Commit | Line | Data |
---|---|---|
03270634 SH |
1 | /* |
2 | * adutux - driver for ADU devices from Ontrak Control Systems | |
3 | * This is an experimental driver. Use at your own risk. | |
4 | * This driver is not supported by Ontrak Control Systems. | |
5 | * | |
6 | * Copyright (c) 2003 John Homppi (SCO, leave this notice here) | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License as | |
10 | * published by the Free Software Foundation; either version 2 of | |
11 | * the License, or (at your option) any later version. | |
12 | * | |
13 | * derived from the Lego USB Tower driver 0.56: | |
14 | * Copyright (c) 2003 David Glance <davidgsf@sourceforge.net> | |
15 | * 2001 Juergen Stuber <stuber@loria.fr> | |
16 | * that was derived from USB Skeleton driver - 0.5 | |
17 | * Copyright (c) 2001 Greg Kroah-Hartman (greg@kroah.com) | |
18 | * | |
19 | */ | |
20 | ||
21 | #include <linux/kernel.h> | |
22 | #include <linux/errno.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/usb.h> | |
27 | #include <asm/uaccess.h> | |
28 | ||
29 | #ifdef CONFIG_USB_DEBUG | |
30 | static int debug = 5; | |
31 | #else | |
32 | static int debug = 1; | |
33 | #endif | |
34 | ||
35 | /* Use our own dbg macro */ | |
36 | #undef dbg | |
37 | #define dbg(lvl, format, arg...) \ | |
38 | do { \ | |
39 | if (debug >= lvl) \ | |
40 | printk(KERN_DEBUG __FILE__ " : " format " \n", ## arg); \ | |
41 | } while (0) | |
42 | ||
43 | ||
44 | /* Version Information */ | |
45 | #define DRIVER_VERSION "v0.0.13" | |
46 | #define DRIVER_AUTHOR "John Homppi" | |
47 | #define DRIVER_DESC "adutux (see www.ontrak.net)" | |
48 | ||
49 | /* Module parameters */ | |
50 | module_param(debug, int, S_IRUGO | S_IWUSR); | |
51 | MODULE_PARM_DESC(debug, "Debug enabled or not"); | |
52 | ||
53 | /* Define these values to match your device */ | |
54 | #define ADU_VENDOR_ID 0x0a07 | |
55 | #define ADU_PRODUCT_ID 0x0064 | |
56 | ||
57 | /* table of devices that work with this driver */ | |
58 | static struct usb_device_id device_table [] = { | |
59 | { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID) }, /* ADU100 */ | |
60 | { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+20) }, /* ADU120 */ | |
61 | { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+30) }, /* ADU130 */ | |
62 | { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+100) }, /* ADU200 */ | |
63 | { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+108) }, /* ADU208 */ | |
64 | { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+118) }, /* ADU218 */ | |
65 | { }/* Terminating entry */ | |
66 | }; | |
67 | ||
68 | MODULE_DEVICE_TABLE(usb, device_table); | |
69 | ||
70 | #ifdef CONFIG_USB_DYNAMIC_MINORS | |
71 | #define ADU_MINOR_BASE 0 | |
72 | #else | |
73 | #define ADU_MINOR_BASE 67 | |
74 | #endif | |
75 | ||
76 | /* we can have up to this number of device plugged in at once */ | |
77 | #define MAX_DEVICES 16 | |
78 | ||
79 | #define COMMAND_TIMEOUT (2*HZ) /* 60 second timeout for a command */ | |
80 | ||
81 | /* Structure to hold all of our device specific stuff */ | |
82 | struct adu_device { | |
83 | struct semaphore sem; /* locks this structure */ | |
84 | struct usb_device* udev; /* save off the usb device pointer */ | |
85 | struct usb_interface* interface; | |
86 | unsigned char minor; /* the starting minor number for this device */ | |
87 | char serial_number[8]; | |
88 | ||
89 | int open_count; /* number of times this port has been opened */ | |
90 | ||
91 | char* read_buffer_primary; | |
92 | int read_buffer_length; | |
93 | char* read_buffer_secondary; | |
94 | int secondary_head; | |
95 | int secondary_tail; | |
96 | spinlock_t buflock; | |
97 | ||
98 | wait_queue_head_t read_wait; | |
99 | wait_queue_head_t write_wait; | |
100 | ||
101 | char* interrupt_in_buffer; | |
102 | struct usb_endpoint_descriptor* interrupt_in_endpoint; | |
103 | struct urb* interrupt_in_urb; | |
104 | int read_urb_finished; | |
105 | ||
