 /* USB Product ID for Pocket-CASSY */
44#define USB_DEVICE_ID_MOBILECASSY 0x1020 /* USB Product ID for Mobile-CASSY */
45#define USB_DEVICE_ID_JWM 0x1080 /* USB Product ID for Joule and Wattmeter */
46#define USB_DEVICE_ID_DMMP 0x1081 /* USB Product ID for Digital Multimeter P (reserved) */
47#define USB_DEVICE_ID_UMIP 0x1090 /* USB Product ID for UMI P */
48#define USB_DEVICE_ID_VIDEOCOM 0x1200 /* USB Product ID for VideoCom */
49#define USB_DEVICE_ID_COM3LAB 0x2000 /* USB Product ID for COM3LAB */
50#define USB_DEVICE_ID_TELEPORT 0x2010 /* USB Product ID for Terminal Adapter */
51#define USB_DEVICE_ID_NETWORKANALYSER 0x2020 /* USB Product ID for Network Analyser */
52#define USB_DEVICE_ID_POWERCONTROL 0x2030 /* USB Product ID for Controlling device for Power Electronics */
53
54#define USB_VENDOR_ID_VERNIER 0x08f7
55#define USB_DEVICE_ID_VERNIER_LABPRO 0x0001
56#define USB_DEVICE_ID_VERNIER_GOTEMP 0x0002
57#define USB_DEVICE_ID_VERNIER_SKIP 0x0003
58#define USB_DEVICE_ID_VERNIER_CYCLOPS 0x0004
59
60
61#ifdef CONFIG_USB_DYNAMIC_MINORS
62#define USB_LD_MINOR_BASE 0
63#else
64#define USB_LD_MINOR_BASE 176
65#endif
66
67/* table of devices that work with this driver */
68static struct usb_device_id ld_usb_table [] = {
69 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_CASSY) },
70 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_POCKETCASSY) },
71 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_MOBILECASSY) },
72 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_JWM) },
73 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_DMMP) },
74 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_UMIP) },
75 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_VIDEOCOM) },
76 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_COM3LAB) },
77 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_TELEPORT) },
78 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_NETWORKANALYSER) },
79 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_POWERCONTROL) },
80 { USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_LABPRO) },
81 { USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_GOTEMP) },
82 { USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_SKIP) },
83 { USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_CYCLOPS) },
84 { } /* Terminating entry */
85};
86MODULE_DEVICE_TABLE(usb, ld_usb_table);
87MODULE_VERSION("V0.11");
88MODULE_AUTHOR("Michael Hund <mhund@ld-didactic.de>");
89MODULE_DESCRIPTION("LD USB Driver");
90MODULE_LICENSE("GPL");
91MODULE_SUPPORTED_DEVICE("LD USB Devices");
92
93#ifdef CONFIG_USB_DEBUG
94 static int debug = 1;
95#else
96 static int debug = 0;
97#endif
98
99/* Use our own dbg macro */
100#define dbg_info(dev, format, arg...) do { if (debug) dev_info(dev , format , ## arg); } while (0)
101
102/* Module parameters */
103module_param(debug, int, S_IRUGO | S_IWUSR);
104MODULE_PARM_DESC(debug, "Debug enabled or not");
105
106/* All interrupt in transfers are collected in a ring buffer to
107 * avoid racing conditions and get better performance of the driver.
108 */
109static int ring_buffer_size = 128;
110module_param(ring_buffer_size, int, 0);
111MODULE_PARM_DESC(ring_buffer_size, "Read ring buffer size in reports");
112
113/* The write_buffer can contain more than one interrupt out transfer.
114 */
115static int write_buffer_size = 10;
116module_param(write_buffer_size, int, 0);
117MODULE_PARM_DESC(write_buffer_size, "Write buffer size in reports");
118
119/* As of kernel version 2.6.4 ehci-hcd uses an
120 * "only one interrupt transfer per frame" shortcut
121 * to simplify the scheduling of periodic transfers.
