Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * LEGO USB Tower driver | |
3 | * | |
4 | * Copyright (C) 2003 David Glance <davidgsf@sourceforge.net> | |
5 | * 2001-2004 Juergen Stuber <starblue@users.sourceforge.net> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License as | |
9 | * published by the Free Software Foundation; either version 2 of | |
10 | * the License, or (at your option) any later version. | |
11 | * | |
12 | * derived from USB Skeleton driver - 0.5 | |
13 | * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com) | |
14 | * | |
15 | * History: | |
16 | * | |
17 | * 2001-10-13 - 0.1 js | |
18 | * - first version | |
19 | * 2001-11-03 - 0.2 js | |
20 | * - simplified buffering, one-shot URBs for writing | |
21 | * 2001-11-10 - 0.3 js | |
22 | * - removed IOCTL (setting power/mode is more complicated, postponed) | |
23 | * 2001-11-28 - 0.4 js | |
24 | * - added vendor commands for mode of operation and power level in open | |
25 | * 2001-12-04 - 0.5 js | |
26 | * - set IR mode by default (by oversight 0.4 set VLL mode) | |
27 | * 2002-01-11 - 0.5? pcchan | |
28 | * - make read buffer reusable and work around bytes_to_write issue between | |
29 | * uhci and legusbtower | |
30 | * 2002-09-23 - 0.52 david (david@csse.uwa.edu.au) | |
31 | * - imported into lejos project | |
32 | * - changed wake_up to wake_up_interruptible | |
33 | * - changed to use lego0 rather than tower0 | |
441b62c1 | 34 | * - changed dbg() to use __func__ rather than deprecated __func__ |
1da177e4 LT |
35 | * 2003-01-12 - 0.53 david (david@csse.uwa.edu.au) |
36 | * - changed read and write to write everything or | |
37 | * timeout (from a patch by Chris Riesen and Brett Thaeler driver) | |
38 | * - added ioctl functionality to set timeouts | |
39 | * 2003-07-18 - 0.54 davidgsf (david@csse.uwa.edu.au) | |
40 | * - initial import into LegoUSB project | |
41 | * - merge of existing LegoUSB.c driver | |
42 | * 2003-07-18 - 0.56 davidgsf (david@csse.uwa.edu.au) | |
43 | * - port to 2.6 style driver | |
44 | * 2004-02-29 - 0.6 Juergen Stuber <starblue@users.sourceforge.net> | |
45 | * - fix locking | |
46 | * - unlink read URBs which are no longer needed | |
47 | * - allow increased buffer size, eliminates need for timeout on write | |
48 | * - have read URB running continuously | |
49 | * - added poll | |
50 | * - forbid seeking | |
51 | * - added nonblocking I/O | |
441b62c1 | 52 | * - changed back __func__ to __func__ |
1da177e4 LT |
53 | * - read and log tower firmware version |
54 | * - reset tower on probe, avoids failure of first write | |
55 | * 2004-03-09 - 0.7 Juergen Stuber <starblue@users.sourceforge.net> | |
56 | * - timeout read now only after inactivity, shorten default accordingly | |
57 | * 2004-03-11 - 0.8 Juergen Stuber <starblue@users.sourceforge.net> | |
58 | * - log major, minor instead of possibly confusing device filename | |
59 | * - whitespace cleanup | |
60 | * 2004-03-12 - 0.9 Juergen Stuber <starblue@users.sourceforge.net> | |
61 | * - normalize whitespace in debug messages | |
62 | * - take care about endianness in control message responses | |
63 | * 2004-03-13 - 0.91 Juergen Stuber <starblue@users.sourceforge.net> | |
64 | * - make default intervals longer to accommodate current EHCI driver | |
65 | * 2004-03-19 - 0.92 Juergen Stuber <starblue@users.sourceforge.net> | |
66 | * - replaced atomic_t by memory barriers | |
67 | * 2004-04-21 - 0.93 Juergen Stuber <starblue@users.sourceforge.net> | |
68 | * - wait for completion of write urb in release (needed for remotecontrol) | |
69 | * - corrected poll for write direction (missing negation) | |
70 | * 2004-04-22 - 0.94 Juergen Stuber <starblue@users.sourceforge.net> | |
71 | * - make device locking interruptible | |
72 | * 2004-04-30 - 0.95 Juergen Stuber <starblue@users.sourceforge.net> | |
73 | * - check for valid udev on resubmitting and unlinking urbs | |
74 | * 2004-08-03 - 0.96 Juergen Stuber <starblue@users.sourceforge.net> | |
75 | * - move reset into open to clean out spurious data | |
76 | */ | |
77 | ||
1da177e4 LT |
78 | #include <linux/kernel.h> |
79 | #include <linux/errno.h> | |
80 | #include <linux/init.h> | |
81 | #include <linux/slab.h> | |
82 | #include <linux/module.h> | |
1da177e4 | 83 | #include <linux/completion.h> |
4186ecf8 | 84 | #include <linux/mutex.h> |
1da177e4 LT |
85 | #include <asm/uaccess.h> |
86 | #include <linux/usb.h> | |
87 | #include <linux/poll.h> | |
88 | ||
89 | ||
90 | #ifdef CONFIG_USB_DEBUG | |
91 | static int debug = 4; | |
92 | #else | |
93 | static int debug = 0; | |
94 | #endif | |
95 | ||
96 | /* Use our own dbg macro */ | |
97 | #undef dbg | |
f45ba776 JP |
98 | #define dbg(lvl, format, arg...) \ |
99 | do { \ | |
100 | if (debug >= lvl) \ | |
101 | printk(KERN_DEBUG "%s: " format "\n", __FILE__, ##arg); \ | |
102 | } while (0) | |
1da177e4 LT |
103 | |
104 | /* Version Information */ | |
105 | #define DRIVER_VERSION "v0.96" | |
106 | #define DRIVER_AUTHOR "Juergen Stuber <starblue@sourceforge.net>" | |
107 | #define DRIVER_DESC "LEGO USB Tower Driver" | |
108 | ||
109 | /* Module parameters */ | |
110 | module_param(debug, int, S_IRUGO | S_IWUSR); | |
