Version:  2.0.40 2.2.26 2.4.37 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 3.19 4.0 4.1

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                         "unable to deregister from lirc(%d)", retval);
212         else
213                 dev_info(&context->usbdev->dev,
214                          "Deregistered iMON driver (minor:%d)\n", minor);
215 
216 }
217 
218 /**
219  * Called when the Display device (e.g. /dev/lcd0)
220  * is opened by the application.
221  */
222 static int display_open(struct inode *inode, struct file *file)
223 {
224         struct usb_interface *interface;
225         struct imon_context *context = NULL;
226         int subminor;
227         int retval = 0;
228 
229         /* prevent races with disconnect */
230         mutex_lock(&driver_lock);
231 
232         subminor = iminor(inode);
233         interface = usb_find_interface(&imon_driver, subminor);
234         if (!interface) {
235                 pr_err("%s: could not find interface for minor %d\n",
236                        __func__, subminor);
237                 retval = -ENODEV;
238                 goto exit;
239         }
240         context = usb_get_intfdata(interface);
241 
242         if (!context) {
243                 dev_err(&interface->dev, "no context found for minor %d\n",
244                         subminor);
245                 retval = -ENODEV;
246                 goto exit;
247         }
248 
249         mutex_lock(&context->ctx_lock);
250 
251         if (!context->display) {
252                 dev_err(&interface->dev,
253                         "%s: display not supported by device\n", __func__);
254                 retval = -ENODEV;
255         } else if (context->display_isopen) {
256                 dev_err(&interface->dev,
257                         "%s: display port is already open\n", __func__);
258                 retval = -EBUSY;
259         } else {
260                 context->display_isopen = 1;
261                 file->private_data = context;
262                 dev_info(context->driver->dev, "display port opened\n");
263         }
264 
265         mutex_unlock(&context->ctx_lock);
266 
267 exit:
268         mutex_unlock(&driver_lock);
269         return retval;
270 }
271 
272 /**
273  * Called when the display device (e.g. /dev/lcd0)
274  * is closed by the application.
275  */
276 static int display_close(struct inode *inode, struct file *file)
277 {
278         struct imon_context *context = NULL;
279         int retval = 0;
280 
281         context = file->private_data;
282 
283         if (!context) {
284                 pr_err("%s: no context for device\n", __func__);
285                 return -ENODEV;
286         }
287 
288         mutex_lock(&context->ctx_lock);
289 
290         if (!context->display) {
291                 dev_err(&context->usbdev->dev,
292                         "%s: display not supported by device\n", __func__);
293                 retval = -ENODEV;
294         } else if (!context->display_isopen) {
295                 dev_err(&context->usbdev->dev,
296                         "%s: display is not open\n", __func__);
297                 retval = -EIO;
298         } else {
299                 context->display_isopen = 0;
300                 dev_info(context->driver->dev, "display port closed\n");
301                 if (!context->dev_present && !context->ir_isopen) {
302                         /*
303                          * Device disconnected before close and IR port is not
304                          * open. If IR port is open, context will be deleted by
305                          * ir_close.
306                          */
307                         mutex_unlock(&context->ctx_lock);
308                         free_imon_context(context);
309                         return retval;
310                 }
311         }
312 
313         mutex_unlock(&context->ctx_lock);
314         return retval;
315 }
316 
317 /**
318  * Sends a packet to the device -- this function must be called
319  * with context->ctx_lock held.
320  */
321 static int send_packet(struct imon_context *context)
322 {
323         unsigned int pipe;
324         int interval = 0;
325         int retval = 0;
326 
327         /* Check if we need to use control or interrupt urb */
328         pipe = usb_sndintpipe(context->usbdev,
329                               context->tx_endpoint->bEndpointAddress);
330         interval = context->tx_endpoint->bInterval;
331 
332         usb_fill_int_urb(context->tx_urb, context->usbdev, pipe,
333                          context->usb_tx_buf,
334                          sizeof(context->usb_tx_buf),
335                          usb_tx_callback, context, interval);
336 
337         context->tx_urb->actual_length = 0;
338 
339         init_completion(&context->tx.finished);
340         atomic_set(&context->tx.busy, 1);
341 
342         retval = usb_submit_urb(context->tx_urb, GFP_KERNEL);
343         if (retval) {
344                 atomic_set(&context->tx.busy, 0);
345                 dev_err(&context->usbdev->dev, "error submitting urb(%d)\n",
346                         retval);
347         } else {
348                 /* Wait for transmission to complete (or abort) */
349                 mutex_unlock(&context->ctx_lock);
350                 retval = wait_for_completion_interruptible(
351                                 &context->tx.finished);
352                 if (retval)
353                         dev_err(&context->usbdev->dev,
354                                 "%s: task interrupted\n", __func__);
355                 mutex_lock(&context->ctx_lock);
356 
357                 retval = context->tx.status;
358                 if (retval)
359                         dev_err(&context->usbdev->dev,
360                                 "packet tx failed (%d)\n", retval);
361         }
362 
363         return retval;
364 }
365 
366 /**
367  * Writes data to the VFD.  The iMON VFD is 2x16 characters
368  * and requires data in 5 consecutive USB interrupt packets,
369  * each packet but the last carrying 7 bytes.
