keyspan.c

linux-2.4.29操作系统的源码

			(serial, d_details->inack_endpoints[i], USB_DIR_IN,
			 port, p_priv->inack_buffer, 1, cback->inack_callback);

		/* outcont endpoint */
		p_priv->outcont_urb = keyspan_setup_urb
			(serial, d_details->outcont_endpoints[i], USB_DIR_OUT,
			 port, p_priv->outcont_buffer, 64,
			 cback->outcont_callback);
	}	

}

/* usa19 function doesn't require prescaler */
static int keyspan_usa19_calc_baud(u32 baud_rate, u32 baudclk, u8 *rate_hi,
				   u8 *rate_low, u8 *prescaler, int portnum)
{
	u32 	b16,	/* baud rate times 16 (actual rate used internally) */
		div,	/* divisor */	
		cnt;	/* inverse of divisor (programmed into 8051) */
		
	dbg ("%s - %d.", __FUNCTION__, baud_rate);

		/* prevent divide by zero...  */
	if( (b16 = (baud_rate * 16L)) == 0) {
		return (KEYSPAN_INVALID_BAUD_RATE);
	}

		/* Any "standard" rate over 57k6 is marginal on the USA-19
		   as we run out of divisor resolution. */
	if (baud_rate > 57600) {
		return (KEYSPAN_INVALID_BAUD_RATE);
	}

		/* calculate the divisor and the counter (its inverse) */
	if( (div = (baudclk / b16)) == 0) {
		return (KEYSPAN_INVALID_BAUD_RATE);
	}
	else {
		cnt = 0 - div;
	}

	if(div > 0xffff) {
		return (KEYSPAN_INVALID_BAUD_RATE);
	}

		/* return the counter values if non-null */
	if (rate_low) {
		*rate_low = (u8) (cnt & 0xff);
	}
	if (rate_hi) {
		*rate_hi = (u8) ((cnt >> 8) & 0xff);
	}
	if (rate_low && rate_hi) {
		dbg ("%s - %d %02x %02x.", __FUNCTION__, baud_rate, *rate_hi, *rate_low);
	}
	
	return (KEYSPAN_BAUD_RATE_OK);
}

/* usa19hs function doesn't require prescaler */
static int keyspan_usa19hs_calc_baud(u32 baud_rate, u32 baudclk, u8 *rate_hi,
				   u8 *rate_low, u8 *prescaler, int portnum)
{
	u32 	b16,	/* baud rate times 16 (actual rate used internally) */
			div;	/* divisor */	
		
	dbg ("%s - %d.", __FUNCTION__, baud_rate);

		/* prevent divide by zero...  */
	if( (b16 = (baud_rate * 16L)) == 0) 
		return (KEYSPAN_INVALID_BAUD_RATE);
	


		/* calculate the divisor */
	if( (div = (baudclk / b16)) == 0) 
		return (KEYSPAN_INVALID_BAUD_RATE);

	if(div > 0xffff) 
		return (KEYSPAN_INVALID_BAUD_RATE);

		/* return the counter values if non-null */
	if (rate_low) 
		*rate_low = (u8) (div & 0xff);
	
	if (rate_hi) 
		*rate_hi = (u8) ((div >> 8) & 0xff);
	
	if (rate_low && rate_hi) 
		dbg ("%s - %d %02x %02x.", __FUNCTION__, baud_rate, *rate_hi, *rate_low);
	
	return (KEYSPAN_BAUD_RATE_OK);
}

static int keyspan_usa19w_calc_baud(u32 baud_rate, u32 baudclk, u8 *rate_hi,
				    u8 *rate_low, u8 *prescaler, int portnum)
{
	u32 	b16,	/* baud rate times 16 (actual rate used internally) */
		clk,	/* clock with 13/8 prescaler */
		div,	/* divisor using 13/8 prescaler */	
		res,	/* resulting baud rate using 13/8 prescaler */
		diff,	/* error using 13/8 prescaler */
		smallest_diff;
	u8	best_prescaler;
	int	i;

	dbg ("%s - %d.", __FUNCTION__, baud_rate);

		/* prevent divide by zero */
	if( (b16 = baud_rate * 16L) == 0) {
		return (KEYSPAN_INVALID_BAUD_RATE);
	}

