Version:  2.0.40 2.2.26 2.4.37 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 3.16 3.17 3.18

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

  1 /*
  2  *   lirc_imon.c:  LIRC/VFD/LCD driver for SoundGraph iMON IR/VFD/LCD
  3  *                 including the iMON PAD model
  4  *
  5  *   Copyright(C) 2004  Venky Raju(dev@venky.ws)
  6  *   Copyright(C) 2009  Jarod Wilson <jarod@wilsonet.com>
  7  *
  8  *   lirc_imon is free software; you can redistribute it and/or modify
  9  *   it under the terms of the GNU General Public License as published by
 10  *   the Free Software Foundation; either version 2 of the License, or
 11  *   (at your option) any later version.
 12  *
 13  *   This program is distributed in the hope that it will be useful,
 14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 16  *   GNU General Public License for more details.
 17  *
 18  *   You should have received a copy of the GNU General Public License
 19  *   along with this program; if not, write to the Free Software
 20  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 21  */
 22 
 23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 24 
 25 #include <linux/errno.h>
 26 #include <linux/kernel.h>
 27 #include <linux/module.h>
 28 #include <linux/slab.h>
 29 #include <linux/uaccess.h>
 30 #include <linux/usb.h>
 31 
 32 #include <media/lirc.h>
 33 #include <media/lirc_dev.h>
 34 
 35 
 36 #define MOD_AUTHOR      "Venky Raju <dev@venky.ws>"
 37 #define MOD_DESC        "Driver for SoundGraph iMON MultiMedia IR/Display"
 38 #define MOD_NAME        "lirc_imon"
 39 #define MOD_VERSION     "0.8"
 40 
 41 #define DISPLAY_MINOR_BASE      144
 42 #define DEVICE_NAME     "lcd%d"
 43 
 44 #define BUF_CHUNK_SIZE  4
 45 #define BUF_SIZE        128
 46 
 47 #define BIT_DURATION    250     /* each bit received is 250us */
 48 
 49 /*** P R O T O T Y P E S ***/
 50 
 51 /* USB Callback prototypes */
 52 static int imon_probe(struct usb_interface *interface,
 53                       const struct usb_device_id *id);
 54 static void imon_disconnect(struct usb_interface *interface);
 55 static void usb_rx_callback(struct urb *urb);
 56 static void usb_tx_callback(struct urb *urb);
 57 
 58 /* suspend/resume support */
 59 static int imon_resume(struct usb_interface *intf);
 60 static int imon_suspend(struct usb_interface *intf, pm_message_t message);
 61 
 62 /* Display file_operations function prototypes */
 63 static int display_open(struct inode *inode, struct file *file);
 64 static int display_close(struct inode *inode, struct file *file);
 65 
 66 /* VFD write operation */
 67 static ssize_t vfd_write(struct file *file, const char __user *buf,
 68                          size_t n_bytes, loff_t *pos);
 69 
 70 /* LIRC driver function prototypes */
 71 static int ir_open(void *data);
 72 static void ir_close(void *data);
 73 
 74 /*** G L O B A L S ***/
 75 #define IMON_DATA_BUF_SZ        35
 76 
 77 struct imon_context {
 78         struct usb_device *usbdev;
 79         /* Newer devices have two interfaces */
 80         int display;                    /* not all controllers do */
 81         int display_isopen;             /* display port has been opened */
 82         int ir_isopen;                  /* IR port open */
 83         int dev_present;                /* USB device presence */
 84         struct mutex ctx_lock;          /* to lock this object */
 85         wait_queue_head_t remove_ok;    /* For unexpected USB disconnects */
 86 
 87         int vfd_proto_6p;               /* some VFD require a 6th packet */
 88 
 89         struct lirc_driver *driver;
 90         struct usb_endpoint_descriptor *rx_endpoint;
 91         struct usb_endpoint_descriptor *tx_endpoint;
 92         struct urb *rx_urb;
 93         struct urb *tx_urb;
 94         unsigned char usb_rx_buf[8];
 95         unsigned char usb_tx_buf[8];
 96 
 97         struct rx_data {
 98                 int count;              /* length of 0 or 1 sequence */
 99                 int prev_bit;           /* logic level of sequence */
100                 int initial_space;      /* initial space flag */
101         } rx;
102 
103         struct tx_t {
104                 unsigned char data_buf[IMON_DATA_BUF_SZ]; /* user data buffer */
105                 struct completion finished;     /* wait for write to finish */
106                 atomic_t busy;                  /* write in progress */
107                 int status;                     /* status of tx completion */
108         } tx;
109 };
110 
111 static const struct file_operations display_fops = {
112         .owner          = THIS_MODULE,
113         .open           = &display_open,
114         .write          = &vfd_write,
115         .release        = &display_close,
116         .llseek         = noop_llseek,
117 };
118 
119 /*
120  * USB Device ID for iMON USB Control Boards
121  *
122  * The Windows drivers contain 6 different inf files, more or less one for
123  * each new device until the 0x0034-0x0046 devices, which all use the same
124  * driver. Some of the devices in the 34-46 range haven't been definitively
125  * identified yet. Early devices have either a TriGem Computer, Inc. or a
126  * Samsung vendor ID (0x0aa8 and 0x04e8 respectively), while all later
127  * devices use the SoundGraph vendor ID (0x15c2).
