nuttx/configs/hymini-stm32v/src/up_ts.c

/************************************************************************************
 * configs/hymini-stm32v/src/up_ts.c
 * arch/arm/src/board/up_ts.c
 *
 *   Copyright (C) 2011 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *           Laurent Latil <laurent@latil.nom.fr>
 *
 * 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.
 *
 ************************************************************************************/

#include <nuttx/config.h>
#include <nuttx/spi/spi.h>
#include <nuttx/arch.h>

#include <errno.h>
#include <debug.h>

#include "stm32.h"
#include "hymini_stm32v-internal.h"

#include <nuttx/input/touchscreen.h>
#include <nuttx/input/ads7843e.h>

#if !defined(CONFIG_STM32_SPI1)
# error CONFIG_STM32_SPI1 must be defined to use the ADS7843 on this board
#endif

static int hymini_ts_irq_attach(FAR struct ads7843e_config_s *state, xcpt_t isr);
static void hymini_ts_irq_enable(FAR struct ads7843e_config_s *state,
    bool enable);
static void hymini_ts_irq_clear(FAR struct ads7843e_config_s *state);
static bool hymini_ts_busy(FAR struct ads7843e_config_s *state);
static bool hymini_ts_pendown(FAR struct ads7843e_config_s *state);

/************************************************************************************
 * Private Data
 ************************************************************************************/

static FAR struct ads7843e_config_s ts_cfg =
{
  .frequency = CONFIG_ADS7843E_FREQUENCY,

  .attach = hymini_ts_irq_attach,
  .enable=hymini_ts_irq_enable,
  .clear=hymini_ts_irq_clear,
  .busy = hymini_ts_busy,
  .pendown=hymini_ts_pendown
};

static xcpt_t tc_isr;

/************************************************************************************
 * Private Functions
 ************************************************************************************/

/* Attach the ADS7843E interrupt handler to the GPIO interrupt */
static int hymini_ts_irq_attach(FAR struct ads7843e_config_s *state, xcpt_t isr)
{
  ivdbg("hymini_ts_irq_attach\n");

  tc_isr = isr;
  stm32_gpiosetevent(GPIO_TS_IRQ, true, true, true, isr);
  return OK;
}

/* Enable or disable the GPIO interrupt */
static void hymini_ts_irq_enable(FAR struct ads7843e_config_s *state,
    bool enable)
{
  illvdbg("%d\n", enable);

  stm32_gpiosetevent(GPIO_TS_IRQ, true, true, true, enable? tc_isr:NULL);
}

/* Acknowledge/clear any pending GPIO interrupt */
static void hymini_ts_irq_clear(FAR struct ads7843e_config_s *state)
{
  // FIXME  Nothing to do ?
}

/* As the busy line is not connected, we just wait a little bit here */
static bool hymini_ts_busy(FAR struct ads7843e_config_s *state)
{
  up_mdelay(50);
  return false;
}

/* Return the state of the pen down GPIO input */
static bool hymini_ts_pendown(FAR struct ads7843e_config_s *state)
{
  bool pin_value = stm32_gpioread(GPIO_TS_IRQ);
  return !pin_value;
}

/****************************************************************************
 * 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.
 *
 ****************************************************************************/

int arch_tcinitialize(int minor)
{
  FAR struct spi_dev_s *dev;

  idbg("minor %d\n", minor);

  dev = up_spiinitialize(1);
  if (!dev)
    {
      idbg("Failed to initialize SPI bus\n");
      return -ENODEV;
    }

  /* Configure the PIO interrupt */

  stm32_configgpio(GPIO_TS_IRQ);

  return ads7843e_register(dev, &ts_cfg, 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.
 *
 ****************************************************************************/

void arch_tcuninitialize(void)
{
  /* FIXME What can/should we do here ? */
}