Commit | Line | Data |
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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> | |
8293c568 | 27 | #include <linux/mutex.h> |
03270634 SH |
28 | #include <asm/uaccess.h> |
29 | ||
30 | #ifdef CONFIG_USB_DEBUG | |
31 | static int debug = 5; | |
32 | #else | |
33 | static int debug = 1; | |
34 | #endif | |
35 | ||
36 | /* Use our own dbg macro */ | |
37 | #undef dbg | |
38 | #define dbg(lvl, format, arg...) \ | |
39 | do { \ | |
40 | if (debug >= lvl) \ | |
41 | printk(KERN_DEBUG __FILE__ " : " format " \n", ## arg); \ | |
42 | } while (0) | |
43 | ||
44 | ||
45 | /* Version Information */ | |
46 | #define DRIVER_VERSION "v0.0.13" | |
47 | #define DRIVER_AUTHOR "John Homppi" | |
48 | #define DRIVER_DESC "adutux (see www.ontrak.net)" | |
49 | ||
50 | /* Module parameters */ | |
51 | module_param(debug, int, S_IRUGO | S_IWUSR); | |
52 | MODULE_PARM_DESC(debug, "Debug enabled or not"); | |
53 | ||
54 | /* Define these values to match your device */ | |
55 | #define ADU_VENDOR_ID 0x0a07 | |
56 | #define ADU_PRODUCT_ID 0x0064 | |
57 | ||
58 | /* table of devices that work with this driver */ | |
59 | static struct usb_device_id device_table [] = { | |
60 | { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID) }, /* ADU100 */ | |
61 | { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+20) }, /* ADU120 */ | |
62 | { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+30) }, /* ADU130 */ | |
63 | { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+100) }, /* ADU200 */ | |
64 | { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+108) }, /* ADU208 */ | |
65 | { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+118) }, /* ADU218 */ | |
66 | { }/* Terminating entry */ | |
67 | }; | |
68 | ||
69 | MODULE_DEVICE_TABLE(usb, device_table); | |
70 | ||
71 | #ifdef CONFIG_USB_DYNAMIC_MINORS | |
72 | #define ADU_MINOR_BASE 0 | |
73 | #else | |
74 | #define ADU_MINOR_BASE 67 | |
75 | #endif | |
76 | ||
77 | /* we can have up to this number of device plugged in at once */ | |
78 | #define MAX_DEVICES 16 | |
79 | ||
80 | #define COMMAND_TIMEOUT (2*HZ) /* 60 second timeout for a command */ | |
81 | ||
82 | /* Structure to hold all of our device specific stuff */ | |
83 | struct adu_device { | |
8293c568 | 84 | struct mutex mtx; /* locks this structure */ |
03270634 SH |
85 | struct usb_device* udev; /* save off the usb device pointer */ |
86 | struct usb_interface* interface; | |
87 | unsigned char minor; /* the starting minor number for this device */ | |
88 | char serial_number[8]; | |
89 | ||
90 | int open_count; /* number of times this port has been opened */ | |
91 | ||
92 | char* read_buffer_primary; | |
93 | int read_buffer_length; | |
94 | char* read_buffer_secondary; | |
95 | int secondary_head; | |
96 | int secondary_tail; | |
97 | spinlock_t buflock; | |
98 | ||
99 | wait_queue_head_t read_wait; | |
100 | wait_queue_head_t write_wait; | |
101 | ||
102 | char* interrupt_in_buffer; | |
103 | struct usb_endpoint_descriptor* interrupt_in_endpoint; | |
104 | struct urb* interrupt_in_urb; | |
105 | int read_urb_finished; | |
106 | ||
107 | char* interrupt_out_buffer; | |
108 | struct usb_endpoint_descriptor* interrupt_out_endpoint; | |
109 | struct urb* interrupt_out_urb; | |
110 | }; | |
111 | ||
03270634 SH |
112 | static struct usb_driver adu_driver; |
113 | ||
114 | static void adu_debug_data(int level, const char *function, int size, | |
