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local_t: alpha extension
[usb.git] / drivers / usb / misc / ldusb.c
blob11555bde655bf16c6fc2b049aea6910b1a808fba
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 * V0.12 (mh) Added kmalloc check for string buffer
27 * V0.13 (mh) Added support for LD X-Ray and Machine Test System
28 */
29
30 #include <linux/kernel.h>
31 #include <linux/errno.h>
32 #include <linux/init.h>
33 #include <linux/slab.h>
34 #include <linux/module.h>
35 #include <linux/mutex.h>
36
37 #include <asm/uaccess.h>
38 #include <linux/input.h>
39 #include <linux/usb.h>
40 #include <linux/poll.h>
41
42 /* Define these values to match your devices */
43 #define USB_VENDOR_ID_LD 0x0f11 /* USB Vendor ID of LD Didactic GmbH */
44 #define USB_DEVICE_ID_LD_CASSY 0x1000 /* USB Product ID of CASSY-S */
45 #define USB_DEVICE_ID_LD_POCKETCASSY 0x1010 /* USB Product ID of Pocket-CASSY */
46 #define USB_DEVICE_ID_LD_MOBILECASSY 0x1020 /* USB Product ID of Mobile-CASSY */
47 #define USB_DEVICE_ID_LD_JWM 0x1080 /* USB Product ID of Joule and Wattmeter */
48 #define USB_DEVICE_ID_LD_DMMP 0x1081 /* USB Product ID of Digital Multimeter P (reserved) */
49 #define USB_DEVICE_ID_LD_UMIP 0x1090 /* USB Product ID of UMI P */
50 #define USB_DEVICE_ID_LD_XRAY1 0x1100 /* USB Product ID of X-Ray Apparatus */
51 #define USB_DEVICE_ID_LD_XRAY2 0x1101 /* USB Product ID of X-Ray Apparatus */
52 #define USB_DEVICE_ID_LD_VIDEOCOM 0x1200 /* USB Product ID of VideoCom */
53 #define USB_DEVICE_ID_LD_COM3LAB 0x2000 /* USB Product ID of COM3LAB */
54 #define USB_DEVICE_ID_LD_TELEPORT 0x2010 /* USB Product ID of Terminal Adapter */
55 #define USB_DEVICE_ID_LD_NETWORKANALYSER 0x2020 /* USB Product ID of Network Analyser */
56 #define USB_DEVICE_ID_LD_POWERCONTROL 0x2030 /* USB Product ID of Converter Control Unit */
57 #define USB_DEVICE_ID_LD_MACHINETEST 0x2040 /* USB Product ID of Machine Test System */
58
59 #define USB_VENDOR_ID_VERNIER 0x08f7
60 #define USB_DEVICE_ID_VERNIER_LABPRO 0x0001
61 #define USB_DEVICE_ID_VERNIER_GOTEMP 0x0002
62 #define USB_DEVICE_ID_VERNIER_SKIP 0x0003
63 #define USB_DEVICE_ID_VERNIER_CYCLOPS 0x0004
64
65 #define USB_VENDOR_ID_MICROCHIP 0x04d8
66 #define USB_DEVICE_ID_PICDEM 0x000c
67
68 #ifdef CONFIG_USB_DYNAMIC_MINORS
69 #define USB_LD_MINOR_BASE 0
70 #else
71 #define USB_LD_MINOR_BASE 176
72 #endif
73
74 /* table of devices that work with this driver */
75 static struct usb_device_id ld_usb_table [] = {
76 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_CASSY) },
77 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POCKETCASSY) },
78 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOBILECASSY) },
79 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_JWM) },
80 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_DMMP) },
81 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_UMIP) },
82 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_XRAY1) },
83 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_XRAY2) },
84 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_VIDEOCOM) },
85 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_COM3LAB) },
86 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_TELEPORT) },
87 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_NETWORKANALYSER) },
88 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POWERCONTROL) },
89 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MACHINETEST) },
90 { USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_LABPRO) },
91 { USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_GOTEMP) },
92 { USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_SKIP) },
93 { USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_CYCLOPS) },
94 { USB_DEVICE(USB_VENDOR_ID_MICROCHIP, USB_DEVICE_ID_PICDEM) },
95 { } /* Terminating entry */
96 };
97 MODULE_DEVICE_TABLE(usb, ld_usb_table);
98 MODULE_VERSION("V0.13");
99 MODULE_AUTHOR("Michael Hund <mhund@ld-didactic.de>");
100 MODULE_DESCRIPTION("LD USB Driver");
101 MODULE_LICENSE("GPL");
102 MODULE_SUPPORTED_DEVICE("LD USB Devices");
103
104 #ifdef CONFIG_USB_DEBUG
105 static int debug = 1;
106 #else
107 static int debug = 0;
108 #endif
109
110 /* Use our own dbg macro */
111 #define dbg_info(dev, format, arg...) do { if (debug) dev_info(dev , format , ## arg); } while (0)
112
113 /* Module parameters */
114 module_param(debug, int, S_IRUGO | S_IWUSR);
115 MODULE_PARM_DESC(debug, "Debug enabled or not");
116
117 /* All interrupt in transfers are collected in a ring buffer to
118 * avoid racing conditions and get better performance of the driver.
