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/****************************************************************************
* include/nuttx/input/ads7843e.h
*
* Copyright (C) 2011 Gregory Nutt. All rights reserved.
* Authors: Gregory Nutt <gnutt@nuttx.org>
* Diego Sanchez <dsanchez@nx-engineering.com>
*
* References:
* "Touch Screen Controller, ADS7843," Burr-Brown Products from Texas
* Instruments, SBAS090B, September 2000, Revised May 2002"
*
* 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_ADS7843E_H
#define __INCLUDE_NUTTX_INPUT_ADS7843E_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <nuttx/i2c.h>
#if defined(CONFIG_INPUT) && defined(CONFIG_INPUT_ADS7843E)
/****************************************************************************
* Pre-Processor Definitions
****************************************************************************/
/* Configuration ************************************************************/
/* SPI Frequency. Default: 100KHz */
#ifndef CONFIG_ADS7843E_FREQUENCY
# define CONFIG_ADS7843E_FREQUENCY 100000
#endif
/* Maximum number of threads than can be waiting for POLL events */
#ifndef CONFIG_ADS7843E_NPOLLWAITERS
# define CONFIG_ADS7843E_NPOLLWAITERS 2
#endif
#ifndef CONFIG_ADS7843E_SPIMODE
# define CONFIG_ADS7843E_SPIMODE SPIDEV_MODE0
#endif
/* Thresholds */
#ifndef CONFIG_ADS7843E_THRESHX
# define CONFIG_ADS7843E_THRESHX 12
#endif
#ifndef CONFIG_ADS7843E_THRESHY
# define CONFIG_ADS7843E_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 ADS7843E
* driver. This structure provides information about the configuration
* of the TSB2007 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 ads7843e_config_s
{
/* Device characterization */
uint32_t frequency; /* SPI frequency */
/* If multiple ADS7843E devices are supported, then an IRQ number must
* be provided for each so that their interrupts can be distinguished.
*/
#ifndef CONFIG_ADS7843E_MULTIPLE
int irq; /* IRQ number received by interrupt handler. */
#endif
/* 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
* busy - Return the state of the BUSY GPIO input (for debug only)
* pendown - Return the state of the pen down GPIO input
*
* NOTE: The busy() method is not currently used by the driver. The BUSY
* signal is only an informative signal that is raised after a command has
* been send but before the sample data has been obtained.
*/
int (*attach)(FAR struct ads7843e_config_s *state, xcpt_t isr);
void (*enable)(FAR struct ads7843e_config_s *state, bool enable);
void (*clear)(FAR struct ads7843e_config_s *state);
bool (*busy)(FAR struct ads7843e_config_s *state);
bool (*pendown)(FAR struct ads7843e_config_s *state);
};
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
#ifdef __cplusplus
#define EXTERN extern "C"
extern "C" {
#else
#define EXTERN extern
#endif
/****************************************************************************
* Name: ads7843e_register
*
* Description:
* Configure the ADS7843E 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.
*
****************************************************************************/
int ads7843e_register(FAR struct spi_dev_s *spi,
FAR struct ads7843e_config_s *config,
int minor);
#undef EXTERN
#ifdef __cplusplus
}
#endif
#endif /* CONFIG_INPUT && CONFIG_INPUT_ADS7843E */
#endif /* __INCLUDE_NUTTX_INPUT_ADS7843E_H */
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