Commit | Line | Data |
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8da3dc28 DT |
1 | /* |
2 | * Frontier Designs Alphatrack driver | |
3 | * | |
4 | * Copyright (C) 2007 Michael Taht (m@taht.net) | |
5 | * | |
6 | * Based on the usbled driver and ldusb drivers by | |
7 | * | |
8 | * Copyright (C) 2004 Greg Kroah-Hartman (greg@kroah.com) | |
9 | * Copyright (C) 2005 Michael Hund <mhund@ld-didactic.de> | |
10 | * | |
11 | * The ldusb driver was, in turn, derived from Lego USB Tower driver | |
12 | * Copyright (C) 2003 David Glance <advidgsf@sourceforge.net> | |
13 | * 2001-2004 Juergen Stuber <starblue@users.sourceforge.net> | |
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, version 2. | |
18 | * | |
19 | */ | |
20 | ||
21 | /** | |
22 | * This driver uses a ring buffer for time critical reading of | |
23 | * interrupt in reports and provides read and write methods for | |
24 | * raw interrupt reports. | |
25 | */ | |
26 | ||
27 | /* Note: this currently uses a dumb ringbuffer for reads and writes. | |
28 | * A more optimal driver would cache and kill off outstanding urbs that are | |
29 | * now invalid, and ignore ones that already were in the queue but valid | |
30 | * as we only have 30 commands for the alphatrack. In particular this is | |
31 | * key for getting lights to flash in time as otherwise many commands | |
32 | * can be buffered up before the light change makes it to the interface. | |
33 | */ | |
34 | ||
35 | #include <linux/kernel.h> | |
36 | #include <linux/errno.h> | |
37 | #include <linux/init.h> | |
38 | #include <linux/slab.h> | |
39 | #include <linux/module.h> | |
40 | #include <linux/kobject.h> | |
41 | #include <linux/mutex.h> | |
42 | #include <linux/version.h> | |
43 | ||
44 | #include <asm/uaccess.h> | |
45 | #include <linux/input.h> | |
46 | #include <linux/usb.h> | |
47 | #include <linux/poll.h> | |
48 | ||
49 | #include "surface_sysfs.h" | |
50 | ||
51 | /* make this work on older kernel versions */ | |
52 | ||
53 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19) | |
54 | #include "frontier_compat.h" | |
55 | #endif /* older kernel versions */ | |
56 | ||
57 | #include "alphatrack.h" | |
58 | ||
59 | #define VENDOR_ID 0x165b | |
60 | #define PRODUCT_ID 0xfad1 | |
61 | ||
62 | #ifdef CONFIG_USB_DYNAMIC_MINORS | |
63 | #define USB_ALPHATRACK_MINOR_BASE 0 | |
64 | #else | |
65 | // FIXME 176 - is another driver's minor - apply for that | |
66 | // #define USB_ALPHATRACK_MINOR_BASE 177 | |
67 | #define USB_ALPHATRACK_MINOR_BASE 176 | |
68 | #endif | |
69 | ||
70 | /* table of devices that work with this driver */ | |
71 | static struct usb_device_id usb_alphatrack_table [] = { | |
72 | { USB_DEVICE(VENDOR_ID, PRODUCT_ID) }, | |
73 | { } /* Terminating entry */ | |
74 | }; | |
75 | ||
76 | MODULE_DEVICE_TABLE(usb, usb_alphatrack_table); | |
77 | MODULE_VERSION("0.40"); | |
78 | MODULE_AUTHOR("Mike Taht <m@taht.net>"); | |
79 | MODULE_DESCRIPTION("Alphatrack USB Driver"); | |
80 | MODULE_LICENSE("GPL"); | |
81 | MODULE_SUPPORTED_DEVICE("Frontier Designs Alphatrack Control Surface"); | |
82 | ||
83 | /* These aren't done yet */ | |
84 | ||
8da3dc28 DT |
85 | #define SUPPRESS_EXTRA_ONLINE_EVENTS 0 |
86 | #define BUFFERED_WRITES 0 | |
87 | #define SUPPRESS_EXTRA_OFFLINE_EVENTS 0 | |
88 | #define COMPRESS_FADER_EVENTS 0 | |
89 | ||
90 | #define BUFFERED_READS 1 | |
91 | #define RING_BUFFER_SIZE 512 | |
92 | #define WRITE_BUFFER_SIZE 34 | |
93 | #define ALPHATRACK_USB_TIMEOUT 10 | |
94 | #define OUTPUT_CMD_SIZE 8 | |
95 | #define INPUT_CMD_SIZE 12 | |
96 | ||
97 | ||
98 | static int debug = 0; | |
99 | ||
100 | /* Use our own dbg macro */ | |
101 | #define dbg_info(dev, format, arg...) do { if (debug) dev_info(dev , format , ## arg); } while (0) | |
102 | ||
8da3dc28 DT |
103 | #define alphatrack_ocmd_info(dev, cmd, format, arg...) |
