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staging: delete non-required instances of include <linux/init.h>
[deliverable/linux.git] / drivers / staging / media / lirc / lirc_sasem.c
1 /*
2 * lirc_sasem.c - USB remote support for LIRC
3 * Version 0.5
4 *
5 * Copyright (C) 2004-2005 Oliver Stabel <oliver.stabel@gmx.de>
6 * Tim Davies <tim@opensystems.net.au>
7 *
8 * This driver was derived from:
9 * Venky Raju <dev@venky.ws>
10 * "lirc_imon - "LIRC/VFD driver for Ahanix/Soundgraph IMON IR/VFD"
11 * Paul Miller <pmiller9@users.sourceforge.net>'s 2003-2004
12 * "lirc_atiusb - USB remote support for LIRC"
13 * Culver Consulting Services <henry@culcon.com>'s 2003
14 * "Sasem OnAir VFD/IR USB driver"
15 *
16 *
17 * NOTE - The LCDproc iMon driver should work with this module. More info at
18 * http://www.frogstorm.info/sasem
19 */
20
21 /*
22 * This program is free software; you can redistribute it and/or modify
23 * it under the terms of the GNU General Public License as published by
24 * the Free Software Foundation; either version 2 of the License, or
25 * (at your option) any later version.
26 *
27 * This program is distributed in the hope that it will be useful,
28 * but WITHOUT ANY WARRANTY; without even the implied warranty of
29 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
30 * GNU General Public License for more details.
31 *
32 * You should have received a copy of the GNU General Public License
33 * along with this program; if not, write to the Free Software
34 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
35 */
36
37 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
38
39 #include <linux/errno.h>
40 #include <linux/kernel.h>
41 #include <linux/module.h>
42 #include <linux/slab.h>
43 #include <linux/uaccess.h>
44 #include <linux/usb.h>
45
46 #include <media/lirc.h>
47 #include <media/lirc_dev.h>
48
49
50 #define MOD_AUTHOR "Oliver Stabel <oliver.stabel@gmx.de>, " \
51 "Tim Davies <tim@opensystems.net.au>"
52 #define MOD_DESC "USB Driver for Sasem Remote Controller V1.1"
53 #define MOD_NAME "lirc_sasem"
54 #define MOD_VERSION "0.5"
55
56 #define VFD_MINOR_BASE 144 /* Same as LCD */
57 #define DEVICE_NAME "lcd%d"
58
59 #define BUF_CHUNK_SIZE 8
60 #define BUF_SIZE 128
61
62 #define IOCTL_LCD_CONTRAST 1
63
64 /*** P R O T O T Y P E S ***/
65
66 /* USB Callback prototypes */
67 static int sasem_probe(struct usb_interface *interface,
68 const struct usb_device_id *id);
69 static void sasem_disconnect(struct usb_interface *interface);
70 static void usb_rx_callback(struct urb *urb);
71 static void usb_tx_callback(struct urb *urb);
72
73 /* VFD file_operations function prototypes */
74 static int vfd_open(struct inode *inode, struct file *file);
75 static long vfd_ioctl(struct file *file, unsigned cmd, unsigned long arg);
76 static int vfd_close(struct inode *inode, struct file *file);
77 static ssize_t vfd_write(struct file *file, const char *buf,
78 size_t n_bytes, loff_t *pos);
79
80 /* LIRC driver function prototypes */
81 static int ir_open(void *data);
82 static void ir_close(void *data);
83
84 /*** G L O B A L S ***/
85 #define SASEM_DATA_BUF_SZ 32
86
87 struct sasem_context {
88
89 struct usb_device *dev;
90 int vfd_isopen; /* VFD port has been opened */
91 unsigned int vfd_contrast; /* VFD contrast */
92 int ir_isopen; /* IR port has been opened */
93 int dev_present; /* USB device presence */
94 struct mutex ctx_lock; /* to lock this object */
95 wait_queue_head_t remove_ok; /* For unexpected USB disconnects */
96
97 struct lirc_driver *driver;
98 struct usb_endpoint_descriptor *rx_endpoint;
99 struct usb_endpoint_descriptor *tx_endpoint;
100 struct urb *rx_urb;
101 struct urb *tx_urb;
102 unsigned char usb_rx_buf[8];
