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selinux: fix overflow and 0 length allocations
[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 #include <linux/ktime.h>
46
47 #include <media/lirc.h>
48 #include <media/lirc_dev.h>
49
50
51 #define MOD_AUTHOR "Oliver Stabel <oliver.stabel@gmx.de>, " \
52 "Tim Davies <tim@opensystems.net.au>"
53 #define MOD_DESC "USB Driver for Sasem Remote Controller V1.1"
54 #define MOD_NAME "lirc_sasem"
55 #define MOD_VERSION "0.5"
56
57 #define VFD_MINOR_BASE 144 /* Same as LCD */
58 #define DEVICE_NAME "lcd%d"
59
60 #define BUF_CHUNK_SIZE 8
61 #define BUF_SIZE 128
62
63 #define IOCTL_LCD_CONTRAST 1
64
65 /*** P R O T O T Y P E S ***/
66
67 /* USB Callback prototypes */
68 static int sasem_probe(struct usb_interface *interface,
69 const struct usb_device_id *id);
70 static void sasem_disconnect(struct usb_interface *interface);
71 static void usb_rx_callback(struct urb *urb);
72 static void usb_tx_callback(struct urb *urb);
73
74 /* VFD file_operations function prototypes */
75 static int vfd_open(struct inode *inode, struct file *file);
76 static long vfd_ioctl(struct file *file, unsigned cmd, unsigned long arg);
77 static int vfd_close(struct inode *inode, struct file *file);
78 static ssize_t vfd_write(struct file *file, const char __user *buf,
79 size_t n_bytes, loff_t *pos);
80
81 /* LIRC driver function prototypes */
82 static int ir_open(void *data);
83 static void ir_close(void *data);
84
85 /*** G L O B A L S ***/
86 #define SASEM_DATA_BUF_SZ 32
87
88 struct sasem_context {
89
90 struct usb_device *dev;
91 int vfd_isopen; /* VFD port has been opened */
92 unsigned int vfd_contrast; /* VFD contrast */
93 int ir_isopen; /* IR port has been opened */
94 int dev_present; /* USB device presence */
95 struct mutex ctx_lock; /* to lock this object */
96 wait_queue_head_t remove_ok; /* For unexpected USB disconnects */
97
98 struct lirc_driver *driver;
99 struct usb_endpoint_descriptor *rx_endpoint;
100 struct usb_endpoint_descriptor *tx_endpoint;
101 struct urb *rx_urb;
102 struct urb *tx_urb;
103 unsigned char usb_rx_buf[8];
104 unsigned char usb_tx_buf[8];
105
106 struct tx_t {
107 unsigned char data_buf[SASEM_DATA_BUF_SZ]; /* user data
108 * buffer */
109 struct completion finished; /* wait for write to finish */
110 atomic_t busy; /* write in progress */
111 int status; /* status of tx completion */
112 } tx;
113
114 /* for dealing with repeat codes (wish there was a toggle bit!) */
115 ktime_t presstime;
116 char lastcode[8];
117 int codesaved;
118 };
119
120 /* VFD file operations */
121 static const struct file_operations vfd_fops = {
122 .owner = THIS_MODULE,
123 .open = &vfd_open,
124 .write = vfd_write,
125 .unlocked_ioctl = &vfd_ioctl,
126 .release = &vfd_close,
127 .llseek = noop_llseek,
128 };
129
130 /* USB Device ID for Sasem USB Control Board */
131 static struct usb_device_id sasem_usb_id_table[] = {
132 /* Sasem USB Control Board */
133 { USB_DEVICE(0x11ba, 0x0101) },
134 /* Terminating entry */
135 {}
136 };
137
138 /* USB Device data */
139 static struct usb_driver sasem_driver = {
140 .name = MOD_NAME,
141 .probe = sasem_probe,
142 .disconnect = sasem_disconnect,
143 .id_table = sasem_usb_id_table,
144 };
145
146 static struct usb_class_driver sasem_class = {