104 | ||
105 | #define alphatrack_icmd_info(dev, cmd, format, arg...) | |
106 | ||
8da3dc28 DT |
107 | |
108 | /* Module parameters */ | |
109 | ||
110 | module_param(debug, int, S_IRUGO | S_IWUSR); | |
111 | MODULE_PARM_DESC(debug, "Debug enabled or not"); | |
112 | ||
113 | /* All interrupt in transfers are collected in a ring buffer to | |
114 | * avoid racing conditions and get better performance of the driver. | |
115 | */ | |
116 | ||
117 | static int ring_buffer_size = RING_BUFFER_SIZE; | |
118 | ||
119 | module_param(ring_buffer_size, int, S_IRUGO); | |
120 | MODULE_PARM_DESC(ring_buffer_size, "Read ring buffer size"); | |
121 | ||
122 | /* The write_buffer can one day contain more than one interrupt out transfer. | |
123 | */ | |
124 | ||
125 | static int write_buffer_size = WRITE_BUFFER_SIZE; | |
126 | module_param(write_buffer_size, int, S_IRUGO); | |
127 | MODULE_PARM_DESC(write_buffer_size, "Write buffer size"); | |
128 | ||
129 | /* | |
130 | * Increase the interval for debugging purposes. | |
131 | * or set to 1 to use the standard interval from the endpoint descriptors. | |
132 | */ | |
133 | ||
134 | static int min_interrupt_in_interval = ALPHATRACK_USB_TIMEOUT; | |
135 | module_param(min_interrupt_in_interval, int, 0); | |
136 | MODULE_PARM_DESC(min_interrupt_in_interval, "Minimum interrupt in interval in ms"); | |
137 | ||
138 | static int min_interrupt_out_interval = ALPHATRACK_USB_TIMEOUT; | |
139 | module_param(min_interrupt_out_interval, int, 0); | |
140 | MODULE_PARM_DESC(min_interrupt_out_interval, "Minimum interrupt out interval in ms"); | |
141 | ||
142 | ||
143 | ||
144 | /* Structure to hold all of our device specific stuff */ | |
145 | ||
146 | struct usb_alphatrack { | |
147 | struct semaphore sem; /* locks this structure */ | |
148 | struct usb_interface* intf; /* save off the usb interface pointer */ | |
149 | int open_count; /* number of times this port has been opened */ | |
150 | ||
151 | struct alphatrack_icmd (*ring_buffer)[RING_BUFFER_SIZE]; /* just make c happy */ | |
152 | struct alphatrack_ocmd (*write_buffer)[WRITE_BUFFER_SIZE]; /* just make c happy */ | |
153 | unsigned int ring_head; | |
154 | unsigned int ring_tail; | |
155 | ||
156 | wait_queue_head_t read_wait; | |
157 | wait_queue_head_t write_wait; | |
158 | ||
159 | unsigned char* interrupt_in_buffer; | |
160 | unsigned char* oldi_buffer; | |
161 | struct usb_endpoint_descriptor* interrupt_in_endpoint; | |
162 | struct urb* interrupt_in_urb; | |
163 | int interrupt_in_interval; | |
164 | size_t interrupt_in_endpoint_size; | |
165 | int interrupt_in_running; | |
166 | int interrupt_in_done; | |
167 | ||
168 | char* interrupt_out_buffer; | |
169 | struct usb_endpoint_descriptor* interrupt_out_endpoint; | |
170 | struct urb* interrupt_out_urb; | |
171 | int interrupt_out_interval; | |
172 | size_t interrupt_out_endpoint_size; | |
173 | int interrupt_out_busy; | |
174 | ||
175 | atomic_t writes_pending; | |
176 | int event; /* alternate interface to events */ | |
177 | int fader; /* 10 bits */ | |
178 | int lights; /* 23 bits */ | |
179 | unsigned char dump_state; /* 0 if disabled 1 if enabled */ | |
180 | unsigned char enable; /* 0 if disabled 1 if enabled */ | |
181 | unsigned char offline; /* if the device is out of range or asleep */ | |
182 | unsigned char verbose; /* be verbose in error reporting */ | |
183 | unsigned char last_cmd[OUTPUT_CMD_SIZE]; | |
184 | unsigned char screen[32]; | |
185 | }; | |
186 | ||
187 | /* prevent races between open() and disconnect() */ | |
188 | static DEFINE_MUTEX(disconnect_mutex); | |
189 | ||
190 | /* forward declaration */ | |
191 | ||
192 | static struct usb_driver usb_alphatrack_driver; | |
193 | ||
8da3dc28 DT |
194 | /** |
195 | * usb_alphatrack_abort_transfers | |
196 | * aborts transfers and frees associated data structures | |
