?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
USB: add USB-Persist facility
[linux-2.6.git] / drivers / usb / misc / ldusb.c
blob7bad494047621a38f61bd8cf90057f2d40870ea7
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 /* prevent races between open() and disconnect() */
180 static DEFINE_MUTEX(disconnect_mutex);
181
182 static struct usb_driver ld_usb_driver;
183
184 /**
185 * ld_usb_abort_transfers
186 * aborts transfers and frees associated data structures
187 */
188 static void ld_usb_abort_transfers(struct ld_usb *dev)
189 {
190 /* shutdown transfer */
191 if (dev->interrupt_in_running) {
192 dev->interrupt_in_running = 0;
193 if (dev->intf)
194 usb_kill_urb(dev->interrupt_in_urb);
195 }
196 if (dev->interrupt_out_busy)
197 if (dev->intf)
198 usb_kill_urb(dev->interrupt_out_urb);
199 }
200
201 /**
202 * ld_usb_delete
203 */
204 static void ld_usb_delete(struct ld_usb *dev)
205 {
206 ld_usb_abort_transfers(dev);
207
208 /* free data structures */
209 usb_free_urb(dev->interrupt_in_urb);
210 usb_free_urb(dev->interrupt_out_urb);
211 kfree(dev->ring_buffer);
212 kfree(dev->interrupt_in_buffer);
213 kfree(dev->interrupt_out_buffer);
214 kfree(dev);
215 }
216
217 /**
218 * ld_usb_interrupt_in_callback
219 */
220 static void ld_usb_interrupt_in_callback(struct urb *urb)
221 {
222 struct ld_usb *dev = urb->context;
223 size_t *actual_buffer;
224 unsigned int next_ring_head;
225 int retval;
226
227 if (urb->status) {
228 if (urb->status == -ENOENT ||
229 urb->status == -ECONNRESET ||
230 urb->status == -ESHUTDOWN) {
231 goto exit;
232 } else {
233 dbg_info(&dev->intf->dev, "%s: nonzero status received: %d\n",
234 __FUNCTION__, urb->status);
235 spin_lock(&dev->rbsl);
236 goto resubmit; /* maybe we can recover */
237 }
238 }
239
240 spin_lock(&dev->rbsl);
241 if (urb->actual_length > 0) {
242 next_ring_head = (dev->ring_head+1) % ring_buffer_size;
243 if (next_ring_head != dev->ring_tail) {
244 actual_buffer = (size_t*)(dev->ring_buffer + dev->ring_head*(sizeof(size_t)+dev->interrupt_in_endpoint_size));
245 /* actual_buffer gets urb->actual_length + interrupt_in_buffer */
246 *actual_buffer = urb->actual_length;
247 memcpy(actual_buffer+1, dev->interrupt_in_buffer, urb->actual_length);
248 dev->ring_head = next_ring_head;
249 dbg_info(&dev->intf->dev, "%s: received %d bytes\n",
250 __FUNCTION__, urb->actual_length);
251 } else {
252 dev_warn(&dev->intf->dev,
253 "Ring buffer overflow, %d bytes dropped\n",
254 urb->actual_length);
255 dev->buffer_overflow = 1;
256 }
257 }
258
259 resubmit:
260 /* resubmit if we're still running */
261 if (dev->interrupt_in_running && !dev->buffer_overflow && dev->intf) {
262 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_ATOMIC);
263 if (retval) {
264 dev_err(&dev->intf->dev,
265 "usb_submit_urb failed (%d)\n", retval);
266 dev->buffer_overflow = 1;
267 }
268 }
269 spin_unlock(&dev->rbsl);
270 exit:
271 dev->interrupt_in_done = 1;
272 wake_up_interruptible(&dev->read_wait);
273 }
274
275 /**
276 * ld_usb_interrupt_out_callback
277 */
278 static void ld_usb_interrupt_out_callback(struct urb *urb)
279 {
280 struct ld_usb *dev = urb->context;
281
282 /* sync/async unlink faults aren't errors */
283 if (urb->status && !(urb->status == -ENOENT ||
284 urb->status == -ECONNRESET ||
285 urb->status == -ESHUTDOWN))
286 dbg_info(&dev->intf->dev,
287 "%s - nonzero write interrupt status received: %d\n",
288 __FUNCTION__, urb->status);
289
290 dev->interrupt_out_busy = 0;
291 wake_up_interruptible(&dev->write_wait);
292 }
293
294 /**
295 * ld_usb_open
296 */
297 static int ld_usb_open(struct inode *inode, struct file *file)
298 {
299 struct ld_usb *dev;
300 int subminor;
301 int retval = 0;
302 struct usb_interface *interface;