111 | MODULE_PARM_DESC(debug, "Debug enabled or not"); | |
112 | ||
113 | /* The defaults are chosen to work with the latest versions of leJOS and NQC. | |
114 | */ | |
115 | ||
116 | /* Some legacy software likes to receive packets in one piece. | |
117 | * In this case read_buffer_size should exceed the maximal packet length | |
118 | * (417 for datalog uploads), and packet_timeout should be set. | |
119 | */ | |
120 | static int read_buffer_size = 480; | |
121 | module_param(read_buffer_size, int, 0); | |
122 | MODULE_PARM_DESC(read_buffer_size, "Read buffer size"); | |
123 | ||
124 | /* Some legacy software likes to send packets in one piece. | |
125 | * In this case write_buffer_size should exceed the maximal packet length | |
126 | * (417 for firmware and program downloads). | |
127 | * A problem with long writes is that the following read may time out | |
128 | * if the software is not prepared to wait long enough. | |
129 | */ | |
130 | static int write_buffer_size = 480; | |
131 | module_param(write_buffer_size, int, 0); | |
132 | MODULE_PARM_DESC(write_buffer_size, "Write buffer size"); | |
133 | ||
134 | /* Some legacy software expects reads to contain whole LASM packets. | |
135 | * To achieve this, characters which arrive before a packet timeout | |
136 | * occurs will be returned in a single read operation. | |
137 | * A problem with long reads is that the software may time out | |
138 | * if it is not prepared to wait long enough. | |
139 | * The packet timeout should be greater than the time between the | |
140 | * reception of subsequent characters, which should arrive about | |
141 | * every 5ms for the standard 2400 baud. | |
142 | * Set it to 0 to disable. | |
143 | */ | |
144 | static int packet_timeout = 50; | |
145 | module_param(packet_timeout, int, 0); | |
146 | MODULE_PARM_DESC(packet_timeout, "Packet timeout in ms"); | |
147 | ||
148 | /* Some legacy software expects blocking reads to time out. | |
149 | * Timeout occurs after the specified time of read and write inactivity. | |
150 | * Set it to 0 to disable. | |
151 | */ | |
152 | static int read_timeout = 200; | |
153 | module_param(read_timeout, int, 0); | |
154 | MODULE_PARM_DESC(read_timeout, "Read timeout in ms"); | |
155 | ||
156 | /* As of kernel version 2.6.4 ehci-hcd uses an | |
157 | * "only one interrupt transfer per frame" shortcut | |
158 | * to simplify the scheduling of periodic transfers. | |
159 | * This conflicts with our standard 1ms intervals for in and out URBs. | |
160 | * We use default intervals of 2ms for in and 8ms for out transfers, | |
161 | * which is fast enough for 2400 baud and allows a small additional load. | |
162 | * Increase the interval to allow more devices that do interrupt transfers, | |
163 | * or set to 0 to use the standard interval from the endpoint descriptors. | |
164 | */ | |
165 | static int interrupt_in_interval = 2; | |
166 | module_param(interrupt_in_interval, int, 0); | |
167 | MODULE_PARM_DESC(interrupt_in_interval, "Interrupt in interval in ms"); | |
168 | ||
169 | static int interrupt_out_interval = 8; | |
170 | module_param(interrupt_out_interval, int, 0); | |
171 | MODULE_PARM_DESC(interrupt_out_interval, "Interrupt out interval in ms"); | |
172 | ||
173 | /* Define these values to match your device */ | |
174 | #define LEGO_USB_TOWER_VENDOR_ID 0x0694 | |
175 | #define LEGO_USB_TOWER_PRODUCT_ID 0x0001 | |
176 | ||
177 | /* Vendor requests */ | |
178 | #define LEGO_USB_TOWER_REQUEST_RESET 0x04 | |
179 | #define LEGO_USB_TOWER_REQUEST_GET_VERSION 0xFD | |
180 | ||
181 | struct tower_reset_reply { | |
182 | __le16 size; /* little-endian */ | |
183 | __u8 err_code; | |
184 | __u8 spare; | |
185 | } __attribute__ ((packed)); | |
186 | ||
187 | struct tower_get_version_reply { | |
188 | __le16 size; /* little-endian */ | |
189 | __u8 err_code; | |
190 | __u8 spare; | |
191 | __u8 major; | |
192 | __u8 minor; | |
193 | __le16 build_no; /* little-endian */ | |
194 | } __attribute__ ((packed)); | |
195 | ||
196 | ||
197 | /* table of devices that work with this driver */ | |
33b9e162 | 198 | static const struct usb_device_id tower_table[] = { |
1da177e4 LT |
199 | { USB_DEVICE(LEGO_USB_TOWER_VENDOR_ID, LEGO_USB_TOWER_PRODUCT_ID) }, |
200 | { } /* Terminating entry */ | |
201 | }; | |
202 | ||
203 | MODULE_DEVICE_TABLE (usb, tower_table); | |
78663ecc | 204 | static DEFINE_MUTEX(open_disc_mutex); |
1da177e4 LT |
205 | |
206 | #define LEGO_USB_TOWER_MINOR_BASE 160 | |
207 | ||
208 | ||
209 | /* Structure to hold all of our device specific stuff */ | |
210 | struct lego_usb_tower { | |
18bcbcfe | 211 | struct mutex lock; /* locks this structure */ |
1da177e4 LT |
212 | struct usb_device* udev; /* save off the usb device pointer */ |
213 | unsigned char minor; /* the starting minor number for this device */ | |
214 | ||
215 | int open_count; /* number of times this port has been opened */ | |
216 | ||
217 | char* read_buffer; | |
218 | size_t read_buffer_length; /* this much came in */ | |
219 | size_t read_packet_length; /* this much will be returned on read */ | |
220 | spinlock_t read_buffer_lock; | |
221 | int packet_timeout_jiffies; | |
222 | unsigned long read_last_arrival; | |