197 | */ | |
198 | static void usb_alphatrack_abort_transfers(struct usb_alphatrack *dev) | |
199 | { | |
200 | /* shutdown transfer */ | |
201 | if (dev->interrupt_in_running) { | |
202 | dev->interrupt_in_running = 0; | |
203 | if (dev->intf) | |
204 | usb_kill_urb(dev->interrupt_in_urb); | |
205 | } | |
206 | if (dev->interrupt_out_busy) | |
207 | if (dev->intf) | |
208 | usb_kill_urb(dev->interrupt_out_urb); | |
209 | } | |
210 | ||
8da3dc28 DT |
211 | /** |
212 | * usb_alphatrack_delete | |
213 | */ | |
214 | static void usb_alphatrack_delete(struct usb_alphatrack *dev) | |
215 | { | |
216 | usb_alphatrack_abort_transfers(dev); | |
217 | usb_free_urb(dev->interrupt_in_urb); | |
218 | usb_free_urb(dev->interrupt_out_urb); | |
219 | kfree(dev->ring_buffer); | |
220 | kfree(dev->interrupt_in_buffer); | |
221 | kfree(dev->interrupt_out_buffer); | |
222 | kfree(dev); // fixme oldi_buffer | |
223 | } | |
224 | ||
225 | /** | |
226 | * usb_alphatrack_interrupt_in_callback | |
227 | */ | |
228 | ||
229 | static void usb_alphatrack_interrupt_in_callback(struct urb *urb) | |
230 | { | |
231 | struct usb_alphatrack *dev = urb->context; | |
232 | unsigned int next_ring_head; | |
233 | int retval = -1; | |
8da3dc28 DT |
234 | |
235 | if (urb->status) { | |
236 | if (urb->status == -ENOENT || | |
237 | urb->status == -ECONNRESET || | |
238 | urb->status == -ESHUTDOWN) { | |
239 | goto exit; | |
240 | } else { | |
241 | dbg_info(&dev->intf->dev, "%s: nonzero status received: %d\n", | |
d599edca | 242 | __func__, urb->status); |
8da3dc28 DT |
243 | goto resubmit; /* maybe we can recover */ |
244 | } | |
245 | } | |
246 | ||
247 | if (urb->actual_length != INPUT_CMD_SIZE) { | |
248 | dev_warn(&dev->intf->dev, | |
249 | "Urb length was %d bytes!! Do something intelligent \n", urb->actual_length); | |
250 | } else { | |
251 | alphatrack_ocmd_info(&dev->intf->dev,&(*dev->ring_buffer)[dev->ring_tail].cmd,"%s", "bla"); | |
252 | if(memcmp(dev->interrupt_in_buffer,dev->oldi_buffer,INPUT_CMD_SIZE)==0) { | |
253 | goto resubmit; | |
254 | } | |
255 | memcpy(dev->oldi_buffer,dev->interrupt_in_buffer,INPUT_CMD_SIZE); | |
256 | ||
257 | #if SUPPRESS_EXTRA_OFFLINE_EVENTS | |
258 | if(dev->offline == 2 && dev->interrupt_in_buffer[1] == 0xff) { goto resubmit; } | |
259 | if(dev->offline == 1 && dev->interrupt_in_buffer[1] == 0xff) { dev->offline = 2; goto resubmit; } | |
260 | /* Always pass one offline event up the stack */ | |
261 | if(dev->offline > 0 && dev->interrupt_in_buffer[1] != 0xff) { dev->offline = 0; } | |
262 | if(dev->offline == 0 && dev->interrupt_in_buffer[1] == 0xff) { dev->offline = 1; } | |
263 | #endif | |
d599edca | 264 | dbg_info(&dev->intf->dev, "%s: head, tail are %x, %x\n", __func__,dev->ring_head,dev->ring_tail); |
8da3dc28 DT |
265 | next_ring_head = (dev->ring_head+1) % ring_buffer_size; |
266 | ||
267 | if (next_ring_head != dev->ring_tail) { | |
268 | memcpy(&((*dev->ring_buffer)[dev->ring_head]), | |
269 | dev->interrupt_in_buffer, urb->actual_length); | |
270 | dev->ring_head = next_ring_head; | |
271 | retval = 0; | |
272 | memset(dev->interrupt_in_buffer, 0, urb->actual_length); | |
273 | } else { | |
274 | dev_warn(&dev->intf->dev, | |
275 | "Ring buffer overflow, %d bytes dropped\n", | |
276 | urb->actual_length); | |
277 | memset(dev->interrupt_in_buffer, 0, urb->actual_length); | |
278 | } | |
279 | } | |
280 | ||
281 | resubmit: | |
282 | /* resubmit if we're still running */ | |
283 | if (dev->interrupt_in_running && dev->intf) { | |
284 | retval = usb_submit_urb(dev->interrupt_in_urb, GFP_ATOMIC); | |
285 | if (retval) | |
286 | dev_err(&dev->intf->dev, | |
287 | "usb_submit_urb failed (%d)\n", retval); | |
288 | } | |
289 | ||
290 | exit: | |
291 | dev->interrupt_in_done = 1; | |
292 | wake_up_interruptible(&dev->read_wait); | |
293 | } | |
294 | ||
