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Merge tag 'gpio-v3.13-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw...
[linux-2.6.git] / drivers / usb / misc / ldusb.c
blobb1d59532ac2255e530a35f93d0055894f9f4fbfa
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
25 #include <linux/kernel.h>
26 #include <linux/errno.h>
27 #include <linux/init.h>
28 #include <linux/slab.h>
29 #include <linux/module.h>
30 #include <linux/mutex.h>
31
32 #include <asm/uaccess.h>
33 #include <linux/input.h>
34 #include <linux/usb.h>
35 #include <linux/poll.h>
36
37 /* Define these values to match your devices */
38 #define USB_VENDOR_ID_LD 0x0f11 /* USB Vendor ID of LD Didactic GmbH */
39 #define USB_DEVICE_ID_LD_CASSY 0x1000 /* USB Product ID of CASSY-S modules with 8 bytes endpoint size */
40 #define USB_DEVICE_ID_LD_CASSY2 0x1001 /* USB Product ID of CASSY-S modules with 64 bytes endpoint size */
41 #define USB_DEVICE_ID_LD_POCKETCASSY 0x1010 /* USB Product ID of Pocket-CASSY */
42 #define USB_DEVICE_ID_LD_POCKETCASSY2 0x1011 /* USB Product ID of Pocket-CASSY 2 (reserved) */
43 #define USB_DEVICE_ID_LD_MOBILECASSY 0x1020 /* USB Product ID of Mobile-CASSY */
44 #define USB_DEVICE_ID_LD_MOBILECASSY2 0x1021 /* USB Product ID of Mobile-CASSY 2 (reserved) */
45 #define USB_DEVICE_ID_LD_MICROCASSYVOLTAGE 0x1031 /* USB Product ID of Micro-CASSY Voltage */
46 #define USB_DEVICE_ID_LD_MICROCASSYCURRENT 0x1032 /* USB Product ID of Micro-CASSY Current */
47 #define USB_DEVICE_ID_LD_MICROCASSYTIME 0x1033 /* USB Product ID of Micro-CASSY Time (reserved) */
48 #define USB_DEVICE_ID_LD_MICROCASSYTEMPERATURE 0x1035 /* USB Product ID of Micro-CASSY Temperature */
49 #define USB_DEVICE_ID_LD_MICROCASSYPH 0x1038 /* USB Product ID of Micro-CASSY pH */
50 #define USB_DEVICE_ID_LD_JWM 0x1080 /* USB Product ID of Joule and Wattmeter */
51 #define USB_DEVICE_ID_LD_DMMP 0x1081 /* USB Product ID of Digital Multimeter P (reserved) */
52 #define USB_DEVICE_ID_LD_UMIP 0x1090 /* USB Product ID of UMI P */
53 #define USB_DEVICE_ID_LD_UMIC 0x10A0 /* USB Product ID of UMI C */
54 #define USB_DEVICE_ID_LD_UMIB 0x10B0 /* USB Product ID of UMI B */
55 #define USB_DEVICE_ID_LD_XRAY 0x1100 /* USB Product ID of X-Ray Apparatus 55481 */
56 #define USB_DEVICE_ID_LD_XRAY2 0x1101 /* USB Product ID of X-Ray Apparatus 554800 */
57 #define USB_DEVICE_ID_LD_XRAYCT 0x1110 /* USB Product ID of X-Ray Apparatus CT 554821*/
58 #define USB_DEVICE_ID_LD_VIDEOCOM 0x1200 /* USB Product ID of VideoCom */
59 #define USB_DEVICE_ID_LD_MOTOR 0x1210 /* USB Product ID of Motor (reserved) */
60 #define USB_DEVICE_ID_LD_COM3LAB 0x2000 /* USB Product ID of COM3LAB */
61 #define USB_DEVICE_ID_LD_TELEPORT 0x2010 /* USB Product ID of Terminal Adapter */
62 #define USB_DEVICE_ID_LD_NETWORKANALYSER 0x2020 /* USB Product ID of Network Analyser */
63 #define USB_DEVICE_ID_LD_POWERCONTROL 0x2030 /* USB Product ID of Converter Control Unit */
64 #define USB_DEVICE_ID_LD_MACHINETEST 0x2040 /* USB Product ID of Machine Test System */
65 #define USB_DEVICE_ID_LD_MOSTANALYSER 0x2050 /* USB Product ID of MOST Protocol Analyser */
66 #define USB_DEVICE_ID_LD_MOSTANALYSER2 0x2051 /* USB Product ID of MOST Protocol Analyser 2 */
67 #define USB_DEVICE_ID_LD_ABSESP 0x2060 /* USB Product ID of ABS ESP */
68 #define USB_DEVICE_ID_LD_AUTODATABUS 0x2070 /* USB Product ID of Automotive Data Buses */
69 #define USB_DEVICE_ID_LD_MCT 0x2080 /* USB Product ID of Microcontroller technique */
70 #define USB_DEVICE_ID_LD_HYBRID 0x2090 /* USB Product ID of Automotive Hybrid */
71 #define USB_DEVICE_ID_LD_HEATCONTROL 0x20A0 /* USB Product ID of Heat control */
72
73 #define USB_VENDOR_ID_VERNIER 0x08f7
74 #define USB_DEVICE_ID_VERNIER_GOTEMP 0x0002
75 #define USB_DEVICE_ID_VERNIER_SKIP 0x0003
76 #define USB_DEVICE_ID_VERNIER_CYCLOPS 0x0004
