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knfsd: nfsd4: fix handling of acl errrors
[pv_ops_mirror.git] / drivers / usb / misc / ldusb.c
blob5e950b90c5414900fb1f7f8fe91a750660dda56d
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 int buffer_overflow;
169 spinlock_t rbsl;
170
171 char* interrupt_out_buffer;
172 struct usb_endpoint_descriptor* interrupt_out_endpoint;
173 struct urb* interrupt_out_urb;
174 int interrupt_out_interval;
175 size_t interrupt_out_endpoint_size;
176 int interrupt_out_busy;
177 };
178
179 static struct usb_driver ld_usb_driver;
180
181 /**
182 * ld_usb_abort_transfers
183 * aborts transfers and frees associated data structures
184 */
185 static void ld_usb_abort_transfers(struct ld_usb *dev)
186 {
187 /* shutdown transfer */
188 if (dev->interrupt_in_running) {
189 dev->interrupt_in_running = 0;
190 if (dev->intf)
191 usb_kill_urb(dev->interrupt_in_urb);
192 }
193 if (dev->interrupt_out_busy)
194 if (dev->intf)
195 usb_kill_urb(dev->interrupt_out_urb);
196 }
197
198 /**
199 * ld_usb_delete
200 */
201 static void ld_usb_delete(struct ld_usb *dev)
202 {
203 ld_usb_abort_transfers(dev);
204
205 /* free data structures */
206 usb_free_urb(dev->interrupt_in_urb);
207 usb_free_urb(dev->interrupt_out_urb);
208 kfree(dev->ring_buffer);
209 kfree(dev->interrupt_in_buffer);
210 kfree(dev->interrupt_out_buffer);
211 kfree(dev);
212 }
213
214 /**
215 * ld_usb_interrupt_in_callback
216 */
217 static void ld_usb_interrupt_in_callback(struct urb *urb)
218 {
219 struct ld_usb *dev = urb->context;
220 size_t *actual_buffer;
221 unsigned int next_ring_head;
222 int retval;
223
224 if (urb->status) {
225 if (urb->status == -ENOENT ||
226 urb->status == -ECONNRESET ||
227 urb->status == -ESHUTDOWN) {
228 goto exit;
229 } else {
230 dbg_info(&dev->intf->dev, "%s: nonzero status received: %d\n",
231 __FUNCTION__, urb->status);
232 spin_lock(&dev->rbsl);
233 goto resubmit; /* maybe we can recover */
234 }
235 }
236
237 spin_lock(&dev->rbsl);
238 if (urb->actual_length > 0) {
239 next_ring_head = (dev->ring_head+1) % ring_buffer_size;
240 if (next_ring_head != dev->ring_tail) {
241 actual_buffer = (size_t*)(dev->ring_buffer + dev->ring_head*(sizeof(size_t)+dev->interrupt_in_endpoint_size));
242 /* actual_buffer gets urb->actual_length + interrupt_in_buffer */
243 *actual_buffer = urb->actual_length;
244 memcpy(actual_buffer+1, dev->interrupt_in_buffer, urb->actual_length);
245 dev->ring_head = next_ring_head;
246 dbg_info(&dev->intf->dev, "%s: received %d bytes\n",
247 __FUNCTION__, urb->actual_length);
248 } else {
249 dev_warn(&dev->intf->dev,
250 "Ring buffer overflow, %d bytes dropped\n",
251 urb->actual_length);
252 dev->buffer_overflow = 1;
253 }
254 }
255
256 resubmit:
257 /* resubmit if we're still running */
258 if (dev->interrupt_in_running && !dev->buffer_overflow && dev->intf) {
259 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_ATOMIC);
260 if (retval) {
261 dev_err(&dev->intf->dev,
262 "usb_submit_urb failed (%d)\n", retval);
263 dev->buffer_overflow = 1;
264 }
265 }
266 spin_unlock(&dev->rbsl);
267 exit:
268 dev->interrupt_in_done = 1;
269 wake_up_interruptible(&dev->read_wait);
270 }
271
272 /**
273 * ld_usb_interrupt_out_callback
274 */
275 static void ld_usb_interrupt_out_callback(struct urb *urb)
276 {
277 struct ld_usb *dev = urb->context;
278
279 /* sync/async unlink faults aren't errors */
280 if (urb->status && !(urb->status == -ENOENT ||
281 urb->status == -ECONNRESET ||
282 urb->status == -ESHUTDOWN))
283 dbg_info(&dev->intf->dev,
284 "%s - nonzero write interrupt status received: %d\n",
