174 lines
6.5 KiB
C
174 lines
6.5 KiB
C
/****************************************************************************
|
|
* drivers/input/max11802.h
|
|
*
|
|
* Copyright (C) 2011-2012, 2014 Gregory Nutt. All rights reserved.
|
|
* Authors: Gregory Nutt <gnutt@nuttx.org>
|
|
* Petteri Aimonen <jpa@nx.mail.kapsi.fi>
|
|
*
|
|
* 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.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/* References:
|
|
* "Low-Power, Ultra-Small Resistive Touch-Screen Controllers
|
|
* with I2C/SPI Interface" Maxim IC, Rev 3, 10/2010
|
|
*/
|
|
|
|
#ifndef __DRIVERS_INPUT_MAX11802_H
|
|
#define __DRIVERS_INPUT_MAX11802_H
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <stdint.h>
|
|
#include <poll.h>
|
|
#include <nuttx/wqueue.h>
|
|
|
|
#include <nuttx/wdog.h>
|
|
#include <nuttx/clock.h>
|
|
#include <nuttx/semaphore.h>
|
|
#include <nuttx/spi/spi.h>
|
|
#include <nuttx/input/max11802.h>
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
/* MAX11802 Interfaces ******************************************************/
|
|
|
|
/* LSB of register addresses specifies read (1) or write (0). */
|
|
|
|
#define MAX11802_CMD_XPOSITION ((0x52 << 1) | 1)
|
|
#define MAX11802_CMD_YPOSITION ((0x54 << 1) | 1)
|
|
#define MAX11802_CMD_MEASUREXY (0x70 << 1)
|
|
#define MAX11802_CMD_MODE_WR (0x0B << 1)
|
|
#define MAX11802_CMD_MODE_RD ((0x0B << 1) | 1)
|
|
#define MAX11802_CMD_AVG_WR (0x03 << 1)
|
|
#define MAX11802_CMD_SAMPLE_WR (0x04 << 1)
|
|
#define MAX11802_CMD_TIMING_WR (0x05 << 1)
|
|
#define MAX11802_CMD_DELAY_WR (0x06 << 1)
|
|
#define MAX11802_CMD_PULL_WR (0x07 << 1)
|
|
|
|
/* Register values to set */
|
|
|
|
#define MAX11802_MODE 0x06
|
|
#define MAX11802_AVG 0x55
|
|
#define MAX11802_SAMPLE 0xAA
|
|
#define MAX11802_TIMING 0x77
|
|
#define MAX11802_DELAY 0x55
|
|
#define MAX11802_PULL 0x33
|
|
|
|
/* Driver support ***********************************************************/
|
|
|
|
/* This format is used to construct the /dev/input[n] device driver path. It
|
|
* defined here so that it will be used consistently in all places.
|
|
*/
|
|
|
|
#define DEV_FORMAT "/dev/input%d"
|
|
#define DEV_NAMELEN 16
|
|
|
|
/* Poll the pen position while the pen is down at this rate (50MS): */
|
|
|
|
#define MAX11802_WDOG_DELAY MSEC2TICK(50)
|
|
|
|
/****************************************************************************
|
|
* Public Types
|
|
****************************************************************************/
|
|
|
|
/* This describes the state of one contact */
|
|
|
|
enum max11802_contact_3
|
|
{
|
|
CONTACT_NONE = 0, /* No contact */
|
|
CONTACT_DOWN, /* First contact */
|
|
CONTACT_MOVE, /* Same contact, possibly different position */
|
|
CONTACT_UP, /* Contact lost */
|
|
};
|
|
|
|
/* This structure describes the results of one MAX11802 sample */
|
|
|
|
struct max11802_sample_s
|
|
{
|
|
uint8_t id; /* Sampled touch point ID */
|
|
uint8_t contact; /* Contact state (see enum ads7843e_contact_e) */
|
|
bool valid; /* True: x,y contain valid, sampled data */
|
|
uint16_t x; /* Measured X position */
|
|
uint16_t y; /* Measured Y position */
|
|
};
|
|
|
|
/* This structure describes the state of one MAX11802 driver instance */
|
|
|
|
struct max11802_dev_s
|
|
{
|
|
#ifdef CONFIG_ADS7843E_MULTIPLE
|
|
FAR struct ads7843e_dev_s *flink; /* Supports a singly linked list of drivers */
|
|
#endif
|
|
uint8_t nwaiters; /* Number of threads waiting for MAX11802 data */
|
|
uint8_t id; /* Current touch point ID */
|
|
volatile bool penchange; /* An unreported event is buffered */
|
|
uint16_t threshx; /* Thresholding X value */
|
|
uint16_t threshy; /* Thresholding Y value */
|
|
sem_t devsem; /* Manages exclusive access to this structure */
|
|
sem_t waitsem; /* Used to wait for the availability of data */
|
|
|
|
FAR struct max11802_config_s *config; /* Board configuration data */
|
|
FAR struct spi_dev_s *spi; /* Saved SPI driver instance */
|
|
struct work_s work; /* Supports the interrupt handling "bottom half" */
|
|
struct max11802_sample_s sample; /* Last sampled touch point data */
|
|
struct wdog_s wdog; /* Poll the position while the pen is down */
|
|
|
|
/* The following is a list if poll structures of threads waiting for
|
|
* driver events. The 'struct pollfd' reference for each open is also
|
|
* retained in the f_priv field of the 'struct file'.
|
|
*/
|
|
|
|
struct pollfd *fds[CONFIG_MAX11802_NPOLLWAITERS];
|
|
};
|
|
|
|
/****************************************************************************
|
|
* Public Function Prototypes
|
|
****************************************************************************/
|
|
|
|
#ifdef __cplusplus
|
|
#define EXTERN extern "C"
|
|
extern "C"
|
|
{
|
|
#else
|
|
#define EXTERN extern
|
|
#endif
|
|
|
|
#undef EXTERN
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* __DRIVERS_INPUT_ADS7843E_H */
|