128  */
129 static struct usb_device_id imon_usb_id_table[] = {
130         /* TriGem iMON (IR only) -- TG_iMON.inf */
131         { USB_DEVICE(0x0aa8, 0x8001) },
132 
133         /* SoundGraph iMON (IR only) -- sg_imon.inf */
134         { USB_DEVICE(0x04e8, 0xff30) },
135 
136         /* SoundGraph iMON VFD (IR & VFD) -- iMON_VFD.inf */
137         { USB_DEVICE(0x0aa8, 0xffda) },
138 
139         /* SoundGraph iMON SS (IR & VFD) -- iMON_SS.inf */
140         { USB_DEVICE(0x15c2, 0xffda) },
141 
142         {}
143 };
144 
145 /* Some iMON VFD models requires a 6th packet for VFD writes */
146 static struct usb_device_id vfd_proto_6p_list[] = {
147         { USB_DEVICE(0x15c2, 0xffda) },
148         {}
149 };
150 
151 /* Some iMON devices have no lcd/vfd, don't set one up */
152 static struct usb_device_id ir_only_list[] = {
153         { USB_DEVICE(0x0aa8, 0x8001) },
154         { USB_DEVICE(0x04e8, 0xff30) },
155         {}
156 };
157 
158 /* USB Device data */
159 static struct usb_driver imon_driver = {
160         .name           = MOD_NAME,
161         .probe          = imon_probe,
162         .disconnect     = imon_disconnect,
163         .suspend        = imon_suspend,
164         .resume         = imon_resume,
165         .id_table       = imon_usb_id_table,
166 };
167 
168 static struct usb_class_driver imon_class = {
169         .name           = DEVICE_NAME,
170         .fops           = &display_fops,
171         .minor_base     = DISPLAY_MINOR_BASE,
172 };
173 
174 /* to prevent races between open() and disconnect(), probing, etc */
175 static DEFINE_MUTEX(driver_lock);
176 
177 static int debug;
178 
179 /***  M O D U L E   C O D E ***/
180 
181 MODULE_AUTHOR(MOD_AUTHOR);
182 MODULE_DESCRIPTION(MOD_DESC);
183 MODULE_VERSION(MOD_VERSION);
184 MODULE_LICENSE("GPL");
185 MODULE_DEVICE_TABLE(usb, imon_usb_id_table);
186 module_param(debug, int, S_IRUGO | S_IWUSR);
187 MODULE_PARM_DESC(debug, "Debug messages: 0=no, 1=yes(default: no)");
188 
189 static void free_imon_context(struct imon_context *context)
190 {
191         struct device *dev = context->driver->dev;
192 
193         usb_free_urb(context->tx_urb);
194         usb_free_urb(context->rx_urb);
195         lirc_buffer_free(context->driver->rbuf);
196         kfree(context->driver->rbuf);
197         kfree(context->driver);
198         kfree(context);
199 
200         dev_dbg(dev, "%s: iMON context freed\n", __func__);
201 }
202 
203 static void deregister_from_lirc(struct imon_context *context)
204 {
205         int retval;
206         int minor = context->driver->minor;
207 
208         retval = lirc_unregister_driver(minor);
209         if (retval)
210                 dev_err(&context->usbdev->dev,
211                         ": %s: unable to deregister from lirc(%d)",
212                         __func__, retval);
213         else
214                 dev_info(&context->usbdev->dev,
215                          "Deregistered iMON driver (minor:%d)\n", minor);
216 
217 }
218 
219 /**
220  * Called when the Display device (e.g. /dev/lcd0)
221  * is opened by the application.
