Version:  2.0.40 2.2.26 2.4.37 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 4.3 4.4 4.5 4.6 4.7

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 #include <linux/ktime.h>
 46 
 47 #include <media/lirc.h>
 48 #include <media/lirc_dev.h>
 49 
 50 
 51 #define MOD_AUTHOR      "Oliver Stabel <oliver.stabel@gmx.de>, " \
 52                         "Tim Davies <tim@opensystems.net.au>"
 53 #define MOD_DESC        "USB Driver for Sasem Remote Controller V1.1"
 54 #define MOD_NAME        "lirc_sasem"
 55 #define MOD_VERSION     "0.5"
 56 
 57 #define VFD_MINOR_BASE  144     /* Same as LCD */
 58 #define DEVICE_NAME     "lcd%d"
 59 
 60 #define BUF_CHUNK_SIZE  8
 61 #define BUF_SIZE        128
 62 
 63 #define IOCTL_LCD_CONTRAST 1
 64 
 65 /*** P R O T O T Y P E S ***/
 66 
 67 /* USB Callback prototypes */
 68 static int sasem_probe(struct usb_interface *interface,
 69                         const struct usb_device_id *id);
 70 static void sasem_disconnect(struct usb_interface *interface);
 71 static void usb_rx_callback(struct urb *urb);
 72 static void usb_tx_callback(struct urb *urb);
 73 
 74 /* VFD file_operations function prototypes */
 75 static int vfd_open(struct inode *inode, struct file *file);
 76 static long vfd_ioctl(struct file *file, unsigned cmd, unsigned long arg);
 77 static int vfd_close(struct inode *inode, struct file *file);
 78 static ssize_t vfd_write(struct file *file, const char __user *buf,
 79                                 size_t n_bytes, loff_t *pos);
 80 
 81 /* LIRC driver function prototypes */
 82 static int ir_open(void *data);
 83 static void ir_close(void *data);
 84 
 85 /*** G L O B A L S ***/
 86 #define SASEM_DATA_BUF_SZ       32
 87 
 88 struct sasem_context {
 89 
 90         struct usb_device *dev;
 91         int vfd_isopen;                 /* VFD port has been opened */
 92         unsigned int vfd_contrast;      /* VFD contrast */
 93         int ir_isopen;                  /* IR port has been opened */
 94         int dev_present;                /* USB device presence */
 95         struct mutex ctx_lock;          /* to lock this object */
 96         wait_queue_head_t remove_ok;    /* For unexpected USB disconnects */
 97 
 98         struct lirc_driver *driver;
 99         struct usb_endpoint_descriptor *rx_endpoint;
100         struct usb_endpoint_descriptor *tx_endpoint;
101         struct urb *rx_urb;
102         struct urb *tx_urb;
103         unsigned char usb_rx_buf[8];
104         unsigned char usb_tx_buf[8];
105 
106         struct tx_t {
107                 unsigned char data_buf[SASEM_DATA_BUF_SZ]; /* user data
108                                                             * buffer */
109                 struct completion finished;  /* wait for write to finish  */
110                 atomic_t busy;               /* write in progress */
111                 int status;                  /* status of tx completion */
112         } tx;
113 
114         /* for dealing with repeat codes (wish there was a toggle bit!) */
115         ktime_t presstime;
116         char lastcode[8];
117         int codesaved;
118 };
119 
120 /* VFD file operations */
121 static const struct file_operations vfd_fops = {
122         .owner          = THIS_MODULE,
123         .open           = &vfd_open,
124         .write          = vfd_write,
125         .unlocked_ioctl = &vfd_ioctl,
126         .release        = &vfd_close,
127         .llseek         = noop_llseek,
128 };
129 
130 /* USB Device ID for Sasem USB Control Board */
131 static struct usb_device_id sasem_usb_id_table[] = {
132         /* Sasem USB Control Board */
133         { USB_DEVICE(0x11ba, 0x0101) },
134         /* Terminating entry */
135         {}
136 };
137 
138 /* USB Device data */
139 static struct usb_driver sasem_driver = {
140         .name           = MOD_NAME,
141         .probe          = sasem_probe,
142         .disconnect     = sasem_disconnect,
143         .id_table       = sasem_usb_id_table,
144 };
145 
146 static struct usb_class_driver sasem_class = {
147         .name           = DEVICE_NAME,
148         .fops           = &vfd_fops,
149         .minor_base     = VFD_MINOR_BASE,
150 };
151 
152 /* to prevent races between open() and disconnect() */
153 static DEFINE_MUTEX(disconnect_lock);
154 
155 static int debug;
156 
157 
158 /*** M O D U L E   C O D E ***/
