Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

Linux/drivers/staging/media/lirc/lirc_sasem.c

  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 
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         if (debug)
175                 pr_info("%s: context deleted\n", __func__);
176 }
177 
178 static void deregister_from_lirc(struct sasem_context *context)
179 {
180         int retval;
181         int minor = context->driver->minor;
182 
183         retval = lirc_unregister_driver(minor);
184         if (retval)
185                 pr_err("%s: unable to deregister from lirc (%d)\n",
186                        __func__, retval);
187         else
188                 pr_info("Deregistered Sasem driver (minor:%d)\n", minor);
189 
190 }
191 
192 /**
193  * Called when the VFD device (e.g. /dev/usb/lcd)
194  * is opened by the application.
195  */
196 static int vfd_open(struct inode *inode, struct file *file)
197 {
198         struct usb_interface *interface;
199         struct sasem_context *context = NULL;
200         int subminor;
201         int retval = 0;
202 
203         /* prevent races with disconnect */
204         mutex_lock(&disconnect_lock);
205 
206         subminor = iminor(inode);
207         interface = usb_find_interface(&sasem_driver, subminor);
208         if (!interface) {
209                 pr_err("%s: could not find interface for minor %d\n",
210                        __func__, subminor);
211                 retval = -ENODEV;
212                 goto exit;
213         }
214         context = usb_get_intfdata(interface);
215 
216         if (!context) {
217                 dev_err(&interface->dev,
218                         "%s: no context found for minor %d\n",
219                         __func__, subminor);
220                 retval = -ENODEV;
221                 goto exit;
222         }
223 
224         mutex_lock(&context->ctx_lock);
225 
226         if (context->vfd_isopen) {
227                 dev_err(&interface->dev,
228                         "%s: VFD port is already open", __func__);
229                 retval = -EBUSY;
230         } else {
231                 context->vfd_isopen = 1;
232                 file->private_data = context;
233                 dev_info(&interface->dev, "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                 pr_err("%s: no context for device\n", __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                 pr_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                 pr_err("%s: no context for device\n", __func__);
289                 return -ENODEV;
290         }
291 
292         mutex_lock(&context->ctx_lock);
293 
294         if (!context->vfd_isopen) {
295                 dev_err(&context->dev->dev, "%s: VFD is not open\n", __func__);
296                 retval = -EIO;
297         } else {
298                 context->vfd_isopen = 0;
299                 dev_info(&context->dev->dev, "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                 dev_err(&context->dev->dev, "%s: error submitting urb (%d)\n",
341                         __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                         dev_err(&context->dev->dev,
351                                 "%s: packet tx failed (%d)\n",
352                                 __func__, retval);
353         }
354 
355         return retval;
356 }
357 
358 /**
359  * Writes data to the VFD.  The Sasem VFD is 2x16 characters
360  * and requires data in 9 consecutive USB interrupt packets,
361  * each packet carrying 8 bytes.
362  */
363 static ssize_t vfd_write(struct file *file, const char __user *buf,
364                                 size_t n_bytes, loff_t *pos)
365 {
366         int i;
367         int retval = 0;
368         struct sasem_context *context;
369         int *data_buf = NULL;
370 
371         context = (struct sasem_context *) file->private_data;
372         if (!context) {
373                 pr_err("%s: no context for device\n", __func__);
374                 return -ENODEV;
375         }
376 
377         mutex_lock(&context->ctx_lock);
378 
379         if (!context->dev_present) {
380                 pr_err("%s: no Sasem device present\n", __func__);
381                 retval = -ENODEV;
382                 goto exit;
383         }
384 
385         if (n_bytes <= 0 || n_bytes > SASEM_DATA_BUF_SZ) {
386                 dev_err(&context->dev->dev, "%s: invalid payload size\n",
387                         __func__);
388                 retval = -EINVAL;
389                 goto exit;
390         }
391 
392         data_buf = memdup_user((void const __user *)buf, n_bytes);
393         if (IS_ERR(data_buf)) {
394                 retval = PTR_ERR(data_buf);
395                 goto exit;
396         }
397 
398         memcpy(context->tx.data_buf, data_buf, n_bytes);
399 
400         /* Pad with spaces */
401         for (i = n_bytes; i < SASEM_DATA_BUF_SZ; ++i)
402                 context->tx.data_buf[i] = ' ';
403 
404         /* Nine 8 byte packets to be sent */
405         /* NOTE: "\x07\x01\0\0\0\0\0\0" or "\x0c\0\0\0\0\0\0\0"
406          *       will clear the VFD */
407         for (i = 0; i < 9; i++) {
408                 switch (i) {
409                 case 0:
410                         memcpy(context->usb_tx_buf, "\x07\0\0\0\0\0\0\0", 8);
411                         context->usb_tx_buf[1] = (context->vfd_contrast) ?