77 #define USB_DEVICE_ID_VERNIER_LCSPEC 0x0006
78
79 #ifdef CONFIG_USB_DYNAMIC_MINORS
80 #define USB_LD_MINOR_BASE 0
81 #else
82 #define USB_LD_MINOR_BASE 176
83 #endif
84
85 /* table of devices that work with this driver */
86 static const struct usb_device_id ld_usb_table[] = {
87 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_CASSY) },
88 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_CASSY2) },
89 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POCKETCASSY) },
90 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POCKETCASSY2) },
91 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOBILECASSY) },
92 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOBILECASSY2) },
93 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYVOLTAGE) },
94 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYCURRENT) },
95 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYTIME) },
96 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYTEMPERATURE) },
97 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYPH) },
98 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_JWM) },
99 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_DMMP) },
100 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_UMIP) },
101 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_UMIC) },
102 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_UMIB) },
103 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_XRAY) },
104 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_XRAY2) },
105 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_VIDEOCOM) },
106 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOTOR) },
107 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_COM3LAB) },
108 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_TELEPORT) },
109 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_NETWORKANALYSER) },
110 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POWERCONTROL) },
111 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MACHINETEST) },
112 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOSTANALYSER) },
113 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOSTANALYSER2) },
114 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_ABSESP) },
115 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_AUTODATABUS) },
116 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MCT) },
117 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_HYBRID) },
118 { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_HEATCONTROL) },
119 { USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_GOTEMP) },
120 { USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_SKIP) },
121 { USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_CYCLOPS) },
122 { USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_LCSPEC) },
123 { } /* Terminating entry */
124 };
125 MODULE_DEVICE_TABLE(usb, ld_usb_table);
126 MODULE_VERSION("V0.14");
127 MODULE_AUTHOR("Michael Hund <mhund@ld-didactic.de>");
128 MODULE_DESCRIPTION("LD USB Driver");
129 MODULE_LICENSE("GPL");
130 MODULE_SUPPORTED_DEVICE("LD USB Devices");
131
132 /* All interrupt in transfers are collected in a ring buffer to
133 * avoid racing conditions and get better performance of the driver.
134 */
135 static int ring_buffer_size = 128;
136 module_param(ring_buffer_size, int, 0);
137 MODULE_PARM_DESC(ring_buffer_size, "Read ring buffer size in reports");
138
139 /* The write_buffer can contain more than one interrupt out transfer.
140 */
141 static int write_buffer_size = 10;
142 module_param(write_buffer_size, int, 0);
143 MODULE_PARM_DESC(write_buffer_size, "Write buffer size in reports");
144
145 /* As of kernel version 2.6.4 ehci-hcd uses an
146 * "only one interrupt transfer per frame" shortcut
147 * to simplify the scheduling of periodic transfers.