285 __FUNCTION__, urb->status);
286
287 dev->interrupt_out_busy = 0;
288 wake_up_interruptible(&dev->write_wait);
289 }
290
291 /**
292 * ld_usb_open
293 */
294 static int ld_usb_open(struct inode *inode, struct file *file)
295 {
296 struct ld_usb *dev;
297 int subminor;
298 int retval;
299 struct usb_interface *interface;
300
301 nonseekable_open(inode, file);
302 subminor = iminor(inode);
303
304 interface = usb_find_interface(&ld_usb_driver, subminor);
305
306 if (!interface) {
307 err("%s - error, can't find device for minor %d\n",
308 __FUNCTION__, subminor);
309 return -ENODEV;
310 }
311
312 dev = usb_get_intfdata(interface);
313
314 if (!dev)
315 return -ENODEV;
316
317 /* lock this device */
318 if (down_interruptible(&dev->sem))
319 return -ERESTARTSYS;
320
321 /* allow opening only once */
322 if (dev->open_count) {
323 retval = -EBUSY;
324 goto unlock_exit;
325 }
326 dev->open_count = 1;
327
328 /* initialize in direction */
329 dev->ring_head = 0;
330 dev->ring_tail = 0;
331 dev->buffer_overflow = 0;
332 usb_fill_int_urb(dev->interrupt_in_urb,
333 interface_to_usbdev(interface),
334 usb_rcvintpipe(interface_to_usbdev(interface),
335 dev->interrupt_in_endpoint->bEndpointAddress),
336 dev->interrupt_in_buffer,
337 dev->interrupt_in_endpoint_size,
338 ld_usb_interrupt_in_callback,
339 dev,
340 dev->interrupt_in_interval);
341
342 dev->interrupt_in_running = 1;
343 dev->interrupt_in_done = 0;
344
345 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
346 if (retval) {
347 dev_err(&interface->dev, "Couldn't submit interrupt_in_urb %d\n", retval);
348 dev->interrupt_in_running = 0;
349 dev->open_count = 0;
350 goto unlock_exit;
351 }
352
353 /* save device in the file's private structure */
354 file->private_data = dev;
355
356 unlock_exit:
357 up(&dev->sem);
358
359 return retval;
360 }
361
362 /**
363 * ld_usb_release
364 */
365 static int ld_usb_release(struct inode *inode, struct file *file)
366 {
367 struct ld_usb *dev;
368 int retval = 0;
369
370 dev = file->private_data;
371
372 if (dev == NULL) {
373 retval = -ENODEV;
374 goto exit;
375 }
376
377 if (down_interruptible(&dev->sem)) {
378 retval = -ERESTARTSYS;
379 goto exit;
380 }
381
382 if (dev->open_count != 1) {
383 retval = -ENODEV;
384 goto unlock_exit;
385 }
386 if (dev->intf == NULL) {
387 /* the device was unplugged before the file was released */
388 up(&dev->sem);
389 /* unlock here as ld_usb_delete frees dev */
390 ld_usb_delete(dev);
391 goto exit;
392 }
393
394 /* wait until write transfer is finished */
395 if (dev->interrupt_out_busy)
396 wait_event_interruptible_timeout(dev->write_wait, !dev->interrupt_out_busy, 2 * HZ);
397 ld_usb_abort_transfers(dev);
398 dev->open_count = 0;
399
400 unlock_exit:
401 up(&dev->sem);
402
403 exit:
404 return retval;
405 }
406
407 /**
408 * ld_usb_poll
409 */
410 static unsigned int ld_usb_poll(struct file *file, poll_table *wait)
411 {
412 struct ld_usb *dev;
413 unsigned int mask = 0;
414
415 dev = file->private_data;
416
417 poll_wait(file, &dev->read_wait, wait);
418 poll_wait(file, &dev->write_wait, wait);
419
420 if (dev->ring_head != dev->ring_tail)
421 mask |= POLLIN | POLLRDNORM;
422 if (!dev->interrupt_out_busy)
423 mask |= POLLOUT | POLLWRNORM;
424
425 return mask;
426 }
427
428 /**
429 * ld_usb_read
430 */
431 static ssize_t ld_usb_read(struct file *file, char __user *buffer, size_t count,
432 loff_t *ppos)
433 {
434 struct ld_usb *dev;
435 size_t *actual_buffer;
436 size_t bytes_to_read;
437 int retval = 0;
438 int rv;
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 spin_lock_irq(&dev->rbsl);