119 */
120 static int ring_buffer_size = 128;
121 module_param(ring_buffer_size, int, 0);
122 MODULE_PARM_DESC(ring_buffer_size, "Read ring buffer size in reports");
123
124 /* The write_buffer can contain more than one interrupt out transfer.
125 */
126 static int write_buffer_size = 10;
127 module_param(write_buffer_size, int, 0);
128 MODULE_PARM_DESC(write_buffer_size, "Write buffer size in reports");
129
130 /* As of kernel version 2.6.4 ehci-hcd uses an
131 * "only one interrupt transfer per frame" shortcut
132 * to simplify the scheduling of periodic transfers.
133 * This conflicts with our standard 1ms intervals for in and out URBs.
134 * We use default intervals of 2ms for in and 2ms for out transfers,
135 * which should be fast enough.
136 * Increase the interval to allow more devices that do interrupt transfers,
137 * or set to 1 to use the standard interval from the endpoint descriptors.
138 */
139 static int min_interrupt_in_interval = 2;
140 module_param(min_interrupt_in_interval, int, 0);
141 MODULE_PARM_DESC(min_interrupt_in_interval, "Minimum interrupt in interval in ms");
142
143 static int min_interrupt_out_interval = 2;
144 module_param(min_interrupt_out_interval, int, 0);
145 MODULE_PARM_DESC(min_interrupt_out_interval, "Minimum interrupt out interval in ms");
146
147 /* Structure to hold all of our device specific stuff */
148 struct ld_usb {
149 struct semaphore sem; /* locks this structure */
150 struct usb_interface* intf; /* save off the usb interface pointer */
151
152 int open_count; /* number of times this port has been opened */
153
154 char* ring_buffer;
155 unsigned int ring_head;
156 unsigned int ring_tail;
157
158 wait_queue_head_t read_wait;
159 wait_queue_head_t write_wait;
160
161 char* interrupt_in_buffer;
162 struct usb_endpoint_descriptor* interrupt_in_endpoint;
163 struct urb* interrupt_in_urb;
164 int interrupt_in_interval;
165 size_t interrupt_in_endpoint_size;
166 int interrupt_in_running;
167 int interrupt_in_done;
168
169 char* interrupt_out_buffer;
170 struct usb_endpoint_descriptor* interrupt_out_endpoint;
171 struct urb* interrupt_out_urb;
172 int interrupt_out_interval;
173 size_t interrupt_out_endpoint_size;
174 int interrupt_out_busy;
175 };
176
177 /* prevent races between open() and disconnect() */
178 static DEFINE_MUTEX(disconnect_mutex);
179
180 static struct usb_driver ld_usb_driver;
181
182 /**
183 * ld_usb_abort_transfers
184 * aborts transfers and frees associated data structures
185 */
186 static void ld_usb_abort_transfers(struct ld_usb *dev)
187 {
188 /* shutdown transfer */
189 if (dev->interrupt_in_running) {
190 dev->interrupt_in_running = 0;
191 if (dev->intf)
192 usb_kill_urb(dev->interrupt_in_urb);
193 }
194 if (dev->interrupt_out_busy)
195 if (dev->intf)
196 usb_kill_urb(dev->interrupt_out_urb);
197 }
198
199 /**
200 * ld_usb_delete
201 */
202 static void ld_usb_delete(struct ld_usb *dev)
203 {
204 ld_usb_abort_transfers(dev);
205
206 /* free data structures */
207 usb_free_urb(dev->interrupt_in_urb);
208 usb_free_urb(dev->interrupt_out_urb);
209 kfree(dev->ring_buffer);
210 kfree(dev->interrupt_in_buffer);
211 kfree(dev->interrupt_out_buffer);
212 kfree(dev);
213 }
214
215 /**
216 * ld_usb_interrupt_in_callback
217 */
218 static void ld_usb_interrupt_in_callback(struct urb *urb)
219 {
220 struct ld_usb *dev = urb->context;
221 size_t *actual_buffer;
222 unsigned int next_ring_head;
223 int retval;
224
225 if (urb->status) {
226 if (urb->status == -ENOENT ||