159 
160 MODULE_AUTHOR(MOD_AUTHOR);
161 MODULE_DESCRIPTION(MOD_DESC);
162 MODULE_LICENSE("GPL");
163 module_param(debug, int, S_IRUGO | S_IWUSR);
164 MODULE_PARM_DESC(debug, "Debug messages: 0=no, 1=yes (default: no)");
165 
166 static void delete_context(struct sasem_context *context)
167 {
168         usb_free_urb(context->tx_urb);  /* VFD */
169         usb_free_urb(context->rx_urb);  /* IR */
170         lirc_buffer_free(context->driver->rbuf);
171         kfree(context->driver->rbuf);
172         kfree(context->driver);
173         kfree(context);
174 }
175 
176 static void deregister_from_lirc(struct sasem_context *context)
177 {
178         int retval;
179         int minor = context->driver->minor;
180 
181         retval = lirc_unregister_driver(minor);
182         if (retval)
183                 dev_err(&context->dev->dev,
184                         "%s: unable to deregister from lirc (%d)\n",
185                         __func__, retval);
186         else
187                 dev_info(&context->dev->dev,
188                          "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, "no context found for minor %d\n",
218                         subminor);
219                 retval = -ENODEV;
220                 goto exit;
221         }
222 
223         mutex_lock(&context->ctx_lock);
224 
225         if (context->vfd_isopen) {
226                 dev_err(&interface->dev,
227                         "%s: VFD port is already open", __func__);
228                 retval = -EBUSY;
229         } else {
230                 context->vfd_isopen = 1;
231                 file->private_data = context;
232                 dev_info(&interface->dev, "VFD port opened\n");
233         }
234 
235         mutex_unlock(&context->ctx_lock);
236 
237 exit:
238         mutex_unlock(&disconnect_lock);
239         return retval;
240 }
241 
242 /**
243  * Called when the VFD device (e.g. /dev/usb/lcd)
244  * is closed by the application.
245  */
246 static long vfd_ioctl(struct file *file, unsigned cmd, unsigned long arg)
247 {
248         struct sasem_context *context;
249 
250         context = (struct sasem_context *) file->private_data;
251 
252         if (!context) {
253                 pr_err("%s: no context for device\n", __func__);
254                 return -ENODEV;
255         }
256 
257         mutex_lock(&context->ctx_lock);
258 
259         switch (cmd) {
260         case IOCTL_LCD_CONTRAST:
261                 if (arg > 1000)
262                         arg = 1000;
263                 context->vfd_contrast = (unsigned int)arg;
264                 break;
265         default:
266                 pr_info("Unknown IOCTL command\n");
267                 mutex_unlock(&context->ctx_lock);
268                 return -ENOIOCTLCMD;  /* not supported */
269         }
270 
271         mutex_unlock(&context->ctx_lock);
272         return 0;
273 }
274 
275 /**
276  * Called when the VFD device (e.g. /dev/usb/lcd)
277  * is closed by the application.
278  */
279 static int vfd_close(struct inode *inode, struct file *file)
280 {
281         struct sasem_context *context = NULL;
282         int retval = 0;
283 
284         context = (struct sasem_context *) file->private_data;
285 
286         if (!context) {
287                 pr_err("%s: no context for device\n", __func__);
288                 return -ENODEV;
289         }
290 
291         mutex_lock(&context->ctx_lock);
292 
293         if (!context->vfd_isopen) {
294                 dev_err(&context->dev->dev, "%s: VFD is not open\n", __func__);
295                 retval = -EIO;
296         } else {
297                 context->vfd_isopen = 0;
298                 dev_info(&context->dev->dev, "VFD port closed\n");
299                 if (!context->dev_present && !context->ir_isopen) {
300 
301                         /* Device disconnected before close and IR port is
302                          * not open. If IR port is open, context will be
303                          * deleted by ir_close. */
304                         mutex_unlock(&context->ctx_lock);
305                         delete_context(context);
306                         return retval;
307                 }
308         }
309 
310         mutex_unlock(&context->ctx_lock);
311         return retval;
312 }
313 
314 /**
315  * Sends a packet to the VFD.