370  *
371  * I don't know if the VFD board supports features such as
372  * scrolling, clearing rows, blanking, etc. so at
373  * the caller must provide a full screen of data.  If fewer
374  * than 32 bytes are provided spaces will be appended to
375  * generate a full screen.
376  */
377 static ssize_t vfd_write(struct file *file, const char __user *buf,
378                          size_t n_bytes, loff_t *pos)
379 {
380         int i;
381         int offset;
382         int seq;
383         int retval = 0;
384         struct imon_context *context;
385         const unsigned char vfd_packet6[] = {
386                 0x01, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF };
387         int *data_buf = NULL;
388 
389         context = file->private_data;
390         if (!context) {
391                 pr_err("%s: no context for device\n", __func__);
392                 return -ENODEV;
393         }
394 
395         mutex_lock(&context->ctx_lock);
396 
397         if (!context->dev_present) {
398                 dev_err(&context->usbdev->dev,
399                         "%s: no iMON device present\n", __func__);
400                 retval = -ENODEV;
401                 goto exit;
402         }
403 
404         if (n_bytes <= 0 || n_bytes > IMON_DATA_BUF_SZ - 3) {
405                 dev_err(&context->usbdev->dev,
406                         "%s: invalid payload size\n", __func__);
407                 retval = -EINVAL;
408                 goto exit;
409         }
410 
411         data_buf = memdup_user(buf, n_bytes);
412         if (IS_ERR(data_buf)) {
413                 retval = PTR_ERR(data_buf);
414                 data_buf = NULL;
415                 goto exit;
416         }
417 
418         memcpy(context->tx.data_buf, data_buf, n_bytes);
419 
420         /* Pad with spaces */
421         for (i = n_bytes; i < IMON_DATA_BUF_SZ - 3; ++i)
422                 context->tx.data_buf[i] = ' ';
423 
424         for (i = IMON_DATA_BUF_SZ - 3; i < IMON_DATA_BUF_SZ; ++i)
425                 context->tx.data_buf[i] = 0xFF;
426 
427         offset = 0;
428         seq = 0;
429 
430         do {
431                 memcpy(context->usb_tx_buf, context->tx.data_buf + offset, 7);
432                 context->usb_tx_buf[7] = (unsigned char) seq;
433 
434                 retval = send_packet(context);
435                 if (retval) {
436                         dev_err(&context->usbdev->dev,
437                                 "send packet failed for packet #%d\n",
438                                 seq / 2);
439                         goto exit;
440                 } else {
441                         seq += 2;
442                         offset += 7;
443                 }
444 
445         } while (offset < IMON_DATA_BUF_SZ);
446 
447         if (context->vfd_proto_6p) {
448                 /* Send packet #6 */
449                 memcpy(context->usb_tx_buf, &vfd_packet6, sizeof(vfd_packet6));
450                 context->usb_tx_buf[7] = (unsigned char) seq;
451                 retval = send_packet(context);
452                 if (retval)
453                         dev_err(&context->usbdev->dev,
454                                 "send packet failed for packet #%d\n",
455                                 seq / 2);
456         }
457 
458 exit:
459         mutex_unlock(&context->ctx_lock);
460         kfree(data_buf);
461 
462         return (!retval) ? n_bytes : retval;
463 }
464 
465 /**
466  * Callback function for USB core API: transmit data
467  */
468 static void usb_tx_callback(struct urb *urb)
469 {
470         struct imon_context *context;
471 
472         if (!urb)
473                 return;
474         context = (struct imon_context *)urb->context;
475         if (!context)
476                 return;
477 
478         context->tx.status = urb->status;
479 
480         /* notify waiters that write has finished */
481         atomic_set(&context->tx.busy, 0);
482         complete(&context->tx.finished);
483 }
484 
485 /**