222  */
223 static int display_open(struct inode *inode, struct file *file)
224 {
225         struct usb_interface *interface;
226         struct imon_context *context = NULL;
227         int subminor;
228         int retval = 0;
229 
230         /* prevent races with disconnect */
231         mutex_lock(&driver_lock);
232 
233         subminor = iminor(inode);
234         interface = usb_find_interface(&imon_driver, subminor);
235         if (!interface) {
236                 pr_err("%s: could not find interface for minor %d\n",
237                        __func__, subminor);
238                 retval = -ENODEV;
239                 goto exit;
240         }
241         context = usb_get_intfdata(interface);
242 
243         if (!context) {
244                 dev_err(&interface->dev,
245                         "%s: no context found for minor %d\n",
246                         __func__, subminor);
247                 retval = -ENODEV;
248                 goto exit;
249         }
250 
251         mutex_lock(&context->ctx_lock);
252 
253         if (!context->display) {
254                 dev_err(&interface->dev,
255                         "%s: display not supported by device\n", __func__);
256                 retval = -ENODEV;
257         } else if (context->display_isopen) {
258                 dev_err(&interface->dev,
259                         "%s: display port is already open\n", __func__);
260                 retval = -EBUSY;
261         } else {
262                 context->display_isopen = 1;
263                 file->private_data = context;
264                 dev_info(context->driver->dev, "display port opened\n");
265         }
266 
267         mutex_unlock(&context->ctx_lock);
268 
269 exit:
270         mutex_unlock(&driver_lock);
271         return retval;
272 }
273 
274 /**
275  * Called when the display device (e.g. /dev/lcd0)
276  * is closed by the application.
277  */
278 static int display_close(struct inode *inode, struct file *file)
279 {
280         struct imon_context *context = NULL;
281         int retval = 0;
282 
283         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->display) {
293                 dev_err(&context->usbdev->dev,
294                         "%s: display not supported by device\n", __func__);
295                 retval = -ENODEV;
296         } else if (!context->display_isopen) {
297                 dev_err(&context->usbdev->dev,
298                         "%s: display is not open\n", __func__);
299                 retval = -EIO;
300         } else {
301                 context->display_isopen = 0;
302                 dev_info(context->driver->dev, "display port closed\n");
303                 if (!context->dev_present && !context->ir_isopen) {
304                         /*
305                          * Device disconnected before close and IR port is not
306                          * open. If IR port is open, context will be deleted by
307                          * ir_close.
308                          */
309                         mutex_unlock(&context->ctx_lock);
310                         free_imon_context(context);
311                         return retval;
312                 }
313         }
314 
315         mutex_unlock(&context->ctx_lock);
316         return retval;
317 }
318 
319 /**
320  * Sends a packet to the device -- this function must be called
321  * with context->ctx_lock held.
322  */
323 static int send_packet(struct imon_context *context)
324 {
325         unsigned int pipe;
326         int interval = 0;
327         int retval = 0;
328 
329         /* Check if we need to use control or interrupt urb */
330         pipe = usb_sndintpipe(context->usbdev,
331                               context->tx_endpoint->bEndpointAddress);
332         interval = context->tx_endpoint->bInterval;
333 
334         usb_fill_int_urb(context->tx_urb, context->usbdev, pipe,
335                          context->usb_tx_buf,
336                          sizeof(context->usb_tx_buf),
337                          usb_tx_callback, context, interval);
338 
339         context->tx_urb->actual_length = 0;
340 
341         init_completion(&context->tx.finished);
342         atomic_set(&(context->tx.busy), 1);
343 
344         retval = usb_submit_urb(context->tx_urb, GFP_KERNEL);
345         if (retval) {
346                 atomic_set(&(context->tx.busy), 0);
347                 dev_err(&context->usbdev->dev,
348                         "%s: error submitting urb(%d)\n", __func__, retval);
349         } else {
350                 /* Wait for transmission to complete (or abort) */
351                 mutex_unlock(&context->ctx_lock);
352                 retval = wait_for_completion_interruptible(
353                                 &context->tx.finished);
354                 if (retval)
355                         dev_err(&context->usbdev->dev,
356                                 "%s: task interrupted\n", __func__);
357                 mutex_lock(&context->ctx_lock);
358 
359                 retval = context->tx.status;
360                 if (retval)
361                         dev_err(&context->usbdev->dev,
362                                 "%s: packet tx failed (%d)\n",
363                                 __func__, retval);
364         }
365 
366         return retval;
367 }
368 
369 /**
370  * Writes data to the VFD.  The iMON VFD is 2x16 characters
371  * and requires data in 5 consecutive USB interrupt packets,
372  * each packet but the last carrying 7 bytes.