147 .name = DEVICE_NAME,
148 .fops = &vfd_fops,
149 .minor_base = VFD_MINOR_BASE,
150 };
151
152 /* to prevent races between open() and disconnect() */
153 static DEFINE_MUTEX(disconnect_lock);
154
155 static int debug;
156
157
158 /*** M O D U L E C O D E ***/
159
160 MODULE_AUTHOR(MOD_AUTHOR);
161 MODULE_DESCRIPTION(MOD_DESC);
162 MODULE_LICENSE("GPL");
163 module_param(debug, int, S_IRUGO | S_IWUSR);
164 MODULE_PARM_DESC(debug, "Debug messages: 0=no, 1=yes (default: no)");
165
166 static void delete_context(struct sasem_context *context)
167 {
168 usb_free_urb(context->tx_urb); /* VFD */
169 usb_free_urb(context->rx_urb); /* IR */
170 lirc_buffer_free(context->driver->rbuf);
171 kfree(context->driver->rbuf);
172 kfree(context->driver);
173 kfree(context);
174 }
175
176 static void deregister_from_lirc(struct sasem_context *context)
177 {
178 int retval;
179 int minor = context->driver->minor;
180
181 retval = lirc_unregister_driver(minor);
182 if (retval)
183 dev_err(&context->dev->dev,
184 "%s: unable to deregister from lirc (%d)\n",
185 __func__, retval);
186 else
187 dev_info(&context->dev->dev,
188 "Deregistered Sasem driver (minor:%d)\n", minor);
189
190 }
191
192 /**
193 * Called when the VFD device (e.g. /dev/usb/lcd)
194 * is opened by the application.
195 */
196 static int vfd_open(struct inode *inode, struct file *file)
197 {
198 struct usb_interface *interface;
199 struct sasem_context *context = NULL;
200 int subminor;
201 int retval = 0;
202
203 /* prevent races with disconnect */
204 mutex_lock(&disconnect_lock);
205
206 subminor = iminor(inode);
207 interface = usb_find_interface(&sasem_driver, subminor);
208 if (!interface) {
209 pr_err("%s: could not find interface for minor %d\n",
210 __func__, subminor);
211 retval = -ENODEV;
212 goto exit;
213 }
214 context = usb_get_intfdata(interface);
215
216 if (!context) {
217 dev_err(&interface->dev, "no context found for minor %d\n",
218 subminor);
219 retval = -ENODEV;
220 goto exit;
221 }
222
223 mutex_lock(&context->ctx_lock);
224
225 if (context->vfd_isopen) {
226 dev_err(&interface->dev,
227 "%s: VFD port is already open", __func__);
228 retval = -EBUSY;
229 } else {
230 context->vfd_isopen = 1;
231 file->private_data = context;
232 dev_info(&interface->dev, "VFD port opened\n");
233 }
234
235 mutex_unlock(&context->ctx_lock);
236
237 exit:
238 mutex_unlock(&disconnect_lock);
239 return retval;
240 }
241
242 /**
243 * Called when the VFD device (e.g. /dev/usb/lcd)
244 * is closed by the application.
245 */
246 static long vfd_ioctl(struct file *file, unsigned cmd, unsigned long arg)
247 {
248 struct sasem_context *context;
249
250 context = (struct sasem_context *) file->private_data;
251
252 if (!context) {
253 pr_err("%s: no context for device\n", __func__);
254 return -ENODEV;
255 }
256
257 mutex_lock(&context->ctx_lock);
258
259 switch (cmd) {
260 case IOCTL_LCD_CONTRAST:
261 if (arg > 1000)
262 arg = 1000;
263 context->vfd_contrast = (unsigned int)arg;
264 break;
265 default:
266 pr_info("Unknown IOCTL command\n");
267 mutex_unlock(&context->ctx_lock);
268 return -ENOIOCTLCMD; /* not supported */
269 }
270
271 mutex_unlock(&context->ctx_lock);
272 return 0;
273 }
274
275 /**
276 * Called when the VFD device (e.g. /dev/usb/lcd)
277 * is closed by the application.