103 unsigned char usb_tx_buf[8];
104
105 struct tx_t {
106 unsigned char data_buf[SASEM_DATA_BUF_SZ]; /* user data
107 * buffer */
108 struct completion finished; /* wait for write to finish */
109 atomic_t busy; /* write in progress */
110 int status; /* status of tx completion */
111 } tx;
112
113 /* for dealing with repeat codes (wish there was a toggle bit!) */
114 struct timeval presstime;
115 char lastcode[8];
116 int codesaved;
117 };
118
119 /* VFD file operations */
120 static const struct file_operations vfd_fops = {
121 .owner = THIS_MODULE,
122 .open = &vfd_open,
123 .write = &vfd_write,
124 .unlocked_ioctl = &vfd_ioctl,
125 .release = &vfd_close,
126 .llseek = noop_llseek,
127 };
128
129 /* USB Device ID for Sasem USB Control Board */
130 static struct usb_device_id sasem_usb_id_table[] = {
131 /* Sasem USB Control Board */
132 { USB_DEVICE(0x11ba, 0x0101) },
133 /* Terminating entry */
134 {}
135 };
136
137 /* USB Device data */
138 static struct usb_driver sasem_driver = {
139 .name = MOD_NAME,
140 .probe = sasem_probe,
141 .disconnect = sasem_disconnect,
142 .id_table = sasem_usb_id_table,
143 };
144
145 static struct usb_class_driver sasem_class = {
146 .name = DEVICE_NAME,
147 .fops = &vfd_fops,
148 .minor_base = VFD_MINOR_BASE,
149 };
150
151 /* to prevent races between open() and disconnect() */
152 static DEFINE_MUTEX(disconnect_lock);
153
154 static int debug;
155
156
157 /*** M O D U L E C O D E ***/
158
159 MODULE_AUTHOR(MOD_AUTHOR);
160 MODULE_DESCRIPTION(MOD_DESC);
161 MODULE_LICENSE("GPL");
162 module_param(debug, int, S_IRUGO | S_IWUSR);
163 MODULE_PARM_DESC(debug, "Debug messages: 0=no, 1=yes (default: no)");
164
165 static void delete_context(struct sasem_context *context)
166 {
167 usb_free_urb(context->tx_urb); /* VFD */
168 usb_free_urb(context->rx_urb); /* IR */
169 lirc_buffer_free(context->driver->rbuf);
170 kfree(context->driver->rbuf);
171 kfree(context->driver);
172 kfree(context);
173
174 if (debug)
175 pr_info("%s: context deleted\n", __func__);
176 }
177
178 static void deregister_from_lirc(struct sasem_context *context)
179 {
180 int retval;
181 int minor = context->driver->minor;
182
183 retval = lirc_unregister_driver(minor);
184 if (retval)
185 pr_err("%s: unable to deregister from lirc (%d)\n",
186 __func__, retval);
187 else
188 pr_info("Deregistered Sasem driver (minor:%d)\n", minor);
189
190 }
191
192 /**
193 * Called when the VFD device (e.g. /dev/usb/lcd)
194 * is opened by the application.
195 */
196 static int vfd_open(struct inode *inode, struct file *file)
197 {
198 struct usb_interface *interface;
199 struct sasem_context *context = NULL;
200 int subminor;
201 int retval = 0;
202
203 /* prevent races with disconnect */
204 mutex_lock(&disconnect_lock);
205
206 subminor = iminor(inode);
207 interface = usb_find_interface(&sasem_driver, subminor);
208 if (!interface) {
209 pr_err("%s: could not find interface for minor %d\n",
210 __func__, subminor);
211 retval = -ENODEV;
212 goto exit;
213 }
214 context = usb_get_intfdata(interface);
215
216 if (!context) {
217 dev_err(&interface->dev,
218 "%s: no context found for minor %d\n",
219 __func__, subminor);
220 retval = -ENODEV;
221 goto exit;
222 }
223
224 mutex_lock(&context->ctx_lock);
225
226 if (context->vfd_isopen) {
227 dev_err(&interface->dev,
228 "%s: VFD port is already open", __func__);
229 retval = -EBUSY;
230 } else {
231 context->vfd_isopen = 1;
232 file->private_data = context;
233 dev_info(&interface->dev, "VFD port opened\n");
234 }
235
236 mutex_unlock(&context->ctx_lock);
237
238 exit:
239 mutex_unlock(&disconnect_lock);
240 return retval;
241 }
242
243 /**
244 * Called when the VFD device (e.g. /dev/usb/lcd)
245 * is closed by the application.
