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incubator-nuttx/drivers/ioexpander/tca64xx.h

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/****************************************************************************
* drivers/ioexpander/tca64xx.h
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/* References:
* "16-bit I2C-bus and SMBus I/O port with interrupt product datasheet",
* Rev. 08 - 22 October 2009, NXP
*/
#ifndef __DRIVERS_IOEXPANDER_TCA64XX_H
#define __DRIVERS_IOEXPANDER_TCA64XX_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <nuttx/wdog.h>
#include <nuttx/clock.h>
#include <nuttx/mutex.h>
#include <nuttx/wqueue.h>
#include <nuttx/ioexpander/ioexpander.h>
#include <nuttx/ioexpander/tca64xx.h>
#include <nuttx/i2c/i2c_master.h>
#include <nuttx/irq.h>
#if defined(CONFIG_IOEXPANDER) && defined(CONFIG_IOEXPANDER_TCA64XX)
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Configuration ************************************************************/
/* Prerequisites:
* CONFIG_I2C
* I2C support is required
* CONFIG_IOEXPANDER
* Enables I/O expander support
*
* CONFIG_IOEXPANDER_TCA64XX
* Enables support for the TCA64XX driver (Needs CONFIG_INPUT)
* CONFIG_TCA64XX_MULTIPLE
* Can be defined to support multiple TCA64XX devices on board.
* CONFIG_TCA64XX_INT_NCALLBACKS
* Maximum number of supported pin interrupt callbacks.
* CONFIG_TCA64XX_INT_POLL
* Enables a poll for missed interrupts
* CONFIG_TCA64XX_INT_POLLDELAY
* If CONFIG_TCA64XX_INT_POLL=y, then this is the delay in microseconds
* between polls for missed interrupts.
*/
#ifndef CONFIG_I2C
# error "CONFIG_I2C is required by TCA64XX"
#endif
#ifdef CONFIG_IOEXPANDER_INT_ENABLE
# ifndef CONFIG_TCA64XX_INT_NCALLBACKS
# define CONFIG_TCA64XX_INT_NCALLBACKS 4
# endif
#endif
#ifdef CONFIG_IOEXPANDER_INT_ENABLE
# ifndef CONFIG_SCHED_WORKQUEUE
# error Work queue support required. CONFIG_SCHED_WORKQUEUE must be selected.
# endif
#endif
#ifndef CONFIG_TCA64XX_INT_POLLDELAY
# define CONFIG_TCA64XX_INT_POLLDELAY 500000
#endif
/* TCA64XX Definitions ******************************************************/
/* I2C frequency */
#define TCA64XX_I2C_MAXFREQUENCY 400000 /* 400KHz */
/* TCA64XX Parts ************************************************************/
#define TCA6408_INPUT_REG 0x00
#define TCA6408_OUTPUT_REG 0x01
#define TCA6408_POLARITY_REG 0x02
#define TCA6408_CONFIG_REG 0x03
#define TCA6408_NR_GPIOS 8
#define TCA6416_INPUT0_REG 0x00
#define TCA6416_INPUT1_REG 0x01
#define TCA6416_OUTPUT0_REG 0x02
#define TCA6416_OUTPUT1_REG 0x03
#define TCA6416_POLARITY0_REG 0x04
#define TCA6416_POLARITY1_REG 0x05
#define TCA6416_CONFIG0_REG 0x06
#define TCA6416_CONFIG1_REG 0x07
#define TCA6416_NR_GPIOS 16
#define TCA6424_INPUT0_REG 0x00
#define TCA6424_INPUT1_REG 0x01
#define TCA6424_INPUT2_REG 0x02
#define TCA6424_OUTPUT0_REG 0x04
#define TCA6424_OUTPUT1_REG 0x05
#define TCA6424_OUTPUT2_REG 0x06
#define TCA6424_POLARITY0_REG 0x08
#define TCA6424_POLARITY1_REG 0x09
#define TCA6424_POLARITY2_REG 0x0A
#define TCA6424_CONFIG0_REG 0x0C
#define TCA6424_CONFIG1_REG 0x0D
#define TCA6424_CONFIG2_REG 0x0E
#define TCA6424_NR_GPIOS 24
#define TCA64XX_NR_GPIO_MAX TCA6424_NR_GPIOS