486  * Called by lirc_dev when the application opens /dev/lirc
487  */
488 static int ir_open(void *data)
489 {
490         struct imon_context *context;
491 
492         /* prevent races with disconnect */
493         mutex_lock(&driver_lock);
494 
495         context = data;
496 
497         /* initial IR protocol decode variables */
498         context->rx.count = 0;
499         context->rx.initial_space = 1;
500         context->rx.prev_bit = 0;
501 
502         context->ir_isopen = 1;
503         dev_info(context->driver->dev, "IR port opened\n");
504 
505         mutex_unlock(&driver_lock);
506         return 0;
507 }
508 
509 /**
510  * Called by lirc_dev when the application closes /dev/lirc
511  */
512 static void ir_close(void *data)
513 {
514         struct imon_context *context;
515 
516         context = data;
517         if (!context) {
518                 pr_err("%s: no context for device\n", __func__);
519                 return;
520         }
521 
522         mutex_lock(&context->ctx_lock);
523 
524         context->ir_isopen = 0;
525         dev_info(context->driver->dev, "IR port closed\n");
526 
527         if (!context->dev_present) {
528                 /*
529                  * Device disconnected while IR port was still open. Driver
530                  * was not deregistered at disconnect time, so do it now.
531                  */
532                 deregister_from_lirc(context);
533 
534                 if (!context->display_isopen) {
535                         mutex_unlock(&context->ctx_lock);
536                         free_imon_context(context);
537                         return;
538                 }
539                 /*
540                  * If display port is open, context will be deleted by
541                  * display_close
542                  */
543         }
544 
545         mutex_unlock(&context->ctx_lock);
546 }
547 
548 /**
549  * Convert bit count to time duration (in us) and submit
550  * the value to lirc_dev.
551  */
552 static void submit_data(struct imon_context *context)
553 {
554         unsigned char buf[4];
555         int value = context->rx.count;
556         int i;
557 
558         dev_dbg(context->driver->dev, "submitting data to LIRC\n");
559 
560         value *= BIT_DURATION;
561         value &= PULSE_MASK;
562         if (context->rx.prev_bit)
563                 value |= PULSE_BIT;
564 
565         for (i = 0; i < 4; ++i)
566                 buf[i] = value>>(i*8);
567 
568         lirc_buffer_write(context->driver->rbuf, buf);
569         wake_up(&context->driver->rbuf->wait_poll);
570 }
571 
572 /**
573  * Process the incoming packet
574  */
575 static void imon_incoming_packet(struct imon_context *context,
576                                  struct urb *urb, int intf)
577 {
578         int len = urb->actual_length;
579         unsigned char *buf = urb->transfer_buffer;
580         struct device *dev = context->driver->dev;
581         int octet, bit;
582         unsigned char mask;
583 
584         /*
585          * just bail out if no listening IR client
586          */
587         if (!context->ir_isopen)
588                 return;
589 
590         if (len != 8) {
591                 dev_warn(dev, "imon %s: invalid incoming packet size (len = %d, intf%d)\n",
592                         __func__, len, intf);
593                 return;
594         }
595 
596         if (debug)
597                 dev_info(dev, "raw packet: %*ph\n", len, buf);
598         /*
599          * Translate received data to pulse and space lengths.
600          * Received data is active low, i.e. pulses are 0 and
601          * spaces are 1.
602          *
603          * My original algorithm was essentially similar to
604          * Changwoo Ryu's with the exception that he switched
605          * the incoming bits to active high and also fed an
606          * initial space to LIRC at the start of a new sequence
607          * if the previous bit was a pulse.
608          *
609          * I've decided to adopt his algorithm.