		/* Calculate prescaler by trying them all and looking
		   for best fit */
		
		/* start with largest possible difference */
	smallest_diff = 0xffffffff;

		/* 0 is an invalid prescaler, used as a flag */
	best_prescaler = 0;

	for(i = 8; i <= 0xff; ++i) {
		clk = (baudclk * 8) / (u32) i;
		
		if( (div = clk / b16) == 0) {
			continue;
		}

		res = clk / div;
		diff= (res > b16) ? (res-b16) : (b16-res);

		if(diff < smallest_diff) {
			best_prescaler = i;
			smallest_diff = diff;
		}
	}

	if(best_prescaler == 0) {
		return (KEYSPAN_INVALID_BAUD_RATE);
	}

	clk = (baudclk * 8) / (u32) best_prescaler;
	div = clk / b16;

		/* return the divisor and prescaler if non-null */
	if (rate_low) {
		*rate_low = (u8) (div & 0xff);
	}
	if (rate_hi) {
		*rate_hi = (u8) ((div >> 8) & 0xff);
	}
	if (prescaler) {
		*prescaler = best_prescaler;
		/*  dbg("%s - %d %d", __FUNCTION__, *prescaler, div); */
	}
	return (KEYSPAN_BAUD_RATE_OK);
}

	/* USA-28 supports different maximum baud rates on each port */
static int keyspan_usa28_calc_baud(u32 baud_rate, u32 baudclk, u8 *rate_hi,
				    u8 *rate_low, u8 *prescaler, int portnum)
{
	u32 	b16,	/* baud rate times 16 (actual rate used internally) */
		div,	/* divisor */	
		cnt;	/* inverse of divisor (programmed into 8051) */

	dbg ("%s - %d.", __FUNCTION__, baud_rate);

		/* prevent divide by zero */
	if ((b16 = baud_rate * 16L) == 0)
		return (KEYSPAN_INVALID_BAUD_RATE);

		/* calculate the divisor and the counter (its inverse) */
	if ((div = (KEYSPAN_USA28_BAUDCLK / b16)) == 0) {
		return (KEYSPAN_INVALID_BAUD_RATE);
	}
	else {
		cnt = 0 - div;
	}

		/* check for out of range, based on portnum, 
		   and return result */
	if(portnum == 0) {
		if(div > 0xffff)
			return (KEYSPAN_INVALID_BAUD_RATE);
	}
	else {
		if(portnum == 1) {
			if(div > 0xff) {
				return (KEYSPAN_INVALID_BAUD_RATE);
			}
		}
		else {
			return (KEYSPAN_INVALID_BAUD_RATE);
		}
	}

		/* return the counter values if not NULL
		   (port 1 will ignore retHi) */
	if (rate_low) {
		*rate_low = (u8) (cnt & 0xff);
	}
	if (rate_hi) {
		*rate_hi = (u8) ((cnt >> 8) & 0xff);
	}
	dbg ("%s - %d OK.", __FUNCTION__, baud_rate);
	return (KEYSPAN_BAUD_RATE_OK);
}

static int keyspan_usa26_send_setup(struct usb_serial *serial,
				    struct usb_serial_port *port,
				    int reset_port)
{
	struct keyspan_usa26_portControlMessage	msg;		
	struct keyspan_serial_private 		*s_priv;
	struct keyspan_port_private 		*p_priv;
	const struct keyspan_device_details	*d_details;
	int 					outcont_urb;
	struct urb				*this_urb;
	int 					device_port, err;

	dbg ("%s reset=%d", __FUNCTION__, reset_port); 

	s_priv = (struct keyspan_serial_private *)(serial->private);
	p_priv = (struct keyspan_port_private *)(port->private);
	d_details = s_priv->device_details;
	device_port = port->number - port->serial->minor;

	outcont_urb = d_details->outcont_endpoints[port->number];
	this_urb = p_priv->outcont_urb;

	dbg("%s - endpoint %d", __FUNCTION__, usb_pipeendpoint(this_urb->pipe));

		/* Make sure we have an urb then send the message */
	if (this_urb == NULL) {
		dbg("%s - oops no urb.", __FUNCTION__);
		return -1;
	}