148 * This conflicts with our standard 1ms intervals for in and out URBs.
149 * We use default intervals of 2ms for in and 2ms for out transfers,
150 * which should be fast enough.
151 * Increase the interval to allow more devices that do interrupt transfers,
152 * or set to 1 to use the standard interval from the endpoint descriptors.
153 */
154 static int min_interrupt_in_interval = 2;
155 module_param(min_interrupt_in_interval, int, 0);
156 MODULE_PARM_DESC(min_interrupt_in_interval, "Minimum interrupt in interval in ms");
157
158 static int min_interrupt_out_interval = 2;
159 module_param(min_interrupt_out_interval, int, 0);
160 MODULE_PARM_DESC(min_interrupt_out_interval, "Minimum interrupt out interval in ms");
161
162 /* Structure to hold all of our device specific stuff */
163 struct ld_usb {
164 struct mutex mutex; /* locks this structure */
165 struct usb_interface* intf; /* save off the usb interface pointer */
166
167 int open_count; /* number of times this port has been opened */
168
169 char* ring_buffer;
170 unsigned int ring_head;
171 unsigned int ring_tail;
172
173 wait_queue_head_t read_wait;
174 wait_queue_head_t write_wait;
175
176 char* interrupt_in_buffer;
177 struct usb_endpoint_descriptor* interrupt_in_endpoint;
178 struct urb* interrupt_in_urb;
179 int interrupt_in_interval;
180 size_t interrupt_in_endpoint_size;
181 int interrupt_in_running;
182 int interrupt_in_done;
183 int buffer_overflow;
184 spinlock_t rbsl;
185
186 char* interrupt_out_buffer;
187 struct usb_endpoint_descriptor* interrupt_out_endpoint;
188 struct urb* interrupt_out_urb;
189 int interrupt_out_interval;
190 size_t interrupt_out_endpoint_size;
191 int interrupt_out_busy;
192 };
193
194 static struct usb_driver ld_usb_driver;
195
196 /**
197 * ld_usb_abort_transfers
198 * aborts transfers and frees associated data structures
199 */
200 static void ld_usb_abort_transfers(struct ld_usb *dev)
201 {
202 /* shutdown transfer */
203 if (dev->interrupt_in_running) {
204 dev->interrupt_in_running = 0;
205 if (dev->intf)
206 usb_kill_urb(dev->interrupt_in_urb);
207 }
208 if (dev->interrupt_out_busy)
209 if (dev->intf)
210 usb_kill_urb(dev->interrupt_out_urb);
211 }
212
213 /**
214 * ld_usb_delete
215 */
216 static void ld_usb_delete(struct ld_usb *dev)
217 {
218 ld_usb_abort_transfers(dev);
219
220 /* free data structures */
221 usb_free_urb(dev->interrupt_in_urb);
222 usb_free_urb(dev->interrupt_out_urb);
223 kfree(dev->ring_buffer);
224 kfree(dev->interrupt_in_buffer);
225 kfree(dev->interrupt_out_buffer);
226 kfree(dev);
227 }
228
229 /**
230 * ld_usb_interrupt_in_callback
231 */
232 static void ld_usb_interrupt_in_callback(struct urb *urb)
233 {
234 struct ld_usb *dev = urb->context;
235 size_t *actual_buffer;
236 unsigned int next_ring_head;
237 int status = urb->status;
238 int retval;
239
240 if (status) {
241 if (status == -ENOENT ||
242 status == -ECONNRESET ||
243 status == -ESHUTDOWN) {
244 goto exit;
245 } else {
246 dev_dbg(&dev->intf->dev,
247 "%s: nonzero status received: %d\n", __func__,
248 status);
249 spin_lock(&dev->rbsl);
250 goto resubmit; /* maybe we can recover */
251 }
252 }
253
254 spin_lock(&dev->rbsl);
255 if (urb->actual_length > 0) {
256 next_ring_head = (dev->ring_head+1) % ring_buffer_size;
