kl5kusb105.c

linux2.4.20下的针对三星公司的s3c2410的usb模块驱动代码

			memcpy (urb->transfer_buffer + KLSI_105_DATA_OFFSET,
			       	buf, size);
		}

		/* write payload size into transfer buffer */
		((__u8 *)urb->transfer_buffer)[0] = (__u8) (size & 0xFF);
		((__u8 *)urb->transfer_buffer)[1] = (__u8) ((size & 0xFF00)>>8);

		/* set up our urb */
		FILL_BULK_URB(urb, serial->dev,
			      usb_sndbulkpipe(serial->dev,
					      port->bulk_out_endpointAddress),
			      urb->transfer_buffer,
			      URB_TRANSFER_BUFFER_SIZE,
			      klsi_105_write_bulk_callback,
			      port);
		urb->transfer_flags |= USB_QUEUE_BULK;


		/* send the data out the bulk port */
		result = usb_submit_urb(urb);
		if (result) {
			err("%s - failed submitting write urb, error %d", __FUNCTION__, result);
			goto exit;
		}
		buf += size;
		bytes_sent += size;
		count -= size;
	}
exit:
	priv->bytes_out+=bytes_sent;

	return bytes_sent;	/* that's how much we wrote */
} /* klsi_105_write */

static void klsi_105_write_bulk_callback ( struct urb *urb)
{
	struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
	struct usb_serial *serial = port->serial;

	dbg("%s - port %d", __FUNCTION__, port->number);
	
	if (!serial) {
		dbg("%s - bad serial pointer, exiting", __FUNCTION__);
		return;
	}

	if (urb->status) {
		dbg("%s - nonzero write bulk status received: %d", __FUNCTION__,
		    urb->status);
		return;
	}

	/* from generic_write_bulk_callback */
	queue_task(&port->tqueue, &tq_immediate);
	mark_bh(IMMEDIATE_BH);

	return;
} /* klsi_105_write_bulk_completion_callback */


/* return number of characters currently in the writing process */
static int klsi_105_chars_in_buffer (struct usb_serial_port *port)
{
	int chars = 0;
	int i;
	unsigned long flags;
	struct klsi_105_private *priv = 
		(struct klsi_105_private*) port->private;

	spin_lock_irqsave (&priv->write_urb_pool_lock, flags);

	for (i = 0; i < NUM_URBS; ++i) {
		if (priv->write_urb_pool[i]->status == -EINPROGRESS) {
			chars += URB_TRANSFER_BUFFER_SIZE;
		}
	}

	spin_unlock_irqrestore (&priv->write_urb_pool_lock, flags);

	dbg("%s - returns %d", __FUNCTION__, chars);
	return (chars);
}

static int klsi_105_write_room (struct usb_serial_port *port)
{
	unsigned long flags;
	int i;
	int room = 0;
	struct klsi_105_private *priv = 
		(struct klsi_105_private*) port->private;

	spin_lock_irqsave (&priv->write_urb_pool_lock, flags);
	for (i = 0; i < NUM_URBS; ++i) {
		if (priv->write_urb_pool[i]->status != -EINPROGRESS) {
			room += URB_TRANSFER_BUFFER_SIZE;
		}
	}

	spin_unlock_irqrestore (&priv->write_urb_pool_lock, flags);

	dbg("%s - returns %d", __FUNCTION__, room);
	return (room);
}



static void klsi_105_read_bulk_callback (struct urb *urb)
{
	struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
	struct usb_serial *serial = port->serial;
	struct klsi_105_private *priv = 
		(struct klsi_105_private*) port->private;
	struct tty_struct *tty;
	unsigned char *data = urb->transfer_buffer;
	int rc;

        dbg("%s - port %d", __FUNCTION__, port->number);

	/* The urb might have been killed. */
        if (urb->status) {
                dbg("%s - nonzero read bulk status received: %d", __FUNCTION__,
		    urb->status);
                return;
        }
	if (!serial) {
		dbg("%s - bad serial pointer, exiting", __FUNCTION__);
		return;
	}
	
