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333 lines
10 KiB
333 lines
10 KiB
4 years ago
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/*
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* Copyright (c) 2020 Geanix ApS
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT microchip_mcp23017
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/**
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* @file Driver for MCP23017 SPI-based GPIO driver.
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*/
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#include <errno.h>
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#include <kernel.h>
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#include <device.h>
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#include <init.h>
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#include <sys/byteorder.h>
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#include <drivers/gpio.h>
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#include <drivers/i2c.h>
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#include "gpio_mcp23017.h"
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#define LOG_LEVEL CONFIG_GPIO_LOG_LEVEL
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#include <logging/log.h>
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LOG_MODULE_REGISTER(gpio_mcp23017);
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/**
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* @brief Read both port 0 and port 1 registers of certain register function.
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*
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* Given the register in reg, read the pair of port 0 and port 1.
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*
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* @param dev Device struct of the MCP23017.
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* @param reg Register to read (the PORTA of the pair of registers).
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* @param buf Buffer to read data into.
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*
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* @return 0 if successful, failed otherwise.
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*/
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static int read_port_regs(const struct device *dev, uint8_t reg, uint16_t *buf) {
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const struct mcp23017_config *const config = dev->config;
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struct mcp23017_drv_data *const drv_data = (struct mcp23017_drv_data *const)dev->data;
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int ret;
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uint16_t port_data;
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uint8_t addr = config->slave;
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ret = i2c_burst_read(drv_data->i2c, addr, reg, (uint8_t *)&port_data, sizeof(port_data));
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if (ret) {
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LOG_DBG("i2c_write_read FAIL %d\n", ret);
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return ret;
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}
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*buf = sys_le16_to_cpu(port_data);
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LOG_DBG("MCP23017: Read: REG[0x%X] = 0x%X, REG[0x%X] = 0x%X", reg, (*buf & 0xFF), (reg + 1),
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(*buf >> 8));
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return 0;
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}
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/**
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* @brief Write both port 0 and port 1 registers of certain register function.
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*
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* Given the register in reg, write the pair of port 0 and port 1.
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*
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* @param dev Device struct of the MCP23017.
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* @param reg Register to write into (the PORTA of the pair of registers).
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* @param buf Buffer to write data from.
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*
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* @return 0 if successful, failed otherwise.
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*/
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static int write_port_regs(const struct device *dev, uint8_t reg, uint16_t value) {
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const struct mcp23017_config *const config = dev->config;
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struct mcp23017_drv_data *const drv_data = (struct mcp23017_drv_data *const)dev->data;
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int ret;
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uint16_t port_data;
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LOG_DBG("MCP23017: Write: REG[0x%X] = 0x%X, REG[0x%X] = 0x%X", reg, (value & 0xFF), (reg + 1),
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(value >> 8));
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port_data = sys_cpu_to_le16(value);
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ret = i2c_burst_write(drv_data->i2c, config->slave, reg, (uint8_t *)&port_data,
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sizeof(port_data));
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if (ret) {
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LOG_DBG("i2c_write FAIL %d\n", ret);
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return ret;
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}
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return 0;
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}
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/**
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* @brief Setup the pin direction (input or output)
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*
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* @param dev Device struct of the MCP23017
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* @param pin The pin number
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* @param flags Flags of pin or port
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*
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* @return 0 if successful, failed otherwise
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*/
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static int setup_pin_dir(const struct device *dev, uint32_t pin, int flags) {
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struct mcp23017_drv_data *const drv_data = (struct mcp23017_drv_data *const)dev->data;
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uint16_t *dir = &drv_data->reg_cache.iodir;
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uint16_t *output = &drv_data->reg_cache.gpio;
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int ret;
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if ((flags & GPIO_OUTPUT) != 0U) {
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if ((flags & GPIO_OUTPUT_INIT_HIGH) != 0U) {
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*output |= BIT(pin);
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} else if ((flags & GPIO_OUTPUT_INIT_LOW) != 0U) {
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*output &= ~BIT(pin);
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}
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*dir &= ~BIT(pin);
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} else {
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*dir |= BIT(pin);
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}
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ret = write_port_regs(dev, REG_GPIO_PORTA, *output);
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if (ret != 0) {
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return ret;
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}
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ret = write_port_regs(dev, REG_IODIR_PORTA, *dir);
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return ret;
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}
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/**
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* @brief Setup the pin pull up/pull down status
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*
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* @param dev Device struct of the MCP23017
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* @param pin The pin number
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* @param flags Flags of pin or port
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*
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* @return 0 if successful, failed otherwise
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*/
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static int setup_pin_pullupdown(const struct device *dev, uint32_t pin, int flags) {
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struct mcp23017_drv_data *const drv_data = (struct mcp23017_drv_data *const)dev->data;
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uint16_t port;
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int ret;
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/* Setup pin pull up or pull down */
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port = drv_data->reg_cache.gppu;
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/* pull down == 0, pull up == 1 */
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if ((flags & GPIO_PULL_DOWN) != 0U) {
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return -ENOTSUP;
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}
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WRITE_BIT(port, pin, (flags & GPIO_PULL_UP) != 0U);
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ret = write_port_regs(dev, REG_GPPU_PORTA, port);
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if (ret == 0) {
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drv_data->reg_cache.gppu = port;
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}
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return ret;
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}
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static int mcp23017_config(const struct device *dev, gpio_pin_t pin, gpio_flags_t flags) {
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struct mcp23017_drv_data *const drv_data = (struct mcp23017_drv_data *const)dev->data;
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int ret;
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/* Can't do SPI bus operations from an ISR */
