147 lines
5.3 KiB
C
147 lines
5.3 KiB
C
/****************************************************************************
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* include/nuttx/input/tsc2007.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/* The TSC2007 is an analog interface circuit for a human interface touch
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* screen device. All peripheral functions are controlled through the command
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* byte and onboard state machines.
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*/
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#ifndef __INCLUDE_NUTTX_INPUT_TSC2007_H
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#define __INCLUDE_NUTTX_INPUT_TSC2007_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/i2c/i2c_master.h>
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#if defined(CONFIG_INPUT) && defined(CONFIG_INPUT_TSC2007)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration ************************************************************/
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/* Maximum number of threads than can be waiting for POLL events */
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#ifndef CONFIG_TSC2007_NPOLLWAITERS
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# define CONFIG_TSC2007_NPOLLWAITERS 2
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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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#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 TSC2007
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* driver. This structure provides information about the configuration
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* of the TSB2007 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 writeable 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 tsc2007_config_s
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{
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/* Device characterization */
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uint8_t address; /* 7-bit I2C address (only bits 0-6 used) */
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uint16_t rxplate; /* Calibrated X plate resistance */
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uint32_t frequency; /* I2C frequency */
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/* If multiple TSC2007 devices are supported, then an IRQ number must
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* be provided for each so that their interrupts can be distinguished.
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*/
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#ifndef CONFIG_TSC2007_MULTIPLE
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int irq; /* IRQ number received by interrupt handler. */
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#endif
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/* IRQ/GPIO access callbacks. These operations all hidden behind
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* callbacks to isolate the TSC2007 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 TSC2007 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 tsc2007_config_s *state, xcpt_t isr);
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void (*enable)(FAR struct tsc2007_config_s *state, bool enable);
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void (*clear)(FAR struct tsc2007_config_s *state);
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bool (*pendown)(FAR struct tsc2007_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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{
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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: tsc2007_register
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*
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* Description:
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* Configure the TSC2007 to use the provided I2C 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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* dev - An I2C 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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int tsc2007_register(FAR struct i2c_master_s *dev,
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FAR struct tsc2007_config_s *config, 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_TSC2007 */
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#endif /* __INCLUDE_NUTTX_INPUT_TSC2007_H */
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