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 */
122 static const struct file_operations vfd_fops = {
123 .owner = THIS_MODULE,
124 .open = &vfd_open,
125 .write = &vfd_write,
126 .unlocked_ioctl = &vfd_ioctl,
127 .release = &vfd_close,
128 .llseek = noop_llseek,
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
delete_context(struct sasem_context * context)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
deregister_from_lirc(struct sasem_context * context)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 */
vfd_open(struct inode * inode,struct file * file)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 */
vfd_ioctl(struct file * file,unsigned cmd,unsigned long arg)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 */
vfd_close(struct inode * inode,struct file * file)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 */
send_packet(struct sasem_context * context)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 */
vfd_write(struct file * file,const char * buf,size_t n_bytes,loff_t * pos)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 = NULL;
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 (IS_ERR(data_buf)) {
391 retval = PTR_ERR(data_buf);
392 goto exit;
393 }
394
395 memcpy(context->tx.data_buf, data_buf, n_bytes);
396
397 /* Pad with spaces */
398 for (i = n_bytes; i < SASEM_DATA_BUF_SZ; ++i)
399 context->tx.data_buf[i] = ' ';
400
401 /* Nine 8 byte packets to be sent */
402 /* NOTE: "\x07\x01\0\0\0\0\0\0" or "\x0c\0\0\0\0\0\0\0"
403 * will clear the VFD */
404 for (i = 0; i < 9; i++) {
405 switch (i) {
406 case 0:
407 memcpy(context->usb_tx_buf, "\x07\0\0\0\0\0\0\0", 8);
408 context->usb_tx_buf[1] = (context->vfd_contrast) ?
409 (0x2B - (context->vfd_contrast - 1) / 250)
410 : 0x2B;
411 break;
412 case 1:
413 memcpy(context->usb_tx_buf, "\x09\x01\0\0\0\0\0\0", 8);
414 break;
415 case 2:
416 memcpy(context->usb_tx_buf, "\x0b\x01\0\0\0\0\0\0", 8);
417 break;
418 case 3:
419 memcpy(context->usb_tx_buf, context->tx.data_buf, 8);
420 break;
421 case 4:
422 memcpy(context->usb_tx_buf,
423 context->tx.data_buf + 8, 8);
424 break;
425 case 5:
426 memcpy(context->usb_tx_buf, "\x09\x01\0\0\0\0\0\0", 8);
427 break;
428 case 6:
429 memcpy(context->usb_tx_buf, "\x0b\x02\0\0\0\0\0\0", 8);
430 break;
431 case 7:
432 memcpy(context->usb_tx_buf,
433 context->tx.data_buf + 16, 8);
434 break;
435 case 8:
436 memcpy(context->usb_tx_buf,
437 context->tx.data_buf + 24, 8);
438 break;
439 }
440 retval = send_packet(context);
441 if (retval) {
442
443 err("%s: send packet failed for packet #%d",
444 __func__, 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 return;
476 }
477
478 /**
479 * Called by lirc_dev when the application opens /dev/lirc
480 */
ir_open(void * data)481 static int ir_open(void *data)
482 {
483 int retval = 0;
484 struct sasem_context *context;
485
486 /* prevent races with disconnect */
487 mutex_lock(&disconnect_lock);
488
489 context = (struct sasem_context *) data;
490
491 mutex_lock(&context->ctx_lock);
492
493 if (context->ir_isopen) {
494 err("%s: IR port is already open", __func__);
495 retval = -EBUSY;
496 goto exit;
497 }
498
499 usb_fill_int_urb(context->rx_urb, context->dev,
500 usb_rcvintpipe(context->dev,
501 context->rx_endpoint->bEndpointAddress),
502 context->usb_rx_buf, sizeof(context->usb_rx_buf),
503 usb_rx_callback, context, context->rx_endpoint->bInterval);
504
505 retval = usb_submit_urb(context->rx_urb, GFP_KERNEL);
506
507 if (retval)
508 err("%s: usb_submit_urb failed for ir_open (%d)",
509 __func__, retval);
510 else {
511 context->ir_isopen = 1;
512 printk(KERN_INFO "IR port opened\n");
513 }
514
515 exit:
516 mutex_unlock(&context->ctx_lock);
517
518 mutex_unlock(&disconnect_lock);
519 return retval;
520 }
521
522 /**
523 * Called by lirc_dev when the application closes /dev/lirc
524 */
ir_close(void * data)525 static void ir_close(void *data)
526 {
527 struct sasem_context *context;
528
529 context = (struct sasem_context *)data;
530 if (!context) {
531 err("%s: no context for device", __func__);
532 return;
533 }
534
535 mutex_lock(&context->ctx_lock);
536
537 usb_kill_urb(context->rx_urb);
538 context->ir_isopen = 0;
539 printk(KERN_INFO "IR port closed\n");
540
541 if (!context->dev_present) {
542
543 /*
544 * Device disconnected while IR port was
545 * still open. Driver was not deregistered
546 * at disconnect time, so do it now.
