Commit | Line | Data |
---|---|---|
c5ac4571 JW |
1 | /* |
2 | * lirc_sasem.c - USB remote support for LIRC | |
3 | * Version 0.5 | |
4 | * | |
5 | * Copyright (C) 2004-2005 Oliver Stabel <oliver.stabel@gmx.de> | |
6 | * Tim Davies <tim@opensystems.net.au> | |
7 | * | |
8 | * This driver was derived from: | |
9 | * Venky Raju <dev@venky.ws> | |
10 | * "lirc_imon - "LIRC/VFD driver for Ahanix/Soundgraph IMON IR/VFD" | |
11 | * Paul Miller <pmiller9@users.sourceforge.net>'s 2003-2004 | |
12 | * "lirc_atiusb - USB remote support for LIRC" | |
13 | * Culver Consulting Services <henry@culcon.com>'s 2003 | |
14 | * "Sasem OnAir VFD/IR USB driver" | |
15 | * | |
16 | * | |
17 | * NOTE - The LCDproc iMon driver should work with this module. More info at | |
18 | * http://www.frogstorm.info/sasem | |
19 | */ | |
20 | ||
21 | /* | |
22 | * This program is free software; you can redistribute it and/or modify | |
23 | * it under the terms of the GNU General Public License as published by | |
24 | * the Free Software Foundation; either version 2 of the License, or | |
25 | * (at your option) any later version. | |
26 | * | |
27 | * This program is distributed in the hope that it will be useful, | |
28 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
29 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
30 | * GNU General Public License for more details. | |
31 | * | |
32 | * You should have received a copy of the GNU General Public License | |
33 | * along with this program; if not, write to the Free Software | |
34 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
35 | */ | |
36 | ||
37 | #include <linux/errno.h> | |
38 | #include <linux/init.h> | |
39 | #include <linux/kernel.h> | |
40 | #include <linux/module.h> | |
41 | #include <linux/slab.h> | |
42 | #include <linux/uaccess.h> | |
43 | #include <linux/usb.h> | |
44 | ||
45 | #include <media/lirc.h> | |
46 | #include <media/lirc_dev.h> | |
47 | ||
48 | ||
49 | #define MOD_AUTHOR "Oliver Stabel <oliver.stabel@gmx.de>, " \ | |
50 | "Tim Davies <tim@opensystems.net.au>" | |
51 | #define MOD_DESC "USB Driver for Sasem Remote Controller V1.1" | |
52 | #define MOD_NAME "lirc_sasem" | |
53 | #define MOD_VERSION "0.5" | |
54 | ||
55 | #define VFD_MINOR_BASE 144 /* Same as LCD */ | |
56 | #define DEVICE_NAME "lcd%d" | |
57 | ||
58 | #define BUF_CHUNK_SIZE 8 | |
59 | #define BUF_SIZE 128 | |
60 | ||
61 | #define IOCTL_LCD_CONTRAST 1 | |
62 | ||
63 | /*** P R O T O T Y P E S ***/ | |
64 | ||
65 | /* USB Callback prototypes */ | |
66 | static int sasem_probe(struct usb_interface *interface, | |
67 | const struct usb_device_id *id); | |
68 | static void sasem_disconnect(struct usb_interface *interface); | |
69 | static void usb_rx_callback(struct urb *urb); | |
70 | static void usb_tx_callback(struct urb *urb); | |
71 | ||
72 | /* VFD file_operations function prototypes */ | |
73 | static int vfd_open(struct inode *inode, struct file *file); | |
74 | static long vfd_ioctl(struct file *file, unsigned cmd, unsigned long arg); | |
75 | static int vfd_close(struct inode *inode, struct file *file); | |
76 | static ssize_t vfd_write(struct file *file, const char *buf, | |
77 | size_t n_bytes, loff_t *pos); | |
78 | ||
79 | /* LIRC driver function prototypes */ | |
80 | static int ir_open(void *data); | |
81 | static void ir_close(void *data); | |
82 | ||
83 | /* Driver init/exit prototypes */ | |
84 | static int __init sasem_init(void); | |
85 | static void __exit sasem_exit(void); | |
86 | ||
87 | /*** G L O B A L S ***/ | |
88 | #define SASEM_DATA_BUF_SZ 32 | |
89 | ||
90 | struct sasem_context { | |
91 | ||
92 | struct usb_device *dev; | |
93 | int vfd_isopen; /* VFD port has been opened */ | |
94 | unsigned int vfd_contrast; /* VFD contrast */ | |
