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USB: Make file operations structs in drivers/usb const.
[linux-2.6/x86.git] / drivers / usb / misc / ldusb.c
blob741736b6c134f38db9f23235408668d6ebb58b11
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
66 #ifdef CONFIG_USB_DYNAMIC_MINORS
67 #define USB_LD_MINOR_BASE 0
68 #else
69 #define USB_LD_MINOR_BASE 176
70 #endif
71
72 /* table of devices that work with this driver */
73 static struct usb_device_id ld_usb_table [] = {
74 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_CASSY) },
75 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POCKETCASSY) },
76 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOBILECASSY) },
77 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_JWM) },
78 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_DMMP) },
79 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_UMIP) },
80 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_XRAY1) },
81 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_XRAY2) },
82 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_VIDEOCOM) },
83 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_COM3LAB) },
84 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_TELEPORT) },
85 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_NETWORKANALYSER) },
86 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POWERCONTROL) },
87 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MACHINETEST) },
88 { USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_LABPRO) },
89 { USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_GOTEMP) },
90 { USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_SKIP) },
91 { USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_CYCLOPS) },
92 { } /* Terminating entry */
93 };
94 MODULE_DEVICE_TABLE(usb, ld_usb_table);
95 MODULE_VERSION("V0.13");
96 MODULE_AUTHOR("Michael Hund <mhund@ld-didactic.de>");
97 MODULE_DESCRIPTION("LD USB Driver");
98 MODULE_LICENSE("GPL");
99 MODULE_SUPPORTED_DEVICE("LD USB Devices");
100
101 #ifdef CONFIG_USB_DEBUG
102 static int debug = 1;
103 #else
104 static int debug = 0;
105 #endif
106
107 /* Use our own dbg macro */
108 #define dbg_info(dev, format, arg...) do { if (debug) dev_info(dev , format , ## arg); } while (0)
109
110 /* Module parameters */
111 module_param(debug, int, S_IRUGO | S_IWUSR);
112 MODULE_PARM_DESC(debug, "Debug enabled or not");
113
114 /* All interrupt in transfers are collected in a ring buffer to
115 * avoid racing conditions and get better performance of the driver.
116 */
117 static int ring_buffer_size = 128;
118 module_param(ring_buffer_size, int, 0);
119 MODULE_PARM_DESC(ring_buffer_size, "Read ring buffer size in reports");
120
121 /* The write_buffer can contain more than one interrupt out transfer.
122 */
123 static int write_buffer_size = 10;
124 module_param(write_buffer_size, int, 0);
125 MODULE_PARM_DESC(write_buffer_size, "Write buffer size in reports");
126
127 /* As of kernel version 2.6.4 ehci-hcd uses an
128 * "only one interrupt transfer per frame" shortcut
129 * to simplify the scheduling of periodic transfers.
130 * This conflicts with our standard 1ms intervals for in and out URBs.
131 * We use default intervals of 2ms for in and 2ms for out transfers,
132 * which should be fast enough.
133 * Increase the interval to allow more devices that do interrupt transfers,
134 * or set to 1 to use the standard interval from the endpoint descriptors.
