kobil_sct.c

linux-2.4.29操作系统的源码

	unsigned char *data = purb->transfer_buffer;
	char *dbg_data;

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

	if (purb->status) {
		dbg("%s - port %d Read int status not zero: %d", __FUNCTION__, port->number, purb->status);
		return;
	}
	
	tty = port->tty; 
	if (purb->actual_length) {
		
		// BEGIN DEBUG
		dbg_data = (unsigned char *) kmalloc((3 *  purb->actual_length + 10) * sizeof(char), GFP_KERNEL);  
		if (! dbg_data) {
			return;
		}
		memset(dbg_data, 0, (3 *  purb->actual_length + 10));
		for (i = 0; i < purb->actual_length; i++) { 
			sprintf(dbg_data +3*i, "%02X ", data[i]); 
		}
		dbg(" <-- %s", dbg_data );
		kfree(dbg_data);
		// END DEBUG

		for (i = 0; i < purb->actual_length; ++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, data[i], 0);
		}
		tty_flip_buffer_push(tty);
	}
}


static void kobil_write_callback( struct urb *purb )
{
}


static int kobil_write (struct usb_serial_port *port, int from_user, 
			const unsigned char *buf, int count)
{
	int length = 0;
	int result = 0;
	int todo = 0;
	struct kobil_private * priv;
	int i;
	char *data;

	if (count == 0) {
		dbg("%s - port %d write request of 0 bytes", __FUNCTION__, port->number);
		return 0;
	}

	priv = (struct kobil_private *) port->private;

	if (count > (KOBIL_BUF_LENGTH - priv->filled)) {
		dbg("%s - port %d Error: write request bigger than buffer size", __FUNCTION__, port->number);
		return -ENOMEM;
	}
	
	// BEGIN DEBUG
	data = (unsigned char *) kmalloc((3 * count + 10) * sizeof(char), GFP_KERNEL);  
	if (! data) {
		return (-1);
	}
	memset(data, 0, (3 * count + 10));
	for (i = 0; i < count; i++) { 
		sprintf(data +3*i, "%02X ", buf[i]); 
	} 
	dbg(" %d --> %s", port->number, data );
	kfree(data);
	// END DEBUG

	// Copy data to buffer
	if (from_user) {
		if (copy_from_user(priv->buf + priv->filled, buf, count)) {
			return -EFAULT;
		}
	} else {
		memcpy (priv->buf + priv->filled, buf, count);
	}

	priv->filled = priv->filled + count;
  

	// only send complete block. TWIN, KAAN SIM and adapter K use the same protocol.
	if ( ((priv->device_type != KOBIL_ADAPTER_B_PRODUCT_ID) && (priv->filled > 2) && (priv->filled >= (priv->buf[1] + 3))) || 
	     ((priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID) && (priv->filled > 3) && (priv->filled >= (priv->buf[2] + 4))) ) {
		
		// stop reading (except TWIN and KAAN SIM)
		if ( (priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID) || (priv->device_type == KOBIL_ADAPTER_K_PRODUCT_ID) ) {
			usb_unlink_urb( port->interrupt_in_urb );
		}
		
		todo = priv->filled - priv->cur_pos;

		while(todo > 0) {
			// max 8 byte in one urb (endpoint size)
			length = (todo < 8) ? todo : 8;
			// copy data to transfer buffer
			memcpy(port->write_urb->transfer_buffer, priv->buf + priv->cur_pos, length );
			
			usb_fill_bulk_urb( port->write_urb,
					   port->serial->dev,
					   usb_sndbulkpipe( port->serial->dev, priv->write_int_endpoint_address),
					   port->write_urb->transfer_buffer,
					   length,
					   kobil_write_callback,
					   port
				);

			priv->cur_pos = priv->cur_pos + length;
			result = usb_submit_urb( port->write_urb );
			dbg("%s - port %d Send write URB returns: %i", __FUNCTION__, port->number, result);
			todo = priv->filled - priv->cur_pos;

			if (todo > 0) {
				//mdelay(16);
				set_current_state(TASK_UNINTERRUPTIBLE);
				schedule_timeout(24 * HZ / 1000);
			}