95 | int ir_isopen; /* IR port has been opened */ | |
96 | int dev_present; /* USB device presence */ | |
97 | struct mutex ctx_lock; /* to lock this object */ | |
98 | wait_queue_head_t remove_ok; /* For unexpected USB disconnects */ | |
99 | ||
100 | struct lirc_driver *driver; | |
101 | struct usb_endpoint_descriptor *rx_endpoint; | |
102 | struct usb_endpoint_descriptor *tx_endpoint; | |
103 | struct urb *rx_urb; | |
104 | struct urb *tx_urb; | |
105 | unsigned char usb_rx_buf[8]; | |
106 | unsigned char usb_tx_buf[8]; | |
107 | ||
108 | struct tx_t { | |
109 | unsigned char data_buf[SASEM_DATA_BUF_SZ]; /* user data buffer */ | |
110 | struct completion finished; /* wait for write to finish */ | |
111 | atomic_t busy; /* write in progress */ | |
112 | int status; /* status of tx completion */ | |
113 | } tx; | |
114 | ||
115 | /* for dealing with repeat codes (wish there was a toggle bit!) */ | |
116 | struct timeval presstime; | |
117 | char lastcode[8]; | |
118 | int codesaved; | |
119 | }; | |
120 | ||
121 | /* VFD file operations */ | |
0f9313ad | 122 | static const struct file_operations vfd_fops = { |
c5ac4571 JW |
123 | .owner = THIS_MODULE, |
124 | .open = &vfd_open, | |
125 | .write = &vfd_write, | |
126 | .unlocked_ioctl = &vfd_ioctl, | |
127 | .release = &vfd_close, | |
6038f373 | 128 | .llseek = noop_llseek, |
c5ac4571 JW |
129 | }; |
130 | ||
131 | /* USB Device ID for Sasem USB Control Board */ | |
132 | static struct usb_device_id sasem_usb_id_table[] = { | |
133 | /* Sasem USB Control Board */ | |
134 | { USB_DEVICE(0x11ba, 0x0101) }, | |
135 | /* Terminating entry */ | |
136 | {} | |
137 | }; | |
138 | ||
139 | /* USB Device data */ | |
140 | static struct usb_driver sasem_driver = { | |
141 | .name = MOD_NAME, | |
142 | .probe = sasem_probe, | |
143 | .disconnect = sasem_disconnect, | |
144 | .id_table = sasem_usb_id_table, | |
145 | }; | |
146 | ||
147 | static struct usb_class_driver sasem_class = { | |
148 | .name = DEVICE_NAME, | |
149 | .fops = &vfd_fops, | |
150 | .minor_base = VFD_MINOR_BASE, | |
151 | }; | |
152 | ||
153 | /* to prevent races between open() and disconnect() */ | |
154 | static DEFINE_MUTEX(disconnect_lock); | |
155 | ||
156 | static int debug; | |
157 | ||
158 | ||
159 | /*** M O D U L E C O D E ***/ | |
160 | ||
161 | MODULE_AUTHOR(MOD_AUTHOR); | |
162 | MODULE_DESCRIPTION(MOD_DESC); | |
163 | MODULE_LICENSE("GPL"); | |
164 | module_param(debug, int, S_IRUGO | S_IWUSR); | |
165 | MODULE_PARM_DESC(debug, "Debug messages: 0=no, 1=yes (default: no)"); | |
166 | ||
167 | static void delete_context(struct sasem_context *context) | |
168 | { | |
169 | usb_free_urb(context->tx_urb); /* VFD */ | |
170 | usb_free_urb(context->rx_urb); /* IR */ | |
171 | lirc_buffer_free(context->driver->rbuf); | |
172 | kfree(context->driver->rbuf); | |
173 | kfree(context->driver); | |
174 | kfree(context); | |
175 | ||
176 | if (debug) | |
177 | printk(KERN_INFO "%s: context deleted\n", __func__); | |
178 | } | |
179 | ||
180 | static void deregister_from_lirc(struct sasem_context *context) | |
181 | { | |
182 | int retval; | |
183 | int minor = context->driver->minor; | |
184 | ||
185 | retval = lirc_unregister_driver(minor); | |
186 | if (retval) | |
187 | err("%s: unable to deregister from lirc (%d)", | |
188 | __func__, retval); | |
189 | else | |
190 | printk(KERN_INFO "Deregistered Sasem driver (minor:%d)\n", | |
191 | minor); | |
192 | ||
193 | } | |
194 | ||
195 | /** | |
196 | * Called when the VFD device (e.g. /dev/usb/lcd) | |
197 | * is opened by the application. | |
198 | */ | |
199 | static int vfd_open(struct inode *inode, struct file *file) | |
200 | { | |
201 | struct usb_interface *interface; | |
202 | struct sasem_context *context = NULL; | |