122 * This conflicts with our standard 1ms intervals for in and out URBs.
123 * We use default intervals of 2ms for in and 2ms for out transfers,
124 * which should be fast enough.
125 * Increase the interval to allow more devices that do interrupt transfers,
126 * or set to 1 to use the standard interval from the endpoint descriptors.
127 */
128static int min_interrupt_in_interval = 2;
129module_param(min_interrupt_in_interval, int, 0);
130MODULE_PARM_DESC(min_interrupt_in_interval, "Minimum interrupt in interval in ms");
131
132static int min_interrupt_out_interval = 2;
133module_param(min_interrupt_out_interval, int, 0);
134MODULE_PARM_DESC(min_interrupt_out_interval, "Minimum interrupt out interval in ms");
135
136/* Structure to hold all of our device specific stuff */
137struct ld_usb {
138 struct semaphore sem; /* locks this structure */
139 struct usb_interface* intf; /* save off the usb interface pointer */
140
141 int open_count; /* number of times this port has been opened */
142
143 char* ring_buffer;
144 unsigned int ring_head;
145 unsigned int ring_tail;
146
147 wait_queue_head_t read_wait;
148 wait_queue_head_t write_wait;
149
150 char* interrupt_in_buffer;
151 struct usb_endpoint_descriptor* interrupt_in_endpoint;
152 struct urb* interrupt_in_urb;
153 int interrupt_in_interval;
154 size_t interrupt_in_endpoint_size;
155 int interrupt_in_running;
156 int interrupt_in_done;
157
158 char* interrupt_out_buffer;
159 struct usb_endpoint_descriptor* interrupt_out_endpoint;
160 struct urb* interrupt_out_urb;
161 int interrupt_out_interval;
162 size_t interrupt_out_endpoint_size;
163 int interrupt_out_busy;
164};
165
166/* prevent races between open() and disconnect() */
167static DECLARE_MUTEX(disconnect_sem);
168
169static struct usb_driver ld_usb_driver;
170
171/**
172 * ld_usb_abort_transfers
173 * aborts transfers and frees associated data structures
174 */
175static void ld_usb_abort_transfers(struct ld_usb *dev)
176{
177 /* shutdown transfer */
178 if (dev->interrupt_in_running) {
179 dev->interrupt_in_running = 0;
180 if (dev->intf)
181 usb_kill_urb(dev->interrupt_in_urb);
182 }
183 if (dev->interrupt_out_busy)
184 if (dev->intf)
185 usb_kill_urb(dev->interrupt_out_urb);
186}
187
188/**
189 * ld_usb_delete
190 */
191static void ld_usb_delete(struct ld_usb *dev)
192{
193 ld_usb_abort_transfers(dev);
194
195 /* free data structures */
196 usb_free_urb(dev->interrupt_in_urb);
197 usb_free_urb(dev->interrupt_out_urb);
198 kfree(dev->ring_buffer);
199 kfree(dev->interrupt_in_buffer);
200 kfree(dev->interrupt_out_buffer);
201 kfree(dev);
202}
203
204/**
205 * ld_usb_interrupt_in_callback
206 */
207static void ld_usb_interrupt_in_callback(struct urb *urb, struct pt_regs *regs)
208{
209 struct ld_usb *dev = urb->context;
210 size_t *actual_buffer;
211 unsigned int next_ring_head;
212 int retval;
213
214 if (urb->status) {
215 if (urb->status == -ENOENT ||
216 urb->status == -ECONNRESET ||
217 urb->status == -ESHUTDOWN) {
218 goto exit;
219 } else {
220 dbg_info(&dev->intf->dev, "%s: nonzero status received: %d\n",
221 __FUNCTION__, urb->status);
222 goto resubmit; /* maybe we can recover */
223 }
224 }
225
226 if (urb->actual_length > 0) {
227 next_ring_head = (dev->ring_head+1) % ring_buffer_size;
228 if (next_ring_head != dev->ring_tail) {