316  */
317 static int send_packet(struct sasem_context *context)
318 {
319         unsigned int pipe;
320         int interval = 0;
321         int retval = 0;
322 
323         pipe = usb_sndintpipe(context->dev,
324                         context->tx_endpoint->bEndpointAddress);
325         interval = context->tx_endpoint->bInterval;
326 
327         usb_fill_int_urb(context->tx_urb, context->dev, pipe,
328                 context->usb_tx_buf, sizeof(context->usb_tx_buf),
329                 usb_tx_callback, context, interval);
330 
331         context->tx_urb->actual_length = 0;
332 
333         init_completion(&context->tx.finished);
334         atomic_set(&context->tx.busy, 1);
335 
336         retval =  usb_submit_urb(context->tx_urb, GFP_KERNEL);
337         if (retval) {
338                 atomic_set(&context->tx.busy, 0);
339                 dev_err(&context->dev->dev, "error submitting urb (%d)\n",
340                         retval);
341         } else {
342                 /* Wait for transmission to complete (or abort) */
343                 mutex_unlock(&context->ctx_lock);
344                 wait_for_completion(&context->tx.finished);
345                 mutex_lock(&context->ctx_lock);
346 
347                 retval = context->tx.status;
348                 if (retval)
349                         dev_err(&context->dev->dev,
350                                 "packet tx failed (%d)\n", 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  */
361 static ssize_t vfd_write(struct file *file, const char __user *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                 pr_err("%s: no context for device\n", __func__);
372                 return -ENODEV;
373         }
374 
375         mutex_lock(&context->ctx_lock);
376 
377         if (!context->dev_present) {
378                 pr_err("%s: no Sasem device present\n", __func__);
379                 retval = -ENODEV;
380                 goto exit;
381         }
382 
383         if (n_bytes <= 0 || n_bytes > SASEM_DATA_BUF_SZ) {
384                 dev_err(&context->dev->dev, "%s: invalid payload size\n",
385                         __func__);
386                 retval = -EINVAL;
387                 goto exit;
388         }
389 
390         data_buf = memdup_user(buf, n_bytes);
391         if (IS_ERR(data_buf)) {
392                 retval = PTR_ERR(data_buf);
393                 data_buf = NULL;
394                 goto exit;
395         }
396 
397         memcpy(context->tx.data_buf, data_buf, n_bytes);
398 
399         /* Pad with spaces */
400         for (i = n_bytes; i < SASEM_DATA_BUF_SZ; ++i)
401                 context->tx.data_buf[i] = ' ';
402 
403         /* Nine 8 byte packets to be sent */
404         /* NOTE: "\x07\x01\0\0\0\0\0\0" or "\x0c\0\0\0\0\0\0\0"
405          *       will clear the VFD */
406         for (i = 0; i < 9; i++) {
407                 switch (i) {
408                 case 0:
409                         memcpy(context->usb_tx_buf, "\x07\0\0\0\0\0\0\0", 8);
410                         context->usb_tx_buf[1] = (context->vfd_contrast) ?