295 | /** | |
296 | * usb_alphatrack_interrupt_out_callback | |
297 | */ | |
298 | static void usb_alphatrack_interrupt_out_callback(struct urb *urb) | |
299 | { | |
300 | struct usb_alphatrack *dev = urb->context; | |
301 | ||
302 | /* sync/async unlink faults aren't errors */ | |
303 | if (urb->status && !(urb->status == -ENOENT || | |
304 | urb->status == -ECONNRESET || | |
305 | urb->status == -ESHUTDOWN)) | |
306 | dbg_info(&dev->intf->dev, | |
307 | "%s - nonzero write interrupt status received: %d\n", | |
d599edca | 308 | __func__, urb->status); |
8da3dc28 DT |
309 | atomic_dec(&dev->writes_pending); |
310 | dev->interrupt_out_busy = 0; | |
311 | wake_up_interruptible(&dev->write_wait); | |
312 | } | |
313 | ||
314 | /** | |
315 | * usb_alphatrack_open | |
316 | */ | |
317 | static int usb_alphatrack_open(struct inode *inode, struct file *file) | |
318 | { | |
319 | struct usb_alphatrack *dev; | |
320 | int subminor; | |
321 | int retval = 0; | |
322 | struct usb_interface *interface; | |
323 | ||
324 | nonseekable_open(inode, file); | |
325 | subminor = iminor(inode); | |
326 | ||
327 | mutex_lock(&disconnect_mutex); | |
328 | ||
329 | interface = usb_find_interface(&usb_alphatrack_driver, subminor); | |
330 | ||
331 | if (!interface) { | |
332 | err("%s - error, can't find device for minor %d\n", | |
d599edca | 333 | __func__, subminor); |
8da3dc28 DT |
334 | retval = -ENODEV; |
335 | goto unlock_disconnect_exit; | |
336 | } | |
337 | ||
338 | dev = usb_get_intfdata(interface); | |
339 | ||
340 | if (!dev) { | |
341 | retval = -ENODEV; | |
342 | goto unlock_disconnect_exit; | |
343 | } | |
344 | ||
345 | /* lock this device */ | |
346 | if (down_interruptible(&dev->sem)) { | |
347 | retval = -ERESTARTSYS; | |
348 | goto unlock_disconnect_exit; | |
349 | } | |
350 | ||
351 | /* allow opening only once */ | |
352 | if (dev->open_count) { | |
353 | retval = -EBUSY; | |
354 | goto unlock_exit; | |
355 | } | |
356 | dev->open_count = 1; | |
357 | ||
358 | /* initialize in direction */ | |
359 | dev->ring_head = 0; | |
360 | dev->ring_tail = 0; | |
361 | usb_fill_int_urb(dev->interrupt_in_urb, | |
362 | interface_to_usbdev(interface), | |
363 | usb_rcvintpipe(interface_to_usbdev(interface), | |
364 | dev->interrupt_in_endpoint->bEndpointAddress), | |
365 | dev->interrupt_in_buffer, | |
366 | dev->interrupt_in_endpoint_size, | |
367 | usb_alphatrack_interrupt_in_callback, | |
368 | dev, | |
369 | dev->interrupt_in_interval); | |
370 | ||
371 | dev->interrupt_in_running = 1; | |
372 | dev->interrupt_in_done = 0; | |
373 | dev->enable = 1; | |
374 | dev->offline = 0; | |
375 | ||
376 | retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL); | |
377 | if (retval) { | |
378 | dev_err(&interface->dev, "Couldn't submit interrupt_in_urb %d\n", retval); | |
379 | dev->interrupt_in_running = 0; | |
380 | dev->open_count = 0; | |
381 | goto unlock_exit; | |
382 | } | |
383 | ||
384 | /* save device in the file's private structure */ | |
385 | file->private_data = dev; | |
386 | ||
387 | ||
388 | unlock_exit: | |
389 | up(&dev->sem); | |
390 | ||
391 | unlock_disconnect_exit: | |
392 | mutex_unlock(&disconnect_mutex); | |
393 | ||
394 | return retval; | |
395 | } | |
396 | ||
397 | /** | |
398 | * usb_alphatrack_release | |
399 | */ | |
400 | static int usb_alphatrack_release(struct inode *inode, struct file *file) | |
401 | { | |
402 | struct usb_alphatrack *dev; | |
403 | int retval = 0; | |
404 | ||
405 | dev = file->private_data; | |
406 | ||
407 | if (dev == NULL) { | |
408 | retval = -ENODEV; | |
409 | goto exit; | |
410 | } | |
411 | ||
412 | if (down_interruptible(&dev->sem)) { | |
413 | retval = -ERESTARTSYS; | |
414 | goto exit; | |
415 | } | |
416 | ||
417 | if (dev->open_count != 1) { | |
418 | retval = -ENODEV; | |
419 | goto unlock_exit; | |
420 | } | |
421 | ||