610          */
611 
612         if (buf[7] == 1 && context->rx.initial_space) {
613                 /* LIRC requires a leading space */
614                 context->rx.prev_bit = 0;
615                 context->rx.count = 4;
616                 submit_data(context);
617                 context->rx.count = 0;
618         }
619 
620         for (octet = 0; octet < 5; ++octet) {
621                 mask = 0x80;
622                 for (bit = 0; bit < 8; ++bit) {
623                         int curr_bit = !(buf[octet] & mask);
624 
625                         if (curr_bit != context->rx.prev_bit) {
626                                 if (context->rx.count) {
627                                         submit_data(context);
628                                         context->rx.count = 0;
629                                 }
630                                 context->rx.prev_bit = curr_bit;
631                         }
632                         ++context->rx.count;
633                         mask >>= 1;
634                 }
635         }
636 
637         if (buf[7] == 10) {
638                 if (context->rx.count) {
639                         submit_data(context);
640                         context->rx.count = 0;
641                 }
642                 context->rx.initial_space = context->rx.prev_bit;
643         }
644 }
645 
646 /**
647  * Callback function for USB core API: receive data
648  */
649 static void usb_rx_callback(struct urb *urb)
650 {
651         struct imon_context *context;
652         int intfnum = 0;
653 
654         if (!urb)
655                 return;
656 
657         context = (struct imon_context *)urb->context;
658         if (!context)
659                 return;
660 
661         switch (urb->status) {
662         case -ENOENT:           /* usbcore unlink successful! */
663                 return;
664 
665         case 0:
666                 imon_incoming_packet(context, urb, intfnum);
667                 break;
668 
669         default:
670                 dev_warn(context->driver->dev, "imon %s: status(%d): ignored\n",
671                          __func__, urb->status);
672                 break;
673         }
674 
675         usb_submit_urb(context->rx_urb, GFP_ATOMIC);
676 }
677 
678 /**
679  * Callback function for USB core API: Probe
680  */
681 static int imon_probe(struct usb_interface *interface,
682                       const struct usb_device_id *id)
683 {
684         struct usb_device *usbdev = NULL;
685         struct usb_host_interface *iface_desc = NULL;
686         struct usb_endpoint_descriptor *rx_endpoint = NULL;
687         struct usb_endpoint_descriptor *tx_endpoint = NULL;
688         struct urb *rx_urb = NULL;
689         struct urb *tx_urb = NULL;
690         struct lirc_driver *driver = NULL;
691         struct lirc_buffer *rbuf = NULL;
692         struct device *dev = &interface->dev;
693         int ifnum;
694         int lirc_minor = 0;
695         int num_endpts;
696         int retval = 0;
697         int display_ep_found = 0;
698         int ir_ep_found = 0;
699         int alloc_status = 0;
700         int vfd_proto_6p = 0;
701         struct imon_context *context = NULL;
702         int i;
703         u16 vendor, product;
704 
705         /* prevent races probing devices w/multiple interfaces */
706         mutex_lock(&driver_lock);
707 
708         context = kzalloc(sizeof(struct imon_context), GFP_KERNEL);
709         if (!context) {
710                 alloc_status = 1;
711                 goto alloc_status_switch;
712         }
713 
714         /*
715          * Try to auto-detect the type of display if the user hasn't set
716          * it by hand via the display_type modparam. Default is VFD.
717          */
718         if (usb_match_id(interface, ir_only_list))
719                 context->display = 0;
720         else
721                 context->display = 1;
722 
723         usbdev     = usb_get_dev(interface_to_usbdev(interface));
724         iface_desc = interface->cur_altsetting;
725         num_endpts = iface_desc->desc.bNumEndpoints;
726         ifnum      = iface_desc->desc.bInterfaceNumber;
727         vendor     = le16_to_cpu(usbdev->descriptor.idVendor);
728         product    = le16_to_cpu(usbdev->descriptor.idProduct);
729 
730         dev_dbg(dev, "%s: found iMON device (%04x:%04x, intf%d)\n",
731                 __func__, vendor, product, ifnum);
732 
733         /*
734          * Scan the endpoint list and set:
735          *      first input endpoint = IR endpoint
736          *      first output endpoint = display endpoint
737          */
738         for (i = 0; i < num_endpts && !(ir_ep_found && display_ep_found); ++i) {
739                 struct usb_endpoint_descriptor *ep;