106 | char* interrupt_out_buffer; | |
107 | struct usb_endpoint_descriptor* interrupt_out_endpoint; | |
108 | struct urb* interrupt_out_urb; | |
109 | }; | |
110 | ||
111 | /* prevent races between open() and disconnect */ | |
112 | static DEFINE_MUTEX(disconnect_mutex); | |
113 | static struct usb_driver adu_driver; | |
114 | ||
115 | static void adu_debug_data(int level, const char *function, int size, | |
116 | const unsigned char *data) | |
117 | { | |
118 | int i; | |
119 | ||
120 | if (debug < level) | |
121 | return; | |
122 | ||
123 | printk(KERN_DEBUG __FILE__": %s - length = %d, data = ", | |
124 | function, size); | |
125 | for (i = 0; i < size; ++i) | |
126 | printk("%.2x ", data[i]); | |
127 | printk("\n"); | |
128 | } | |
129 | ||
130 | /** | |
131 | * adu_abort_transfers | |
132 | * aborts transfers and frees associated data structures | |
133 | */ | |
134 | static void adu_abort_transfers(struct adu_device *dev) | |
135 | { | |
136 | dbg(2," %s : enter", __FUNCTION__); | |
137 | ||
138 | if (dev == NULL) { | |
139 | dbg(1," %s : dev is null", __FUNCTION__); | |
140 | goto exit; | |
141 | } | |
142 | ||
143 | if (dev->udev == NULL) { | |
144 | dbg(1," %s : udev is null", __FUNCTION__); | |
145 | goto exit; | |
146 | } | |
147 | ||
148 | dbg(2," %s : udev state %d", __FUNCTION__, dev->udev->state); | |
149 | if (dev->udev->state == USB_STATE_NOTATTACHED) { | |
150 | dbg(1," %s : udev is not attached", __FUNCTION__); | |
151 | goto exit; | |
152 | } | |
153 | ||
154 | /* shutdown transfer */ | |
155 | usb_unlink_urb(dev->interrupt_in_urb); | |
156 | usb_unlink_urb(dev->interrupt_out_urb); | |
157 | ||
158 | exit: | |
159 | dbg(2," %s : leave", __FUNCTION__); | |
160 | } | |
161 | ||
162 | static void adu_delete(struct adu_device *dev) | |
163 | { | |
164 | dbg(2, "%s enter", __FUNCTION__); | |
165 | ||
166 | adu_abort_transfers(dev); | |
167 | ||
168 | /* free data structures */ | |
169 | usb_free_urb(dev->interrupt_in_urb); | |
170 | usb_free_urb(dev->interrupt_out_urb); | |
171 | kfree(dev->read_buffer_primary); | |
172 | kfree(dev->read_buffer_secondary); | |
173 | kfree(dev->interrupt_in_buffer); | |
174 | kfree(dev->interrupt_out_buffer); | |
175 | kfree(dev); | |
176 | ||
177 | dbg(2, "%s : leave", __FUNCTION__); | |
178 | } | |
179 | ||
180 | static void adu_interrupt_in_callback(struct urb *urb, struct pt_regs *regs) | |
181 | { | |
182 | struct adu_device *dev = urb->context; | |
183 | ||
184 | dbg(4," %s : enter, status %d", __FUNCTION__, urb->status); | |
185 | adu_debug_data(5, __FUNCTION__, urb->actual_length, | |
186 | urb->transfer_buffer); | |
187 | ||
188 | spin_lock(&dev->buflock); | |
189 | ||
190 | if (urb->status != 0) { | |
191 | if ((urb->status != -ENOENT) && (urb->status != -ECONNRESET)) { | |
192 | dbg(1," %s : nonzero status received: %d", | |
193 | __FUNCTION__, urb->status); | |
194 | } | |
195 | goto exit; | |
196 | } | |
197 | ||
198 | if (urb->actual_length > 0 && dev->interrupt_in_buffer[0] != 0x00) { | |
199 | if (dev->read_buffer_length < | |
200 | (4 * le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize)) - | |
201 | (urb->actual_length)) { | |
202 | memcpy (dev->read_buffer_primary + | |
203 | dev->read_buffer_length, | |
204 | dev->interrupt_in_buffer, urb->actual_length); | |
205 | ||
206 | dev->read_buffer_length += urb->actual_length; | |
207 | dbg(2," %s reading %d ", __FUNCTION__, | |
208 | urb->actual_length); | |
209 | } else { | |
210 | dbg(1," %s : read_buffer overflow", __FUNCTION__); | |
211 | } | |
212 | } | |
213 | ||
214 | exit: | |
215 | dev->read_urb_finished = 1; | |
216 | spin_unlock(&dev->buflock); | |
217 | /* always wake up so we recover from errors */ | |
218 | wake_up_interruptible(&dev->read_wait); | |
219 | adu_debug_data(5, __FUNCTION__, urb->actual_length, | |
220 | urb->transfer_buffer); | |
221 | dbg(4," %s : leave, status %d", __FUNCTION__, urb->status); | |
222 | } | |
223 | ||