422 | if (dev->intf == NULL) { | |
423 | /* the device was unplugged before the file was released */ | |
424 | up(&dev->sem); | |
425 | /* unlock here as usb_alphatrack_delete frees dev */ | |
426 | usb_alphatrack_delete(dev); | |
427 | retval = -ENODEV; | |
428 | goto exit; | |
429 | } | |
430 | ||
431 | /* wait until write transfer is finished */ | |
432 | if (dev->interrupt_out_busy) | |
433 | wait_event_interruptible_timeout(dev->write_wait, !dev->interrupt_out_busy, 2 * HZ); | |
434 | usb_alphatrack_abort_transfers(dev); | |
435 | dev->open_count = 0; | |
436 | ||
437 | unlock_exit: | |
438 | up(&dev->sem); | |
439 | ||
440 | exit: | |
441 | return retval; | |
442 | } | |
443 | ||
444 | /** | |
445 | * usb_alphatrack_poll | |
446 | */ | |
447 | static unsigned int usb_alphatrack_poll(struct file *file, poll_table *wait) | |
448 | { | |
449 | struct usb_alphatrack *dev; | |
450 | unsigned int mask = 0; | |
451 | ||
452 | dev = file->private_data; | |
453 | ||
454 | poll_wait(file, &dev->read_wait, wait); | |
455 | poll_wait(file, &dev->write_wait, wait); | |
456 | ||
457 | if (dev->ring_head != dev->ring_tail) | |
458 | mask |= POLLIN | POLLRDNORM; | |
459 | if (!dev->interrupt_out_busy) | |
460 | mask |= POLLOUT | POLLWRNORM; | |
461 | ||
462 | return mask; | |
463 | } | |
464 | ||
465 | /** | |
466 | * usb_alphatrack_read | |
467 | */ | |
468 | static ssize_t usb_alphatrack_read(struct file *file, char __user *buffer, size_t count, | |
469 | loff_t *ppos) | |
470 | { | |
471 | struct usb_alphatrack *dev; | |
472 | int retval = 0; | |
473 | ||
474 | int c = 0; | |
475 | ||
476 | dev = file->private_data; | |
477 | ||
478 | /* verify that we actually have some data to read */ | |
479 | if (count == 0) | |
480 | goto exit; | |
481 | ||
482 | /* lock this object */ | |
483 | if (down_interruptible(&dev->sem)) { | |
484 | retval = -ERESTARTSYS; | |
485 | goto exit; | |
486 | } | |
487 | ||
488 | /* verify that the device wasn't unplugged */ | |
489 | if (dev->intf == NULL) { | |
490 | retval = -ENODEV; | |
491 | err("No device or device unplugged %d\n", retval); | |
492 | goto unlock_exit; | |
493 | } | |
494 | ||
495 | while (dev->ring_head == dev->ring_tail) { | |
496 | if (file->f_flags & O_NONBLOCK) { | |
497 | retval = -EAGAIN; | |
498 | goto unlock_exit; | |
499 | } | |
500 | dev->interrupt_in_done = 0 ; | |
501 | retval = wait_event_interruptible(dev->read_wait, dev->interrupt_in_done); | |
502 | if (retval < 0) { | |
503 | goto unlock_exit; | |
504 | } | |
505 | } | |
506 | ||
507 | alphatrack_ocmd_info(&dev->intf->dev, &(*dev->ring_buffer)[dev->ring_tail].cmd, "%s", ": copying to userspace"); | |
508 | ||
509 | c = 0; | |
510 | while((c < count) && (dev->ring_tail != dev->ring_head)) { | |
511 | if (copy_to_user(&buffer[c], &(*dev->ring_buffer)[dev->ring_tail], INPUT_CMD_SIZE)) { | |
512 | retval = -EFAULT; | |
513 | goto unlock_exit; | |
514 | } | |
515 | dev->ring_tail = (dev->ring_tail+1) % ring_buffer_size; | |
516 | c+=INPUT_CMD_SIZE; | |
d599edca | 517 | dbg_info(&dev->intf->dev, "%s: head, tail are %x, %x\n", __func__,dev->ring_head,dev->ring_tail); |
8da3dc28 DT |
518 | } |
519 | retval = c; | |
520 | ||
521 | unlock_exit: | |
522 | /* unlock the device */ | |
523 | up(&dev->sem); | |
524 | ||
525 | exit: | |
526 | return retval; | |
527 | } | |
528 | ||
529 | /** | |
530 | * usb_alphatrack_write | |
531 | */ | |
532 | static ssize_t usb_alphatrack_write(struct file *file, const char __user *buffer, | |
533 | size_t count, loff_t *ppos) | |
534 | { | |
535 | struct usb_alphatrack *dev; | |
536 | size_t bytes_to_write; | |
537 | int retval = 0; | |
538 | ||
539 | dev = file->private_data; | |
540 | ||
541 | /* verify that we actually have some data to write */ | |
542 | if (count == 0) | |
543 | goto exit; | |
544 | ||
545 | /* lock this object */ | |