203 | int subminor; | |
204 | int retval = 0; | |
205 | ||
206 | /* prevent races with disconnect */ | |
207 | mutex_lock(&disconnect_lock); | |
208 | ||
209 | subminor = iminor(inode); | |
210 | interface = usb_find_interface(&sasem_driver, subminor); | |
211 | if (!interface) { | |
212 | err("%s: could not find interface for minor %d", | |
213 | __func__, subminor); | |
214 | retval = -ENODEV; | |
215 | goto exit; | |
216 | } | |
217 | context = usb_get_intfdata(interface); | |
218 | ||
219 | if (!context) { | |
220 | err("%s: no context found for minor %d", | |
221 | __func__, subminor); | |
222 | retval = -ENODEV; | |
223 | goto exit; | |
224 | } | |
225 | ||
226 | mutex_lock(&context->ctx_lock); | |
227 | ||
228 | if (context->vfd_isopen) { | |
229 | err("%s: VFD port is already open", __func__); | |
230 | retval = -EBUSY; | |
231 | } else { | |
232 | context->vfd_isopen = 1; | |
233 | file->private_data = context; | |
234 | printk(KERN_INFO "VFD port opened\n"); | |
235 | } | |
236 | ||
237 | mutex_unlock(&context->ctx_lock); | |
238 | ||
239 | exit: | |
240 | mutex_unlock(&disconnect_lock); | |
241 | return retval; | |
242 | } | |
243 | ||
244 | /** | |
245 | * Called when the VFD device (e.g. /dev/usb/lcd) | |
246 | * is closed by the application. | |
247 | */ | |
248 | static long vfd_ioctl(struct file *file, unsigned cmd, unsigned long arg) | |
249 | { | |
250 | struct sasem_context *context = NULL; | |
251 | ||
252 | context = (struct sasem_context *) file->private_data; | |
253 | ||
254 | if (!context) { | |
255 | err("%s: no context for device", __func__); | |
256 | return -ENODEV; | |
257 | } | |
258 | ||
259 | mutex_lock(&context->ctx_lock); | |
260 | ||
261 | switch (cmd) { | |
262 | case IOCTL_LCD_CONTRAST: | |
263 | if (arg > 1000) | |
264 | arg = 1000; | |
265 | context->vfd_contrast = (unsigned int)arg; | |
266 | break; | |
267 | default: | |
268 | printk(KERN_INFO "Unknown IOCTL command\n"); | |
269 | mutex_unlock(&context->ctx_lock); | |
270 | return -ENOIOCTLCMD; /* not supported */ | |
271 | } | |
272 | ||
273 | mutex_unlock(&context->ctx_lock); | |
274 | return 0; | |
275 | } | |
276 | ||
277 | /** | |
278 | * Called when the VFD device (e.g. /dev/usb/lcd) | |
279 | * is closed by the application. | |
280 | */ | |
281 | static int vfd_close(struct inode *inode, struct file *file) | |
282 | { | |
283 | struct sasem_context *context = NULL; | |
284 | int retval = 0; | |
285 | ||
286 | context = (struct sasem_context *) file->private_data; | |
287 | ||
288 | if (!context) { | |
289 | err("%s: no context for device", __func__); | |
290 | return -ENODEV; | |
291 | } | |
292 | ||
293 | mutex_lock(&context->ctx_lock); | |
294 | ||
295 | if (!context->vfd_isopen) { | |
296 | err("%s: VFD is not open", __func__); | |
297 | retval = -EIO; | |
298 | } else { | |
299 | context->vfd_isopen = 0; | |
300 | printk(KERN_INFO "VFD port closed\n"); | |
301 | if (!context->dev_present && !context->ir_isopen) { | |
302 | ||
303 | /* Device disconnected before close and IR port is | |
304 | * not open. If IR port is open, context will be | |
305 | * deleted by ir_close. */ | |
306 | mutex_unlock(&context->ctx_lock); | |
307 | delete_context(context); | |
308 | return retval; | |
309 | } | |
310 | } | |
311 | ||
312 | mutex_unlock(&context->ctx_lock); | |
313 | return retval; | |
314 | } | |
315 | ||
316 | /** | |
317 | * Sends a packet to the VFD. | |
318 | */ | |
319 | static int send_packet(struct sasem_context *context) | |
320 | { | |
321 | unsigned int pipe; | |
322 | int interval = 0; | |
323 | int retval = 0; | |
324 | ||
325 | pipe = usb_sndintpipe(context->dev, | |
326 | context->tx_endpoint->bEndpointAddress); | |
327 | interval = context->tx_endpoint->bInterval; | |
328 | ||
