/* 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;}