115 | const unsigned char *data) | |
116 | { | |
117 | int i; | |
118 | ||
119 | if (debug < level) | |
120 | return; | |
121 | ||
122 | printk(KERN_DEBUG __FILE__": %s - length = %d, data = ", | |
123 | function, size); | |
124 | for (i = 0; i < size; ++i) | |
125 | printk("%.2x ", data[i]); | |
126 | printk("\n"); | |
127 | } | |
128 | ||
129 | /** | |
130 | * adu_abort_transfers | |
131 | * aborts transfers and frees associated data structures | |
132 | */ | |
133 | static void adu_abort_transfers(struct adu_device *dev) | |
134 | { | |
135 | dbg(2," %s : enter", __FUNCTION__); | |
136 | ||
137 | if (dev == NULL) { | |
138 | dbg(1," %s : dev is null", __FUNCTION__); | |
139 | goto exit; | |
140 | } | |
141 | ||
142 | if (dev->udev == NULL) { | |
143 | dbg(1," %s : udev is null", __FUNCTION__); | |
144 | goto exit; | |
145 | } | |
146 | ||
147 | dbg(2," %s : udev state %d", __FUNCTION__, dev->udev->state); | |
148 | if (dev->udev->state == USB_STATE_NOTATTACHED) { | |
149 | dbg(1," %s : udev is not attached", __FUNCTION__); | |
150 | goto exit; | |
151 | } | |
152 | ||
153 | /* shutdown transfer */ | |
154 | usb_unlink_urb(dev->interrupt_in_urb); | |
155 | usb_unlink_urb(dev->interrupt_out_urb); | |
156 | ||
157 | exit: | |
158 | dbg(2," %s : leave", __FUNCTION__); | |
159 | } | |
160 | ||
161 | static void adu_delete(struct adu_device *dev) | |
162 | { | |
163 | dbg(2, "%s enter", __FUNCTION__); | |
164 | ||
165 | adu_abort_transfers(dev); | |
166 | ||
167 | /* free data structures */ | |
168 | usb_free_urb(dev->interrupt_in_urb); | |
169 | usb_free_urb(dev->interrupt_out_urb); | |
170 | kfree(dev->read_buffer_primary); | |
171 | kfree(dev->read_buffer_secondary); | |
172 | kfree(dev->interrupt_in_buffer); | |
173 | kfree(dev->interrupt_out_buffer); | |
174 | kfree(dev); | |
175 | ||
176 | dbg(2, "%s : leave", __FUNCTION__); | |
177 | } | |
178 | ||
7d12e780 | 179 | static void adu_interrupt_in_callback(struct urb *urb) |
03270634 SH |
180 | { |
181 | struct adu_device *dev = urb->context; | |
24497a00 | 182 | int status = urb->status; |
03270634 | 183 | |
24497a00 | 184 | dbg(4," %s : enter, status %d", __FUNCTION__, status); |
03270634 SH |
185 | adu_debug_data(5, __FUNCTION__, urb->actual_length, |
186 | urb->transfer_buffer); | |
187 | ||
188 | spin_lock(&dev->buflock); | |
189 | ||
24497a00 GKH |
190 | if (status != 0) { |
191 | if ((status != -ENOENT) && (status != -ECONNRESET)) { | |
03270634 | 192 | dbg(1," %s : nonzero status received: %d", |
24497a00 | 193 | __FUNCTION__, status); |
03270634 SH |
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); | |
24497a00 | 221 | dbg(4," %s : leave, status %d", __FUNCTION__, status); |
03270634 SH |
222 | } |
223 | ||
7d12e780 | 224 | static void adu_interrupt_out_callback(struct urb *urb) |
03270634 SH |
225 | { |
226 | struct adu_device *dev = urb->context; | |
24497a00 | 227 | int status = urb->status; |
03270634 | 228 | |
24497a00 | 229 | dbg(4," %s : enter, status %d", __FUNCTION__, status); |
03270634 SH |
230 | adu_debug_data(5,__FUNCTION__, urb->actual_length, urb->transfer_buffer); |
231 | ||
24497a00 GKH |
232 | if (status != 0) { |
233 | if ((status != -ENOENT) && | |
234 | (status != -ECONNRESET)) { | |
03270634 | 235 | dbg(1, " %s :nonzero status received: %d", |
24497a00 | 236 | __FUNCTION__, status); |
03270634 SH |
237 | } |
238 | goto exit; | |
239 | } | |
240 | ||
241 | wake_up_interruptible(&dev->write_wait); | |
242 | exit: | |
243 | ||