257 if (next_ring_head != dev->ring_tail) {
258 actual_buffer = (size_t*)(dev->ring_buffer + dev->ring_head*(sizeof(size_t)+dev->interrupt_in_endpoint_size));
259 /* actual_buffer gets urb->actual_length + interrupt_in_buffer */
260 *actual_buffer = urb->actual_length;
261 memcpy(actual_buffer+1, dev->interrupt_in_buffer, urb->actual_length);
262 dev->ring_head = next_ring_head;
263 dev_dbg(&dev->intf->dev, "%s: received %d bytes\n",
264 __func__, urb->actual_length);
265 } else {
266 dev_warn(&dev->intf->dev,
267 "Ring buffer overflow, %d bytes dropped\n",
268 urb->actual_length);
269 dev->buffer_overflow = 1;
270 }
271 }
272
273 resubmit:
274 /* resubmit if we're still running */
275 if (dev->interrupt_in_running && !dev->buffer_overflow && dev->intf) {
276 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_ATOMIC);
277 if (retval) {
278 dev_err(&dev->intf->dev,
279 "usb_submit_urb failed (%d)\n", retval);
280 dev->buffer_overflow = 1;
281 }
282 }
283 spin_unlock(&dev->rbsl);
284 exit:
285 dev->interrupt_in_done = 1;
286 wake_up_interruptible(&dev->read_wait);
287 }
288
289 /**
290 * ld_usb_interrupt_out_callback
291 */
292 static void ld_usb_interrupt_out_callback(struct urb *urb)
293 {
294 struct ld_usb *dev = urb->context;
295 int status = urb->status;
296
297 /* sync/async unlink faults aren't errors */
298 if (status && !(status == -ENOENT ||
299 status == -ECONNRESET ||
300 status == -ESHUTDOWN))
301 dev_dbg(&dev->intf->dev,
302 "%s - nonzero write interrupt status received: %d\n",
303 __func__, status);
304
305 dev->interrupt_out_busy = 0;
306 wake_up_interruptible(&dev->write_wait);
307 }
308
309 /**
310 * ld_usb_open
311 */
312 static int ld_usb_open(struct inode *inode, struct file *file)
313 {
314 struct ld_usb *dev;
315 int subminor;
316 int retval;
317 struct usb_interface *interface;
318
319 nonseekable_open(inode, file);
320 subminor = iminor(inode);
321
322 interface = usb_find_interface(&ld_usb_driver, subminor);
323
324 if (!interface) {
325 printk(KERN_ERR "%s - error, can't find device for minor %d\n",
326 __func__, subminor);
327 return -ENODEV;
328 }
329
330 dev = usb_get_intfdata(interface);
331
332 if (!dev)
333 return -ENODEV;
334
335 /* lock this device */
336 if (mutex_lock_interruptible(&dev->mutex))
337 return -ERESTARTSYS;
338
339 /* allow opening only once */
340 if (dev->open_count) {
341 retval = -EBUSY;
342 goto unlock_exit;
343 }
344 dev->open_count = 1;
345
346 /* initialize in direction */
347 dev->ring_head = 0;
348 dev->ring_tail = 0;
349 dev->buffer_overflow = 0;
350 usb_fill_int_urb(dev->interrupt_in_urb,
351 interface_to_usbdev(interface),
352 usb_rcvintpipe(interface_to_usbdev(interface),
353 dev->interrupt_in_endpoint->bEndpointAddress),
354 dev->interrupt_in_buffer,
355 dev->interrupt_in_endpoint_size,
356 ld_usb_interrupt_in_callback,
357 dev,
358 dev->interrupt_in_interval);
359
360 dev->interrupt_in_running = 1;
361 dev->interrupt_in_done = 0;
362
363 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
364 if (retval) {
365 dev_err(&interface->dev, "Couldn't submit interrupt_in_urb %d\n", retval);
366 dev->interrupt_in_running = 0;
367 dev->open_count = 0;
368 goto unlock_exit;
369 }
370
371 /* save device in the file's private structure */