223 | ||
224 | wait_queue_head_t read_wait; | |
225 | wait_queue_head_t write_wait; | |
226 | ||
227 | char* interrupt_in_buffer; | |
228 | struct usb_endpoint_descriptor* interrupt_in_endpoint; | |
229 | struct urb* interrupt_in_urb; | |
230 | int interrupt_in_interval; | |
231 | int interrupt_in_running; | |
232 | int interrupt_in_done; | |
233 | ||
234 | char* interrupt_out_buffer; | |
235 | struct usb_endpoint_descriptor* interrupt_out_endpoint; | |
236 | struct urb* interrupt_out_urb; | |
237 | int interrupt_out_interval; | |
238 | int interrupt_out_busy; | |
239 | ||
240 | }; | |
241 | ||
242 | ||
243 | /* local function prototypes */ | |
244 | static ssize_t tower_read (struct file *file, char __user *buffer, size_t count, loff_t *ppos); | |
245 | static ssize_t tower_write (struct file *file, const char __user *buffer, size_t count, loff_t *ppos); | |
246 | static inline void tower_delete (struct lego_usb_tower *dev); | |
247 | static int tower_open (struct inode *inode, struct file *file); | |
248 | static int tower_release (struct inode *inode, struct file *file); | |
249 | static unsigned int tower_poll (struct file *file, poll_table *wait); | |
250 | static loff_t tower_llseek (struct file *file, loff_t off, int whence); | |
251 | ||
252 | static void tower_abort_transfers (struct lego_usb_tower *dev); | |
253 | static void tower_check_for_read_packet (struct lego_usb_tower *dev); | |
7d12e780 DH |
254 | static void tower_interrupt_in_callback (struct urb *urb); |
255 | static void tower_interrupt_out_callback (struct urb *urb); | |
1da177e4 LT |
256 | |
257 | static int tower_probe (struct usb_interface *interface, const struct usb_device_id *id); | |
258 | static void tower_disconnect (struct usb_interface *interface); | |
259 | ||
260 | ||
1da177e4 | 261 | /* file operations needed when we register this driver */ |
066202dd | 262 | static const struct file_operations tower_fops = { |
1da177e4 LT |
263 | .owner = THIS_MODULE, |
264 | .read = tower_read, | |
265 | .write = tower_write, | |
266 | .open = tower_open, | |
267 | .release = tower_release, | |
268 | .poll = tower_poll, | |
269 | .llseek = tower_llseek, | |
270 | }; | |
271 | ||
e454cea2 | 272 | static char *legousbtower_devnode(struct device *dev, mode_t *mode) |
f7a386c5 KS |
273 | { |
274 | return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev)); | |
275 | } | |
276 | ||
1da177e4 LT |
277 | /* |
278 | * usb class driver info in order to get a minor number from the usb core, | |
d6e5bcf4 | 279 | * and to have the device registered with the driver core |
1da177e4 LT |
280 | */ |
281 | static struct usb_class_driver tower_class = { | |
d6e5bcf4 | 282 | .name = "legousbtower%d", |
e454cea2 | 283 | .devnode = legousbtower_devnode, |
1da177e4 | 284 | .fops = &tower_fops, |
1da177e4 LT |
285 | .minor_base = LEGO_USB_TOWER_MINOR_BASE, |
286 | }; | |
287 | ||
288 | ||
289 | /* usb specific object needed to register this driver with the usb subsystem */ | |
290 | static struct usb_driver tower_driver = { | |
1da177e4 LT |
291 | .name = "legousbtower", |
292 | .probe = tower_probe, | |
293 | .disconnect = tower_disconnect, | |
294 | .id_table = tower_table, | |
295 | }; | |
296 | ||
297 | ||
298 | /** | |
299 | * lego_usb_tower_debug_data | |
300 | */ | |
301 | static inline void lego_usb_tower_debug_data (int level, const char *function, int size, const unsigned char *data) | |
302 | { | |
303 | int i; | |
304 | ||
305 | if (debug < level) | |
306 | return; | |
307 | ||
f45ba776 | 308 | printk (KERN_DEBUG "%s: %s - length = %d, data = ", __FILE__, function, size); |
1da177e4 LT |
309 | for (i = 0; i < size; ++i) { |
310 | printk ("%.2x ", data[i]); | |
311 | } | |
312 | printk ("\n"); | |
313 | } | |
314 | ||
315 | ||
316 | /** | |
317 | * tower_delete | |
318 | */ | |
319 | static inline void tower_delete (struct lego_usb_tower *dev) | |
320 | { | |
441b62c1 | 321 | dbg(2, "%s: enter", __func__); |
1da177e4 LT |
322 | |
323 | tower_abort_transfers (dev); | |
324 | ||
325 | /* free data structures */ | |
f53510e8 MK |
326 | usb_free_urb(dev->interrupt_in_urb); |
327 | usb_free_urb(dev->interrupt_out_urb); | |
1da177e4 LT |
328 | kfree (dev->read_buffer); |
329 | kfree (dev->interrupt_in_buffer); | |
330 | kfree (dev->interrupt_out_buffer); | |
331 | kfree (dev); | |
332 | ||
441b62c1 | 333 | dbg(2, "%s: leave", __func__); |
1da177e4 LT |
334 | } |
335 | ||
336 | ||
337 | /** | |
338 | * tower_open | |
339 | */ | |
340 | static int tower_open (struct inode *inode, struct file *file) | |
341 | { | |
342 | struct lego_usb_tower *dev = NULL; | |
343 | int subminor; | |
344 | int retval = 0; | |
345 | struct usb_interface *interface; | |
346 | struct tower_reset_reply reset_reply; | |
347 | int result; | |
348 | ||
441b62c1 | 349 | dbg(2, "%s: enter", __func__); |
1da177e4 LT |
350 | |
351 | nonseekable_open(inode, file); | |
352 | subminor = iminor(inode); | |
353 | ||
1da177e4 LT |
354 | interface = usb_find_interface (&tower_driver, subminor); |
355 | ||
356 | if (!interface) { | |
357 | err ("%s - error, can't find device for minor %d", | |
441b62c1 | 358 | __func__, subminor); |
1da177e4 | 359 | retval = -ENODEV; |