373  *
374  * I don't know if the VFD board supports features such as
375  * scrolling, clearing rows, blanking, etc. so at
376  * the caller must provide a full screen of data.  If fewer
377  * than 32 bytes are provided spaces will be appended to
378  * generate a full screen.
379  */
380 static ssize_t vfd_write(struct file *file, const char __user *buf,
381                          size_t n_bytes, loff_t *pos)
382 {
383         int i;
384         int offset;
385         int seq;
386         int retval = 0;
387         struct imon_context *context;
388         const unsigned char vfd_packet6[] = {
389                 0x01, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF };
390         int *data_buf = NULL;
391 
392         context = file->private_data;
393         if (!context) {
394                 pr_err("%s: no context for device\n", __func__);
395                 return -ENODEV;
396         }
397 
398         mutex_lock(&context->ctx_lock);
399 
400         if (!context->dev_present) {
401                 dev_err(&context->usbdev->dev,
402                         "%s: no iMON device present\n", __func__);
403                 retval = -ENODEV;
404                 goto exit;
405         }
406 
407         if (n_bytes <= 0 || n_bytes > IMON_DATA_BUF_SZ - 3) {
408                 dev_err(&context->usbdev->dev,
409                         "%s: invalid payload size\n", __func__);
410                 retval = -EINVAL;
411                 goto exit;
412         }
413 
414         data_buf = memdup_user(buf, n_bytes);
415         if (IS_ERR(data_buf)) {
416                 retval = PTR_ERR(data_buf);
417                 data_buf = NULL;
418                 goto exit;
419         }
420 
421         memcpy(context->tx.data_buf, data_buf, n_bytes);
422 
423         /* Pad with spaces */
424         for (i = n_bytes; i < IMON_DATA_BUF_SZ - 3; ++i)
425                 context->tx.data_buf[i] = ' ';
426 
427         for (i = IMON_DATA_BUF_SZ - 3; i < IMON_DATA_BUF_SZ; ++i)
428                 context->tx.data_buf[i] = 0xFF;
429 
430         offset = 0;
431         seq = 0;
432 
433         do {
434                 memcpy(context->usb_tx_buf, context->tx.data_buf + offset, 7);
435                 context->usb_tx_buf[7] = (unsigned char) seq;
436 
437                 retval = send_packet(context);
438                 if (retval) {
439                         dev_err(&context->usbdev->dev,
440                                 "%s: send packet failed for packet #%d\n",
441                                 __func__, seq/2);
442                         goto exit;
443                 } else {
444                         seq += 2;
445                         offset += 7;
446                 }
447 
448         } while (offset < IMON_DATA_BUF_SZ);
449 
450         if (context->vfd_proto_6p) {
451                 /* Send packet #6 */
452                 memcpy(context->usb_tx_buf, &vfd_packet6, sizeof(vfd_packet6));
453                 context->usb_tx_buf[7] = (unsigned char) seq;
454                 retval = send_packet(context);
455                 if (retval)
456                         dev_err(&context->usbdev->dev,
457                                 "%s: send packet failed for packet #%d\n",
458                                         __func__, seq/2);
459         }
460 
461 exit:
462         mutex_unlock(&context->ctx_lock);
463         kfree(data_buf);
464 
465         return (!retval) ? n_bytes : retval;
466 }
467 
468 /**
469  * Callback function for USB core API: transmit data
470  */
471 static void usb_tx_callback(struct urb *urb)
472 {
473         struct imon_context *context;
474 
475         if (!urb)
476                 return;
477         context = (struct imon_context *)urb->context;
478         if (!context)
479                 return;
480 
481         context->tx.status = urb->status;
482 
483         /* notify waiters that write has finished */
484         atomic_set(&context->tx.busy, 0);
485         complete(&context->tx.finished);
486 }
487 
488 /**
489  * Called by lirc_dev when the application opens /dev/lirc
490  */
491 static int ir_open(void *data)
492 {
493         struct imon_context *context;
494 
495         /* prevent races with disconnect */
496         mutex_lock(&driver_lock);
497 
498         context = (struct imon_context *)data;
499 
500         /* initial IR protocol decode variables */
501         context->rx.count = 0;
502         context->rx.initial_space = 1;
503         context->rx.prev_bit = 0;
504 
505         context->ir_isopen = 1;
506         dev_info(context->driver->dev, "IR port opened\n");
507 
508         mutex_unlock(&driver_lock);
509         return 0;
510 }
511 
512 /**
513  * Called by lirc_dev when the application closes /dev/lirc
514  */
515 static void ir_close(void *data)
516 {
517         struct imon_context *context;
518 
519         context = (struct imon_context *)data;
520         if (!context) {
521                 pr_err("%s: no context for device\n", __func__);
522                 return;
523         }
524 
525         mutex_lock(&context->ctx_lock);
526 
527         context->ir_isopen = 0;
528         dev_info(context->driver->dev, "IR port closed\n");
529 
530         if (!context->dev_present) {
531                 /*
532                  * Device disconnected while IR port was still open. Driver
533                  * was not deregistered at disconnect time, so do it now.