	/* The data received is again preceded by a length double-byte in LSB-
	 * first order (see klsi_105_write() )
	 */
	if (urb->actual_length == 0) {
		/* empty urbs seem to happen, we ignore them */
		/* dbg("%s - emtpy URB", __FUNCTION__); */
	       ;
	} else if (urb->actual_length <= 2) {
		dbg("%s - size %d URB not understood", __FUNCTION__,
		    urb->actual_length);
		usb_serial_debug_data (__FILE__, __FUNCTION__, urb->actual_length, data);
	} else {
		int i;
		int bytes_sent = ((__u8 *) data)[0] +
				 ((unsigned int) ((__u8 *) data)[1] << 8);
		tty = port->tty;
		/* we should immediately resubmit the URB, before attempting
		 * to pass the data on to the tty layer. But that needs locking
		 * against re-entry an then mixed-up data because of
		 * intermixed tty_flip_buffer_push()s
		 * FIXME
		 */ 
		usb_serial_debug_data (__FILE__, __FUNCTION__,
				       urb->actual_length, data);

		if (bytes_sent + 2 > urb->actual_length) {
			dbg("%s - trying to read more data than available"
			    " (%d vs. %d)", __FUNCTION__,
			    bytes_sent+2, urb->actual_length);
			/* cap at implied limit */
			bytes_sent = urb->actual_length - 2;
		}

		for (i = 2; i < 2+bytes_sent; i++) {
			/* if we insert more than TTY_FLIPBUF_SIZE characters,
			 * we drop them. */
			if(tty->flip.count >= TTY_FLIPBUF_SIZE) {
				tty_flip_buffer_push(tty);
			}
			/* this doesn't actually push the data through unless 
			 * tty->low_latency is set */
			tty_insert_flip_char(tty, ((__u8*) data)[i], 0);
		}
		tty_flip_buffer_push(tty);
		priv->bytes_in += bytes_sent;
	}
	/* Continue trying to always read  */
	FILL_BULK_URB(port->read_urb, serial->dev, 
		      usb_rcvbulkpipe(serial->dev,
				      port->bulk_in_endpointAddress),
		      port->read_urb->transfer_buffer,
		      port->read_urb->transfer_buffer_length,
		      klsi_105_read_bulk_callback,
		      port);
	rc = usb_submit_urb(port->read_urb);
	if (rc)
		err("%s - failed resubmitting read urb, error %d", __FUNCTION__, rc);
} /* klsi_105_read_bulk_callback */


static void klsi_105_set_termios (struct usb_serial_port *port,
				  struct termios *old_termios)
{
	struct usb_serial *serial = port->serial;
	struct klsi_105_private *priv = (struct klsi_105_private *)port->private;
	unsigned int iflag = port->tty->termios->c_iflag;
	unsigned int old_iflag = old_termios->c_iflag;
	unsigned int cflag = port->tty->termios->c_cflag;
	unsigned int old_cflag = old_termios->c_cflag;
	
	/*
	 * Update baud rate
	 */
	if( (cflag & CBAUD) != (old_cflag & CBAUD) ) {
	        /* reassert DTR and (maybe) RTS on transition from B0 */
		if( (old_cflag & CBAUD) == B0 ) {
			dbg("%s: baud was B0", __FUNCTION__);
#if 0
			priv->control_state |= TIOCM_DTR;
			/* don't set RTS if using hardware flow control */
			if (!(old_cflag & CRTSCTS)) {
				priv->control_state |= TIOCM_RTS;
			}
			mct_u232_set_modem_ctrl(serial, priv->control_state);
#endif
		}
		
		switch(cflag & CBAUD) {
		case B0: /* handled below */
			break;
		case B1200: priv->cfg.baudrate = kl5kusb105a_sio_b1200;
			break;
		case B2400: priv->cfg.baudrate = kl5kusb105a_sio_b2400;
			break;
		case B4800: priv->cfg.baudrate = kl5kusb105a_sio_b4800;
			break;
		case B9600: priv->cfg.baudrate = kl5kusb105a_sio_b9600;
			break;
		case B19200: priv->cfg.baudrate = kl5kusb105a_sio_b19200;
			break;
		case B38400: priv->cfg.baudrate = kl5kusb105a_sio_b38400;
			break;
		case B57600: priv->cfg.baudrate = kl5kusb105a_sio_b57600;
			break;
		case B115200: priv->cfg.baudrate = kl5kusb105a_sio_b115200;
			break;
		default:
			err("KLSI USB->Serial converter:"
			    " unsupported baudrate request, using default"
			    " of 9600");
			priv->cfg.baudrate = kl5kusb105a_sio_b9600;
			break;
		}
		if ((cflag & CBAUD) == B0 ) {
			dbg("%s: baud is B0", __FUNCTION__);
			/* Drop RTS and DTR */
			/* maybe this should be simulated by sending read
			 * disable and read enable messages?
			 */
			;
#if 0
			priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
        		mct_u232_set_modem_ctrl(serial, priv->control_state);
#endif
		}
	}