372 file->private_data = dev;
373
374 unlock_exit:
375 mutex_unlock(&dev->mutex);
376
377 return retval;
378 }
379
380 /**
381 * ld_usb_release
382 */
383 static int ld_usb_release(struct inode *inode, struct file *file)
384 {
385 struct ld_usb *dev;
386 int retval = 0;
387
388 dev = file->private_data;
389
390 if (dev == NULL) {
391 retval = -ENODEV;
392 goto exit;
393 }
394
395 if (mutex_lock_interruptible(&dev->mutex)) {
396 retval = -ERESTARTSYS;
397 goto exit;
398 }
399
400 if (dev->open_count != 1) {
401 retval = -ENODEV;
402 goto unlock_exit;
403 }
404 if (dev->intf == NULL) {
405 /* the device was unplugged before the file was released */
406 mutex_unlock(&dev->mutex);
407 /* unlock here as ld_usb_delete frees dev */
408 ld_usb_delete(dev);
409 goto exit;
410 }
411
412 /* wait until write transfer is finished */
413 if (dev->interrupt_out_busy)
414 wait_event_interruptible_timeout(dev->write_wait, !dev->interrupt_out_busy, 2 * HZ);
415 ld_usb_abort_transfers(dev);
416 dev->open_count = 0;
417
418 unlock_exit:
419 mutex_unlock(&dev->mutex);
420
421 exit:
422 return retval;
423 }
424
425 /**
426 * ld_usb_poll
427 */
428 static unsigned int ld_usb_poll(struct file *file, poll_table *wait)
429 {
430 struct ld_usb *dev;
431 unsigned int mask = 0;
432
433 dev = file->private_data;
434
435 if (!dev->intf)
436 return POLLERR | POLLHUP;
437
438 poll_wait(file, &dev->read_wait, wait);
439 poll_wait(file, &dev->write_wait, wait);
440
441 if (dev->ring_head != dev->ring_tail)
442 mask |= POLLIN | POLLRDNORM;
443 if (!dev->interrupt_out_busy)
444 mask |= POLLOUT | POLLWRNORM;
445
446 return mask;
447 }
448
449 /**
450 * ld_usb_read
451 */
452 static ssize_t ld_usb_read(struct file *file, char __user *buffer, size_t count,
453 loff_t *ppos)
454 {
455 struct ld_usb *dev;
456 size_t *actual_buffer;
457 size_t bytes_to_read;
458 int retval = 0;
459 int rv;
460
461 dev = file->private_data;
462
463 /* verify that we actually have some data to read */
464 if (count == 0)
465 goto exit;
466
467 /* lock this object */
468 if (mutex_lock_interruptible(&dev->mutex)) {
469 retval = -ERESTARTSYS;
470 goto exit;
471 }
472
473 /* verify that the device wasn't unplugged */
474 if (dev->intf == NULL) {
475 retval = -ENODEV;
476 printk(KERN_ERR "ldusb: No device or device unplugged %d\n", retval);
477 goto unlock_exit;
478 }
479
480 /* wait for data */
481 spin_lock_irq(&dev->rbsl);
482 if (dev->ring_head == dev->ring_tail) {
483 dev->interrupt_in_done = 0;
484 spin_unlock_irq(&dev->rbsl);
485 if (file->f_flags & O_NONBLOCK) {
486 retval = -EAGAIN;
487 goto unlock_exit;
488 }
489 retval = wait_event_interruptible(dev->read_wait, dev->interrupt_in_done);
490 if (retval < 0)
491 goto unlock_exit;
492 } else {
493 spin_unlock_irq(&dev->rbsl);
494 }
495
496 /* actual_buffer contains actual_length + interrupt_in_buffer */
497 actual_buffer = (size_t*)(dev->ring_buffer + dev->ring_tail*(sizeof(size_t)+dev->interrupt_in_endpoint_size));
498 bytes_to_read = min(count, *actual_buffer);
499 if (bytes_to_read < *actual_buffer)
500 dev_warn(&dev->intf->dev, "Read buffer overflow, %zd bytes dropped\n",
501 *actual_buffer-bytes_to_read);
502
503 /* copy one interrupt_in_buffer from ring_buffer into userspace */