303
304 nonseekable_open(inode, file);
305 subminor = iminor(inode);
306
307 mutex_lock(&disconnect_mutex);
308
309 interface = usb_find_interface(&ld_usb_driver, subminor);
310
311 if (!interface) {
312 err("%s - error, can't find device for minor %d\n",
313 __FUNCTION__, subminor);
314 retval = -ENODEV;
315 goto unlock_disconnect_exit;
316 }
317
318 dev = usb_get_intfdata(interface);
319
320 if (!dev) {
321 retval = -ENODEV;
322 goto unlock_disconnect_exit;
323 }
324
325 /* lock this device */
326 if (down_interruptible(&dev->sem)) {
327 retval = -ERESTARTSYS;
328 goto unlock_disconnect_exit;
329 }
330
331 /* allow opening only once */
332 if (dev->open_count) {
333 retval = -EBUSY;
334 goto unlock_exit;
335 }
336 dev->open_count = 1;
337
338 /* initialize in direction */
339 dev->ring_head = 0;
340 dev->ring_tail = 0;
341 dev->buffer_overflow = 0;
342 usb_fill_int_urb(dev->interrupt_in_urb,
343 interface_to_usbdev(interface),
344 usb_rcvintpipe(interface_to_usbdev(interface),
345 dev->interrupt_in_endpoint->bEndpointAddress),
346 dev->interrupt_in_buffer,
347 dev->interrupt_in_endpoint_size,
348 ld_usb_interrupt_in_callback,
349 dev,
350 dev->interrupt_in_interval);
351
352 dev->interrupt_in_running = 1;
353 dev->interrupt_in_done = 0;
354
355 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
356 if (retval) {
357 dev_err(&interface->dev, "Couldn't submit interrupt_in_urb %d\n", retval);
358 dev->interrupt_in_running = 0;
359 dev->open_count = 0;
360 goto unlock_exit;
361 }
362
363 /* save device in the file's private structure */
364 file->private_data = dev;
365
366 unlock_exit:
367 up(&dev->sem);
368
369 unlock_disconnect_exit:
370 mutex_unlock(&disconnect_mutex);
371
372 return retval;
373 }
374
375 /**
376 * ld_usb_release
377 */
378 static int ld_usb_release(struct inode *inode, struct file *file)
379 {
380 struct ld_usb *dev;
381 int retval = 0;
382
383 dev = file->private_data;
384
385 if (dev == NULL) {
386 retval = -ENODEV;
387 goto exit;
388 }
389
390 if (down_interruptible(&dev->sem)) {
391 retval = -ERESTARTSYS;
392 goto exit;
393 }
394
395 if (dev->open_count != 1) {
396 retval = -ENODEV;
397 goto unlock_exit;
398 }
399 if (dev->intf == NULL) {
400 /* the device was unplugged before the file was released */
401 up(&dev->sem);
402 /* unlock here as ld_usb_delete frees dev */
403 ld_usb_delete(dev);
404 goto exit;
405 }
406
407 /* wait until write transfer is finished */
408 if (dev->interrupt_out_busy)
409 wait_event_interruptible_timeout(dev->write_wait, !dev->interrupt_out_busy, 2 * HZ);
410 ld_usb_abort_transfers(dev);
411 dev->open_count = 0;
412
413 unlock_exit:
414 up(&dev->sem);
415
416 exit:
417 return retval;
418 }
419
420 /**
421 * ld_usb_poll
422 */
423 static unsigned int ld_usb_poll(struct file *file, poll_table *wait)
424 {
425 struct ld_usb *dev;
426 unsigned int mask = 0;
427
428 dev = file->private_data;
429
430 poll_wait(file, &dev->read_wait, wait);
431 poll_wait(file, &dev->write_wait, wait);
432
433 if (dev->ring_head != dev->ring_tail)
434 mask |= POLLIN | POLLRDNORM;
435 if (!dev->interrupt_out_busy)
436 mask |= POLLOUT | POLLWRNORM;
437
438 return mask;
439 }
440
441 /**
442 * ld_usb_read
443 */
444 static ssize_t ld_usb_read(struct file *file, char __user *buffer, size_t count,
445 loff_t *ppos)
446 {
447 struct ld_usb *dev;
448 size_t *actual_buffer;
449 size_t bytes_to_read;
450 int retval = 0;
451 int rv;
452
453 dev = file->private_data;
454
455 /* verify that we actually have some data to read */
456 if (count == 0)
457 goto exit;
458
459 /* lock this object */
460 if (down_interruptible(&dev->sem)) {
461 retval = -ERESTARTSYS;
462 goto exit;
463 }
464
465 /* verify that the device wasn't unplugged */