244 | adu_debug_data(5, __FUNCTION__, urb->actual_length, | |
245 | urb->transfer_buffer); | |
24497a00 | 246 | dbg(4," %s : leave, status %d", __FUNCTION__, status); |
03270634 SH |
247 | } |
248 | ||
249 | static int adu_open(struct inode *inode, struct file *file) | |
250 | { | |
251 | struct adu_device *dev = NULL; | |
252 | struct usb_interface *interface; | |
253 | int subminor; | |
254 | int retval = 0; | |
255 | ||
256 | dbg(2,"%s : enter", __FUNCTION__); | |
257 | ||
258 | subminor = iminor(inode); | |
259 | ||
03270634 SH |
260 | interface = usb_find_interface(&adu_driver, subminor); |
261 | if (!interface) { | |
262 | err("%s - error, can't find device for minor %d", | |
263 | __FUNCTION__, subminor); | |
264 | retval = -ENODEV; | |
265 | goto exit_no_device; | |
266 | } | |
267 | ||
268 | dev = usb_get_intfdata(interface); | |
269 | if (!dev) { | |
270 | retval = -ENODEV; | |
271 | goto exit_no_device; | |
272 | } | |
273 | ||
274 | /* lock this device */ | |
8293c568 MK |
275 | if ((retval = mutex_lock_interruptible(&dev->mtx))) { |
276 | dbg(2, "%s : mutex lock failed", __FUNCTION__); | |
03270634 SH |
277 | goto exit_no_device; |
278 | } | |
279 | ||
280 | /* increment our usage count for the device */ | |
281 | ++dev->open_count; | |
282 | dbg(2,"%s : open count %d", __FUNCTION__, dev->open_count); | |
283 | ||
284 | /* save device in the file's private structure */ | |
285 | file->private_data = dev; | |
286 | ||
ebc3ac14 ON |
287 | if (dev->open_count == 1) { |
288 | /* initialize in direction */ | |
289 | dev->read_buffer_length = 0; | |
03270634 | 290 | |
ebc3ac14 ON |
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 | retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL); | |
302 | if (retval) | |
303 | --dev->open_count; | |
304 | } | |
8293c568 | 305 | mutex_unlock(&dev->mtx); |
03270634 SH |
306 | |
307 | exit_no_device: | |
03270634 SH |
308 | dbg(2,"%s : leave, return value %d ", __FUNCTION__, retval); |
309 | ||
310 | return retval; | |
311 | } | |
312 | ||
313 | static int adu_release_internal(struct adu_device *dev) | |
314 | { | |
315 | int retval = 0; | |
316 | ||
317 | dbg(2," %s : enter", __FUNCTION__); | |
318 | ||
03270634 SH |
319 | /* decrement our usage count for the device */ |
320 | --dev->open_count; | |
321 | dbg(2," %s : open count %d", __FUNCTION__, dev->open_count); | |
322 | if (dev->open_count <= 0) { | |
323 | adu_abort_transfers(dev); | |
324 | dev->open_count = 0; | |
325 | } | |
326 | ||
03270634 SH |
327 | dbg(2," %s : leave", __FUNCTION__); |
328 | return retval; | |
329 | } | |
330 | ||
331 | static int adu_release(struct inode *inode, struct file *file) | |
332 | { | |
333 | struct adu_device *dev = NULL; | |
334 | int retval = 0; | |
335 | ||
336 | dbg(2," %s : enter", __FUNCTION__); | |
337 | ||
338 | if (file == NULL) { | |
339 | dbg(1," %s : file is NULL", __FUNCTION__); | |
340 | retval = -ENODEV; | |
341 | goto exit; | |
342 | } | |
343 | ||
344 | dev = file->private_data; | |
345 | ||
346 | if (dev == NULL) { | |
347 | dbg(1," %s : object is NULL", __FUNCTION__); | |
348 | retval = -ENODEV; | |
349 | goto exit; | |
350 | } | |
351 | ||
352 | /* lock our device */ | |
8293c568 | 353 | mutex_lock(&dev->mtx); /* not interruptible */ |
03270634 SH |
354 | |
355 | if (dev->open_count <= 0) { | |
356 | dbg(1," %s : device not opened", __FUNCTION__); | |
357 | retval = -ENODEV; | |
358 | goto exit; | |
359 | } | |
360 | ||
d4ead16f AS |
361 | if (dev->udev == NULL) { |
