Add hooks for the ADS7843E touchscreen controller

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4013 42af7a65-404d-4744-a932-0658087f49c3

2 files changed, 200 insertions, 0 deletions

diff --git a/nuttx/configs/sam3u-ek/src/Makefile b/nuttx/configs/sam3u-ek/src/Makefile
index 2bfa7693e..6c575e2f3 100644
--- a/nuttx/configs/sam3u-ek/src/Makefile
+++ b/nuttx/configs/sam3u-ek/src/Makefile
@@ -50,6 +50,9 @@ endif
 ifeq ($(CONFIG_USBSTRG),y)
 CSRCS		+= up_usbstrg.c
 endif
+ifeq ($(CONFIG_INPUT_ADS7843E),y)
+CSRCS		+= up_touchscreen.c
+endif
 COBJS		= $(CSRCS:.c=$(OBJEXT))
 
 SRCS		= $(ASRCS) $(CSRCS)
diff --git a/nuttx/configs/sam3u-ek/src/up_touchscreen.c b/nuttx/configs/sam3u-ek/src/up_touchscreen.c
new file mode 100755
index 000000000..2d4b2ef18
--- /dev/null
+++ b/nuttx/configs/sam3u-ek/src/up_touchscreen.c
@@ -0,0 +1,197 @@
+/************************************************************************************
+ * configs/sam3u-ek/src/up_touchscreen.c
+ * arch/arm/src/board/up_touchscreen.c
+ *
+ *   Copyright (C) 2011 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.
+ *
+ ************************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <debug.h>
+#include <errno.h>
+
+#include <nuttx/sdio.h>
+#include <nuttx/input/touchscreen.h>
+#include <nuttx/input/ads7843e.h>
+
+#include "sam3u_internal.h"
+#include "sam3uek_internal.h.h"
+
+/****************************************************************************
+ * Pre-Processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Static Function Prototypes
+ ****************************************************************************/
+
+/* IRQ/GPIO access callbacks.  These operations all hidden behind
+ * callbacks to isolate the ADS7843E 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 ADS7843E 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
+ */
+
+static int  tsc_attach(FAR struct ads7843e_config_s *state, xcpt_t isr);
+static void tsc_enable(FAR struct ads7843e_config_s *state, bool enable);
+static void tsc_clear(FAR struct ads7843e_config_s *state);
+static bool tsc_pendown(FAR struct ads7843e_config_s *state);
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/* A reference to a structure of this type must be passed to the ADS7843E
+ * driver.  This structure provides information about the configuration
+ * of the ADS7843E 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.
+ */
+
+static struct ads7843e_config_s g_tscinfo =
+{
+  .calib     = CONFIG_INPUT_TSCCALIB,
+  .frequency = CONFIG_INPUT_TSCFREQUENCY,
+
+  .attach    = tsc_attach,
+  .enable    = tsc_enable,
+  .clear     = tsc_clear,
+  .pendown   = tsc_pendown,
+};
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/* IRQ/GPIO access callbacks.  These operations all hidden behind
+ * callbacks to isolate the ADS7843E 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 ADS7843E 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
+ */
+
+static int tsc_attach(FAR struct ads7843e_config_s *state, xcpt_t isr)
+{
+#warning "Missing logic"
+  return OK;
+}
+
+static void tsc_enable(FAR struct ads7843e_config_s *state, bool enable)
+{
+  /* Attach and enable, or detach and disable */
+
+  if (enable && g_tschandler)
+    {
+      /* Configure and enable the ADS7843E interrupt */
+#warning "Missing logic"
+    }
+  else
+    {
+#warning "Missing logic"
+    }
+}
+
+static void tsc_clear(FAR struct ads7843e_config_s *state)
+{
+  /* Does nothing */
+}
+
+static bool tsc_pendown(FAR struct ads7843e_config_s *state)
+{
+  /* REVISIT:  This might need to be inverted */
+
+  return sam3u_gpioread(GPIO_ADS7843E);
+}
+#endif /* HAVE_TOUCHSCREEN */
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: up_tcinitialize
+ *
+ * Description:
+ *   Initialize the touchscreen device
+ *
+ ****************************************************************************/
+
+int up_tcinitialize(void)
+{
+  FAR struct spi_dev_s *dev;
+  int ret;
+
+  /* Configure and enable the ADS7843E interrupt pin as an input */
+
+  (void)sam3u_configgpio(GPIO_ADS7843E_BUY);
+  (void)sam3u_configgpio(GPIO_ADS7843E_IRQ);
+
+  /* Get an instance of the SPI interface */
+
+  dev = up_spiinitialize(CONFIG_INPUT_TSCSPIDEV);
+  if (!dev)
+    {
+      dbg("Failed to initialize SPI bus %d\n", CONFIG_INPUT_TSCSPIDEV);
+      return -ENODEV;
+    }
+
+  /* Initialize and register the SPI touschscreen device */
+
+  ret = ads7843e_register(dev, &g_tscinfo, CONFIG_INPUT_TSCMINOR);
+  if (ret < 0)
+    {
+      dbg("Failed to initialize SPI bus %d\n", CONFIG_INPUT_TSCSPIDEV);
+      /* up_spiuninitialize(dev); */
+      return -ENODEV;
+    }
+
+  return OK;
+}