466 if (dev->intf == NULL) {
467 retval = -ENODEV;
468 err("No device or device unplugged %d\n", retval);
469 goto unlock_exit;
470 }
471
472 /* wait for data */
473 spin_lock_irq(&dev->rbsl);
474 if (dev->ring_head == dev->ring_tail) {
475 dev->interrupt_in_done = 0;
476 spin_unlock_irq(&dev->rbsl);
477 if (file->f_flags & O_NONBLOCK) {
478 retval = -EAGAIN;
479 goto unlock_exit;
480 }
481 retval = wait_event_interruptible(dev->read_wait, dev->interrupt_in_done);
482 if (retval < 0)
483 goto unlock_exit;
484 } else {
485 spin_unlock_irq(&dev->rbsl);
486 }
487
488 /* actual_buffer contains actual_length + interrupt_in_buffer */
489 actual_buffer = (size_t*)(dev->ring_buffer + dev->ring_tail*(sizeof(size_t)+dev->interrupt_in_endpoint_size));
490 bytes_to_read = min(count, *actual_buffer);
491 if (bytes_to_read < *actual_buffer)
492 dev_warn(&dev->intf->dev, "Read buffer overflow, %zd bytes dropped\n",
493 *actual_buffer-bytes_to_read);
494
495 /* copy one interrupt_in_buffer from ring_buffer into userspace */
496 if (copy_to_user(buffer, actual_buffer+1, bytes_to_read)) {
497 retval = -EFAULT;
498 goto unlock_exit;
499 }
500 dev->ring_tail = (dev->ring_tail+1) % ring_buffer_size;
501
502 retval = bytes_to_read;
503
504 spin_lock_irq(&dev->rbsl);
505 if (dev->buffer_overflow) {
506 dev->buffer_overflow = 0;
507 spin_unlock_irq(&dev->rbsl);
508 rv = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
509 if (rv < 0)
510 dev->buffer_overflow = 1;
511 } else {
512 spin_unlock_irq(&dev->rbsl);
513 }
514
515 unlock_exit:
516 /* unlock the device */
517 up(&dev->sem);
518
519 exit:
520 return retval;
521 }
522
523 /**
524 * ld_usb_write
525 */
526 static ssize_t ld_usb_write(struct file *file, const char __user *buffer,
527 size_t count, loff_t *ppos)
528 {
529 struct ld_usb *dev;
530 size_t bytes_to_write;
531 int retval = 0;
532
533 dev = file->private_data;
534
535 /* verify that we actually have some data to write */
536 if (count == 0)
537 goto exit;
538
539 /* lock this object */
540 if (down_interruptible(&dev->sem)) {
541 retval = -ERESTARTSYS;
542 goto exit;
543 }
544
545 /* verify that the device wasn't unplugged */
546 if (dev->intf == NULL) {
547 retval = -ENODEV;
548 err("No device or device unplugged %d\n", retval);
549 goto unlock_exit;
550 }
551
552 /* wait until previous transfer is finished */
553 if (dev->interrupt_out_busy) {
554 if (file->f_flags & O_NONBLOCK) {
555 retval = -EAGAIN;
556 goto unlock_exit;
557 }
558 retval = wait_event_interruptible(dev->write_wait, !dev->interrupt_out_busy);
559 if (retval < 0) {
560 goto unlock_exit;
561 }
562 }
563
564 /* write the data into interrupt_out_buffer from userspace */
565 bytes_to_write = min(count, write_buffer_size*dev->interrupt_out_endpoint_size);
566 if (bytes_to_write < count)
567 dev_warn(&dev->intf->dev, "Write buffer overflow, %zd bytes dropped\n",count-bytes_to_write);
568 dbg_info(&dev->intf->dev, "%s: count = %zd, bytes_to_write = %zd\n", __FUNCTION__, count, bytes_to_write);
569
570 if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write)) {
571 retval = -EFAULT;
572 goto unlock_exit;
573 }
574
575 if (dev->interrupt_out_endpoint == NULL) {
576 /* try HID_REQ_SET_REPORT=9 on control_endpoint instead of interrupt_out_endpoint */
577 retval = usb_control_msg(interface_to_usbdev(dev->intf),
578 usb_sndctrlpipe(interface_to_usbdev(dev->intf), 0),
579 9,
580 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
581 1 << 8, 0,
582 dev->interrupt_out_buffer,
583 bytes_to_write,
584 USB_CTRL_SET_TIMEOUT * HZ);
585 if (retval < 0)
586 err("Couldn't submit HID_REQ_SET_REPORT %d\n", retval);
587 goto unlock_exit;
588 }
589
590 /* send off the urb */
591 usb_fill_int_urb(dev->interrupt_out_urb,