461 if (dev->ring_head == dev->ring_tail) {
462 dev->interrupt_in_done = 0;
463 spin_unlock_irq(&dev->rbsl);
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 } else {
472 spin_unlock_irq(&dev->rbsl);
473 }
474
475 /* actual_buffer contains actual_length + interrupt_in_buffer */
476 actual_buffer = (size_t*)(dev->ring_buffer + dev->ring_tail*(sizeof(size_t)+dev->interrupt_in_endpoint_size));
477 bytes_to_read = min(count, *actual_buffer);
478 if (bytes_to_read < *actual_buffer)
479 dev_warn(&dev->intf->dev, "Read buffer overflow, %zd bytes dropped\n",
480 *actual_buffer-bytes_to_read);
481
482 /* copy one interrupt_in_buffer from ring_buffer into userspace */
483 if (copy_to_user(buffer, actual_buffer+1, bytes_to_read)) {
484 retval = -EFAULT;
485 goto unlock_exit;
486 }
487 dev->ring_tail = (dev->ring_tail+1) % ring_buffer_size;
488
489 retval = bytes_to_read;
490
491 spin_lock_irq(&dev->rbsl);
492 if (dev->buffer_overflow) {
493 dev->buffer_overflow = 0;
494 spin_unlock_irq(&dev->rbsl);
495 rv = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
496 if (rv < 0)
497 dev->buffer_overflow = 1;
498 } else {
499 spin_unlock_irq(&dev->rbsl);
500 }
501
502 unlock_exit:
503 /* unlock the device */
504 up(&dev->sem);
505
506 exit:
507 return retval;
508 }
509
510 /**
511 * ld_usb_write
512 */
513 static ssize_t ld_usb_write(struct file *file, const char __user *buffer,
514 size_t count, loff_t *ppos)
515 {
516 struct ld_usb *dev;
517 size_t bytes_to_write;
518 int retval = 0;
519
520 dev = file->private_data;
521
522 /* verify that we actually have some data to write */
523 if (count == 0)
524 goto exit;
525
526 /* lock this object */
527 if (down_interruptible(&dev->sem)) {
528 retval = -ERESTARTSYS;
529 goto exit;
530 }
531
532 /* verify that the device wasn't unplugged */
533 if (dev->intf == NULL) {
534 retval = -ENODEV;
535 err("No device or device unplugged %d\n", retval);
536 goto unlock_exit;
537 }
538
539 /* wait until previous transfer is finished */
540 if (dev->interrupt_out_busy) {
541 if (file->f_flags & O_NONBLOCK) {
542 retval = -EAGAIN;
543 goto unlock_exit;
544 }
545 retval = wait_event_interruptible(dev->write_wait, !dev->interrupt_out_busy);
546 if (retval < 0) {
547 goto unlock_exit;
548 }
549 }
550
551 /* write the data into interrupt_out_buffer from userspace */
552 bytes_to_write = min(count, write_buffer_size*dev->interrupt_out_endpoint_size);
553 if (bytes_to_write < count)
554 dev_warn(&dev->intf->dev, "Write buffer overflow, %zd bytes dropped\n",count-bytes_to_write);
555 dbg_info(&dev->intf->dev, "%s: count = %zd, bytes_to_write = %zd\n", __FUNCTION__, count, bytes_to_write);
556
557 if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write)) {
558 retval = -EFAULT;
559 goto unlock_exit;
560 }
561
562 if (dev->interrupt_out_endpoint == NULL) {
563 /* try HID_REQ_SET_REPORT=9 on control_endpoint instead of interrupt_out_endpoint */
564 retval = usb_control_msg(interface_to_usbdev(dev->intf),
565 usb_sndctrlpipe(interface_to_usbdev(dev->intf), 0),
566 9,
567 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
568 1 << 8, 0,
569 dev->interrupt_out_buffer,
570 bytes_to_write,
571 USB_CTRL_SET_TIMEOUT * HZ);
572 if (retval < 0)
573 err("Couldn't submit HID_REQ_SET_REPORT %d\n", retval);
574 goto unlock_exit;
575 }
576
577 /* send off the urb */
578 usb_fill_int_urb(dev->interrupt_out_urb,
579 interface_to_usbdev(dev->intf),
580 usb_sndintpipe(interface_to_usbdev(dev->intf),
581 dev->interrupt_out_endpoint->bEndpointAddress),
582 dev->interrupt_out_buffer,
583 bytes_to_write,
584 ld_usb_interrupt_out_callback,