d4ead16f | 360 | goto exit; |
1da177e4 LT |
361 | } |
362 | ||
78663ecc | 363 | mutex_lock(&open_disc_mutex); |
1da177e4 LT |
364 | dev = usb_get_intfdata(interface); |
365 | ||
366 | if (!dev) { | |
78663ecc | 367 | mutex_unlock(&open_disc_mutex); |
1da177e4 | 368 | retval = -ENODEV; |
d4ead16f | 369 | goto exit; |
1da177e4 LT |
370 | } |
371 | ||
372 | /* lock this device */ | |
18bcbcfe | 373 | if (mutex_lock_interruptible(&dev->lock)) { |
78663ecc | 374 | mutex_unlock(&open_disc_mutex); |
1da177e4 | 375 | retval = -ERESTARTSYS; |
d4ead16f | 376 | goto exit; |
1da177e4 LT |
377 | } |
378 | ||
78663ecc | 379 | |
1da177e4 LT |
380 | /* allow opening only once */ |
381 | if (dev->open_count) { | |
78663ecc | 382 | mutex_unlock(&open_disc_mutex); |
1da177e4 LT |
383 | retval = -EBUSY; |
384 | goto unlock_exit; | |
385 | } | |
386 | dev->open_count = 1; | |
78663ecc | 387 | mutex_unlock(&open_disc_mutex); |
1da177e4 LT |
388 | |
389 | /* reset the tower */ | |
390 | result = usb_control_msg (dev->udev, | |
391 | usb_rcvctrlpipe(dev->udev, 0), | |
392 | LEGO_USB_TOWER_REQUEST_RESET, | |
393 | USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE, | |
394 | 0, | |
395 | 0, | |
396 | &reset_reply, | |
397 | sizeof(reset_reply), | |
398 | 1000); | |
399 | if (result < 0) { | |
400 | err("LEGO USB Tower reset control request failed"); | |
401 | retval = result; | |
402 | goto unlock_exit; | |
403 | } | |
404 | ||
405 | /* initialize in direction */ | |
406 | dev->read_buffer_length = 0; | |
407 | dev->read_packet_length = 0; | |
408 | usb_fill_int_urb (dev->interrupt_in_urb, | |
409 | dev->udev, | |
410 | usb_rcvintpipe(dev->udev, dev->interrupt_in_endpoint->bEndpointAddress), | |
411 | dev->interrupt_in_buffer, | |
29cc8897 | 412 | usb_endpoint_maxp(dev->interrupt_in_endpoint), |
1da177e4 LT |
413 | tower_interrupt_in_callback, |
414 | dev, | |
415 | dev->interrupt_in_interval); | |
416 | ||
417 | dev->interrupt_in_running = 1; | |
418 | dev->interrupt_in_done = 0; | |
419 | mb(); | |
420 | ||
421 | retval = usb_submit_urb (dev->interrupt_in_urb, GFP_KERNEL); | |
422 | if (retval) { | |
423 | err("Couldn't submit interrupt_in_urb %d", retval); | |
424 | dev->interrupt_in_running = 0; | |
425 | dev->open_count = 0; | |
426 | goto unlock_exit; | |
427 | } | |
428 | ||
429 | /* save device in the file's private structure */ | |
430 | file->private_data = dev; | |
431 | ||
432 | unlock_exit: | |
18bcbcfe | 433 | mutex_unlock(&dev->lock); |
1da177e4 | 434 | |
d4ead16f | 435 | exit: |
441b62c1 | 436 | dbg(2, "%s: leave, return value %d ", __func__, retval); |
1da177e4 LT |
437 | |
438 | return retval; | |
439 | } | |
440 | ||
441 | /** | |
442 | * tower_release | |
443 | */ | |
444 | static int tower_release (struct inode *inode, struct file *file) | |
445 | { | |
446 | struct lego_usb_tower *dev; | |
447 | int retval = 0; | |
448 | ||
441b62c1 | 449 | dbg(2, "%s: enter", __func__); |
1da177e4 | 450 | |
5bd6e8b3 | 451 | dev = file->private_data; |
1da177e4 LT |
452 | |
453 | if (dev == NULL) { | |
441b62c1 | 454 | dbg(1, "%s: object is NULL", __func__); |
1da177e4 | 455 | retval = -ENODEV; |
78663ecc | 456 | goto exit_nolock; |
1da177e4 LT |
457 | } |
458 | ||
78663ecc | 459 | mutex_lock(&open_disc_mutex); |
18bcbcfe | 460 | if (mutex_lock_interruptible(&dev->lock)) { |
1da177e4 LT |
461 | retval = -ERESTARTSYS; |
462 | goto exit; | |
463 | } | |
464 | ||
465 | if (dev->open_count != 1) { | |
441b62c1 | 466 | dbg(1, "%s: device not opened exactly once", __func__); |
1da177e4 LT |
467 | retval = -ENODEV; |
468 | goto unlock_exit; | |
469 | } | |
470 | if (dev->udev == NULL) { | |
471 | /* the device was unplugged before the file was released */ | |
18bcbcfe DW |
472 | |
473 | /* unlock here as tower_delete frees dev */ | |
474 | mutex_unlock(&dev->lock); | |
1da177e4 LT |
475 | tower_delete (dev); |
476 | goto exit; | |
477 | } | |
478 | ||
479 | /* wait until write transfer is finished */ | |
480 | if (dev->interrupt_out_busy) { | |
481 | wait_event_interruptible_timeout (dev->write_wait, !dev->interrupt_out_busy, 2 * HZ); | |
482 | } | |
483 | tower_abort_transfers (dev); | |
484 | dev->open_count = 0; | |
485 | ||
486 | unlock_exit: | |
18bcbcfe | 487 | mutex_unlock(&dev->lock); |
1da177e4 LT |
488 | |
489 | exit: | |
78663ecc ON |
490 | mutex_unlock(&open_disc_mutex); |
491 | exit_nolock: | |
441b62c1 | 492 | dbg(2, "%s: leave, return value %d", __func__, retval); |
1da177e4 LT |
493 | return retval; |
494 | } | |
495 | ||
496 | ||
497 | /** | |
498 | * tower_abort_transfers | |
499 | * aborts transfers and frees associated data structures | |
500 | */ | |
501 | static void tower_abort_transfers (struct lego_usb_tower *dev) | |
502 | { | |
441b62c1 | 503 | dbg(2, "%s: enter", __func__); |
1da177e4 LT |
504 | |
505 | if (dev == NULL) { | |
441b62c1 | 506 | dbg(1, "%s: dev is null", __func__); |
1da177e4 LT |
507 | goto exit; |
508 | } | |
509 | ||
510 | /* shutdown transfer */ | |
511 | if (dev->interrupt_in_running) { | |
512 | dev->interrupt_in_running = 0; | |
513 | mb(); | |
f53510e8 | 514 | if (dev->udev) |
1da177e4 | 515 | usb_kill_urb (dev->interrupt_in_urb); |
