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/init.h>
41 #include <linux/kernel.h>
42 #include <linux/module.h>
43 #include <linux/slab.h>
44 #include <linux/uaccess.h>
45 #include <linux/usb.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 *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 struct timeval 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
delete_context(struct sasem_context * context)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 if (debug)
176 pr_info("%s: context deleted\n", __func__);
177 }
178
deregister_from_lirc(struct sasem_context * context)179 static void deregister_from_lirc(struct sasem_context *context)
180 {
181 int retval;
182 int minor = context->driver->minor;
183
184 retval = lirc_unregister_driver(minor);
185 if (retval)
186 pr_err("%s: unable to deregister from lirc (%d)\n",
187 __func__, retval);
188 else
189 pr_info("Deregistered Sasem driver (minor:%d)\n", minor);
190
191 }
192
193 /**
194 * Called when the VFD device (e.g. /dev/usb/lcd)
195 * is opened by the application.
196 */
vfd_open(struct inode * inode,struct file * file)197 static int vfd_open(struct inode *inode, struct file *file)
198 {
199 struct usb_interface *interface;
200 struct sasem_context *context = NULL;
201 int subminor;
202 int retval = 0;
203
204 /* prevent races with disconnect */
205 mutex_lock(&disconnect_lock);
206
207 subminor = iminor(inode);
208 interface = usb_find_interface(&sasem_driver, subminor);
209 if (!interface) {
210 pr_err("%s: could not find interface for minor %d\n",
211 __func__, subminor);
212 retval = -ENODEV;
213 goto exit;
214 }
215 context = usb_get_intfdata(interface);
216
217 if (!context) {
218 dev_err(&interface->dev,
219 "%s: no context found for minor %d\n",
220 __func__, subminor);
221 retval = -ENODEV;
222 goto exit;
223 }
224
225 mutex_lock(&context->ctx_lock);
226
227 if (context->vfd_isopen) {
228 dev_err(&interface->dev,
229 "%s: VFD port is already open", __func__);
230 retval = -EBUSY;
231 } else {
232 context->vfd_isopen = 1;
233 file->private_data = context;
234 dev_info(&interface->dev, "VFD port opened\n");
235 }
236
237 mutex_unlock(&context->ctx_lock);
238
239 exit:
240 mutex_unlock(&disconnect_lock);
241 return retval;
242 }
243
244 /**
245 * Called when the VFD device (e.g. /dev/usb/lcd)
246 * is closed by the application.
247 */
vfd_ioctl(struct file * file,unsigned cmd,unsigned long arg)248 static long vfd_ioctl(struct file *file, unsigned cmd, unsigned long arg)
249 {
250 struct sasem_context *context = NULL;
251
252 context = (struct sasem_context *) file->private_data;
253
254 if (!context) {
255 pr_err("%s: no context for device\n", __func__);
256 return -ENODEV;
257 }
258
259 mutex_lock(&context->ctx_lock);
260
261 switch (cmd) {
262 case IOCTL_LCD_CONTRAST:
263 if (arg > 1000)
264 arg = 1000;
265 context->vfd_contrast = (unsigned int)arg;
266 break;
267 default:
268 pr_info("Unknown IOCTL command\n");
269 mutex_unlock(&context->ctx_lock);
270 return -ENOIOCTLCMD; /* not supported */
271 }
272
273 mutex_unlock(&context->ctx_lock);
274 return 0;
275 }
276
277 /**
278 * Called when the VFD device (e.g. /dev/usb/lcd)
279 * is closed by the application.
280 */
vfd_close(struct inode * inode,struct file * file)281 static int vfd_close(struct inode *inode, struct file *file)
282 {
283 struct sasem_context *context = NULL;
284 int retval = 0;
285
286 context = (struct sasem_context *) file->private_data;
287
288 if (!context) {
289 pr_err("%s: no context for device\n", __func__);
290 return -ENODEV;
291 }
292
293 mutex_lock(&context->ctx_lock);
294
295 if (!context->vfd_isopen) {
296 dev_err(&context->dev->dev, "%s: VFD is not open\n", __func__);
297 retval = -EIO;
298 } else {
299 context->vfd_isopen = 0;
300 dev_info(&context->dev->dev, "VFD port closed\n");
301 if (!context->dev_present && !context->ir_isopen) {
302
303 /* Device disconnected before close and IR port is
304 * not open. If IR port is open, context will be
305 * deleted by ir_close. */
306 mutex_unlock(&context->ctx_lock);
307 delete_context(context);
308 return retval;
309 }
310 }
311
312 mutex_unlock(&context->ctx_lock);
313 return retval;
314 }
315
316 /**
317 * Sends a packet to the VFD.