504 if (copy_to_user(buffer, actual_buffer+1, bytes_to_read)) {
505 retval = -EFAULT;
506 goto unlock_exit;
507 }
508 dev->ring_tail = (dev->ring_tail+1) % ring_buffer_size;
509
510 retval = bytes_to_read;
511
512 spin_lock_irq(&dev->rbsl);
513 if (dev->buffer_overflow) {
514 dev->buffer_overflow = 0;
515 spin_unlock_irq(&dev->rbsl);
516 rv = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
517 if (rv < 0)
518 dev->buffer_overflow = 1;
519 } else {
520 spin_unlock_irq(&dev->rbsl);
521 }
522
523 unlock_exit:
524 /* unlock the device */
525 mutex_unlock(&dev->mutex);
526
527 exit:
528 return retval;
529 }
530
531 /**
532 * ld_usb_write
533 */
534 static ssize_t ld_usb_write(struct file *file, const char __user *buffer,
535 size_t count, loff_t *ppos)
536 {
537 struct ld_usb *dev;
538 size_t bytes_to_write;
539 int retval = 0;
540
541 dev = file->private_data;
542
543 /* verify that we actually have some data to write */
544 if (count == 0)
545 goto exit;
546
547 /* lock this object */
548 if (mutex_lock_interruptible(&dev->mutex)) {
549 retval = -ERESTARTSYS;
550 goto exit;
551 }
552
553 /* verify that the device wasn't unplugged */
554 if (dev->intf == NULL) {
555 retval = -ENODEV;
556 printk(KERN_ERR "ldusb: No device or device unplugged %d\n", retval);
557 goto unlock_exit;
558 }
559
560 /* wait until previous transfer is finished */
561 if (dev->interrupt_out_busy) {
562 if (file->f_flags & O_NONBLOCK) {
563 retval = -EAGAIN;
564 goto unlock_exit;
565 }
566 retval = wait_event_interruptible(dev->write_wait, !dev->interrupt_out_busy);
567 if (retval < 0) {
568 goto unlock_exit;
569 }
570 }
571
572 /* write the data into interrupt_out_buffer from userspace */
573 bytes_to_write = min(count, write_buffer_size*dev->interrupt_out_endpoint_size);
574 if (bytes_to_write < count)
575 dev_warn(&dev->intf->dev, "Write buffer overflow, %zd bytes dropped\n",count-bytes_to_write);
576 dev_dbg(&dev->intf->dev, "%s: count = %zd, bytes_to_write = %zd\n",
577 __func__, count, bytes_to_write);
578
579 if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write)) {
580 retval = -EFAULT;
581 goto unlock_exit;
582 }
583
584 if (dev->interrupt_out_endpoint == NULL) {
585 /* try HID_REQ_SET_REPORT=9 on control_endpoint instead of interrupt_out_endpoint */
586 retval = usb_control_msg(interface_to_usbdev(dev->intf),
587 usb_sndctrlpipe(interface_to_usbdev(dev->intf), 0),
588 9,
589 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
590 1 << 8, 0,
591 dev->interrupt_out_buffer,
592 bytes_to_write,
593 USB_CTRL_SET_TIMEOUT * HZ);
594 if (retval < 0)
595 dev_err(&dev->intf->dev,
596 "Couldn't submit HID_REQ_SET_REPORT %d\n",
597 retval);
598 goto unlock_exit;
599 }
600
601 /* send off the urb */
602 usb_fill_int_urb(dev->interrupt_out_urb,
603 interface_to_usbdev(dev->intf),
604 usb_sndintpipe(interface_to_usbdev(dev->intf),
605 dev->interrupt_out_endpoint->bEndpointAddress),
606 dev->interrupt_out_buffer,
607 bytes_to_write,
608 ld_usb_interrupt_out_callback,
609 dev,
610 dev->interrupt_out_interval);
611
612 dev->interrupt_out_busy = 1;
613 wmb();
614
615 retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL);
616 if (retval) {
617 dev->interrupt_out_busy = 0;
618 dev_err(&dev->intf->dev,
619 "Couldn't submit interrupt_out_urb %d\n", retval);