362 | /* the device was unplugged before the file was released */ | |
8293c568 | 363 | mutex_unlock(&dev->mtx); |
d4ead16f AS |
364 | adu_delete(dev); |
365 | dev = NULL; | |
366 | } else { | |
367 | /* do the work */ | |
368 | retval = adu_release_internal(dev); | |
369 | } | |
03270634 SH |
370 | |
371 | exit: | |
a65dc301 | 372 | if (dev) |
8293c568 | 373 | mutex_unlock(&dev->mtx); |
03270634 SH |
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 */ | |
8293c568 | 396 | if (mutex_lock_interruptible(&dev->mtx)) |
03270634 SH |
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); | |
ebc3ac14 | 471 | retval = usb_submit_urb(dev->interrupt_in_urb, GFP_ATOMIC); |
03270634 SH |
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 */ | |
8293c568 | 528 | mutex_unlock(&dev->mtx); |
03270634 SH |
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; | |
ebc3ac14 | 541 | int retval; |
03270634 SH |
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 */ | |
8293c568 | 549 | retval = mutex_lock_interruptible(&dev->mtx); |
ebc3ac14 ON |
550 | if (retval) |
551 | goto exit_nolock; | |
03270634 SH |
552 | |
553 | /* verify that the device wasn't unplugged */ | |
554 | if (dev->udev == NULL || dev->minor == 0) { | |
555 | retval = -ENODEV; | |
556 | err("No device or device unplugged %d", retval); | |
557 | goto exit; | |
558 | } | |
559 | ||
560 | /* verify that we actually have some data to write */ | |
561 | if (count == 0) { | |
562 | dbg(1," %s : write request of 0 bytes", __FUNCTION__); | |
563 | goto exit; | |
564 | } | |
565 | ||
566 | ||
567 | while (count > 0) { | |
568 | if (dev->interrupt_out_urb->status == -EINPROGRESS) { | |
569 | timeout = COMMAND_TIMEOUT; | |
570 | ||
571 | while (timeout > 0) { | |
572 | if (signal_pending(current)) { | |
573 | dbg(1," %s : interrupted", __FUNCTION__); | |
574 | retval = -EINTR; | |
575 | goto exit; | |
576 | } | |
8293c568 | 577 | mutex_unlock(&dev->mtx); |
03270634 | 578 | timeout = interruptible_sleep_on_timeout(&dev->write_wait, timeout); |
8293c568 | 579 | retval = mutex_lock_interruptible(&dev->mtx); |
ebc3ac14 ON |
580 | if (retval) { |
581 | retval = bytes_written ? bytes_written : retval; | |
582 | goto exit_nolock; | |
583 | } | |
03270634 SH |
584 | if (timeout > 0) { |
585 | break; | |
586 | } | |
587 | dbg(1," %s : interrupted timeout: %d", __FUNCTION__, timeout); | |
588 | } | |
589 | ||
590 | ||
591 | dbg(1," %s : final timeout: %d", __FUNCTION__, timeout); | |
592 | ||
593 | if (timeout == 0) { | |
594 | dbg(1, "%s - command timed out.", __FUNCTION__); | |
595 | retval = -ETIMEDOUT; | |
596 | goto exit; | |
597 | } | |
598 | ||
599 | dbg(4," %s : in progress, count = %Zd", __FUNCTION__, count); | |
600 | ||
601 | } else { | |
602 | dbg(4," %s : sending, count = %Zd", __FUNCTION__, count); | |
603 | ||
604 | /* write the data into interrupt_out_buffer from userspace */ | |
605 | buffer_size = le16_to_cpu(dev->interrupt_out_endpoint->wMaxPacketSize); | |
606 | bytes_to_write = count > buffer_size ? buffer_size : count; | |
607 | dbg(4," %s : buffer_size = %Zd, count = %Zd, bytes_to_write = %Zd", | |
608 | __FUNCTION__, buffer_size, count, bytes_to_write); | |
609 | ||
610 | if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write) != 0) { | |
611 | retval = -EFAULT; | |
612 | goto exit; | |
613 | } | |
614 | ||
615 | /* send off the urb */ | |
616 | usb_fill_int_urb( | |
617 | dev->interrupt_out_urb, | |
618 | dev->udev, | |