227 urb->status == -ECONNRESET ||
228 urb->status == -ESHUTDOWN) {
229 goto exit;
230 } else {
231 dbg_info(&dev->intf->dev, "%s: nonzero status received: %d\n",
232 __FUNCTION__, urb->status);
233 goto resubmit; /* maybe we can recover */
234 }
235 }
236
237 if (urb->actual_length > 0) {
238 next_ring_head = (dev->ring_head+1) % ring_buffer_size;
239 if (next_ring_head != dev->ring_tail) {
240 actual_buffer = (size_t*)(dev->ring_buffer + dev->ring_head*(sizeof(size_t)+dev->interrupt_in_endpoint_size));
241 /* actual_buffer gets urb->actual_length + interrupt_in_buffer */
242 *actual_buffer = urb->actual_length;
243 memcpy(actual_buffer+1, dev->interrupt_in_buffer, urb->actual_length);
244 dev->ring_head = next_ring_head;
245 dbg_info(&dev->intf->dev, "%s: received %d bytes\n",
246 __FUNCTION__, urb->actual_length);
247 } else
248 dev_warn(&dev->intf->dev,
249 "Ring buffer overflow, %d bytes dropped\n",
250 urb->actual_length);
251 }
252
253 resubmit:
254 /* resubmit if we're still running */
255 if (dev->interrupt_in_running && dev->intf) {
256 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_ATOMIC);
257 if (retval)
258 dev_err(&dev->intf->dev,
259 "usb_submit_urb failed (%d)\n", retval);
260 }
261
262 exit:
263 dev->interrupt_in_done = 1;
264 wake_up_interruptible(&dev->read_wait);
265 }
266
267 /**
268 * ld_usb_interrupt_out_callback
269 */
270 static void ld_usb_interrupt_out_callback(struct urb *urb)
271 {
272 struct ld_usb *dev = urb->context;
273
274 /* sync/async unlink faults aren't errors */
275 if (urb->status && !(urb->status == -ENOENT ||
276 urb->status == -ECONNRESET ||
277 urb->status == -ESHUTDOWN))
278 dbg_info(&dev->intf->dev,
279 "%s - nonzero write interrupt status received: %d\n",
280 __FUNCTION__, urb->status);
281
282 dev->interrupt_out_busy = 0;
283 wake_up_interruptible(&dev->write_wait);
284 }
285
286 /**
287 * ld_usb_open
288 */
289 static int ld_usb_open(struct inode *inode, struct file *file)
290 {
291 struct ld_usb *dev;
292 int subminor;
293 int retval = 0;
294 struct usb_interface *interface;
295
296 nonseekable_open(inode, file);
297 subminor = iminor(inode);
298
299 mutex_lock(&disconnect_mutex);
300
301 interface = usb_find_interface(&ld_usb_driver, subminor);
302
303 if (!interface) {
304 err("%s - error, can't find device for minor %d\n",
305 __FUNCTION__, subminor);
306 retval = -ENODEV;
307 goto unlock_disconnect_exit;
308 }
309
310 dev = usb_get_intfdata(interface);
311
312 if (!dev) {
313 retval = -ENODEV;
314 goto unlock_disconnect_exit;
315 }
316
317 /* lock this device */
318 if (down_interruptible(&dev->sem)) {
319 retval = -ERESTARTSYS;
320 goto unlock_disconnect_exit;
321 }
322
323 /* allow opening only once */
324 if (dev->open_count) {
325 retval = -EBUSY;
326 goto unlock_exit;
327 }
328 dev->open_count = 1;
329
330 /* initialize in direction */
331 dev->ring_head = 0;
332 dev->ring_tail = 0;
333 usb_fill_int_urb(dev->interrupt_in_urb,
334 interface_to_usbdev(interface),
335 usb_rcvintpipe(interface_to_usbdev(interface),
336 dev->interrupt_in_endpoint->bEndpointAddress),
337 dev->interrupt_in_buffer,
338 dev->interrupt_in_endpoint_size,
339 ld_usb_interrupt_in_callback,
340 dev,
341 dev->interrupt_in_interval);
342
343 dev->interrupt_in_running = 1;
344 dev->interrupt_in_done = 0;
345
346 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
347 if (retval) {
348 dev_err(&interface->dev, "Couldn't submit interrupt_in_urb %d\n", retval);
349 dev->interrupt_in_running = 0;