224 | static void adu_interrupt_out_callback(struct urb *urb, struct pt_regs *regs) | |
225 | { | |
226 | struct adu_device *dev = urb->context; | |
227 | ||
228 | dbg(4," %s : enter, status %d", __FUNCTION__, urb->status); | |
229 | adu_debug_data(5,__FUNCTION__, urb->actual_length, urb->transfer_buffer); | |
230 | ||
231 | if (urb->status != 0) { | |
232 | if ((urb->status != -ENOENT) && | |
233 | (urb->status != -ECONNRESET)) { | |
234 | dbg(1, " %s :nonzero status received: %d", | |
235 | __FUNCTION__, urb->status); | |
236 | } | |
237 | goto exit; | |
238 | } | |
239 | ||
240 | wake_up_interruptible(&dev->write_wait); | |
241 | exit: | |
242 | ||
243 | adu_debug_data(5, __FUNCTION__, urb->actual_length, | |
244 | urb->transfer_buffer); | |
245 | dbg(4," %s : leave, status %d", __FUNCTION__, urb->status); | |
246 | } | |
247 | ||
248 | static int adu_open(struct inode *inode, struct file *file) | |
249 | { | |
250 | struct adu_device *dev = NULL; | |
251 | struct usb_interface *interface; | |
252 | int subminor; | |
253 | int retval = 0; | |
254 | ||
255 | dbg(2,"%s : enter", __FUNCTION__); | |
256 | ||
257 | subminor = iminor(inode); | |
258 | ||
259 | mutex_lock(&disconnect_mutex); | |
260 | ||
261 | interface = usb_find_interface(&adu_driver, subminor); | |
262 | if (!interface) { | |
263 | err("%s - error, can't find device for minor %d", | |
264 | __FUNCTION__, subminor); | |
265 | retval = -ENODEV; | |
266 | goto exit_no_device; | |
267 | } | |
268 | ||
269 | dev = usb_get_intfdata(interface); | |
270 | if (!dev) { | |
271 | retval = -ENODEV; | |
272 | goto exit_no_device; | |
273 | } | |
274 | ||
275 | /* lock this device */ | |
276 | if ((retval = down_interruptible(&dev->sem))) { | |
277 | dbg(2, "%s : sem down failed", __FUNCTION__); | |
278 | goto exit_no_device; | |
279 | } | |
280 | ||
281 | /* increment our usage count for the device */ | |
282 | ++dev->open_count; | |
283 | dbg(2,"%s : open count %d", __FUNCTION__, dev->open_count); | |
284 | ||
285 | /* save device in the file's private structure */ | |
286 | file->private_data = dev; | |
287 | ||
288 | /* initialize in direction */ | |
289 | dev->read_buffer_length = 0; | |
290 | ||
291 | /* fixup first read by having urb waiting for it */ | |
292 | usb_fill_int_urb(dev->interrupt_in_urb,dev->udev, | |
293 | usb_rcvintpipe(dev->udev, | |
294 | dev->interrupt_in_endpoint->bEndpointAddress), | |
295 | dev->interrupt_in_buffer, | |
296 | le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize), | |
297 | adu_interrupt_in_callback, dev, | |
298 | dev->interrupt_in_endpoint->bInterval); | |
299 | /* dev->interrupt_in_urb->transfer_flags |= URB_ASYNC_UNLINK; */ | |
300 | dev->read_urb_finished = 0; | |
301 | usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL); | |
302 | /* we ignore failure */ | |
303 | /* end of fixup for first read */ | |
304 | ||
305 | up(&dev->sem); | |
306 | ||
307 | exit_no_device: | |
308 | mutex_unlock(&disconnect_mutex); | |
309 | dbg(2,"%s : leave, return value %d ", __FUNCTION__, retval); | |
310 | ||
311 | return retval; | |
312 | } | |
313 | ||
314 | static int adu_release_internal(struct adu_device *dev) | |
315 | { | |
316 | int retval = 0; | |
317 | ||
318 | dbg(2," %s : enter", __FUNCTION__); | |
319 | ||
320 | if (dev->udev == NULL) { | |
321 | /* the device was unplugged before the file was released */ | |
322 | adu_delete(dev); | |
323 | goto exit; | |
324 | } | |
325 | ||
326 | /* decrement our usage count for the device */ | |
327 | --dev->open_count; | |
328 | dbg(2," %s : open count %d", __FUNCTION__, dev->open_count); | |
329 | if (dev->open_count <= 0) { | |
330 | adu_abort_transfers(dev); | |
331 | dev->open_count = 0; | |
332 | } | |
333 | ||
334 | exit: | |
335 | dbg(2," %s : leave", __FUNCTION__); | |
336 | return retval; | |
337 | } | |
338 | ||
339 | static int adu_release(struct inode *inode, struct file *file) | |
340 | { | |
341 | struct adu_device *dev = NULL; | |
