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