350 dev->open_count = 0;
351 goto unlock_exit;
352 }
353
354 /* save device in the file's private structure */
355 file->private_data = dev;
356
357 unlock_exit:
358 up(&dev->sem);
359
360 unlock_disconnect_exit:
361 mutex_unlock(&disconnect_mutex);
362
363 return retval;
364 }
365
366 /**
367 * ld_usb_release
368 */
369 static int ld_usb_release(struct inode *inode, struct file *file)
370 {
371 struct ld_usb *dev;
372 int retval = 0;
373
374 dev = file->private_data;
375
376 if (dev == NULL) {
377 retval = -ENODEV;
378 goto exit;
379 }
380
381 if (down_interruptible(&dev->sem)) {
382 retval = -ERESTARTSYS;
383 goto exit;
384 }
385
386 if (dev->open_count != 1) {
387 retval = -ENODEV;
388 goto unlock_exit;
389 }
390 if (dev->intf == NULL) {
391 /* the device was unplugged before the file was released */
392 up(&dev->sem);
393 /* unlock here as ld_usb_delete frees dev */
394 ld_usb_delete(dev);
395 goto exit;
396 }
397
398 /* wait until write transfer is finished */
399 if (dev->interrupt_out_busy)
400 wait_event_interruptible_timeout(dev->write_wait, !dev->interrupt_out_busy, 2 * HZ);
401 ld_usb_abort_transfers(dev);
402 dev->open_count = 0;
403
404 unlock_exit:
405 up(&dev->sem);
406
407 exit:
408 return retval;
409 }
410
411 /**
412 * ld_usb_poll
413 */
414 static unsigned int ld_usb_poll(struct file *file, poll_table *wait)
415 {
416 struct ld_usb *dev;
417 unsigned int mask = 0;
418
419 dev = file->private_data;
420
421 poll_wait(file, &dev->read_wait, wait);
422 poll_wait(file, &dev->write_wait, wait);
423
424 if (dev->ring_head != dev->ring_tail)
425 mask |= POLLIN | POLLRDNORM;
426 if (!dev->interrupt_out_busy)
427 mask |= POLLOUT | POLLWRNORM;
428
429 return mask;
430 }
431
432 /**
433 * ld_usb_read
434 */
435 static ssize_t ld_usb_read(struct file *file, char __user *buffer, size_t count,
436 loff_t *ppos)
437 {
438 struct ld_usb *dev;
439 size_t *actual_buffer;
440 size_t bytes_to_read;
441 int retval = 0;
442
443 dev = file->private_data;
444
445 /* verify that we actually have some data to read */
446 if (count == 0)
447 goto exit;
448
449 /* lock this object */
450 if (down_interruptible(&dev->sem)) {
451 retval = -ERESTARTSYS;
452 goto exit;
453 }
454
455 /* verify that the device wasn't unplugged */
456 if (dev->intf == NULL) {
457 retval = -ENODEV;
458 err("No device or device unplugged %d\n", retval);
459 goto unlock_exit;
460 }
461
462 /* wait for data */
463 if (dev->ring_head == dev->ring_tail) {
464 if (file->f_flags & O_NONBLOCK) {
465 retval = -EAGAIN;
466 goto unlock_exit;
467 }
468 retval = wait_event_interruptible(dev->read_wait, dev->interrupt_in_done);
469 if (retval < 0)
470 goto unlock_exit;
471 }
472
473 /* actual_buffer contains actual_length + interrupt_in_buffer */
474 actual_buffer = (size_t*)(dev->ring_buffer + dev->ring_tail*(sizeof(size_t)+dev->interrupt_in_endpoint_size));
475 bytes_to_read = min(count, *actual_buffer);
476 if (bytes_to_read < *actual_buffer)
477 dev_warn(&dev->intf->dev, "Read buffer overflow, %zd bytes dropped\n",
478 *actual_buffer-bytes_to_read);
479
480 /* copy one interrupt_in_buffer from ring_buffer into userspace */
481 if (copy_to_user(buffer, actual_buffer+1, bytes_to_read)) {
482 retval = -EFAULT;
483 goto unlock_exit;
484 }
485 dev->ring_tail = (dev->ring_tail+1) % ring_buffer_size;
486
487 retval = bytes_to_read;
488
489 unlock_exit:
490 /* unlock the device */
491 up(&dev->sem);
492
493 exit:
494 return retval;
495 }
496
497 /**