318 */
send_packet(struct sasem_context * context)319 static int send_packet(struct sasem_context *context)
320 {
321 unsigned int pipe;
322 int interval = 0;
323 int retval = 0;
324
325 pipe = usb_sndintpipe(context->dev,
326 context->tx_endpoint->bEndpointAddress);
327 interval = context->tx_endpoint->bInterval;
328
329 usb_fill_int_urb(context->tx_urb, context->dev, pipe,
330 context->usb_tx_buf, sizeof(context->usb_tx_buf),
331 usb_tx_callback, context, interval);
332
333 context->tx_urb->actual_length = 0;
334
335 init_completion(&context->tx.finished);
336 atomic_set(&(context->tx.busy), 1);
337
338 retval = usb_submit_urb(context->tx_urb, GFP_KERNEL);
339 if (retval) {
340 atomic_set(&(context->tx.busy), 0);
341 dev_err(&context->dev->dev, "%s: error submitting urb (%d)\n",
342 __func__, retval);
343 } else {
344 /* Wait for transmission to complete (or abort) */
345 mutex_unlock(&context->ctx_lock);
346 wait_for_completion(&context->tx.finished);
347 mutex_lock(&context->ctx_lock);
348
349 retval = context->tx.status;
350 if (retval)
351 dev_err(&context->dev->dev,
352 "%s: packet tx failed (%d)\n",
353 __func__, retval);
354 }
355
356 return retval;
357 }
358
359 /**
360 * Writes data to the VFD. The Sasem VFD is 2x16 characters
361 * and requires data in 9 consecutive USB interrupt packets,
362 * each packet carrying 8 bytes.
363 */
vfd_write(struct file * file,const char * buf,size_t n_bytes,loff_t * pos)364 static ssize_t vfd_write(struct file *file, const char *buf,
365 size_t n_bytes, loff_t *pos)
366 {
367 int i;
368 int retval = 0;
369 struct sasem_context *context;
370 int *data_buf = NULL;
371
372 context = (struct sasem_context *) file->private_data;
373 if (!context) {
374 pr_err("%s: no context for device\n", __func__);
375 return -ENODEV;
376 }
377
378 mutex_lock(&context->ctx_lock);
379
380 if (!context->dev_present) {
381 pr_err("%s: no Sasem device present\n", __func__);
382 retval = -ENODEV;
383 goto exit;
384 }
385
386 if (n_bytes <= 0 || n_bytes > SASEM_DATA_BUF_SZ) {
387 dev_err(&context->dev->dev, "%s: invalid payload size\n",
388 __func__);
389 retval = -EINVAL;
390 goto exit;
391 }
392
393 data_buf = memdup_user(buf, n_bytes);
394 if (IS_ERR(data_buf)) {
395 retval = PTR_ERR(data_buf);
396 goto exit;
397 }
398
399 memcpy(context->tx.data_buf, data_buf, n_bytes);
400
401 /* Pad with spaces */
402 for (i = n_bytes; i < SASEM_DATA_BUF_SZ; ++i)
403 context->tx.data_buf[i] = ' ';
404
405 /* Nine 8 byte packets to be sent */
406 /* NOTE: "\x07\x01\0\0\0\0\0\0" or "\x0c\0\0\0\0\0\0\0"
407 * will clear the VFD */
408 for (i = 0; i < 9; i++) {
409 switch (i) {
410 case 0:
411 memcpy(context->usb_tx_buf, "\x07\0\0\0\0\0\0\0", 8);
412 context->usb_tx_buf[1] = (context->vfd_contrast) ?