246 */
247 static long vfd_ioctl(struct file *file, unsigned cmd, unsigned long arg)
248 {
249 struct sasem_context *context = NULL;
250
251 context = (struct sasem_context *) file->private_data;
252
253 if (!context) {
254 pr_err("%s: no context for device\n", __func__);
255 return -ENODEV;
256 }
257
258 mutex_lock(&context->ctx_lock);
259
260 switch (cmd) {
261 case IOCTL_LCD_CONTRAST:
262 if (arg > 1000)
263 arg = 1000;
264 context->vfd_contrast = (unsigned int)arg;
265 break;
266 default:
267 pr_info("Unknown IOCTL command\n");
268 mutex_unlock(&context->ctx_lock);
269 return -ENOIOCTLCMD; /* not supported */
270 }
271
272 mutex_unlock(&context->ctx_lock);
273 return 0;
274 }
275
276 /**
277 * Called when the VFD device (e.g. /dev/usb/lcd)
278 * is closed by the application.
279 */
280 static int vfd_close(struct inode *inode, struct file *file)
281 {
282 struct sasem_context *context = NULL;
283 int retval = 0;
284
285 context = (struct sasem_context *) file->private_data;
286
287 if (!context) {
288 pr_err("%s: no context for device\n", __func__);
289 return -ENODEV;
290 }
291
292 mutex_lock(&context->ctx_lock);
293
294 if (!context->vfd_isopen) {
295 dev_err(&context->dev->dev, "%s: VFD is not open\n", __func__);
296 retval = -EIO;
297 } else {
298 context->vfd_isopen = 0;
299 dev_info(&context->dev->dev, "VFD port closed\n");
300 if (!context->dev_present && !context->ir_isopen) {
301
302 /* Device disconnected before close and IR port is
303 * not open. If IR port is open, context will be
304 * deleted by ir_close. */
305 mutex_unlock(&context->ctx_lock);
306 delete_context(context);
307 return retval;
308 }
309 }
310
311 mutex_unlock(&context->ctx_lock);
312 return retval;
313 }
314
315 /**
316 * Sends a packet to the VFD.
317 */
318 static int send_packet(struct sasem_context *context)
319 {
320 unsigned int pipe;
321 int interval = 0;
322 int retval = 0;
323
324 pipe = usb_sndintpipe(context->dev,
325 context->tx_endpoint->bEndpointAddress);
326 interval = context->tx_endpoint->bInterval;
327
328 usb_fill_int_urb(context->tx_urb, context->dev, pipe,
329 context->usb_tx_buf, sizeof(context->usb_tx_buf),
330 usb_tx_callback, context, interval);
331
332 context->tx_urb->actual_length = 0;
333
334 init_completion(&context->tx.finished);
335 atomic_set(&(context->tx.busy), 1);
336
337 retval = usb_submit_urb(context->tx_urb, GFP_KERNEL);
338 if (retval) {
339 atomic_set(&(context->tx.busy), 0);
340 dev_err(&context->dev->dev, "%s: error submitting urb (%d)\n",
341 __func__, retval);
342 } else {
343 /* Wait for transmission to complete (or abort) */
344 mutex_unlock(&context->ctx_lock);
345 wait_for_completion(&context->tx.finished);
346 mutex_lock(&context->ctx_lock);
347
348 retval = context->tx.status;
349 if (retval)
350 dev_err(&context->dev->dev,
351 "%s: packet tx failed (%d)\n",
352 __func__, retval);
353 }
354
355 return retval;
356 }
357
358 /**
359 * Writes data to the VFD. The Sasem VFD is 2x16 characters
360 * and requires data in 9 consecutive USB interrupt packets,
361 * each packet carrying 8 bytes.