135 */
136 static int min_interrupt_in_interval = 2;
137 module_param(min_interrupt_in_interval, int, 0);
138 MODULE_PARM_DESC(min_interrupt_in_interval, "Minimum interrupt in interval in ms");
139
140 static int min_interrupt_out_interval = 2;
141 module_param(min_interrupt_out_interval, int, 0);
142 MODULE_PARM_DESC(min_interrupt_out_interval, "Minimum interrupt out interval in ms");
143
144 /* Structure to hold all of our device specific stuff */
145 struct ld_usb {
146 struct semaphore sem; /* locks this structure */
147 struct usb_interface* intf; /* save off the usb interface pointer */
148
149 int open_count; /* number of times this port has been opened */
150
151 char* ring_buffer;
152 unsigned int ring_head;
153 unsigned int ring_tail;
154
155 wait_queue_head_t read_wait;
156 wait_queue_head_t write_wait;
157
158 char* interrupt_in_buffer;
159 struct usb_endpoint_descriptor* interrupt_in_endpoint;
160 struct urb* interrupt_in_urb;
161 int interrupt_in_interval;
162 size_t interrupt_in_endpoint_size;
163 int interrupt_in_running;
164 int interrupt_in_done;
165
166 char* interrupt_out_buffer;
167 struct usb_endpoint_descriptor* interrupt_out_endpoint;
168 struct urb* interrupt_out_urb;
169 int interrupt_out_interval;
170 size_t interrupt_out_endpoint_size;
171 int interrupt_out_busy;
172 };
173
174 /* prevent races between open() and disconnect() */
175 static DEFINE_MUTEX(disconnect_mutex);
176
177 static struct usb_driver ld_usb_driver;
178
179 /**
180 * ld_usb_abort_transfers
181 * aborts transfers and frees associated data structures
182 */
183 static void ld_usb_abort_transfers(struct ld_usb *dev)
184 {
185 /* shutdown transfer */
186 if (dev->interrupt_in_running) {
187 dev->interrupt_in_running = 0;
188 if (dev->intf)
189 usb_kill_urb(dev->interrupt_in_urb);
190 }
191 if (dev->interrupt_out_busy)
192 if (dev->intf)
193 usb_kill_urb(dev->interrupt_out_urb);
194 }
195
196 /**
197 * ld_usb_delete
198 */
199 static void ld_usb_delete(struct ld_usb *dev)
200 {
201 ld_usb_abort_transfers(dev);
202
203 /* free data structures */
204 usb_free_urb(dev->interrupt_in_urb);
205 usb_free_urb(dev->interrupt_out_urb);
206 kfree(dev->ring_buffer);
207 kfree(dev->interrupt_in_buffer);
208 kfree(dev->interrupt_out_buffer);
209 kfree(dev);
210 }
211
212 /**
213 * ld_usb_interrupt_in_callback
214 */
215 static void ld_usb_interrupt_in_callback(struct urb *urb, struct pt_regs *regs)
216 {
217 struct ld_usb *dev = urb->context;
218 size_t *actual_buffer;
219 unsigned int next_ring_head;
220 int retval;
221
222 if (urb->status) {
223 if (urb->status == -ENOENT ||
224 urb->status == -ECONNRESET ||
225 urb->status == -ESHUTDOWN) {
226 goto exit;
227 } else {
228 dbg_info(&dev->intf->dev, "%s: nonzero status received: %d\n",
229 __FUNCTION__, urb->status);
230 goto resubmit; /* maybe we can recover */
231 }
232 }
233
234 if (urb->actual_length > 0) {
235 next_ring_head = (dev->ring_head+1) % ring_buffer_size;
236 if (next_ring_head != dev->ring_tail) {
237 actual_buffer = (size_t*)(dev->ring_buffer + dev->ring_head*(sizeof(size_t)+dev->interrupt_in_endpoint_size));
238 /* actual_buffer gets urb->actual_length + interrupt_in_buffer */
239 *actual_buffer = urb->actual_length;
240 memcpy(actual_buffer+1, dev->interrupt_in_buffer, urb->actual_length);
241 dev->ring_head = next_ring_head;
242 dbg_info(&dev->intf->dev, "%s: received %d bytes\n",
243 __FUNCTION__, urb->actual_length);
244 } else
245 dev_warn(&dev->intf->dev,
246 "Ring buffer overflow, %d bytes dropped\n",
247 urb->actual_length);
248 }
249
250 resubmit:
251 /* resubmit if we're still running */
252 if (dev->interrupt_in_running && dev->intf) {
253 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_ATOMIC);
254 if (retval)
255 dev_err(&dev->intf->dev,
256 "usb_submit_urb failed (%d)\n", retval);
257 }
258
259 exit:
260 dev->interrupt_in_done = 1;
