/**************************************************************************** * include/nuttx/input/max11802.h * * Copyright (C) 2011, 2015 Gregory Nutt. All rights reserved. * Authors: Gregory Nutt * Petteri Aimonen * * 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 #include #include #include #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 writeable 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. * ****************************************************************************/ 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 */