176 lines
6.3 KiB
C
176 lines
6.3 KiB
C
/****************************************************************************
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* include/nuttx/input/max11802.h
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*
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* Copyright (C) 2011 Gregory Nutt. All rights reserved.
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* Authors: Gregory Nutt <gnutt@nuttx.org>
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* Petteri Aimonen <jpa@nx.mail.kapsi.fi>
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*
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* References:
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* "Low-Power, Ultra-Small Resistive Touch-Screen Controllers
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* with I2C/SPI Interface" Maxim IC, Rev 3, 10/2010
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __INCLUDE_NUTTX_INPUT_MAX11802_H
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#define __INCLUDE_NUTTX_INPUT_MAX11802_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/spi.h>
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#include <stdbool.h>
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#include <nuttx/irq.h>
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#if defined(CONFIG_INPUT) && defined(CONFIG_INPUT_MAX11802)
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/****************************************************************************
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* Pre-Processor Definitions
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****************************************************************************/
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/* Configuration ************************************************************/
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/* SPI Frequency. Default: 100KHz */
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#ifndef CONFIG_MAX11802_FREQUENCY
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# define CONFIG_MAX11802_FREQUENCY 100000
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#endif
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/* Maximum number of threads than can be waiting for POLL events */
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#ifndef CONFIG_MAX11802_NPOLLWAITERS
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# define CONFIG_MAX11802_NPOLLWAITERS 2
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#endif
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#ifndef CONFIG_MAX11802_SPIMODE
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# define CONFIG_MAX11802_SPIMODE SPIDEV_MODE0
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#endif
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/* Thresholds */
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#ifndef CONFIG_MAX11802_THRESHX
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# define CONFIG_MAX11802_THRESHX 12
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#endif
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#ifndef CONFIG_MAX11802_THRESHY
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# define CONFIG_MAX11802_THRESHY 12
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#endif
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/* Check for some required settings. This can save the user a lot of time
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* in getting the right configuration.
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*/
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#ifdef CONFIG_DISABLE_SIGNALS
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# error "Signals are required. CONFIG_DISABLE_SIGNALS must not be selected."
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#endif
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#ifndef CONFIG_SCHED_WORKQUEUE
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# error "Work queue support required. CONFIG_SCHED_WORKQUEUE must be selected."
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#endif
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* A reference to a structure of this type must be passed to the MAX11802
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* driver. This structure provides information about the configuration
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* of the MAX11802 and provides some board-specific hooks.
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*
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* Memory for this structure is provided by the caller. It is not copied
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* by the driver and is presumed to persist while the driver is active. The
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* memory must be writable because, under certain circumstances, the driver
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* may modify frequency or X plate resistance values.
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*/
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struct max11802_config_s
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{
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/* Device characterization */
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uint32_t frequency; /* SPI frequency */
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/* IRQ/GPIO access callbacks. These operations all hidden behind
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* callbacks to isolate the MAX11802 driver from differences in GPIO
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* interrupt handling by varying boards and MCUs. If possible,
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* interrupts should be configured on both rising and falling edges
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* so that contact and loss-of-contact events can be detected.
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*
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* attach - Attach the MAX11802 interrupt handler to the GPIO interrupt
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* enable - Enable or disable the GPIO interrupt
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* clear - Acknowledge/clear any pending GPIO interrupt
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* pendown - Return the state of the pen down GPIO input
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*/
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int (*attach)(FAR struct max11802_config_s *state, xcpt_t isr);
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void (*enable)(FAR struct max11802_config_s *state, bool enable);
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void (*clear)(FAR struct max11802_config_s *state);
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bool (*pendown)(FAR struct max11802_config_s *state);
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};
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C" {
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Name: max11802_register
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*
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* Description:
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* Configure the MAX11802 to use the provided SPI device instance. This
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* will register the driver as /dev/inputN where N is the minor device
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* number
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*
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* Input Parameters:
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* spi - An SPI driver instance
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* config - Persistent board configuration data
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* minor - The input device minor number
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*
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* Returned Value:
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* Zero is returned on success. Otherwise, a negated errno value is
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* returned to indicate the nature of the failure.
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*
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****************************************************************************/
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EXTERN int max11802_register(FAR struct spi_dev_s *spi,
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FAR struct max11802_config_s *config,
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int minor);
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* CONFIG_INPUT && CONFIG_INPUT_MAX11802 */
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#endif /* __INCLUDE_NUTTX_INPUT_MAX11802_H */
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