362 */
363 static ssize_t vfd_write(struct file *file, const char *buf,
364 size_t n_bytes, loff_t *pos)
365 {
366 int i;
367 int retval = 0;
368 struct sasem_context *context;
369 int *data_buf = NULL;
370
371 context = (struct sasem_context *) file->private_data;
372 if (!context) {
373 pr_err("%s: no context for device\n", __func__);
374 return -ENODEV;
375 }
376
377 mutex_lock(&context->ctx_lock);
378
379 if (!context->dev_present) {
380 pr_err("%s: no Sasem device present\n", __func__);
381 retval = -ENODEV;
382 goto exit;
383 }
384
385 if (n_bytes <= 0 || n_bytes > SASEM_DATA_BUF_SZ) {
386 dev_err(&context->dev->dev, "%s: invalid payload size\n",
387 __func__);
388 retval = -EINVAL;
389 goto exit;
390 }
391
392 data_buf = memdup_user(buf, n_bytes);
393 if (IS_ERR(data_buf)) {
394 retval = PTR_ERR(data_buf);
395 goto exit;
396 }
397
398 memcpy(context->tx.data_buf, data_buf, n_bytes);
399
400 /* Pad with spaces */
401 for (i = n_bytes; i < SASEM_DATA_BUF_SZ; ++i)
402 context->tx.data_buf[i] = ' ';
403
404 /* Nine 8 byte packets to be sent */
405 /* NOTE: "\x07\x01\0\0\0\0\0\0" or "\x0c\0\0\0\0\0\0\0"
406 * will clear the VFD */
407 for (i = 0; i < 9; i++) {
408 switch (i) {
409 case 0:
410 memcpy(context->usb_tx_buf, "\x07\0\0\0\0\0\0\0", 8);
411 context->usb_tx_buf[1] = (context->vfd_contrast) ?
412 (0x2B - (context->vfd_contrast - 1) / 250)
413 : 0x2B;
414 break;
415 case 1:
416 memcpy(context->usb_tx_buf, "\x09\x01\0\0\0\0\0\0", 8);
417 break;
418 case 2:
419 memcpy(context->usb_tx_buf, "\x0b\x01\0\0\0\0\0\0", 8);
420 break;
421 case 3:
422 memcpy(context->usb_tx_buf, context->tx.data_buf, 8);
423 break;
424 case 4:
425 memcpy(context->usb_tx_buf,
426 context->tx.data_buf + 8, 8);
427 break;
428 case 5:
429 memcpy(context->usb_tx_buf, "\x09\x01\0\0\0\0\0\0", 8);
430 break;
431 case 6:
432 memcpy(context->usb_tx_buf, "\x0b\x02\0\0\0\0\0\0", 8);
433 break;
434 case 7:
435 memcpy(context->usb_tx_buf,
436 context->tx.data_buf + 16, 8);
437 break;
438 case 8:
439 memcpy(context->usb_tx_buf,
440 context->tx.data_buf + 24, 8);
441 break;
442 }
443 retval = send_packet(context);
444 if (retval) {
445 dev_err(&context->dev->dev,
446 "%s: send packet failed for packet #%d\n",
447 __func__, i);
448 goto exit;
449 }
450 }
451 exit:
452
453 mutex_unlock(&context->ctx_lock);
454 kfree(data_buf);
455
456 return (!retval) ? n_bytes : retval;
457 }
458
459 /**
460 * Callback function for USB core API: transmit data
461 */
462 static void usb_tx_callback(struct urb *urb)
463 {
464 struct sasem_context *context;
465
466 if (!urb)
467 return;
468 context = (struct sasem_context *) urb->context;
469 if (!context)
470 return;
471
472 context->tx.status = urb->status;
473
474 /* notify waiters that write has finished */
475 atomic_set(&context->tx.busy, 0);
476 complete(&context->tx.finished);
477
478 return;
479 }
480
481 /**
482 * Called by lirc_dev when the application opens /dev/lirc
483 */
484 static int ir_open(void *data)
485 {
486 int retval = 0;
487 struct sasem_context *context;
488
489 /* prevent races with disconnect */
490 mutex_lock(&disconnect_lock);
491
492 context = (struct sasem_context *) data;
493
494 mutex_lock(&context->ctx_lock);
495
496 if (context->ir_isopen) {
497 dev_err(&context->dev->dev, "%s: IR port is already open\n",
498 __func__);
499 retval = -EBUSY;
500 goto exit;
501 }
502
503 usb_fill_int_urb(context->rx_urb, context->dev,
504 usb_rcvintpipe(context->dev,
505 context->rx_endpoint->bEndpointAddress),
506 context->usb_rx_buf, sizeof(context->usb_rx_buf),
507 usb_rx_callback, context, context->rx_endpoint->bInterval);
508
509 retval = usb_submit_urb(context->rx_urb, GFP_KERNEL);
510
511 if (retval)
512 dev_err(&context->dev->dev,
513 "%s: usb_submit_urb failed for ir_open (%d)\n",
514 __func__, retval);
515 else {
516 context->ir_isopen = 1;
517 dev_info(&context->dev->dev, "IR port opened\n");
518 }
519
520 exit:
521 mutex_unlock(&context->ctx_lock);
522
523 mutex_unlock(&disconnect_lock);
524 return retval;
525 }
526
527 /**
528 * Called by lirc_dev when the application closes /dev/lirc
529 */
530 static void ir_close(void *data)
531 {
532 struct sasem_context *context;
533
534 context = (struct sasem_context *)data;
535 if (!context) {
536 pr_err("%s: no context for device\n", __func__);
537 return;
538 }
539
540 mutex_lock(&context->ctx_lock);
541
542 usb_kill_urb(context->rx_urb);
543 context->ir_isopen = 0;
544 pr_info("IR port closed\n");
545
546 if (!context->dev_present) {
547
548 /*
549 * Device disconnected while IR port was
550 * still open. Driver was not deregistered
551 * at disconnect time, so do it now.