585 dev,
586 dev->interrupt_out_interval);
587
588 dev->interrupt_out_busy = 1;
589 wmb();
590
591 retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL);
592 if (retval) {
593 dev->interrupt_out_busy = 0;
594 err("Couldn't submit interrupt_out_urb %d\n", retval);
595 goto unlock_exit;
596 }
597 retval = bytes_to_write;
598
599 unlock_exit:
600 /* unlock the device */
601 up(&dev->sem);
602
603 exit:
604 return retval;
605 }
606
607 /* file operations needed when we register this driver */
608 static const struct file_operations ld_usb_fops = {
609 .owner = THIS_MODULE,
610 .read = ld_usb_read,
611 .write = ld_usb_write,
612 .open = ld_usb_open,
613 .release = ld_usb_release,
614 .poll = ld_usb_poll,
615 };
616
617 /*
618 * usb class driver info in order to get a minor number from the usb core,
619 * and to have the device registered with the driver core
620 */
621 static struct usb_class_driver ld_usb_class = {
622 .name = "ldusb%d",
623 .fops = &ld_usb_fops,
624 .minor_base = USB_LD_MINOR_BASE,
625 };
626
627 /**
628 * ld_usb_probe
629 *
630 * Called by the usb core when a new device is connected that it thinks
631 * this driver might be interested in.
632 */
633 static int ld_usb_probe(struct usb_interface *intf, const struct usb_device_id *id)
634 {
635 struct usb_device *udev = interface_to_usbdev(intf);
636 struct ld_usb *dev = NULL;
637 struct usb_host_interface *iface_desc;
638 struct usb_endpoint_descriptor *endpoint;
639 char *buffer;
640 int i;
641 int retval = -ENOMEM;
642
643 /* allocate memory for our device state and intialize it */
644
645 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
646 if (dev == NULL) {
647 dev_err(&intf->dev, "Out of memory\n");
648 goto exit;
649 }
650 init_MUTEX(&dev->sem);
651 spin_lock_init(&dev->rbsl);
652 dev->intf = intf;
653 init_waitqueue_head(&dev->read_wait);
654 init_waitqueue_head(&dev->write_wait);
655
656 /* workaround for early firmware versions on fast computers */
657 if ((le16_to_cpu(udev->descriptor.idVendor) == USB_VENDOR_ID_LD) &&
658 ((le16_to_cpu(udev->descriptor.idProduct) == USB_DEVICE_ID_LD_CASSY) ||
659 (le16_to_cpu(udev->descriptor.idProduct) == USB_DEVICE_ID_LD_COM3LAB)) &&
660 (le16_to_cpu(udev->descriptor.bcdDevice) <= 0x103)) {
661 buffer = kmalloc(256, GFP_KERNEL);
662 if (buffer == NULL) {
663 dev_err(&intf->dev, "Couldn't allocate string buffer\n");
664 goto error;
665 }
666 /* usb_string makes SETUP+STALL to leave always ControlReadLoop */
667 usb_string(udev, 255, buffer, 256);
668 kfree(buffer);
669 }
670
671 iface_desc = intf->cur_altsetting;
672
673 /* set up the endpoint information */
674 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
675 endpoint = &iface_desc->endpoint[i].desc;
676
677 if (usb_endpoint_is_int_in(endpoint))
678 dev->interrupt_in_endpoint = endpoint;
679
680 if (usb_endpoint_is_int_out(endpoint))
681 dev->interrupt_out_endpoint = endpoint;
682 }
683 if (dev->interrupt_in_endpoint == NULL) {
684 dev_err(&intf->dev, "Interrupt in endpoint not found\n");
685 goto error;
686 }
687 if (dev->interrupt_out_endpoint == NULL)
688 dev_warn(&intf->dev, "Interrupt out endpoint not found (using control endpoint instead)\n");
689
690 dev->interrupt_in_endpoint_size = le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize);
691 dev->ring_buffer = kmalloc(ring_buffer_size*(sizeof(size_t)+dev->interrupt_in_endpoint_size), GFP_KERNEL);
692 if (!dev->ring_buffer) {
693 dev_err(&intf->dev, "Couldn't allocate ring_buffer\n");
694 goto error;
695 }
696 dev->interrupt_in_buffer = kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL);