547 */
548 deregister_from_lirc(context);
549
550 if (!context->vfd_isopen) {
551
552 mutex_unlock(&context->ctx_lock);
553 delete_context(context);
554 return;
555 }
556 /* If VFD port is open, context will be deleted by vfd_close */
557 }
558
559 mutex_unlock(&context->ctx_lock);
560 return;
561 }
562
563 /**
564 * Process the incoming packet
565 */
incoming_packet(struct sasem_context * context,struct urb * urb)566 static void incoming_packet(struct sasem_context *context,
567 struct urb *urb)
568 {
569 int len = urb->actual_length;
570 unsigned char *buf = urb->transfer_buffer;
571 long ms;
572 struct timeval tv;
573 int i;
574
575 if (len != 8) {
576 printk(KERN_WARNING "%s: invalid incoming packet size (%d)\n",
577 __func__, len);
578 return;
579 }
580
581 if (debug) {
582 printk(KERN_INFO "Incoming data: ");
583 for (i = 0; i < 8; ++i)
584 printk(KERN_CONT "%02x ", buf[i]);
585 printk(KERN_CONT "\n");
586 }
587
588 /*
589 * Lirc could deal with the repeat code, but we really need to block it
590 * if it arrives too late. Otherwise we could repeat the wrong code.
591 */
592
593 /* get the time since the last button press */
594 do_gettimeofday(&tv);
595 ms = (tv.tv_sec - context->presstime.tv_sec) * 1000 +
596 (tv.tv_usec - context->presstime.tv_usec) / 1000;
597
598 if (memcmp(buf, "\x08\0\0\0\0\0\0\0", 8) == 0) {
599 /*
600 * the repeat code is being sent, so we copy
601 * the old code to LIRC
602 */
603
604 /*
605 * NOTE: Only if the last code was less than 250ms ago
606 * - no one should be able to push another (undetected) button
607 * in that time and then get a false repeat of the previous
608 * press but it is long enough for a genuine repeat
609 */
610 if ((ms < 250) && (context->codesaved != 0)) {
611 memcpy(buf, &context->lastcode, 8);
612 context->presstime.tv_sec = tv.tv_sec;
613 context->presstime.tv_usec = tv.tv_usec;
614 }
615 } else {
616 /* save the current valid code for repeats */
617 memcpy(&context->lastcode, buf, 8);
618 /*
619 * set flag to signal a valid code was save;
620 * just for safety reasons
621 */
622 context->codesaved = 1;
623 context->presstime.tv_sec = tv.tv_sec;
624 context->presstime.tv_usec = tv.tv_usec;
625 }
626
627 lirc_buffer_write(context->driver->rbuf, buf);
628 wake_up(&context->driver->rbuf->wait_poll);
629 }
630
631 /**
632 * Callback function for USB core API: receive data
633 */
usb_rx_callback(struct urb * urb)634 static void usb_rx_callback(struct urb *urb)
635 {
636 struct sasem_context *context;
637
638 if (!urb)
639 return;
640 context = (struct sasem_context *) urb->context;
641 if (!context)
642 return;
643
644 switch (urb->status) {
645
646 case -ENOENT: /* usbcore unlink successful! */
647 return;
648
649 case 0:
650 if (context->ir_isopen)
651 incoming_packet(context, urb);
652 break;
653
654 default:
655 printk(KERN_WARNING "%s: status (%d): ignored",
656 __func__, urb->status);
657 break;
658 }
659
660 usb_submit_urb(context->rx_urb, GFP_ATOMIC);
661 return;
662 }
663
664
665
666 /**
667 * Callback function for USB core API: Probe
668 */
sasem_probe(struct usb_interface * interface,const struct usb_device_id * id)669 static int sasem_probe(struct usb_interface *interface,
670 const struct usb_device_id *id)