		} // end while
		
		priv->filled = 0;
		priv->cur_pos = 0;
				
		// start reading (except TWIN and KAAN SIM)
		if ( (priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID) || (priv->device_type == KOBIL_ADAPTER_K_PRODUCT_ID) ) {
			// someone sets the dev to 0 if the close method has been called
			port->interrupt_in_urb->dev = port->serial->dev;
		
			// start reading
			result = usb_submit_urb( port->interrupt_in_urb ); 
			dbg("%s - port %d Send read URB returns: %i", __FUNCTION__, port->number, result);
		}
		
	}
	return count;  
}


static int kobil_write_room (struct usb_serial_port *port)
{
	return 8;
}


static int  kobil_ioctl(struct usb_serial_port *port, struct file *file,
			unsigned int cmd, unsigned long arg)
{
	struct kobil_private * priv;
	int mask;
	int result;
	unsigned short urb_val = 0;
	unsigned char *transfer_buffer;
	int transfer_buffer_length = 8;
	char *settings;

	priv = (struct kobil_private *) port->private;
	if ((priv->device_type == KOBIL_USBTWIN_PRODUCT_ID) || (priv->device_type == KOBIL_KAAN_SIM_PRODUCT_ID)) {
		// This device doesn't support ioctl calls
		return 0;
	}

	switch (cmd) {
	case TCGETS:   // 0x5401
		result = verify_area(VERIFY_WRITE, (void *)arg, sizeof(struct termios));
		if (result) {
			dbg("%s - port %d Error in verify_area", __FUNCTION__, port->number);
			return(result);
		}
		kernel_termios_to_user_termios((struct termios *)arg, &priv->internal_termios);
		return 0;

	case TCSETS:   // 0x5402
		if (! &port->tty->termios) {
			dbg("%s - port %d Error: port->tty->termios is NULL", __FUNCTION__, port->number);
			return -ENOTTY;
		}
		result = verify_area(VERIFY_READ, (void *)arg, sizeof(struct termios));
		if (result) {
			dbg("%s - port %d Error in verify_area", __FUNCTION__, port->number);
			return result;
		}
		user_termios_to_kernel_termios( &priv->internal_termios, (struct termios *)arg);
		
		settings = (unsigned char *) kmalloc(50, GFP_KERNEL);  
		if (! settings) {
			return -ENOBUFS;
		}
		memset(settings, 0, 50);

		switch (priv->internal_termios.c_cflag & CBAUD) {
		case B1200:
			urb_val = SUSBCR_SBR_1200;
			strcat(settings, "1200 ");
			break;
		case B9600:
		default:
			urb_val = SUSBCR_SBR_9600;
			strcat(settings, "9600 ");
			break;
		}

		urb_val |= (priv->internal_termios.c_cflag & CSTOPB) ? SUSBCR_SPASB_2StopBits : SUSBCR_SPASB_1StopBit;
		strcat(settings, (priv->internal_termios.c_cflag & CSTOPB) ? "2 StopBits " : "1 StopBit ");
		
		if (priv->internal_termios.c_cflag & PARENB) {
			if  (priv->internal_termios.c_cflag & PARODD) {
				urb_val |= SUSBCR_SPASB_OddParity;
				strcat(settings, "Odd Parity");
			} else {
				urb_val |= SUSBCR_SPASB_EvenParity;
				strcat(settings, "Even Parity");
			}
		} else {
			urb_val |= SUSBCR_SPASB_NoParity;
			strcat(settings, "No Parity");
		}
		dbg("%s - port %d setting port to: %s", __FUNCTION__, port->number, settings );

		result = usb_control_msg( port->serial->dev, 
					  usb_rcvctrlpipe(port->serial->dev, 0 ), 
					  SUSBCRequest_SetBaudRateParityAndStopBits,
					  USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
					  urb_val,
					  0,
					  settings,
					  0,
					  KOBIL_TIMEOUT
			);
		
		dbg("%s - port %d Send set_baudrate URB returns: %i", __FUNCTION__, port->number, result);
		kfree(settings);
		return 0;
    