229 actual_buffer = (size_t*)(dev->ring_buffer + dev->ring_head*(sizeof(size_t)+dev->interrupt_in_endpoint_size));
230 /* actual_buffer gets urb->actual_length + interrupt_in_buffer */
231 *actual_buffer = urb->actual_length;
232 memcpy(actual_buffer+1, dev->interrupt_in_buffer, urb->actual_length);
233 dev->ring_head = next_ring_head;
234 dbg_info(&dev->intf->dev, "%s: received %d bytes\n",
235 __FUNCTION__, urb->actual_length);
236 } else
237 dev_warn(&dev->intf->dev,
238 "Ring buffer overflow, %d bytes dropped\n",
239 urb->actual_length);
240 }
241
242resubmit:
243 /* resubmit if we're still running */
244 if (dev->interrupt_in_running && dev->intf) {
245 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_ATOMIC);
246 if (retval)
247 dev_err(&dev->intf->dev,
248 "usb_submit_urb failed (%d)\n", retval);
249 }
250
251exit:
252 dev->interrupt_in_done = 1;
253 wake_up_interruptible(&dev->read_wait);
254}
255
256/**
257 * ld_usb_interrupt_out_callback
258 */
259static void ld_usb_interrupt_out_callback(struct urb *urb, struct pt_regs *regs)
260{
261 struct ld_usb *dev = urb->context;
262
263 /* sync/async unlink faults aren't errors */
264 if (urb->status && !(urb->status == -ENOENT ||
265 urb->status == -ECONNRESET ||
266 urb->status == -ESHUTDOWN))
267 dbg_info(&dev->intf->dev,
268 "%s - nonzero write interrupt status received: %d\n",
269 __FUNCTION__, urb->status);
270
271 dev->interrupt_out_busy = 0;
272 wake_up_interruptible(&dev->write_wait);
273}
274
275/**
276 * ld_usb_open
277 */
278static int ld_usb_open(struct inode *inode, struct file *file)
279{
280 struct ld_usb *dev;
281 int subminor;
282 int retval = 0;
283 struct usb_interface *interface;
284
285 nonseekable_open(inode, file);
286 subminor = iminor(inode);
287
288 down(&disconnect_sem);
289
290 interface = usb_find_interface(&ld_usb_driver, subminor);
291
292 if (!interface) {
293 err("%s - error, can't find device for minor %d\n",
294 __FUNCTION__, subminor);
295 retval = -ENODEV;
296 goto unlock_disconnect_exit;
297 }
298
299 dev = usb_get_intfdata(interface);
300
301 if (!dev) {
302 retval = -ENODEV;
303 goto unlock_disconnect_exit;
304 }
305
306 /* lock this device */
307 if (down_interruptible(&dev->sem)) {
308 retval = -ERESTARTSYS;
309 goto unlock_disconnect_exit;
310 }
311
312 /* allow opening only once */
313 if (dev->open_count) {
314 retval = -EBUSY;
315 goto unlock_exit;
316 }
317 dev->open_count = 1;
318
319 /* initialize in direction */
320 dev->ring_head = 0;
321 dev->ring_tail = 0;
322 usb_fill_int_urb(dev->interrupt_in_urb,
323 interface_to_usbdev(interface),
324 usb_rcvintpipe(interface_to_usbdev(interface),
325 dev->interrupt_in_endpoint->bEndpointAddress),
326 dev->interrupt_in_buffer,
327 dev->interrupt_in_endpoint_size,
328 ld_usb_interrupt_in_callback,
329 dev,
330 dev->interrupt_in_interval);
331
332 dev->interrupt_in_running = 1;
333 dev->interrupt_in_done = 0;
334
335 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
336 if (retval) {
337 dev_err(&interface->dev, "Couldn't submit interrupt_in_urb %d\n", retval);
338 dev->interrupt_in_running = 0;
339 dev->open_count = 0;
340 goto unlock_exit;
341 }
342
343 /* save device in the file's private structure */
344 file->private_data = dev;
345
346unlock_exit:
347 up(&dev->sem);
348
349unlock_disconnect_exit:
350 up(&disconnect_sem);
351
352 return retval;
