blob: 864f2e69996c4526727e84c71f8de896823c9309 [file] [log] [blame]
/*
*
* Copyright (c) 2021 metraTec GmbH
* Copyright (c) 2021 Peter Johanson
*
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @file Driver for MPC23Sxx SPI-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/spi.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_mcp23sxx);
static int mcp23sxx_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;
uint8_t addr = MCP23SXX_ADDR | MCP23SXX_READBIT;
uint8_t buffer_tx[4] = { addr, reg, 0, 0 };
uint8_t buffer_rx[4] = { 0 };
const struct spi_buf tx_buf = {
.buf = buffer_tx,
.len = 4,
};
const struct spi_buf_set tx = {
.buffers = &tx_buf,
.count = 1,
};
const struct spi_buf rx_buf = {
.buf = buffer_rx,
.len = 2 + nread,
};
const struct spi_buf_set rx = {
.buffers = &rx_buf,
.count = 1,
};
ret = spi_transceive_dt(&config->bus.spi, &tx, &rx);
if (ret < 0) {
LOG_ERR("spi_transceive FAIL %d\n", ret);
return ret;
}
port_data = ((uint16_t)buffer_rx[3] << 8 | buffer_rx[2]);
*buf = sys_le16_to_cpu(port_data);
return 0;
}
static int mcp23sxx_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) ? 1 : 2;
uint16_t port_data = sys_cpu_to_le16(value);
uint8_t port_a_data = port_data & 0xFF;
uint8_t port_b_data = (port_data >> 8) & 0xFF;
port_data = sys_cpu_to_le16(value);
uint8_t addr = MCP23SXX_ADDR;
uint8_t buffer_tx[4] = { addr, reg, port_a_data, port_b_data };
const struct spi_buf tx_buf[1] = {
{
.buf = buffer_tx,
.len = nwrite + 2,
}
};
const struct spi_buf_set tx = {
.buffers = tx_buf,
.count = ARRAY_SIZE(tx_buf),
};
ret = spi_write_dt(&config->bus.spi, &tx);
if (ret < 0) {
LOG_ERR("spi_write FAIL %d\n", ret);
return ret;
}
return 0;
}
static int mcp23sxx_bus_is_ready(const struct device *dev)
{
const struct mcp23xxx_config *config = dev->config;
if (!spi_is_ready(&config->bus.spi)) {
LOG_ERR("SPI bus %s not ready", config->bus.spi.bus->name);
return -ENODEV;
}
return 0;
}
#define DT_DRV_COMPAT microchip_mcp23sxx
#define GPIO_MCP23SXX_DEVICE(inst) \
static struct mcp23xxx_drv_data mcp23sxx_##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 struct mcp23xxx_config mcp23sxx_##inst##_config = { \
.config = { \
.port_pin_mask = GPIO_PORT_PIN_MASK_FROM_DT_INST(inst), \
}, \
.bus = { \
.spi = SPI_DT_SPEC_INST_GET(inst, \
SPI_OP_MODE_MASTER | SPI_MODE_CPOL | \
SPI_MODE_CPHA | SPI_WORD_SET(8), 0) \
}, \
.ngpios = DT_INST_PROP(inst, ngpios), \
.read_fn = mcp23sxx_read_port_regs, \
.write_fn = mcp23sxx_write_port_regs, \
.bus_fn = mcp23sxx_bus_is_ready \
}; \
DEVICE_DT_INST_DEFINE(inst, gpio_mcp23xxx_init, NULL, &mcp23sxx_##inst##_drvdata, \
&mcp23sxx_##inst##_config, POST_KERNEL, \
CONFIG_GPIO_MCP23SXX_INIT_PRIORITY, &gpio_mcp23xxx_api_table);
DT_INST_FOREACH_STATUS_OKAY(GPIO_MCP23SXX_DEVICE)