342 | int retval = 0; | |
343 | ||
344 | dbg(2," %s : enter", __FUNCTION__); | |
345 | ||
346 | if (file == NULL) { | |
347 | dbg(1," %s : file is NULL", __FUNCTION__); | |
348 | retval = -ENODEV; | |
349 | goto exit; | |
350 | } | |
351 | ||
352 | dev = file->private_data; | |
353 | ||
354 | if (dev == NULL) { | |
355 | dbg(1," %s : object is NULL", __FUNCTION__); | |
356 | retval = -ENODEV; | |
357 | goto exit; | |
358 | } | |
359 | ||
360 | /* lock our device */ | |
361 | down(&dev->sem); /* not interruptible */ | |
362 | ||
363 | if (dev->open_count <= 0) { | |
364 | dbg(1," %s : device not opened", __FUNCTION__); | |
365 | retval = -ENODEV; | |
366 | goto exit; | |
367 | } | |
368 | ||
369 | /* do the work */ | |
370 | retval = adu_release_internal(dev); | |
371 | ||
372 | exit: | |
373 | up(&dev->sem); | |
374 | dbg(2," %s : leave, return value %d", __FUNCTION__, retval); | |
375 | return retval; | |
376 | } | |
377 | ||
378 | static ssize_t adu_read(struct file *file, __user char *buffer, size_t count, | |
379 | loff_t *ppos) | |
380 | { | |
381 | struct adu_device *dev; | |
382 | size_t bytes_read = 0; | |
383 | size_t bytes_to_read = count; | |
384 | int i; | |
385 | int retval = 0; | |
386 | int timeout = 0; | |
387 | int should_submit = 0; | |
388 | unsigned long flags; | |
389 | DECLARE_WAITQUEUE(wait, current); | |
390 | ||
391 | dbg(2," %s : enter, count = %Zd, file=%p", __FUNCTION__, count, file); | |
392 | ||
393 | dev = file->private_data; | |
394 | dbg(2," %s : dev=%p", __FUNCTION__, dev); | |
395 | /* lock this object */ | |
396 | if (down_interruptible(&dev->sem)) | |
397 | return -ERESTARTSYS; | |
398 | ||
399 | /* verify that the device wasn't unplugged */ | |
400 | if (dev->udev == NULL || dev->minor == 0) { | |
401 | retval = -ENODEV; | |
402 | err("No device or device unplugged %d", retval); | |
403 | goto exit; | |
404 | } | |
405 | ||
406 | /* verify that some data was requested */ | |
407 | if (count == 0) { | |
408 | dbg(1," %s : read request of 0 bytes", __FUNCTION__); | |
409 | goto exit; | |
410 | } | |
411 | ||
412 | timeout = COMMAND_TIMEOUT; | |
413 | dbg(2," %s : about to start looping", __FUNCTION__); | |
414 | while (bytes_to_read) { | |
415 | int data_in_secondary = dev->secondary_tail - dev->secondary_head; | |
416 | dbg(2," %s : while, data_in_secondary=%d, status=%d", | |
417 | __FUNCTION__, data_in_secondary, | |
418 | dev->interrupt_in_urb->status); | |
419 | ||
420 | if (data_in_secondary) { | |
421 | /* drain secondary buffer */ | |
422 | int amount = bytes_to_read < data_in_secondary ? bytes_to_read : data_in_secondary; | |
423 | i = copy_to_user(buffer, dev->read_buffer_secondary+dev->secondary_head, amount); | |
424 | if (i < 0) { | |
425 | retval = -EFAULT; | |
426 | goto exit; | |
427 | } | |
428 | dev->secondary_head += (amount - i); | |
429 | bytes_read += (amount - i); | |
430 | bytes_to_read -= (amount - i); | |
431 | if (i) { | |
432 | retval = bytes_read ? bytes_read : -EFAULT; | |
433 | goto exit; | |
434 | } | |
435 | } else { | |
436 | /* we check the primary buffer */ | |
437 | spin_lock_irqsave (&dev->buflock, flags); | |
438 | if (dev->read_buffer_length) { | |
439 | /* we secure access to the primary */ | |
440 | char *tmp; | |
441 | dbg(2," %s : swap, read_buffer_length = %d", | |
442 | __FUNCTION__, dev->read_buffer_length); | |
443 | tmp = dev->read_buffer_secondary; | |
444 | dev->read_buffer_secondary = dev->read_buffer_primary; | |
445 | dev->read_buffer_primary = tmp; | |
446 | dev->secondary_head = 0; | |
447 | dev->secondary_tail = dev->read_buffer_length; | |
448 | dev->read_buffer_length = 0; | |
449 | spin_unlock_irqrestore(&dev->buflock, flags); | |
450 | /* we have a free buffer so use it */ | |
451 | should_submit = 1; | |
452 | } else { | |
453 | /* even the primary was empty - we may need to do IO */ | |
454 | if (dev->interrupt_in_urb->status == -EINPROGRESS) { | |
455 | /* somebody is doing IO */ | |
