158 lines
5.7 KiB
C
158 lines
5.7 KiB
C
/****************************************************************************
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* drivers/input/max11802.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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/* 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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#ifndef __DRIVERS_INPUT_MAX11802_H
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#define __DRIVERS_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 <stdint.h>
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#include <poll.h>
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#include <nuttx/wqueue.h>
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#include <nuttx/wdog.h>
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#include <nuttx/clock.h>
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#include <nuttx/semaphore.h>
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#include <nuttx/spi/spi.h>
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#include <nuttx/input/max11802.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* MAX11802 Interfaces ******************************************************/
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/* LSB of register addresses specifies read (1) or write (0). */
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#define MAX11802_CMD_XPOSITION ((0x52 << 1) | 1)
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#define MAX11802_CMD_YPOSITION ((0x54 << 1) | 1)
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#define MAX11802_CMD_MEASUREXY (0x70 << 1)
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#define MAX11802_CMD_MODE_WR (0x0B << 1)
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#define MAX11802_CMD_MODE_RD ((0x0B << 1) | 1)
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#define MAX11802_CMD_AVG_WR (0x03 << 1)
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#define MAX11802_CMD_SAMPLE_WR (0x04 << 1)
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#define MAX11802_CMD_TIMING_WR (0x05 << 1)
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#define MAX11802_CMD_DELAY_WR (0x06 << 1)
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#define MAX11802_CMD_PULL_WR (0x07 << 1)
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/* Register values to set */
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#define MAX11802_MODE 0x06
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#define MAX11802_AVG 0x55
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#define MAX11802_SAMPLE 0xAA
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#define MAX11802_TIMING 0x77
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#define MAX11802_DELAY 0x55
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#define MAX11802_PULL 0x33
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/* Driver support ***********************************************************/
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/* This format is used to construct the /dev/input[n] device driver path. It
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* defined here so that it will be used consistently in all places.
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*/
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#define DEV_FORMAT "/dev/input%d"
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#define DEV_NAMELEN 16
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/* Poll the pen position while the pen is down at this rate (50MS): */
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#define MAX11802_WDOG_DELAY MSEC2TICK(50)
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* This describes the state of one contact */
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enum max11802_contact_3
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{
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CONTACT_NONE = 0, /* No contact */
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CONTACT_DOWN, /* First contact */
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CONTACT_MOVE, /* Same contact, possibly different position */
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CONTACT_UP, /* Contact lost */
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};
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/* This structure describes the results of one MAX11802 sample */
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struct max11802_sample_s
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{
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uint8_t id; /* Sampled touch point ID */
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uint8_t contact; /* Contact state (see enum ads7843e_contact_e) */
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bool valid; /* True: x,y contain valid, sampled data */
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uint16_t x; /* Measured X position */
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uint16_t y; /* Measured Y position */
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};
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/* This structure describes the state of one MAX11802 driver instance */
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struct max11802_dev_s
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{
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#ifdef CONFIG_ADS7843E_MULTIPLE
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FAR struct ads7843e_dev_s *flink; /* Supports a singly linked list of drivers */
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#endif
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uint8_t nwaiters; /* Number of threads waiting for MAX11802 data */
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uint8_t id; /* Current touch point ID */
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volatile bool penchange; /* An unreported event is buffered */
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uint16_t threshx; /* Thresholding X value */
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uint16_t threshy; /* Thresholding Y value */
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sem_t devsem; /* Manages exclusive access to this structure */
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sem_t waitsem; /* Used to wait for the availability of data */
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FAR struct max11802_config_s *config; /* Board configuration data */
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FAR struct spi_dev_s *spi; /* Saved SPI driver instance */
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struct work_s work; /* Supports the interrupt handling "bottom half" */
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struct max11802_sample_s sample; /* Last sampled touch point data */
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struct wdog_s wdog; /* Poll the position while the pen is down */
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/* The following is a list if poll structures of threads waiting for
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* driver events. The 'struct pollfd' reference for each open is also
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* retained in the f_priv field of the 'struct file'.
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*/
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struct pollfd *fds[CONFIG_MAX11802_NPOLLWAITERS];
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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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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* __DRIVERS_INPUT_ADS7843E_H */
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