498 * ld_usb_write
499 */
500 static ssize_t ld_usb_write(struct file *file, const char __user *buffer,
501 size_t count, loff_t *ppos)
502 {
503 struct ld_usb *dev;
504 size_t bytes_to_write;
505 int retval = 0;
506
507 dev = file->private_data;
508
509 /* verify that we actually have some data to write */
510 if (count == 0)
511 goto exit;
512
513 /* lock this object */
514 if (down_interruptible(&dev->sem)) {
515 retval = -ERESTARTSYS;
516 goto exit;
517 }
518
519 /* verify that the device wasn't unplugged */
520 if (dev->intf == NULL) {
521 retval = -ENODEV;
522 err("No device or device unplugged %d\n", retval);
523 goto unlock_exit;
524 }
525
526 /* wait until previous transfer is finished */
527 if (dev->interrupt_out_busy) {
528 if (file->f_flags & O_NONBLOCK) {
529 retval = -EAGAIN;
530 goto unlock_exit;
531 }
532 retval = wait_event_interruptible(dev->write_wait, !dev->interrupt_out_busy);
533 if (retval < 0) {
534 goto unlock_exit;
535 }
536 }
537
538 /* write the data into interrupt_out_buffer from userspace */
539 bytes_to_write = min(count, write_buffer_size*dev->interrupt_out_endpoint_size);
540 if (bytes_to_write < count)
541 dev_warn(&dev->intf->dev, "Write buffer overflow, %zd bytes dropped\n",count-bytes_to_write);
542 dbg_info(&dev->intf->dev, "%s: count = %zd, bytes_to_write = %zd\n", __FUNCTION__, count, bytes_to_write);
543
544 if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write)) {
545 retval = -EFAULT;
546 goto unlock_exit;
547 }
548
549 if (dev->interrupt_out_endpoint == NULL) {
550 /* try HID_REQ_SET_REPORT=9 on control_endpoint instead of interrupt_out_endpoint */
551 retval = usb_control_msg(interface_to_usbdev(dev->intf),
552 usb_sndctrlpipe(interface_to_usbdev(dev->intf), 0),
553 9,
554 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
555 1 << 8, 0,
556 dev->interrupt_out_buffer,
557 bytes_to_write,
558 USB_CTRL_SET_TIMEOUT * HZ);
559 if (retval < 0)
560 err("Couldn't submit HID_REQ_SET_REPORT %d\n", retval);
561 goto unlock_exit;
562 }
563
564 /* send off the urb */
565 usb_fill_int_urb(dev->interrupt_out_urb,
566 interface_to_usbdev(dev->intf),
567 usb_sndintpipe(interface_to_usbdev(dev->intf),
568 dev->interrupt_out_endpoint->bEndpointAddress),
569 dev->interrupt_out_buffer,
570 bytes_to_write,
571 ld_usb_interrupt_out_callback,
572 dev,
573 dev->interrupt_out_interval);
574
575 dev->interrupt_out_busy = 1;
576 wmb();
577
578 retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL);
579 if (retval) {
580 dev->interrupt_out_busy = 0;
581 err("Couldn't submit interrupt_out_urb %d\n", retval);
582 goto unlock_exit;
583 }
584 retval = bytes_to_write;
585
586 unlock_exit:
587 /* unlock the device */
588 up(&dev->sem);
589
590 exit:
591 return retval;
592 }
593
594 /* file operations needed when we register this driver */
595 static const struct file_operations ld_usb_fops = {
596 .owner = THIS_MODULE,
597 .read = ld_usb_read,
598 .write = ld_usb_write,
599 .open = ld_usb_open,
600 .release = ld_usb_release,
601 .poll = ld_usb_poll,
602 };
603
604 /*
605 * usb class driver info in order to get a minor number from the usb core,
606 * and to have the device registered with the driver core
607 */
608 static struct usb_class_driver ld_usb_class = {
609 .name = "ldusb%d",
610 .fops = &ld_usb_fops,
611 .minor_base = USB_LD_MINOR_BASE,
612 };
613
614 /**
615 * ld_usb_probe
616 *
617 * Called by the usb core when a new device is connected that it thinks
618 * this driver might be interested in.