619 | usb_sndintpipe(dev->udev, dev->interrupt_out_endpoint->bEndpointAddress), | |
620 | dev->interrupt_out_buffer, | |
621 | bytes_to_write, | |
622 | adu_interrupt_out_callback, | |
623 | dev, | |
624 | dev->interrupt_in_endpoint->bInterval); | |
625 | /* dev->interrupt_in_urb->transfer_flags |= URB_ASYNC_UNLINK; */ | |
626 | dev->interrupt_out_urb->actual_length = bytes_to_write; | |
627 | retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL); | |
628 | if (retval < 0) { | |
629 | err("Couldn't submit interrupt_out_urb %d", retval); | |
630 | goto exit; | |
631 | } | |
632 | ||
633 | buffer += bytes_to_write; | |
634 | count -= bytes_to_write; | |
635 | ||
636 | bytes_written += bytes_to_write; | |
637 | } | |
638 | } | |
639 | ||
640 | retval = bytes_written; | |
641 | ||
642 | exit: | |
643 | /* unlock the device */ | |
8293c568 | 644 | mutex_unlock(&dev->mtx); |
ebc3ac14 | 645 | exit_nolock: |
03270634 SH |
646 | |
647 | dbg(2," %s : leave, return value %d", __FUNCTION__, retval); | |
648 | ||
649 | return retval; | |
650 | } | |
651 | ||
652 | /* file operations needed when we register this driver */ | |
00977a59 | 653 | static const struct file_operations adu_fops = { |
03270634 SH |
654 | .owner = THIS_MODULE, |
655 | .read = adu_read, | |
656 | .write = adu_write, | |
657 | .open = adu_open, | |
658 | .release = adu_release, | |
659 | }; | |
660 | ||
661 | /* | |
662 | * usb class driver info in order to get a minor number from the usb core, | |
663 | * and to have the device registered with devfs and the driver core | |
664 | */ | |
665 | static struct usb_class_driver adu_class = { | |
666 | .name = "usb/adutux%d", | |
667 | .fops = &adu_fops, | |
668 | .minor_base = ADU_MINOR_BASE, | |
669 | }; | |
670 | ||
671 | /** | |
672 | * adu_probe | |
673 | * | |
674 | * Called by the usb core when a new device is connected that it thinks | |
675 | * this driver might be interested in. | |
676 | */ | |
677 | static int adu_probe(struct usb_interface *interface, | |
678 | const struct usb_device_id *id) | |
679 | { | |
680 | struct usb_device *udev = interface_to_usbdev(interface); | |
681 | struct adu_device *dev = NULL; | |
682 | struct usb_host_interface *iface_desc; | |
683 | struct usb_endpoint_descriptor *endpoint; | |
684 | int retval = -ENODEV; | |
685 | int in_end_size; | |
686 | int out_end_size; | |
687 | int i; | |
688 | ||
689 | dbg(2," %s : enter", __FUNCTION__); | |
690 | ||
691 | if (udev == NULL) { | |
692 | dev_err(&interface->dev, "udev is NULL.\n"); | |
693 | goto exit; | |
694 | } | |
695 | ||
696 | /* allocate memory for our device state and intialize it */ | |
697 | dev = kzalloc(sizeof(struct adu_device), GFP_KERNEL); | |
698 | if (dev == NULL) { | |
699 | dev_err(&interface->dev, "Out of memory\n"); | |
700 | retval = -ENOMEM; | |
701 | goto exit; | |
702 | } | |
703 | ||
8293c568 | 704 | mutex_init(&dev->mtx); |
03270634 SH |
705 | spin_lock_init(&dev->buflock); |
706 | dev->udev = udev; | |
707 | init_waitqueue_head(&dev->read_wait); | |
708 | init_waitqueue_head(&dev->write_wait); | |
709 | ||
710 | iface_desc = &interface->altsetting[0]; | |
711 | ||
712 | /* set up the endpoint information */ | |
713 | for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { | |
714 | endpoint = &iface_desc->endpoint[i].desc; | |
715 | ||
716 | if (usb_endpoint_is_int_in(endpoint)) | |
717 | dev->interrupt_in_endpoint = endpoint; | |
718 | ||
719 | if (usb_endpoint_is_int_out(endpoint)) | |