278 */
279 static int vfd_close(struct inode *inode, struct file *file)
280 {
281 struct sasem_context *context = NULL;
282 int retval = 0;
283
284 context = (struct sasem_context *) file->private_data;
285
286 if (!context) {
287 pr_err("%s: no context for device\n", __func__);
288 return -ENODEV;
289 }
290
291 mutex_lock(&context->ctx_lock);
292
293 if (!context->vfd_isopen) {
294 dev_err(&context->dev->dev, "%s: VFD is not open\n", __func__);
295 retval = -EIO;
296 } else {
297 context->vfd_isopen = 0;
298 dev_info(&context->dev->dev, "VFD port closed\n");
299 if (!context->dev_present && !context->ir_isopen) {
300
301 /* Device disconnected before close and IR port is
302 * not open. If IR port is open, context will be
303 * deleted by ir_close. */
304 mutex_unlock(&context->ctx_lock);
305 delete_context(context);
306 return retval;
307 }
308 }
309
310 mutex_unlock(&context->ctx_lock);
311 return retval;
312 }
313
314 /**
315 * Sends a packet to the VFD.
316 */
317 static int send_packet(struct sasem_context *context)
318 {
319 unsigned int pipe;
320 int interval = 0;
321 int retval = 0;
322
323 pipe = usb_sndintpipe(context->dev,
324 context->tx_endpoint->bEndpointAddress);
325 interval = context->tx_endpoint->bInterval;
326
327 usb_fill_int_urb(context->tx_urb, context->dev, pipe,
328 context->usb_tx_buf, sizeof(context->usb_tx_buf),
329 usb_tx_callback, context, interval);
330
331 context->tx_urb->actual_length = 0;
332
333 init_completion(&context->tx.finished);
334 atomic_set(&context->tx.busy, 1);
335
336 retval = usb_submit_urb(context->tx_urb, GFP_KERNEL);
337 if (retval) {
338 atomic_set(&context->tx.busy, 0);
339 dev_err(&context->dev->dev, "error submitting urb (%d)\n",
340 retval);
341 } else {
342 /* Wait for transmission to complete (or abort) */
343 mutex_unlock(&context->ctx_lock);
344 wait_for_completion(&context->tx.finished);
345 mutex_lock(&context->ctx_lock);
346
347 retval = context->tx.status;
348 if (retval)
349 dev_err(&context->dev->dev,
350 "packet tx failed (%d)\n", retval);
351 }
352
353 return retval;
354 }
355
356 /**
357 * Writes data to the VFD. The Sasem VFD is 2x16 characters
358 * and requires data in 9 consecutive USB interrupt packets,
359 * each packet carrying 8 bytes.
360 */
361 static ssize_t vfd_write(struct file *file, const char __user *buf,
362 size_t n_bytes, loff_t *pos)
363 {
364 int i;
365 int retval = 0;
366 struct sasem_context *context;
367 int *data_buf = NULL;
368
369 context = (struct sasem_context *) file->private_data;
370 if (!context) {
371 pr_err("%s: no context for device\n", __func__);
372 return -ENODEV;
373 }
374
375 mutex_lock(&context->ctx_lock);
376
377 if (!context->dev_present) {
378 pr_err("%s: no Sasem device present\n", __func__);
379 retval = -ENODEV;
380 goto exit;
381 }
382
383 if (n_bytes <= 0 || n_bytes > SASEM_DATA_BUF_SZ) {
384 dev_err(&context->dev->dev, "%s: invalid payload size\n",
385 __func__);
386 retval = -EINVAL;
387 goto exit;
388 }
389
390 data_buf = memdup_user(buf, n_bytes);
391 if (IS_ERR(data_buf)) {
392 retval = PTR_ERR(data_buf);
393 data_buf = NULL;
394 goto exit;
395 }
396
397 memcpy(context->tx.data_buf, data_buf, n_bytes);
398
399 /* Pad with spaces */
400 for (i = n_bytes; i < SASEM_DATA_BUF_SZ; ++i)
401 context->tx.data_buf[i] = ' ';
402
403 /* Nine 8 byte packets to be sent */
404 /* NOTE: "\x07\x01\0\0\0\0\0\0" or "\x0c\0\0\0\0\0\0\0"
405 * will clear the VFD */
406 for (i = 0; i < 9; i++) {
407 switch (i) {
408 case 0:
409 memcpy(context->usb_tx_buf, "\x07\0\0\0\0\0\0\0", 8);
410 context->usb_tx_buf[1] = (context->vfd_contrast) ?