619 */
620 static int ld_usb_probe(struct usb_interface *intf, const struct usb_device_id *id)
621 {
622 struct usb_device *udev = interface_to_usbdev(intf);
623 struct ld_usb *dev = NULL;
624 struct usb_host_interface *iface_desc;
625 struct usb_endpoint_descriptor *endpoint;
626 char *buffer;
627 int i;
628 int retval = -ENOMEM;
629
630 /* allocate memory for our device state and intialize it */
631
632 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
633 if (dev == NULL) {
634 dev_err(&intf->dev, "Out of memory\n");
635 goto exit;
636 }
637 init_MUTEX(&dev->sem);
638 dev->intf = intf;
639 init_waitqueue_head(&dev->read_wait);
640 init_waitqueue_head(&dev->write_wait);
641
642 /* workaround for early firmware versions on fast computers */
643 if ((le16_to_cpu(udev->descriptor.idVendor) == USB_VENDOR_ID_LD) &&
644 ((le16_to_cpu(udev->descriptor.idProduct) == USB_DEVICE_ID_LD_CASSY) ||
645 (le16_to_cpu(udev->descriptor.idProduct) == USB_DEVICE_ID_LD_COM3LAB)) &&
646 (le16_to_cpu(udev->descriptor.bcdDevice) <= 0x103)) {
647 buffer = kmalloc(256, GFP_KERNEL);
648 if (buffer == NULL) {
649 dev_err(&intf->dev, "Couldn't allocate string buffer\n");
650 goto error;
651 }
652 /* usb_string makes SETUP+STALL to leave always ControlReadLoop */
653 usb_string(udev, 255, buffer, 256);
654 kfree(buffer);
655 }
656
657 iface_desc = intf->cur_altsetting;
658
659 /* set up the endpoint information */
660 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
661 endpoint = &iface_desc->endpoint[i].desc;
662
663 if (usb_endpoint_is_int_in(endpoint))
664 dev->interrupt_in_endpoint = endpoint;
665
666 if (usb_endpoint_is_int_out(endpoint))
667 dev->interrupt_out_endpoint = endpoint;
668 }
669 if (dev->interrupt_in_endpoint == NULL) {
670 dev_err(&intf->dev, "Interrupt in endpoint not found\n");
671 goto error;
672 }
673 if (dev->interrupt_out_endpoint == NULL)
674 dev_warn(&intf->dev, "Interrupt out endpoint not found (using control endpoint instead)\n");
675
676 dev->interrupt_in_endpoint_size = le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize);
677 dev->ring_buffer = kmalloc(ring_buffer_size*(sizeof(size_t)+dev->interrupt_in_endpoint_size), GFP_KERNEL);
678 if (!dev->ring_buffer) {
679 dev_err(&intf->dev, "Couldn't allocate ring_buffer\n");
680 goto error;
681 }
682 dev->interrupt_in_buffer = kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL);
683 if (!dev->interrupt_in_buffer) {
684 dev_err(&intf->dev, "Couldn't allocate interrupt_in_buffer\n");
685 goto error;
686 }
687 dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
688 if (!dev->interrupt_in_urb) {
689 dev_err(&intf->dev, "Couldn't allocate interrupt_in_urb\n");
690 goto error;
691 }
692 dev->interrupt_out_endpoint_size = dev->interrupt_out_endpoint ? le16_to_cpu(dev->interrupt_out_endpoint->wMaxPacketSize) :
693 udev->descriptor.bMaxPacketSize0;
694 dev->interrupt_out_buffer = kmalloc(write_buffer_size*dev->interrupt_out_endpoint_size, GFP_KERNEL);
695 if (!dev->interrupt_out_buffer) {