720 | dev->interrupt_out_endpoint = endpoint; | |
721 | } | |
722 | if (dev->interrupt_in_endpoint == NULL) { | |
723 | dev_err(&interface->dev, "interrupt in endpoint not found\n"); | |
724 | goto error; | |
725 | } | |
726 | if (dev->interrupt_out_endpoint == NULL) { | |
727 | dev_err(&interface->dev, "interrupt out endpoint not found\n"); | |
728 | goto error; | |
729 | } | |
730 | ||
731 | in_end_size = le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize); | |
732 | out_end_size = le16_to_cpu(dev->interrupt_out_endpoint->wMaxPacketSize); | |
733 | ||
734 | dev->read_buffer_primary = kmalloc((4 * in_end_size), GFP_KERNEL); | |
735 | if (!dev->read_buffer_primary) { | |
736 | dev_err(&interface->dev, "Couldn't allocate read_buffer_primary\n"); | |
737 | retval = -ENOMEM; | |
738 | goto error; | |
739 | } | |
740 | ||
741 | /* debug code prime the buffer */ | |
742 | memset(dev->read_buffer_primary, 'a', in_end_size); | |
743 | memset(dev->read_buffer_primary + in_end_size, 'b', in_end_size); | |
744 | memset(dev->read_buffer_primary + (2 * in_end_size), 'c', in_end_size); | |
745 | memset(dev->read_buffer_primary + (3 * in_end_size), 'd', in_end_size); | |
746 | ||
747 | dev->read_buffer_secondary = kmalloc((4 * in_end_size), GFP_KERNEL); | |
748 | if (!dev->read_buffer_secondary) { | |
749 | dev_err(&interface->dev, "Couldn't allocate read_buffer_secondary\n"); | |
750 | retval = -ENOMEM; | |
751 | goto error; | |
752 | } | |
753 | ||
754 | /* debug code prime the buffer */ | |
755 | memset(dev->read_buffer_secondary, 'e', in_end_size); | |
756 | memset(dev->read_buffer_secondary + in_end_size, 'f', in_end_size); | |
757 | memset(dev->read_buffer_secondary + (2 * in_end_size), 'g', in_end_size); | |
758 | memset(dev->read_buffer_secondary + (3 * in_end_size), 'h', in_end_size); | |
759 | ||
760 | dev->interrupt_in_buffer = kmalloc(in_end_size, GFP_KERNEL); | |
761 | if (!dev->interrupt_in_buffer) { | |
762 | dev_err(&interface->dev, "Couldn't allocate interrupt_in_buffer\n"); | |
763 | goto error; | |
764 | } | |
765 | ||
766 | /* debug code prime the buffer */ | |
767 | memset(dev->interrupt_in_buffer, 'i', in_end_size); | |
768 | ||
769 | dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL); | |
770 | if (!dev->interrupt_in_urb) { | |
771 | dev_err(&interface->dev, "Couldn't allocate interrupt_in_urb\n"); | |
772 | goto error; | |
773 | } | |
774 | dev->interrupt_out_buffer = kmalloc(out_end_size, GFP_KERNEL); | |
775 | if (!dev->interrupt_out_buffer) { | |
776 | dev_err(&interface->dev, "Couldn't allocate interrupt_out_buffer\n"); | |
777 | goto error; | |
778 | } | |
779 | dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL); | |
780 | if (!dev->interrupt_out_urb) { | |
781 | dev_err(&interface->dev, "Couldn't allocate interrupt_out_urb\n"); | |
782 | goto error; | |
783 | } | |
784 | ||
785 | if (!usb_string(udev, udev->descriptor.iSerialNumber, dev->serial_number, | |
786 | sizeof(dev->serial_number))) { | |
787 | dev_err(&interface->dev, "Could not retrieve serial number\n"); | |
788 | goto error; | |
789 | } | |
790 | dbg(2," %s : serial_number=%s", __FUNCTION__, dev->serial_number); | |
791 | ||
792 | /* we can register the device now, as it is ready */ | |
793 | usb_set_intfdata(interface, dev); | |
794 | ||
795 | retval = usb_register_dev(interface, &adu_class); | |
796 | ||
797 | if (retval) { | |
798 | /* something prevented us from registering this driver */ | |