620 goto unlock_exit;
621 }
622 retval = bytes_to_write;
623
624 unlock_exit:
625 /* unlock the device */
626 mutex_unlock(&dev->mutex);
627
628 exit:
629 return retval;
630 }
631
632 /* file operations needed when we register this driver */
633 static const struct file_operations ld_usb_fops = {
634 .owner = THIS_MODULE,
635 .read = ld_usb_read,
636 .write = ld_usb_write,
637 .open = ld_usb_open,
638 .release = ld_usb_release,
639 .poll = ld_usb_poll,
640 .llseek = no_llseek,
641 };
642
643 /*
644 * usb class driver info in order to get a minor number from the usb core,
645 * and to have the device registered with the driver core
646 */
647 static struct usb_class_driver ld_usb_class = {
648 .name = "ldusb%d",
649 .fops = &ld_usb_fops,
650 .minor_base = USB_LD_MINOR_BASE,
651 };
652
653 /**
654 * ld_usb_probe
655 *
656 * Called by the usb core when a new device is connected that it thinks
657 * this driver might be interested in.
658 */
659 static int ld_usb_probe(struct usb_interface *intf, const struct usb_device_id *id)
660 {
661 struct usb_device *udev = interface_to_usbdev(intf);
662 struct ld_usb *dev = NULL;
663 struct usb_host_interface *iface_desc;
664 struct usb_endpoint_descriptor *endpoint;
665 char *buffer;
666 int i;
667 int retval = -ENOMEM;
668
669 /* allocate memory for our device state and initialize it */
670
671 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
672 if (dev == NULL) {
673 dev_err(&intf->dev, "Out of memory\n");
674 goto exit;
675 }
676 mutex_init(&dev->mutex);
677 spin_lock_init(&dev->rbsl);
678 dev->intf = intf;
679 init_waitqueue_head(&dev->read_wait);
680 init_waitqueue_head(&dev->write_wait);
681
682 /* workaround for early firmware versions on fast computers */
683 if ((le16_to_cpu(udev->descriptor.idVendor) == USB_VENDOR_ID_LD) &&
684 ((le16_to_cpu(udev->descriptor.idProduct) == USB_DEVICE_ID_LD_CASSY) ||
685 (le16_to_cpu(udev->descriptor.idProduct) == USB_DEVICE_ID_LD_COM3LAB)) &&
686 (le16_to_cpu(udev->descriptor.bcdDevice) <= 0x103)) {
687 buffer = kmalloc(256, GFP_KERNEL);
688 if (buffer == NULL) {
689 dev_err(&intf->dev, "Couldn't allocate string buffer\n");
690 goto error;
691 }
692 /* usb_string makes SETUP+STALL to leave always ControlReadLoop */
693 usb_string(udev, 255, buffer, 256);
694 kfree(buffer);
695 }
696
697 iface_desc = intf->cur_altsetting;
698
699 /* set up the endpoint information */
700 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
701 endpoint = &iface_desc->endpoint[i].desc;
702
703 if (usb_endpoint_is_int_in(endpoint))
704 dev->interrupt_in_endpoint = endpoint;
705
706 if (usb_endpoint_is_int_out(endpoint))
707 dev->interrupt_out_endpoint = endpoint;
708 }
709 if (dev->interrupt_in_endpoint == NULL) {
710 dev_err(&intf->dev, "Interrupt in endpoint not found\n");
711 goto error;
712 }
713 if (dev->interrupt_out_endpoint == NULL)
714 dev_warn(&intf->dev, "Interrupt out endpoint not found (using control endpoint instead)\n");
715
716 dev->interrupt_in_endpoint_size = usb_endpoint_maxp(dev->interrupt_in_endpoint);
717 dev->ring_buffer = kmalloc(ring_buffer_size*(sizeof(size_t)+dev->interrupt_in_endpoint_size), GFP_KERNEL);
718 if (!dev->ring_buffer) {
719 dev_err(&intf->dev, "Couldn't allocate ring_buffer\n");