1da177e4 | 516 | } |
f53510e8 MK |
517 | if (dev->interrupt_out_busy && dev->udev) |
518 | usb_kill_urb(dev->interrupt_out_urb); | |
1da177e4 LT |
519 | |
520 | exit: | |
441b62c1 | 521 | dbg(2, "%s: leave", __func__); |
1da177e4 LT |
522 | } |
523 | ||
524 | ||
525 | /** | |
526 | * tower_check_for_read_packet | |
527 | * | |
528 | * To get correct semantics for signals and non-blocking I/O | |
529 | * with packetizing we pretend not to see any data in the read buffer | |
530 | * until it has been there unchanged for at least | |
531 | * dev->packet_timeout_jiffies, or until the buffer is full. | |
532 | */ | |
533 | static void tower_check_for_read_packet (struct lego_usb_tower *dev) | |
534 | { | |
535 | spin_lock_irq (&dev->read_buffer_lock); | |
536 | if (!packet_timeout | |
537 | || time_after(jiffies, dev->read_last_arrival + dev->packet_timeout_jiffies) | |
538 | || dev->read_buffer_length == read_buffer_size) { | |
539 | dev->read_packet_length = dev->read_buffer_length; | |
540 | } | |
541 | dev->interrupt_in_done = 0; | |
542 | spin_unlock_irq (&dev->read_buffer_lock); | |
543 | } | |
544 | ||
545 | ||
546 | /** | |
547 | * tower_poll | |
548 | */ | |
549 | static unsigned int tower_poll (struct file *file, poll_table *wait) | |
550 | { | |
551 | struct lego_usb_tower *dev; | |
552 | unsigned int mask = 0; | |
553 | ||
441b62c1 | 554 | dbg(2, "%s: enter", __func__); |
1da177e4 LT |
555 | |
556 | dev = file->private_data; | |
557 | ||
d35b4ce1 ON |
558 | if (!dev->udev) |
559 | return POLLERR | POLLHUP; | |
560 | ||
1da177e4 LT |
561 | poll_wait(file, &dev->read_wait, wait); |
562 | poll_wait(file, &dev->write_wait, wait); | |
563 | ||
564 | tower_check_for_read_packet(dev); | |
565 | if (dev->read_packet_length > 0) { | |
566 | mask |= POLLIN | POLLRDNORM; | |
567 | } | |
568 | if (!dev->interrupt_out_busy) { | |
569 | mask |= POLLOUT | POLLWRNORM; | |
570 | } | |
571 | ||
441b62c1 | 572 | dbg(2, "%s: leave, mask = %d", __func__, mask); |
1da177e4 LT |
573 | |
574 | return mask; | |
575 | } | |
576 | ||
577 | ||
578 | /** | |
579 | * tower_llseek | |
580 | */ | |
581 | static loff_t tower_llseek (struct file *file, loff_t off, int whence) | |
582 | { | |
583 | return -ESPIPE; /* unseekable */ | |
584 | } | |
585 | ||
586 | ||
587 | /** | |
588 | * tower_read | |
589 | */ | |
590 | static ssize_t tower_read (struct file *file, char __user *buffer, size_t count, loff_t *ppos) | |
591 | { | |
592 | struct lego_usb_tower *dev; | |
593 | size_t bytes_to_read; | |
594 | int i; | |
595 | int retval = 0; | |
596 | unsigned long timeout = 0; | |
597 | ||
441b62c1 | 598 | dbg(2, "%s: enter, count = %Zd", __func__, count); |
1da177e4 | 599 | |
5bd6e8b3 | 600 | dev = file->private_data; |
1da177e4 LT |
601 | |
602 | /* lock this object */ | |
18bcbcfe | 603 | if (mutex_lock_interruptible(&dev->lock)) { |
1da177e4 LT |
604 | retval = -ERESTARTSYS; |
605 | goto exit; | |
606 | } | |
607 | ||
608 | /* verify that the device wasn't unplugged */ | |
609 | if (dev->udev == NULL) { | |
610 | retval = -ENODEV; | |
611 | err("No device or device unplugged %d", retval); | |
612 | goto unlock_exit; | |
613 | } | |
614 | ||
615 | /* verify that we actually have some data to read */ | |
616 | if (count == 0) { | |
441b62c1 | 617 | dbg(1, "%s: read request of 0 bytes", __func__); |
1da177e4 LT |
618 | goto unlock_exit; |
619 | } | |
620 | ||
621 | if (read_timeout) { | |
622 | timeout = jiffies + read_timeout * HZ / 1000; | |
623 | } | |
624 | ||
625 | /* wait for data */ | |
626 | tower_check_for_read_packet (dev); | |
627 | while (dev->read_packet_length == 0) { | |
628 | if (file->f_flags & O_NONBLOCK) { | |
629 | retval = -EAGAIN; | |
630 | goto unlock_exit; | |
631 | } | |
632 | retval = wait_event_interruptible_timeout(dev->read_wait, dev->interrupt_in_done, dev->packet_timeout_jiffies); | |
633 | if (retval < 0) { | |
634 | goto unlock_exit; | |
635 | } | |
636 | ||
637 | /* reset read timeout during read or write activity */ | |
638 | if (read_timeout | |
639 | && (dev->read_buffer_length || dev->interrupt_out_busy)) { | |
640 | timeout = jiffies + read_timeout * HZ / 1000; | |
641 | } | |
642 | /* check for read timeout */ | |
643 | if (read_timeout && time_after (jiffies, timeout)) { | |
644 | retval = -ETIMEDOUT; | |
645 | goto unlock_exit; | |
646 | } | |
647 | tower_check_for_read_packet (dev); | |
648 | } | |
649 | ||
650 | /* copy the data from read_buffer into userspace */ | |
651 | bytes_to_read = min(count, dev->read_packet_length); | |
652 | ||
653 | if (copy_to_user (buffer, dev->read_buffer, bytes_to_read)) { | |
654 | retval = -EFAULT; | |
655 | goto unlock_exit; | |
656 | } | |
657 | ||
658 | spin_lock_irq (&dev->read_buffer_lock); | |
659 | dev->read_buffer_length -= bytes_to_read; | |
660 | dev->read_packet_length -= bytes_to_read; | |
661 | for (i=0; i<dev->read_buffer_length; i++) { | |
662 | dev->read_buffer[i] = dev->read_buffer[i+bytes_to_read]; | |
663 | } | |
664 | spin_unlock_irq (&dev->read_buffer_lock); | |
665 | ||
666 | retval = bytes_to_read; | |
667 | ||
668 | unlock_exit: | |
669 | /* unlock the device */ | |
18bcbcfe | 670 | mutex_unlock(&dev->lock); |
1da177e4 LT |