	if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
		/* set the number of data bits */
		switch (cflag & CSIZE) {
		case CS5:
			dbg("%s - 5 bits/byte not supported", __FUNCTION__);
			return ;
		case CS6:
			dbg("%s - 6 bits/byte not supported", __FUNCTION__);
			return ;
		case CS7:
			priv->cfg.databits = kl5kusb105a_dtb_7;
			break;
		case CS8:
			priv->cfg.databits = kl5kusb105a_dtb_8;
			break;
		default:
			err("CSIZE was not CS5-CS8, using default of 8");
			priv->cfg.databits = kl5kusb105a_dtb_8;
			break;
		}
	}

	/*
	 * Update line control register (LCR)
	 */
	if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))
	    || (cflag & CSTOPB) != (old_cflag & CSTOPB) ) {
		
#if 0
		priv->last_lcr = 0;

		/* set the parity */
		if (cflag & PARENB)
			priv->last_lcr |= (cflag & PARODD) ?
				MCT_U232_PARITY_ODD : MCT_U232_PARITY_EVEN;
		else
			priv->last_lcr |= MCT_U232_PARITY_NONE;

		/* set the number of stop bits */
		priv->last_lcr |= (cflag & CSTOPB) ?
			MCT_U232_STOP_BITS_2 : MCT_U232_STOP_BITS_1;

		mct_u232_set_line_ctrl(serial, priv->last_lcr);
#endif
		;
	}
	
	/*
	 * Set flow control: well, I do not really now how to handle DTR/RTS.
	 * Just do what we have seen with SniffUSB on Win98.
	 */
	if( (iflag & IXOFF) != (old_iflag & IXOFF)
	    || (iflag & IXON) != (old_iflag & IXON)
	    ||  (cflag & CRTSCTS) != (old_cflag & CRTSCTS) ) {
		
		/* Drop DTR/RTS if no flow control otherwise assert */
#if 0
		if ((iflag & IXOFF) || (iflag & IXON) || (cflag & CRTSCTS) )
			priv->control_state |= TIOCM_DTR | TIOCM_RTS;
		else
			priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
		mct_u232_set_modem_ctrl(serial, priv->control_state);
#endif
		;
	}

	/* now commit changes to device */
	klsi_105_chg_port_settings(serial, &(priv->cfg));
} /* klsi_105_set_termios */


#if 0
static void mct_u232_break_ctl( struct usb_serial_port *port, int break_state )
{
	struct usb_serial *serial = port->serial;
	struct mct_u232_private *priv = (struct mct_u232_private *)port->private;
	unsigned char lcr = priv->last_lcr;

	dbg("%sstate=%d", __FUNCTION__, break_state);

	if (break_state)
		lcr |= MCT_U232_SET_BREAK;

	mct_u232_set_line_ctrl(serial, lcr);
} /* mct_u232_break_ctl */
#endif

static int klsi_105_ioctl (struct usb_serial_port *port, struct file * file,
			   unsigned int cmd, unsigned long arg)
{
	struct usb_serial *serial = port->serial;
	struct klsi_105_private *priv = (struct klsi_105_private *)port->private;
	int mask;
	
	dbg("%scmd=0x%x", __FUNCTION__, cmd);

	/* Based on code from acm.c and others */
	switch (cmd) {
	case TIOCMGET: {
		int rc;
		unsigned long line_state;
		dbg("%s - TIOCMGET request, just guessing", __FUNCTION__);

		rc = klsi_105_get_line_state(serial, &line_state);
		if (rc < 0) {
			err("Reading line control failed (error = %d)", rc);
			/* better return value? EAGAIN? */
			return -ENOIOCTLCMD;
		} else {
			priv->line_state = line_state;
			dbg("%s - read line state 0x%lx", __FUNCTION__, line_state);
		}
		return put_user(priv->line_state, (unsigned long *) arg); 
	       };

	case TIOCMSET: /* Turns on and off the lines as specified by the mask */
	case TIOCMBIS: /* turns on (Sets) the lines as specified by the mask */
	case TIOCMBIC: /* turns off (Clears) the lines as specified by the mask */
		if (get_user(mask, (unsigned long *) arg))
			return -EFAULT;

