tpam_nco.c

内核linux2.4.20,可跟rtlinux3.2打补丁 组成实时linux系统,编译内核

	return skb;
}

/*
 * Extract a parameter from a TLV block.
 *
 * 	skb: sk_buff containing the PCI message
 * 	type: parameter to search for (PARAM_*)
 * 	value: to be filled with the value of the parameter
 * 	len: maximum length of the parameter value
 *
 * Return: 0 if OK, <0 if error.
 */
static int extract_NCOParameter(struct sk_buff *skb, u8 type, 
				void *value, u16 len) {
	void *buffer = (void *)skb->data;
	pci_mpb *p;
	void * bufferend;
	u8 valtype;
	u16 vallen;

	/* calculate the start and end of the TLV block */
	buffer += sizeof(skb_header);
	p = (pci_mpb *)buffer;
	buffer += sizeof(pci_mpb);
	bufferend = buffer + p->actualBlockTLVSize;

	/* walk through the parameters */
	while (buffer < bufferend) {

		/* parameter type */
		valtype = *((u8 *)buffer++);
		/* parameter length */
		vallen = *((u8 *)buffer++);
		if (vallen == 0xff) {
			/* parameter length is on 2 bytes */
			vallen = *((u8 *)buffer++);
			vallen <<= 8;
			vallen |= *((u8 *)buffer++);
		}
		/* got the right parameter */
		if (valtype == type) {
			/* not enough space for returning the value */
			if (vallen > len)
				return -1;
			/* OK, return it */
			memcpy(value, buffer, vallen);
			return 0;
		}
		buffer += vallen;
	}
	return -1;
}

/*
 * Parse a ACreateNCOCnf message.
 *
 * 	skb: the sk_buff containing the message
 * 	status: to be filled with the status field value
 * 	ncoid: to be filled with the ncoid field value
 *
 * Return: 0 if OK, <0 if error.
 */
int parse_ACreateNCOCnf(struct sk_buff *skb, u8 *status, u32 *ncoid) {

	/* extract the status */
	if (extract_NCOParameter(skb, PAR_CompletionStatus, status, 1)) {
		printk(KERN_ERR "TurboPAM(parse_ACreateNCOCnf): "
		       "CompletionStatus not found\n");
		return -1;
	}

	if (*status) {
		dprintk("TurboPAM(parse_ACreateNCOCnf): status=%d\n", *status);
		return 0;
	}

	/* extract the ncoid */
	if (extract_NCOParameter(skb, PAR_NCOID, ncoid, 4)) {
		printk(KERN_ERR "TurboPAM(parse_ACreateNCOCnf): "
		       "NCOID not found\n");
		return -1;
	}

	dprintk("TurboPAM(parse_ACreateNCOCnf): ncoid=%lu, status=%d\n",
		(unsigned long)*ncoid, *status);
	return 0;
}

/*
 * Parse a ADestroyNCOCnf message. Not used in the driver.
 *
 * 	skb: the sk_buff containing the message
 * 	status: to be filled with the status field value
 * 	ncoid: to be filled with the ncoid field value
 *
 * Return: 0 if OK, <0 if error.
 */
int parse_ADestroyNCOCnf(struct sk_buff *skb, u8 *status, u32 *ncoid) {

	/* extract the status */
	if (extract_NCOParameter(skb, PAR_CompletionStatus, status, 1)) {
		printk(KERN_ERR "TurboPAM(parse_ADestroyNCOCnf): "
		       "CompletionStatus not found\n");
		return -1;
	}

	if (*status) {
		dprintk("TurboPAM(parse_ADestroyNCOCnf): status=%d\n", *status);
		return 0;
	}

	/* extract the ncoid */
	if (extract_NCOParameter(skb, PAR_NCOID, ncoid, 4)) {
		printk(KERN_ERR "TurboPAM(parse_ADestroyNCOCnf): "
		       "NCOID not found\n");
		return -1;
	}

	dprintk("TurboPAM(parse_ADestroyNCOCnf): ncoid=%lu, status=%d\n", 
		(unsigned long)*ncoid, *status);
	return 0;
}