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if (k_is_in_isr()) {
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return -EWOULDBLOCK;
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}
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k_sem_take(&drv_data->lock, K_FOREVER);
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if ((flags & GPIO_OPEN_DRAIN) != 0U) {
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ret = -ENOTSUP;
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goto done;
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};
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ret = setup_pin_dir(dev, pin, flags);
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if (ret) {
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LOG_ERR("MCP23017: error setting pin direction (%d)", ret);
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goto done;
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}
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ret = setup_pin_pullupdown(dev, pin, flags);
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if (ret) {
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LOG_ERR("MCP23017: error setting pin pull up/down (%d)", ret);
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goto done;
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}
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done:
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k_sem_give(&drv_data->lock);
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return ret;
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}
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static int mcp23017_port_get_raw(const struct device *dev, uint32_t *value) {
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struct mcp23017_drv_data *const drv_data = (struct mcp23017_drv_data *const)dev->data;
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uint16_t buf;
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int ret;
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/* Can't do SPI bus operations from an ISR */
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if (k_is_in_isr()) {
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return -EWOULDBLOCK;
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}
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k_sem_take(&drv_data->lock, K_FOREVER);
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ret = read_port_regs(dev, REG_GPIO_PORTA, &buf);
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if (ret != 0) {
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goto done;
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}
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*value = buf;
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done:
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k_sem_give(&drv_data->lock);
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return ret;
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}
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static int mcp23017_port_set_masked_raw(const struct device *dev, uint32_t mask, uint32_t value) {
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struct mcp23017_drv_data *const drv_data = (struct mcp23017_drv_data *const)dev->data;
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uint16_t buf;
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int ret;
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/* Can't do SPI bus operations from an ISR */
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if (k_is_in_isr()) {
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return -EWOULDBLOCK;
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}
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k_sem_take(&drv_data->lock, K_FOREVER);
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buf = drv_data->reg_cache.gpio;
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buf = (buf & ~mask) | (mask & value);
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ret = write_port_regs(dev, REG_GPIO_PORTA, buf);
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if (ret == 0) {
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drv_data->reg_cache.gpio = buf;
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}
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k_sem_give(&drv_data->lock);
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return ret;
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}
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static int mcp23017_port_set_bits_raw(const struct device *dev, uint32_t mask) {
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return mcp23017_port_set_masked_raw(dev, mask, mask);
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}
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static int mcp23017_port_clear_bits_raw(const struct device *dev, uint32_t mask) {
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return mcp23017_port_set_masked_raw(dev, mask, 0);
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}
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static int mcp23017_port_toggle_bits(const struct device *dev, uint32_t mask) {
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struct mcp23017_drv_data *const drv_data = (struct mcp23017_drv_data *const)dev->data;
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uint16_t buf;
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int ret;
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/* Can't do SPI bus operations from an ISR */
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if (k_is_in_isr()) {
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return -EWOULDBLOCK;
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}
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k_sem_take(&drv_data->lock, K_FOREVER);
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buf = drv_data->reg_cache.gpio;
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buf ^= mask;
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ret = write_port_regs(dev, REG_GPIO_PORTA, buf);
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if (ret == 0) {
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drv_data->reg_cache.gpio = buf;
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}
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k_sem_give(&drv_data->lock);
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return ret;
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}
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static int mcp23017_pin_interrupt_configure(const struct device *dev, gpio_pin_t pin,
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enum gpio_int_mode mode, enum gpio_int_trig trig) {
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return -ENOTSUP;
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}
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static const struct gpio_driver_api api_table = {
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.pin_configure = mcp23017_config,
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.port_get_raw = mcp23017_port_get_raw,
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.port_set_masked_raw = mcp23017_port_set_masked_raw,
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.port_set_bits_raw = mcp23017_port_set_bits_raw,
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.port_clear_bits_raw = mcp23017_port_clear_bits_raw,
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.port_toggle_bits = mcp23017_port_toggle_bits,
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.pin_interrupt_configure = mcp23017_pin_interrupt_configure,
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};
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/**
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* @brief Initialization function of MCP23017
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*
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* @param dev Device struct
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* @return 0 if successful, failed otherwise.
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*/
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static int mcp23017_init(const struct device *dev) {
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const struct mcp23017_config *const config = dev->config;
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struct mcp23017_drv_data *const drv_data = (struct mcp23017_drv_data *const)dev->data;
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drv_data->i2c = device_get_binding((char *)config->i2c_dev_name);
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if (!drv_data->i2c) {
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LOG_DBG("Unable to get i2c device");
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return -ENODEV;
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}
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k_sem_init(&drv_data->lock, 1, 1);
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return 0;
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}
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#define MCP23017_INIT(inst) \
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static struct mcp23017_config mcp23017_##inst##_config = { \
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.i2c_dev_name = DT_INST_BUS_LABEL(inst), \
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.slave = DT_INST_REG_ADDR(inst), \
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\
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}; \
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\
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static struct mcp23017_drv_data mcp23017_##inst##_drvdata = { \
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/* Default for registers according to datasheet */ \
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.reg_cache.iodir = 0xFFFF, .reg_cache.ipol = 0x0, .reg_cache.gpinten = 0x0, \
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.reg_cache.defval = 0x0, .reg_cache.intcon = 0x0, .reg_cache.iocon = 0x0, \
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.reg_cache.gppu = 0x0, .reg_cache.intf = 0x0, .reg_cache.intcap = 0x0, \
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.reg_cache.gpio = 0x0, .reg_cache.olat = 0x0, \
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}; \
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\
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/* This has to init after SPI master */ \
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DEVICE_DT_INST_DEFINE(inst, mcp23017_init, device_pm_control_nop, &mcp23017_##inst##_drvdata, \
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&mcp23017_##inst##_config, POST_KERNEL, \
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CONFIG_GPIO_MCP23017_INIT_PRIORITY, &api_table);
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DT_INST_FOREACH_STATUS_OKAY(MCP23017_INIT)
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