353}
354
355/**
356 * ld_usb_release
357 */
358static int ld_usb_release(struct inode *inode, struct file *file)
359{
360 struct ld_usb *dev;
361 int retval = 0;
362
363 dev = file->private_data;
364
365 if (dev == NULL) {
366 retval = -ENODEV;
367 goto exit;
368 }
369
370 if (down_interruptible(&dev->sem)) {
371 retval = -ERESTARTSYS;
372 goto exit;
373 }
374
375 if (dev->open_count != 1) {
376 retval = -ENODEV;
377 goto unlock_exit;
378 }
379 if (dev->intf == NULL) {
380 /* the device was unplugged before the file was released */
381 up(&dev->sem);
382 /* unlock here as ld_usb_delete frees dev */
383 ld_usb_delete(dev);
384 goto exit;
385 }
386
387 /* wait until write transfer is finished */
388 if (dev->interrupt_out_busy)
389 wait_event_interruptible_timeout(dev->write_wait, !dev->interrupt_out_busy, 2 * HZ);
390 ld_usb_abort_transfers(dev);
391 dev->open_count = 0;
392
393unlock_exit:
394 up(&dev->sem);
395
396exit:
397 return retval;
398}
399
400/**
401 * ld_usb_poll
402 */
403static unsigned int ld_usb_poll(struct file *file, poll_table *wait)
404{
405 struct ld_usb *dev;
406 unsigned int mask = 0;
407
408 dev = file->private_data;
409
410 poll_wait(file, &dev->read_wait, wait);
411 poll_wait(file, &dev->write_wait, wait);
412
413 if (dev->ring_head != dev->ring_tail)
414 mask |= POLLIN | POLLRDNORM;
415 if (!dev->interrupt_out_busy)
416 mask |= POLLOUT | POLLWRNORM;
417
418 return mask;
419}
420
421/**
422 * ld_usb_read
423 */
424static ssize_t ld_usb_read(struct file *file, char __user *buffer, size_t count,
425 loff_t *ppos)
426{
427 struct ld_usb *dev;
428 size_t *actual_buffer;
429 size_t bytes_to_read;
430 int retval = 0;
431
432 dev = file->private_data;
433
434 /* verify that we actually have some data to read */
435 if (count == 0)
436 goto exit;
437
438 /* lock this object */
439 if (down_interruptible(&dev->sem)) {
440 retval = -ERESTARTSYS;
441 goto exit;
442 }
443
444 /* verify that the device wasn't unplugged */
445 if (dev->intf == NULL) {
446 retval = -ENODEV;
447 err("No device or device unplugged %d\n", retval);
448 goto unlock_exit;
449 }
450
451 /* wait for data */
452 if (dev->ring_head == dev->ring_tail) {
453 if (file->f_flags & O_NONBLOCK) {
454 retval = -EAGAIN;
455 goto unlock_exit;
456 }
457 retval = wait_event_interruptible(dev->read_wait, dev->interrupt_in_done);
458 if (retval < 0)
459 goto unlock_exit;
460 }
461
462 /* actual_buffer contains actual_length + interrupt_in_buffer */
463 actual_buffer = (size_t*)(dev->ring_buffer + dev->ring_tail*(sizeof(size_t)+dev->interrupt_in_endpoint_size));
464 bytes_to_read = min(count, *actual_buffer);
465 if (bytes_to_read < *actual_buffer)
466 dev_warn(&dev->intf->dev, "Read buffer overflow, %d bytes dropped\n",
467 *actual_buffer-bytes_to_read);
468
469 /* copy one interrupt_in_buffer from ring_buffer into userspace */
470 if (copy_to_user(buffer, actual_buffer+1, bytes_to_read)) {
471 retval = -EFAULT;
472 goto unlock_exit;
473 }
474 dev->ring_tail = (dev->ring_tail+1) % ring_buffer_size;
475
476 retval = bytes_to_read;
477
478unlock_exit:
479 /* unlock the device */
480 up(&dev->sem);
481
482exit:
483 return retval;
484}
485
486/**
487 * ld_usb_write
488 */
489static ssize_t ld_usb_write(struct file *file, const char __user *buffer,
490 size_t count, loff_t *ppos)
491{
492 struct ld_usb *dev;