261 wake_up_interruptible(&dev->read_wait);
262 }
263
264 /**
265 * ld_usb_interrupt_out_callback
266 */
267 static void ld_usb_interrupt_out_callback(struct urb *urb, struct pt_regs *regs)
268 {
269 struct ld_usb *dev = urb->context;
270
271 /* sync/async unlink faults aren't errors */
272 if (urb->status && !(urb->status == -ENOENT ||
273 urb->status == -ECONNRESET ||
274 urb->status == -ESHUTDOWN))
275 dbg_info(&dev->intf->dev,
276 "%s - nonzero write interrupt status received: %d\n",
277 __FUNCTION__, urb->status);
278
279 dev->interrupt_out_busy = 0;
280 wake_up_interruptible(&dev->write_wait);
281 }
282
283 /**
284 * ld_usb_open
285 */
286 static int ld_usb_open(struct inode *inode, struct file *file)
287 {
288 struct ld_usb *dev;
289 int subminor;
290 int retval = 0;
291 struct usb_interface *interface;
292
293 nonseekable_open(inode, file);
294 subminor = iminor(inode);
295
296 mutex_lock(&disconnect_mutex);
297
298 interface = usb_find_interface(&ld_usb_driver, subminor);
299
300 if (!interface) {
301 err("%s - error, can't find device for minor %d\n",
302 __FUNCTION__, subminor);
303 retval = -ENODEV;
304 goto unlock_disconnect_exit;
305 }
306
307 dev = usb_get_intfdata(interface);
308
309 if (!dev) {
310 retval = -ENODEV;
311 goto unlock_disconnect_exit;
312 }
313
314 /* lock this device */
315 if (down_interruptible(&dev->sem)) {
316 retval = -ERESTARTSYS;
317 goto unlock_disconnect_exit;
318 }
319
320 /* allow opening only once */
321 if (dev->open_count) {
322 retval = -EBUSY;
323 goto unlock_exit;
324 }
325 dev->open_count = 1;
326
327 /* initialize in direction */
328 dev->ring_head = 0;
329 dev->ring_tail = 0;
330 usb_fill_int_urb(dev->interrupt_in_urb,
331 interface_to_usbdev(interface),
332 usb_rcvintpipe(interface_to_usbdev(interface),
333 dev->interrupt_in_endpoint->bEndpointAddress),
334 dev->interrupt_in_buffer,
335 dev->interrupt_in_endpoint_size,
336 ld_usb_interrupt_in_callback,
337 dev,
338 dev->interrupt_in_interval);
339
340 dev->interrupt_in_running = 1;
341 dev->interrupt_in_done = 0;
342
343 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
344 if (retval) {
345 dev_err(&interface->dev, "Couldn't submit interrupt_in_urb %d\n", retval);
346 dev->interrupt_in_running = 0;
347 dev->open_count = 0;
348 goto unlock_exit;
349 }
350
351 /* save device in the file's private structure */
352 file->private_data = dev;
353
354 unlock_exit:
355 up(&dev->sem);
356
357 unlock_disconnect_exit:
358 mutex_unlock(&disconnect_mutex);
359
360 return retval;
361 }
362
363 /**
364 * ld_usb_release
365 */
366 static int ld_usb_release(struct inode *inode, struct file *file)
367 {
368 struct ld_usb *dev;
369 int retval = 0;
370
371 dev = file->private_data;
372
373 if (dev == NULL) {
374 retval = -ENODEV;
375 goto exit;
376 }
377
378 if (down_interruptible(&dev->sem)) {
379 retval = -ERESTARTSYS;
380 goto exit;
381 }
382
383 if (dev->open_count != 1) {
384 retval = -ENODEV;
385 goto unlock_exit;
386 }
387 if (dev->intf == NULL) {
388 /* the device was unplugged before the file was released */
389 up(&dev->sem);
390 /* unlock here as ld_usb_delete frees dev */
391 ld_usb_delete(dev);
392 goto exit;
393 }
394
395 /* wait until write transfer is finished */
396 if (dev->interrupt_out_busy)
397 wait_event_interruptible_timeout(dev->write_wait, !dev->interrupt_out_busy, 2 * HZ);
398 ld_usb_abort_transfers(dev);
399 dev->open_count = 0;
400
401 unlock_exit:
402 up(&dev->sem);
403
404 exit:
405 return retval;
406 }
407
408 /**
409 * ld_usb_poll
410 */
411 static unsigned int ld_usb_poll(struct file *file, poll_table *wait)
412 {
413 struct ld_usb *dev;
414 unsigned int mask = 0;
415
416 dev = file->private_data;
417
418 poll_wait(file, &dev->read_wait, wait);
419 poll_wait(file, &dev->write_wait, wait);
420
421 if (dev->ring_head != dev->ring_tail)
422 mask |= POLLIN | POLLRDNORM;