411                                 (0x2B - (context->vfd_contrast - 1) / 250)
412                                 : 0x2B;
413                         break;
414                 case 1:
415                         memcpy(context->usb_tx_buf, "\x09\x01\0\0\0\0\0\0", 8);
416                         break;
417                 case 2:
418                         memcpy(context->usb_tx_buf, "\x0b\x01\0\0\0\0\0\0", 8);
419                         break;
420                 case 3:
421                         memcpy(context->usb_tx_buf, context->tx.data_buf, 8);
422                         break;
423                 case 4:
424                         memcpy(context->usb_tx_buf,
425                                context->tx.data_buf + 8, 8);
426                         break;
427                 case 5:
428                         memcpy(context->usb_tx_buf, "\x09\x01\0\0\0\0\0\0", 8);
429                         break;
430                 case 6:
431                         memcpy(context->usb_tx_buf, "\x0b\x02\0\0\0\0\0\0", 8);
432                         break;
433                 case 7:
434                         memcpy(context->usb_tx_buf,
435                                context->tx.data_buf + 16, 8);
436                         break;
437                 case 8:
438                         memcpy(context->usb_tx_buf,
439                                context->tx.data_buf + 24, 8);
440                         break;
441                 }
442                 retval = send_packet(context);
443                 if (retval) {
444                         dev_err(&context->dev->dev,
445                                 "send packet failed for packet #%d\n", i);
446                         goto exit;
447                 }
448         }
449 exit:
450 
451         mutex_unlock(&context->ctx_lock);
452         kfree(data_buf);
453 
454         return (!retval) ? n_bytes : retval;
455 }
456 
457 /**
458  * Callback function for USB core API: transmit data
459  */
460 static void usb_tx_callback(struct urb *urb)
461 {
462         struct sasem_context *context;
463 
464         if (!urb)
465                 return;
466         context = (struct sasem_context *) urb->context;
467         if (!context)
468                 return;
469 
470         context->tx.status = urb->status;
471 
472         /* notify waiters that write has finished */
473         atomic_set(&context->tx.busy, 0);
474         complete(&context->tx.finished);
475 }
476 
477 /**
478  * Called by lirc_dev when the application opens /dev/lirc
479  */
480 static int ir_open(void *data)
481 {
482         int retval = 0;
483         struct sasem_context *context;
484 
485         /* prevent races with disconnect */
486         mutex_lock(&disconnect_lock);
487 
488         context = data;
489 
490         mutex_lock(&context->ctx_lock);
491 
492         if (context->ir_isopen) {
493                 dev_err(&context->dev->dev, "%s: IR port is already open\n",
494                         __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                 dev_err(&context->dev->dev,
509                         "usb_submit_urb failed for ir_open (%d)\n", retval);
510         else {
511                 context->ir_isopen = 1;
512                 dev_info(&context->dev->dev, "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  */
525 static void ir_close(void *data)
526 {
527         struct sasem_context *context;
528 
529         context = data;
530         if (!context) {
531                 pr_err("%s: no context for device\n", __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         pr_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 }
561 
562 /**
563  * Process the incoming packet
564  */
565 static void incoming_packet(struct sasem_context *context,
566                                    struct urb *urb)
567 {
568         int len = urb->actual_length;
569         unsigned char *buf = urb->transfer_buffer;
570         u64 ns;
571         ktime_t kt;
572 
573         if (len != 8) {
574                 dev_warn(&context->dev->dev,
575                          "%s: invalid incoming packet size (%d)\n",
576                          __func__, len);
577                 return;
578         }
579 
580         if (debug)
581                 dev_info(&context->dev->dev, "Incoming data: %*ph\n", len, buf);
582         /*
583          * Lirc could deal with the repeat code, but we really need to block it
584          * if it arrives too late.  Otherwise we could repeat the wrong code.
585          */
586 
587         /* get the time since the last button press */
588         kt = ktime_get();
589         ns = ktime_to_ns(ktime_sub(kt, context->presstime));
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 ((ns < 250 * NSEC_PER_MSEC) && (context->codesaved != 0)) {
604                         memcpy(buf, &context->lastcode, 8);
605                         context->presstime = kt;
606                 }
607         } else {
608                 /* save the current valid code for repeats */
609                 memcpy(&context->lastcode, buf, 8);
610                 /*
611                  * set flag to signal a valid code was save;
612                  * just for safety reasons