697 if (!dev->interrupt_in_buffer) {
698 dev_err(&intf->dev, "Couldn't allocate interrupt_in_buffer\n");
699 goto error;
700 }
701 dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
702 if (!dev->interrupt_in_urb) {
703 dev_err(&intf->dev, "Couldn't allocate interrupt_in_urb\n");
704 goto error;
705 }
706 dev->interrupt_out_endpoint_size = dev->interrupt_out_endpoint ? le16_to_cpu(dev->interrupt_out_endpoint->wMaxPacketSize) :
707 udev->descriptor.bMaxPacketSize0;
708 dev->interrupt_out_buffer = kmalloc(write_buffer_size*dev->interrupt_out_endpoint_size, GFP_KERNEL);
709 if (!dev->interrupt_out_buffer) {
710 dev_err(&intf->dev, "Couldn't allocate interrupt_out_buffer\n");
711 goto error;
712 }
713 dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
714 if (!dev->interrupt_out_urb) {
715 dev_err(&intf->dev, "Couldn't allocate interrupt_out_urb\n");
716 goto error;
717 }
718 dev->interrupt_in_interval = min_interrupt_in_interval > dev->interrupt_in_endpoint->bInterval ? min_interrupt_in_interval : dev->interrupt_in_endpoint->bInterval;
719 if (dev->interrupt_out_endpoint)
720 dev->interrupt_out_interval = min_interrupt_out_interval > dev->interrupt_out_endpoint->bInterval ? min_interrupt_out_interval : dev->interrupt_out_endpoint->bInterval;
721
722 /* we can register the device now, as it is ready */
723 usb_set_intfdata(intf, dev);
724
725 retval = usb_register_dev(intf, &ld_usb_class);
726 if (retval) {
727 /* something prevented us from registering this driver */
728 dev_err(&intf->dev, "Not able to get a minor for this device.\n");
729 usb_set_intfdata(intf, NULL);
730 goto error;
731 }
732
733 /* let the user know what node this device is now attached to */
734 dev_info(&intf->dev, "LD USB Device #%d now attached to major %d minor %d\n",
735 (intf->minor - USB_LD_MINOR_BASE), USB_MAJOR, intf->minor);
736
737 exit:
738 return retval;
739
740 error:
741 ld_usb_delete(dev);
742
743 return retval;
744 }
745
746 /**
747 * ld_usb_disconnect
748 *
749 * Called by the usb core when the device is removed from the system.
750 */
751 static void ld_usb_disconnect(struct usb_interface *intf)
752 {
753 struct ld_usb *dev;
754 int minor;
755
756 dev = usb_get_intfdata(intf);
757 usb_set_intfdata(intf, NULL);
758
759 minor = intf->minor;
760
761 /* give back our minor */
762 usb_deregister_dev(intf, &ld_usb_class);
763
764 down(&dev->sem);
765
766 /* if the device is not opened, then we clean up right now */
767 if (!dev->open_count) {
768 up(&dev->sem);
769 ld_usb_delete(dev);
770 } else {
771 dev->intf = NULL;
772 up(&dev->sem);
773 }
774
775 dev_info(&intf->dev, "LD USB Device #%d now disconnected\n",
776 (minor - USB_LD_MINOR_BASE));
777 }
778
779 /* usb specific object needed to register this driver with the usb subsystem */
780 static struct usb_driver ld_usb_driver = {
781 .name = "ldusb",
782 .probe = ld_usb_probe,
783 .disconnect = ld_usb_disconnect,
784 .id_table = ld_usb_table,
785 };
786
787 /**
788 * ld_usb_init
789 */
790 static int __init ld_usb_init(void)
791 {
792 int retval;
793
794 /* register this driver with the USB subsystem */
795 retval = usb_register(&ld_usb_driver);
796 if (retval)
797 err("usb_register failed for the "__FILE__" driver. Error number %d\n", retval);
798
799 return retval;
800 }
801
802 /**
803 * ld_usb_exit
804 */
805 static void __exit ld_usb_exit(void)
806 {
807 /* deregister this driver with the USB subsystem */
808 usb_deregister(&ld_usb_driver);
809 }
810
811 module_init(ld_usb_init);
812 module_exit(ld_usb_exit);
813
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