329 | usb_fill_int_urb(context->tx_urb, context->dev, pipe, | |
330 | context->usb_tx_buf, sizeof(context->usb_tx_buf), | |
331 | usb_tx_callback, context, interval); | |
332 | ||
333 | context->tx_urb->actual_length = 0; | |
334 | ||
335 | init_completion(&context->tx.finished); | |
336 | atomic_set(&(context->tx.busy), 1); | |
337 | ||
338 | retval = usb_submit_urb(context->tx_urb, GFP_KERNEL); | |
339 | if (retval) { | |
340 | atomic_set(&(context->tx.busy), 0); | |
341 | err("%s: error submitting urb (%d)", __func__, retval); | |
342 | } else { | |
343 | /* Wait for transmission to complete (or abort) */ | |
344 | mutex_unlock(&context->ctx_lock); | |
345 | wait_for_completion(&context->tx.finished); | |
346 | mutex_lock(&context->ctx_lock); | |
347 | ||
348 | retval = context->tx.status; | |
349 | if (retval) | |
350 | err("%s: packet tx failed (%d)", __func__, retval); | |
351 | } | |
352 | ||
353 | return retval; | |
354 | } | |
355 | ||
356 | /** | |
357 | * Writes data to the VFD. The Sasem VFD is 2x16 characters | |
358 | * and requires data in 9 consecutive USB interrupt packets, | |
359 | * each packet carrying 8 bytes. | |
360 | */ | |
361 | static ssize_t vfd_write(struct file *file, const char *buf, | |
362 | size_t n_bytes, loff_t *pos) | |
363 | { | |
364 | int i; | |
365 | int retval = 0; | |
366 | struct sasem_context *context; | |
367 | int *data_buf; | |
368 | ||
369 | context = (struct sasem_context *) file->private_data; | |
370 | if (!context) { | |
371 | err("%s: no context for device", __func__); | |
372 | return -ENODEV; | |
373 | } | |
374 | ||
375 | mutex_lock(&context->ctx_lock); | |
376 | ||
377 | if (!context->dev_present) { | |
378 | err("%s: no Sasem device present", __func__); | |
379 | retval = -ENODEV; | |
380 | goto exit; | |
381 | } | |
382 | ||
383 | if (n_bytes <= 0 || n_bytes > SASEM_DATA_BUF_SZ) { | |
384 | err("%s: invalid payload size", __func__); | |
385 | retval = -EINVAL; | |
386 | goto exit; | |
387 | } | |
388 | ||
389 | data_buf = memdup_user(buf, n_bytes); | |
390 | if (PTR_ERR(data_buf)) | |
391 | return PTR_ERR(data_buf); | |
392 | ||
393 | memcpy(context->tx.data_buf, data_buf, n_bytes); | |
394 | ||
395 | /* Pad with spaces */ | |
396 | for (i = n_bytes; i < SASEM_DATA_BUF_SZ; ++i) | |
397 | context->tx.data_buf[i] = ' '; | |
398 | ||
399 | /* Nine 8 byte packets to be sent */ | |
400 | /* NOTE: "\x07\x01\0\0\0\0\0\0" or "\x0c\0\0\0\0\0\0\0" | |
401 | * will clear the VFD */ | |
402 | for (i = 0; i < 9; i++) { | |
403 | switch (i) { | |
404 | case 0: | |
405 | memcpy(context->usb_tx_buf, "\x07\0\0\0\0\0\0\0", 8); | |
406 | context->usb_tx_buf[1] = (context->vfd_contrast) ? | |
407 | (0x2B - (context->vfd_contrast - 1) / 250) | |
408 | : 0x2B; | |
409 | break; | |
410 | case 1: | |
411 | memcpy(context->usb_tx_buf, "\x09\x01\0\0\0\0\0\0", 8); | |
412 | break; | |
413 | case 2: | |
414 | memcpy(context->usb_tx_buf, "\x0b\x01\0\0\0\0\0\0", 8); | |
415 | break; | |
416 | case 3: | |
417 | memcpy(context->usb_tx_buf, context->tx.data_buf, 8); | |
418 | break; | |
419 | case 4: | |
420 | memcpy(context->usb_tx_buf, | |
421 | context->tx.data_buf + 8, 8); | |
422 | break; | |
423 | case 5: | |
424 | memcpy(context->usb_tx_buf, "\x09\x01\0\0\0\0\0\0", 8); | |
425 | break; | |
426 | case 6: | |
427 | memcpy(context->usb_tx_buf, "\x0b\x02\0\0\0\0\0\0", 8); | |
428 | break; | |
429 | case 7: | |
430 | memcpy(context->usb_tx_buf, | |
431 | context->tx.data_buf + 16, 8); | |
432 | break; | |
433 | case 8: | |
434 | memcpy(context->usb_tx_buf, | |
435 | context->tx.data_buf + 24, 8); | |
436 | break; | |
437 | } | |
438 | retval = send_packet(context); | |
439 | if (retval) { | |
440 | ||
441 | err("%s: send packet failed for packet #%d", | |
442 | __func__, i); | |