411 (0x2B - (context->vfd_contrast - 1) / 250)
412 : 0x2B;
413 break;
414 case 1:
415 memcpy(context->usb_tx_buf, "\x09\x01\0\0\0\0\0\0", 8);
416 break;
417 case 2:
418 memcpy(context->usb_tx_buf, "\x0b\x01\0\0\0\0\0\0", 8);
419 break;
420 case 3:
421 memcpy(context->usb_tx_buf, context->tx.data_buf, 8);
422 break;
423 case 4:
424 memcpy(context->usb_tx_buf,
425 context->tx.data_buf + 8, 8);
426 break;
427 case 5:
428 memcpy(context->usb_tx_buf, "\x09\x01\0\0\0\0\0\0", 8);
429 break;
430 case 6:
431 memcpy(context->usb_tx_buf, "\x0b\x02\0\0\0\0\0\0", 8);
432 break;
433 case 7:
434 memcpy(context->usb_tx_buf,
435 context->tx.data_buf + 16, 8);
436 break;
437 case 8:
438 memcpy(context->usb_tx_buf,
439 context->tx.data_buf + 24, 8);
440 break;
441 }
442 retval = send_packet(context);
443 if (retval) {
444 dev_err(&context->dev->dev,
445 "send packet failed for packet #%d\n", i);
446 goto exit;
447 }
448 }
449 exit:
450
451 mutex_unlock(&context->ctx_lock);
452 kfree(data_buf);
453
454 return (!retval) ? n_bytes : retval;
455 }
456
457 /**
458 * Callback function for USB core API: transmit data
459 */
460 static void usb_tx_callback(struct urb *urb)
461 {
462 struct sasem_context *context;
463
464 if (!urb)
465 return;
466 context = (struct sasem_context *) urb->context;
467 if (!context)
468 return;
469
470 context->tx.status = urb->status;
471
472 /* notify waiters that write has finished */
473 atomic_set(&context->tx.busy, 0);
474 complete(&context->tx.finished);
475 }
476
477 /**
478 * Called by lirc_dev when the application opens /dev/lirc
479 */
480 static int ir_open(void *data)
481 {
482 int retval = 0;
483 struct sasem_context *context;
484
485 /* prevent races with disconnect */
486 mutex_lock(&disconnect_lock);
487
488 context = data;
489
490 mutex_lock(&context->ctx_lock);
491
492 if (context->ir_isopen) {
493 dev_err(&context->dev->dev, "%s: IR port is already open\n",
494 __func__);
495 retval = -EBUSY;
496 goto exit;
497 }
498
499 usb_fill_int_urb(context->rx_urb, context->dev,
500 usb_rcvintpipe(context->dev,
501 context->rx_endpoint->bEndpointAddress),
502 context->usb_rx_buf, sizeof(context->usb_rx_buf),
503 usb_rx_callback, context, context->rx_endpoint->bInterval);
504
505 retval = usb_submit_urb(context->rx_urb, GFP_KERNEL);
506
507 if (retval)
508 dev_err(&context->dev->dev,
509 "usb_submit_urb failed for ir_open (%d)\n", retval);
510 else {
511 context->ir_isopen = 1;
512 dev_info(&context->dev->dev, "IR port opened\n");
513 }
514
515 exit:
516 mutex_unlock(&context->ctx_lock);
517
518 mutex_unlock(&disconnect_lock);
519 return retval;
520 }
521
522 /**
523 * Called by lirc_dev when the application closes /dev/lirc
524 */
525 static void ir_close(void *data)
526 {
527 struct sasem_context *context;
528
529 context = data;
530 if (!context) {
531 pr_err("%s: no context for device\n", __func__);
532 return;
533 }
534
535 mutex_lock(&context->ctx_lock);
536
537 usb_kill_urb(context->rx_urb);
538 context->ir_isopen = 0;
539 pr_info("IR port closed\n");
540
541 if (!context->dev_present) {
542
543 /*
544 * Device disconnected while IR port was
545 * still open. Driver was not deregistered
546 * at disconnect time, so do it now.
