]> rtime.felk.cvut.cz Git - lincan.git/blob - lincan/src/ioctl_query.c
The LinCAN driver license unified according to DCE FEE CTU head and superiors request.
[lincan.git] / lincan / src / ioctl_query.c
1 /**************************************************************************/
2 /* File: ioctl_queue.c - CAN driver parameters and versions queries       */
3 /*                                                                        */
4 /* LinCAN - (Not only) Linux CAN bus driver                               */
5 /* Copyright (C) 2002-2009 DCE FEE CTU Prague <http://dce.felk.cvut.cz>   */
6 /* Copyright (C) 2002-2009 Pavel Pisa <pisa@cmp.felk.cvut.cz>             */
7 /* Funded by OCERA and FRESCOR IST projects                               */
8 /* Based on CAN driver code by Arnaud Westenberg <arnaud@wanadoo.nl>      */
9 /*                                                                        */
10 /* LinCAN is free software; you can redistribute it and/or modify it      */
11 /* under terms of the GNU General Public License as published by the      */
12 /* Free Software Foundation; either version 2, or (at your option) any    */
13 /* later version.  LinCAN is distributed in the hope that it will be      */
14 /* useful, but WITHOUT ANY WARRANTY; without even the implied warranty    */
15 /* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU    */
16 /* General Public License for more details. You should have received a    */
17 /* copy of the GNU General Public License along with LinCAN; see file     */
18 /* COPYING. If not, write to the Free Software Foundation, 675 Mass Ave,  */
19 /* Cambridge, MA 02139, USA.                                              */
20 /*                                                                        */
21 /* To allow use of LinCAN in the compact embedded systems firmware        */
22 /* and RT-executives (RTEMS for example), main authors agree with next    */
23 /* special exception:                                                     */
24 /*                                                                        */
25 /* Including LinCAN header files in a file, instantiating LinCAN generics */
26 /* or templates, or linking other files with LinCAN objects to produce    */
27 /* an application image/executable, does not by itself cause the          */
28 /* resulting application image/executable to be covered by                */
29 /* the GNU General Public License.                                        */
30 /* This exception does not however invalidate any other reasons           */
31 /* why the executable file might be covered by the GNU Public License.    */
32 /* Publication of enhanced or derived LinCAN files is required although.  */
33 /**************************************************************************/
34
35 #include "../include/can.h"
36 #include "../include/can_sysdep.h"
37 #include "../include/main.h"
38 #include "../include/ioctl.h"
39
40
41 /**
42  * can_ioctl_query - query for driver version and features
43  * @canuser: pointer to the user/client state structure
44  * @what:    select which feature or version is queried
45  *
46  * Return Value: returns value for queried characteristic or -EINVAL
47  *      if there is no reply to the query.
48  */
49
50 int can_ioctl_query(struct canuser_t *canuser, unsigned long what)
51 {
52         switch(what){
53                 case CAN_DRV_QRY_BRANCH:
54                         /* returns driver branch value - "LINC" for LinCAN driver */
55                         return CAN_DRV_BRANCH;
56
57                 case CAN_DRV_QRY_VERSION:
58                         /* returns driver version as (major<<16) | (minor<<8) | patch */
59                         return CAN_DRV_VER;
60
61                 case CAN_DRV_QRY_MSGFORMAT:
62                         /* format of canmsg_t structure */
63                         #ifdef CAN_MSG_VERSION_2
64                           return 2;
65                         #else /*CAN_MSG_VERSION_2*/
66                           return 1;
67                         #endif /*CAN_MSG_VERSION_2*/
68         }
69
70         return -EINVAL;
71 }