412                                 (0x2B - (context->vfd_contrast - 1) / 250)
413                                 : 0x2B;
414                         break;
415                 case 1:
416                         memcpy(context->usb_tx_buf, "\x09\x01\0\0\0\0\0\0", 8);
417                         break;
418                 case 2:
419                         memcpy(context->usb_tx_buf, "\x0b\x01\0\0\0\0\0\0", 8);
420                         break;
421                 case 3:
422                         memcpy(context->usb_tx_buf, context->tx.data_buf, 8);
423                         break;
424                 case 4:
425                         memcpy(context->usb_tx_buf,
426                                context->tx.data_buf + 8, 8);
427                         break;
428                 case 5:
429                         memcpy(context->usb_tx_buf, "\x09\x01\0\0\0\0\0\0", 8);
430                         break;
431                 case 6:
432                         memcpy(context->usb_tx_buf, "\x0b\x02\0\0\0\0\0\0", 8);
433                         break;
434                 case 7:
435                         memcpy(context->usb_tx_buf,
436                                context->tx.data_buf + 16, 8);
437                         break;
438                 case 8:
439                         memcpy(context->usb_tx_buf,
440                                context->tx.data_buf + 24, 8);
441                         break;
442                 }
443                 retval = send_packet(context);
444                 if (retval) {
445                         dev_err(&context->dev->dev,
446                                 "%s: send packet failed for packet #%d\n",
447                                 __func__, i);
448                         goto exit;
449                 }
450         }
451 exit:
452 
453         mutex_unlock(&context->ctx_lock);
454         kfree(data_buf);
455 
456         return (!retval) ? n_bytes : retval;
457 }
458 
459 /**
460  * Callback function for USB core API: transmit data
461  */
462 static void usb_tx_callback(struct urb *urb)
463 {
464         struct sasem_context *context;
465 
466         if (!urb)
467                 return;
468         context = (struct sasem_context *) urb->context;
469         if (!context)
470                 return;
471 
472         context->tx.status = urb->status;
473 
474         /* notify waiters that write has finished */
475         atomic_set(&context->tx.busy, 0);
476         complete(&context->tx.finished);
477 
478         return;
479 }
480 
481 /**
482  * Called by lirc_dev when the application opens /dev/lirc
483  */
484 static int ir_open(void *data)
485 {
486         int retval = 0;
487         struct sasem_context *context;
488 
489         /* prevent races with disconnect */
490         mutex_lock(&disconnect_lock);
491 
492         context = (struct sasem_context *) data;
493 
494         mutex_lock(&context->ctx_lock);
495 
496         if (context->ir_isopen) {
497                 dev_err(&context->dev->dev, "%s: IR port is already open\n",
498                         __func__);
499                 retval = -EBUSY;
500                 goto exit;
501         }
502 
503         usb_fill_int_urb(context->rx_urb, context->dev,
504                 usb_rcvintpipe(context->dev,
505                                 context->rx_endpoint->bEndpointAddress),
506                 context->usb_rx_buf, sizeof(context->usb_rx_buf),
507                 usb_rx_callback, context, context->rx_endpoint->bInterval);
508 
509         retval = usb_submit_urb(context->rx_urb, GFP_KERNEL);
510 
511         if (retval)
512                 dev_err(&context->dev->dev,
513                         "%s: usb_submit_urb failed for ir_open (%d)\n",
514                         __func__, retval);
515         else {
516                 context->ir_isopen = 1;
517                 dev_info(&context->dev->dev, "IR port opened\n");
518         }
519 
520 exit:
521         mutex_unlock(&context->ctx_lock);
522 
523         mutex_unlock(&disconnect_lock);
524         return retval;
525 }
526 
527 /**
528  * Called by lirc_dev when the application closes /dev/lirc
529  */
530 static void ir_close(void *data)
531 {
532         struct sasem_context *context;
533 
534         context = (struct sasem_context *)data;
535         if (!context) {
536                 pr_err("%s: no context for device\n", __func__);
537                 return;
538         }
539 
540         mutex_lock(&context->ctx_lock);
541 
542         usb_kill_urb(context->rx_urb);
543         context->ir_isopen = 0;
544         pr_info("IR port closed\n");
545 
546         if (!context->dev_present) {
547 
548                 /*
549                  * Device disconnected while IR port was
550                  * still open. Driver was not deregistered
551                  * at disconnect time, so do it now.