552 */
553 deregister_from_lirc(context);
554
555 if (!context->vfd_isopen) {
556
557 mutex_unlock(&context->ctx_lock);
558 delete_context(context);
559 return;
560 }
561 /* If VFD port is open, context will be deleted by vfd_close */
562 }
563
564 mutex_unlock(&context->ctx_lock);
565 return;
566 }
567
568 /**
569 * Process the incoming packet
570 */
571 static void incoming_packet(struct sasem_context *context,
572 struct urb *urb)
573 {
574 int len = urb->actual_length;
575 unsigned char *buf = urb->transfer_buffer;
576 long ms;
577 struct timeval tv;
578 int i;
579
580 if (len != 8) {
581 dev_warn(&context->dev->dev,
582 "%s: invalid incoming packet size (%d)\n",
583 __func__, len);
584 return;
585 }
586
587 if (debug) {
588 printk(KERN_INFO "Incoming data: ");
589 for (i = 0; i < 8; ++i)
590 printk(KERN_CONT "%02x ", buf[i]);
591 printk(KERN_CONT "\n");
592 }
593
594 /*
595 * Lirc could deal with the repeat code, but we really need to block it
596 * if it arrives too late. Otherwise we could repeat the wrong code.
597 */
598
599 /* get the time since the last button press */
600 do_gettimeofday(&tv);
601 ms = (tv.tv_sec - context->presstime.tv_sec) * 1000 +
602 (tv.tv_usec - context->presstime.tv_usec) / 1000;
603
604 if (memcmp(buf, "\x08\0\0\0\0\0\0\0", 8) == 0) {
605 /*
606 * the repeat code is being sent, so we copy
607 * the old code to LIRC
608 */
609
610 /*
611 * NOTE: Only if the last code was less than 250ms ago
612 * - no one should be able to push another (undetected) button
613 * in that time and then get a false repeat of the previous
614 * press but it is long enough for a genuine repeat
615 */
616 if ((ms < 250) && (context->codesaved != 0)) {
617 memcpy(buf, &context->lastcode, 8);
618 context->presstime.tv_sec = tv.tv_sec;
619 context->presstime.tv_usec = tv.tv_usec;
620 }
621 } else {
622 /* save the current valid code for repeats */
623 memcpy(&context->lastcode, buf, 8);
624 /*
625 * set flag to signal a valid code was save;
626 * just for safety reasons
627 */
628 context->codesaved = 1;
629 context->presstime.tv_sec = tv.tv_sec;
630 context->presstime.tv_usec = tv.tv_usec;
631 }
632
633 lirc_buffer_write(context->driver->rbuf, buf);
634 wake_up(&context->driver->rbuf->wait_poll);
635 }
636
637 /**
638 * Callback function for USB core API: receive data
639 */
640 static void usb_rx_callback(struct urb *urb)
641 {
642 struct sasem_context *context;
643
644 if (!urb)
645 return;
646 context = (struct sasem_context *) urb->context;
647 if (!context)
648 return;
649
650 switch (urb->status) {
651
652 case -ENOENT: /* usbcore unlink successful! */
653 return;
654
655 case 0:
656 if (context->ir_isopen)
657 incoming_packet(context, urb);
658 break;
659
660 default:
661 dev_warn(&urb->dev->dev, "%s: status (%d): ignored",
662 __func__, urb->status);
663 break;
664 }
665
666 usb_submit_urb(context->rx_urb, GFP_ATOMIC);
667 return;
668 }
669
670
671
672 /**
673 * Callback function for USB core API: Probe
674 */
675 static int sasem_probe(struct usb_interface *interface,
676 const struct usb_device_id *id)
677 {
678 struct usb_device *dev = NULL;
679 struct usb_host_interface *iface_desc = NULL;
680 struct usb_endpoint_descriptor *rx_endpoint = NULL;