534                  */
535                 deregister_from_lirc(context);
536 
537                 if (!context->display_isopen) {
538                         mutex_unlock(&context->ctx_lock);
539                         free_imon_context(context);
540                         return;
541                 }
542                 /*
543                  * If display port is open, context will be deleted by
544                  * display_close
545                  */
546         }
547 
548         mutex_unlock(&context->ctx_lock);
549 }
550 
551 /**
552  * Convert bit count to time duration (in us) and submit
553  * the value to lirc_dev.
554  */
555 static void submit_data(struct imon_context *context)
556 {
557         unsigned char buf[4];
558         int value = context->rx.count;
559         int i;
560 
561         dev_dbg(context->driver->dev, "submitting data to LIRC\n");
562 
563         value *= BIT_DURATION;
564         value &= PULSE_MASK;
565         if (context->rx.prev_bit)
566                 value |= PULSE_BIT;
567 
568         for (i = 0; i < 4; ++i)
569                 buf[i] = value>>(i*8);
570 
571         lirc_buffer_write(context->driver->rbuf, buf);
572         wake_up(&context->driver->rbuf->wait_poll);
573 }
574 
575 static inline int tv2int(const struct timeval *a, const struct timeval *b)
576 {
577         int usecs = 0;
578         int sec   = 0;
579 
580         if (b->tv_usec > a->tv_usec) {
581                 usecs = 1000000;
582                 sec--;
583         }
584 
585         usecs += a->tv_usec - b->tv_usec;
586 
587         sec += a->tv_sec - b->tv_sec;
588         sec *= 1000;
589         usecs /= 1000;
590         sec += usecs;
591 
592         if (sec < 0)
593                 sec = 1000;
594 
595         return sec;
596 }
597 
598 /**
599  * Process the incoming packet
600  */
601 static void imon_incoming_packet(struct imon_context *context,
602                                  struct urb *urb, int intf)
603 {
604         int len = urb->actual_length;
605         unsigned char *buf = urb->transfer_buffer;
606         struct device *dev = context->driver->dev;
607         int octet, bit;
608         unsigned char mask;
609         int i;
610 
611         /*
612          * just bail out if no listening IR client
613          */
614         if (!context->ir_isopen)
615                 return;
616 
617         if (len != 8) {
618                 dev_warn(dev, "imon %s: invalid incoming packet size (len = %d, intf%d)\n",
619                         __func__, len, intf);
620                 return;
621         }
622 
623         if (debug) {
624                 dev_info(dev, "raw packet: ");
625                 for (i = 0; i < len; ++i)
626                         printk("%02x ", buf[i]);
627                 printk("\n");
628         }
629 
630         /*
631          * Translate received data to pulse and space lengths.
632          * Received data is active low, i.e. pulses are 0 and
633          * spaces are 1.
634          *
635          * My original algorithm was essentially similar to
636          * Changwoo Ryu's with the exception that he switched
637          * the incoming bits to active high and also fed an
638          * initial space to LIRC at the start of a new sequence
639          * if the previous bit was a pulse.
640          *
641          * I've decided to adopt his algorithm.