443 | goto exit; | |
444 | } | |
445 | } | |
446 | exit: | |
447 | ||
448 | mutex_unlock(&context->ctx_lock); | |
449 | ||
450 | return (!retval) ? n_bytes : retval; | |
451 | } | |
452 | ||
453 | /** | |
454 | * Callback function for USB core API: transmit data | |
455 | */ | |
456 | static void usb_tx_callback(struct urb *urb) | |
457 | { | |
458 | struct sasem_context *context; | |
459 | ||
460 | if (!urb) | |
461 | return; | |
462 | context = (struct sasem_context *) urb->context; | |
463 | if (!context) | |
464 | return; | |
465 | ||
466 | context->tx.status = urb->status; | |
467 | ||
468 | /* notify waiters that write has finished */ | |
469 | atomic_set(&context->tx.busy, 0); | |
470 | complete(&context->tx.finished); | |
471 | ||
472 | return; | |
473 | } | |
474 | ||
475 | /** | |
476 | * Called by lirc_dev when the application opens /dev/lirc | |
477 | */ | |
478 | static int ir_open(void *data) | |
479 | { | |
480 | int retval = 0; | |
481 | struct sasem_context *context; | |
482 | ||
483 | /* prevent races with disconnect */ | |
484 | mutex_lock(&disconnect_lock); | |
485 | ||
486 | context = (struct sasem_context *) data; | |
487 | ||
488 | mutex_lock(&context->ctx_lock); | |
489 | ||
490 | if (context->ir_isopen) { | |
491 | err("%s: IR port is already open", __func__); | |
492 | retval = -EBUSY; | |
493 | goto exit; | |
494 | } | |
495 | ||
496 | usb_fill_int_urb(context->rx_urb, context->dev, | |
497 | usb_rcvintpipe(context->dev, | |
498 | context->rx_endpoint->bEndpointAddress), | |
499 | context->usb_rx_buf, sizeof(context->usb_rx_buf), | |
500 | usb_rx_callback, context, context->rx_endpoint->bInterval); | |
501 | ||
502 | retval = usb_submit_urb(context->rx_urb, GFP_KERNEL); | |
503 | ||
504 | if (retval) | |
505 | err("%s: usb_submit_urb failed for ir_open (%d)", | |
506 | __func__, retval); | |
507 | else { | |
508 | context->ir_isopen = 1; | |
509 | printk(KERN_INFO "IR port opened\n"); | |
510 | } | |
511 | ||
512 | exit: | |
513 | mutex_unlock(&context->ctx_lock); | |
514 | ||
515 | mutex_unlock(&disconnect_lock); | |
516 | return 0; | |
517 | } | |
518 | ||
519 | /** | |
520 | * Called by lirc_dev when the application closes /dev/lirc | |
521 | */ | |
522 | static void ir_close(void *data) | |
523 | { | |
524 | struct sasem_context *context; | |
525 | ||
526 | context = (struct sasem_context *)data; | |
527 | if (!context) { | |
528 | err("%s: no context for device", __func__); | |
529 | return; | |
530 | } | |
531 | ||
532 | mutex_lock(&context->ctx_lock); | |
533 | ||
534 | usb_kill_urb(context->rx_urb); | |
535 | context->ir_isopen = 0; | |
536 | printk(KERN_INFO "IR port closed\n"); | |
537 | ||
538 | if (!context->dev_present) { | |
539 | ||
540 | /* | |
541 | * Device disconnected while IR port was | |
542 | * still open. Driver was not deregistered | |
543 | * at disconnect time, so do it now. | |
544 | */ | |
545 | deregister_from_lirc(context); | |
546 | ||
547 | if (!context->vfd_isopen) { | |
548 | ||
549 | mutex_unlock(&context->ctx_lock); | |
550 | delete_context(context); | |
551 | return; | |
552 | } | |
553 | /* If VFD port is open, context will be deleted by vfd_close */ | |
554 | } | |
555 | ||
556 | mutex_unlock(&context->ctx_lock); | |
557 | return; | |
558 | } | |
559 | ||
560 | /** | |
561 | * Process the incoming packet | |
562 | */ | |
563 | static void incoming_packet(struct sasem_context *context, | |
564 | struct urb *urb) | |
565 | { | |
566 | int len = urb->actual_length; | |
567 | unsigned char *buf = urb->transfer_buffer; | |
568 | long ms; | |
569 | struct timeval tv; | |
570 | ||
571 | if (len != 8) { | |
572 | printk(KERN_WARNING "%s: invalid incoming packet size (%d)\n", | |
573 | __func__, len); | |
574 | return; | |
