Version:  2.0.40 2.2.26 2.4.37 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2

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 
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  */
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  */
245 static long vfd_ioctl(struct file *file, unsigned cmd, unsigned long arg)
246 {
247         struct sasem_context *context = NULL;
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  */
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  */
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  */
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  */
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  */
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  */
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  */
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  */
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  */
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                 int ep_dir;
701                 int ep_type;
702 
703                 ep = &iface_desc->endpoint [i].desc;
704                 ep_dir = ep->bEndpointAddress & USB_ENDPOINT_DIR_MASK;
705                 ep_type = ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
706 
707                 if (!ir_ep_found &&
708                         ep_dir == USB_DIR_IN &&
709                         ep_type == USB_ENDPOINT_XFER_INT) {
710 
711                         rx_endpoint = ep;
712                         ir_ep_found = 1;
713                         if (debug)
714                                 dev_info(&interface->dev,
715                                         "%s: found IR endpoint\n", __func__);
716 
717                 } else if (!vfd_ep_found &&
718                         ep_dir == USB_DIR_OUT &&
719                         ep_type == USB_ENDPOINT_XFER_INT) {
720 
721                         tx_endpoint = ep;
722                         vfd_ep_found = 1;
723                         if (debug)
724                                 dev_info(&interface->dev,
725                                         "%s: found VFD endpoint\n", __func__);
726                 }
727         }
728 
729         /* Input endpoint is mandatory */
730         if (!ir_ep_found) {
731                 dev_err(&interface->dev,
732                         "%s: no valid input (IR) endpoint found.\n", __func__);
733                 retval = -ENODEV;
734                 goto exit;
735         }
736 
737         if (!vfd_ep_found)
738                 dev_info(&interface->dev,
739                         "%s: no valid output (VFD) endpoint found.\n",
740                         __func__);
741 
742 
743         /* Allocate memory */
744         alloc_status = 0;
745 
746         context = kzalloc(sizeof(struct sasem_context), GFP_KERNEL);
747         if (!context) {
748                 alloc_status = 1;
749                 goto alloc_status_switch;
750         }
751         driver = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL);
752         if (!driver) {
753                 alloc_status = 2;
754                 goto alloc_status_switch;
755         }
756         rbuf = kmalloc(sizeof(struct lirc_buffer), GFP_KERNEL);
757         if (!rbuf) {
758                 alloc_status = 3;
759                 goto alloc_status_switch;
760         }
761         if (lirc_buffer_init(rbuf, BUF_CHUNK_SIZE, BUF_SIZE)) {
762                 dev_err(&interface->dev,
763                         "%s: lirc_buffer_init failed\n", __func__);
764                 alloc_status = 4;
765                 goto alloc_status_switch;
766         }
767         rx_urb = usb_alloc_urb(0, GFP_KERNEL);
768         if (!rx_urb) {
769                 dev_err(&interface->dev,
770                         "%s: usb_alloc_urb failed for IR urb\n", __func__);
771                 alloc_status = 5;
772                 goto alloc_status_switch;
773         }
774         if (vfd_ep_found) {
775                 tx_urb = usb_alloc_urb(0, GFP_KERNEL);
776                 if (!tx_urb) {
777                         dev_err(&interface->dev,
778                                 "%s: usb_alloc_urb failed for VFD urb",
779                                 __func__);
780                         alloc_status = 6;
781                         goto alloc_status_switch;
782                 }
783         }
784 
785         mutex_init(&context->ctx_lock);
786 
787         strcpy(driver->name, MOD_NAME);
788         driver->minor = -1;
789         driver->code_length = 64;