552                  */
553                 deregister_from_lirc(context);
554 
555                 if (!context->vfd_isopen) {
556 
557                         mutex_unlock(&context->ctx_lock);
558                         delete_context(context);
559                         return;
560                 }
561                 /* If VFD port is open, context will be deleted by vfd_close */
562         }
563 
564         mutex_unlock(&context->ctx_lock);
565         return;
566 }
567 
568 /**
569  * Process the incoming packet
570  */
571 static void incoming_packet(struct sasem_context *context,
572                                    struct urb *urb)
573 {
574         int len = urb->actual_length;
575         unsigned char *buf = urb->transfer_buffer;
576         long ms;
577         struct timeval tv;
578         int i;
579 
580         if (len != 8) {
581                 dev_warn(&context->dev->dev,
582                          "%s: invalid incoming packet size (%d)\n",
583                          __func__, len);
584                 return;
585         }
586 
587         if (debug) {
588                 printk(KERN_INFO "Incoming data: ");
589                 for (i = 0; i < 8; ++i)
590                         printk(KERN_CONT "%02x ", buf[i]);
591                 printk(KERN_CONT "\n");
592         }
593 
594         /*
595          * Lirc could deal with the repeat code, but we really need to block it
596          * if it arrives too late.  Otherwise we could repeat the wrong code.
597          */
598 
599         /* get the time since the last button press */
600         do_gettimeofday(&tv);
601         ms = (tv.tv_sec - context->presstime.tv_sec) * 1000 +
602              (tv.tv_usec - context->presstime.tv_usec) / 1000;
603 
604         if (memcmp(buf, "\x08\0\0\0\0\0\0\0", 8) == 0) {
605                 /*
606                  * the repeat code is being sent, so we copy
607                  * the old code to LIRC
608                  */
609 
610                 /*
611                  * NOTE: Only if the last code was less than 250ms ago
612                  * - no one should be able to push another (undetected) button
613                  *   in that time and then get a false repeat of the previous
614                  *   press but it is long enough for a genuine repeat
615                  */
616                 if ((ms < 250) && (context->codesaved != 0)) {
617                         memcpy(buf, &context->lastcode, 8);
618                         context->presstime.tv_sec = tv.tv_sec;
619                         context->presstime.tv_usec = tv.tv_usec;
620                 }
621         } else {
622                 /* save the current valid code for repeats */
623                 memcpy(&context->lastcode, buf, 8);
624                 /*
625                  * set flag to signal a valid code was save;
626                  * just for safety reasons
627                  */
628                 context->codesaved = 1;
629                 context->presstime.tv_sec = tv.tv_sec;
630                 context->presstime.tv_usec = tv.tv_usec;
631         }
632 
633         lirc_buffer_write(context->driver->rbuf, buf);
634         wake_up(&context->driver->rbuf->wait_poll);
635 }
636 
637 /**
638  * Callback function for USB core API: receive data
639  */
640 static void usb_rx_callback(struct urb *urb)
641 {
642         struct sasem_context *context;
643 
644         if (!urb)
645                 return;
646         context = (struct sasem_context *) urb->context;
647         if (!context)
648                 return;
649 
650         switch (urb->status) {
651 
652         case -ENOENT:           /* usbcore unlink successful! */
653                 return;
654 
655         case 0:
656                 if (context->ir_isopen)
657                         incoming_packet(context, urb);
658                 break;
659 
660         default:
661                 dev_warn(&urb->dev->dev, "%s: status (%d): ignored",
662                          __func__, urb->status);
663                 break;
664         }
665 
666         usb_submit_urb(context->rx_urb, GFP_ATOMIC);
667         return;
668 }
669 
670 
671 
672 /**
673  * Callback function for USB core API: Probe
674  */
675 static int sasem_probe(struct usb_interface *interface,
676                         const struct usb_device_id *id)
677 {
678         struct usb_device *dev = NULL;
679         struct usb_host_interface *iface_desc = NULL;
680         struct usb_endpoint_descriptor *rx_endpoint = NULL;
681         struct usb_endpoint_descriptor *tx_endpoint = NULL;
