Add MAX11802 touchscreeen driver from Petteri Aimonen

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5237 42af7a65-404d-4744-a932-0658087f49c3

2 files changed, 182 insertions, 2 deletions

diff --git a/nuttx/include/nuttx/compiler.h b/nuttx/include/nuttx/compiler.h
index 1e0af4382..bbb23d01d 100644
--- a/nuttx/include/nuttx/compiler.h
+++ b/nuttx/include/nuttx/compiler.h
@@ -87,11 +87,16 @@
 
 # define packed_struct __attribute__ ((packed))
 
-/* GCC does not support the reentrant or naked attributes */
+/* GCC does not support the reentrant attribute */
 
 # define reentrant_function
-# define naked_function
 
+/* The naked attribute informs GCC that the programmer will take care of
+ * the function prolog and epilog.
+ */
+
+# define naked_function __attribute__ ((naked,no_instrument_function))
+ 
 /* The inline_function attribute informs GCC that the function should always
  * be inlined, regardless of the level of optimization.  The noinline_function
  * indicates that the function should never be inlined.
diff --git a/nuttx/include/nuttx/input/max11802.h b/nuttx/include/nuttx/input/max11802.h
new file mode 100644
index 000000000..3d03bdd11
--- /dev/null
+++ b/nuttx/include/nuttx/input/max11802.h
@@ -0,0 +1,175 @@
+/****************************************************************************
+ * include/nuttx/input/max11802.h
+ *
+ *   Copyright (C) 2011 Gregory Nutt. All rights reserved.
+ *   Authors: Gregory Nutt <gnutt@nuttx.org>
+ *            Petteri Aimonen <jpa@nx.mail.kapsi.fi>
+ *
+ * References:
+ *   "Low-Power, Ultra-Small Resistive Touch-Screen Controllers
+ *    with I2C/SPI Interface" Maxim IC, Rev 3, 10/2010
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+#ifndef __INCLUDE_NUTTX_INPUT_MAX11802_H
+#define __INCLUDE_NUTTX_INPUT_MAX11802_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/spi.h>
+#include <stdbool.h>
+#include <nuttx/irq.h>
+
+#if defined(CONFIG_INPUT) && defined(CONFIG_INPUT_MAX11802)
+
+/****************************************************************************
+ * Pre-Processor Definitions
+ ****************************************************************************/
+/* Configuration ************************************************************/
+/* SPI Frequency.  Default:  100KHz */
+
+#ifndef CONFIG_MAX11802_FREQUENCY
+#  define CONFIG_MAX11802_FREQUENCY 100000
+#endif
+
+/* Maximum number of threads than can be waiting for POLL events */
+
+#ifndef CONFIG_MAX11802_NPOLLWAITERS
+#  define CONFIG_MAX11802_NPOLLWAITERS 2
+#endif
+
+#ifndef CONFIG_MAX11802_SPIMODE
+#  define CONFIG_MAX11802_SPIMODE SPIDEV_MODE0
+#endif
+
+/* Thresholds */
+
+#ifndef CONFIG_MAX11802_THRESHX
+#  define CONFIG_MAX11802_THRESHX 12
+#endif
+
+#ifndef CONFIG_MAX11802_THRESHY
+#  define CONFIG_MAX11802_THRESHY 12
+#endif
+
+/* Check for some required settings.  This can save the user a lot of time
+ * in getting the right configuration.
+ */
+
+#ifdef CONFIG_DISABLE_SIGNALS
+#  error "Signals are required.  CONFIG_DISABLE_SIGNALS must not be selected."
+#endif
+
+#ifndef CONFIG_SCHED_WORKQUEUE
+#  error "Work queue support required.  CONFIG_SCHED_WORKQUEUE must be selected."
+#endif
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+/* A reference to a structure of this type must be passed to the MAX11802
+ * driver.  This structure provides information about the configuration
+ * of the MAX11802 and provides some board-specific hooks.
+ *
+ * Memory for this structure is provided by the caller.  It is not copied
+ * by the driver and is presumed to persist while the driver is active. The
+ * memory must be writable because, under certain circumstances, the driver
+ * may modify frequency or X plate resistance values.
+ */
+
+struct max11802_config_s
+{
+  /* Device characterization */
+
+  uint32_t frequency;  /* SPI frequency */
+
+  /* IRQ/GPIO access callbacks.  These operations all hidden behind
+   * callbacks to isolate the MAX11802 driver from differences in GPIO
+   * interrupt handling by varying boards and MCUs.  If possible,
+   * interrupts should be configured on both rising and falling edges
+   * so that contact and loss-of-contact events can be detected.
+   *
+   * attach  - Attach the MAX11802 interrupt handler to the GPIO interrupt
+   * enable  - Enable or disable the GPIO interrupt
+   * clear   - Acknowledge/clear any pending GPIO interrupt
+   * pendown - Return the state of the pen down GPIO input
+   */
+
+  int  (*attach)(FAR struct max11802_config_s *state, xcpt_t isr);
+  void (*enable)(FAR struct max11802_config_s *state, bool enable);
+  void (*clear)(FAR struct max11802_config_s *state);
+  bool (*pendown)(FAR struct max11802_config_s *state);
+};
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#ifdef __cplusplus
+#define EXTERN extern "C"
+extern "C" {
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Name: max11802_register
+ *
+ * Description:
+ *   Configure the MAX11802 to use the provided SPI device instance.  This
+ *   will register the driver as /dev/inputN where N is the minor device
+ *   number
+ *
+ * Input Parameters:
+ *   spi     - An SPI driver instance
+ *   config  - Persistent board configuration data
+ *   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 max11802_register(FAR struct spi_dev_s *spi,
+                             FAR struct max11802_config_s *config,
+                             int minor);
+
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* CONFIG_INPUT && CONFIG_INPUT_MAX11802 */
+#endif /* __INCLUDE_NUTTX_INPUT_MAX11802_H */