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