lincan/src/ioctl.c

   1 /* ioctl.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 <linux/autoconf.h>
  11
  12 #include <linux/fs.h>
  13 #include <linux/version.h>
  14 #include <linux/string.h>
  15 #include <asm/uaccess.h>
  16
  17 #include "../include/main.h"
  18 #include "../include/ioctl.h"
  19 #include "../include/i82527.h"
  20
  21 int can_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
  22 {
  23         int i=0;
  24         unsigned short channel=0;
  25         unsigned btr0=0, btr1=0;
  26         struct canuser_t *canuser = (struct canuser_t*)(file->private_data);
  27         struct msgobj_t *obj;
  28         struct chip_t *chip;
  29         struct canque_ends_t *qends;
  30
  31         if(!canuser || (canuser->magic != CAN_USER_MAGIC)){
  32                 CANMSG("can_close: bad canuser magic\n");
  33                 return -ENODEV;
  34         }
  35
  36         obj = canuser->msgobj;
  37         if (obj == NULL) {
  38                 CANMSG("Could not assign buffer structure\n");
  39                 return -1;
  40         }
  41
  42         qends = canuser->qends;
  43         chip = obj->hostchip;
  44         if (chip == NULL) {
  45                 CANMSG("Device is not correctly configured.\n");
  46                 CANMSG("Please reload the driver.\n");
  47                 return -1;
  48         }
  49
  50         switch (cmd) {
  51                 case STAT: {
  52                         for (i=0x0; i<0x100; i++)
  53                                 CANMSG("0x%x is 0x%x\n",i,can_read_reg(chip,i));
  54                         break;
  55                 }
  56                 case CMD_START: {
  57                         if (chip->chipspecops->start_chip(chip))
  58                                 return -1;
  59                         break;
  60                 }
  61                 case CMD_STOP: {
  62                         if (chip->chipspecops->stop_chip(chip))
  63                                 return -1;
  64                         break;
  65                 }
  66                 case CONF_FILTER: {
  67                     #if 0
  68                         if (!strcmp(chip->chip_type,"i82527")) {
  69
  70                                 unsigned char id1, id0;
  71                                 id1 = (unsigned char) (arg << 5);
  72                                 id0 = (unsigned char) (arg >> 3);
  73
  74                                 DEBUGMSG("configuring ID=%lx in message object:"
  75                                         " %02x, %02x\n", arg, id0, id1);
  76                                 can_write_reg(chip,id1,MSG_OFFSET(obj->object) +
  77                                                                 iMSGID1);
  78                                 can_write_reg(chip,id0,MSG_OFFSET(obj->object) +
  79                                                                 iMSGID0);
  80                         }
  81                     #endif
  82
  83                         /* In- and output buffer re-initialization */
  84
  85                         if(canuser->rx_edge0){
  86                                 canque_set_filt(canuser->rx_edge0, arg, ~0);
  87                                 canque_flush(canuser->rx_edge0);
  88                         }
  89
  90                         break;
  91                 }
  92
  93                 case CONF_FILTER_QUE0: {
  94                         struct canfilt_t canfilt;
  95                         copy_from_user(&canfilt, (void*)arg, sizeof(struct canfilt_t));
  96                         if(canuser->rx_edge0){
  97                                 canque_set_filt(canuser->rx_edge0, canfilt.id, canfilt.mask);
  98                                 canque_flush(canuser->rx_edge0);
  99                         }
 100                         break;
 101                 }
 102
 103                 case CONF_BAUD: {
 104                         channel = arg & 0xff;
 105                         btr0 = (arg >> 8) & 0xff;
 106                         btr1 = (arg >> 16) & 0xff;
 107
 108                         if (chip->chipspecops->set_btregs(chip, btr0, btr1)) {
 109                                 CANMSG("Error setting bit timing registers\n");
 110                                 return -1;
 111                         }
 112                         break;
 113                 }
 114                 default: {
 115                         CANMSG("Not a valid ioctl command\n");
 116                         return -EINVAL;
 117                 }
 118
 119         }
 120
 121         return 0;
 122 }