413 (0x2B - (context->vfd_contrast - 1) / 250)
414 : 0x2B;
415 break;
416 case 1:
417 memcpy(context->usb_tx_buf, "\x09\x01\0\0\0\0\0\0", 8);
418 break;
419 case 2:
420 memcpy(context->usb_tx_buf, "\x0b\x01\0\0\0\0\0\0", 8);
421 break;
422 case 3:
423 memcpy(context->usb_tx_buf, context->tx.data_buf, 8);
424 break;
425 case 4:
426 memcpy(context->usb_tx_buf,
427 context->tx.data_buf + 8, 8);
428 break;
429 case 5:
430 memcpy(context->usb_tx_buf, "\x09\x01\0\0\0\0\0\0", 8);
431 break;
432 case 6:
433 memcpy(context->usb_tx_buf, "\x0b\x02\0\0\0\0\0\0", 8);
434 break;
435 case 7:
436 memcpy(context->usb_tx_buf,
437 context->tx.data_buf + 16, 8);
438 break;
439 case 8:
440 memcpy(context->usb_tx_buf,
441 context->tx.data_buf + 24, 8);
442 break;
443 }
444 retval = send_packet(context);
445 if (retval) {
446 dev_err(&context->dev->dev,
447 "%s: send packet failed for packet #%d\n",
448 __func__, i);
449 goto exit;
450 }
451 }
452 exit:
453
454 mutex_unlock(&context->ctx_lock);
455 kfree(data_buf);
456
457 return (!retval) ? n_bytes : retval;
458 }
459
460 /**
461 * Callback function for USB core API: transmit data
462 */
usb_tx_callback(struct urb * urb)463 static void usb_tx_callback(struct urb *urb)
464 {
465 struct sasem_context *context;
466
467 if (!urb)
468 return;
469 context = (struct sasem_context *) urb->context;
470 if (!context)
471 return;
472
473 context->tx.status = urb->status;
474
475 /* notify waiters that write has finished */
476 atomic_set(&context->tx.busy, 0);
477 complete(&context->tx.finished);
478
479 return;
480 }
481
482 /**
483 * Called by lirc_dev when the application opens /dev/lirc
484 */
ir_open(void * data)485 static int ir_open(void *data)
486 {
487 int retval = 0;
488 struct sasem_context *context;
489
490 /* prevent races with disconnect */
491 mutex_lock(&disconnect_lock);
492
493 context = (struct sasem_context *) data;
494
495 mutex_lock(&context->ctx_lock);
496
497 if (context->ir_isopen) {
498 dev_err(&context->dev->dev, "%s: IR port is already open\n",
499 __func__);
500 retval = -EBUSY;
501 goto exit;
502 }
503
504 usb_fill_int_urb(context->rx_urb, context->dev,
505 usb_rcvintpipe(context->dev,
506 context->rx_endpoint->bEndpointAddress),
507 context->usb_rx_buf, sizeof(context->usb_rx_buf),
508 usb_rx_callback, context, context->rx_endpoint->bInterval);
509
510 retval = usb_submit_urb(context->rx_urb, GFP_KERNEL);
511
512 if (retval)
513 dev_err(&context->dev->dev,
514 "%s: usb_submit_urb failed for ir_open (%d)\n",
515 __func__, retval);
516 else {
517 context->ir_isopen = 1;
518 dev_info(&context->dev->dev, "IR port opened\n");
519 }
520
521 exit:
522 mutex_unlock(&context->ctx_lock);
523
524 mutex_unlock(&disconnect_lock);
525 return retval;
526 }
527
528 /**
529 * Called by lirc_dev when the application closes /dev/lirc
530 */
ir_close(void * data)531 static void ir_close(void *data)
532 {
533 struct sasem_context *context;
534
535 context = (struct sasem_context *)data;
536 if (!context) {
537 pr_err("%s: no context for device\n", __func__);
538 return;
539 }
540
541 mutex_lock(&context->ctx_lock);
542
543 usb_kill_urb(context->rx_urb);
544 context->ir_isopen = 0;
545 pr_info("IR port closed\n");
546
547 if (!context->dev_present) {
548
549 /*
550 * Device disconnected while IR port was
551 * still open. Driver was not deregistered
552 * at disconnect time, so do it now.
