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