456 | spin_unlock_irqrestore(&dev->buflock, flags); | |
457 | dbg(2," %s : submitted already", __FUNCTION__); | |
458 | } else { | |
459 | /* we must initiate input */ | |
460 | dbg(2," %s : initiate input", __FUNCTION__); | |
461 | dev->read_urb_finished = 0; | |
462 | ||
463 | usb_fill_int_urb(dev->interrupt_in_urb,dev->udev, | |
464 | usb_rcvintpipe(dev->udev, | |
465 | dev->interrupt_in_endpoint->bEndpointAddress), | |
466 | dev->interrupt_in_buffer, | |
467 | le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize), | |
468 | adu_interrupt_in_callback, | |
469 | dev, | |
470 | dev->interrupt_in_endpoint->bInterval); | |
471 | retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL); | |
472 | if (!retval) { | |
473 | spin_unlock_irqrestore(&dev->buflock, flags); | |
474 | dbg(2," %s : submitted OK", __FUNCTION__); | |
475 | } else { | |
476 | if (retval == -ENOMEM) { | |
477 | retval = bytes_read ? bytes_read : -ENOMEM; | |
478 | } | |
479 | spin_unlock_irqrestore(&dev->buflock, flags); | |
480 | dbg(2," %s : submit failed", __FUNCTION__); | |
481 | goto exit; | |
482 | } | |
483 | } | |
484 | ||
485 | /* we wait for I/O to complete */ | |
486 | set_current_state(TASK_INTERRUPTIBLE); | |
487 | add_wait_queue(&dev->read_wait, &wait); | |
488 | if (!dev->read_urb_finished) | |
489 | timeout = schedule_timeout(COMMAND_TIMEOUT); | |
490 | else | |
491 | set_current_state(TASK_RUNNING); | |
492 | remove_wait_queue(&dev->read_wait, &wait); | |
493 | ||
494 | if (timeout <= 0) { | |
495 | dbg(2," %s : timeout", __FUNCTION__); | |
496 | retval = bytes_read ? bytes_read : -ETIMEDOUT; | |
497 | goto exit; | |
498 | } | |
499 | ||
500 | if (signal_pending(current)) { | |
501 | dbg(2," %s : signal pending", __FUNCTION__); | |
502 | retval = bytes_read ? bytes_read : -EINTR; | |
503 | goto exit; | |
504 | } | |
505 | } | |
506 | } | |
507 | } | |
508 | ||
509 | retval = bytes_read; | |
510 | /* if the primary buffer is empty then use it */ | |
511 | if (should_submit && !dev->interrupt_in_urb->status==-EINPROGRESS) { | |
512 | usb_fill_int_urb(dev->interrupt_in_urb,dev->udev, | |
513 | usb_rcvintpipe(dev->udev, | |
514 | dev->interrupt_in_endpoint->bEndpointAddress), | |
515 | dev->interrupt_in_buffer, | |
516 | le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize), | |
517 | adu_interrupt_in_callback, | |
518 | dev, | |
519 | dev->interrupt_in_endpoint->bInterval); | |
520 | /* dev->interrupt_in_urb->transfer_flags |= URB_ASYNC_UNLINK; */ | |
521 | dev->read_urb_finished = 0; | |
522 | usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL); | |
523 | /* we ignore failure */ | |
524 | } | |
525 | ||
526 | exit: | |
527 | /* unlock the device */ | |
528 | up(&dev->sem); | |
529 | ||
530 | dbg(2," %s : leave, return value %d", __FUNCTION__, retval); | |
531 | return retval; | |
532 | } | |
533 | ||
534 | static ssize_t adu_write(struct file *file, const __user char *buffer, | |
535 | size_t count, loff_t *ppos) | |
536 | { | |
537 | struct adu_device *dev; | |
538 | size_t bytes_written = 0; | |
539 | size_t bytes_to_write; | |
540 | size_t buffer_size; | |
541 | int retval = 0; | |
542 | int timeout = 0; | |
543 | ||
544 | dbg(2," %s : enter, count = %Zd", __FUNCTION__, count); | |
545 | ||
546 | dev = file->private_data; | |
547 | ||
548 | /* lock this object */ | |
549 | down_interruptible(&dev->sem); | |
550 | ||
551 | /* verify that the device wasn't unplugged */ | |
552 | if (dev->udev == NULL || dev->minor == 0) { | |
553 | retval = -ENODEV; | |
554 | err("No device or device unplugged %d", retval); | |
555 | goto exit; | |
556 | } | |
557 | ||
558 | /* verify that we actually have some data to write */ | |
559 | if (count == 0) { | |
560 | dbg(1," %s : write request of 0 bytes", __FUNCTION__); | |
561 | goto exit; | |
562 | } | |
563 | ||
564 | ||
565 | while (count > 0) { | |
566 | if (dev->interrupt_out_urb->status == -EINPROGRESS) { | |
567 | timeout = COMMAND_TIMEOUT; | |