		if ((cmd == TIOCMSET) || (mask & TIOCM_RTS)) {
			/* RTS needs set */
			if( ((cmd == TIOCMSET) && (mask & TIOCM_RTS)) ||
			    (cmd == TIOCMBIS) )
				dbg("%s - set RTS not handled", __FUNCTION__);
				/* priv->control_state |=  TIOCM_RTS; */
			else
				dbg("%s - clear RTS not handled", __FUNCTION__);
				/* priv->control_state &= ~TIOCM_RTS; */
		}

		if ((cmd == TIOCMSET) || (mask & TIOCM_DTR)) {
			/* DTR needs set */
			if( ((cmd == TIOCMSET) && (mask & TIOCM_DTR)) ||
			    (cmd == TIOCMBIS) )
				dbg("%s - set DTR not handled", __FUNCTION__);
			/*	priv->control_state |=  TIOCM_DTR; */
			else
				dbg("%s - clear DTR not handled", __FUNCTION__);
				/* priv->control_state &= ~TIOCM_DTR; */
		}
		/*
		mct_u232_set_modem_ctrl(serial, priv->control_state);
		*/
		break;
					
	case TIOCMIWAIT:
		/* wait for any of the 4 modem inputs (DCD,RI,DSR,CTS)*/
		/* TODO */
		dbg("%s - TIOCMIWAIT not handled", __FUNCTION__);
		return -ENOIOCTLCMD;

	case TIOCGICOUNT:
		/* return count of modemline transitions */
		/* TODO */
		dbg("%s - TIOCGICOUNT not handled", __FUNCTION__);
		return -ENOIOCTLCMD;
	case TCGETS: {
	     /* return current info to caller */
	     int retval;

	     dbg("%s - TCGETS data faked/incomplete", __FUNCTION__);

	     retval = verify_area(VERIFY_WRITE, (void *)arg,
				  sizeof(struct termios));

	     if (retval)
			 return(retval);

	     kernel_termios_to_user_termios((struct termios *)arg,  
					    &priv->termios);
	     return(0);
	     }
	case TCSETS: {
		/* set port termios to the one given by the user */
		int retval;

		dbg("%s - TCSETS not handled", __FUNCTION__);

		retval = verify_area(VERIFY_READ, (void *)arg,
				     sizeof(struct termios));

		if (retval)
			    return(retval);

		user_termios_to_kernel_termios(&priv->termios,
					       (struct termios *)arg);
		klsi_105_set_termios(port, &priv->termios);
		return(0);
	     }
	case TCSETSW: {
		/* set port termios and try to wait for completion of last
		 * write operation */
		/* We guess here. If there are not too many write urbs
		 * outstanding, we lie. */
		/* what is the right way to wait here? schedule() ? */
	        /*
		while (klsi_105_chars_in_buffer(port) > (NUM_URBS / 4 ) * URB_TRANSFER_BUFFER_SIZE)
			    schedule();
		 */
		return -ENOIOCTLCMD;
		      }
	default:
		dbg("%s: arg not supported - 0x%04x", __FUNCTION__,cmd);
		return(-ENOIOCTLCMD);
		break;
	}
	return 0;
} /* klsi_105_ioctl */

static void klsi_105_throttle (struct usb_serial_port *port)
{
	dbg("%s - port %d", __FUNCTION__, port->number);
	usb_unlink_urb (port->read_urb);
}

static void klsi_105_unthrottle (struct usb_serial_port *port)
{
	int result;

	dbg("%s - port %d", __FUNCTION__, port->number);

	port->read_urb->dev = port->serial->dev;
	result = usb_submit_urb(port->read_urb);
	if (result)
		err("%s - failed submitting read urb, error %d", __FUNCTION__,
		    result);
}



static int __init klsi_105_init (void)
{
	usb_serial_register (&kl5kusb105d_device);

	info(DRIVER_DESC " " DRIVER_VERSION);
	return 0;
}


static void __exit klsi_105_exit (void)
{
	usb_serial_deregister (&kl5kusb105d_device);
}


module_init (klsi_105_init);
module_exit (klsi_105_exit);

MODULE_AUTHOR( DRIVER_AUTHOR );
MODULE_DESCRIPTION( DRIVER_DESC );
MODULE_LICENSE("GPL"); 


MODULE_PARM(debug, "i");
MODULE_PARM_DESC(debug, "enable extensive debugging messages");
/* FIXME: implement
MODULE_PARM(num_urbs, "i");
MODULE_PARM_DESC(num_urbs, "number of URBs to use in write pool");
*/

/* vim: set sts=8 ts=8 sw=8: */