740                 int ep_dir;
741                 int ep_type;
742 
743                 ep = &iface_desc->endpoint[i].desc;
744                 ep_dir = ep->bEndpointAddress & USB_ENDPOINT_DIR_MASK;
745                 ep_type = ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
746 
747                 if (!ir_ep_found &&
748                         ep_dir == USB_DIR_IN &&
749                         ep_type == USB_ENDPOINT_XFER_INT) {
750 
751                         rx_endpoint = ep;
752                         ir_ep_found = 1;
753                         dev_dbg(dev, "%s: found IR endpoint\n", __func__);
754 
755                 } else if (!display_ep_found && ep_dir == USB_DIR_OUT &&
756                            ep_type == USB_ENDPOINT_XFER_INT) {
757                         tx_endpoint = ep;
758                         display_ep_found = 1;
759                         dev_dbg(dev, "%s: found display endpoint\n", __func__);
760                 }
761         }
762 
763         /*
764          * Some iMON receivers have no display. Unfortunately, it seems
765          * that SoundGraph recycles device IDs between devices both with
766          * and without... :\
767          */
768         if (context->display == 0) {
769                 display_ep_found = 0;
770                 dev_dbg(dev, "%s: device has no display\n", __func__);
771         }
772 
773         /* Input endpoint is mandatory */
774         if (!ir_ep_found) {
775                 dev_err(dev, "%s: no valid input (IR) endpoint found.\n",
776                         __func__);
777                 retval = -ENODEV;
778                 alloc_status = 2;
779                 goto alloc_status_switch;
780         }
781 
782         /* Determine if display requires 6 packets */
783         if (display_ep_found) {
784                 if (usb_match_id(interface, vfd_proto_6p_list))
785                         vfd_proto_6p = 1;
786 
787                 dev_dbg(dev, "%s: vfd_proto_6p: %d\n",
788                         __func__, vfd_proto_6p);
789         }
790 
791         driver = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL);
792         if (!driver) {
793                 alloc_status = 2;
794                 goto alloc_status_switch;
795         }
796         rbuf = kmalloc(sizeof(struct lirc_buffer), GFP_KERNEL);
797         if (!rbuf) {
798                 alloc_status = 3;
799                 goto alloc_status_switch;
800         }
801         if (lirc_buffer_init(rbuf, BUF_CHUNK_SIZE, BUF_SIZE)) {
802                 dev_err(dev, "%s: lirc_buffer_init failed\n", __func__);
803                 alloc_status = 4;
804                 goto alloc_status_switch;
805         }
806         rx_urb = usb_alloc_urb(0, GFP_KERNEL);
807         if (!rx_urb) {
808                 dev_err(dev, "%s: usb_alloc_urb failed for IR urb\n", __func__);
809                 alloc_status = 5;
810                 goto alloc_status_switch;
811         }
812         tx_urb = usb_alloc_urb(0, GFP_KERNEL);
813         if (!tx_urb) {
814                 dev_err(dev, "%s: usb_alloc_urb failed for display urb\n",
815                     __func__);
816                 alloc_status = 6;
817                 goto alloc_status_switch;
818         }
819 
820         mutex_init(&context->ctx_lock);
821         context->vfd_proto_6p = vfd_proto_6p;
822 
823         strcpy(driver->name, MOD_NAME);
824         driver->minor = -1;
825         driver->code_length = BUF_CHUNK_SIZE * 8;
826         driver->sample_rate = 0;
827         driver->features = LIRC_CAN_REC_MODE2;
828         driver->data = context;
829         driver->rbuf = rbuf;
830         driver->set_use_inc = ir_open;
831         driver->set_use_dec = ir_close;
832         driver->dev = &interface->dev;
833         driver->owner = THIS_MODULE;
834 
835         mutex_lock(&context->ctx_lock);
836 
837         context->driver = driver;
838         /* start out in keyboard mode */
839 
840         lirc_minor = lirc_register_driver(driver);
841         if (lirc_minor < 0) {
842                 dev_err(dev, "%s: lirc_register_driver failed\n", __func__);
843                 alloc_status = 7;
844                 goto unlock;
845         } else
846                 dev_info(dev, "Registered iMON driver (lirc minor: %d)\n",
847                          lirc_minor);
848 
849         /* Needed while unregistering! */
850         driver->minor = lirc_minor;
851 
852         context->usbdev = usbdev;
853         context->dev_present = 1;
854         context->rx_endpoint = rx_endpoint;
855         context->rx_urb = rx_urb;
856 
857         /*
858          * tx is used to send characters to lcd/vfd, associate RF
859          * remotes, set IR protocol, and maybe more...