720 goto error;
721 }
722 dev->interrupt_in_buffer = kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL);
723 if (!dev->interrupt_in_buffer) {
724 dev_err(&intf->dev, "Couldn't allocate interrupt_in_buffer\n");
725 goto error;
726 }
727 dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
728 if (!dev->interrupt_in_urb) {
729 dev_err(&intf->dev, "Couldn't allocate interrupt_in_urb\n");
730 goto error;
731 }
732 dev->interrupt_out_endpoint_size = dev->interrupt_out_endpoint ? usb_endpoint_maxp(dev->interrupt_out_endpoint) :
733 udev->descriptor.bMaxPacketSize0;
734 dev->interrupt_out_buffer = kmalloc(write_buffer_size*dev->interrupt_out_endpoint_size, GFP_KERNEL);
735 if (!dev->interrupt_out_buffer) {
736 dev_err(&intf->dev, "Couldn't allocate interrupt_out_buffer\n");
737 goto error;
738 }
739 dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
740 if (!dev->interrupt_out_urb) {
741 dev_err(&intf->dev, "Couldn't allocate interrupt_out_urb\n");
742 goto error;
743 }
744 dev->interrupt_in_interval = min_interrupt_in_interval > dev->interrupt_in_endpoint->bInterval ? min_interrupt_in_interval : dev->interrupt_in_endpoint->bInterval;
745 if (dev->interrupt_out_endpoint)
746 dev->interrupt_out_interval = min_interrupt_out_interval > dev->interrupt_out_endpoint->bInterval ? min_interrupt_out_interval : dev->interrupt_out_endpoint->bInterval;
747
748 /* we can register the device now, as it is ready */
749 usb_set_intfdata(intf, dev);
750
751 retval = usb_register_dev(intf, &ld_usb_class);
752 if (retval) {
753 /* something prevented us from registering this driver */
754 dev_err(&intf->dev, "Not able to get a minor for this device.\n");
755 usb_set_intfdata(intf, NULL);
756 goto error;
757 }
758
759 /* let the user know what node this device is now attached to */
760 dev_info(&intf->dev, "LD USB Device #%d now attached to major %d minor %d\n",
761 (intf->minor - USB_LD_MINOR_BASE), USB_MAJOR, intf->minor);
762
763 exit:
764 return retval;
765
766 error:
767 ld_usb_delete(dev);
768
769 return retval;
770 }
771
772 /**
773 * ld_usb_disconnect
774 *
775 * Called by the usb core when the device is removed from the system.
776 */
777 static void ld_usb_disconnect(struct usb_interface *intf)
778 {
779 struct ld_usb *dev;
780 int minor;
781
782 dev = usb_get_intfdata(intf);
783 usb_set_intfdata(intf, NULL);
784
785 minor = intf->minor;
786
787 /* give back our minor */
788 usb_deregister_dev(intf, &ld_usb_class);
789
790 mutex_lock(&dev->mutex);
791
792 /* if the device is not opened, then we clean up right now */
793 if (!dev->open_count) {
794 mutex_unlock(&dev->mutex);
795 ld_usb_delete(dev);
796 } else {
797 dev->intf = NULL;
798 /* wake up pollers */
799 wake_up_interruptible_all(&dev->read_wait);
800 wake_up_interruptible_all(&dev->write_wait);
801 mutex_unlock(&dev->mutex);
802 }
803
804 dev_info(&intf->dev, "LD USB Device #%d now disconnected\n",
805 (minor - USB_LD_MINOR_BASE));
806 }
807
808 /* usb specific object needed to register this driver with the usb subsystem */
809 static struct usb_driver ld_usb_driver = {
810 .name = "ldusb",
811 .probe = ld_usb_probe,
812 .disconnect = ld_usb_disconnect,
813 .id_table = ld_usb_table,
814 };
815
816 module_usb_driver(ld_usb_driver);
817
Linus' kernel tree