553 */
554 deregister_from_lirc(context);
555
556 if (!context->vfd_isopen) {
557
558 mutex_unlock(&context->ctx_lock);
559 delete_context(context);
560 return;
561 }
562 /* If VFD port is open, context will be deleted by vfd_close */
563 }
564
565 mutex_unlock(&context->ctx_lock);
566 return;
567 }
568
569 /**
570 * Process the incoming packet
571 */
incoming_packet(struct sasem_context * context,struct urb * urb)572 static void incoming_packet(struct sasem_context *context,
573 struct urb *urb)
574 {
575 int len = urb->actual_length;
576 unsigned char *buf = urb->transfer_buffer;
577 long ms;
578 struct timeval tv;
579 int i;
580
581 if (len != 8) {
582 dev_warn(&context->dev->dev,
583 "%s: invalid incoming packet size (%d)\n",
584 __func__, len);
585 return;
586 }
587
588 if (debug) {
589 printk(KERN_INFO "Incoming data: ");
590 for (i = 0; i < 8; ++i)
591 printk(KERN_CONT "%02x ", buf[i]);
592 printk(KERN_CONT "\n");
593 }
594
595 /*
596 * Lirc could deal with the repeat code, but we really need to block it
597 * if it arrives too late. Otherwise we could repeat the wrong code.
598 */
599
600 /* get the time since the last button press */
601 do_gettimeofday(&tv);
602 ms = (tv.tv_sec - context->presstime.tv_sec) * 1000 +
603 (tv.tv_usec - context->presstime.tv_usec) / 1000;
604
605 if (memcmp(buf, "\x08\0\0\0\0\0\0\0", 8) == 0) {
606 /*
607 * the repeat code is being sent, so we copy
608 * the old code to LIRC
609 */
610
611 /*
612 * NOTE: Only if the last code was less than 250ms ago
613 * - no one should be able to push another (undetected) button
614 * in that time and then get a false repeat of the previous
615 * press but it is long enough for a genuine repeat
616 */
617 if ((ms < 250) && (context->codesaved != 0)) {
618 memcpy(buf, &context->lastcode, 8);
619 context->presstime.tv_sec = tv.tv_sec;
620 context->presstime.tv_usec = tv.tv_usec;
621 }
622 } else {
623 /* save the current valid code for repeats */
624 memcpy(&context->lastcode, buf, 8);
625 /*
626 * set flag to signal a valid code was save;
627 * just for safety reasons
628 */
629 context->codesaved = 1;
630 context->presstime.tv_sec = tv.tv_sec;
631 context->presstime.tv_usec = tv.tv_usec;
632 }
633
634 lirc_buffer_write(context->driver->rbuf, buf);
635 wake_up(&context->driver->rbuf->wait_poll);
636 }
637
638 /**
639 * Callback function for USB core API: receive data
640 */
usb_rx_callback(struct urb * urb)641 static void usb_rx_callback(struct urb *urb)
642 {
643 struct sasem_context *context;
644
645 if (!urb)
646 return;
647 context = (struct sasem_context *) urb->context;
648 if (!context)
649 return;
650
651 switch (urb->status) {
652
653 case -ENOENT: /* usbcore unlink successful! */
654 return;
655
656 case 0:
657 if (context->ir_isopen)
658 incoming_packet(context, urb);
659 break;
660
661 default:
662 dev_warn(&urb->dev->dev, "%s: status (%d): ignored",
663 __func__, urb->status);
664 break;
665 }
666
667 usb_submit_urb(context->rx_urb, GFP_ATOMIC);
668 return;
669 }
670
671
672
673 /**
674 * Callback function for USB core API: Probe
675 */
sasem_probe(struct usb_interface * interface,const struct usb_device_id * id)676 static int sasem_probe(struct usb_interface *interface,
677 const struct usb_device_id *id)