682         struct urb *rx_urb = NULL;
683         struct urb *tx_urb = NULL;
684         struct lirc_driver *driver = NULL;
685         struct lirc_buffer *rbuf = NULL;
686         int lirc_minor = 0;
687         int num_endpoints;
688         int retval = 0;
689         int vfd_ep_found;
690         int ir_ep_found;
691         int alloc_status;
692         struct sasem_context *context = NULL;
693         int i;
694 
695         dev_info(&interface->dev, "%s: found Sasem device\n", __func__);
696 
697 
698         dev = usb_get_dev(interface_to_usbdev(interface));
699         iface_desc = interface->cur_altsetting;
700         num_endpoints = iface_desc->desc.bNumEndpoints;
701 
702         /*
703          * Scan the endpoint list and set:
704          *      first input endpoint = IR endpoint
705          *      first output endpoint = VFD endpoint
706          */
707 
708         ir_ep_found = 0;
709         vfd_ep_found = 0;
710 
711         for (i = 0; i < num_endpoints && !(ir_ep_found && vfd_ep_found); ++i) {
712 
713                 struct usb_endpoint_descriptor *ep;
714                 int ep_dir;
715                 int ep_type;
716                 ep = &iface_desc->endpoint [i].desc;
717                 ep_dir = ep->bEndpointAddress & USB_ENDPOINT_DIR_MASK;
718                 ep_type = ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
719 
720                 if (!ir_ep_found &&
721                         ep_dir == USB_DIR_IN &&
722                         ep_type == USB_ENDPOINT_XFER_INT) {
723 
724                         rx_endpoint = ep;
725                         ir_ep_found = 1;
726                         if (debug)
727                                 dev_info(&interface->dev,
728                                         "%s: found IR endpoint\n", __func__);
729 
730                 } else if (!vfd_ep_found &&
731                         ep_dir == USB_DIR_OUT &&
732                         ep_type == USB_ENDPOINT_XFER_INT) {
733 
734                         tx_endpoint = ep;
735                         vfd_ep_found = 1;
736                         if (debug)
737                                 dev_info(&interface->dev,
738                                         "%s: found VFD endpoint\n", __func__);
739                 }
740         }
741 
742         /* Input endpoint is mandatory */
743         if (!ir_ep_found) {
744                 dev_err(&interface->dev,
745                         "%s: no valid input (IR) endpoint found.\n", __func__);
746                 retval = -ENODEV;
747                 goto exit;
748         }
749 
750         if (!vfd_ep_found)
751                 dev_info(&interface->dev,
752                         "%s: no valid output (VFD) endpoint found.\n",
753                         __func__);
754 
755 
756         /* Allocate memory */
757         alloc_status = 0;
758 
759         context = kzalloc(sizeof(struct sasem_context), GFP_KERNEL);
760         if (!context) {
761                 alloc_status = 1;
762                 goto alloc_status_switch;
763         }
764         driver = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL);
765         if (!driver) {
766                 alloc_status = 2;
767                 goto alloc_status_switch;
768         }
769         rbuf = kmalloc(sizeof(struct lirc_buffer), GFP_KERNEL);
770         if (!rbuf) {
771                 alloc_status = 3;
772                 goto alloc_status_switch;
773         }
774         if (lirc_buffer_init(rbuf, BUF_CHUNK_SIZE, BUF_SIZE)) {
775                 dev_err(&interface->dev,
776                         "%s: lirc_buffer_init failed\n", __func__);
777                 alloc_status = 4;
778                 goto alloc_status_switch;
779         }
780         rx_urb = usb_alloc_urb(0, GFP_KERNEL);
781         if (!rx_urb) {
782                 dev_err(&interface->dev,
783                         "%s: usb_alloc_urb failed for IR urb\n", __func__);
784                 alloc_status = 5;
785                 goto alloc_status_switch;
786         }
787         if (vfd_ep_found) {
788                 tx_urb = usb_alloc_urb(0, GFP_KERNEL);
789                 if (!tx_urb) {
790                         dev_err(&interface->dev,
791                                 "%s: usb_alloc_urb failed for VFD urb",
792                                 __func__);
793                         alloc_status = 6;
794                         goto alloc_status_switch;
795                 }
796         }
797 
798         mutex_init(&context->ctx_lock);
799 
800         strcpy(driver->name, MOD_NAME);