547 */
548 deregister_from_lirc(context);
549
550 if (!context->vfd_isopen) {
551
552 mutex_unlock(&context->ctx_lock);
553 delete_context(context);
554 return;
555 }
556 /* If VFD port is open, context will be deleted by vfd_close */
557 }
558
559 mutex_unlock(&context->ctx_lock);
560 }
561
562 /**
563 * Process the incoming packet
564 */
565 static void incoming_packet(struct sasem_context *context,
566 struct urb *urb)
567 {
568 int len = urb->actual_length;
569 unsigned char *buf = urb->transfer_buffer;
570 u64 ns;
571 ktime_t kt;
572
573 if (len != 8) {
574 dev_warn(&context->dev->dev,
575 "%s: invalid incoming packet size (%d)\n",
576 __func__, len);
577 return;
578 }
579
580 if (debug)
581 dev_info(&context->dev->dev, "Incoming data: %*ph\n", len, buf);
582 /*
583 * Lirc could deal with the repeat code, but we really need to block it
584 * if it arrives too late. Otherwise we could repeat the wrong code.
585 */
586
587 /* get the time since the last button press */
588 kt = ktime_get();
589 ns = ktime_to_ns(ktime_sub(kt, context->presstime));
590
591 if (memcmp(buf, "\x08\0\0\0\0\0\0\0", 8) == 0) {
592 /*
593 * the repeat code is being sent, so we copy
594 * the old code to LIRC
595 */
596
597 /*
598 * NOTE: Only if the last code was less than 250ms ago
599 * - no one should be able to push another (undetected) button
600 * in that time and then get a false repeat of the previous
601 * press but it is long enough for a genuine repeat
602 */
603 if ((ns < 250 * NSEC_PER_MSEC) && (context->codesaved != 0)) {
604 memcpy(buf, &context->lastcode, 8);
605 context->presstime = kt;
606 }
607 } else {
608 /* save the current valid code for repeats */
609 memcpy(&context->lastcode, buf, 8);
610 /*
611 * set flag to signal a valid code was save;
612 * just for safety reasons
613 */
614 context->codesaved = 1;
615 context->presstime = kt;
616 }
617
618 lirc_buffer_write(context->driver->rbuf, buf);
619 wake_up(&context->driver->rbuf->wait_poll);
620 }
621
622 /**
623 * Callback function for USB core API: receive data
624 */
625 static void usb_rx_callback(struct urb *urb)
626 {
627 struct sasem_context *context;
628
629 if (!urb)
630 return;
631 context = (struct sasem_context *) urb->context;
632 if (!context)
633 return;
634
635 switch (urb->status) {
636
637 case -ENOENT: /* usbcore unlink successful! */
638 return;
639
640 case 0:
641 if (context->ir_isopen)
642 incoming_packet(context, urb);
643 break;
644
645 default:
646 dev_warn(&urb->dev->dev, "%s: status (%d): ignored",
647 __func__, urb->status);
648 break;
649 }
650
651 usb_submit_urb(context->rx_urb, GFP_ATOMIC);
652 }
653
654
655
656 /**
657 * Callback function for USB core API: Probe
658 */
659 static int sasem_probe(struct usb_interface *interface,
660 const struct usb_device_id *id)
661 {
662 struct usb_device *dev = NULL;
663 struct usb_host_interface *iface_desc = NULL;
664 struct usb_endpoint_descriptor *rx_endpoint = NULL;
665 struct usb_endpoint_descriptor *tx_endpoint = NULL;
666 struct urb *rx_urb = NULL;
667 struct urb *tx_urb = NULL;