613                  */
614                 context->codesaved = 1;
615                 context->presstime = kt;
616         }
617 
618         lirc_buffer_write(context->driver->rbuf, buf);
619         wake_up(&context->driver->rbuf->wait_poll);
620 }
621 
622 /**
623  * Callback function for USB core API: receive data
624  */
625 static void usb_rx_callback(struct urb *urb)
626 {
627         struct sasem_context *context;
628 
629         if (!urb)
630                 return;
631         context = (struct sasem_context *) urb->context;
632         if (!context)
633                 return;
634 
635         switch (urb->status) {
636 
637         case -ENOENT:           /* usbcore unlink successful! */
638                 return;
639 
640         case 0:
641                 if (context->ir_isopen)
642                         incoming_packet(context, urb);
643                 break;
644 
645         default:
646                 dev_warn(&urb->dev->dev, "%s: status (%d): ignored",
647                          __func__, urb->status);
648                 break;
649         }
650 
651         usb_submit_urb(context->rx_urb, GFP_ATOMIC);
652 }
653 
654 
655 
656 /**
657  * Callback function for USB core API: Probe
658  */
659 static int sasem_probe(struct usb_interface *interface,
660                         const struct usb_device_id *id)
661 {
662         struct usb_device *dev = NULL;
663         struct usb_host_interface *iface_desc = NULL;
664         struct usb_endpoint_descriptor *rx_endpoint = NULL;
665         struct usb_endpoint_descriptor *tx_endpoint = NULL;
666         struct urb *rx_urb = NULL;
667         struct urb *tx_urb = NULL;
668         struct lirc_driver *driver = NULL;
669         struct lirc_buffer *rbuf = NULL;
670         int lirc_minor = 0;
671         int num_endpoints;
672         int retval = 0;
673         int vfd_ep_found;
674         int ir_ep_found;
675         int alloc_status;
676         struct sasem_context *context = NULL;
677         int i;
678 
679         dev_info(&interface->dev, "%s: found Sasem device\n", __func__);
680 
681 
682         dev = usb_get_dev(interface_to_usbdev(interface));
683         iface_desc = interface->cur_altsetting;
684         num_endpoints = iface_desc->desc.bNumEndpoints;
685 
686         /*
687          * Scan the endpoint list and set:
688          *      first input endpoint = IR endpoint
689          *      first output endpoint = VFD endpoint
690          */
691 
692         ir_ep_found = 0;
693         vfd_ep_found = 0;
694 
695         for (i = 0; i < num_endpoints && !(ir_ep_found && vfd_ep_found); ++i) {
696 
697                 struct usb_endpoint_descriptor *ep;
698 
699                 ep = &iface_desc->endpoint [i].desc;
700 
701                 if (!ir_ep_found &&
702                         usb_endpoint_is_int_in(ep)) {
703 
704                         rx_endpoint = ep;
705                         ir_ep_found = 1;
706                         if (debug)
707                                 dev_info(&interface->dev,
708                                         "%s: found IR endpoint\n", __func__);
709 
710                 } else if (!vfd_ep_found &&
711                         usb_endpoint_is_int_out(ep)) {
712 
713                         tx_endpoint = ep;
714                         vfd_ep_found = 1;
715                         if (debug)
716                                 dev_info(&interface->dev,
717                                         "%s: found VFD endpoint\n", __func__);
718                 }
719         }
720 
721         /* Input endpoint is mandatory */
722         if (!ir_ep_found) {
723                 dev_err(&interface->dev,
724                         "%s: no valid input (IR) endpoint found.\n", __func__);
725                 retval = -ENODEV;
726                 goto exit;
727         }
728 
729         if (!vfd_ep_found)
730                 dev_info(&interface->dev,
731                         "%s: no valid output (VFD) endpoint found.\n",
732                         __func__);
733 
734 
735         /* Allocate memory */
736         alloc_status = 0;
737 
738         context = kzalloc(sizeof(struct sasem_context), GFP_KERNEL);
739         if (!context) {
740                 alloc_status = 1;
741                 goto alloc_status_switch;
742         }
743         driver = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL);
744         if (!driver) {
745                 alloc_status = 2;
746                 goto alloc_status_switch;
747         }
748         rbuf = kmalloc(sizeof(struct lirc_buffer), GFP_KERNEL);
749         if (!rbuf) {
750                 alloc_status = 3;
751                 goto alloc_status_switch;
752         }
753         if (lirc_buffer_init(rbuf, BUF_CHUNK_SIZE, BUF_SIZE)) {
754                 dev_err(&interface->dev,
755                         "%s: lirc_buffer_init failed\n", __func__);
756                 alloc_status = 4;
757                 goto alloc_status_switch;
758         }
759         rx_urb = usb_alloc_urb(0, GFP_KERNEL);
760         if (!rx_urb) {
761                 dev_err(&interface->dev,
762                         "%s: usb_alloc_urb failed for IR urb\n", __func__);