546 | if (down_interruptible(&dev->sem)) { | |
547 | retval = -ERESTARTSYS; | |
548 | goto exit; | |
549 | } | |
550 | ||
551 | /* verify that the device wasn't unplugged */ | |
552 | if (dev->intf == NULL) { | |
553 | retval = -ENODEV; | |
554 | err("No device or device unplugged %d\n", retval); | |
555 | goto unlock_exit; | |
556 | } | |
557 | ||
558 | /* wait until previous transfer is finished */ | |
559 | if (dev->interrupt_out_busy) { | |
560 | if (file->f_flags & O_NONBLOCK) { | |
561 | retval = -EAGAIN; | |
562 | goto unlock_exit; | |
563 | } | |
564 | retval = wait_event_interruptible(dev->write_wait, !dev->interrupt_out_busy); | |
565 | if (retval < 0) { | |
566 | goto unlock_exit; | |
567 | } | |
568 | } | |
569 | ||
570 | /* write the data into interrupt_out_buffer from userspace */ | |
571 | /* FIXME - if you write more than 12 bytes this breaks */ | |
572 | bytes_to_write = min(count, write_buffer_size*dev->interrupt_out_endpoint_size); | |
573 | if (bytes_to_write < count) | |
574 | dev_warn(&dev->intf->dev, "Write buffer overflow, %zd bytes dropped\n",count-bytes_to_write); | |
575 | ||
d599edca | 576 | dbg_info(&dev->intf->dev, "%s: count = %zd, bytes_to_write = %zd\n", __func__, count, bytes_to_write); |
8da3dc28 DT |
577 | |
578 | if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write)) { | |
579 | retval = -EFAULT; | |
580 | goto unlock_exit; | |
581 | } | |
582 | ||
583 | if (dev->interrupt_out_endpoint == NULL) { | |
584 | err("Endpoint should not be be null! \n"); | |
585 | goto unlock_exit; | |
586 | } | |
587 | ||
588 | /* send off the urb */ | |
589 | usb_fill_int_urb(dev->interrupt_out_urb, | |
590 | interface_to_usbdev(dev->intf), | |
591 | usb_sndintpipe(interface_to_usbdev(dev->intf), | |
592 | dev->interrupt_out_endpoint->bEndpointAddress), | |
593 | dev->interrupt_out_buffer, | |
594 | bytes_to_write, | |
595 | usb_alphatrack_interrupt_out_callback, | |
596 | dev, | |
597 | dev->interrupt_out_interval); | |
598 | dev->interrupt_out_busy = 1; | |
599 | atomic_inc(&dev->writes_pending); | |
600 | wmb(); | |
601 | ||
602 | retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL); | |
603 | if (retval) { | |
604 | dev->interrupt_out_busy = 0; | |
605 | err("Couldn't submit interrupt_out_urb %d\n", retval); | |
606 | atomic_dec(&dev->writes_pending); | |
607 | goto unlock_exit; | |
608 | } | |
609 | retval = bytes_to_write; | |
610 | ||
611 | unlock_exit: | |
612 | /* unlock the device */ | |
613 | up(&dev->sem); | |
614 | ||
615 | exit: | |
616 | return retval; | |
617 | } | |
618 | ||
619 | /* file operations needed when we register this driver */ | |
620 | static const struct file_operations usb_alphatrack_fops = { | |
621 | .owner = THIS_MODULE, | |
622 | .read = usb_alphatrack_read, | |
623 | .write = usb_alphatrack_write, | |
624 | .open = usb_alphatrack_open, | |
625 | .release = usb_alphatrack_release, | |
626 | .poll = usb_alphatrack_poll, | |
627 | }; | |
628 | ||
629 | /* | |
630 | * usb class driver info in order to get a minor number from the usb core, | |
631 | * and to have the device registered with the driver core | |
632 | */ | |
633 | ||
634 | static struct usb_class_driver usb_alphatrack_class = { | |
635 | .name = "alphatrack%d", | |
636 | .fops = &usb_alphatrack_fops, | |
637 | .minor_base = USB_ALPHATRACK_MINOR_BASE, | |
638 | }; | |
639 | ||
640 | ||
641 | /** | |
642 | * usb_alphatrack_probe | |
643 | * | |
644 | * Called by the usb core when a new device is connected that it thinks | |
645 | * this driver might be interested in. | |
646 | */ | |
647 | static int usb_alphatrack_probe(struct usb_interface *intf, const struct usb_device_id *id) | |
648 | { | |
649 | struct usb_device *udev = interface_to_usbdev(intf); | |
650 | struct usb_alphatrack *dev = NULL; | |
651 | struct usb_host_interface *iface_desc; | |