860          */
861         context->tx_endpoint = tx_endpoint;
862         context->tx_urb = tx_urb;
863 
864         if (display_ep_found)
865                 context->display = 1;
866 
867         usb_fill_int_urb(context->rx_urb, context->usbdev,
868                 usb_rcvintpipe(context->usbdev,
869                         context->rx_endpoint->bEndpointAddress),
870                 context->usb_rx_buf, sizeof(context->usb_rx_buf),
871                 usb_rx_callback, context,
872                 context->rx_endpoint->bInterval);
873 
874         retval = usb_submit_urb(context->rx_urb, GFP_KERNEL);
875 
876         if (retval) {
877                 dev_err(dev, "usb_submit_urb failed for intf0 (%d)\n", retval);
878                 alloc_status = 8;
879                 goto unlock;
880         }
881 
882         usb_set_intfdata(interface, context);
883 
884         if (context->display && ifnum == 0) {
885                 dev_dbg(dev, "%s: Registering iMON display with sysfs\n",
886                         __func__);
887 
888                 if (usb_register_dev(interface, &imon_class)) {
889                         /* Not a fatal error, so ignore */
890                         dev_info(dev, "%s: could not get a minor number for display\n",
891                                  __func__);
892                 }
893         }
894 
895         dev_info(dev, "iMON device (%04x:%04x, intf%d) on usb<%d:%d> initialized\n",
896                 vendor, product, ifnum, usbdev->bus->busnum, usbdev->devnum);
897 
898 unlock:
899         mutex_unlock(&context->ctx_lock);
900 alloc_status_switch:
901 
902         switch (alloc_status) {
903         case 8:
904                 lirc_unregister_driver(driver->minor);
905         case 7:
906                 usb_free_urb(tx_urb);
907         case 6:
908                 usb_free_urb(rx_urb);
909                 /* fall-through */
910         case 5:
911                 if (rbuf)
912                         lirc_buffer_free(rbuf);
913                 /* fall-through */
914         case 4:
915                 kfree(rbuf);
916                 /* fall-through */
917         case 3:
918                 kfree(driver);
919                 /* fall-through */
920         case 2:
921                 kfree(context);
922                 context = NULL;
923         case 1:
924                 if (retval != -ENODEV)
925                         retval = -ENOMEM;
926                 break;
927         case 0:
928                 retval = 0;
929         }
930 
931         mutex_unlock(&driver_lock);
932 
933         return retval;
934 }
935 
936 /**
937  * Callback function for USB core API: disconnect
938  */
939 static void imon_disconnect(struct usb_interface *interface)
940 {
941         struct imon_context *context;
942         int ifnum;
943 
944         /* prevent races with ir_open()/display_open() */
945         mutex_lock(&driver_lock);
946 
947         context = usb_get_intfdata(interface);
948         ifnum = interface->cur_altsetting->desc.bInterfaceNumber;
949 
950         mutex_lock(&context->ctx_lock);
951 
952         usb_set_intfdata(interface, NULL);
953 
954         /* Abort ongoing write */
955         if (atomic_read(&context->tx.busy)) {
956                 usb_kill_urb(context->tx_urb);
957                 complete_all(&context->tx.finished);
958         }
959 
960         context->dev_present = 0;
961         usb_kill_urb(context->rx_urb);
962         if (context->display)
963                 usb_deregister_dev(interface, &imon_class);
964 
965         if (!context->ir_isopen && !context->dev_present) {
966                 deregister_from_lirc(context);
967                 mutex_unlock(&context->ctx_lock);
968                 if (!context->display_isopen)
969                         free_imon_context(context);
970         } else
971                 mutex_unlock(&context->ctx_lock);
972 
973         mutex_unlock(&driver_lock);
974 
975         dev_info(&interface->dev, "%s: iMON device (intf%d) disconnected\n",
976                  __func__, ifnum);
977 }
978 
979 static int imon_suspend(struct usb_interface *intf, pm_message_t message)
980 {
981         struct imon_context *context = usb_get_intfdata(intf);
982 
983         usb_kill_urb(context->rx_urb);
984 
985         return 0;
986 }
987 
988 static int imon_resume(struct usb_interface *intf)
989 {
990         struct imon_context *context = usb_get_intfdata(intf);
991 
992         usb_fill_int_urb(context->rx_urb, context->usbdev,
993                 usb_rcvintpipe(context->usbdev,
994                         context->rx_endpoint->bEndpointAddress),
995                 context->usb_rx_buf, sizeof(context->usb_rx_buf),
996                 usb_rx_callback, context,
997                 context->rx_endpoint->bInterval);
998 
999         return usb_submit_urb(context->rx_urb, GFP_ATOMIC);
1000 }
1001 
1002 module_usb_driver(imon_driver);
1003 

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