671 {
672 struct usb_device *dev = NULL;
673 struct usb_host_interface *iface_desc = NULL;
674 struct usb_endpoint_descriptor *rx_endpoint = NULL;
675 struct usb_endpoint_descriptor *tx_endpoint = NULL;
676 struct urb *rx_urb = NULL;
677 struct urb *tx_urb = NULL;
678 struct lirc_driver *driver = NULL;
679 struct lirc_buffer *rbuf = NULL;
680 int lirc_minor = 0;
681 int num_endpoints;
682 int retval = 0;
683 int vfd_ep_found;
684 int ir_ep_found;
685 int alloc_status;
686 struct sasem_context *context = NULL;
687 int i;
688
689 printk(KERN_INFO "%s: found Sasem device\n", __func__);
690
691
692 dev = usb_get_dev(interface_to_usbdev(interface));
693 iface_desc = interface->cur_altsetting;
694 num_endpoints = iface_desc->desc.bNumEndpoints;
695
696 /*
697 * Scan the endpoint list and set:
698 * first input endpoint = IR endpoint
699 * first output endpoint = VFD endpoint
700 */
701
702 ir_ep_found = 0;
703 vfd_ep_found = 0;
704
705 for (i = 0; i < num_endpoints && !(ir_ep_found && vfd_ep_found); ++i) {
706
707 struct usb_endpoint_descriptor *ep;
708 int ep_dir;
709 int ep_type;
710 ep = &iface_desc->endpoint [i].desc;
711 ep_dir = ep->bEndpointAddress & USB_ENDPOINT_DIR_MASK;
712 ep_type = ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
713
714 if (!ir_ep_found &&
715 ep_dir == USB_DIR_IN &&
716 ep_type == USB_ENDPOINT_XFER_INT) {
717
718 rx_endpoint = ep;
719 ir_ep_found = 1;
720 if (debug)
721 printk(KERN_INFO "%s: found IR endpoint\n",
722 __func__);
723
724 } else if (!vfd_ep_found &&
725 ep_dir == USB_DIR_OUT &&
726 ep_type == USB_ENDPOINT_XFER_INT) {
727
728 tx_endpoint = ep;
729 vfd_ep_found = 1;
730 if (debug)
731 printk(KERN_INFO "%s: found VFD endpoint\n",
732 __func__);
733 }
734 }
735
736 /* Input endpoint is mandatory */
737 if (!ir_ep_found) {
738
739 err("%s: no valid input (IR) endpoint found.", __func__);
740 retval = -ENODEV;
741 goto exit;
742 }
743
744 if (!vfd_ep_found)
745 printk(KERN_INFO "%s: no valid output (VFD) endpoint found.\n",
746 __func__);
747
748
749 /* Allocate memory */
750 alloc_status = 0;
751
752 context = kzalloc(sizeof(struct sasem_context), GFP_KERNEL);
753 if (!context) {
754 err("%s: kzalloc failed for context", __func__);
755 alloc_status = 1;
756 goto alloc_status_switch;
757 }
758 driver = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL);
759 if (!driver) {
760 err("%s: kzalloc failed for lirc_driver", __func__);
761 alloc_status = 2;
762 goto alloc_status_switch;
763 }
764 rbuf = kmalloc(sizeof(struct lirc_buffer), GFP_KERNEL);
765 if (!rbuf) {
766 err("%s: kmalloc failed for lirc_buffer", __func__);
767 alloc_status = 3;
768 goto alloc_status_switch;
769 }
770 if (lirc_buffer_init(rbuf, BUF_CHUNK_SIZE, BUF_SIZE)) {
771 err("%s: lirc_buffer_init failed", __func__);
772 alloc_status = 4;
773 goto alloc_status_switch;
774 }
775 rx_urb = usb_alloc_urb(0, GFP_KERNEL);
776 if (!rx_urb) {
777 err("%s: usb_alloc_urb failed for IR urb", __func__);
778 alloc_status = 5;
779 goto alloc_status_switch;
780 }
781 if (vfd_ep_found) {
782 tx_urb = usb_alloc_urb(0, GFP_KERNEL);
783 if (!tx_urb) {
784 err("%s: usb_alloc_urb failed for VFD urb",
785 __func__);
786 alloc_status = 6;
787 goto alloc_status_switch;
