| /******************************************************************************************** |
| * drivers/input/max11802.h |
| * |
| * Copyright (C) 2011-2012 Gregory Nutt. All rights reserved. |
| * Authors: Gregory Nutt <gnutt@nuttx.org> |
| * Petteri Aimonen <jpa@nx.mail.kapsi.fi> |
| * |
| * 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 __DRIVERS_INPUT_MAX11802_H |
| #define __DRIVERS_INPUT_MAX11802_H |
| |
| /******************************************************************************************** |
| * Included Files |
| ********************************************************************************************/ |
| |
| #include <nuttx/config.h> |
| |
| #include <stdint.h> |
| #include <semaphore.h> |
| #include <poll.h> |
| #include <wdog.h> |
| #include <nuttx/wqueue.h> |
| |
| #include <nuttx/spi/spi.h> |
| #include <nuttx/clock.h> |
| #include <nuttx/input/max11802.h> |
| |
| /******************************************************************************************** |
| * Pre-Processor Definitions |
| ********************************************************************************************/ |
| /* Configuration ****************************************************************************/ |
| |
| /* 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_TIMING_WR (0x05 << 1) |
| #define MAX11802_CMD_DELAY_WR (0x06 << 1) |
| |
| /* Register values to set */ |
| #define MAX11802_MODE 0x0E |
| #define MAX11802_AVG 0x55 |
| #define MAX11802_TIMING 0x77 |
| #define MAX11802_DELAY 0x55 |
| |
| /* 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 ((50 + (MSEC_PER_TICK-1))/ MSEC_PER_TICK) |
| |
| /******************************************************************************************** |
| * 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 */ |
| WDOG_ID 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'. |
| */ |
| |
| #ifndef CONFIG_DISABLE_POLL |
| struct pollfd *fds[CONFIG_ADS7843E_NPOLLWAITERS]; |
| #endif |
| }; |
| |
| /******************************************************************************************** |
| * 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 */ |