568 | ||
569 | while (timeout > 0) { | |
570 | if (signal_pending(current)) { | |
571 | dbg(1," %s : interrupted", __FUNCTION__); | |
572 | retval = -EINTR; | |
573 | goto exit; | |
574 | } | |
575 | up(&dev->sem); | |
576 | timeout = interruptible_sleep_on_timeout(&dev->write_wait, timeout); | |
577 | down_interruptible(&dev->sem); | |
578 | if (timeout > 0) { | |
579 | break; | |
580 | } | |
581 | dbg(1," %s : interrupted timeout: %d", __FUNCTION__, timeout); | |
582 | } | |
583 | ||
584 | ||
585 | dbg(1," %s : final timeout: %d", __FUNCTION__, timeout); | |
586 | ||
587 | if (timeout == 0) { | |
588 | dbg(1, "%s - command timed out.", __FUNCTION__); | |
589 | retval = -ETIMEDOUT; | |
590 | goto exit; | |
591 | } | |
592 | ||
593 | dbg(4," %s : in progress, count = %Zd", __FUNCTION__, count); | |
594 | ||
595 | } else { | |
596 | dbg(4," %s : sending, count = %Zd", __FUNCTION__, count); | |
597 | ||
598 | /* write the data into interrupt_out_buffer from userspace */ | |
599 | buffer_size = le16_to_cpu(dev->interrupt_out_endpoint->wMaxPacketSize); | |
600 | bytes_to_write = count > buffer_size ? buffer_size : count; | |
601 | dbg(4," %s : buffer_size = %Zd, count = %Zd, bytes_to_write = %Zd", | |
602 | __FUNCTION__, buffer_size, count, bytes_to_write); | |
603 | ||
604 | if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write) != 0) { | |
605 | retval = -EFAULT; | |
606 | goto exit; | |
607 | } | |
608 | ||
609 | /* send off the urb */ | |
610 | usb_fill_int_urb( | |
611 | dev->interrupt_out_urb, | |
612 | dev->udev, | |
613 | usb_sndintpipe(dev->udev, dev->interrupt_out_endpoint->bEndpointAddress), | |
614 | dev->interrupt_out_buffer, | |
615 | bytes_to_write, | |
616 | adu_interrupt_out_callback, | |
617 | dev, | |
618 | dev->interrupt_in_endpoint->bInterval); | |
619 | /* dev->interrupt_in_urb->transfer_flags |= URB_ASYNC_UNLINK; */ | |
620 | dev->interrupt_out_urb->actual_length = bytes_to_write; | |
621 | retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL); | |
622 | if (retval < 0) { | |
623 | err("Couldn't submit interrupt_out_urb %d", retval); | |
624 | goto exit; | |
625 | } | |
626 | ||
627 | buffer += bytes_to_write; | |
628 | count -= bytes_to_write; | |
629 | ||
630 | bytes_written += bytes_to_write; | |
631 | } | |
632 | } | |
633 | ||
634 | retval = bytes_written; | |
635 | ||
636 | exit: | |
637 | /* unlock the device */ | |
638 | up(&dev->sem); | |
639 | ||
640 | dbg(2," %s : leave, return value %d", __FUNCTION__, retval); | |
641 | ||
642 | return retval; | |
643 | } | |
644 | ||
645 | /* file operations needed when we register this driver */ | |
646 | static struct file_operations adu_fops = { | |
647 | .owner = THIS_MODULE, | |
648 | .read = adu_read, | |
649 | .write = adu_write, | |
650 | .open = adu_open, | |
651 | .release = adu_release, | |
652 | }; | |
653 | ||
654 | /* | |
655 | * usb class driver info in order to get a minor number from the usb core, | |
656 | * and to have the device registered with devfs and the driver core | |
657 | */ | |
658 | static struct usb_class_driver adu_class = { | |
659 | .name = "usb/adutux%d", | |
660 | .fops = &adu_fops, | |
661 | .minor_base = ADU_MINOR_BASE, | |
662 | }; | |
663 | ||
664 | /** | |
665 | * adu_probe | |
666 | * | |
667 | * Called by the usb core when a new device is connected that it thinks | |
668 | * this driver might be interested in. | |
669 | */ | |
670 | static int adu_probe(struct usb_interface *interface, | |
671 | const struct usb_device_id *id) | |
672 | { | |
673 | struct usb_device *udev = interface_to_usbdev(interface); | |
674 | struct adu_device *dev = NULL; | |
675 | struct usb_host_interface *iface_desc; | |
676 | struct usb_endpoint_descriptor *endpoint; | |
677 | int retval = -ENODEV; | |
678 | int in_end_size; | |
679 | int out_end_size; | |
680 | int i; | |
681 | ||
682 | dbg(2," %s : enter", __FUNCTION__); | |
683 | ||
684 | if (udev == NULL) { | |