681 struct usb_endpoint_descriptor *tx_endpoint = NULL;
682 struct urb *rx_urb = NULL;
683 struct urb *tx_urb = NULL;
684 struct lirc_driver *driver = NULL;
685 struct lirc_buffer *rbuf = NULL;
686 int lirc_minor = 0;
687 int num_endpoints;
688 int retval = 0;
689 int vfd_ep_found;
690 int ir_ep_found;
691 int alloc_status;
692 struct sasem_context *context = NULL;
693 int i;
694
695 dev_info(&interface->dev, "%s: found Sasem device\n", __func__);
696
697
698 dev = usb_get_dev(interface_to_usbdev(interface));
699 iface_desc = interface->cur_altsetting;
700 num_endpoints = iface_desc->desc.bNumEndpoints;
701
702 /*
703 * Scan the endpoint list and set:
704 * first input endpoint = IR endpoint
705 * first output endpoint = VFD endpoint
706 */
707
708 ir_ep_found = 0;
709 vfd_ep_found = 0;
710
711 for (i = 0; i < num_endpoints && !(ir_ep_found && vfd_ep_found); ++i) {
712
713 struct usb_endpoint_descriptor *ep;
714 int ep_dir;
715 int ep_type;
716 ep = &iface_desc->endpoint [i].desc;
717 ep_dir = ep->bEndpointAddress & USB_ENDPOINT_DIR_MASK;
718 ep_type = ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
719
720 if (!ir_ep_found &&
721 ep_dir == USB_DIR_IN &&
722 ep_type == USB_ENDPOINT_XFER_INT) {
723
724 rx_endpoint = ep;
725 ir_ep_found = 1;
726 if (debug)
727 dev_info(&interface->dev,
728 "%s: found IR endpoint\n", __func__);
729
730 } else if (!vfd_ep_found &&
731 ep_dir == USB_DIR_OUT &&
732 ep_type == USB_ENDPOINT_XFER_INT) {
733
734 tx_endpoint = ep;
735 vfd_ep_found = 1;
736 if (debug)
737 dev_info(&interface->dev,
738 "%s: found VFD endpoint\n", __func__);
739 }
740 }
741
742 /* Input endpoint is mandatory */
743 if (!ir_ep_found) {
744 dev_err(&interface->dev,
745 "%s: no valid input (IR) endpoint found.\n", __func__);
746 retval = -ENODEV;
747 goto exit;
748 }
749
750 if (!vfd_ep_found)
751 dev_info(&interface->dev,
752 "%s: no valid output (VFD) endpoint found.\n",
753 __func__);
754
755
756 /* Allocate memory */
757 alloc_status = 0;
758
759 context = kzalloc(sizeof(struct sasem_context), GFP_KERNEL);
760 if (!context) {
761 alloc_status = 1;
762 goto alloc_status_switch;
763 }
764 driver = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL);
765 if (!driver) {
766 alloc_status = 2;
767 goto alloc_status_switch;
768 }
769 rbuf = kmalloc(sizeof(struct lirc_buffer), GFP_KERNEL);
770 if (!rbuf) {
771 alloc_status = 3;
772 goto alloc_status_switch;
773 }
774 if (lirc_buffer_init(rbuf, BUF_CHUNK_SIZE, BUF_SIZE)) {
775 dev_err(&interface->dev,
776 "%s: lirc_buffer_init failed\n", __func__);
777 alloc_status = 4;
778 goto alloc_status_switch;
779 }
780 rx_urb = usb_alloc_urb(0, GFP_KERNEL);
781 if (!rx_urb) {
782 dev_err(&interface->dev,
783 "%s: usb_alloc_urb failed for IR urb\n", __func__);
784 alloc_status = 5;
785 goto alloc_status_switch;
786 }
787 if (vfd_ep_found) {
788 tx_urb = usb_alloc_urb(0, GFP_KERNEL);
789 if (!tx_urb) {
790 dev_err(&interface->dev,
791 "%s: usb_alloc_urb failed for VFD urb",
792 __func__);
793 alloc_status = 6;
794 goto alloc_status_switch;
795 }
796 }
797
798 mutex_init(&context->ctx_lock);
799
800 strcpy(driver->name, MOD_NAME);
801 driver->minor = -1;
802 driver->code_length = 64;