788 }
789 }
790
791 mutex_init(&context->ctx_lock);
792
793 strcpy(driver->name, MOD_NAME);
794 driver->minor = -1;
795 driver->code_length = 64;
796 driver->sample_rate = 0;
797 driver->features = LIRC_CAN_REC_LIRCCODE;
798 driver->data = context;
799 driver->rbuf = rbuf;
800 driver->set_use_inc = ir_open;
801 driver->set_use_dec = ir_close;
802 driver->dev = &interface->dev;
803 driver->owner = THIS_MODULE;
804
805 mutex_lock(&context->ctx_lock);
806
807 lirc_minor = lirc_register_driver(driver);
808 if (lirc_minor < 0) {
809 err("%s: lirc_register_driver failed", __func__);
810 alloc_status = 7;
811 retval = lirc_minor;
812 goto unlock;
813 } else
814 printk(KERN_INFO "%s: Registered Sasem driver (minor:%d)\n",
815 __func__, lirc_minor);
816
817 /* Needed while unregistering! */
818 driver->minor = lirc_minor;
819
820 context->dev = dev;
821 context->dev_present = 1;
822 context->rx_endpoint = rx_endpoint;
823 context->rx_urb = rx_urb;
824 if (vfd_ep_found) {
825 context->tx_endpoint = tx_endpoint;
826 context->tx_urb = tx_urb;
827 context->vfd_contrast = 1000; /* range 0 - 1000 */
828 }
829 context->driver = driver;
830
831 usb_set_intfdata(interface, context);
832
833 if (vfd_ep_found) {
834
835 if (debug)
836 printk(KERN_INFO "Registering VFD with sysfs\n");
837 if (usb_register_dev(interface, &sasem_class))
838 /* Not a fatal error, so ignore */
839 printk(KERN_INFO "%s: could not get a minor number "
840 "for VFD\n", __func__);
841 }
842
843 printk(KERN_INFO "%s: Sasem device on usb<%d:%d> initialized\n",
844 __func__, dev->bus->busnum, dev->devnum);
845 unlock:
846 mutex_unlock(&context->ctx_lock);
847
848 alloc_status_switch:
849 switch (alloc_status) {
850
851 case 7:
852 if (vfd_ep_found)
853 usb_free_urb(tx_urb);
854 case 6:
855 usb_free_urb(rx_urb);
856 case 5:
857 lirc_buffer_free(rbuf);
858 case 4:
859 kfree(rbuf);
860 case 3:
861 kfree(driver);
862 case 2:
863 kfree(context);
864 context = NULL;
865 case 1:
866 if (retval == 0)
867 retval = -ENOMEM;
868 }
869
870 exit:
871 return retval;
872 }
873
874 /**
875 * Callback function for USB core API: disonnect
876 */
sasem_disconnect(struct usb_interface * interface)877 static void sasem_disconnect(struct usb_interface *interface)
878 {
879 struct sasem_context *context;
880
881 /* prevent races with ir_open()/vfd_open() */
882 mutex_lock(&disconnect_lock);
883
884 context = usb_get_intfdata(interface);
885 mutex_lock(&context->ctx_lock);
886
887 printk(KERN_INFO "%s: Sasem device disconnected\n", __func__);
888
889 usb_set_intfdata(interface, NULL);
890 context->dev_present = 0;
891
892 /* Stop reception */
893 usb_kill_urb(context->rx_urb);
894
895 /* Abort ongoing write */
896 if (atomic_read(&context->tx.busy)) {
897
898 usb_kill_urb(context->tx_urb);
899 wait_for_completion(&context->tx.finished);
900 }
901
902 /* De-register from lirc_dev if IR port is not open */
903 if (!context->ir_isopen)
904 deregister_from_lirc(context);
905
906 usb_deregister_dev(interface, &sasem_class);
907
908 mutex_unlock(&context->ctx_lock);
909
910 if (!context->ir_isopen && !context->vfd_isopen)
911 delete_context(context);
912
913 mutex_unlock(&disconnect_lock);
914 }
915
916 module_usb_driver(sasem_driver);
917