668 struct lirc_driver *driver = NULL;
669 struct lirc_buffer *rbuf = NULL;
670 int lirc_minor = 0;
671 int num_endpoints;
672 int retval = 0;
673 int vfd_ep_found;
674 int ir_ep_found;
675 int alloc_status;
676 struct sasem_context *context = NULL;
677 int i;
678
679 dev_info(&interface->dev, "%s: found Sasem device\n", __func__);
680
681
682 dev = usb_get_dev(interface_to_usbdev(interface));
683 iface_desc = interface->cur_altsetting;
684 num_endpoints = iface_desc->desc.bNumEndpoints;
685
686 /*
687 * Scan the endpoint list and set:
688 * first input endpoint = IR endpoint
689 * first output endpoint = VFD endpoint
690 */
691
692 ir_ep_found = 0;
693 vfd_ep_found = 0;
694
695 for (i = 0; i < num_endpoints && !(ir_ep_found && vfd_ep_found); ++i) {
696
697 struct usb_endpoint_descriptor *ep;
698
699 ep = &iface_desc->endpoint [i].desc;
700
701 if (!ir_ep_found &&
702 usb_endpoint_is_int_in(ep)) {
703
704 rx_endpoint = ep;
705 ir_ep_found = 1;
706 if (debug)
707 dev_info(&interface->dev,
708 "%s: found IR endpoint\n", __func__);
709
710 } else if (!vfd_ep_found &&
711 usb_endpoint_is_int_out(ep)) {
712
713 tx_endpoint = ep;
714 vfd_ep_found = 1;
715 if (debug)
716 dev_info(&interface->dev,
717 "%s: found VFD endpoint\n", __func__);
718 }
719 }
720
721 /* Input endpoint is mandatory */
722 if (!ir_ep_found) {
723 dev_err(&interface->dev,
724 "%s: no valid input (IR) endpoint found.\n", __func__);
725 retval = -ENODEV;
726 goto exit;
727 }
728
729 if (!vfd_ep_found)
730 dev_info(&interface->dev,
731 "%s: no valid output (VFD) endpoint found.\n",
732 __func__);
733
734
735 /* Allocate memory */
736 alloc_status = 0;
737
738 context = kzalloc(sizeof(struct sasem_context), GFP_KERNEL);
739 if (!context) {
740 alloc_status = 1;
741 goto alloc_status_switch;
742 }
743 driver = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL);
744 if (!driver) {
745 alloc_status = 2;
746 goto alloc_status_switch;
747 }
748 rbuf = kmalloc(sizeof(struct lirc_buffer), GFP_KERNEL);
749 if (!rbuf) {
750 alloc_status = 3;
751 goto alloc_status_switch;
752 }
753 if (lirc_buffer_init(rbuf, BUF_CHUNK_SIZE, BUF_SIZE)) {
754 dev_err(&interface->dev,
755 "%s: lirc_buffer_init failed\n", __func__);
756 alloc_status = 4;
757 goto alloc_status_switch;
758 }
759 rx_urb = usb_alloc_urb(0, GFP_KERNEL);
760 if (!rx_urb) {
761 dev_err(&interface->dev,
762 "%s: usb_alloc_urb failed for IR urb\n", __func__);
763 alloc_status = 5;
764 goto alloc_status_switch;
765 }
766 if (vfd_ep_found) {
767 tx_urb = usb_alloc_urb(0, GFP_KERNEL);
768 if (!tx_urb) {
769 dev_err(&interface->dev,
770 "%s: usb_alloc_urb failed for VFD urb",
771 __func__);
772 alloc_status = 6;
773 goto alloc_status_switch;
774 }
775 }
776
777 mutex_init(&context->ctx_lock);
778
779 strcpy(driver->name, MOD_NAME);
780 driver->minor = -1;
781 driver->code_length = 64;
782 driver->sample_rate = 0;
783 driver->features = LIRC_CAN_REC_LIRCCODE;
784 driver->data = context;
785 driver->rbuf = rbuf;
786 driver->set_use_inc = ir_open;
787 driver->set_use_dec = ir_close;
788 driver->dev = &interface->dev;