803 driver->sample_rate = 0;
804 driver->features = LIRC_CAN_REC_LIRCCODE;
805 driver->data = context;
806 driver->rbuf = rbuf;
807 driver->set_use_inc = ir_open;
808 driver->set_use_dec = ir_close;
809 driver->dev = &interface->dev;
810 driver->owner = THIS_MODULE;
811
812 mutex_lock(&context->ctx_lock);
813
814 lirc_minor = lirc_register_driver(driver);
815 if (lirc_minor < 0) {
816 dev_err(&interface->dev,
817 "%s: lirc_register_driver failed\n", __func__);
818 alloc_status = 7;
819 retval = lirc_minor;
820 goto unlock;
821 } else
822 dev_info(&interface->dev,
823 "%s: Registered Sasem driver (minor:%d)\n",
824 __func__, lirc_minor);
825
826 /* Needed while unregistering! */
827 driver->minor = lirc_minor;
828
829 context->dev = dev;
830 context->dev_present = 1;
831 context->rx_endpoint = rx_endpoint;
832 context->rx_urb = rx_urb;
833 if (vfd_ep_found) {
834 context->tx_endpoint = tx_endpoint;
835 context->tx_urb = tx_urb;
836 context->vfd_contrast = 1000; /* range 0 - 1000 */
837 }
838 context->driver = driver;
839
840 usb_set_intfdata(interface, context);
841
842 if (vfd_ep_found) {
843
844 if (debug)
845 dev_info(&interface->dev,
846 "Registering VFD with sysfs\n");
847 if (usb_register_dev(interface, &sasem_class))
848 /* Not a fatal error, so ignore */
849 dev_info(&interface->dev,
850 "%s: could not get a minor number for VFD\n",
851 __func__);
852 }
853
854 dev_info(&interface->dev,
855 "%s: Sasem device on usb<%d:%d> initialized\n",
856 __func__, dev->bus->busnum, dev->devnum);
857 unlock:
858 mutex_unlock(&context->ctx_lock);
859
860 alloc_status_switch:
861 switch (alloc_status) {
862
863 case 7:
864 if (vfd_ep_found)
865 usb_free_urb(tx_urb);
866 case 6:
867 usb_free_urb(rx_urb);
868 case 5:
869 lirc_buffer_free(rbuf);
870 case 4:
871 kfree(rbuf);
872 case 3:
873 kfree(driver);
874 case 2:
875 kfree(context);
876 context = NULL;
877 case 1:
878 if (retval == 0)
879 retval = -ENOMEM;
880 }
881
882 exit:
883 return retval;
884 }
885
886 /**
887 * Callback function for USB core API: disconnect
888 */
889 static void sasem_disconnect(struct usb_interface *interface)
890 {
891 struct sasem_context *context;
892
893 /* prevent races with ir_open()/vfd_open() */
894 mutex_lock(&disconnect_lock);
895
896 context = usb_get_intfdata(interface);
897 mutex_lock(&context->ctx_lock);
898
899 dev_info(&interface->dev, "%s: Sasem device disconnected\n",
900 __func__);
901
902 usb_set_intfdata(interface, NULL);
903 context->dev_present = 0;
904
905 /* Stop reception */
906 usb_kill_urb(context->rx_urb);
907
908 /* Abort ongoing write */
909 if (atomic_read(&context->tx.busy)) {
910
911 usb_kill_urb(context->tx_urb);
912 wait_for_completion(&context->tx.finished);
913 }
914
915 /* De-register from lirc_dev if IR port is not open */
916 if (!context->ir_isopen)
917 deregister_from_lirc(context);
918
919 usb_deregister_dev(interface, &sasem_class);
920
921 mutex_unlock(&context->ctx_lock);
922
923 if (!context->ir_isopen && !context->vfd_isopen)
924 delete_context(context);
925
926 mutex_unlock(&disconnect_lock);
927 }
928
929 module_usb_driver(sasem_driver);
Linux kernel - Deliverables
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