642          */
643 
644         if (buf[7] == 1 && context->rx.initial_space) {
645                 /* LIRC requires a leading space */
646                 context->rx.prev_bit = 0;
647                 context->rx.count = 4;
648                 submit_data(context);
649                 context->rx.count = 0;
650         }
651 
652         for (octet = 0; octet < 5; ++octet) {
653                 mask = 0x80;
654                 for (bit = 0; bit < 8; ++bit) {
655                         int curr_bit = !(buf[octet] & mask);
656 
657                         if (curr_bit != context->rx.prev_bit) {
658                                 if (context->rx.count) {
659                                         submit_data(context);
660                                         context->rx.count = 0;
661                                 }
662                                 context->rx.prev_bit = curr_bit;
663                         }
664                         ++context->rx.count;
665                         mask >>= 1;
666                 }
667         }
668 
669         if (buf[7] == 10) {
670                 if (context->rx.count) {
671                         submit_data(context);
672                         context->rx.count = 0;
673                 }
674                 context->rx.initial_space = context->rx.prev_bit;
675         }
676 }
677 
678 /**
679  * Callback function for USB core API: receive data
680  */
681 static void usb_rx_callback(struct urb *urb)
682 {
683         struct imon_context *context;
684         int intfnum = 0;
685 
686         if (!urb)
687                 return;
688 
689         context = (struct imon_context *)urb->context;
690         if (!context)
691                 return;
692 
693         switch (urb->status) {
694         case -ENOENT:           /* usbcore unlink successful! */
695                 return;
696 
697         case 0:
698                 imon_incoming_packet(context, urb, intfnum);
699                 break;
700 
701         default:
702                 dev_warn(context->driver->dev, "imon %s: status(%d): ignored\n",
703                          __func__, urb->status);
704                 break;
705         }
706 
707         usb_submit_urb(context->rx_urb, GFP_ATOMIC);
708 }
709 
710 /**
711  * Callback function for USB core API: Probe
712  */
713 static int imon_probe(struct usb_interface *interface,
714                       const struct usb_device_id *id)
715 {
716         struct usb_device *usbdev = NULL;
717         struct usb_host_interface *iface_desc = NULL;
718         struct usb_endpoint_descriptor *rx_endpoint = NULL;
719         struct usb_endpoint_descriptor *tx_endpoint = NULL;
720         struct urb *rx_urb = NULL;
721         struct urb *tx_urb = NULL;
722         struct lirc_driver *driver = NULL;
723         struct lirc_buffer *rbuf = NULL;
724         struct device *dev = &interface->dev;
725         int ifnum;
726         int lirc_minor = 0;
727         int num_endpts;
728         int retval = 0;
729         int display_ep_found = 0;
730         int ir_ep_found = 0;
731         int alloc_status = 0;
732         int vfd_proto_6p = 0;
733         struct imon_context *context = NULL;
734         int i;
735         u16 vendor, product;
736 
737         /* prevent races probing devices w/multiple interfaces */
738         mutex_lock(&driver_lock);
739 
740         context = kzalloc(sizeof(struct imon_context), GFP_KERNEL);
741         if (!context) {
742                 alloc_status = 1;
743                 goto alloc_status_switch;
744         }
745 
746         /*
747          * Try to auto-detect the type of display if the user hasn't set
748          * it by hand via the display_type modparam. Default is VFD.
749          */
750         if (usb_match_id(interface, ir_only_list))
751                 context->display = 0;
752         else
753                 context->display = 1;
754 
755         usbdev     = usb_get_dev(interface_to_usbdev(interface));
756         iface_desc = interface->cur_altsetting;
757         num_endpts = iface_desc->desc.bNumEndpoints;
758         ifnum      = iface_desc->desc.bInterfaceNumber;
759         vendor     = le16_to_cpu(usbdev->descriptor.idVendor);
760         product    = le16_to_cpu(usbdev->descriptor.idProduct);
761 
762         dev_dbg(dev, "%s: found iMON device (%04x:%04x, intf%d)\n",
763                 __func__, vendor, product, ifnum);
764 
765         /*
766          * Scan the endpoint list and set:
767          *      first input endpoint = IR endpoint
768          *      first output endpoint = display endpoint
769          */
770         for (i = 0; i < num_endpts && !(ir_ep_found && display_ep_found); ++i) {
771                 struct usb_endpoint_descriptor *ep;