575 | } | |
576 | ||
577 | #ifdef DEBUG | |
578 | int i; | |
579 | for (i = 0; i < 8; ++i) | |
580 | printk(KERN_INFO "%02x ", buf[i]); | |
581 | printk(KERN_INFO "\n"); | |
582 | #endif | |
583 | ||
584 | /* | |
585 | * Lirc could deal with the repeat code, but we really need to block it | |
586 | * if it arrives too late. Otherwise we could repeat the wrong code. | |
587 | */ | |
588 | ||
589 | /* get the time since the last button press */ | |
590 | do_gettimeofday(&tv); | |
591 | ms = (tv.tv_sec - context->presstime.tv_sec) * 1000 + | |
592 | (tv.tv_usec - context->presstime.tv_usec) / 1000; | |
593 | ||
594 | if (memcmp(buf, "\x08\0\0\0\0\0\0\0", 8) == 0) { | |
595 | /* | |
596 | * the repeat code is being sent, so we copy | |
597 | * the old code to LIRC | |
598 | */ | |
599 | ||
600 | /* | |
601 | * NOTE: Only if the last code was less than 250ms ago | |
602 | * - no one should be able to push another (undetected) button | |
603 | * in that time and then get a false repeat of the previous | |
604 | * press but it is long enough for a genuine repeat | |
605 | */ | |
606 | if ((ms < 250) && (context->codesaved != 0)) { | |
607 | memcpy(buf, &context->lastcode, 8); | |
608 | context->presstime.tv_sec = tv.tv_sec; | |
609 | context->presstime.tv_usec = tv.tv_usec; | |
610 | } | |
611 | } else { | |
612 | /* save the current valid code for repeats */ | |
613 | memcpy(&context->lastcode, buf, 8); | |
614 | /* | |
615 | * set flag to signal a valid code was save; | |
616 | * just for safety reasons | |
617 | */ | |
618 | context->codesaved = 1; | |
619 | context->presstime.tv_sec = tv.tv_sec; | |
620 | context->presstime.tv_usec = tv.tv_usec; | |
621 | } | |
622 | ||
623 | lirc_buffer_write(context->driver->rbuf, buf); | |
624 | wake_up(&context->driver->rbuf->wait_poll); | |
625 | } | |
626 | ||
627 | /** | |
628 | * Callback function for USB core API: receive data | |
629 | */ | |
630 | static void usb_rx_callback(struct urb *urb) | |
631 | { | |
632 | struct sasem_context *context; | |
633 | ||
634 | if (!urb) | |
635 | return; | |
636 | context = (struct sasem_context *) urb->context; | |
637 | if (!context) | |
638 | return; | |
639 | ||
640 | switch (urb->status) { | |
641 | ||
642 | case -ENOENT: /* usbcore unlink successful! */ | |
643 | return; | |
644 | ||
645 | case 0: | |
646 | if (context->ir_isopen) | |
647 | incoming_packet(context, urb); | |
648 | break; | |
649 | ||
650 | default: | |
651 | printk(KERN_WARNING "%s: status (%d): ignored", | |
652 | __func__, urb->status); | |
653 | break; | |
654 | } | |
655 | ||
656 | usb_submit_urb(context->rx_urb, GFP_ATOMIC); | |
657 | return; | |
658 | } | |
659 | ||
660 | ||
661 | ||
662 | /** | |
663 | * Callback function for USB core API: Probe | |
664 | */ | |
665 | static int sasem_probe(struct usb_interface *interface, | |
666 | const struct usb_device_id *id) | |
667 | { | |
668 | struct usb_device *dev = NULL; | |
669 | struct usb_host_interface *iface_desc = NULL; | |
670 | struct usb_endpoint_descriptor *rx_endpoint = NULL; | |
671 | struct usb_endpoint_descriptor *tx_endpoint = NULL; | |
672 | struct urb *rx_urb = NULL; | |
673 | struct urb *tx_urb = NULL; | |
674 | struct lirc_driver *driver = NULL; | |
675 | struct lirc_buffer *rbuf = NULL; | |
676 | int lirc_minor = 0; | |
677 | int num_endpoints; | |
678 | int retval = 0; | |
679 | int vfd_ep_found; | |
680 | int ir_ep_found; | |
681 | int alloc_status; | |
682 | struct sasem_context *context = NULL; | |
683 | int i; | |
684 | ||
685 | printk(KERN_INFO "%s: found Sasem device\n", __func__); | |
686 | ||
687 | ||
688 | dev = usb_get_dev(interface_to_usbdev(interface)); | |
689 | iface_desc = interface->cur_altsetting; | |
690 | num_endpoints = iface_desc->desc.bNumEndpoints; | |