493 size_t bytes_to_write;
494 int retval = 0;
495
496 dev = file->private_data;
497
498 /* verify that we actually have some data to write */
499 if (count == 0)
500 goto exit;
501
502 /* lock this object */
503 if (down_interruptible(&dev->sem)) {
504 retval = -ERESTARTSYS;
505 goto exit;
506 }
507
508 /* verify that the device wasn't unplugged */
509 if (dev->intf == NULL) {
510 retval = -ENODEV;
511 err("No device or device unplugged %d\n", retval);
512 goto unlock_exit;
513 }
514
515 /* wait until previous transfer is finished */
516 if (dev->interrupt_out_busy) {
517 if (file->f_flags & O_NONBLOCK) {
518 retval = -EAGAIN;
519 goto unlock_exit;
520 }
521 retval = wait_event_interruptible(dev->write_wait, !dev->interrupt_out_busy);
522 if (retval < 0) {
523 goto unlock_exit;
524 }
525 }
526
527 /* write the data into interrupt_out_buffer from userspace */
528 bytes_to_write = min(count, write_buffer_size*dev->interrupt_out_endpoint_size);
529 if (bytes_to_write < count)
530 dev_warn(&dev->intf->dev, "Write buffer overflow, %d bytes dropped\n",count-bytes_to_write);
531 dbg_info(&dev->intf->dev, "%s: count = %d, bytes_to_write = %d\n", __FUNCTION__, count, bytes_to_write);
532
533 if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write)) {
534 retval = -EFAULT;
535 goto unlock_exit;
536 }
537
538 if (dev->interrupt_out_endpoint == NULL) {
539 /* try HID_REQ_SET_REPORT=9 on control_endpoint instead of interrupt_out_endpoint */
540 retval = usb_control_msg(interface_to_usbdev(dev->intf),
541 usb_sndctrlpipe(interface_to_usbdev(dev->intf), 0),
542 9,
543 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
544 1 << 8, 0,
545 dev->interrupt_out_buffer,
546 bytes_to_write,
547 USB_CTRL_SET_TIMEOUT * HZ);
548 if (retval < 0)
549 err("Couldn't submit HID_REQ_SET_REPORT %d\n", retval);
550 goto unlock_exit;
551 }
552
553 /* send off the urb */
554 usb_fill_int_urb(dev->interrupt_out_urb,
555 interface_to_usbdev(dev->intf),
556 usb_sndintpipe(interface_to_usbdev(dev->intf),
557 dev->interrupt_out_endpoint->bEndpointAddress),
558 dev->interrupt_out_buffer,
559 bytes_to_write,
560 ld_usb_interrupt_out_callback,
561 dev,
562 dev->interrupt_out_interval);
563
564 dev->interrupt_out_busy = 1;
565 wmb();
566
567 retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL);
568 if (retval) {
569 dev->interrupt_out_busy = 0;
570 err("Couldn't submit interrupt_out_urb %d\n", retval);
571 goto unlock_exit;
572 }
573 retval = bytes_to_write;
574
575unlock_exit:
576 /* unlock the device */
577 up(&dev->sem);
578
579exit:
580 return retval;
581}
582
583/* file operations needed when we register this driver */
584static struct file_operations ld_usb_fops = {
585 .owner = THIS_MODULE,
586 .read = ld_usb_read,
587 .write = ld_usb_write,
588 .open = ld_usb_open,
589 .release = ld_usb_release,
590 .poll = ld_usb_poll,
591};
592
593/*
594 * usb class driver info in order to get a minor number from the usb core,
595 * and to have the device registered with devfs and the driver core
596 */
597static struct usb_class_driver ld_usb_class = {
598 .name = "ldusb%d",
599 .fops = &ld_usb_fops,
600 .minor_base = USB_LD_MINOR_BASE,
601};
602
603/**
604 * ld_usb_probe
605 *
606 * Called by the usb core when a new device is connected that it thinks
607 * this driver might be interested in.