772                 int ep_dir;
773                 int ep_type;
774 
775                 ep = &iface_desc->endpoint[i].desc;
776                 ep_dir = ep->bEndpointAddress & USB_ENDPOINT_DIR_MASK;
777                 ep_type = ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
778 
779                 if (!ir_ep_found &&
780                         ep_dir == USB_DIR_IN &&
781                         ep_type == USB_ENDPOINT_XFER_INT) {
782 
783                         rx_endpoint = ep;
784                         ir_ep_found = 1;
785                         dev_dbg(dev, "%s: found IR endpoint\n", __func__);
786 
787                 } else if (!display_ep_found && ep_dir == USB_DIR_OUT &&
788                            ep_type == USB_ENDPOINT_XFER_INT) {
789                         tx_endpoint = ep;
790                         display_ep_found = 1;
791                         dev_dbg(dev, "%s: found display endpoint\n", __func__);
792                 }
793         }
794 
795         /*
796          * Some iMON receivers have no display. Unfortunately, it seems
797          * that SoundGraph recycles device IDs between devices both with
798          * and without... :\
799          */
800         if (context->display == 0) {
801                 display_ep_found = 0;
802                 dev_dbg(dev, "%s: device has no display\n", __func__);
803         }
804 
805         /* Input endpoint is mandatory */
806         if (!ir_ep_found) {
807                 dev_err(dev, "%s: no valid input (IR) endpoint found.\n",
808                         __func__);
809                 retval = -ENODEV;
810                 alloc_status = 2;
811                 goto alloc_status_switch;
812         }
813 
814         /* Determine if display requires 6 packets */
815         if (display_ep_found) {
816                 if (usb_match_id(interface, vfd_proto_6p_list))
817                         vfd_proto_6p = 1;
818 
819                 dev_dbg(dev, "%s: vfd_proto_6p: %d\n",
820                         __func__, vfd_proto_6p);
821         }
822 
823         driver = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL);
824         if (!driver) {
825                 alloc_status = 2;
826                 goto alloc_status_switch;
827         }
828         rbuf = kmalloc(sizeof(struct lirc_buffer), GFP_KERNEL);
829         if (!rbuf) {
830                 alloc_status = 3;
831                 goto alloc_status_switch;
832         }
833         if (lirc_buffer_init(rbuf, BUF_CHUNK_SIZE, BUF_SIZE)) {
834                 dev_err(dev, "%s: lirc_buffer_init failed\n", __func__);
835                 alloc_status = 4;
836                 goto alloc_status_switch;
837         }
838         rx_urb = usb_alloc_urb(0, GFP_KERNEL);
839         if (!rx_urb) {
840                 dev_err(dev, "%s: usb_alloc_urb failed for IR urb\n", __func__);
841                 alloc_status = 5;
842                 goto alloc_status_switch;
843         }
844         tx_urb = usb_alloc_urb(0, GFP_KERNEL);
845         if (!tx_urb) {
846                 dev_err(dev, "%s: usb_alloc_urb failed for display urb\n",
847                     __func__);
848                 alloc_status = 6;
849                 goto alloc_status_switch;
850         }
851 
852         mutex_init(&context->ctx_lock);
853         context->vfd_proto_6p = vfd_proto_6p;
854 
855         strcpy(driver->name, MOD_NAME);
856         driver->minor = -1;
857         driver->code_length = BUF_CHUNK_SIZE * 8;
858         driver->sample_rate = 0;
859         driver->features = LIRC_CAN_REC_MODE2;
860         driver->data = context;
861         driver->rbuf = rbuf;
862         driver->set_use_inc = ir_open;
863         driver->set_use_dec = ir_close;
864         driver->dev = &interface->dev;
865         driver->owner = THIS_MODULE;
866 
867         mutex_lock(&context->ctx_lock);
868 
869         context->driver = driver;
870         /* start out in keyboard mode */
871 
872         lirc_minor = lirc_register_driver(driver);
873         if (lirc_minor < 0) {
874                 dev_err(dev, "%s: lirc_register_driver failed\n", __func__);
875                 alloc_status = 7;
876                 goto unlock;
877         } else
878                 dev_info(dev, "Registered iMON driver (lirc minor: %d)\n",
879                          lirc_minor);
880 
881         /* Needed while unregistering! */
882         driver->minor = lirc_minor;
883 
884         context->usbdev = usbdev;
885         context->dev_present = 1;
886         context->rx_endpoint = rx_endpoint;
887         context->rx_urb = rx_urb;
888 
889         /*
890          * tx is used to send characters to lcd/vfd, associate RF
891          * remotes, set IR protocol, and maybe more...