671 | |
672 | exit: | |
441b62c1 | 673 | dbg(2, "%s: leave, return value %d", __func__, retval); |
1da177e4 LT |
674 | return retval; |
675 | } | |
676 | ||
677 | ||
678 | /** | |
679 | * tower_write | |
680 | */ | |
681 | static ssize_t tower_write (struct file *file, const char __user *buffer, size_t count, loff_t *ppos) | |
682 | { | |
683 | struct lego_usb_tower *dev; | |
684 | size_t bytes_to_write; | |
685 | int retval = 0; | |
686 | ||
441b62c1 | 687 | dbg(2, "%s: enter, count = %Zd", __func__, count); |
1da177e4 | 688 | |
5bd6e8b3 | 689 | dev = file->private_data; |
1da177e4 LT |
690 | |
691 | /* lock this object */ | |
18bcbcfe | 692 | if (mutex_lock_interruptible(&dev->lock)) { |
1da177e4 LT |
693 | retval = -ERESTARTSYS; |
694 | goto exit; | |
695 | } | |
696 | ||
697 | /* verify that the device wasn't unplugged */ | |
698 | if (dev->udev == NULL) { | |
699 | retval = -ENODEV; | |
700 | err("No device or device unplugged %d", retval); | |
701 | goto unlock_exit; | |
702 | } | |
703 | ||
704 | /* verify that we actually have some data to write */ | |
705 | if (count == 0) { | |
441b62c1 | 706 | dbg(1, "%s: write request of 0 bytes", __func__); |
1da177e4 LT |
707 | goto unlock_exit; |
708 | } | |
709 | ||
710 | /* wait until previous transfer is finished */ | |
711 | while (dev->interrupt_out_busy) { | |
712 | if (file->f_flags & O_NONBLOCK) { | |
713 | retval = -EAGAIN; | |
714 | goto unlock_exit; | |
715 | } | |
716 | retval = wait_event_interruptible (dev->write_wait, !dev->interrupt_out_busy); | |
717 | if (retval) { | |
718 | goto unlock_exit; | |
719 | } | |
720 | } | |
721 | ||
722 | /* write the data into interrupt_out_buffer from userspace */ | |
723 | bytes_to_write = min_t(int, count, write_buffer_size); | |
441b62c1 | 724 | dbg(4, "%s: count = %Zd, bytes_to_write = %Zd", __func__, count, bytes_to_write); |
1da177e4 LT |
725 | |
726 | if (copy_from_user (dev->interrupt_out_buffer, buffer, bytes_to_write)) { | |
727 | retval = -EFAULT; | |
728 | goto unlock_exit; | |
729 | } | |
730 | ||
731 | /* send off the urb */ | |
732 | usb_fill_int_urb(dev->interrupt_out_urb, | |
733 | dev->udev, | |
734 | usb_sndintpipe(dev->udev, dev->interrupt_out_endpoint->bEndpointAddress), | |
735 | dev->interrupt_out_buffer, | |
736 | bytes_to_write, | |
737 | tower_interrupt_out_callback, | |
738 | dev, | |
739 | dev->interrupt_out_interval); | |
740 | ||
741 | dev->interrupt_out_busy = 1; | |
742 | wmb(); | |
743 | ||
744 | retval = usb_submit_urb (dev->interrupt_out_urb, GFP_KERNEL); | |
745 | if (retval) { | |
746 | dev->interrupt_out_busy = 0; | |
747 | err("Couldn't submit interrupt_out_urb %d", retval); | |
748 | goto unlock_exit; | |
749 | } | |
750 | retval = bytes_to_write; | |
751 | ||
752 | unlock_exit: | |
753 | /* unlock the device */ | |
18bcbcfe | 754 | mutex_unlock(&dev->lock); |
1da177e4 LT |
755 | |
756 | exit: | |
441b62c1 | 757 | dbg(2, "%s: leave, return value %d", __func__, retval); |
1da177e4 LT |
758 | |
759 | return retval; | |
760 | } | |
761 | ||
762 | ||
763 | /** | |
764 | * tower_interrupt_in_callback | |
765 | */ | |
7d12e780 | 766 | static void tower_interrupt_in_callback (struct urb *urb) |
1da177e4 | 767 | { |
cdc97792 | 768 | struct lego_usb_tower *dev = urb->context; |
64771a0f | 769 | int status = urb->status; |
1da177e4 LT |
770 | int retval; |
771 | ||
441b62c1 | 772 | dbg(4, "%s: enter, status %d", __func__, status); |
1da177e4 | 773 | |
441b62c1 | 774 | lego_usb_tower_debug_data(5, __func__, urb->actual_length, urb->transfer_buffer); |
1da177e4 | 775 | |
64771a0f GKH |
776 | if (status) { |
777 | if (status == -ENOENT || | |
778 | status == -ECONNRESET || | |
779 | status == -ESHUTDOWN) { | |
1da177e4 LT |
780 | goto exit; |
781 | } else { | |
441b62c1 | 782 | dbg(1, "%s: nonzero status received: %d", __func__, status); |
1da177e4 LT |
783 | goto resubmit; /* maybe we can recover */ |
784 | } | |
785 | } | |
786 | ||
787 | if (urb->actual_length > 0) { | |
788 | spin_lock (&dev->read_buffer_lock); | |
789 | if (dev->read_buffer_length + urb->actual_length < read_buffer_size) { | |
790 | memcpy (dev->read_buffer + dev->read_buffer_length, | |
791 | dev->interrupt_in_buffer, | |
792 | urb->actual_length); | |
793 | dev->read_buffer_length += urb->actual_length; | |
794 | dev->read_last_arrival = jiffies; | |
441b62c1 | 795 | dbg(3, "%s: received %d bytes", __func__, urb->actual_length); |
1da177e4 | 796 | } else { |
441b62c1 | 797 | printk(KERN_WARNING "%s: read_buffer overflow, %d bytes dropped", __func__, urb->actual_length); |
1da177e4 LT |
798 | } |
799 | spin_unlock (&dev->read_buffer_lock); | |
800 | } | |
801 | ||
802 | resubmit: | |
803 | /* resubmit if we're still running */ | |
804 | if (dev->interrupt_in_running && dev->udev) { | |
805 | retval = usb_submit_urb (dev->interrupt_in_urb, GFP_ATOMIC); | |
806 | if (retval) { | |
441b62c1 | 807 | err("%s: usb_submit_urb failed (%d)", __func__, retval); |
1da177e4 LT |
808 | } |
809 | } | |
810 | ||
811 | exit: | |
812 | dev->interrupt_in_done = 1; | |
813 | wake_up_interruptible (&dev->read_wait); | |
814 | ||
441b62c1 HH |
815 | lego_usb_tower_debug_data(5, __func__, urb->actual_length, urb->transfer_buffer); |