790         driver->sample_rate = 0;
791         driver->features = LIRC_CAN_REC_LIRCCODE;
792         driver->data = context;
793         driver->rbuf = rbuf;
794         driver->set_use_inc = ir_open;
795         driver->set_use_dec = ir_close;
796         driver->dev   = &interface->dev;
797         driver->owner = THIS_MODULE;
798 
799         mutex_lock(&context->ctx_lock);
800 
801         lirc_minor = lirc_register_driver(driver);
802         if (lirc_minor < 0) {
803                 dev_err(&interface->dev,
804                         "%s: lirc_register_driver failed\n", __func__);
805                 alloc_status = 7;
806                 retval = lirc_minor;
807                 goto unlock;
808         } else
809                 dev_info(&interface->dev,
810                          "%s: Registered Sasem driver (minor:%d)\n",
811                          __func__, lirc_minor);
812 
813         /* Needed while unregistering! */
814         driver->minor = lirc_minor;
815 
816         context->dev = dev;
817         context->dev_present = 1;
818         context->rx_endpoint = rx_endpoint;
819         context->rx_urb = rx_urb;
820         if (vfd_ep_found) {
821                 context->tx_endpoint = tx_endpoint;
822                 context->tx_urb = tx_urb;
823                 context->vfd_contrast = 1000;   /* range 0 - 1000 */
824         }
825         context->driver = driver;
826 
827         usb_set_intfdata(interface, context);
828 
829         if (vfd_ep_found) {
830 
831                 if (debug)
832                         dev_info(&interface->dev,
833                                  "Registering VFD with sysfs\n");
834                 if (usb_register_dev(interface, &sasem_class))
835                         /* Not a fatal error, so ignore */
836                         dev_info(&interface->dev,
837                                  "%s: could not get a minor number for VFD\n",
838                                  __func__);
839         }
840 
841         dev_info(&interface->dev,
842                  "%s: Sasem device on usb<%d:%d> initialized\n",
843                  __func__, dev->bus->busnum, dev->devnum);
844 unlock:
845         mutex_unlock(&context->ctx_lock);
846 
847 alloc_status_switch:
848         switch (alloc_status) {
849 
850         case 7:
851                 if (vfd_ep_found)
852                         usb_free_urb(tx_urb);
853         case 6:
854                 usb_free_urb(rx_urb);
855                 /* fall-through */
856         case 5:
857                 lirc_buffer_free(rbuf);
858                 /* fall-through */
859         case 4:
860                 kfree(rbuf);
861                 /* fall-through */
862         case 3:
863                 kfree(driver);
864                 /* fall-through */
865         case 2:
866                 kfree(context);
867                 context = NULL;
868                 /* fall-through */
869         case 1:
870                 if (retval == 0)
871                         retval = -ENOMEM;
872         }
873 
874 exit:
875         return retval;
876 }
877 
878 /**
879  * Callback function for USB core API: disconnect
880  */
881 static void sasem_disconnect(struct usb_interface *interface)
882 {
883         struct sasem_context *context;
884 
885         /* prevent races with ir_open()/vfd_open() */
886         mutex_lock(&disconnect_lock);
887 
888         context = usb_get_intfdata(interface);
889         mutex_lock(&context->ctx_lock);
890 
891         dev_info(&interface->dev, "%s: Sasem device disconnected\n",
892                  __func__);
893 
894         usb_set_intfdata(interface, NULL);
895         context->dev_present = 0;
896 
897         /* Stop reception */
898         usb_kill_urb(context->rx_urb);
899 
900         /* Abort ongoing write */
901         if (atomic_read(&context->tx.busy)) {
902 
903                 usb_kill_urb(context->tx_urb);
904                 wait_for_completion(&context->tx.finished);
905         }
906 
907         /* De-register from lirc_dev if IR port is not open */
908         if (!context->ir_isopen)
909                 deregister_from_lirc(context);
910 
911         usb_deregister_dev(interface, &sasem_class);
912 
913         mutex_unlock(&context->ctx_lock);
914 
915         if (!context->ir_isopen && !context->vfd_isopen)
916                 delete_context(context);
917 
918         mutex_unlock(&disconnect_lock);
919 }
920 
921 module_usb_driver(sasem_driver);
922 

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