789 driver->owner = THIS_MODULE;
790
791 mutex_lock(&context->ctx_lock);
792
793 lirc_minor = lirc_register_driver(driver);
794 if (lirc_minor < 0) {
795 dev_err(&interface->dev,
796 "%s: lirc_register_driver failed\n", __func__);
797 alloc_status = 7;
798 retval = lirc_minor;
799 goto unlock;
800 } else
801 dev_info(&interface->dev,
802 "%s: Registered Sasem driver (minor:%d)\n",
803 __func__, lirc_minor);
804
805 /* Needed while unregistering! */
806 driver->minor = lirc_minor;
807
808 context->dev = dev;
809 context->dev_present = 1;
810 context->rx_endpoint = rx_endpoint;
811 context->rx_urb = rx_urb;
812 if (vfd_ep_found) {
813 context->tx_endpoint = tx_endpoint;
814 context->tx_urb = tx_urb;
815 context->vfd_contrast = 1000; /* range 0 - 1000 */
816 }
817 context->driver = driver;
818
819 usb_set_intfdata(interface, context);
820
821 if (vfd_ep_found) {
822
823 if (debug)
824 dev_info(&interface->dev,
825 "Registering VFD with sysfs\n");
826 if (usb_register_dev(interface, &sasem_class))
827 /* Not a fatal error, so ignore */
828 dev_info(&interface->dev,
829 "%s: could not get a minor number for VFD\n",
830 __func__);
831 }
832
833 dev_info(&interface->dev,
834 "%s: Sasem device on usb<%d:%d> initialized\n",
835 __func__, dev->bus->busnum, dev->devnum);
836 unlock:
837 mutex_unlock(&context->ctx_lock);
838
839 alloc_status_switch:
840 switch (alloc_status) {
841
842 case 7:
843 if (vfd_ep_found)
844 usb_free_urb(tx_urb);
845 case 6:
846 usb_free_urb(rx_urb);
847 /* fall-through */
848 case 5:
849 lirc_buffer_free(rbuf);
850 /* fall-through */
851 case 4:
852 kfree(rbuf);
853 /* fall-through */
854 case 3:
855 kfree(driver);
856 /* fall-through */
857 case 2:
858 kfree(context);
859 context = NULL;
860 /* fall-through */
861 case 1:
862 if (retval == 0)
863 retval = -ENOMEM;
864 }
865
866 exit:
867 return retval;
868 }
869
870 /**
871 * Callback function for USB core API: disconnect
872 */
873 static void sasem_disconnect(struct usb_interface *interface)
874 {
875 struct sasem_context *context;
876
877 /* prevent races with ir_open()/vfd_open() */
878 mutex_lock(&disconnect_lock);
879
880 context = usb_get_intfdata(interface);
881 mutex_lock(&context->ctx_lock);
882
883 dev_info(&interface->dev, "%s: Sasem device disconnected\n",
884 __func__);
885
886 usb_set_intfdata(interface, NULL);
887 context->dev_present = 0;
888
889 /* Stop reception */
890 usb_kill_urb(context->rx_urb);
891
892 /* Abort ongoing write */
893 if (atomic_read(&context->tx.busy)) {
894
895 usb_kill_urb(context->tx_urb);
896 wait_for_completion(&context->tx.finished);
897 }
898
899 /* De-register from lirc_dev if IR port is not open */
900 if (!context->ir_isopen)
901 deregister_from_lirc(context);
902
903 usb_deregister_dev(interface, &sasem_class);
904
905 mutex_unlock(&context->ctx_lock);
906
907 if (!context->ir_isopen && !context->vfd_isopen)
908 delete_context(context);
909
910 mutex_unlock(&disconnect_lock);
911 }
912
913 module_usb_driver(sasem_driver);
Linux kernel - Deliverables
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