816 | dbg(4, "%s: leave, status %d", __func__, status); | |
1da177e4 LT |
817 | } |
818 | ||
819 | ||
820 | /** | |
821 | * tower_interrupt_out_callback | |
822 | */ | |
7d12e780 | 823 | static void tower_interrupt_out_callback (struct urb *urb) |
1da177e4 | 824 | { |
cdc97792 | 825 | struct lego_usb_tower *dev = urb->context; |
64771a0f | 826 | int status = urb->status; |
1da177e4 | 827 | |
441b62c1 HH |
828 | dbg(4, "%s: enter, status %d", __func__, status); |
829 | lego_usb_tower_debug_data(5, __func__, urb->actual_length, urb->transfer_buffer); | |
1da177e4 LT |
830 | |
831 | /* sync/async unlink faults aren't errors */ | |
64771a0f GKH |
832 | if (status && !(status == -ENOENT || |
833 | status == -ECONNRESET || | |
834 | status == -ESHUTDOWN)) { | |
1da177e4 | 835 | dbg(1, "%s - nonzero write bulk status received: %d", |
441b62c1 | 836 | __func__, status); |
1da177e4 LT |
837 | } |
838 | ||
839 | dev->interrupt_out_busy = 0; | |
840 | wake_up_interruptible(&dev->write_wait); | |
841 | ||
441b62c1 HH |
842 | lego_usb_tower_debug_data(5, __func__, urb->actual_length, urb->transfer_buffer); |
843 | dbg(4, "%s: leave, status %d", __func__, status); | |
1da177e4 LT |
844 | } |
845 | ||
846 | ||
847 | /** | |
848 | * tower_probe | |
849 | * | |
850 | * Called by the usb core when a new device is connected that it thinks | |
851 | * this driver might be interested in. | |
852 | */ | |
853 | static int tower_probe (struct usb_interface *interface, const struct usb_device_id *id) | |
854 | { | |
855 | struct usb_device *udev = interface_to_usbdev(interface); | |
856 | struct lego_usb_tower *dev = NULL; | |
857 | struct usb_host_interface *iface_desc; | |
858 | struct usb_endpoint_descriptor* endpoint; | |
859 | struct tower_get_version_reply get_version_reply; | |
860 | int i; | |
861 | int retval = -ENOMEM; | |
862 | int result; | |
863 | ||
441b62c1 | 864 | dbg(2, "%s: enter", __func__); |
1da177e4 | 865 | |
1b29a375 GKH |
866 | if (udev == NULL) |
867 | dev_info(&interface->dev, "udev is NULL.\n"); | |
1da177e4 | 868 | |
093cf723 | 869 | /* allocate memory for our device state and initialize it */ |
1da177e4 LT |
870 | |
871 | dev = kmalloc (sizeof(struct lego_usb_tower), GFP_KERNEL); | |
872 | ||
873 | if (dev == NULL) { | |
874 | err ("Out of memory"); | |
875 | goto exit; | |
876 | } | |
877 | ||
18bcbcfe | 878 | mutex_init(&dev->lock); |
1da177e4 LT |
879 | |
880 | dev->udev = udev; | |
881 | dev->open_count = 0; | |
882 | ||
883 | dev->read_buffer = NULL; | |
884 | dev->read_buffer_length = 0; | |
885 | dev->read_packet_length = 0; | |
886 | spin_lock_init (&dev->read_buffer_lock); | |
887 | dev->packet_timeout_jiffies = packet_timeout * HZ / 1000; | |
888 | dev->read_last_arrival = jiffies; | |
889 | ||
890 | init_waitqueue_head (&dev->read_wait); | |
891 | init_waitqueue_head (&dev->write_wait); | |
892 | ||
893 | dev->interrupt_in_buffer = NULL; | |
894 | dev->interrupt_in_endpoint = NULL; | |
895 | dev->interrupt_in_urb = NULL; | |
896 | dev->interrupt_in_running = 0; | |
897 | dev->interrupt_in_done = 0; | |
898 | ||
899 | dev->interrupt_out_buffer = NULL; | |
900 | dev->interrupt_out_endpoint = NULL; | |
901 | dev->interrupt_out_urb = NULL; | |
902 | dev->interrupt_out_busy = 0; | |
903 | ||
904 | iface_desc = interface->cur_altsetting; | |
905 | ||
906 | /* set up the endpoint information */ | |
907 | for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { | |
908 | endpoint = &iface_desc->endpoint[i].desc; | |
909 | ||
240661c5 LFC |
910 | if (usb_endpoint_xfer_int(endpoint)) { |
911 | if (usb_endpoint_dir_in(endpoint)) | |
912 | dev->interrupt_in_endpoint = endpoint; | |
913 | else | |
914 | dev->interrupt_out_endpoint = endpoint; | |
1da177e4 LT |
915 | } |
916 | } | |
917 | if(dev->interrupt_in_endpoint == NULL) { | |
918 | err("interrupt in endpoint not found"); | |
919 | goto error; | |
920 | } | |
921 | if (dev->interrupt_out_endpoint == NULL) { | |
922 | err("interrupt out endpoint not found"); | |
923 | goto error; | |
924 | } | |
925 | ||
926 | dev->read_buffer = kmalloc (read_buffer_size, GFP_KERNEL); | |
927 | if (!dev->read_buffer) { | |
928 | err("Couldn't allocate read_buffer"); | |
929 | goto error; | |
930 | } | |
29cc8897 | 931 | dev->interrupt_in_buffer = kmalloc (usb_endpoint_maxp(dev->interrupt_in_endpoint), GFP_KERNEL); |
1da177e4 LT |
932 | if (!dev->interrupt_in_buffer) { |
933 | err("Couldn't allocate interrupt_in_buffer"); | |
934 | goto error; | |
935 | } | |
936 | dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL); | |
937 | if (!dev->interrupt_in_urb) { | |
938 | err("Couldn't allocate interrupt_in_urb"); | |
939 | goto error; | |
940 | } | |
941 | dev->interrupt_out_buffer = kmalloc (write_buffer_size, GFP_KERNEL); | |
942 | if (!dev->interrupt_out_buffer) { | |
943 | err("Couldn't allocate interrupt_out_buffer"); | |
944 | goto error; | |
945 | } | |
946 | dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL); | |
947 | if (!dev->interrupt_out_urb) { | |
948 | err("Couldn't allocate interrupt_out_urb"); | |
949 | goto error; | |
950 | } | |
951 | dev->interrupt_in_interval = interrupt_in_interval ? interrupt_in_interval : dev->interrupt_in_endpoint->bInterval; | |