892          */
893         context->tx_endpoint = tx_endpoint;
894         context->tx_urb = tx_urb;
895 
896         if (display_ep_found)
897                 context->display = 1;
898 
899         usb_fill_int_urb(context->rx_urb, context->usbdev,
900                 usb_rcvintpipe(context->usbdev,
901                         context->rx_endpoint->bEndpointAddress),
902                 context->usb_rx_buf, sizeof(context->usb_rx_buf),
903                 usb_rx_callback, context,
904                 context->rx_endpoint->bInterval);
905 
906         retval = usb_submit_urb(context->rx_urb, GFP_KERNEL);
907 
908         if (retval) {
909                 dev_err(dev, "%s: usb_submit_urb failed for intf0 (%d)\n",
910                         __func__, retval);
911                 alloc_status = 8;
912                 goto unlock;
913         }
914 
915         usb_set_intfdata(interface, context);
916 
917         if (context->display && ifnum == 0) {
918                 dev_dbg(dev, "%s: Registering iMON display with sysfs\n",
919                         __func__);
920 
921                 if (usb_register_dev(interface, &imon_class)) {
922                         /* Not a fatal error, so ignore */
923                         dev_info(dev, "%s: could not get a minor number for display\n",
924                                  __func__);
925                 }
926         }
927 
928         dev_info(dev, "iMON device (%04x:%04x, intf%d) on usb<%d:%d> initialized\n",
929                 vendor, product, ifnum, usbdev->bus->busnum, usbdev->devnum);
930 
931 unlock:
932         mutex_unlock(&context->ctx_lock);
933 alloc_status_switch:
934 
935         switch (alloc_status) {
936         case 8:
937                 lirc_unregister_driver(driver->minor);
938         case 7:
939                 usb_free_urb(tx_urb);
940         case 6:
941                 usb_free_urb(rx_urb);
942                 /* fall-through */
943         case 5:
944                 if (rbuf)
945                         lirc_buffer_free(rbuf);
946                 /* fall-through */
947         case 4:
948                 kfree(rbuf);
949                 /* fall-through */
950         case 3:
951                 kfree(driver);
952                 /* fall-through */
953         case 2:
954                 kfree(context);
955                 context = NULL;
956         case 1:
957                 if (retval != -ENODEV)
958                         retval = -ENOMEM;
959                 break;
960         case 0:
961                 retval = 0;
962         }
963 
964         mutex_unlock(&driver_lock);
965 
966         return retval;
967 }
968 
969 /**
970  * Callback function for USB core API: disconnect
971  */
972 static void imon_disconnect(struct usb_interface *interface)
973 {
974         struct imon_context *context;
975         int ifnum;
976 
977         /* prevent races with ir_open()/display_open() */
978         mutex_lock(&driver_lock);
979 
980         context = usb_get_intfdata(interface);
981         ifnum = interface->cur_altsetting->desc.bInterfaceNumber;
982 
983         mutex_lock(&context->ctx_lock);
984 
985         usb_set_intfdata(interface, NULL);
986 
987         /* Abort ongoing write */
988         if (atomic_read(&context->tx.busy)) {
989                 usb_kill_urb(context->tx_urb);
990                 complete_all(&context->tx.finished);
991         }
992 
993         context->dev_present = 0;
994         usb_kill_urb(context->rx_urb);
995         if (context->display)
996                 usb_deregister_dev(interface, &imon_class);
997 
998         if (!context->ir_isopen && !context->dev_present) {
999                 deregister_from_lirc(context);
1000                 mutex_unlock(&context->ctx_lock);
1001                 if (!context->display_isopen)
1002                         free_imon_context(context);
1003         } else
1004                 mutex_unlock(&context->ctx_lock);
1005 
1006         mutex_unlock(&driver_lock);
1007 
1008         dev_info(&interface->dev, "%s: iMON device (intf%d) disconnected\n",
1009                  __func__, ifnum);
1010 }
1011 
1012 static int imon_suspend(struct usb_interface *intf, pm_message_t message)
1013 {
1014         struct imon_context *context = usb_get_intfdata(intf);
1015 
1016         usb_kill_urb(context->rx_urb);
1017 
1018         return 0;
1019 }
1020 
1021 static int imon_resume(struct usb_interface *intf)
1022 {
1023         struct imon_context *context = usb_get_intfdata(intf);
1024 
1025         usb_fill_int_urb(context->rx_urb, context->usbdev,
1026                 usb_rcvintpipe(context->usbdev,
1027                         context->rx_endpoint->bEndpointAddress),
1028                 context->usb_rx_buf, sizeof(context->usb_rx_buf),
1029                 usb_rx_callback, context,
1030                 context->rx_endpoint->bInterval);
1031 
1032         return usb_submit_urb(context->rx_urb, GFP_ATOMIC);
1033 }
1034 
1035 module_usb_driver(imon_driver);
1036 

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