**成功為0，否則為-1 ** *******************************************************************/static int arca_prn_reset(void){	unsigned long x;	int r;	__save_and_cli(x);	cmotor_direction = 0;	pmotor_direction = 1;	cstep_coil  = 0;	cstep_const = 0;	cstep_acc   = 0;	cstep_dec   = 0;	pstep_const = 0;	pstep_acc   = 0;	pstep_dec   = 0;	r = arca_prn_home_position();	__restore_flags(x);	return r;}/******************************************************************* ** ** *******************************************************************/static int arca_prn_blackmark(void){	bm_timeout = 0;	ENCODE_STATUS(PRN_BLACKMARK, MOTOR_STAT_ACC, NPMOTOR);	__prn_pmotor_irq_unmask();	return 0;}/******************************************************************* ** ** *******************************************************************/static int arca_prn_newline(void){	ENCODE_STATUS(PRN_NEWLINE, MOTOR_STAT_ACC, NPMOTOR);	__prn_pmotor_irq_unmask();	return 0;}/******************************************************************* ** ** *******************************************************************/static int arca_prn_paper_forward(unsigned int steps){	if (steps > 24) {		pmotor_steps = steps - 24;		ENCODE_STATUS(PRN_PAPERFETCH2, MOTOR_STAT_ACC, NPMOTOR);	} else {		pmotor_steps = steps;		ENCODE_STATUS(PRN_PAPERFETCH2, MOTOR_STAT_COIL, NPMOTOR);	}	__prn_pmotor_irq_unmask();	return 0;}/******************************************************************* ** ** *******************************************************************/static int arca_prn_paper_fallback(unsigned int steps){	if (steps > 24) {		pmotor_steps = steps - 24;		ENCODE_STATUS(PRN_PAPERFETCH2, MOTOR_STAT_ACC, NPMOTOR);	} else {		pmotor_steps = steps;		ENCODE_STATUS(PRN_PAPERFETCH2, MOTOR_STAT_COIL, NPMOTOR);	}	pmotor_direction = 0;	__prn_pmotor_irq_unmask();	return 0;}/******************************************************************* ** For module ** *******************************************************************/struct prn_dev {	int opened;	void *private;};static struct prn_dev prn;static unsigned char prn_dev_minor = 3;//從設(shè)備號為3static struct timer_list prn_timer;static int arca_prn_open(struct inode *inode, struct file *filp);static int arca_prn_release(struct inode *inode, struct file *filp);static int arca_prn_ioctl(struct inode *inode, struct file *filp,			  unsigned int cmd, unsigned long arg);static ssize_t arca_prn_write(struct file *filp, const char *buf,			      size_t count, loff_t *ppos);static struct file_operations arca_prn_fops ={	write:   arca_prn_write,	ioctl:   arca_prn_ioctl,	open:    arca_prn_open,	release: arca_prn_release};/******************************************************************* ** Motor state mechanism ** *******************************************************************/static void prn_decode_motor_state(unsigned char status, unsigned char motor){	switch (motor) {	case NCMOTOR:		switch (status) {		case MOTOR_STAT_STOP:			prn_cmotor_stop(cmotor_direction);			break;		case MOTOR_STAT_ACC:			prn_cmotor_acc(cmotor_direction);			break;		case MOTOR_STAT_CONST:			prn_cmotor_const(cmotor_direction);			break;		case MOTOR_STAT_COIL:			__prn_cmotor_data2irq_unmask();			prn_cmotor_coil(cmotor_direction);			break;		case MOTOR_STAT_DEC:						prn_cmotor_dec(cmotor_direction);			break;		case MOTOR_STAT_WORKRUSH:			prn_cmotor_work_rush(cmotor_direction);			break;		case MOTOR_STAT_HOLDRUSH:			prn_cmotor_hold_rush(cmotor_direction);			