691 | ||
692 | /* | |
693 | * Scan the endpoint list and set: | |
694 | * first input endpoint = IR endpoint | |
695 | * first output endpoint = VFD endpoint | |
696 | */ | |
697 | ||
698 | ir_ep_found = 0; | |
699 | vfd_ep_found = 0; | |
700 | ||
701 | for (i = 0; i < num_endpoints && !(ir_ep_found && vfd_ep_found); ++i) { | |
702 | ||
703 | struct usb_endpoint_descriptor *ep; | |
704 | int ep_dir; | |
705 | int ep_type; | |
706 | ep = &iface_desc->endpoint [i].desc; | |
707 | ep_dir = ep->bEndpointAddress & USB_ENDPOINT_DIR_MASK; | |
708 | ep_type = ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK; | |
709 | ||
710 | if (!ir_ep_found && | |
711 | ep_dir == USB_DIR_IN && | |
712 | ep_type == USB_ENDPOINT_XFER_INT) { | |
713 | ||
714 | rx_endpoint = ep; | |
715 | ir_ep_found = 1; | |
716 | if (debug) | |
717 | printk(KERN_INFO "%s: found IR endpoint\n", | |
718 | __func__); | |
719 | ||
720 | } else if (!vfd_ep_found && | |
721 | ep_dir == USB_DIR_OUT && | |
722 | ep_type == USB_ENDPOINT_XFER_INT) { | |
723 | ||
724 | tx_endpoint = ep; | |
725 | vfd_ep_found = 1; | |
726 | if (debug) | |
727 | printk(KERN_INFO "%s: found VFD endpoint\n", | |
728 | __func__); | |
729 | } | |
730 | } | |
731 | ||
732 | /* Input endpoint is mandatory */ | |
733 | if (!ir_ep_found) { | |
734 | ||
735 | err("%s: no valid input (IR) endpoint found.", __func__); | |
736 | retval = -ENODEV; | |
737 | goto exit; | |
738 | } | |
739 | ||
740 | if (!vfd_ep_found) | |
741 | printk(KERN_INFO "%s: no valid output (VFD) endpoint found.\n", | |
742 | __func__); | |
743 | ||
744 | ||
745 | /* Allocate memory */ | |
746 | alloc_status = 0; | |
747 | ||
748 | context = kzalloc(sizeof(struct sasem_context), GFP_KERNEL); | |
749 | if (!context) { | |
750 | err("%s: kzalloc failed for context", __func__); | |
751 | alloc_status = 1; | |
752 | goto alloc_status_switch; | |
753 | } | |
754 | driver = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL); | |
755 | if (!driver) { | |
756 | err("%s: kzalloc failed for lirc_driver", __func__); | |
757 | alloc_status = 2; | |
758 | goto alloc_status_switch; | |
759 | } | |
760 | rbuf = kmalloc(sizeof(struct lirc_buffer), GFP_KERNEL); | |
761 | if (!rbuf) { | |
762 | err("%s: kmalloc failed for lirc_buffer", __func__); | |
763 | alloc_status = 3; | |
764 | goto alloc_status_switch; | |
765 | } | |
766 | if (lirc_buffer_init(rbuf, BUF_CHUNK_SIZE, BUF_SIZE)) { | |
767 | err("%s: lirc_buffer_init failed", __func__); | |
768 | alloc_status = 4; | |
769 | goto alloc_status_switch; | |
770 | } | |
771 | rx_urb = usb_alloc_urb(0, GFP_KERNEL); | |
772 | if (!rx_urb) { | |
773 | err("%s: usb_alloc_urb failed for IR urb", __func__); | |
774 | alloc_status = 5; | |
775 | goto alloc_status_switch; | |
776 | } | |
777 | if (vfd_ep_found) { | |
778 | tx_urb = usb_alloc_urb(0, GFP_KERNEL); | |
779 | if (!tx_urb) { | |
780 | err("%s: usb_alloc_urb failed for VFD urb", | |
781 | __func__); | |
782 | alloc_status = 6; | |
783 | goto alloc_status_switch; | |
784 | } | |
785 | } | |
786 | ||
787 | mutex_init(&context->ctx_lock); | |
788 | ||
789 | strcpy(driver->name, MOD_NAME); | |
790 | driver->minor = -1; | |
791 | driver->code_length = 64; | |
792 | driver->sample_rate = 0; | |
793 | driver->features = LIRC_CAN_REC_LIRCCODE; | |
794 | driver->data = context; | |
795 | driver->rbuf = rbuf; | |
796 | driver->set_use_inc = ir_open; | |
797 | driver->set_use_dec = ir_close; | |
798 | driver->dev = &interface->dev; | |
799 | driver->owner = THIS_MODULE; | |
800 | ||
801 | mutex_lock(&context->ctx_lock); | |
802 | ||
803 | lirc_minor = lirc_register_driver(driver); | |
804 | if (lirc_minor < 0) { | |
805 | err("%s: lirc_register_driver failed", __func__); | |
806 | alloc_status = 7; | |