685 | dev_err(&interface->dev, "udev is NULL.\n"); | |
686 | goto exit; | |
687 | } | |
688 | ||
689 | /* allocate memory for our device state and intialize it */ | |
690 | dev = kzalloc(sizeof(struct adu_device), GFP_KERNEL); | |
691 | if (dev == NULL) { | |
692 | dev_err(&interface->dev, "Out of memory\n"); | |
693 | retval = -ENOMEM; | |
694 | goto exit; | |
695 | } | |
696 | ||
697 | init_MUTEX(&dev->sem); | |
698 | spin_lock_init(&dev->buflock); | |
699 | dev->udev = udev; | |
700 | init_waitqueue_head(&dev->read_wait); | |
701 | init_waitqueue_head(&dev->write_wait); | |
702 | ||
703 | iface_desc = &interface->altsetting[0]; | |
704 | ||
705 | /* set up the endpoint information */ | |
706 | for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { | |
707 | endpoint = &iface_desc->endpoint[i].desc; | |
708 | ||
709 | if (usb_endpoint_is_int_in(endpoint)) | |
710 | dev->interrupt_in_endpoint = endpoint; | |
711 | ||
712 | if (usb_endpoint_is_int_out(endpoint)) | |
713 | dev->interrupt_out_endpoint = endpoint; | |
714 | } | |
715 | if (dev->interrupt_in_endpoint == NULL) { | |
716 | dev_err(&interface->dev, "interrupt in endpoint not found\n"); | |
717 | goto error; | |
718 | } | |
719 | if (dev->interrupt_out_endpoint == NULL) { | |
720 | dev_err(&interface->dev, "interrupt out endpoint not found\n"); | |
721 | goto error; | |
722 | } | |
723 | ||
724 | in_end_size = le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize); | |
725 | out_end_size = le16_to_cpu(dev->interrupt_out_endpoint->wMaxPacketSize); | |
726 | ||
727 | dev->read_buffer_primary = kmalloc((4 * in_end_size), GFP_KERNEL); | |
728 | if (!dev->read_buffer_primary) { | |
729 | dev_err(&interface->dev, "Couldn't allocate read_buffer_primary\n"); | |
730 | retval = -ENOMEM; | |
731 | goto error; | |
732 | } | |
733 | ||
734 | /* debug code prime the buffer */ | |
735 | memset(dev->read_buffer_primary, 'a', in_end_size); | |
736 | memset(dev->read_buffer_primary + in_end_size, 'b', in_end_size); | |
737 | memset(dev->read_buffer_primary + (2 * in_end_size), 'c', in_end_size); | |
738 | memset(dev->read_buffer_primary + (3 * in_end_size), 'd', in_end_size); | |
739 | ||
740 | dev->read_buffer_secondary = kmalloc((4 * in_end_size), GFP_KERNEL); | |
741 | if (!dev->read_buffer_secondary) { | |
742 | dev_err(&interface->dev, "Couldn't allocate read_buffer_secondary\n"); | |
743 | retval = -ENOMEM; | |
744 | goto error; | |
745 | } | |
746 | ||
747 | /* debug code prime the buffer */ | |
748 | memset(dev->read_buffer_secondary, 'e', in_end_size); | |
749 | memset(dev->read_buffer_secondary + in_end_size, 'f', in_end_size); | |
750 | memset(dev->read_buffer_secondary + (2 * in_end_size), 'g', in_end_size); | |
751 | memset(dev->read_buffer_secondary + (3 * in_end_size), 'h', in_end_size); | |
752 | ||
753 | dev->interrupt_in_buffer = kmalloc(in_end_size, GFP_KERNEL); | |
754 | if (!dev->interrupt_in_buffer) { | |
755 | dev_err(&interface->dev, "Couldn't allocate interrupt_in_buffer\n"); | |
756 | goto error; | |
757 | } | |
758 | ||
759 | /* debug code prime the buffer */ | |
760 | memset(dev->interrupt_in_buffer, 'i', in_end_size); | |
761 | ||
762 | dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL); | |
763 | if (!dev->interrupt_in_urb) { | |
764 | dev_err(&interface->dev, "Couldn't allocate interrupt_in_urb\n"); | |
765 | goto error; | |
766 | } | |
767 | dev->interrupt_out_buffer = kmalloc(out_end_size, GFP_KERNEL); | |
768 | if (!dev->interrupt_out_buffer) { | |
769 | dev_err(&interface->dev, "Couldn't allocate interrupt_out_buffer\n"); | |
770 | goto error; | |
771 | } | |
772 | dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL); | |
773 | if (!dev->interrupt_out_urb) { | |
774 | dev_err(&interface->dev, "Couldn't allocate interrupt_out_urb\n"); | |
775 | goto error; | |
776 | } | |
777 | ||
778 | if (!usb_string(udev, udev->descriptor.iSerialNumber, dev->serial_number, | |
779 | sizeof(dev->serial_number))) { | |