952 | dev->interrupt_out_interval = interrupt_out_interval ? interrupt_out_interval : dev->interrupt_out_endpoint->bInterval; | |
953 | ||
954 | /* we can register the device now, as it is ready */ | |
955 | usb_set_intfdata (interface, dev); | |
956 | ||
957 | retval = usb_register_dev (interface, &tower_class); | |
958 | ||
959 | if (retval) { | |
960 | /* something prevented us from registering this driver */ | |
961 | err ("Not able to get a minor for this device."); | |
962 | usb_set_intfdata (interface, NULL); | |
963 | goto error; | |
964 | } | |
965 | dev->minor = interface->minor; | |
966 | ||
967 | /* let the user know what node this device is now attached to */ | |
1b29a375 GKH |
968 | dev_info(&interface->dev, "LEGO USB Tower #%d now attached to major " |
969 | "%d minor %d\n", (dev->minor - LEGO_USB_TOWER_MINOR_BASE), | |
970 | USB_MAJOR, dev->minor); | |
1da177e4 LT |
971 | |
972 | /* get the firmware version and log it */ | |
973 | result = usb_control_msg (udev, | |
974 | usb_rcvctrlpipe(udev, 0), | |
975 | LEGO_USB_TOWER_REQUEST_GET_VERSION, | |
976 | USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE, | |
977 | 0, | |
978 | 0, | |
979 | &get_version_reply, | |
980 | sizeof(get_version_reply), | |
981 | 1000); | |
982 | if (result < 0) { | |
983 | err("LEGO USB Tower get version control request failed"); | |
984 | retval = result; | |
985 | goto error; | |
986 | } | |
1b29a375 GKH |
987 | dev_info(&interface->dev, "LEGO USB Tower firmware version is %d.%d " |
988 | "build %d\n", get_version_reply.major, | |
989 | get_version_reply.minor, | |
990 | le16_to_cpu(get_version_reply.build_no)); | |
1da177e4 LT |
991 | |
992 | ||
993 | exit: | |
441b62c1 | 994 | dbg(2, "%s: leave, return value 0x%.8lx (dev)", __func__, (long) dev); |
1da177e4 LT |
995 | |
996 | return retval; | |
997 | ||
998 | error: | |
999 | tower_delete(dev); | |
1000 | return retval; | |
1001 | } | |
1002 | ||
1003 | ||
1004 | /** | |
1005 | * tower_disconnect | |
1006 | * | |
1007 | * Called by the usb core when the device is removed from the system. | |
1008 | */ | |
1009 | static void tower_disconnect (struct usb_interface *interface) | |
1010 | { | |
1011 | struct lego_usb_tower *dev; | |
1012 | int minor; | |
1013 | ||
441b62c1 | 1014 | dbg(2, "%s: enter", __func__); |
1da177e4 | 1015 | |
1da177e4 | 1016 | dev = usb_get_intfdata (interface); |
78663ecc | 1017 | mutex_lock(&open_disc_mutex); |
1da177e4 LT |
1018 | usb_set_intfdata (interface, NULL); |
1019 | ||
1da177e4 LT |
1020 | minor = dev->minor; |
1021 | ||
1022 | /* give back our minor */ | |
1023 | usb_deregister_dev (interface, &tower_class); | |
1024 | ||
18bcbcfe | 1025 | mutex_lock(&dev->lock); |
78663ecc | 1026 | mutex_unlock(&open_disc_mutex); |
d4ead16f | 1027 | |
1da177e4 LT |
1028 | /* if the device is not opened, then we clean up right now */ |
1029 | if (!dev->open_count) { | |
18bcbcfe | 1030 | mutex_unlock(&dev->lock); |
1da177e4 LT |
1031 | tower_delete (dev); |
1032 | } else { | |
1033 | dev->udev = NULL; | |
d35b4ce1 ON |
1034 | /* wake up pollers */ |
1035 | wake_up_interruptible_all(&dev->read_wait); | |
1036 | wake_up_interruptible_all(&dev->write_wait); | |
18bcbcfe | 1037 | mutex_unlock(&dev->lock); |
1da177e4 LT |
1038 | } |
1039 | ||
1b29a375 GKH |
1040 | dev_info(&interface->dev, "LEGO USB Tower #%d now disconnected\n", |
1041 | (minor - LEGO_USB_TOWER_MINOR_BASE)); | |
1da177e4 | 1042 | |
441b62c1 | 1043 | dbg(2, "%s: leave", __func__); |
1da177e4 LT |
1044 | } |
1045 | ||
1046 | ||
1047 | ||
1048 | /** | |
1049 | * lego_usb_tower_init | |
1050 | */ | |
1051 | static int __init lego_usb_tower_init(void) | |
1052 | { | |
1053 | int result; | |
1054 | int retval = 0; | |
1055 | ||
441b62c1 | 1056 | dbg(2, "%s: enter", __func__); |
1da177e4 LT |
1057 | |
1058 | /* register this driver with the USB subsystem */ | |
1059 | result = usb_register(&tower_driver); | |
1060 | if (result < 0) { | |
f45ba776 | 1061 | err("usb_register failed for the %s driver. Error number %d", __FILE__, result); |
1da177e4 LT |
1062 | retval = -1; |
1063 | goto exit; | |
1064 | } | |
1065 | ||
1b29a375 GKH |
1066 | printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":" |
1067 | DRIVER_DESC "\n"); | |
1da177e4 LT |
1068 | |
1069 | exit: | |
441b62c1 | 1070 | dbg(2, "%s: leave, return value %d", __func__, retval); |
1da177e4 LT |
1071 | |
1072 | return retval; | |
1073 | } | |
1074 | ||
1075 | ||
1076 | /** | |
1077 | * lego_usb_tower_exit | |
1078 | */ | |
1079 | static void __exit lego_usb_tower_exit(void) | |
1080 | { | |
441b62c1 | 1081 | dbg(2, "%s: enter", __func__); |
1da177e4 LT |
1082 | |
1083 | /* deregister this driver with the USB subsystem */ | |
1084 | usb_deregister (&tower_driver); | |
1085 | ||
441b62c1 | 1086 | dbg(2, "%s: leave", __func__); |
1da177e4 LT |
1087 | } |
1088 | ||
1089 | module_init (lego_usb_tower_init); | |
1090 | module_exit (lego_usb_tower_exit); | |
1091 | ||
1092 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
1093 | MODULE_DESCRIPTION(DRIVER_DESC); | |
1094 | #ifdef MODULE_LICENSE | |
1095 | MODULE_LICENSE("GPL"); | |
1096 | #endif |