lincan/src/ioctl_query.c

   1 /* ioctl_query.c
   2  * Linux CAN-bus device driver.
   3  * Written by Arnaud Westenberg email:arnaud@wanadoo.nl
   4  * Rewritten for new CAN queues by Pavel Pisa - OCERA team member
   5  * email:pisa@cmp.felk.cvut.cz
   6  * This software is released under the GPL-License.
   7  * Version lincan-0.2  9 Jul 2003
   8  */
   9
  10 #include "../include/can.h"
  11 #include "../include/can_sysdep.h"
  12 #include "../include/main.h"
  13 #include "../include/ioctl.h"
  14
  15
  16 /**
  17  * can_ioctl_query - query for driver version and features
  18  * @canuser: pointer to the user/client state structure
  19  * @what:    select which feature or version is queried
  20  *
  21  * Return Value: returns value for queried characteristic or -EINVAL
  22  *      if there is no reply to the query.
  23  */
  24
  25 int can_ioctl_query(struct canuser_t *canuser, unsigned long what)
  26 {
  27         switch(what){
  28                 case CAN_DRV_QRY_BRANCH:
  29                         /* returns driver branch value - "LINC" for LinCAN driver */
  30                         return CAN_DRV_BRANCH;
  31
  32                 case CAN_DRV_QRY_VERSION:
  33                         /* returns driver version as (major<<16) | (minor<<8) | patch */
  34                         return CAN_DRV_VER;
  35
  36                 case CAN_DRV_QRY_MSGFORMAT:
  37                         /* format of canmsg_t structure */
  38                         #ifdef CAN_MSG_VERSION_2
  39                           return 2;
  40                         #else /*CAN_MSG_VERSION_2*/
  41                           return 1;
  42                         #endif /*CAN_MSG_VERSION_2*/
  43         }
  44
  45         return -EINVAL;
  46 }