799 | dev_err(&interface->dev, "Not able to get a minor for this device.\n"); | |
800 | usb_set_intfdata(interface, NULL); | |
801 | goto error; | |
802 | } | |
803 | ||
804 | dev->minor = interface->minor; | |
805 | ||
806 | /* let the user know what node this device is now attached to */ | |
807 | dev_info(&interface->dev, "ADU%d %s now attached to /dev/usb/adutux%d", | |
808 | udev->descriptor.idProduct, dev->serial_number, | |
809 | (dev->minor - ADU_MINOR_BASE)); | |
810 | exit: | |
811 | dbg(2," %s : leave, return value %p (dev)", __FUNCTION__, dev); | |
812 | ||
813 | return retval; | |
814 | ||
815 | error: | |
816 | adu_delete(dev); | |
817 | return retval; | |
818 | } | |
819 | ||
820 | /** | |
821 | * adu_disconnect | |
822 | * | |
823 | * Called by the usb core when the device is removed from the system. | |
824 | */ | |
825 | static void adu_disconnect(struct usb_interface *interface) | |
826 | { | |
827 | struct adu_device *dev; | |
828 | int minor; | |
829 | ||
830 | dbg(2," %s : enter", __FUNCTION__); | |
831 | ||
03270634 SH |
832 | dev = usb_get_intfdata(interface); |
833 | usb_set_intfdata(interface, NULL); | |
834 | ||
03270634 SH |
835 | minor = dev->minor; |
836 | ||
837 | /* give back our minor */ | |
838 | usb_deregister_dev(interface, &adu_class); | |
839 | dev->minor = 0; | |
840 | ||
8293c568 | 841 | mutex_lock(&dev->mtx); /* not interruptible */ |
d4ead16f | 842 | |
03270634 SH |
843 | /* if the device is not opened, then we clean up right now */ |
844 | dbg(2," %s : open count %d", __FUNCTION__, dev->open_count); | |
845 | if (!dev->open_count) { | |
8293c568 | 846 | mutex_unlock(&dev->mtx); |
03270634 SH |
847 | adu_delete(dev); |
848 | } else { | |
849 | dev->udev = NULL; | |
8293c568 | 850 | mutex_unlock(&dev->mtx); |
03270634 SH |
851 | } |
852 | ||
03270634 SH |
853 | dev_info(&interface->dev, "ADU device adutux%d now disconnected", |
854 | (minor - ADU_MINOR_BASE)); | |
855 | ||
856 | dbg(2," %s : leave", __FUNCTION__); | |
857 | } | |
858 | ||
859 | /* usb specific object needed to register this driver with the usb subsystem */ | |
860 | static struct usb_driver adu_driver = { | |
861 | .name = "adutux", | |
862 | .probe = adu_probe, | |
863 | .disconnect = adu_disconnect, | |
864 | .id_table = device_table, | |
865 | }; | |
866 | ||
867 | static int __init adu_init(void) | |
868 | { | |
869 | int result; | |
870 | ||
871 | dbg(2," %s : enter", __FUNCTION__); | |
872 | ||
873 | /* register this driver with the USB subsystem */ | |
874 | result = usb_register(&adu_driver); | |
875 | if (result < 0) { | |
876 | err("usb_register failed for the "__FILE__" driver. " | |
877 | "Error number %d", result); | |
878 | goto exit; | |
879 | } | |
880 | ||
881 | info("adutux " DRIVER_DESC " " DRIVER_VERSION); | |
882 | info("adutux is an experimental driver. Use at your own risk"); | |
883 | ||
884 | exit: | |
885 | dbg(2," %s : leave, return value %d", __FUNCTION__, result); | |
886 | ||
887 | return result; | |
888 | } | |
889 | ||
890 | static void __exit adu_exit(void) | |
891 | { | |
892 | dbg(2," %s : enter", __FUNCTION__); | |
893 | /* deregister this driver with the USB subsystem */ | |
894 | usb_deregister(&adu_driver); | |
895 | dbg(2," %s : leave", __FUNCTION__); | |
896 | } | |
897 | ||
898 | module_init(adu_init); | |
899 | module_exit(adu_exit); | |
900 | ||
901 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
902 | MODULE_DESCRIPTION(DRIVER_DESC); | |
903 | MODULE_LICENSE("GPL"); |