592 interface_to_usbdev(dev->intf),
593 usb_sndintpipe(interface_to_usbdev(dev->intf),
594 dev->interrupt_out_endpoint->bEndpointAddress),
595 dev->interrupt_out_buffer,
596 bytes_to_write,
597 ld_usb_interrupt_out_callback,
598 dev,
599 dev->interrupt_out_interval);
600
601 dev->interrupt_out_busy = 1;
602 wmb();
603
604 retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL);
605 if (retval) {
606 dev->interrupt_out_busy = 0;
607 err("Couldn't submit interrupt_out_urb %d\n", retval);
608 goto unlock_exit;
609 }
610 retval = bytes_to_write;
611
612 unlock_exit:
613 /* unlock the device */
614 up(&dev->sem);
615
616 exit:
617 return retval;
618 }
619
620 /* file operations needed when we register this driver */
621 static const struct file_operations ld_usb_fops = {
622 .owner = THIS_MODULE,
623 .read = ld_usb_read,
624 .write = ld_usb_write,
625 .open = ld_usb_open,
626 .release = ld_usb_release,
627 .poll = ld_usb_poll,
628 };
629
630 /*
631 * usb class driver info in order to get a minor number from the usb core,
632 * and to have the device registered with the driver core
633 */
634 static struct usb_class_driver ld_usb_class = {
635 .name = "ldusb%d",
636 .fops = &ld_usb_fops,
637 .minor_base = USB_LD_MINOR_BASE,
638 };
639
640 /**
641 * ld_usb_probe
642 *
643 * Called by the usb core when a new device is connected that it thinks
644 * this driver might be interested in.
645 */
646 static int ld_usb_probe(struct usb_interface *intf, const struct usb_device_id *id)
647 {
648 struct usb_device *udev = interface_to_usbdev(intf);
649 struct ld_usb *dev = NULL;
650 struct usb_host_interface *iface_desc;
651 struct usb_endpoint_descriptor *endpoint;
652 char *buffer;
653 int i;
654 int retval = -ENOMEM;
655
656 /* allocate memory for our device state and intialize it */
657
658 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
659 if (dev == NULL) {
660 dev_err(&intf->dev, "Out of memory\n");
661 goto exit;
662 }
663 init_MUTEX(&dev->sem);
664 spin_lock_init(&dev->rbsl);
665 dev->intf = intf;
666 init_waitqueue_head(&dev->read_wait);
667 init_waitqueue_head(&dev->write_wait);
668
669 /* workaround for early firmware versions on fast computers */
670 if ((le16_to_cpu(udev->descriptor.idVendor) == USB_VENDOR_ID_LD) &&
671 ((le16_to_cpu(udev->descriptor.idProduct) == USB_DEVICE_ID_LD_CASSY) ||
672 (le16_to_cpu(udev->descriptor.idProduct) == USB_DEVICE_ID_LD_COM3LAB)) &&
673 (le16_to_cpu(udev->descriptor.bcdDevice) <= 0x103)) {
674 buffer = kmalloc(256, GFP_KERNEL);
675 if (buffer == NULL) {
676 dev_err(&intf->dev, "Couldn't allocate string buffer\n");
677 goto error;
678 }
679 /* usb_string makes SETUP+STALL to leave always ControlReadLoop */
680 usb_string(udev, 255, buffer, 256);
681 kfree(buffer);
682 }
683
684 iface_desc = intf->cur_altsetting;
685
686 /* set up the endpoint information */
687 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
688 endpoint = &iface_desc->endpoint[i].desc;
689
690 if (usb_endpoint_is_int_in(endpoint))
691 dev->interrupt_in_endpoint = endpoint;
692
693 if (usb_endpoint_is_int_out(endpoint))
694 dev->interrupt_out_endpoint = endpoint;
695 }
696 if (dev->interrupt_in_endpoint == NULL) {
697 dev_err(&intf->dev, "Interrupt in endpoint not found\n");
698 goto error;
699 }
700 if (dev->interrupt_out_endpoint == NULL)
701 dev_warn(&intf->dev, "Interrupt out endpoint not found (using control endpoint instead)\n");
702
703 dev->interrupt_in_endpoint_size = le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize);
704 dev->ring_buffer = kmalloc(ring_buffer_size*(sizeof(size_t)+dev->interrupt_in_endpoint_size), GFP_KERNEL);
705 if (!dev->ring_buffer) {
706 dev_err(&intf->dev, "Couldn't allocate ring_buffer\n");
707 goto error;
