?? ioctl.c
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/* ioctl.c * Linux CAN-bus device driver. * Written by Arnaud Westenberg email:arnaud@wanadoo.nl * This software is released under the GPL-License. * Version 0.7 6 Aug 2001 */#include <linux/autoconf.h>#if defined (CONFIG_MODVERSIONS) && !defined (MODVERSIONS)#define MODVERSIONS#endif#if defined (MODVERSIONS)#include <linux/modversions.h>#endif#include <linux/fs.h>#include <linux/version.h>#include "../include/main.h"#include "../include/ioctl.h"#include "../include/i82527.h"int can_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg){ int i=0; unsigned short channel=0; unsigned btr0=0, btr1=0; struct msgobj_t *obj; struct chip_t *chip = objects_p[MINOR_NR]->hostchip; struct canfifo_t *fifo = objects_p[MINOR_NR]->fifo; /* Initialize hardware pointers */ if ( (obj = objects_p[MINOR_NR]) == NULL) { CANMSG("Could not assign buffer structure\n"); return -1; } if ( (chip = obj->hostchip) == NULL) { CANMSG("Device is not correctly configured.\n"); CANMSG("Please reload the driver.\n"); return -1; } switch (cmd) { case STAT: { for (i=0x0; i<0x100; i++) CANMSG("0x%x is 0x%x\n",i,can_read_reg(chip,i)); break; } case CMD_START: { if (chips_p[arg]->chipspecops->start_chip(chip)) return -1; break; } case CMD_STOP: { if (chips_p[arg]->chipspecops->stop_chip(chip)) return -1; break; } case CONF_FILTER: { if (!strcmp(chip->chip_type,"i82527")) { unsigned char id1, id0; id1 = (unsigned char) (arg << 5); id0 = (unsigned char) (arg >> 3); DEBUGMSG("configuring ID=%lx in message object: %02x, %02x\n", arg, id0, id1); can_write_reg(chip,id1,MSG_OFFSET(obj->object) + iMSGID1); can_write_reg(chip,id0,MSG_OFFSET(obj->object) + iMSGID0); } /* In- and output buffer re-initialization */ fifo->tx_readp = fifo->buf_tx_entry; fifo->tx_writep = fifo->buf_tx_entry; fifo->rx_readp = fifo->buf_rx_entry; fifo->rx_writep = fifo->buf_rx_entry; fifo->rx_size= MAX_BUF_LENGTH * sizeof(struct canmsg_t); fifo->tx_size = fifo->rx_size; #if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,2,19)) init_waitqueue(&fifo->readq); init_waitqueue(&fifo->writeq); #else init_waitqueue_head(&fifo->readq); init_waitqueue_head(&fifo->writeq); #endif fifo->rx_in_progress = 0; fifo->tx_in_progress = 0; fifo->head = fifo->tail = 0; //TEMP!! break; } case CONF_BAUD: { channel = arg & 0xff; btr0 = (arg >> 8) & 0xff; btr1 = (arg >> 16) & 0xff; if (chips_p[channel]->chipspecops->set_btregs(chip, btr0, btr1)) { CANMSG("Error setting bit timing registers\n"); return -1; } break; } default: { CANMSG("Not a valid ioctl command\n"); return -EINVAL; } } return 0;}
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