/* 1us (datasheet: reset pulse duration (Tw) is 4ns */
#define TCA64XX_TW 1
/* 1us (datasheet: time to reset (Treset) is 600ns */
#define TCA64XX_TRESET 1
#define TCA64XX_IRQ_TYPE_EDGE_BOTH 0x00000000
#define TCA64XX_IRQ_TYPE_EDGE_RISING 0x00000001
#define TCA64XX_IRQ_TYPE_EDGE_FALLING 0x00000002
#define TCA64XX_IRQ_TYPE_LEVEL_HIGH 0x00000001
#define TCA64XX_IRQ_TYPE_LEVEL_LOW 0x00000002
#define TCA64XX_IRQ_TYPE_EDGE 0x00000000
#define TCA64XX_IRQ_TYPE_LEVEL 0x00000001
#define TCA64XX_POLLDELAY (CONFIG_TCA64XX_INT_POLLDELAY / USEC_PER_TICK)
#define TCA64_LEVEL_SENSITIVE(d,p) \
(((d)->trigger & ((ioe_pinset_t)1 << (p))) == 0)
#define TCA64_LEVEL_HIGH(d,p) \
(((d)->level[0] & ((ioe_pinset_t)1 << (p))) != 0)
#define TCA64_LEVEL_LOW(d,p) \
(((d)->level[1] & ((ioe_pinset_t)1 << (p))) != 0)
#define TCA64_EDGE_SENSITIVE(d,p) \
(((d)->trigger & ((ioe_pinset_t)1 << (p))) != 0)
#define TCA64_EDGE_RISING(d,p) \
(((d)->level[0] & ((ioe_pinset_t)1 << (p))) != 0)
#define TCA64_EDGE_FALLING(d,p) \
(((d)->level[1] & ((ioe_pinset_t)1 << (p))) != 0)
#define TCA64_EDGE_BOTH(d,p) \
(TCA64_LEVEL_RISING(d,p) && TCA64_LEVEL_FALLING(d,p))
/****************************************************************************
* Public Types
****************************************************************************/
/* This structure represents the configuration of one part */
struct tca64_part_s
{
uint8_t tp_id; /* Part ID (see enum tca64xx_part_e) */
uint8_t tp_ngpios; /* Number of supported GPIOs */
uint8_t tp_input; /* Address of first input register */
uint8_t tp_output; /* Address of first output register */
uint8_t tp_polarity; /* Address of first polarity register */
uint8_t tp_config; /* Address of first configuration register */
};
#ifdef CONFIG_IOEXPANDER_INT_ENABLE
/* This type represents on registered pin interrupt callback */
struct tca64_callback_s
{
ioe_pinset_t pinset; /* Set of pin interrupts that will generate
* the callback. */
ioe_callback_t cbfunc; /* The saved callback function pointer */
FAR void *cbarg; /* Callback argument */
};
#endif
/* This structure represents the state of the TCA64XX driver */
struct tca64_dev_s
{
struct ioexpander_dev_s dev; /* Nested structure to allow casting as public gpio
* expander. */
FAR struct tca64_config_s *config; /* Board configuration data */
FAR struct i2c_master_s *i2c; /* Saved I2C driver instance */
uint8_t part; /* TCA64xx part ID (see enum tca64xx_part_e) */
mutex_t lock; /* Mutual exclusion */
#ifdef CONFIG_IOEXPANDER_INT_ENABLE
#ifdef CONFIG_TCA64XX_INT_POLL
struct wdog_s wdog; /* Timer used to poll for missed interrupts */
#endif
ioe_pinset_t input; /* Last input registers */
ioe_pinset_t intstat; /* Pending interrupts */
ioe_pinset_t trigger; /* Bit encoded: 0=level 1=edge */
ioe_pinset_t level[2]; /* Bit encoded: 01=high/rising, 10 low/falling, 11 both */
struct work_s work; /* Supports the interrupt handling "bottom half" */
/* Saved callback information for each I/O expander client */
struct tca64_callback_s cb[CONFIG_TCA64XX_INT_NCALLBACKS];
#endif
};
#endif /* CONFIG_IOEXPANDER && CONFIG_IOEXPANDER_TCA64XX */
#endif /* __DRIVERS_IOEXPANDER_TCA64XX_H */
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