696 dev_err(&intf->dev, "Couldn't allocate interrupt_out_buffer\n");
697 goto error;
698 }
699 dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
700 if (!dev->interrupt_out_urb) {
701 dev_err(&intf->dev, "Couldn't allocate interrupt_out_urb\n");
702 goto error;
703 }
704 dev->interrupt_in_interval = min_interrupt_in_interval > dev->interrupt_in_endpoint->bInterval ? min_interrupt_in_interval : dev->interrupt_in_endpoint->bInterval;
705 if (dev->interrupt_out_endpoint)
706 dev->interrupt_out_interval = min_interrupt_out_interval > dev->interrupt_out_endpoint->bInterval ? min_interrupt_out_interval : dev->interrupt_out_endpoint->bInterval;
707
708 /* we can register the device now, as it is ready */
709 usb_set_intfdata(intf, dev);
710
711 retval = usb_register_dev(intf, &ld_usb_class);
712 if (retval) {
713 /* something prevented us from registering this driver */
714 dev_err(&intf->dev, "Not able to get a minor for this device.\n");
715 usb_set_intfdata(intf, NULL);
716 goto error;
717 }
718
719 /* let the user know what node this device is now attached to */
720 dev_info(&intf->dev, "LD USB Device #%d now attached to major %d minor %d\n",
721 (intf->minor - USB_LD_MINOR_BASE), USB_MAJOR, intf->minor);
722
723 exit:
724 return retval;
725
726 error:
727 ld_usb_delete(dev);
728
729 return retval;
730 }
731
732 /**
733 * ld_usb_disconnect
734 *
735 * Called by the usb core when the device is removed from the system.
736 */
737 static void ld_usb_disconnect(struct usb_interface *intf)
738 {
739 struct ld_usb *dev;
740 int minor;
741
742 mutex_lock(&disconnect_mutex);
743
744 dev = usb_get_intfdata(intf);
745 usb_set_intfdata(intf, NULL);
746
747 down(&dev->sem);
748
749 minor = intf->minor;
750
751 /* give back our minor */
752 usb_deregister_dev(intf, &ld_usb_class);
753
754 /* if the device is not opened, then we clean up right now */
755 if (!dev->open_count) {
756 up(&dev->sem);
757 ld_usb_delete(dev);
758 } else {
759 dev->intf = NULL;
760 up(&dev->sem);
761 }
762
763 mutex_unlock(&disconnect_mutex);
764
765 dev_info(&intf->dev, "LD USB Device #%d now disconnected\n",
766 (minor - USB_LD_MINOR_BASE));
767 }
768
769 /* usb specific object needed to register this driver with the usb subsystem */
770 static struct usb_driver ld_usb_driver = {
771 .name = "ldusb",
772 .probe = ld_usb_probe,
773 .disconnect = ld_usb_disconnect,
774 .id_table = ld_usb_table,
775 };
776
777 /**
778 * ld_usb_init
779 */
780 static int __init ld_usb_init(void)
781 {
782 int retval;
783
784 /* register this driver with the USB subsystem */
785 retval = usb_register(&ld_usb_driver);
786 if (retval)
787 err("usb_register failed for the "__FILE__" driver. Error number %d\n", retval);
788
789 return retval;
790 }
791
792 /**
793 * ld_usb_exit
794 */
795 static void __exit ld_usb_exit(void)
796 {
797 /* deregister this driver with the USB subsystem */
798 usb_deregister(&ld_usb_driver);
799 }
800
801 module_init(ld_usb_init);
802 module_exit(ld_usb_exit);
803
USB Experimental Work