423 if (!dev->interrupt_out_busy)
424 mask |= POLLOUT | POLLWRNORM;
425
426 return mask;
427 }
428
429 /**
430 * ld_usb_read
431 */
432 static ssize_t ld_usb_read(struct file *file, char __user *buffer, size_t count,
433 loff_t *ppos)
434 {
435 struct ld_usb *dev;
436 size_t *actual_buffer;
437 size_t bytes_to_read;
438 int retval = 0;
439
440 dev = file->private_data;
441
442 /* verify that we actually have some data to read */
443 if (count == 0)
444 goto exit;
445
446 /* lock this object */
447 if (down_interruptible(&dev->sem)) {
448 retval = -ERESTARTSYS;
449 goto exit;
450 }
451
452 /* verify that the device wasn't unplugged */
453 if (dev->intf == NULL) {
454 retval = -ENODEV;
455 err("No device or device unplugged %d\n", retval);
456 goto unlock_exit;
457 }
458
459 /* wait for data */
460 if (dev->ring_head == dev->ring_tail) {
461 if (file->f_flags & O_NONBLOCK) {
462 retval = -EAGAIN;
463 goto unlock_exit;
464 }
465 retval = wait_event_interruptible(dev->read_wait, dev->interrupt_in_done);
466 if (retval < 0)
467 goto unlock_exit;
468 }
469
470 /* actual_buffer contains actual_length + interrupt_in_buffer */
471 actual_buffer = (size_t*)(dev->ring_buffer + dev->ring_tail*(sizeof(size_t)+dev->interrupt_in_endpoint_size));
472 bytes_to_read = min(count, *actual_buffer);
473 if (bytes_to_read < *actual_buffer)
474 dev_warn(&dev->intf->dev, "Read buffer overflow, %zd bytes dropped\n",
475 *actual_buffer-bytes_to_read);
476
477 /* copy one interrupt_in_buffer from ring_buffer into userspace */
478 if (copy_to_user(buffer, actual_buffer+1, bytes_to_read)) {
479 retval = -EFAULT;
480 goto unlock_exit;
481 }
482 dev->ring_tail = (dev->ring_tail+1) % ring_buffer_size;
483
484 retval = bytes_to_read;
485
486 unlock_exit:
487 /* unlock the device */
488 up(&dev->sem);
489
490 exit:
491 return retval;
492 }
493
494 /**
495 * ld_usb_write
496 */
497 static ssize_t ld_usb_write(struct file *file, const char __user *buffer,
498 size_t count, loff_t *ppos)
499 {
500 struct ld_usb *dev;
501 size_t bytes_to_write;
502 int retval = 0;
503
504 dev = file->private_data;
505
506 /* verify that we actually have some data to write */
507 if (count == 0)
508 goto exit;
509
510 /* lock this object */
511 if (down_interruptible(&dev->sem)) {
512 retval = -ERESTARTSYS;
513 goto exit;
514 }
515
516 /* verify that the device wasn't unplugged */
517 if (dev->intf == NULL) {
518 retval = -ENODEV;
519 err("No device or device unplugged %d\n", retval);
520 goto unlock_exit;
521 }
522
523 /* wait until previous transfer is finished */
524 if (dev->interrupt_out_busy) {
525 if (file->f_flags & O_NONBLOCK) {
526 retval = -EAGAIN;
527 goto unlock_exit;
528 }
529 retval = wait_event_interruptible(dev->write_wait, !dev->interrupt_out_busy);
530 if (retval < 0) {
531 goto unlock_exit;
532 }
533 }
534
535 /* write the data into interrupt_out_buffer from userspace */
536 bytes_to_write = min(count, write_buffer_size*dev->interrupt_out_endpoint_size);
537 if (bytes_to_write < count)
538 dev_warn(&dev->intf->dev, "Write buffer overflow, %zd bytes dropped\n",count-bytes_to_write);
539 dbg_info(&dev->intf->dev, "%s: count = %zd, bytes_to_write = %zd\n", __FUNCTION__, count, bytes_to_write);
540
541 if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write)) {
542 retval = -EFAULT;
543 goto unlock_exit;
544 }
545
546 if (dev->interrupt_out_endpoint == NULL) {
547 /* try HID_REQ_SET_REPORT=9 on control_endpoint instead of interrupt_out_endpoint */
548 retval = usb_control_msg(interface_to_usbdev(dev->intf),
549 usb_sndctrlpipe(interface_to_usbdev(dev->intf), 0),
550 9,
551 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
552 1 << 8, 0,
553 dev->interrupt_out_buffer,
554 bytes_to_write,
555 USB_CTRL_SET_TIMEOUT * HZ);
556 if (retval < 0)
557 err("Couldn't submit HID_REQ_SET_REPORT %d\n", retval);