	/* Save reset port val for resend.
	Don't overwrite resend for open/close condition. */
	if ((reset_port + 1) > p_priv->resend_cont)
		p_priv->resend_cont = reset_port + 1;
	if (this_urb->status == -EINPROGRESS) {
		/*  dbg ("%s - already writing", __FUNCTION__); */
		mdelay(5);
		return(-1);
	}

	memset(&msg, 0, sizeof (struct keyspan_usa26_portControlMessage));
	
		/* Only set baud rate if it's changed */	
	if (p_priv->old_baud != p_priv->baud) {
		p_priv->old_baud = p_priv->baud;
		msg.setClocking = 0xff;
		if (d_details->calculate_baud_rate
		    (p_priv->baud, d_details->baudclk, &msg.baudHi,
		     &msg.baudLo, &msg.prescaler, device_port) == KEYSPAN_INVALID_BAUD_RATE ) {
			dbg("%s - Invalid baud rate %d requested, using 9600.", __FUNCTION__,
			    p_priv->baud);
			msg.baudLo = 0;
			msg.baudHi = 125;	/* Values for 9600 baud */
			msg.prescaler = 10;
		}
		msg.setPrescaler = 0xff;
	}

	msg.lcr = (p_priv->cflag & CSTOPB)? STOPBITS_678_2: STOPBITS_5678_1;
	switch (p_priv->cflag & CSIZE) {
	case CS5:
		msg.lcr |= USA_DATABITS_5;
		break;
	case CS6:
		msg.lcr |= USA_DATABITS_6;
		break;
	case CS7:
		msg.lcr |= USA_DATABITS_7;
		break;
	case CS8:
		msg.lcr |= USA_DATABITS_8;
		break;
	}
	if (p_priv->cflag & PARENB) {
		/* note USA_PARITY_NONE == 0 */
		msg.lcr |= (p_priv->cflag & PARODD)?
			USA_PARITY_ODD: USA_PARITY_EVEN;
	}
	msg.setLcr = 0xff;

	msg.ctsFlowControl = (p_priv->flow_control == flow_cts);
	msg.xonFlowControl = 0;
	msg.setFlowControl = 0xff;
	msg.forwardingLength = 16;
	msg.xonChar = 17;
	msg.xoffChar = 19;

	/* Opening port */
	if (reset_port == 1) {
		msg._txOn = 1;
		msg._txOff = 0;
		msg.txFlush = 0;
		msg.txBreak = 0;
		msg.rxOn = 1;
		msg.rxOff = 0;
		msg.rxFlush = 1;
		msg.rxForward = 0;
		msg.returnStatus = 0;
		msg.resetDataToggle = 0xff;
	}

	/* Closing port */
	else if (reset_port == 2) {
		msg._txOn = 0;
		msg._txOff = 1;
		msg.txFlush = 0;
		msg.txBreak = 0;
		msg.rxOn = 0;
		msg.rxOff = 1;
		msg.rxFlush = 1;
		msg.rxForward = 0;
		msg.returnStatus = 0;
		msg.resetDataToggle = 0;
	}

	/* Sending intermediate configs */
	else {
		msg._txOn = (! p_priv->break_on);
		msg._txOff = 0;
		msg.txFlush = 0;
		msg.txBreak = (p_priv->break_on);
		msg.rxOn = 0;
		msg.rxOff = 0;
		msg.rxFlush = 0;
		msg.rxForward = 0;
		msg.returnStatus = 0;
		msg.resetDataToggle = 0x0;
	}

		/* Do handshaking outputs */	
	msg.setTxTriState_setRts = 0xff;
	msg.txTriState_rts = p_priv->rts_state;

	msg.setHskoa_setDtr = 0xff;
	msg.hskoa_dtr = p_priv->dtr_state;
		
	p_priv->resend_cont = 0;
	memcpy (this_urb->transfer_buffer, &msg, sizeof(msg));
	