652 | struct usb_endpoint_descriptor *endpoint; | |
653 | int i; | |
654 | int true_size; | |
655 | int retval = -ENOMEM; | |
656 | ||
657 | /* allocate memory for our device state and intialize it */ | |
658 | ||
659 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
660 | if (dev == NULL) { | |
661 | dev_err(&intf->dev, "Out of memory\n"); | |
662 | goto exit; | |
663 | } | |
664 | init_MUTEX(&dev->sem); | |
665 | dev->intf = intf; | |
666 | init_waitqueue_head(&dev->read_wait); | |
667 | init_waitqueue_head(&dev->write_wait); | |
668 | ||
669 | iface_desc = intf->cur_altsetting; | |
670 | ||
671 | /* set up the endpoint information */ | |
672 | for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { | |
673 | endpoint = &iface_desc->endpoint[i].desc; | |
674 | ||
675 | if (usb_endpoint_is_int_in(endpoint)) | |
676 | dev->interrupt_in_endpoint = endpoint; | |
677 | ||
678 | if (usb_endpoint_is_int_out(endpoint)) | |
679 | dev->interrupt_out_endpoint = endpoint; | |
680 | } | |
681 | if (dev->interrupt_in_endpoint == NULL) { | |
682 | dev_err(&intf->dev, "Interrupt in endpoint not found\n"); | |
683 | goto error; | |
684 | } | |
685 | if (dev->interrupt_out_endpoint == NULL) | |
686 | dev_warn(&intf->dev, "Interrupt out endpoint not found (using control endpoint instead)\n"); | |
687 | ||
688 | dev->interrupt_in_endpoint_size = le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize); | |
689 | ||
690 | if (dev->interrupt_in_endpoint_size != 64) | |
691 | dev_warn(&intf->dev, "Interrupt in endpoint size is not 64!\n"); | |
692 | ||
693 | if(ring_buffer_size == 0) { ring_buffer_size = RING_BUFFER_SIZE; } | |
694 | ||
695 | true_size = min(ring_buffer_size,RING_BUFFER_SIZE); | |
696 | ||
697 | /* FIXME - there are more usb_alloc routines for dma correctness. Needed? */ | |
698 | ||
699 | // dev->ring_buffer = kmalloc((true_size*sizeof(struct alphatrack_icmd))+12, GFP_KERNEL); | |
700 | dev->ring_buffer = kmalloc((true_size*sizeof(struct alphatrack_icmd)), GFP_KERNEL); | |
701 | ||
702 | if (!dev->ring_buffer) { | |
703 | dev_err(&intf->dev, "Couldn't allocate input ring_buffer of size %d\n",true_size); | |
704 | goto error; | |
705 | } | |
706 | ||
707 | dev->interrupt_in_buffer = kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL); | |
708 | ||
709 | if (!dev->interrupt_in_buffer) { | |
710 | dev_err(&intf->dev, "Couldn't allocate interrupt_in_buffer\n"); | |
711 | goto error; | |
712 | } | |
713 | dev->oldi_buffer = kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL); | |
714 | if (!dev->oldi_buffer) { | |
715 | dev_err(&intf->dev, "Couldn't allocate old buffer\n"); | |
716 | goto error; | |
717 | } | |
718 | dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL); | |
719 | if (!dev->interrupt_in_urb) { | |
720 | dev_err(&intf->dev, "Couldn't allocate interrupt_in_urb\n"); | |
721 | goto error; | |
722 | } | |
723 | ||
724 | dev->interrupt_out_endpoint_size = dev->interrupt_out_endpoint ? le16_to_cpu(dev->interrupt_out_endpoint->wMaxPacketSize) : | |
725 | udev->descriptor.bMaxPacketSize0; | |
726 | ||
727 | if (dev->interrupt_out_endpoint_size !=64) | |
728 | dev_warn(&intf->dev, "Interrupt out endpoint size is not 64!)\n"); | |
729 | ||
730 | if(write_buffer_size == 0) { write_buffer_size = WRITE_BUFFER_SIZE; } | |
731 | true_size = min(write_buffer_size,WRITE_BUFFER_SIZE); | |
732 | ||
733 | dev->interrupt_out_buffer = kmalloc(true_size*dev->interrupt_out_endpoint_size, GFP_KERNEL); | |
734 | ||
735 | if (!dev->interrupt_out_buffer) { | |
736 | dev_err(&intf->dev, "Couldn't allocate interrupt_out_buffer\n"); | |
737 | goto error; | |
738 | } | |
739 | ||
740 | dev->write_buffer = kmalloc(sizeof(struct alphatrack_ocmd)*true_size, GFP_KERNEL); | |
741 | ||
742 | if (!dev->write_buffer) { | |
743 | dev_err(&intf->dev, "Couldn't allocate write_buffer \n"); | |
