blob: fabf0f00ce950e64123957de5aebbb02dd25dba4 [file] [log] [blame] [edit]
/*
*
* Copyright (c) 2021 metraTec GmbH
* Copyright (c) 2021 Peter Johanson
*
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @file Driver for MPC230xx I2C-based GPIO driver.
*/
#include <errno.h>
#include <zephyr/kernel.h>
#include <zephyr/device.h>
#include <zephyr/sys/byteorder.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/drivers/i2c.h>
#include <zephyr/drivers/gpio/gpio_utils.h>
#include "gpio_mcp23xxx.h"
#define LOG_LEVEL CONFIG_GPIO_LOG_LEVEL
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(gpio_mcp230xx);
static int mcp230xx_read_port_regs(const struct device *dev, uint8_t reg, uint16_t *buf)
{
const struct mcp23xxx_config *config = dev->config;
uint16_t port_data = 0;
int ret;
uint8_t nread = (config->ngpios == 8) ? 1 : 2;
ret = i2c_burst_read_dt(&config->bus.i2c, reg, (uint8_t *)&port_data, nread);
if (ret < 0) {
LOG_ERR("i2c_read failed!");
return ret;
}
*buf = sys_le16_to_cpu(port_data);
return 0;
}
static int mcp230xx_write_port_regs(const struct device *dev, uint8_t reg, uint16_t value)
{
const struct mcp23xxx_config *config = dev->config;
int ret;
uint8_t nwrite = (config->ngpios == 8) ? 2 : 3;
uint8_t buf[3];
buf[0] = reg;
sys_put_le16(value, &buf[1]);
ret = i2c_write_dt(&config->bus.i2c, buf, nwrite);
if (ret < 0) {
LOG_ERR("i2c_write failed!");
return ret;
}
return 0;
}
static int mcp230xx_bus_is_ready(const struct device *dev)
{
const struct mcp23xxx_config *config = dev->config;
if (!device_is_ready(config->bus.i2c.bus)) {
LOG_ERR("I2C bus %s not ready", config->bus.i2c.bus->name);
return -ENODEV;
}
return 0;
}
#define DT_DRV_COMPAT microchip_mcp230xx
#define GPIO_MCP230XX_DEVICE(inst) \
static struct mcp23xxx_drv_data mcp230xx_##inst##_drvdata = { \
/* Default for registers according to datasheet */ \
.reg_cache.iodir = 0xFFFF, .reg_cache.ipol = 0x0, .reg_cache.gpinten = 0x0, \
.reg_cache.defval = 0x0, .reg_cache.intcon = 0x0, .reg_cache.iocon = 0x0, \
.reg_cache.gppu = 0x0, .reg_cache.intf = 0x0, .reg_cache.intcap = 0x0, \
.reg_cache.gpio = 0x0, .reg_cache.olat = 0x0, \
}; \
static const struct mcp23xxx_config mcp230xx_##inst##_config = { \
.config = { \
.port_pin_mask = GPIO_PORT_PIN_MASK_FROM_DT_INST(inst), \
}, \
.bus = { \
.i2c = I2C_DT_SPEC_INST_GET(inst), \
}, \
.gpio_int = GPIO_DT_SPEC_INST_GET_OR(inst, int_gpios, {0}), \
.gpio_reset = GPIO_DT_SPEC_INST_GET_OR(inst, reset_gpios, {0}), \
.ngpios = DT_INST_PROP(inst, ngpios), \
.read_fn = mcp230xx_read_port_regs, \
.write_fn = mcp230xx_write_port_regs, \
.bus_fn = mcp230xx_bus_is_ready, \
}; \
DEVICE_DT_INST_DEFINE(inst, gpio_mcp23xxx_init, NULL, &mcp230xx_##inst##_drvdata, \
&mcp230xx_##inst##_config, POST_KERNEL, \
CONFIG_GPIO_MCP230XX_INIT_PRIORITY, &gpio_mcp23xxx_api_table);
DT_INST_FOREACH_STATUS_OKAY(GPIO_MCP230XX_DEVICE)