	case TCFLSH:   // 0x540B
		result = usb_control_msg( port->serial->dev, 
		 			  usb_rcvctrlpipe(port->serial->dev, 0 ), 
					  SUSBCRequest_Misc,
					  USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
					  SUSBCR_MSC_ResetAllQueues,
					  0,
					  NULL,
					  0,
					  KOBIL_TIMEOUT
			);
		
		dbg("%s - port %d Send reset_all_queues (FLUSH) URB returns: %i", __FUNCTION__, port->number, result);
		return ((result < 0) ? -EFAULT : 0);

	case TIOCMGET: // 0x5415
		// allocate memory for transfer buffer
		transfer_buffer = (unsigned char *) kmalloc(transfer_buffer_length, GFP_KERNEL);  
		if (! transfer_buffer) {
			return -ENOBUFS;
		} else {
			memset(transfer_buffer, 0, transfer_buffer_length);
		}

		result = usb_control_msg( port->serial->dev, 
					  usb_rcvctrlpipe(port->serial->dev, 0 ), 
					  SUSBCRequest_GetStatusLineState,
					  USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_IN,
					  0,
					  0,
					  transfer_buffer,
					  transfer_buffer_length,
					  KOBIL_TIMEOUT
			);
	
		dbg("%s - port %d Send get_status_line_state (TIOCMGET) URB returns: %i. Statusline: %02x", 
		    __FUNCTION__, port->number, result, transfer_buffer[0]);
	
		if ((transfer_buffer[0] & SUSBCR_GSL_DSR) != 0) {
			priv->line_state |= TIOCM_DSR;
		} else {
			priv->line_state &= ~TIOCM_DSR; 
		}
		
		kfree(transfer_buffer);
		return put_user(priv->line_state, (unsigned long *) arg);
		
	case TIOCMSET: // 0x5418
		if (get_user(mask, (unsigned long *) arg)){
			return -EFAULT;
		}
		if (priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID) {
			if ((mask & TIOCM_DTR) != 0){
				dbg("%s - port %d Setting DTR", __FUNCTION__, port->number);
			} else {
				dbg("%s - port %d Clearing DTR", __FUNCTION__, port->number);
			} 
			result = usb_control_msg( port->serial->dev, 
						  usb_rcvctrlpipe(port->serial->dev, 0 ), 
						  SUSBCRequest_SetStatusLinesOrQueues,
						  USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
						  ( ((mask & TIOCM_DTR) != 0) ? SUSBCR_SSL_SETDTR : SUSBCR_SSL_CLRDTR),
						  0,
						  NULL,
						  0,
						  KOBIL_TIMEOUT
				);
			
		} else {
			if ((mask & TIOCM_RTS) != 0){
				dbg("%s - port %d Setting RTS", __FUNCTION__, port->number);
			} else {
				dbg("%s - port %d Clearing RTS", __FUNCTION__, port->number);
			}
			result = usb_control_msg( port->serial->dev, 
						  usb_rcvctrlpipe(port->serial->dev, 0 ), 
						  SUSBCRequest_SetStatusLinesOrQueues,
						  USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
						  (((mask & TIOCM_RTS) != 0) ? SUSBCR_SSL_SETRTS : SUSBCR_SSL_CLRRTS),
						  0,
						  NULL,
						  0,
						  KOBIL_TIMEOUT
				);
		}
		dbg("%s - port %d Send set_status_line (TIOCMSET) URB returns: %i", __FUNCTION__, port->number, result);
		return ((result < 0) ? -EFAULT : 0);
	}
	return 0;
}


static int __init kobil_init (void)
{
	usb_serial_register (&kobil_device);

	info(DRIVER_VERSION " " DRIVER_AUTHOR);
	info(DRIVER_DESC);

	return 0;
}


static void __exit kobil_exit (void)
{
	usb_serial_deregister (&kobil_device);
}

module_init(kobil_init);
module_exit(kobil_exit);

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

MODULE_PARM(debug, "i");
MODULE_PARM_DESC(debug, "Debug enabled or not");