558 goto unlock_exit;
559 }
560
561 /* send off the urb */
562 usb_fill_int_urb(dev->interrupt_out_urb,
563 interface_to_usbdev(dev->intf),
564 usb_sndintpipe(interface_to_usbdev(dev->intf),
565 dev->interrupt_out_endpoint->bEndpointAddress),
566 dev->interrupt_out_buffer,
567 bytes_to_write,
568 ld_usb_interrupt_out_callback,
569 dev,
570 dev->interrupt_out_interval);
571
572 dev->interrupt_out_busy = 1;
573 wmb();
574
575 retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL);
576 if (retval) {
577 dev->interrupt_out_busy = 0;
578 err("Couldn't submit interrupt_out_urb %d\n", retval);
579 goto unlock_exit;
580 }
581 retval = bytes_to_write;
582
583 unlock_exit:
584 /* unlock the device */
585 up(&dev->sem);
586
587 exit:
588 return retval;
589 }
590
591 /* file operations needed when we register this driver */
592 static const struct file_operations ld_usb_fops = {
593 .owner = THIS_MODULE,
594 .read = ld_usb_read,
595 .write = ld_usb_write,
596 .open = ld_usb_open,
597 .release = ld_usb_release,
598 .poll = ld_usb_poll,
599 };
600
601 /*
602 * usb class driver info in order to get a minor number from the usb core,
603 * and to have the device registered with the driver core
604 */
605 static struct usb_class_driver ld_usb_class = {
606 .name = "ldusb%d",
607 .fops = &ld_usb_fops,
608 .minor_base = USB_LD_MINOR_BASE,
609 };
610
611 /**
612 * ld_usb_probe
613 *
614 * Called by the usb core when a new device is connected that it thinks
615 * this driver might be interested in.
616 */
617 static int ld_usb_probe(struct usb_interface *intf, const struct usb_device_id *id)
618 {
619 struct usb_device *udev = interface_to_usbdev(intf);
620 struct ld_usb *dev = NULL;
621 struct usb_host_interface *iface_desc;
622 struct usb_endpoint_descriptor *endpoint;
623 char *buffer;
624 int i;
625 int retval = -ENOMEM;
626
627 /* allocate memory for our device state and intialize it */
628
629 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
630 if (dev == NULL) {
631 dev_err(&intf->dev, "Out of memory\n");
632 goto exit;
633 }
634 init_MUTEX(&dev->sem);
635 dev->intf = intf;
636 init_waitqueue_head(&dev->read_wait);
637 init_waitqueue_head(&dev->write_wait);
638
639 /* workaround for early firmware versions on fast computers */
640 if ((le16_to_cpu(udev->descriptor.idVendor) == USB_VENDOR_ID_LD) &&
641 ((le16_to_cpu(udev->descriptor.idProduct) == USB_DEVICE_ID_LD_CASSY) ||
642 (le16_to_cpu(udev->descriptor.idProduct) == USB_DEVICE_ID_LD_COM3LAB)) &&
643 (le16_to_cpu(udev->descriptor.bcdDevice) <= 0x103)) {
644 buffer = kmalloc(256, GFP_KERNEL);
645 if (buffer == NULL) {
646 dev_err(&intf->dev, "Couldn't allocate string buffer\n");
647 goto error;
648 }
649 /* usb_string makes SETUP+STALL to leave always ControlReadLoop */
650 usb_string(udev, 255, buffer, 256);
651 kfree(buffer);
652 }
653
654 iface_desc = intf->cur_altsetting;
655
656 /* set up the endpoint information */
657 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
658 endpoint = &iface_desc->endpoint[i].desc;
659
660 if (((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN) &&
661 ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT)) {
662 dev->interrupt_in_endpoint = endpoint;
663 }
664
665 if (((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT) &&
666 ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT)) {
667 dev->interrupt_out_endpoint = endpoint;
668 }
669 }
670 if (dev->interrupt_in_endpoint == NULL) {
671 dev_err(&intf->dev, "Interrupt in endpoint not found\n");
672 goto error;
673 }
674 if (dev->interrupt_out_endpoint == NULL)
675 dev_warn(&intf->dev, "Interrupt out endpoint not found (using control endpoint instead)\n");
676
677 dev->interrupt_in_endpoint_size = le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize);
678 dev->ring_buffer = kmalloc(ring_buffer_size*(sizeof(size_t)+dev->interrupt_in_endpoint_size), GFP_KERNEL);