708 }
709 dev->interrupt_in_buffer = kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL);
710 if (!dev->interrupt_in_buffer) {
711 dev_err(&intf->dev, "Couldn't allocate interrupt_in_buffer\n");
712 goto error;
713 }
714 dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
715 if (!dev->interrupt_in_urb) {
716 dev_err(&intf->dev, "Couldn't allocate interrupt_in_urb\n");
717 goto error;
718 }
719 dev->interrupt_out_endpoint_size = dev->interrupt_out_endpoint ? le16_to_cpu(dev->interrupt_out_endpoint->wMaxPacketSize) :
720 udev->descriptor.bMaxPacketSize0;
721 dev->interrupt_out_buffer = kmalloc(write_buffer_size*dev->interrupt_out_endpoint_size, GFP_KERNEL);
722 if (!dev->interrupt_out_buffer) {
723 dev_err(&intf->dev, "Couldn't allocate interrupt_out_buffer\n");
724 goto error;
725 }
726 dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
727 if (!dev->interrupt_out_urb) {
728 dev_err(&intf->dev, "Couldn't allocate interrupt_out_urb\n");
729 goto error;
730 }
731 dev->interrupt_in_interval = min_interrupt_in_interval > dev->interrupt_in_endpoint->bInterval ? min_interrupt_in_interval : dev->interrupt_in_endpoint->bInterval;
732 if (dev->interrupt_out_endpoint)
733 dev->interrupt_out_interval = min_interrupt_out_interval > dev->interrupt_out_endpoint->bInterval ? min_interrupt_out_interval : dev->interrupt_out_endpoint->bInterval;
734
735 /* we can register the device now, as it is ready */
736 usb_set_intfdata(intf, dev);
737
738 retval = usb_register_dev(intf, &ld_usb_class);
739 if (retval) {
740 /* something prevented us from registering this driver */
741 dev_err(&intf->dev, "Not able to get a minor for this device.\n");
742 usb_set_intfdata(intf, NULL);
743 goto error;
744 }
745
746 /* let the user know what node this device is now attached to */
747 dev_info(&intf->dev, "LD USB Device #%d now attached to major %d minor %d\n",
748 (intf->minor - USB_LD_MINOR_BASE), USB_MAJOR, intf->minor);
749
750 exit:
751 return retval;
752
753 error:
754 ld_usb_delete(dev);
755
756 return retval;
757 }
758
759 /**
760 * ld_usb_disconnect
761 *
762 * Called by the usb core when the device is removed from the system.
763 */
764 static void ld_usb_disconnect(struct usb_interface *intf)
765 {
766 struct ld_usb *dev;
767 int minor;
768
769 mutex_lock(&disconnect_mutex);
770
771 dev = usb_get_intfdata(intf);
772 usb_set_intfdata(intf, NULL);
773
774 down(&dev->sem);
775
776 minor = intf->minor;
777
778 /* give back our minor */
779 usb_deregister_dev(intf, &ld_usb_class);
780
781 /* if the device is not opened, then we clean up right now */
782 if (!dev->open_count) {
783 up(&dev->sem);
784 ld_usb_delete(dev);
785 } else {
786 dev->intf = NULL;
787 up(&dev->sem);
788 }
789
790 mutex_unlock(&disconnect_mutex);
791
792 dev_info(&intf->dev, "LD USB Device #%d now disconnected\n",
793 (minor - USB_LD_MINOR_BASE));
794 }
795
796 /* usb specific object needed to register this driver with the usb subsystem */
797 static struct usb_driver ld_usb_driver = {
798 .name = "ldusb",
799 .probe = ld_usb_probe,
800 .disconnect = ld_usb_disconnect,
801 .id_table = ld_usb_table,
802 };
803
804 /**
805 * ld_usb_init
806 */
807 static int __init ld_usb_init(void)
808 {
809 int retval;
810
811 /* register this driver with the USB subsystem */
812 retval = usb_register(&ld_usb_driver);
813 if (retval)
814 err("usb_register failed for the "__FILE__" driver. Error number %d\n", retval);
815
816 return retval;
817 }
818
819 /**
820 * ld_usb_exit
821 */
822 static void __exit ld_usb_exit(void)
823 {
824 /* deregister this driver with the USB subsystem */
825 usb_deregister(&ld_usb_driver);
826 }
827
828 module_init(ld_usb_init);
829 module_exit(ld_usb_exit);
830
Linus' kernel tree