763                 alloc_status = 5;
764                 goto alloc_status_switch;
765         }
766         if (vfd_ep_found) {
767                 tx_urb = usb_alloc_urb(0, GFP_KERNEL);
768                 if (!tx_urb) {
769                         dev_err(&interface->dev,
770                                 "%s: usb_alloc_urb failed for VFD urb",
771                                 __func__);
772                         alloc_status = 6;
773                         goto alloc_status_switch;
774                 }
775         }
776 
777         mutex_init(&context->ctx_lock);
778 
779         strcpy(driver->name, MOD_NAME);
780         driver->minor = -1;
781         driver->code_length = 64;
782         driver->sample_rate = 0;
783         driver->features = LIRC_CAN_REC_LIRCCODE;
784         driver->data = context;
785         driver->rbuf = rbuf;
786         driver->set_use_inc = ir_open;
787         driver->set_use_dec = ir_close;
788         driver->dev   = &interface->dev;
789         driver->owner = THIS_MODULE;
790 
791         mutex_lock(&context->ctx_lock);
792 
793         lirc_minor = lirc_register_driver(driver);
794         if (lirc_minor < 0) {
795                 dev_err(&interface->dev,
796                         "%s: lirc_register_driver failed\n", __func__);
797                 alloc_status = 7;
798                 retval = lirc_minor;
799                 goto unlock;
800         } else
801                 dev_info(&interface->dev,
802                          "%s: Registered Sasem driver (minor:%d)\n",
803                          __func__, lirc_minor);
804 
805         /* Needed while unregistering! */
806         driver->minor = lirc_minor;
807 
808         context->dev = dev;
809         context->dev_present = 1;
810         context->rx_endpoint = rx_endpoint;
811         context->rx_urb = rx_urb;
812         if (vfd_ep_found) {
813                 context->tx_endpoint = tx_endpoint;
814                 context->tx_urb = tx_urb;
815                 context->vfd_contrast = 1000;   /* range 0 - 1000 */
816         }
817         context->driver = driver;
818 
819         usb_set_intfdata(interface, context);
820 
821         if (vfd_ep_found) {
822 
823                 if (debug)
824                         dev_info(&interface->dev,
825                                  "Registering VFD with sysfs\n");
826                 if (usb_register_dev(interface, &sasem_class))
827                         /* Not a fatal error, so ignore */
828                         dev_info(&interface->dev,
829                                  "%s: could not get a minor number for VFD\n",
830                                  __func__);
831         }
832 
833         dev_info(&interface->dev,
834                  "%s: Sasem device on usb<%d:%d> initialized\n",
835                  __func__, dev->bus->busnum, dev->devnum);
836 unlock:
837         mutex_unlock(&context->ctx_lock);
838 
839 alloc_status_switch:
840         switch (alloc_status) {
841 
842         case 7:
843                 if (vfd_ep_found)
844                         usb_free_urb(tx_urb);
845         case 6:
846                 usb_free_urb(rx_urb);
847                 /* fall-through */
848         case 5:
849                 lirc_buffer_free(rbuf);
850                 /* fall-through */
851         case 4:
852                 kfree(rbuf);
853                 /* fall-through */
854         case 3:
855                 kfree(driver);
856                 /* fall-through */
857         case 2:
858                 kfree(context);
859                 context = NULL;
860                 /* fall-through */
861         case 1:
862                 if (retval == 0)
863                         retval = -ENOMEM;
864         }
865 
866 exit:
867         return retval;
868 }
869 
870 /**
871  * Callback function for USB core API: disconnect
872  */
873 static void sasem_disconnect(struct usb_interface *interface)
874 {
875         struct sasem_context *context;
876 
877         /* prevent races with ir_open()/vfd_open() */
878         mutex_lock(&disconnect_lock);
879 
880         context = usb_get_intfdata(interface);
881         mutex_lock(&context->ctx_lock);
882 
883         dev_info(&interface->dev, "%s: Sasem device disconnected\n",
884                  __func__);
885 
886         usb_set_intfdata(interface, NULL);
887         context->dev_present = 0;
888 
889         /* Stop reception */
890         usb_kill_urb(context->rx_urb);
891 
892         /* Abort ongoing write */
893         if (atomic_read(&context->tx.busy)) {
894 
895                 usb_kill_urb(context->tx_urb);
896                 wait_for_completion(&context->tx.finished);
897         }
898 
899         /* De-register from lirc_dev if IR port is not open */
900         if (!context->ir_isopen)
901                 deregister_from_lirc(context);
902 
903         usb_deregister_dev(interface, &sasem_class);
904 
905         mutex_unlock(&context->ctx_lock);
906 
907         if (!context->ir_isopen && !context->vfd_isopen)
908                 delete_context(context);
909 
910         mutex_unlock(&disconnect_lock);
911 }
912 
913 module_usb_driver(sasem_driver);
914 

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