780 | dev_err(&interface->dev, "Could not retrieve serial number\n"); | |
781 | goto error; | |
782 | } | |
783 | dbg(2," %s : serial_number=%s", __FUNCTION__, dev->serial_number); | |
784 | ||
785 | /* we can register the device now, as it is ready */ | |
786 | usb_set_intfdata(interface, dev); | |
787 | ||
788 | retval = usb_register_dev(interface, &adu_class); | |
789 | ||
790 | if (retval) { | |
791 | /* something prevented us from registering this driver */ | |
792 | dev_err(&interface->dev, "Not able to get a minor for this device.\n"); | |
793 | usb_set_intfdata(interface, NULL); | |
794 | goto error; | |
795 | } | |
796 | ||
797 | dev->minor = interface->minor; | |
798 | ||
799 | /* let the user know what node this device is now attached to */ | |
800 | dev_info(&interface->dev, "ADU%d %s now attached to /dev/usb/adutux%d", | |
801 | udev->descriptor.idProduct, dev->serial_number, | |
802 | (dev->minor - ADU_MINOR_BASE)); | |
803 | exit: | |
804 | dbg(2," %s : leave, return value %p (dev)", __FUNCTION__, dev); | |
805 | ||
806 | return retval; | |
807 | ||
808 | error: | |
809 | adu_delete(dev); | |
810 | return retval; | |
811 | } | |
812 | ||
813 | /** | |
814 | * adu_disconnect | |
815 | * | |
816 | * Called by the usb core when the device is removed from the system. | |
817 | */ | |
818 | static void adu_disconnect(struct usb_interface *interface) | |
819 | { | |
820 | struct adu_device *dev; | |
821 | int minor; | |
822 | ||
823 | dbg(2," %s : enter", __FUNCTION__); | |
824 | ||
825 | mutex_lock(&disconnect_mutex); /* not interruptible */ | |
826 | ||
827 | dev = usb_get_intfdata(interface); | |
828 | usb_set_intfdata(interface, NULL); | |
829 | ||
830 | down(&dev->sem); /* not interruptible */ | |
831 | ||
832 | minor = dev->minor; | |
833 | ||
834 | /* give back our minor */ | |
835 | usb_deregister_dev(interface, &adu_class); | |
836 | dev->minor = 0; | |
837 | ||
838 | /* if the device is not opened, then we clean up right now */ | |
839 | dbg(2," %s : open count %d", __FUNCTION__, dev->open_count); | |
840 | if (!dev->open_count) { | |
841 | up(&dev->sem); | |
842 | adu_delete(dev); | |
843 | } else { | |
844 | dev->udev = NULL; | |
845 | up(&dev->sem); | |
846 | } | |
847 | ||
848 | mutex_unlock(&disconnect_mutex); | |
849 | ||
850 | dev_info(&interface->dev, "ADU device adutux%d now disconnected", | |
851 | (minor - ADU_MINOR_BASE)); | |
852 | ||
853 | dbg(2," %s : leave", __FUNCTION__); | |
854 | } | |
855 | ||
856 | /* usb specific object needed to register this driver with the usb subsystem */ | |
857 | static struct usb_driver adu_driver = { | |
858 | .name = "adutux", | |
859 | .probe = adu_probe, | |
860 | .disconnect = adu_disconnect, | |
861 | .id_table = device_table, | |
862 | }; | |
863 | ||
864 | static int __init adu_init(void) | |
865 | { | |
866 | int result; | |
867 | ||
868 | dbg(2," %s : enter", __FUNCTION__); | |
869 | ||
870 | /* register this driver with the USB subsystem */ | |
871 | result = usb_register(&adu_driver); | |
872 | if (result < 0) { | |
873 | err("usb_register failed for the "__FILE__" driver. " | |
874 | "Error number %d", result); | |
875 | goto exit; | |
876 | } | |
877 | ||
878 | info("adutux " DRIVER_DESC " " DRIVER_VERSION); | |
879 | info("adutux is an experimental driver. Use at your own risk"); | |
880 | ||
881 | exit: | |
882 | dbg(2," %s : leave, return value %d", __FUNCTION__, result); | |
883 | ||
884 | return result; | |
885 | } | |
886 | ||
887 | static void __exit adu_exit(void) | |
888 | { | |
889 | dbg(2," %s : enter", __FUNCTION__); | |
890 | /* deregister this driver with the USB subsystem */ | |
891 | usb_deregister(&adu_driver); | |
892 | dbg(2," %s : leave", __FUNCTION__); | |
893 | } | |
894 | ||
895 | module_init(adu_init); | |
896 | module_exit(adu_exit); | |
897 | ||
898 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
899 | MODULE_DESCRIPTION(DRIVER_DESC); | |
900 | MODULE_LICENSE("GPL"); |