	/* send the data out the device on control endpoint */
	this_urb->transfer_buffer_length = sizeof(msg);

	this_urb->dev = serial->dev;
	if ((err = usb_submit_urb(this_urb)) != 0) {
		dbg("%s - usb_submit_urb(setup) failed (%d)", __FUNCTION__, err);
	}
#if 0
	else {
		dbg("%s - usb_submit_urb(%d) OK %d bytes (end %d)", __FUNCTION__
		    outcont_urb, this_urb->transfer_buffer_length,
		    usb_pipeendpoint(this_urb->pipe));
	}
#endif

	return (0);
}

static int keyspan_usa28_send_setup(struct usb_serial *serial,
				    struct usb_serial_port *port,
				    int reset_port)
{
	struct keyspan_usa28_portControlMessage	msg;		
	struct keyspan_serial_private	 	*s_priv;
	struct keyspan_port_private 		*p_priv;
	const struct keyspan_device_details	*d_details;
	struct urb				*this_urb;
	int 					device_port, err;

	dbg ("%s", __FUNCTION__);

	s_priv = (struct keyspan_serial_private *)(serial->private);
	p_priv = (struct keyspan_port_private *)(port->private);
	d_details = s_priv->device_details;
	device_port = port->number - port->serial->minor;

	/* only do something if we have a bulk out endpoint */
	if ((this_urb = p_priv->outcont_urb) == NULL) {
		dbg("%s - oops no urb.", __FUNCTION__);
		return -1;
	}

	/* Save reset port val for resend.
	   Don't overwrite resend for open/close condition. */
	if ((reset_port + 1) > p_priv->resend_cont)
		p_priv->resend_cont = reset_port + 1;
	if (this_urb->status == -EINPROGRESS) {
		dbg ("%s already writing", __FUNCTION__);
		mdelay(5);
		return(-1);
	}

	memset(&msg, 0, sizeof (struct keyspan_usa28_portControlMessage));

	msg.setBaudRate = 1;
	if (d_details->calculate_baud_rate(p_priv->baud, d_details->baudclk,
		&msg.baudHi, &msg.baudLo, NULL, device_port) == KEYSPAN_INVALID_BAUD_RATE ) {
		dbg("%s - Invalid baud rate requested %d.", __FUNCTION__, p_priv->baud);
		msg.baudLo = 0xff;
		msg.baudHi = 0xb2;	/* Values for 9600 baud */
	}

	/* If parity is enabled, we must calculate it ourselves. */
	msg.parity = 0;		/* XXX for now */

	msg.ctsFlowControl = (p_priv->flow_control == flow_cts);
	msg.xonFlowControl = 0;

	/* Do handshaking outputs, DTR is inverted relative to RTS */	
	msg.rts = p_priv->rts_state;
	msg.dtr = p_priv->dtr_state;

	msg.forwardingLength = 16;
	msg.forwardMs = 10;
	msg.breakThreshold = 45;
	msg.xonChar = 17;
	msg.xoffChar = 19;

	/*msg.returnStatus = 1;
	msg.resetDataToggle = 0xff;*/
	/* Opening port */
	if (reset_port == 1) {
		msg._txOn = 1;
		msg._txOff = 0;
		msg.txFlush = 0;
		msg.txForceXoff = 0;
		msg.txBreak = 0;
		msg.rxOn = 1;
		msg.rxOff = 0;
		msg.rxFlush = 1;
		msg.rxForward = 0;
		msg.returnStatus = 0;
		msg.resetDataToggle = 0xff;
	}
	/* Closing port */
	else if (reset_port == 2) {
		msg._txOn = 0;
		msg._txOff = 1;
		msg.txFlush = 0;
		msg.txForceXoff = 0;
		msg.txBreak = 0;
		msg.rxOn = 0;
		msg.rxOff = 1;
		msg.rxFlush = 1;
		msg.rxForward = 0;
		msg.returnStatus = 0;
		msg.resetDataToggle = 0;
	}
	/* Sending intermediate configs */
	else {
		msg._txOn = (! p_priv->break_on);
		msg._txOff = 0;
		msg.txFlush = 0;
		msg.txForceXoff = 0;
		msg.txBreak = (p_priv->break_on);
		msg.rxOn = 0;
		msg.rxOff = 0;
		msg.rxFlush = 0;
		msg.rxForward = 0;
		msg.returnStatus = 0;
		msg.resetDataToggle = 0x0;
	}

	p_priv->resend_cont = 0;