801         driver->minor = -1;
802         driver->code_length = 64;
803         driver->sample_rate = 0;
804         driver->features = LIRC_CAN_REC_LIRCCODE;
805         driver->data = context;
806         driver->rbuf = rbuf;
807         driver->set_use_inc = ir_open;
808         driver->set_use_dec = ir_close;
809         driver->dev   = &interface->dev;
810         driver->owner = THIS_MODULE;
811 
812         mutex_lock(&context->ctx_lock);
813 
814         lirc_minor = lirc_register_driver(driver);
815         if (lirc_minor < 0) {
816                 dev_err(&interface->dev,
817                         "%s: lirc_register_driver failed\n", __func__);
818                 alloc_status = 7;
819                 retval = lirc_minor;
820                 goto unlock;
821         } else
822                 dev_info(&interface->dev,
823                          "%s: Registered Sasem driver (minor:%d)\n",
824                          __func__, lirc_minor);
825 
826         /* Needed while unregistering! */
827         driver->minor = lirc_minor;
828 
829         context->dev = dev;
830         context->dev_present = 1;
831         context->rx_endpoint = rx_endpoint;
832         context->rx_urb = rx_urb;
833         if (vfd_ep_found) {
834                 context->tx_endpoint = tx_endpoint;
835                 context->tx_urb = tx_urb;
836                 context->vfd_contrast = 1000;   /* range 0 - 1000 */
837         }
838         context->driver = driver;
839 
840         usb_set_intfdata(interface, context);
841 
842         if (vfd_ep_found) {
843 
844                 if (debug)
845                         dev_info(&interface->dev,
846                                  "Registering VFD with sysfs\n");
847                 if (usb_register_dev(interface, &sasem_class))
848                         /* Not a fatal error, so ignore */
849                         dev_info(&interface->dev,
850                                  "%s: could not get a minor number for VFD\n",
851                                  __func__);
852         }
853 
854         dev_info(&interface->dev,
855                  "%s: Sasem device on usb<%d:%d> initialized\n",
856                  __func__, dev->bus->busnum, dev->devnum);
857 unlock:
858         mutex_unlock(&context->ctx_lock);
859 
860 alloc_status_switch:
861         switch (alloc_status) {
862 
863         case 7:
864                 if (vfd_ep_found)
865                         usb_free_urb(tx_urb);
866         case 6:
867                 usb_free_urb(rx_urb);
868                 /* fall-through */
869         case 5:
870                 lirc_buffer_free(rbuf);
871                 /* fall-through */
872         case 4:
873                 kfree(rbuf);
874                 /* fall-through */
875         case 3:
876                 kfree(driver);
877                 /* fall-through */
878         case 2:
879                 kfree(context);
880                 context = NULL;
881                 /* fall-through */
882         case 1:
883                 if (retval == 0)
884                         retval = -ENOMEM;
885         }
886 
887 exit:
888         return retval;
889 }
890 
891 /**
892  * Callback function for USB core API: disconnect
893  */
894 static void sasem_disconnect(struct usb_interface *interface)
895 {
896         struct sasem_context *context;
897 
898         /* prevent races with ir_open()/vfd_open() */
899         mutex_lock(&disconnect_lock);
900 
901         context = usb_get_intfdata(interface);
902         mutex_lock(&context->ctx_lock);
903 
904         dev_info(&interface->dev, "%s: Sasem device disconnected\n",
905                  __func__);
906 
907         usb_set_intfdata(interface, NULL);
908         context->dev_present = 0;
909 
910         /* Stop reception */
911         usb_kill_urb(context->rx_urb);
912 
913         /* Abort ongoing write */
914         if (atomic_read(&context->tx.busy)) {
915 
916                 usb_kill_urb(context->tx_urb);
917                 wait_for_completion(&context->tx.finished);
918         }
919 
920         /* De-register from lirc_dev if IR port is not open */
921         if (!context->ir_isopen)
922                 deregister_from_lirc(context);
923 
924         usb_deregister_dev(interface, &sasem_class);
925 
926         mutex_unlock(&context->ctx_lock);
927 
928         if (!context->ir_isopen && !context->vfd_isopen)
929                 delete_context(context);
930 
931         mutex_unlock(&disconnect_lock);
932 }
933 
934 module_usb_driver(sasem_driver);
935 

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