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diff --git a/nuttx/include/nuttx/input/touchscreen.h b/nuttx/include/nuttx/input/touchscreen.h
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+++ b/nuttx/include/nuttx/input/touchscreen.h
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+/************************************************************************************
+ * include/nuttx/input/touchscreen.h
+ *
+ *   Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************************/
+
+/* The TOUCHSCREEN driver exports a standard character driver interface. By
+ * convention, the touchscreen driver is registers as an input device at
+ * /dev/inputN where N uniquely identifies the driver instance.
+ *
+ * This header file documents the generic interface that all NuttX
+ * touchscreen devices must conform.  It adds standards and conventions on
+ * top of the standard character driver interface.
+ */
+
+#ifndef __INCLUDE_NUTTX_INPUT_TOUCHSCREEN_H
+#define __INCLUDE_NUTTX_INPUT_TOUCHSCREEN_H
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/fs/ioctl.h>
+
+#ifdef CONFIG_INPUT
+
+/************************************************************************************
+ * Pre-Processor Definitions
+ ************************************************************************************/
+/* IOCTL Commands *******************************************************************/
+
+#define TSIOC_SETCALIB       _TSIOC(0x0001)  /* arg: Pointer to int calibration value */
+#define TSIOC_GETCALIB       _TSIOC(0x0002)  /* arg: Pointer to int calibration value */
+#define TSIOC_SETFREQUENCY   _TSIOC(0x0003)  /* arg: Pointer to uint32_t frequency value */
+#define TSIOC_GETFREQUENCY   _TSIOC(0x0004)  /* arg: Pointer to uint32_t frequency value */
+
+/* Specific touchscreen drivers may support additional, device specific ioctal
+ * commands, beginning with this value:
+ */
+
+#define TSIOC_USER           0x0005         /* Lowest, unused TSC ioctl command */
+
+/* These definitions provide the meaning of all of the bits that may be
+ * reported in the struct touch_point_s flags.
+ */
+
+#define TOUCH_DOWN           (1 << 0) /* A new touch contact is established */
+#define TOUCH_MOVE           (1 << 1) /* Movement occurred with previously reported contact */
+#define TOUCH_UP             (1 << 2) /* The touch contact was lost */
+#define TOUCH_ID_VALID       (1 << 3) /* Touch ID is uncertain */
+#define TOUCH_POS_VALID      (1 << 4) /* Hardware provided a valid X/Y position */
+#define TOUCH_PRESSURE_VALID (1 << 5) /* Hardware provided a valid pressure */
+#define TOUCH_SIZE_VALID     (1 << 6) /* Hardware provided a valid H/W contact size */
+
+/************************************************************************************
+ * Public Types
+ ************************************************************************************/
+
+/* This structure contains information about a single touch point.
+ * Positional units are device specific.
+ */
+
+struct touch_point_s
+{
+  uint8_t  id;       /* Unique identifies contact; Same in all reports for the contact */
+  uint8_t  flags;    /* See TOUCH_* definitions above */
+  int16_t  x;        /* X coordinate of the touch point (uncalibrated) */
+  int16_t  y;        /* Y coordinate of the touch point (uncalibrated) */
+  int16_t  h;        /* Height of touch point (uncalibrated) */
+  int16_t  w;        /* Width of touch point (uncalibrated) */
+  uint16_t pressure; /* Touch pressure */
+};
+
+/* The typical touchscreen driver is a read-only, input character device driver.
+ * the driver write() method is not supported and any attempt to open the
+ * driver in any mode other than read-only will fail.
+ *
+ * Data read from the touchscreen device consists only of touch events and
+ * touch sample data.  This is reflected by struct touch_sample_s.  This
+ * structure is returned by either the driver read method.
+ *
+ * On some devices, multiple touchpoints may be supported. So this top level
+ * data structure is a struct touch_sample_s that "contains" a set of touch
+ * points.  Each touch point is managed individually using an ID that identifies
+ * a touch from first contact until the end of the contact.
+ */
+
+struct touch_sample_s
+{
+  int npoints;                   /* The number of touch points in point[] */
+  struct touch_point_s point[1]; /* Actual dimension is npoints */
+};
+#define SIZEOF_TOUCH_SAMPLE_S(n) (sizeof(struct touch_sample_s) + ((n)-1)*sizeof(struct touch_point_s))
+
+/************************************************************************************
+ * Public Function Prototypes
+ ************************************************************************************/
+
+#ifdef __cplusplus
+#define EXTERN extern "C"
+extern "C" {
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Name: arch_tcinitialize
+ *
+ * Description:
+ *   Each board that supports a touchscreen device must provide this function.
+ *   This function is called by application-specific, setup logic to
+ *   configure the touchscreen device.  This function will register the driver
+ *   as /dev/inputN where N is the minor device number.
+ *
+ * Input Parameters:
+ *   minor   - The input device minor number
+ *
+ * Returned Value:
+ *   Zero is returned on success.  Otherwise, a negated errno value is
+ *   returned to indicate the nature of the failure.
+ *
+ ****************************************************************************/
+
+EXTERN int arch_tcinitialize(int minor);
+
+/****************************************************************************
+ * Name: arch_tcuninitialize
+ *
+ * Description:
+ *   Each board that supports a touchscreen device must provide this function.
+ *   This function is called by application-specific, setup logic to
+ *   uninitialize the touchscreen device.
+ *
+ * Input Parameters:
+ *   None
+ *
+ * Returned Value:
+ *   None.
+ *
+ ****************************************************************************/
+
+EXTERN void arch_tcuninitialize(void);
+
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* CONFIG_INPUT */
+#endif /* __INCLUDE_NUTTX_INPUT_TOUCHSCREEN_H */