744 | goto error; | |
745 | } | |
746 | ||
747 | dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL); | |
748 | if (!dev->interrupt_out_urb) { | |
749 | dev_err(&intf->dev, "Couldn't allocate interrupt_out_urb\n"); | |
750 | goto error; | |
751 | } | |
752 | dev->interrupt_in_interval = min_interrupt_in_interval > dev->interrupt_in_endpoint->bInterval ? min_interrupt_in_interval : dev->interrupt_in_endpoint->bInterval; | |
753 | if (dev->interrupt_out_endpoint) | |
754 | dev->interrupt_out_interval = min_interrupt_out_interval > dev->interrupt_out_endpoint->bInterval ? min_interrupt_out_interval : dev->interrupt_out_endpoint->bInterval; | |
755 | ||
756 | /* we can register the device now, as it is ready */ | |
757 | usb_set_intfdata(intf, dev); | |
758 | ||
759 | atomic_set(&dev->writes_pending,0); | |
760 | retval = usb_register_dev(intf, &usb_alphatrack_class); | |
761 | if (retval) { | |
762 | /* something prevented us from registering this driver */ | |
763 | dev_err(&intf->dev, "Not able to get a minor for this device.\n"); | |
764 | usb_set_intfdata(intf, NULL); | |
765 | goto error; | |
766 | } | |
767 | ||
768 | /* let the user know what node this device is now attached to */ | |
769 | dev_info(&intf->dev, "Alphatrack Device #%d now attached to major %d minor %d\n", | |
770 | (intf->minor - USB_ALPHATRACK_MINOR_BASE), USB_MAJOR, intf->minor); | |
771 | ||
8da3dc28 DT |
772 | exit: |
773 | return retval; | |
774 | ||
775 | error: | |
776 | usb_alphatrack_delete(dev); | |
777 | ||
778 | return retval; | |
779 | } | |
780 | ||
781 | /** | |
782 | * usb_alphatrack_disconnect | |
783 | * | |
784 | * Called by the usb core when the device is removed from the system. | |
785 | */ | |
786 | static void usb_alphatrack_disconnect(struct usb_interface *intf) | |
787 | { | |
788 | struct usb_alphatrack *dev; | |
789 | int minor; | |
790 | ||
791 | mutex_lock(&disconnect_mutex); | |
792 | ||
793 | dev = usb_get_intfdata(intf); | |
794 | usb_set_intfdata(intf, NULL); | |
795 | ||
796 | down(&dev->sem); | |
797 | ||
798 | minor = intf->minor; | |
799 | ||
800 | /* give back our minor */ | |
801 | usb_deregister_dev(intf, &usb_alphatrack_class); | |
802 | ||
803 | /* if the device is not opened, then we clean up right now */ | |
804 | if (!dev->open_count) { | |
805 | up(&dev->sem); | |
806 | usb_alphatrack_delete(dev); | |
807 | } else { | |
808 | dev->intf = NULL; | |
809 | up(&dev->sem); | |
810 | } | |
811 | ||
812 | atomic_set(&dev->writes_pending,0); | |
813 | mutex_unlock(&disconnect_mutex); | |
814 | ||
815 | dev_info(&intf->dev, "Alphatrack Surface #%d now disconnected\n", | |
816 | (minor - USB_ALPHATRACK_MINOR_BASE)); | |
817 | } | |
818 | ||
819 | /* usb specific object needed to register this driver with the usb subsystem */ | |
820 | static struct usb_driver usb_alphatrack_driver = { | |
821 | .name = "alphatrack", | |
822 | .probe = usb_alphatrack_probe, | |
823 | .disconnect = usb_alphatrack_disconnect, | |
824 | .id_table = usb_alphatrack_table, | |
825 | }; | |
826 | ||
827 | /** | |
828 | * usb_alphatrack_init | |
829 | */ | |
830 | static int __init usb_alphatrack_init(void) | |
831 | { | |
832 | int retval; | |
833 | ||
834 | /* register this driver with the USB subsystem */ | |
835 | retval = usb_register(&usb_alphatrack_driver); | |
836 | if (retval) | |
837 | err("usb_register failed for the "__FILE__" driver. Error number %d\n", retval); | |
838 | ||
839 | return retval; | |
840 | } | |
841 | ||
842 | /** | |
843 | * usb_alphatrack_exit | |
844 | */ | |
845 | static void __exit usb_alphatrack_exit(void) | |
846 | { | |
847 | /* deregister this driver with the USB subsystem */ | |
848 | usb_deregister(&usb_alphatrack_driver); | |
849 | } | |
850 | ||
851 | module_init(usb_alphatrack_init); | |
852 | module_exit(usb_alphatrack_exit); | |
853 |