/*
 * Parse a CConnectCnf message.
 *
 * 	skb: the sk_buff containing the message
 * 	ncoid: to be filled with the ncoid field value
 *
 * Return: 0 if OK, <0 if error.
 */
int parse_CConnectCnf(struct sk_buff *skb, u32 *ncoid) {

	/* extract the ncoid */
	if (extract_NCOParameter(skb, PAR_NCOID, ncoid, 4)) {
		printk(KERN_ERR "TurboPAM(parse_CConnectCnf): "
		       "NCOID not found\n");
		return -1;
	}
	dprintk("TurboPAM(parse_CConnectCnf): ncoid=%lu\n", 
		(unsigned long)*ncoid);
	return 0;
}

/*
 * Parse a CConnectInd message.
 *
 * 	skb: the sk_buff containing the message
 * 	ncoid: to be filled with the ncoid field value
 * 	hdlc: to be filled with 1 if the incoming connection is a HDLC one,
 * 		with 0 if the incoming connection is a modem one
 * 	calling: to be filled with the calling phone number value
 * 	called: to be filled with the called phone number value
 * 	plan: to be filled with the plan value
 * 	screen: to be filled with the screen value
 *
 * Return: 0 if OK, <0 if error.
 */
int parse_CConnectInd(struct sk_buff *skb, u32 *ncoid, u8 *hdlc, 
		      u8 *calling, u8 *called, u8 *plan, u8 *screen) {
	u8 phone[PHONE_MAXIMUMSIZE + 4];

	/* extract the ncoid */
	if (extract_NCOParameter(skb, PAR_NCOID, ncoid, 4)) {
		printk(KERN_ERR "TurboPAM(parse_CConnectInd): "
		       "NCOID not found\n");
		return -1;
	}

	/* extract the bearer capability field */
	if (extract_NCOParameter(skb, PAR_BearerCap, hdlc, 1)) {
		printk(KERN_ERR "TurboPAM(parse_CConnectInd): "
		       "BearerCap not found\n");
		return -1;
	}
	*hdlc = (*hdlc == 0x88) ? 1 : 0;

	/* extract the calling number / plan / screen */
	if (extract_NCOParameter(skb, PAR_CallingNumber, phone, 
				 PHONE_MAXIMUMSIZE + 4)) {
		printk(KERN_ERR "TurboPAM(parse_CConnectInd): "
		       "CallingNumber not found\n");
		return -1;
	}
	memcpy(calling, phone + 4, PHONE_MAXIMUMSIZE);
	*plan = phone[1];
	*screen = phone[3];

	/* extract the called number */
	if (extract_NCOParameter(skb, PAR_CalledNumber, phone, 
				 PHONE_MAXIMUMSIZE + 2)) {
		printk(KERN_ERR "TurboPAM(parse_CConnectInd): "
		       "CalledNumber not found\n");
		return -1;
	}
	memcpy(called, phone + 2, PHONE_MAXIMUMSIZE);

	dprintk("TurboPAM(parse_CConnectInd): "
		"ncoid=%lu, hdlc=%d, plan=%d, scr=%d, calling=%s, called=%s\n",
		(unsigned long)*ncoid, *hdlc, *plan, *screen, calling, called);
	return 0;
}

/*
 * Parse a CDisconnectCnf message.
 *
 * 	skb: the sk_buff containing the message
 * 	ncoid: to be filled with the ncoid field value
 * 	causetopuf: to be filled with the cause field value
 *
 * Return: 0 if OK, <0 if error.
 */
int parse_CDisconnectCnf(struct sk_buff *skb, u32 *ncoid, u32 *causetopuf) {

	/* extract the ncoid */
	if (extract_NCOParameter(skb, PAR_NCOID, ncoid, 4)) {
		printk(KERN_ERR "TurboPAM(parse_CDisconnectCnf): "
		       "NCOID not found\n");
		return -1;
	}

