lincan/src/ioctl.c

   1 /* ioctl.c
   2  * Linux CAN-bus device driver.
   3  * Written by Arnaud Westenberg email:arnaud@wanadoo.nl
   4  * This software is released under the GPL-License.
   5  * Version 0.7  6 Aug 2001
   6  */
   7
   8 #include <linux/autoconf.h>
   9 #if defined (CONFIG_MODVERSIONS) && !defined (MODVERSIONS)
  10 #define MODVERSIONS
  11 #endif
  12
  13 #if defined (MODVERSIONS)
  14 #include <linux/modversions.h>
  15 #endif
  16
  17 #include <linux/fs.h>
  18 #include <linux/version.h>
  19 #include <linux/string.h>
  20
  21 #include "../include/main.h"
  22 #include "../include/ioctl.h"
  23 #include "../include/i82527.h"
  24
  25 int can_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
  26 {
  27         int i=0;
  28         unsigned short channel=0;
  29         unsigned btr0=0, btr1=0;
  30         struct msgobj_t *obj;
  31         struct chip_t *chip = objects_p[MINOR_NR]->hostchip;
  32         struct canfifo_t *fifo = objects_p[MINOR_NR]->fifo;
  33
  34         /* Initialize hardware pointers */
  35         if ( (obj = objects_p[MINOR_NR]) == NULL) {
  36                 CANMSG("Could not assign buffer structure\n");
  37                 return -1;
  38         }
  39         if ( (chip = obj->hostchip) == 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 STAT: {
  47                         for (i=0x0; i<0x100; i++)
  48                                 CANMSG("0x%x is 0x%x\n",i,can_read_reg(chip,i));
  49                         break;
  50                 }
  51                 case CMD_START: {
  52                         if (chips_p[arg]->chipspecops->start_chip(chip))
  53                                 return -1;
  54                         break;
  55                 }
  56                 case CMD_STOP: {
  57                         if (chips_p[arg]->chipspecops->stop_chip(chip))
  58                                 return -1;
  59                         break;
  60                 }
  61                 case CONF_FILTER: {
  62                         if (!strcmp(chip->chip_type,"i82527")) {
  63
  64                                 unsigned char id1, id0;
  65                                 id1 = (unsigned char) (arg << 5);
  66                                 id0 = (unsigned char) (arg >> 3);
  67
  68                                 DEBUGMSG("configuring ID=%lx in message object:
  69                                                  %02x, %02x\n", arg, id0, id1);
  70                                 can_write_reg(chip,id1,MSG_OFFSET(obj->object) +
  71                                                                 iMSGID1);
  72                                 can_write_reg(chip,id0,MSG_OFFSET(obj->object) +
  73                                                                 iMSGID0);
  74                         }
  75
  76                         /* In- and output buffer re-initialization */
  77
  78                         fifo->tx_readp = fifo->buf_tx_entry;
  79                         fifo->tx_writep = fifo->buf_tx_entry;
  80                         fifo->rx_readp = fifo->buf_rx_entry;
  81                         fifo->rx_writep = fifo->buf_rx_entry;
  82                         fifo->rx_size= MAX_BUF_LENGTH * sizeof(struct canmsg_t);
  83                         fifo->tx_size = fifo->rx_size;
  84
  85                         #if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,3,0))
  86                                 init_waitqueue(&fifo->readq);
  87                                 init_waitqueue(&fifo->writeq);
  88                         #else
  89                                 init_waitqueue_head(&fifo->readq);
  90                                 init_waitqueue_head(&fifo->writeq);
  91                         #endif
  92
  93                         fifo->rx_in_progress = 0;
  94                         fifo->tx_in_progress = 0;
  95
  96                         break;
  97                 }
  98
  99                 case CONF_BAUD: {
 100                         channel = arg & 0xff;
 101                         btr0 = (arg >> 8) & 0xff;
 102                         btr1 = (arg >> 16) & 0xff;
 103
 104                         if (chips_p[channel]->chipspecops->set_btregs(chip,
 105                                                                 btr0, btr1)) {
 106                                 CANMSG("Error setting bit timing registers\n");
 107                                 return -1;
 108                         }
 109                         break;
 110                 }
 111                 default: {
 112                         CANMSG("Not a valid ioctl command\n");
 113                         return -EINVAL;
 114                 }
 115
 116         }
 117
 118         return 0;
 119 }