678 {
679 struct usb_device *dev = NULL;
680 struct usb_host_interface *iface_desc = NULL;
681 struct usb_endpoint_descriptor *rx_endpoint = NULL;
682 struct usb_endpoint_descriptor *tx_endpoint = NULL;
683 struct urb *rx_urb = NULL;
684 struct urb *tx_urb = NULL;
685 struct lirc_driver *driver = NULL;
686 struct lirc_buffer *rbuf = NULL;
687 int lirc_minor = 0;
688 int num_endpoints;
689 int retval = 0;
690 int vfd_ep_found;
691 int ir_ep_found;
692 int alloc_status;
693 struct sasem_context *context = NULL;
694 int i;
695
696 dev_info(&interface->dev, "%s: found Sasem device\n", __func__);
697
698
699 dev = usb_get_dev(interface_to_usbdev(interface));
700 iface_desc = interface->cur_altsetting;
701 num_endpoints = iface_desc->desc.bNumEndpoints;
702
703 /*
704 * Scan the endpoint list and set:
705 * first input endpoint = IR endpoint
706 * first output endpoint = VFD endpoint
707 */
708
709 ir_ep_found = 0;
710 vfd_ep_found = 0;
711
712 for (i = 0; i < num_endpoints && !(ir_ep_found && vfd_ep_found); ++i) {
713
714 struct usb_endpoint_descriptor *ep;
715 int ep_dir;
716 int ep_type;
717 ep = &iface_desc->endpoint [i].desc;
718 ep_dir = ep->bEndpointAddress & USB_ENDPOINT_DIR_MASK;
719 ep_type = ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
720
721 if (!ir_ep_found &&
722 ep_dir == USB_DIR_IN &&
723 ep_type == USB_ENDPOINT_XFER_INT) {
724
725 rx_endpoint = ep;
726 ir_ep_found = 1;
727 if (debug)
728 dev_info(&interface->dev,
729 "%s: found IR endpoint\n", __func__);
730
731 } else if (!vfd_ep_found &&
732 ep_dir == USB_DIR_OUT &&
733 ep_type == USB_ENDPOINT_XFER_INT) {
734
735 tx_endpoint = ep;
736 vfd_ep_found = 1;
737 if (debug)
738 dev_info(&interface->dev,
739 "%s: found VFD endpoint\n", __func__);
740 }
741 }
742
743 /* Input endpoint is mandatory */
744 if (!ir_ep_found) {
745 dev_err(&interface->dev,
746 "%s: no valid input (IR) endpoint found.\n", __func__);
747 retval = -ENODEV;
748 goto exit;
749 }
750
751 if (!vfd_ep_found)
752 dev_info(&interface->dev,
753 "%s: no valid output (VFD) endpoint found.\n",
754 __func__);
755
756
757 /* Allocate memory */
758 alloc_status = 0;
759
760 context = kzalloc(sizeof(struct sasem_context), GFP_KERNEL);
761 if (!context) {
762 alloc_status = 1;
763 goto alloc_status_switch;
764 }
765 driver = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL);
766 if (!driver) {
767 alloc_status = 2;
768 goto alloc_status_switch;
769 }
770 rbuf = kmalloc(sizeof(struct lirc_buffer), GFP_KERNEL);
771 if (!rbuf) {
772 alloc_status = 3;
773 goto alloc_status_switch;
774 }
775 if (lirc_buffer_init(rbuf, BUF_CHUNK_SIZE, BUF_SIZE)) {
776 dev_err(&interface->dev,
777 "%s: lirc_buffer_init failed\n", __func__);
778 alloc_status = 4;
779 goto alloc_status_switch;
780 }
781 rx_urb = usb_alloc_urb(0, GFP_KERNEL);
782 if (!rx_urb) {
783 dev_err(&interface->dev,
784 "%s: usb_alloc_urb failed for IR urb\n", __func__);
785 alloc_status = 5;
786 goto alloc_status_switch;
787 }
788 if (vfd_ep_found) {
789 tx_urb = usb_alloc_urb(0, GFP_KERNEL);
790 if (!tx_urb) {
791 dev_err(&interface->dev,
792 "%s: usb_alloc_urb failed for VFD urb",
793 __func__);
794 alloc_status = 6;
795 goto alloc_status_switch;
796 }
797 }
798
799 mutex_init(&context->ctx_lock);
800