break;		}		break;	case NPMOTOR:		switch (status) {		case MOTOR_STAT_STOP:			prn_pmotor_stop(pmotor_direction);			break;		case MOTOR_STAT_ACC:			prn_pmotor_acc(pmotor_direction);			break;		case MOTOR_STAT_CONST:			prn_pmotor_const(pmotor_direction);			break;		case MOTOR_STAT_COIL:			prn_pmotor_coil(pmotor_direction);			break;		case MOTOR_STAT_DEC:			prn_pmotor_dec(pmotor_direction);			break;		case MOTOR_STAT_STEP:						prn_pmotor_step(pmotor_direction);			break;					}		break;	}}/******************************************************************* ** ** *******************************************************************/static void arca_prn_interrupt(int irq, void *dev_id, struct pt_regs *regs){	switch (PRN_STATUS()) {	case PRN_BLACKMARK:	case PRN_NEWLINE:	case PRN_PRINTING:	case PRN_PAPERFETCH0:	case PRN_PAPERFETCH1:	case PRN_PAPERFETCH2:		prn_decode_motor_state(MOTOR_STATUS(), MOTOR_NUM());		break;	default:		__prn_irq_mask();		break;	}}/******************************************************************* ** ** *******************************************************************/static int arca_prn_open(struct inode *inode, struct file *filp){	if (prn.opened) {		printk(KERN_INFO "arca_prn: The device BUSY\n");		return -EBUSY;	}	prn.opened = 1;	if ( (filp->f_flags & O_ACCMODE) == O_RDONLY )		printk(KERN_INFO "arca_prn: Need use WR to access this device.\n");	return 0;}/******************************************************************* ** ** *******************************************************************/static int arca_prn_release(struct inode *inode, struct file *filp){	prn.opened = 0;	return 0;}/******************************************************************* ** ** *******************************************************************/static int arca_prn_ioctl(struct inode *inode, struct file *filp,			  unsigned int cmd, unsigned long arg){	sigset_t orig_sigmask;	int rc = 0;	if (PRN_STATUS() != PRN_STANDBY)		if ((PRN_STATUS() != PRN_RST1) || (cmd != PRNIORESET))			return -EFAULT;	if (__prn_paper_end() && (PRN_STATUS() != PRN_RST1)) {		ENCODE_STATUS(PRN_PAPERFETCH1, MOTOR_STAT_ACC, NPMOTOR);		__prn_cmotor_irq_mask();		__prn_pmotor_irq_unmask();		return -EFAULT;	}	switch (cmd) {	case PRNIOPOWEROFF:		REG8(PRN_PMOTOR_PORT1) = 127;		REG8(PRN_PMOTOR_PORT2) = off_i | motor_steps[pmotor_step % 4];		REG8(PRN_CMOTOR_PORT1) = 127;		REG8(PRN_CMOTOR_PORT2) = off_i | motor_steps[cmotor_step % 4];		return rc;	case PRNIORESET:		ENCODE_STATUS(PRN_RST1, 0, 0);		if (arca_prn_reset())			return -EIO;		ENCODE_STATUS(PRN_STANDBY, 0, 0);		return rc;	case PRNIOBLKMARK:		arca_prn_blackmark();		break;	case PRNIONEWLINE:		arca_prn_newline();		break;	case PRNIOPAPERFW:		arca_prn_paper_forward(arg);		break;	case PRNIOPAPERFB:		arca_prn_paper_fallback(arg);		break;	default:		break;	}	orig_sigmask = current->blocked;	sigaddsetmask(&current->blocked,~_DONT_BLOCK);	recalc_sigpending(current);	interruptible_sleep_on(&prn_wait_queue);	current->blocked = orig_sigmask;	if (signal_pending(current)) {		ENCODE_STATUS(PRN_STANDBY, 0, 0);		recalc_sigpending(current);		return -EFAULT;	}	recalc_sigpending(current);	if (PRN_STATUS() == PRN_RST0)		return -EFAULT;	ENCODE_STATUS(PRN_STANDBY, 0, 0);	return rc;}/******************************************************************* ** ** *******************************************************************/static ssize_t arca_prn_write(struct file *filp, const char *buf,			      size_t count, loff_t *ppos){	sigset_t orig_sigmask;	__prn_irq_mask();  /* Add for security -- spark 2004.12.23 */	if (PRN_STATUS() != PRN_STANDBY)		return -EFAULT;	if (__prn_paper_end()) {		ENCODE_STATUS(PRN_PAPERFETCH1, MOTOR_STAT_ACC, NPMOTOR);		__prn_cmotor_irq_mask();		__prn_pmotor_irq_unmask();		return -EFAULT;	}	if (copy_from_user(prn_buffer, buf, count))		return -EFAULT;	prn_line_max_steps = count >> 2;	old_val = 0;	ENCODE_STATUS(PRN_PRINTING, MOTOR_STAT_WORKRUSH, NCMOTOR);	__prn_cmotor_irq_unmask();	orig_sigmask = current->blocked;	sigaddsetmask(&current->blocked,~_DONT_BLOCK);	recalc_sigpending(current);	interruptible_sleep_on(&prn_wait_queue);	current->blocked = orig_sigmask;	if (signal_pending(current)) {		ENCODE_STATUS(PRN_STANDBY, 0, 0);		recalc_sigpending(current);		return -EFAULT;	}	recalc_sigpending(current);	ENCODE_STATUS(PRN_STANDBY, 0, 0);	return count;}/******************************************************************* ** ** *******************************************************************/static unsigned char trigger_count = 0;static void prn_timer_routine(unsigned long dummy){	if ((PRN_STATUS() == PRN_RST0) && (!__prn_paper_end())) 	{		trigger_count ++;		if (trigger_count >= 3) 		{			dprintk("Find paper, enable interrupt.\n");			trigger_count = 0;			if (arca_prn_reset()) 				   ENCODE_STATUS(PRN_RST0, 0, 0);			else 				  {				   ENCODE_STATUS(PRN_PAPERFETCH0, MOTOR_STAT_ACC,NPMOTOR);				   __prn_pmotor_irq_unmask();			    }		 }  }	if ((__prn_paper_end()) && (PRN_STATUS() == PRN_STANDBY))		ENCODE_STATUS(PRN_RST0, 0, 0);	if (__prn_paper_end())		trigger_count = 0;	if ((PRN_STATUS() == PRN_STANDBY) || (PRN_STATUS() == PRN_RST0) ||	    (PRN_STATUS() == PRN_RST1)) {		REG8(PRN_PMOTOR_PORT1) = 127;		REG8(PRN_PMOTOR_PORT2) = off_i | motor_steps[pmotor_step % 4];		REG8(PRN_CMOTOR_PORT1) = 127;		REG8(PRN_CMOTOR_PORT2) = off_i | motor_steps[cmotor_step % 4];	}	init_timer(&prn_timer);	prn_timer.expires = jiffies + PRN_TIMER;	prn_timer.data = 0;	prn_timer.function = prn_timer_routine;	add_timer(&prn_timer);}/******************************************************************* ** ** *******************************************************************/static int __init arca_prn_init(void){	int result;	prn.opened = 0;	__prn_irq_mask();	if (request_irq(PRN_IRQ, arca_prn_interrupt,			SA_INTERRUPT, "arca_prn", &prn)) {		printk(KERN_INFO "arca_prn: IRQ %d is in used.\n", PRN_IRQ);		free_irq(PRN_IRQ, &prn);		return -ENODEV;	}	result = arca_register_chrdev(prn_dev_minor, "arca_prn",				      &arca_prn_fops, &prn);	__prn_pin_init();	if (__prn_paper_end()) 		ENCODE_STATUS(PRN_RST0, 0, 0);	else {		if (arca_prn_reset())			ENCODE_STATUS(PRN_RST1, 0, 0);		else			ENCODE_STATUS(PRN_STANDBY, 0, 0);	}	init_timer(&prn_timer);	prn_timer.expires = jiffies + PRN_TIMER;	prn_timer.data = 0;	prn_timer.function = prn_timer_routine;	add_timer(&prn_timer);		printk("arca_prn: Arca printer driver launched \n");	return 0;}/******************************************************************* ** ** *******************************************************************/static void __exit arca_prn_exit(void){	free_irq(PRN_IRQ, &prn);	del_timer(&prn_timer);	arca_unregister_chrdev(prn_dev_minor, "arca_prn");}MODULE_AUTHOR ("Seeger Chin <lqin@arca.com.cn>");MODULE_DESCRIPTION ("Arca printer driver");MODULE_LICENSE("ARCANDA");MODULE_PARM (debug, "i");module_init(arca_prn_init);module_exit(arca_prn_exit);