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-0.3  17 Jun 2004
   8  */
   9
  10 #include "../include/can.h"
  11 #include "../include/can_sysdep.h"
  12 #include "../include/main.h"
  13 #include "../include/ioctl.h"
  14 #include "../include/i82527.h"
  15
  16 int can_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
  17 {
  18         int i=0;
  19         unsigned short channel=0;
  20         unsigned btr0=0, btr1=0;
  21         struct canuser_t *canuser = (struct canuser_t*)(file->private_data);
  22         struct msgobj_t *obj;
  23         struct canchip_t *chip;
  24         struct canque_ends_t *qends;
  25
  26         if(!canuser || (canuser->magic != CAN_USER_MAGIC)){
  27                 CANMSG("can_ioctl: bad canuser magic\n");
  28                 return -ENODEV;
  29         }
  30
  31         obj = canuser->msgobj;
  32         if (obj == NULL) {
  33                 CANMSG("Could not assign buffer structure\n");
  34                 return -1;
  35         }
  36
  37         qends = canuser->qends;
  38         chip = obj->hostchip;
  39         if (chip == NULL) {
  40                 CANMSG("Device is not correctly configured.\n");
  41                 CANMSG("Please reload the driver.\n");
  42                 return -1;
  43         }
  44
  45         switch (cmd) {
  46                 case CAN_DRV_QUERY: {
  47                         return can_ioctl_query(canuser, arg);
  48                 }
  49                 case STAT: {
  50                         for (i=0x0; i<0x100; i++)
  51                                 CANMSG("0x%x is 0x%x\n",i,can_read_reg(chip,i));
  52                         break;
  53                 }
  54                 case CMD_START: {
  55                         if (chip->chipspecops->start_chip(chip))
  56                                 return -1;
  57                         break;
  58                 }
  59                 case CMD_STOP: {
  60                         if (chip->chipspecops->stop_chip(chip))
  61                                 return -1;
  62                         break;
  63                 }
  64                 case CANQUE_FLUSH: {
  65                         canque_flush(canuser->rx_edge0);
  66                         break;
  67                 }
  68                 case CONF_FILTER: {
  69
  70                         /* In- and output buffer re-initialization */
  71
  72                         if(canuser->rx_edge0){
  73                                 canque_set_filt(canuser->rx_edge0, arg, ~0, 0);
  74                         }
  75
  76                         break;
  77                 }
  78
  79                 case CANQUE_FILTER: {
  80                         struct canfilt_t canfilt;
  81                         copy_from_user(&canfilt, (void*)arg, sizeof(struct canfilt_t));
  82                         if(canuser->rx_edge0){
  83                                 canque_set_filt(canuser->rx_edge0, canfilt.id, canfilt.mask, canfilt.flags);
  84                         }
  85                         break;
  86                 }
  87
  88                 case CANRTR_READ: {
  89                         int ret;
  90                         struct canmsg_t rtr_msg;
  91
  92                         copy_from_user(&rtr_msg, (void*)arg, sizeof(struct canmsg_t));
  93                         ret = can_ioctl_remote_read(canuser, &rtr_msg, rtr_msg.id, 0);
  94                         if(ret<0) return ret;
  95                         copy_to_user((void*)arg, &rtr_msg, sizeof(struct canmsg_t));
  96                 }
  97
  98                 case CONF_BAUD: {
  99                         channel = arg & 0xff;
 100                         btr0 = (arg >> 8) & 0xff;
 101                         btr1 = (arg >> 16) & 0xff;
 102
 103                         if (chip->chipspecops->set_btregs(chip, btr0, btr1)) {
 104                                 CANMSG("Error setting bit timing registers\n");
 105                                 return -1;
 106                         }
 107                         break;
 108                 }
 109
 110                 case CONF_BAUDPARAMS: {
 111                         struct can_baudparams_t params;
 112                         copy_from_user(&params, (void*)arg, sizeof(struct can_baudparams_t));
 113                         if(params.flags == -1) params.flags = 0;
 114                         if(params.baudrate == -1) params.baudrate = chip->baudrate;
 115                         if(params.sjw == -1) params.sjw = 0;
 116                         if(params.sample_pt == -1) params.sample_pt = 75;
 117                         i=chip->chipspecops->baud_rate(chip, params.baudrate, chip->clock, params.sjw,
 118                                                         params.sample_pt, params.flags);
 119                         if(i>=0) chip->baudrate = params.baudrate;
 120                         else {
 121                                 CANMSG("Error setting baud parameters\n");
 122                                 return -1;
 123                         }
 124                         break;
 125                 }
 126
 127
 128                 default: {
 129                         CANMSG("Not a valid ioctl command\n");
 130                         return -EINVAL;
 131                 }
 132
 133         }
 134
 135         return 0;
 136 }