807 | mutex_unlock(&context->ctx_lock); | |
808 | } else | |
809 | printk(KERN_INFO "%s: Registered Sasem driver (minor:%d)\n", | |
810 | __func__, lirc_minor); | |
811 | ||
812 | alloc_status_switch: | |
813 | ||
814 | switch (alloc_status) { | |
815 | ||
816 | case 7: | |
817 | if (vfd_ep_found) | |
818 | usb_free_urb(tx_urb); | |
819 | case 6: | |
820 | usb_free_urb(rx_urb); | |
821 | case 5: | |
822 | lirc_buffer_free(rbuf); | |
823 | case 4: | |
824 | kfree(rbuf); | |
825 | case 3: | |
826 | kfree(driver); | |
827 | case 2: | |
828 | kfree(context); | |
829 | context = NULL; | |
830 | case 1: | |
831 | retval = -ENOMEM; | |
832 | goto exit; | |
833 | } | |
834 | ||
835 | /* Needed while unregistering! */ | |
836 | driver->minor = lirc_minor; | |
837 | ||
838 | context->dev = dev; | |
839 | context->dev_present = 1; | |
840 | context->rx_endpoint = rx_endpoint; | |
841 | context->rx_urb = rx_urb; | |
842 | if (vfd_ep_found) { | |
843 | context->tx_endpoint = tx_endpoint; | |
844 | context->tx_urb = tx_urb; | |
845 | context->vfd_contrast = 1000; /* range 0 - 1000 */ | |
846 | } | |
847 | context->driver = driver; | |
848 | ||
849 | usb_set_intfdata(interface, context); | |
850 | ||
851 | if (vfd_ep_found) { | |
852 | ||
853 | if (debug) | |
854 | printk(KERN_INFO "Registering VFD with sysfs\n"); | |
855 | if (usb_register_dev(interface, &sasem_class)) | |
856 | /* Not a fatal error, so ignore */ | |
857 | printk(KERN_INFO "%s: could not get a minor number " | |
858 | "for VFD\n", __func__); | |
859 | } | |
860 | ||
861 | printk(KERN_INFO "%s: Sasem device on usb<%d:%d> initialized\n", | |
862 | __func__, dev->bus->busnum, dev->devnum); | |
863 | ||
864 | mutex_unlock(&context->ctx_lock); | |
865 | exit: | |
866 | return retval; | |
867 | } | |
868 | ||
869 | /** | |
870 | * Callback function for USB core API: disonnect | |
871 | */ | |
872 | static void sasem_disconnect(struct usb_interface *interface) | |
873 | { | |
874 | struct sasem_context *context; | |
875 | ||
876 | /* prevent races with ir_open()/vfd_open() */ | |
877 | mutex_lock(&disconnect_lock); | |
878 | ||
879 | context = usb_get_intfdata(interface); | |
880 | mutex_lock(&context->ctx_lock); | |
881 | ||
882 | printk(KERN_INFO "%s: Sasem device disconnected\n", __func__); | |
883 | ||
884 | usb_set_intfdata(interface, NULL); | |
885 | context->dev_present = 0; | |
886 | ||
887 | /* Stop reception */ | |
888 | usb_kill_urb(context->rx_urb); | |
889 | ||
890 | /* Abort ongoing write */ | |
891 | if (atomic_read(&context->tx.busy)) { | |
892 | ||
893 | usb_kill_urb(context->tx_urb); | |
894 | wait_for_completion(&context->tx.finished); | |
895 | } | |
896 | ||
897 | /* De-register from lirc_dev if IR port is not open */ | |
898 | if (!context->ir_isopen) | |
899 | deregister_from_lirc(context); | |
900 | ||
901 | usb_deregister_dev(interface, &sasem_class); | |
902 | ||
903 | mutex_unlock(&context->ctx_lock); | |
904 | ||
905 | if (!context->ir_isopen && !context->vfd_isopen) | |
906 | delete_context(context); | |
907 | ||
908 | mutex_unlock(&disconnect_lock); | |
909 | } | |
910 | ||
911 | static int __init sasem_init(void) | |
912 | { | |
913 | int rc; | |
914 | ||
915 | printk(KERN_INFO MOD_DESC ", v" MOD_VERSION "\n"); | |
916 | printk(KERN_INFO MOD_AUTHOR "\n"); | |
917 | ||
918 | rc = usb_register(&sasem_driver); | |
919 | if (rc < 0) { | |
920 | err("%s: usb register failed (%d)", __func__, rc); | |
921 | return -ENODEV; | |
922 | } | |
923 | return 0; | |
924 | } | |
925 | ||
926 | static void __exit sasem_exit(void) | |
927 | { | |
928 | usb_deregister(&sasem_driver); | |
929 | printk(KERN_INFO "module removed. Goodbye!\n"); | |
930 | } | |
931 | ||
932 | ||
933 | module_init(sasem_init); | |
934 | module_exit(sasem_exit); |