801 strcpy(driver->name, MOD_NAME);
802 driver->minor = -1;
803 driver->code_length = 64;
804 driver->sample_rate = 0;
805 driver->features = LIRC_CAN_REC_LIRCCODE;
806 driver->data = context;
807 driver->rbuf = rbuf;
808 driver->set_use_inc = ir_open;
809 driver->set_use_dec = ir_close;
810 driver->dev = &interface->dev;
811 driver->owner = THIS_MODULE;
812
813 mutex_lock(&context->ctx_lock);
814
815 lirc_minor = lirc_register_driver(driver);
816 if (lirc_minor < 0) {
817 dev_err(&interface->dev,
818 "%s: lirc_register_driver failed\n", __func__);
819 alloc_status = 7;
820 retval = lirc_minor;
821 goto unlock;
822 } else
823 dev_info(&interface->dev,
824 "%s: Registered Sasem driver (minor:%d)\n",
825 __func__, lirc_minor);
826
827 /* Needed while unregistering! */
828 driver->minor = lirc_minor;
829
830 context->dev = dev;
831 context->dev_present = 1;
832 context->rx_endpoint = rx_endpoint;
833 context->rx_urb = rx_urb;
834 if (vfd_ep_found) {
835 context->tx_endpoint = tx_endpoint;
836 context->tx_urb = tx_urb;
837 context->vfd_contrast = 1000; /* range 0 - 1000 */
838 }
839 context->driver = driver;
840
841 usb_set_intfdata(interface, context);
842
843 if (vfd_ep_found) {
844
845 if (debug)
846 dev_info(&interface->dev,
847 "Registering VFD with sysfs\n");
848 if (usb_register_dev(interface, &sasem_class))
849 /* Not a fatal error, so ignore */
850 dev_info(&interface->dev,
851 "%s: could not get a minor number for VFD\n",
852 __func__);
853 }
854
855 dev_info(&interface->dev,
856 "%s: Sasem device on usb<%d:%d> initialized\n",
857 __func__, dev->bus->busnum, dev->devnum);
858 unlock:
859 mutex_unlock(&context->ctx_lock);
860
861 alloc_status_switch:
862 switch (alloc_status) {
863
864 case 7:
865 if (vfd_ep_found)
866 usb_free_urb(tx_urb);
867 case 6:
868 usb_free_urb(rx_urb);
869 case 5:
870 lirc_buffer_free(rbuf);
871 case 4:
872 kfree(rbuf);
873 case 3:
874 kfree(driver);
875 case 2:
876 kfree(context);
877 context = NULL;
878 case 1:
879 if (retval == 0)
880 retval = -ENOMEM;
881 }
882
883 exit:
884 return retval;
885 }
886
887 /**
888 * Callback function for USB core API: disconnect
889 */
sasem_disconnect(struct usb_interface * interface)890 static void sasem_disconnect(struct usb_interface *interface)
891 {
892 struct sasem_context *context;
893
894 /* prevent races with ir_open()/vfd_open() */
895 mutex_lock(&disconnect_lock);
896
897 context = usb_get_intfdata(interface);
898 mutex_lock(&context->ctx_lock);
899
900 dev_info(&interface->dev, "%s: Sasem device disconnected\n",
901 __func__);
902
903 usb_set_intfdata(interface, NULL);
904 context->dev_present = 0;
905
906 /* Stop reception */
907 usb_kill_urb(context->rx_urb);
908
909 /* Abort ongoing write */
910 if (atomic_read(&context->tx.busy)) {
911
912 usb_kill_urb(context->tx_urb);
913 wait_for_completion(&context->tx.finished);
914 }
915
916 /* De-register from lirc_dev if IR port is not open */
917 if (!context->ir_isopen)
918 deregister_from_lirc(context);
919
920 usb_deregister_dev(interface, &sasem_class);
921
922 mutex_unlock(&context->ctx_lock);
923
924 if (!context->ir_isopen && !context->vfd_isopen)
925 delete_context(context);
926
927 mutex_unlock(&disconnect_lock);
928 }
929
930 module_usb_driver(sasem_driver);
931