608 */
609static int ld_usb_probe(struct usb_interface *intf, const struct usb_device_id *id)
610{
611 struct usb_device *udev = interface_to_usbdev(intf);
612 struct ld_usb *dev = NULL;
613 struct usb_host_interface *iface_desc;
614 struct usb_endpoint_descriptor *endpoint;
615 char *buffer;
616 int i;
617 int retval = -ENOMEM;
618
619 /* allocate memory for our device state and intialize it */
620
621 dev = kmalloc(sizeof(*dev), GFP_KERNEL);
622 if (dev == NULL) {
623 dev_err(&intf->dev, "Out of memory\n");
624 goto exit;
625 }
626 memset(dev, 0x00, sizeof(*dev));
627 init_MUTEX(&dev->sem);
628 dev->intf = intf;
629 init_waitqueue_head(&dev->read_wait);
630 init_waitqueue_head(&dev->write_wait);
631
632 /* workaround for early firmware versions on fast computers */
633 if ((le16_to_cpu(udev->descriptor.idVendor) == USB_VENDOR_ID_LD) &&
634 ((le16_to_cpu(udev->descriptor.idProduct) == USB_DEVICE_ID_CASSY) ||
635 (le16_to_cpu(udev->descriptor.idProduct) == USB_DEVICE_ID_COM3LAB)) &&
636 (le16_to_cpu(udev->descriptor.bcdDevice) <= 0x103)) {
637 buffer = kmalloc(256, GFP_KERNEL);
638 /* usb_string makes SETUP+STALL to leave always ControlReadLoop */
639 usb_string(udev, 255, buffer, 256);
640 kfree(buffer);
641 }
642
643 iface_desc = intf->cur_altsetting;
644
645 /* set up the endpoint information */
646 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
647 endpoint = &iface_desc->endpoint[i].desc;
648
649 if (((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN) &&
650 ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT)) {
651 dev->interrupt_in_endpoint = endpoint;
652 }
653
654 if (((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT) &&
655 ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT)) {
656 dev->interrupt_out_endpoint = endpoint;
657 }
658 }
659 if (dev->interrupt_in_endpoint == NULL) {
660 dev_err(&intf->dev, "Interrupt in endpoint not found\n");
661 goto error;
662 }
663 if (dev->interrupt_out_endpoint == NULL)
664 dev_warn(&intf->dev, "Interrupt out endpoint not found (using control endpoint instead)\n");
665
666 dev->interrupt_in_endpoint_size = le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize);
667 dev->ring_buffer = kmalloc(ring_buffer_size*(sizeof(size_t)+dev->interrupt_in_endpoint_size), GFP_KERNEL);
668 if (!dev->ring_buffer) {
669 dev_err(&intf->dev, "Couldn't allocate ring_buffer\n");
670 goto error;
671 }
672 dev->interrupt_in_buffer = kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL);
673 if (!dev->interrupt_in_buffer) {
674 dev_err(&intf->dev, "Couldn't allocate interrupt_in_buffer\n");
675 goto error;
676 }
677 dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
678 if (!dev->interrupt_in_urb) {
679 dev_err(&intf->dev, "Couldn't allocate interrupt_in_urb\n");
680 goto error;
681 }
682 dev->interrupt_out_endpoint_size = dev->interrupt_out_endpoint ? le16_to_cpu(dev->interrupt_out_endpoint->wMaxPacketSize) :
683 udev->descriptor.bMaxPacketSize0;
684 dev->interrupt_out_buffer = kmalloc(write_buffer_size*dev->interrupt_out_endpoint_size, GFP_KERNEL);