679 if (!dev->ring_buffer) {
680 dev_err(&intf->dev, "Couldn't allocate ring_buffer\n");
681 goto error;
682 }
683 dev->interrupt_in_buffer = kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL);
684 if (!dev->interrupt_in_buffer) {
685 dev_err(&intf->dev, "Couldn't allocate interrupt_in_buffer\n");
686 goto error;
687 }
688 dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
689 if (!dev->interrupt_in_urb) {
690 dev_err(&intf->dev, "Couldn't allocate interrupt_in_urb\n");
691 goto error;
692 }
693 dev->interrupt_out_endpoint_size = dev->interrupt_out_endpoint ? le16_to_cpu(dev->interrupt_out_endpoint->wMaxPacketSize) :
694 udev->descriptor.bMaxPacketSize0;
695 dev->interrupt_out_buffer = kmalloc(write_buffer_size*dev->interrupt_out_endpoint_size, GFP_KERNEL);
696 if (!dev->interrupt_out_buffer) {
697 dev_err(&intf->dev, "Couldn't allocate interrupt_out_buffer\n");
698 goto error;
699 }
700 dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
701 if (!dev->interrupt_out_urb) {
702 dev_err(&intf->dev, "Couldn't allocate interrupt_out_urb\n");
703 goto error;
704 }
705 dev->interrupt_in_interval = min_interrupt_in_interval > dev->interrupt_in_endpoint->bInterval ? min_interrupt_in_interval : dev->interrupt_in_endpoint->bInterval;
706 if (dev->interrupt_out_endpoint)
707 dev->interrupt_out_interval = min_interrupt_out_interval > dev->interrupt_out_endpoint->bInterval ? min_interrupt_out_interval : dev->interrupt_out_endpoint->bInterval;
708
709 /* we can register the device now, as it is ready */
710 usb_set_intfdata(intf, dev);
711
712 retval = usb_register_dev(intf, &ld_usb_class);
713 if (retval) {
714 /* something prevented us from registering this driver */
715 dev_err(&intf->dev, "Not able to get a minor for this device.\n");
716 usb_set_intfdata(intf, NULL);
717 goto error;
718 }
719
720 /* let the user know what node this device is now attached to */
721 dev_info(&intf->dev, "LD USB Device #%d now attached to major %d minor %d\n",
722 (intf->minor - USB_LD_MINOR_BASE), USB_MAJOR, intf->minor);
723
724 exit:
725 return retval;
726
727 error:
728 ld_usb_delete(dev);
729
730 return retval;
731 }
732
733 /**
734 * ld_usb_disconnect
735 *
736 * Called by the usb core when the device is removed from the system.
737 */
738 static void ld_usb_disconnect(struct usb_interface *intf)
739 {
740 struct ld_usb *dev;
741 int minor;
742
743 mutex_lock(&disconnect_mutex);
744
745 dev = usb_get_intfdata(intf);
746 usb_set_intfdata(intf, NULL);
747
748 down(&dev->sem);
749
750 minor = intf->minor;
751
752 /* give back our minor */
753 usb_deregister_dev(intf, &ld_usb_class);
754
755 /* if the device is not opened, then we clean up right now */
756 if (!dev->open_count) {
757 up(&dev->sem);
758 ld_usb_delete(dev);
759 } else {
760 dev->intf = NULL;
761 up(&dev->sem);
762 }
763
764 mutex_unlock(&disconnect_mutex);
765
766 dev_info(&intf->dev, "LD USB Device #%d now disconnected\n",
767 (minor - USB_LD_MINOR_BASE));
768 }
769
770 /* usb specific object needed to register this driver with the usb subsystem */
771 static struct usb_driver ld_usb_driver = {
772 .name = "ldusb",
773 .probe = ld_usb_probe,
774 .disconnect = ld_usb_disconnect,
775 .id_table = ld_usb_table,
776 };
777
778 /**
779 * ld_usb_init
780 */
781 static int __init ld_usb_init(void)
782 {
783 int retval;
784
785 /* register this driver with the USB subsystem */
786 retval = usb_register(&ld_usb_driver);
787 if (retval)
788 err("usb_register failed for the "__FILE__" driver. Error number %d\n", retval);
789
790 return retval;
791 }
792
793 /**
794 * ld_usb_exit
795 */
796 static void __exit ld_usb_exit(void)
797 {
798 /* deregister this driver with the USB subsystem */
799 usb_deregister(&ld_usb_driver);
800 }
801
802 module_init(ld_usb_init);
803 module_exit(ld_usb_exit);
804
x86 "subsystem" repository