	/* extract the cause of disconnection */
	if (extract_NCOParameter(skb, PAR_CauseToPUF, causetopuf, 4)) {
		printk(KERN_ERR "TurboPAM(parse_CDisconnectCnf): "
		       "CauseToPUF not found\n");
		return -1;
	}

	dprintk("TurboPAM(parse_CDisconnectCnf): ncoid=%lu, causetopuf=%lu\n", 
		(unsigned long)*ncoid, (unsigned long)*causetopuf);
	return 0;
}

/*
 * Parse a CDisconnectInd message.
 *
 * 	skb: the sk_buff containing the message
 * 	ncoid: to be filled with the ncoid field value
 * 	causetopuf: to be filled with the cause field value
 *
 * Return: 0 if OK, <0 if error.
 */
int parse_CDisconnectInd(struct sk_buff *skb, u32 *ncoid, u32 *causetopuf) {

	/* extract the ncoid */
	if (extract_NCOParameter(skb, PAR_NCOID, ncoid, 4)) {
		printk(KERN_ERR "TurboPAM(parse_CDisconnectInd): "
		       "NCOID not found\n");
		return -1;
	}

	/* extract the cause of disconnection */
	if (extract_NCOParameter(skb, PAR_CauseToPUF, causetopuf, 4)) {
		printk(KERN_ERR "TurboPAM(parse_CDisconnectInd): "
		       "CauseToPUF not found\n");
		return -1;
	}

	dprintk("TurboPAM(parse_CDisconnectInd): ncoid=%lu, causetopuf=%lu\n", 
		(unsigned long)*ncoid, (unsigned long)*causetopuf);
	return 0;
}

/*
 * Parse a U3ReadyToReceiveInd message.
 *
 * 	skb: the sk_buff containing the message
 * 	ncoid: to be filled with the ncoid field value
 * 	ready: to be filled with the ready field value
 *
 * Return: 0 if OK, <0 if error.
 */
int parse_U3ReadyToReceiveInd(struct sk_buff *skb, u32 *ncoid, u8 *ready) {

	/* extract the ncoid */
	if (extract_NCOParameter(skb, PAR_NCOID, ncoid, 4)) {
		printk(KERN_ERR "TurboPAM(parse_U3ReadyToReceiveInd): "
		       "NCOID not found\n");
		return -1;
	}

	/* extract the ready flag */
	if (extract_NCOParameter(skb, PAR_ReadyFlag, ready, 1)) {
		printk(KERN_ERR "TurboPAM(parse_U3ReadyToReceiveInd): "
		       "ReadyFlag not found\n");
		return -1;
	}

	dprintk("TurboPAM(parse_U3ReadyToReceiveInd): ncoid=%lu, ready=%d\n", 
		(unsigned long)*ncoid, *ready);
	return 0;
}

/*
 * Parse a U3DataInd message.
 *
 * 	skb: the sk_buff containing the message + data
 * 	ncoid: to be filled with the ncoid field value
 * 	data: to be filled with the data 
 * 	ready: to be filled with the data length
 *
 * Return: 0 if OK, <0 if error.
 */
int parse_U3DataInd(struct sk_buff *skb, u32 *ncoid, u8 **data, u16 *len) {
	pci_mpb *p;

	/* extract the ncoid */
	if (extract_NCOParameter(skb, PAR_NCOID, ncoid, 4) == -1) {
		printk(KERN_ERR "TurboPAM(parse_U3DataInd): NCOID not found\n");
		return -1;
	}

	/* get a pointer to the beginning of the data block and its length */
	p = (pci_mpb *)(skb->data + sizeof(skb_header));
	*len = p->actualDataSize;
	skb_pull(skb, 
		 sizeof(skb_header) + sizeof(pci_mpb) + p->actualBlockTLVSize);
	*data = skb->data;

	dprintk("TurboPAM(parse_U3DataInd): ncoid=%lu, datalen=%d\n", 
		(unsigned long)*ncoid, *len);
	return 0;
}