685 if (!dev->interrupt_out_buffer) {
686 dev_err(&intf->dev, "Couldn't allocate interrupt_out_buffer\n");
687 goto error;
688 }
689 dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
690 if (!dev->interrupt_out_urb) {
691 dev_err(&intf->dev, "Couldn't allocate interrupt_out_urb\n");
692 goto error;
693 }
694 dev->interrupt_in_interval = min_interrupt_in_interval > dev->interrupt_in_endpoint->bInterval ? min_interrupt_in_interval : dev->interrupt_in_endpoint->bInterval;
695 if (dev->interrupt_out_endpoint)
696 dev->interrupt_out_interval = min_interrupt_out_interval > dev->interrupt_out_endpoint->bInterval ? min_interrupt_out_interval : dev->interrupt_out_endpoint->bInterval;
697
698 /* we can register the device now, as it is ready */
699 usb_set_intfdata(intf, dev);
700
701 retval = usb_register_dev(intf, &ld_usb_class);
702 if (retval) {
703 /* something prevented us from registering this driver */
704 dev_err(&intf->dev, "Not able to get a minor for this device.\n");
705 usb_set_intfdata(intf, NULL);
706 goto error;
707 }
708
709 /* let the user know what node this device is now attached to */
710 dev_info(&intf->dev, "LD USB Device #%d now attached to major %d minor %d\n",
711 (intf->minor - USB_LD_MINOR_BASE), USB_MAJOR, intf->minor);
712
713exit:
714 return retval;
715
716error:
717 ld_usb_delete(dev);
718
719 return retval;
720}
721
722/**
723 * ld_usb_disconnect
724 *
725 * Called by the usb core when the device is removed from the system.
726 */
727static void ld_usb_disconnect(struct usb_interface *intf)
728{
729 struct ld_usb *dev;
730 int minor;
731
732 down(&disconnect_sem);
733
734 dev = usb_get_intfdata(intf);
735 usb_set_intfdata(intf, NULL);
736
737 down(&dev->sem);
738
739 minor = intf->minor;
740
741 /* give back our minor */
742 usb_deregister_dev(intf, &ld_usb_class);
743
744 /* if the device is not opened, then we clean up right now */
745 if (!dev->open_count) {
746 up(&dev->sem);
747 ld_usb_delete(dev);
748 } else {
749 dev->intf = NULL;
750 up(&dev->sem);
751 }
752
753 up(&disconnect_sem);
754
755 dev_info(&intf->dev, "LD USB Device #%d now disconnected\n",
756 (minor - USB_LD_MINOR_BASE));
757}
758
759/* usb specific object needed to register this driver with the usb subsystem */
760static struct usb_driver ld_usb_driver = {
761 .owner = THIS_MODULE,
762 .name = "ldusb",
763 .probe = ld_usb_probe,
764 .disconnect = ld_usb_disconnect,
765 .id_table = ld_usb_table,
766};
767
768/**
769 * ld_usb_init
770 */
771static int __init ld_usb_init(void)
772{
773 int retval;
774
775 /* register this driver with the USB subsystem */
776 retval = usb_register(&ld_usb_driver);
777 if (retval)
778 err("usb_register failed for the "__FILE__" driver. Error number %d\n", retval);
779
780 return retval;
781}
782
783/**
784 * ld_usb_exit
785 */
786static void __exit ld_usb_exit(void)
787{
788 /* deregister this driver with the USB subsystem */
789 usb_deregister(&ld_usb_driver);
790}
791
792module_init(ld_usb_init);
793module_exit(ld_usb_exit);
794
generated by cgit v1.2.2 (git 2.25.0) at 2025-11-03 09:21:45 -0500